diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/Doxyfile.in | 2681 | ||||
| -rw-r--r-- | doc/README.api | 35 | ||||
| -rw-r--r-- | doc/README.feature-removal-schedule | 180 | ||||
| -rw-r--r-- | doc/coding-style.txt | 336 | ||||
| -rw-r--r-- | doc/spec/frontend-api.txt | 30 | ||||
| -rw-r--r-- | doc/spec/protected-field.txt | 74 | ||||
| -rw-r--r-- | doc/spec/rootless-builds.txt | 177 | ||||
| -rw-r--r-- | doc/spec/triggers.txt | 818 |
8 files changed, 4331 insertions, 0 deletions
diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in new file mode 100644 index 0000000..3faf8a4 --- /dev/null +++ b/doc/Doxyfile.in @@ -0,0 +1,2681 @@ +# Doxyfile 1.9.4 + +# This file describes the settings to be used by the documentation system +# doxygen (www.doxygen.org) for a project. +# +# All text after a double hash (##) is considered a comment and is placed in +# front of the TAG it is preceding. +# +# All text after a single hash (#) is considered a comment and will be ignored. +# The format is: +# TAG = value [value, ...] +# For lists, items can also be appended using: +# TAG += value [value, ...] +# Values that contain spaces should be placed between quotes (\" \"). +# +# Note: +# +# Use doxygen to compare the used configuration file with the template +# configuration file: +# doxygen -x [configFile] +# Use doxygen to compare the used configuration file with the template +# configuration file without replacing the environment variables: +# doxygen -x_noenv [configFile] + +#--------------------------------------------------------------------------- +# Project related configuration options +#--------------------------------------------------------------------------- + +# This tag specifies the encoding used for all characters in the configuration +# file that follow. The default is UTF-8 which is also the encoding used for all +# text before the first occurrence of this tag. Doxygen uses libiconv (or the +# iconv built into libc) for the transcoding. See +# https://www.gnu.org/software/libiconv/ for the list of possible encodings. +# The default value is: UTF-8. + +DOXYFILE_ENCODING = UTF-8 + +# The PROJECT_NAME tag is a single word (or a sequence of words surrounded by +# double-quotes, unless you are using Doxywizard) that should identify the +# project for which the documentation is generated. This name is used in the +# title of most generated pages and in a few other places. +# The default value is: My Project. + +PROJECT_NAME = @PACKAGE@ + +# The PROJECT_NUMBER tag can be used to enter a project or revision number. This +# could be handy for archiving the generated documentation or if some version +# control system is used. + +PROJECT_NUMBER = @VERSION@ + +# Using the PROJECT_BRIEF tag one can provide an optional one line description +# for a project that appears at the top of each page and should give viewer a +# quick idea about the purpose of the project. Keep the description short. + +PROJECT_BRIEF = + +# With the PROJECT_LOGO tag one can specify a logo or an icon that is included +# in the documentation. The maximum height of the logo should not exceed 55 +# pixels and the maximum width should not exceed 200 pixels. Doxygen will copy +# the logo to the output directory. + +PROJECT_LOGO = + +# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path +# into which the generated documentation will be written. If a relative path is +# entered, it will be relative to the location where doxygen was started. If +# left blank the current directory will be used. + +OUTPUT_DIRECTORY = doc/ + +# If the CREATE_SUBDIRS tag is set to YES then doxygen will create up to 4096 +# sub-directories (in 2 levels) under the output directory of each output format +# and will distribute the generated files over these directories. Enabling this +# option can be useful when feeding doxygen a huge amount of source files, where +# putting all generated files in the same directory would otherwise causes +# performance problems for the file system. Adapt CREATE_SUBDIRS_LEVEL to +# control the number of sub-directories. +# The default value is: NO. + +CREATE_SUBDIRS = NO + +# Controls the number of sub-directories that will be created when +# CREATE_SUBDIRS tag is set to YES. Level 0 represents 16 directories, and every +# level increment doubles the number of directories, resulting in 4096 +# directories at level 8 which is the default and also the maximum value. The +# sub-directories are organized in 2 levels, the first level always has a fixed +# number of 16 directories. +# Minimum value: 0, maximum value: 8, default value: 8. +# This tag requires that the tag CREATE_SUBDIRS is set to YES. + +CREATE_SUBDIRS_LEVEL = 8 + +# If the ALLOW_UNICODE_NAMES tag is set to YES, doxygen will allow non-ASCII +# characters to appear in the names of generated files. If set to NO, non-ASCII +# characters will be escaped, for example _xE3_x81_x84 will be used for Unicode +# U+3044. +# The default value is: NO. + +ALLOW_UNICODE_NAMES = NO + +# The OUTPUT_LANGUAGE tag is used to specify the language in which all +# documentation generated by doxygen is written. Doxygen will use this +# information to generate all constant output in the proper language. +# Possible values are: Afrikaans, Arabic, Armenian, Brazilian, Bulgarian, +# Catalan, Chinese, Chinese-Traditional, Croatian, Czech, Danish, Dutch, English +# (United States), Esperanto, Farsi (Persian), Finnish, French, German, Greek, +# Hindi, Hungarian, Indonesian, Italian, Japanese, Japanese-en (Japanese with +# English messages), Korean, Korean-en (Korean with English messages), Latvian, +# Lithuanian, Macedonian, Norwegian, Persian (Farsi), Polish, Portuguese, +# Romanian, Russian, Serbian, Serbian-Cyrillic, Slovak, Slovene, Spanish, +# Swedish, Turkish, Ukrainian and Vietnamese. +# The default value is: English. + +OUTPUT_LANGUAGE = English + +# If the BRIEF_MEMBER_DESC tag is set to YES, doxygen will include brief member +# descriptions after the members that are listed in the file and class +# documentation (similar to Javadoc). Set to NO to disable this. +# The default value is: YES. + +BRIEF_MEMBER_DESC = YES + +# If the REPEAT_BRIEF tag is set to YES, doxygen will prepend the brief +# description of a member or function before the detailed description +# +# Note: If both HIDE_UNDOC_MEMBERS and BRIEF_MEMBER_DESC are set to NO, the +# brief descriptions will be completely suppressed. +# The default value is: YES. + +REPEAT_BRIEF = YES + +# This tag implements a quasi-intelligent brief description abbreviator that is +# used to form the text in various listings. Each string in this list, if found +# as the leading text of the brief description, will be stripped from the text +# and the result, after processing the whole list, is used as the annotated +# text. Otherwise, the brief description is used as-is. If left blank, the +# following values are used ($name is automatically replaced with the name of +# the entity):The $name class, The $name widget, The $name file, is, provides, +# specifies, contains, represents, a, an and the. + +ABBREVIATE_BRIEF = + +# If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then +# doxygen will generate a detailed section even if there is only a brief +# description. +# The default value is: NO. + +ALWAYS_DETAILED_SEC = NO + +# If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all +# inherited members of a class in the documentation of that class as if those +# members were ordinary class members. Constructors, destructors and assignment +# operators of the base classes will not be shown. +# The default value is: NO. + +INLINE_INHERITED_MEMB = NO + +# If the FULL_PATH_NAMES tag is set to YES, doxygen will prepend the full path +# before files name in the file list and in the header files. If set to NO the +# shortest path that makes the file name unique will be used +# The default value is: YES. + +FULL_PATH_NAMES = YES + +# The STRIP_FROM_PATH tag can be used to strip a user-defined part of the path. +# Stripping is only done if one of the specified strings matches the left-hand +# part of the path. The tag can be used to show relative paths in the file list. +# If left blank the directory from which doxygen is run is used as the path to +# strip. +# +# Note that you can specify absolute paths here, but also relative paths, which +# will be relative from the directory where doxygen is started. +# This tag requires that the tag FULL_PATH_NAMES is set to YES. + +STRIP_FROM_PATH = + +# The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the +# path mentioned in the documentation of a class, which tells the reader which +# header file to include in order to use a class. If left blank only the name of +# the header file containing the class definition is used. Otherwise one should +# specify the list of include paths that are normally passed to the compiler +# using the -I flag. + +STRIP_FROM_INC_PATH = + +# If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter (but +# less readable) file names. This can be useful is your file systems doesn't +# support long names like on DOS, Mac, or CD-ROM. +# The default value is: NO. + +SHORT_NAMES = NO + +# If the JAVADOC_AUTOBRIEF tag is set to YES then doxygen will interpret the +# first line (until the first dot) of a Javadoc-style comment as the brief +# description. If set to NO, the Javadoc-style will behave just like regular Qt- +# style comments (thus requiring an explicit @brief command for a brief +# description.) +# The default value is: NO. + +JAVADOC_AUTOBRIEF = YES + +# If the JAVADOC_BANNER tag is set to YES then doxygen will interpret a line +# such as +# /*************** +# as being the beginning of a Javadoc-style comment "banner". If set to NO, the +# Javadoc-style will behave just like regular comments and it will not be +# interpreted by doxygen. +# The default value is: NO. + +JAVADOC_BANNER = NO + +# If the QT_AUTOBRIEF tag is set to YES then doxygen will interpret the first +# line (until the first dot) of a Qt-style comment as the brief description. If +# set to NO, the Qt-style will behave just like regular Qt-style comments (thus +# requiring an explicit \brief command for a brief description.) +# The default value is: NO. + +QT_AUTOBRIEF = NO + +# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make doxygen treat a +# multi-line C++ special comment block (i.e. a block of //! or /// comments) as +# a brief description. This used to be the default behavior. The new default is +# to treat a multi-line C++ comment block as a detailed description. Set this +# tag to YES if you prefer the old behavior instead. +# +# Note that setting this tag to YES also means that rational rose comments are +# not recognized any more. +# The default value is: NO. + +MULTILINE_CPP_IS_BRIEF = NO + +# By default Python docstrings are displayed as preformatted text and doxygen's +# special commands cannot be used. By setting PYTHON_DOCSTRING to NO the +# doxygen's special commands can be used and the contents of the docstring +# documentation blocks is shown as doxygen documentation. +# The default value is: YES. + +PYTHON_DOCSTRING = YES + +# If the INHERIT_DOCS tag is set to YES then an undocumented member inherits the +# documentation from any documented member that it re-implements. +# The default value is: YES. + +INHERIT_DOCS = YES + +# If the SEPARATE_MEMBER_PAGES tag is set to YES then doxygen will produce a new +# page for each member. If set to NO, the documentation of a member will be part +# of the file/class/namespace that contains it. +# The default value is: NO. + +SEPARATE_MEMBER_PAGES = NO + +# The TAB_SIZE tag can be used to set the number of spaces in a tab. Doxygen +# uses this value to replace tabs by spaces in code fragments. +# Minimum value: 1, maximum value: 16, default value: 4. + +TAB_SIZE = 8 + +# This tag can be used to specify a number of aliases that act as commands in +# the documentation. An alias has the form: +# name=value +# For example adding +# "sideeffect=@par Side Effects:^^" +# will allow you to put the command \sideeffect (or @sideeffect) in the +# documentation, which will result in a user-defined paragraph with heading +# "Side Effects:". Note that you cannot put \n's in the value part of an alias +# to insert newlines (in the resulting output). You can put ^^ in the value part +# of an alias to insert a newline as if a physical newline was in the original +# file. When you need a literal { or } or , in the value part of an alias you +# have to escape them by means of a backslash (\), this can lead to conflicts +# with the commands \{ and \} for these it is advised to use the version @{ and +# @} or use a double escape (\\{ and \\}) + +ALIASES = + +# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources +# only. Doxygen will then generate output that is more tailored for C. For +# instance, some of the names that are used will be different. The list of all +# members will be omitted, etc. +# The default value is: NO. + +OPTIMIZE_OUTPUT_FOR_C = YES + +# Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java or +# Python sources only. Doxygen will then generate output that is more tailored +# for that language. For instance, namespaces will be presented as packages, +# qualified scopes will look different, etc. +# The default value is: NO. + +OPTIMIZE_OUTPUT_JAVA = NO + +# Set the OPTIMIZE_FOR_FORTRAN tag to YES if your project consists of Fortran +# sources. Doxygen will then generate output that is tailored for Fortran. +# The default value is: NO. + +OPTIMIZE_FOR_FORTRAN = NO + +# Set the OPTIMIZE_OUTPUT_VHDL tag to YES if your project consists of VHDL +# sources. Doxygen will then generate output that is tailored for VHDL. +# The default value is: NO. + +OPTIMIZE_OUTPUT_VHDL = NO + +# Set the OPTIMIZE_OUTPUT_SLICE tag to YES if your project consists of Slice +# sources only. Doxygen will then generate output that is more tailored for that +# language. For instance, namespaces will be presented as modules, types will be +# separated into more groups, etc. +# The default value is: NO. + +OPTIMIZE_OUTPUT_SLICE = NO + +# Doxygen selects the parser to use depending on the extension of the files it +# parses. With this tag you can assign which parser to use for a given +# extension. Doxygen has a built-in mapping, but you can override or extend it +# using this tag. The format is ext=language, where ext is a file extension, and +# language is one of the parsers supported by doxygen: IDL, Java, JavaScript, +# Csharp (C#), C, C++, Lex, D, PHP, md (Markdown), Objective-C, Python, Slice, +# VHDL, Fortran (fixed format Fortran: FortranFixed, free formatted Fortran: +# FortranFree, unknown formatted Fortran: Fortran. In the later case the parser +# tries to guess whether the code is fixed or free formatted code, this is the +# default for Fortran type files). For instance to make doxygen treat .inc files +# as Fortran files (default is PHP), and .f files as C (default is Fortran), +# use: inc=Fortran f=C. +# +# Note: For files without extension you can use no_extension as a placeholder. +# +# Note that for custom extensions you also need to set FILE_PATTERNS otherwise +# the files are not read by doxygen. When specifying no_extension you should add +# * to the FILE_PATTERNS. +# +# Note see also the list of default file extension mappings. + +EXTENSION_MAPPING = l=C + +# If the MARKDOWN_SUPPORT tag is enabled then doxygen pre-processes all comments +# according to the Markdown format, which allows for more readable +# documentation. See https://daringfireball.net/projects/markdown/ for details. +# The output of markdown processing is further processed by doxygen, so you can +# mix doxygen, HTML, and XML commands with Markdown formatting. Disable only in +# case of backward compatibilities issues. +# The default value is: YES. + +MARKDOWN_SUPPORT = YES + +# When the TOC_INCLUDE_HEADINGS tag is set to a non-zero value, all headings up +# to that level are automatically included in the table of contents, even if +# they do not have an id attribute. +# Note: This feature currently applies only to Markdown headings. +# Minimum value: 0, maximum value: 99, default value: 5. +# This tag requires that the tag MARKDOWN_SUPPORT is set to YES. + +TOC_INCLUDE_HEADINGS = 0 + +# When enabled doxygen tries to link words that correspond to documented +# classes, or namespaces to their corresponding documentation. Such a link can +# be prevented in individual cases by putting a % sign in front of the word or +# globally by setting AUTOLINK_SUPPORT to NO. +# The default value is: YES. + +AUTOLINK_SUPPORT = YES + +# If you use STL classes (i.e. std::string, std::vector, etc.) but do not want +# to include (a tag file for) the STL sources as input, then you should set this +# tag to YES in order to let doxygen match functions declarations and +# definitions whose arguments contain STL classes (e.g. func(std::string); +# versus func(std::string) {}). This also make the inheritance and collaboration +# diagrams that involve STL classes more complete and accurate. +# The default value is: NO. + +BUILTIN_STL_SUPPORT = NO + +# If you use Microsoft's C++/CLI language, you should set this option to YES to +# enable parsing support. +# The default value is: NO. + +CPP_CLI_SUPPORT = NO + +# Set the SIP_SUPPORT tag to YES if your project consists of sip (see: +# https://www.riverbankcomputing.com/software/sip/intro) sources only. Doxygen +# will parse them like normal C++ but will assume all classes use public instead +# of private inheritance when no explicit protection keyword is present. +# The default value is: NO. + +SIP_SUPPORT = NO + +# For Microsoft's IDL there are propget and propput attributes to indicate +# getter and setter methods for a property. Setting this option to YES will make +# doxygen to replace the get and set methods by a property in the documentation. +# This will only work if the methods are indeed getting or setting a simple +# type. If this is not the case, or you want to show the methods anyway, you +# should set this option to NO. +# The default value is: YES. + +IDL_PROPERTY_SUPPORT = YES + +# If member grouping is used in the documentation and the DISTRIBUTE_GROUP_DOC +# tag is set to YES then doxygen will reuse the documentation of the first +# member in the group (if any) for the other members of the group. By default +# all members of a group must be documented explicitly. +# The default value is: NO. + +DISTRIBUTE_GROUP_DOC = NO + +# If one adds a struct or class to a group and this option is enabled, then also +# any nested class or struct is added to the same group. By default this option +# is disabled and one has to add nested compounds explicitly via \ingroup. +# The default value is: NO. + +GROUP_NESTED_COMPOUNDS = NO + +# Set the SUBGROUPING tag to YES to allow class member groups of the same type +# (for instance a group of public functions) to be put as a subgroup of that +# type (e.g. under the Public Functions section). Set it to NO to prevent +# subgrouping. Alternatively, this can be done per class using the +# \nosubgrouping command. +# The default value is: YES. + +SUBGROUPING = YES + +# When the INLINE_GROUPED_CLASSES tag is set to YES, classes, structs and unions +# are shown inside the group in which they are included (e.g. using \ingroup) +# instead of on a separate page (for HTML and Man pages) or section (for LaTeX +# and RTF). +# +# Note that this feature does not work in combination with +# SEPARATE_MEMBER_PAGES. +# The default value is: NO. + +INLINE_GROUPED_CLASSES = NO + +# When the INLINE_SIMPLE_STRUCTS tag is set to YES, structs, classes, and unions +# with only public data fields or simple typedef fields will be shown inline in +# the documentation of the scope in which they are defined (i.e. file, +# namespace, or group documentation), provided this scope is documented. If set +# to NO, structs, classes, and unions are shown on a separate page (for HTML and +# Man pages) or section (for LaTeX and RTF). +# The default value is: NO. + +INLINE_SIMPLE_STRUCTS = NO + +# When TYPEDEF_HIDES_STRUCT tag is enabled, a typedef of a struct, union, or +# enum is documented as struct, union, or enum with the name of the typedef. So +# typedef struct TypeS {} TypeT, will appear in the documentation as a struct +# with name TypeT. When disabled the typedef will appear as a member of a file, +# namespace, or class. And the struct will be named TypeS. This can typically be +# useful for C code in case the coding convention dictates that all compound +# types are typedef'ed and only the typedef is referenced, never the tag name. +# The default value is: NO. + +TYPEDEF_HIDES_STRUCT = NO + +# The size of the symbol lookup cache can be set using LOOKUP_CACHE_SIZE. This +# cache is used to resolve symbols given their name and scope. Since this can be +# an expensive process and often the same symbol appears multiple times in the +# code, doxygen keeps a cache of pre-resolved symbols. If the cache is too small +# doxygen will become slower. If the cache is too large, memory is wasted. The +# cache size is given by this formula: 2^(16+LOOKUP_CACHE_SIZE). The valid range +# is 0..9, the default is 0, corresponding to a cache size of 2^16=65536 +# symbols. At the end of a run doxygen will report the cache usage and suggest +# the optimal cache size from a speed point of view. +# Minimum value: 0, maximum value: 9, default value: 0. + +LOOKUP_CACHE_SIZE = 0 + +# The NUM_PROC_THREADS specifies the number of threads doxygen is allowed to use +# during processing. When set to 0 doxygen will based this on the number of +# cores available in the system. You can set it explicitly to a value larger +# than 0 to get more control over the balance between CPU load and processing +# speed. At this moment only the input processing can be done using multiple +# threads. Since this is still an experimental feature the default is set to 1, +# which effectively disables parallel processing. Please report any issues you +# encounter. Generating dot graphs in parallel is controlled by the +# DOT_NUM_THREADS setting. +# Minimum value: 0, maximum value: 32, default value: 1. + +NUM_PROC_THREADS = 1 + +#--------------------------------------------------------------------------- +# Build related configuration options +#--------------------------------------------------------------------------- + +# If the EXTRACT_ALL tag is set to YES, doxygen will assume all entities in +# documentation are documented, even if no documentation was available. Private +# class members and static file members will be hidden unless the +# EXTRACT_PRIVATE respectively EXTRACT_STATIC tags are set to YES. +# Note: This will also disable the warnings about undocumented members that are +# normally produced when WARNINGS is set to YES. +# The default value is: NO. + +EXTRACT_ALL = @BUILD_DEVEL_DOCS@ + +# If the EXTRACT_PRIVATE tag is set to YES, all private members of a class will +# be included in the documentation. +# The default value is: NO. + +EXTRACT_PRIVATE = NO + +# If the EXTRACT_PRIV_VIRTUAL tag is set to YES, documented private virtual +# methods of a class will be included in the documentation. +# The default value is: NO. + +EXTRACT_PRIV_VIRTUAL = NO + +# If the EXTRACT_PACKAGE tag is set to YES, all members with package or internal +# scope will be included in the documentation. +# The default value is: NO. + +EXTRACT_PACKAGE = NO + +# If the EXTRACT_STATIC tag is set to YES, all static members of a file will be +# included in the documentation. +# The default value is: NO. + +EXTRACT_STATIC = NO + +# If the EXTRACT_LOCAL_CLASSES tag is set to YES, classes (and structs) defined +# locally in source files will be included in the documentation. If set to NO, +# only classes defined in header files are included. Does not have any effect +# for Java sources. +# The default value is: YES. + +EXTRACT_LOCAL_CLASSES = YES + +# This flag is only useful for Objective-C code. If set to YES, local methods, +# which are defined in the implementation section but not in the interface are +# included in the documentation. If set to NO, only methods in the interface are +# included. +# The default value is: NO. + +EXTRACT_LOCAL_METHODS = NO + +# If this flag is set to YES, the members of anonymous namespaces will be +# extracted and appear in the documentation as a namespace called +# 'anonymous_namespace{file}', where file will be replaced with the base name of +# the file that contains the anonymous namespace. By default anonymous namespace +# are hidden. +# The default value is: NO. + +EXTRACT_ANON_NSPACES = NO + +# If this flag is set to YES, the name of an unnamed parameter in a declaration +# will be determined by the corresponding definition. By default unnamed +# parameters remain unnamed in the output. +# The default value is: YES. + +RESOLVE_UNNAMED_PARAMS = YES + +# If the HIDE_UNDOC_MEMBERS tag is set to YES, doxygen will hide all +# undocumented members inside documented classes or files. If set to NO these +# members will be included in the various overviews, but no documentation +# section is generated. This option has no effect if EXTRACT_ALL is enabled. +# The default value is: NO. + +HIDE_UNDOC_MEMBERS = NO + +# If the HIDE_UNDOC_CLASSES tag is set to YES, doxygen will hide all +# undocumented classes that are normally visible in the class hierarchy. If set +# to NO, these classes will be included in the various overviews. This option +# has no effect if EXTRACT_ALL is enabled. +# The default value is: NO. + +HIDE_UNDOC_CLASSES = NO + +# If the HIDE_FRIEND_COMPOUNDS tag is set to YES, doxygen will hide all friend +# declarations. If set to NO, these declarations will be included in the +# documentation. +# The default value is: NO. + +HIDE_FRIEND_COMPOUNDS = NO + +# If the HIDE_IN_BODY_DOCS tag is set to YES, doxygen will hide any +# documentation blocks found inside the body of a function. If set to NO, these +# blocks will be appended to the function's detailed documentation block. +# The default value is: NO. + +HIDE_IN_BODY_DOCS = NO + +# The INTERNAL_DOCS tag determines if documentation that is typed after a +# \internal command is included. If the tag is set to NO then the documentation +# will be excluded. Set it to YES to include the internal documentation. +# The default value is: NO. + +INTERNAL_DOCS = NO + +# With the correct setting of option CASE_SENSE_NAMES doxygen will better be +# able to match the capabilities of the underlying filesystem. In case the +# filesystem is case sensitive (i.e. it supports files in the same directory +# whose names only differ in casing), the option must be set to YES to properly +# deal with such files in case they appear in the input. For filesystems that +# are not case sensitive the option should be set to NO to properly deal with +# output files written for symbols that only differ in casing, such as for two +# classes, one named CLASS and the other named Class, and to also support +# references to files without having to specify the exact matching casing. On +# Windows (including Cygwin) and MacOS, users should typically set this option +# to NO, whereas on Linux or other Unix flavors it should typically be set to +# YES. +# The default value is: system dependent. + +CASE_SENSE_NAMES = YES + +# If the HIDE_SCOPE_NAMES tag is set to NO then doxygen will show members with +# their full class and namespace scopes in the documentation. If set to YES, the +# scope will be hidden. +# The default value is: NO. + +HIDE_SCOPE_NAMES = NO + +# If the HIDE_COMPOUND_REFERENCE tag is set to NO (default) then doxygen will +# append additional text to a page's title, such as Class Reference. If set to +# YES the compound reference will be hidden. +# The default value is: NO. + +HIDE_COMPOUND_REFERENCE= NO + +# If the SHOW_HEADERFILE tag is set to YES then the documentation for a class +# will show which file needs to be included to use the class. +# The default value is: YES. + +SHOW_HEADERFILE = YES + +# If the SHOW_INCLUDE_FILES tag is set to YES then doxygen will put a list of +# the files that are included by a file in the documentation of that file. +# The default value is: YES. + +SHOW_INCLUDE_FILES = YES + +# If the SHOW_GROUPED_MEMB_INC tag is set to YES then Doxygen will add for each +# grouped member an include statement to the documentation, telling the reader +# which file to include in order to use the member. +# The default value is: NO. + +SHOW_GROUPED_MEMB_INC = NO + +# If the FORCE_LOCAL_INCLUDES tag is set to YES then doxygen will list include +# files with double quotes in the documentation rather than with sharp brackets. +# The default value is: NO. + +FORCE_LOCAL_INCLUDES = NO + +# If the INLINE_INFO tag is set to YES then a tag [inline] is inserted in the +# documentation for inline members. +# The default value is: YES. + +INLINE_INFO = YES + +# If the SORT_MEMBER_DOCS tag is set to YES then doxygen will sort the +# (detailed) documentation of file and class members alphabetically by member +# name. If set to NO, the members will appear in declaration order. +# The default value is: YES. + +SORT_MEMBER_DOCS = YES + +# If the SORT_BRIEF_DOCS tag is set to YES then doxygen will sort the brief +# descriptions of file, namespace and class members alphabetically by member +# name. If set to NO, the members will appear in declaration order. Note that +# this will also influence the order of the classes in the class list. +# The default value is: NO. + +SORT_BRIEF_DOCS = NO + +# If the SORT_MEMBERS_CTORS_1ST tag is set to YES then doxygen will sort the +# (brief and detailed) documentation of class members so that constructors and +# destructors are listed first. If set to NO the constructors will appear in the +# respective orders defined by SORT_BRIEF_DOCS and SORT_MEMBER_DOCS. +# Note: If SORT_BRIEF_DOCS is set to NO this option is ignored for sorting brief +# member documentation. +# Note: If SORT_MEMBER_DOCS is set to NO this option is ignored for sorting +# detailed member documentation. +# The default value is: NO. + +SORT_MEMBERS_CTORS_1ST = NO + +# If the SORT_GROUP_NAMES tag is set to YES then doxygen will sort the hierarchy +# of group names into alphabetical order. If set to NO the group names will +# appear in their defined order. +# The default value is: NO. + +SORT_GROUP_NAMES = NO + +# If the SORT_BY_SCOPE_NAME tag is set to YES, the class list will be sorted by +# fully-qualified names, including namespaces. If set to NO, the class list will +# be sorted only by class name, not including the namespace part. +# Note: This option is not very useful if HIDE_SCOPE_NAMES is set to YES. +# Note: This option applies only to the class list, not to the alphabetical +# list. +# The default value is: NO. + +SORT_BY_SCOPE_NAME = NO + +# If the STRICT_PROTO_MATCHING option is enabled and doxygen fails to do proper +# type resolution of all parameters of a function it will reject a match between +# the prototype and the implementation of a member function even if there is +# only one candidate or it is obvious which candidate to choose by doing a +# simple string match. By disabling STRICT_PROTO_MATCHING doxygen will still +# accept a match between prototype and implementation in such cases. +# The default value is: NO. + +STRICT_PROTO_MATCHING = NO + +# The GENERATE_TODOLIST tag can be used to enable (YES) or disable (NO) the todo +# list. This list is created by putting \todo commands in the documentation. +# The default value is: YES. + +GENERATE_TODOLIST = YES + +# The GENERATE_TESTLIST tag can be used to enable (YES) or disable (NO) the test +# list. This list is created by putting \test commands in the documentation. +# The default value is: YES. + +GENERATE_TESTLIST = YES + +# The GENERATE_BUGLIST tag can be used to enable (YES) or disable (NO) the bug +# list. This list is created by putting \bug commands in the documentation. +# The default value is: YES. + +GENERATE_BUGLIST = YES + +# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or disable (NO) +# the deprecated list. This list is created by putting \deprecated commands in +# the documentation. +# The default value is: YES. + +GENERATE_DEPRECATEDLIST= YES + +# The ENABLED_SECTIONS tag can be used to enable conditional documentation +# sections, marked by \if <section_label> ... \endif and \cond <section_label> +# ... \endcond blocks. + +ENABLED_SECTIONS = + +# The MAX_INITIALIZER_LINES tag determines the maximum number of lines that the +# initial value of a variable or macro / define can have for it to appear in the +# documentation. If the initializer consists of more lines than specified here +# it will be hidden. Use a value of 0 to hide initializers completely. The +# appearance of the value of individual variables and macros / defines can be +# controlled using \showinitializer or \hideinitializer command in the +# documentation regardless of this setting. +# Minimum value: 0, maximum value: 10000, default value: 30. + +MAX_INITIALIZER_LINES = 30 + +# Set the SHOW_USED_FILES tag to NO to disable the list of files generated at +# the bottom of the documentation of classes and structs. If set to YES, the +# list will mention the files that were used to generate the documentation. +# The default value is: YES. + +SHOW_USED_FILES = YES + +# Set the SHOW_FILES tag to NO to disable the generation of the Files page. This +# will remove the Files entry from the Quick Index and from the Folder Tree View +# (if specified). +# The default value is: YES. + +SHOW_FILES = YES + +# Set the SHOW_NAMESPACES tag to NO to disable the generation of the Namespaces +# page. This will remove the Namespaces entry from the Quick Index and from the +# Folder Tree View (if specified). +# The default value is: YES. + +SHOW_NAMESPACES = YES + +# The FILE_VERSION_FILTER tag can be used to specify a program or script that +# doxygen should invoke to get the current version for each file (typically from +# the version control system). Doxygen will invoke the program by executing (via +# popen()) the command command input-file, where command is the value of the +# FILE_VERSION_FILTER tag, and input-file is the name of an input file provided +# by doxygen. Whatever the program writes to standard output is used as the file +# version. For an example see the documentation. + +FILE_VERSION_FILTER = "git log -n 1 --pretty=format:%h --" + +# The LAYOUT_FILE tag can be used to specify a layout file which will be parsed +# by doxygen. The layout file controls the global structure of the generated +# output files in an output format independent way. To create the layout file +# that represents doxygen's defaults, run doxygen with the -l option. You can +# optionally specify a file name after the option, if omitted DoxygenLayout.xml +# will be used as the name of the layout file. See also section "Changing the +# layout of pages" for information. +# +# Note that if you run doxygen from a directory containing a file called +# DoxygenLayout.xml, doxygen will parse it automatically even if the LAYOUT_FILE +# tag is left empty. + +LAYOUT_FILE = + +# The CITE_BIB_FILES tag can be used to specify one or more bib files containing +# the reference definitions. This must be a list of .bib files. The .bib +# extension is automatically appended if omitted. This requires the bibtex tool +# to be installed. See also https://en.wikipedia.org/wiki/BibTeX for more info. +# For LaTeX the style of the bibliography can be controlled using +# LATEX_BIB_STYLE. To use this feature you need bibtex and perl available in the +# search path. See also \cite for info how to create references. + +CITE_BIB_FILES = + +#--------------------------------------------------------------------------- +# Configuration options related to warning and progress messages +#--------------------------------------------------------------------------- + +# The QUIET tag can be used to turn on/off the messages that are generated to +# standard output by doxygen. If QUIET is set to YES this implies that the +# messages are off. +# The default value is: NO. + +QUIET = YES + +# The WARNINGS tag can be used to turn on/off the warning messages that are +# generated to standard error (stderr) by doxygen. If WARNINGS is set to YES +# this implies that the warnings are on. +# +# Tip: Turn warnings on while writing the documentation. +# The default value is: YES. + +WARNINGS = YES + +# If the WARN_IF_UNDOCUMENTED tag is set to YES then doxygen will generate +# warnings for undocumented members. If EXTRACT_ALL is set to YES then this flag +# will automatically be disabled. +# The default value is: YES. + +WARN_IF_UNDOCUMENTED = YES + +# If the WARN_IF_DOC_ERROR tag is set to YES, doxygen will generate warnings for +# potential errors in the documentation, such as documenting some parameters in +# a documented function twice, or documenting parameters that don't exist or +# using markup commands wrongly. +# The default value is: YES. + +WARN_IF_DOC_ERROR = YES + +# If WARN_IF_INCOMPLETE_DOC is set to YES, doxygen will warn about incomplete +# function parameter documentation. If set to NO, doxygen will accept that some +# parameters have no documentation without warning. +# The default value is: YES. + +WARN_IF_INCOMPLETE_DOC = YES + +# This WARN_NO_PARAMDOC option can be enabled to get warnings for functions that +# are documented, but have no documentation for their parameters or return +# value. If set to NO, doxygen will only warn about wrong parameter +# documentation, but not about the absence of documentation. If EXTRACT_ALL is +# set to YES then this flag will automatically be disabled. See also +# WARN_IF_INCOMPLETE_DOC +# The default value is: NO. + +WARN_NO_PARAMDOC = NO + +# If the WARN_AS_ERROR tag is set to YES then doxygen will immediately stop when +# a warning is encountered. If the WARN_AS_ERROR tag is set to FAIL_ON_WARNINGS +# then doxygen will continue running as if WARN_AS_ERROR tag is set to NO, but +# at the end of the doxygen process doxygen will return with a non-zero status. +# Possible values are: NO, YES and FAIL_ON_WARNINGS. +# The default value is: NO. + +WARN_AS_ERROR = NO + +# The WARN_FORMAT tag determines the format of the warning messages that doxygen +# can produce. The string should contain the $file, $line, and $text tags, which +# will be replaced by the file and line number from which the warning originated +# and the warning text. Optionally the format may contain $version, which will +# be replaced by the version of the file (if it could be obtained via +# FILE_VERSION_FILTER) +# See also: WARN_LINE_FORMAT +# The default value is: $file:$line: $text. + +WARN_FORMAT = "$file:$line: $text" + +# In the $text part of the WARN_FORMAT command it is possible that a reference +# to a more specific place is given. To make it easier to jump to this place +# (outside of doxygen) the user can define a custom "cut" / "paste" string. +# Example: +# WARN_LINE_FORMAT = "'vi $file +$line'" +# See also: WARN_FORMAT +# The default value is: at line $line of file $file. + +WARN_LINE_FORMAT = "at line $line of file $file" + +# The WARN_LOGFILE tag can be used to specify a file to which warning and error +# messages should be written. If left blank the output is written to standard +# error (stderr). In case the file specified cannot be opened for writing the +# warning and error messages are written to standard error. When as file - is +# specified the warning and error messages are written to standard output +# (stdout). + +WARN_LOGFILE = + +#--------------------------------------------------------------------------- +# Configuration options related to the input files +#--------------------------------------------------------------------------- + +# The INPUT tag is used to specify the files and/or directories that contain +# documented source files. You may enter file names like myfile.cpp or +# directories like /usr/src/myproject. Separate the files or directories with +# spaces. See also FILE_PATTERNS and EXTENSION_MAPPING +# Note: If this tag is empty the current directory is searched. + +INPUT = lib/dpkg \ + src \ + utils + +# This tag can be used to specify the character encoding of the source files +# that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses +# libiconv (or the iconv built into libc) for the transcoding. See the libiconv +# documentation (see: +# https://www.gnu.org/software/libiconv/) for the list of possible encodings. +# The default value is: UTF-8. + +INPUT_ENCODING = UTF-8 + +# If the value of the INPUT tag contains directories, you can use the +# FILE_PATTERNS tag to specify one or more wildcard patterns (like *.cpp and +# *.h) to filter out the source-files in the directories. +# +# Note that for custom extensions or not directly supported extensions you also +# need to set EXTENSION_MAPPING for the extension otherwise the files are not +# read by doxygen. +# +# Note the list of default checked file patterns might differ from the list of +# default file extension mappings. +# +# If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cpp, +# *.c++, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl, *.idl, *.ddl, *.odl, *.h, +# *.hh, *.hxx, *.hpp, *.h++, *.l, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, +# *.inc, *.m, *.markdown, *.md, *.mm, *.dox (to be provided as doxygen C +# comment), *.py, *.pyw, *.f90, *.f95, *.f03, *.f08, *.f18, *.f, *.for, *.vhd, +# *.vhdl, *.ucf, *.qsf and *.ice. + +FILE_PATTERNS = *.c \ + *.h + +# The RECURSIVE tag can be used to specify whether or not subdirectories should +# be searched for input files as well. +# The default value is: NO. + +RECURSIVE = YES + +# The EXCLUDE tag can be used to specify files and/or directories that should be +# excluded from the INPUT source files. This way you can easily exclude a +# subdirectory from a directory tree whose root is specified with the INPUT tag. +# +# Note that relative paths are relative to the directory from which doxygen is +# run. + +EXCLUDE = + +# The EXCLUDE_SYMLINKS tag can be used to select whether or not files or +# directories that are symbolic links (a Unix file system feature) are excluded +# from the input. +# The default value is: NO. + +EXCLUDE_SYMLINKS = NO + +# If the value of the INPUT tag contains directories, you can use the +# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude +# certain files from those directories. +# +# Note that the wildcards are matched against the file with absolute path, so to +# exclude all test directories for example use the pattern */test/* + +EXCLUDE_PATTERNS = */t/* + +# The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names +# (namespaces, classes, functions, etc.) that should be excluded from the +# output. The symbol name can be a fully qualified name, a word, or if the +# wildcard * is used, a substring. Examples: ANamespace, AClass, +# ANamespace::AClass, ANamespace::*Test +# +# Note that the wildcards are matched against the file with absolute path, so to +# exclude all test directories use the pattern */test/* + +EXCLUDE_SYMBOLS = + +# The EXAMPLE_PATH tag can be used to specify one or more files or directories +# that contain example code fragments that are included (see the \include +# command). + +EXAMPLE_PATH = + +# If the value of the EXAMPLE_PATH tag contains directories, you can use the +# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and +# *.h) to filter out the source-files in the directories. If left blank all +# files are included. + +EXAMPLE_PATTERNS = + +# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be +# searched for input files to be used with the \include or \dontinclude commands +# irrespective of the value of the RECURSIVE tag. +# The default value is: NO. + +EXAMPLE_RECURSIVE = NO + +# The IMAGE_PATH tag can be used to specify one or more files or directories +# that contain images that are to be included in the documentation (see the +# \image command). + +IMAGE_PATH = + +# The INPUT_FILTER tag can be used to specify a program that doxygen should +# invoke to filter for each input file. Doxygen will invoke the filter program +# by executing (via popen()) the command: +# +# <filter> <input-file> +# +# where <filter> is the value of the INPUT_FILTER tag, and <input-file> is the +# name of an input file. Doxygen will then use the output that the filter +# program writes to standard output. If FILTER_PATTERNS is specified, this tag +# will be ignored. +# +# Note that the filter must not add or remove lines; it is applied before the +# code is scanned, but not when the output code is generated. If lines are added +# or removed, the anchors will not be placed correctly. +# +# Note that for custom extensions or not directly supported extensions you also +# need to set EXTENSION_MAPPING for the extension otherwise the files are not +# properly processed by doxygen. + +INPUT_FILTER = + +# The FILTER_PATTERNS tag can be used to specify filters on a per file pattern +# basis. Doxygen will compare the file name with each pattern and apply the +# filter if there is a match. The filters are a list of the form: pattern=filter +# (like *.cpp=my_cpp_filter). See INPUT_FILTER for further information on how +# filters are used. If the FILTER_PATTERNS tag is empty or if none of the +# patterns match the file name, INPUT_FILTER is applied. +# +# Note that for custom extensions or not directly supported extensions you also +# need to set EXTENSION_MAPPING for the extension otherwise the files are not +# properly processed by doxygen. + +FILTER_PATTERNS = + +# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using +# INPUT_FILTER) will also be used to filter the input files that are used for +# producing the source files to browse (i.e. when SOURCE_BROWSER is set to YES). +# The default value is: NO. + +FILTER_SOURCE_FILES = NO + +# The FILTER_SOURCE_PATTERNS tag can be used to specify source filters per file +# pattern. A pattern will override the setting for FILTER_PATTERN (if any) and +# it is also possible to disable source filtering for a specific pattern using +# *.ext= (so without naming a filter). +# This tag requires that the tag FILTER_SOURCE_FILES is set to YES. + +FILTER_SOURCE_PATTERNS = + +# If the USE_MDFILE_AS_MAINPAGE tag refers to the name of a markdown file that +# is part of the input, its contents will be placed on the main page +# (index.html). This can be useful if you have a project on for instance GitHub +# and want to reuse the introduction page also for the doxygen output. + +USE_MDFILE_AS_MAINPAGE = + +#--------------------------------------------------------------------------- +# Configuration options related to source browsing +#--------------------------------------------------------------------------- + +# If the SOURCE_BROWSER tag is set to YES then a list of source files will be +# generated. Documented entities will be cross-referenced with these sources. +# +# Note: To get rid of all source code in the generated output, make sure that +# also VERBATIM_HEADERS is set to NO. +# The default value is: NO. + +SOURCE_BROWSER = NO + +# Setting the INLINE_SOURCES tag to YES will include the body of functions, +# classes and enums directly into the documentation. +# The default value is: NO. + +INLINE_SOURCES = NO + +# Setting the STRIP_CODE_COMMENTS tag to YES will instruct doxygen to hide any +# special comment blocks from generated source code fragments. Normal C, C++ and +# Fortran comments will always remain visible. +# The default value is: YES. + +STRIP_CODE_COMMENTS = YES + +# If the REFERENCED_BY_RELATION tag is set to YES then for each documented +# entity all documented functions referencing it will be listed. +# The default value is: NO. + +REFERENCED_BY_RELATION = @BUILD_DEVEL_DOCS@ + +# If the REFERENCES_RELATION tag is set to YES then for each documented function +# all documented entities called/used by that function will be listed. +# The default value is: NO. + +REFERENCES_RELATION = @BUILD_DEVEL_DOCS@ + +# If the REFERENCES_LINK_SOURCE tag is set to YES and SOURCE_BROWSER tag is set +# to YES then the hyperlinks from functions in REFERENCES_RELATION and +# REFERENCED_BY_RELATION lists will link to the source code. Otherwise they will +# link to the documentation. +# The default value is: YES. + +REFERENCES_LINK_SOURCE = YES + +# If SOURCE_TOOLTIPS is enabled (the default) then hovering a hyperlink in the +# source code will show a tooltip with additional information such as prototype, +# brief description and links to the definition and documentation. Since this +# will make the HTML file larger and loading of large files a bit slower, you +# can opt to disable this feature. +# The default value is: YES. +# This tag requires that the tag SOURCE_BROWSER is set to YES. + +SOURCE_TOOLTIPS = YES + +# If the USE_HTAGS tag is set to YES then the references to source code will +# point to the HTML generated by the htags(1) tool instead of doxygen built-in +# source browser. The htags tool is part of GNU's global source tagging system +# (see https://www.gnu.org/software/global/global.html). You will need version +# 4.8.6 or higher. +# +# To use it do the following: +# - Install the latest version of global +# - Enable SOURCE_BROWSER and USE_HTAGS in the configuration file +# - Make sure the INPUT points to the root of the source tree +# - Run doxygen as normal +# +# Doxygen will invoke htags (and that will in turn invoke gtags), so these +# tools must be available from the command line (i.e. in the search path). +# +# The result: instead of the source browser generated by doxygen, the links to +# source code will now point to the output of htags. +# The default value is: NO. +# This tag requires that the tag SOURCE_BROWSER is set to YES. + +USE_HTAGS = NO + +# If the VERBATIM_HEADERS tag is set the YES then doxygen will generate a +# verbatim copy of the header file for each class for which an include is +# specified. Set to NO to disable this. +# See also: Section \class. +# The default value is: YES. + +VERBATIM_HEADERS = YES + +# If the CLANG_ASSISTED_PARSING tag is set to YES then doxygen will use the +# clang parser (see: +# http://clang.llvm.org/) for more accurate parsing at the cost of reduced +# performance. This can be particularly helpful with template rich C++ code for +# which doxygen's built-in parser lacks the necessary type information. +# Note: The availability of this option depends on whether or not doxygen was +# generated with the -Duse_libclang=ON option for CMake. +# The default value is: NO. + +CLANG_ASSISTED_PARSING = NO + +# If the CLANG_ASSISTED_PARSING tag is set to YES and the CLANG_ADD_INC_PATHS +# tag is set to YES then doxygen will add the directory of each input to the +# include path. +# The default value is: YES. +# This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES. + +CLANG_ADD_INC_PATHS = YES + +# If clang assisted parsing is enabled you can provide the compiler with command +# line options that you would normally use when invoking the compiler. Note that +# the include paths will already be set by doxygen for the files and directories +# specified with INPUT and INCLUDE_PATH. +# This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES. + +CLANG_OPTIONS = + +# If clang assisted parsing is enabled you can provide the clang parser with the +# path to the directory containing a file called compile_commands.json. This +# file is the compilation database (see: +# http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html) containing the +# options used when the source files were built. This is equivalent to +# specifying the -p option to a clang tool, such as clang-check. These options +# will then be passed to the parser. Any options specified with CLANG_OPTIONS +# will be added as well. +# Note: The availability of this option depends on whether or not doxygen was +# generated with the -Duse_libclang=ON option for CMake. + +CLANG_DATABASE_PATH = + +#--------------------------------------------------------------------------- +# Configuration options related to the alphabetical class index +#--------------------------------------------------------------------------- + +# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index of all +# compounds will be generated. Enable this if the project contains a lot of +# classes, structs, unions or interfaces. +# The default value is: YES. + +ALPHABETICAL_INDEX = NO + +# In case all classes in a project start with a common prefix, all classes will +# be put under the same header in the alphabetical index. The IGNORE_PREFIX tag +# can be used to specify a prefix (or a list of prefixes) that should be ignored +# while generating the index headers. +# This tag requires that the tag ALPHABETICAL_INDEX is set to YES. + +IGNORE_PREFIX = + +#--------------------------------------------------------------------------- +# Configuration options related to the HTML output +#--------------------------------------------------------------------------- + +# If the GENERATE_HTML tag is set to YES, doxygen will generate HTML output +# The default value is: YES. + +GENERATE_HTML = YES + +# The HTML_OUTPUT tag is used to specify where the HTML docs will be put. If a +# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of +# it. +# The default directory is: html. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_OUTPUT = html + +# The HTML_FILE_EXTENSION tag can be used to specify the file extension for each +# generated HTML page (for example: .htm, .php, .asp). +# The default value is: .html. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_FILE_EXTENSION = .html + +# The HTML_HEADER tag can be used to specify a user-defined HTML header file for +# each generated HTML page. If the tag is left blank doxygen will generate a +# standard header. +# +# To get valid HTML the header file that includes any scripts and style sheets +# that doxygen needs, which is dependent on the configuration options used (e.g. +# the setting GENERATE_TREEVIEW). It is highly recommended to start with a +# default header using +# doxygen -w html new_header.html new_footer.html new_stylesheet.css +# YourConfigFile +# and then modify the file new_header.html. See also section "Doxygen usage" +# for information on how to generate the default header that doxygen normally +# uses. +# Note: The header is subject to change so you typically have to regenerate the +# default header when upgrading to a newer version of doxygen. For a description +# of the possible markers and block names see the documentation. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_HEADER = + +# The HTML_FOOTER tag can be used to specify a user-defined HTML footer for each +# generated HTML page. If the tag is left blank doxygen will generate a standard +# footer. See HTML_HEADER for more information on how to generate a default +# footer and what special commands can be used inside the footer. See also +# section "Doxygen usage" for information on how to generate the default footer +# that doxygen normally uses. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_FOOTER = + +# The HTML_STYLESHEET tag can be used to specify a user-defined cascading style +# sheet that is used by each HTML page. It can be used to fine-tune the look of +# the HTML output. If left blank doxygen will generate a default style sheet. +# See also section "Doxygen usage" for information on how to generate the style +# sheet that doxygen normally uses. +# Note: It is recommended to use HTML_EXTRA_STYLESHEET instead of this tag, as +# it is more robust and this tag (HTML_STYLESHEET) will in the future become +# obsolete. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_STYLESHEET = + +# The HTML_EXTRA_STYLESHEET tag can be used to specify additional user-defined +# cascading style sheets that are included after the standard style sheets +# created by doxygen. Using this option one can overrule certain style aspects. +# This is preferred over using HTML_STYLESHEET since it does not replace the +# standard style sheet and is therefore more robust against future updates. +# Doxygen will copy the style sheet files to the output directory. +# Note: The order of the extra style sheet files is of importance (e.g. the last +# style sheet in the list overrules the setting of the previous ones in the +# list). For an example see the documentation. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_EXTRA_STYLESHEET = + +# The HTML_EXTRA_FILES tag can be used to specify one or more extra images or +# other source files which should be copied to the HTML output directory. Note +# that these files will be copied to the base HTML output directory. Use the +# $relpath^ marker in the HTML_HEADER and/or HTML_FOOTER files to load these +# files. In the HTML_STYLESHEET file, use the file name only. Also note that the +# files will be copied as-is; there are no commands or markers available. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_EXTRA_FILES = + +# The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen +# will adjust the colors in the style sheet and background images according to +# this color. Hue is specified as an angle on a color-wheel, see +# https://en.wikipedia.org/wiki/Hue for more information. For instance the value +# 0 represents red, 60 is yellow, 120 is green, 180 is cyan, 240 is blue, 300 +# purple, and 360 is red again. +# Minimum value: 0, maximum value: 359, default value: 220. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_COLORSTYLE_HUE = 220 + +# The HTML_COLORSTYLE_SAT tag controls the purity (or saturation) of the colors +# in the HTML output. For a value of 0 the output will use gray-scales only. A +# value of 255 will produce the most vivid colors. +# Minimum value: 0, maximum value: 255, default value: 100. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_COLORSTYLE_SAT = 100 + +# The HTML_COLORSTYLE_GAMMA tag controls the gamma correction applied to the +# luminance component of the colors in the HTML output. Values below 100 +# gradually make the output lighter, whereas values above 100 make the output +# darker. The value divided by 100 is the actual gamma applied, so 80 represents +# a gamma of 0.8, The value 220 represents a gamma of 2.2, and 100 does not +# change the gamma. +# Minimum value: 40, maximum value: 240, default value: 80. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_COLORSTYLE_GAMMA = 80 + +# If the HTML_TIMESTAMP tag is set to YES then the footer of each generated HTML +# page will contain the date and time when the page was generated. Setting this +# to YES can help to show when doxygen was last run and thus if the +# documentation is up to date. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_TIMESTAMP = NO + +# If the HTML_DYNAMIC_MENUS tag is set to YES then the generated HTML +# documentation will contain a main index with vertical navigation menus that +# are dynamically created via JavaScript. If disabled, the navigation index will +# consists of multiple levels of tabs that are statically embedded in every HTML +# page. Disable this option to support browsers that do not have JavaScript, +# like the Qt help browser. +# The default value is: YES. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_DYNAMIC_MENUS = YES + +# If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML +# documentation will contain sections that can be hidden and shown after the +# page has loaded. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_DYNAMIC_SECTIONS = NO + +# With HTML_INDEX_NUM_ENTRIES one can control the preferred number of entries +# shown in the various tree structured indices initially; the user can expand +# and collapse entries dynamically later on. Doxygen will expand the tree to +# such a level that at most the specified number of entries are visible (unless +# a fully collapsed tree already exceeds this amount). So setting the number of +# entries 1 will produce a full collapsed tree by default. 0 is a special value +# representing an infinite number of entries and will result in a full expanded +# tree by default. +# Minimum value: 0, maximum value: 9999, default value: 100. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_INDEX_NUM_ENTRIES = 100 + +# If the GENERATE_DOCSET tag is set to YES, additional index files will be +# generated that can be used as input for Apple's Xcode 3 integrated development +# environment (see: +# https://developer.apple.com/xcode/), introduced with OSX 10.5 (Leopard). To +# create a documentation set, doxygen will generate a Makefile in the HTML +# output directory. Running make will produce the docset in that directory and +# running make install will install the docset in +# ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find it at +# startup. See https://developer.apple.com/library/archive/featuredarticles/Doxy +# genXcode/_index.html for more information. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +GENERATE_DOCSET = NO + +# This tag determines the name of the docset feed. A documentation feed provides +# an umbrella under which multiple documentation sets from a single provider +# (such as a company or product suite) can be grouped. +# The default value is: Doxygen generated docs. +# This tag requires that the tag GENERATE_DOCSET is set to YES. + +DOCSET_FEEDNAME = "Doxygen generated docs" + +# This tag determines the URL of the docset feed. A documentation feed provides +# an umbrella under which multiple documentation sets from a single provider +# (such as a company or product suite) can be grouped. +# This tag requires that the tag GENERATE_DOCSET is set to YES. + +DOCSET_FEEDURL = + +# This tag specifies a string that should uniquely identify the documentation +# set bundle. This should be a reverse domain-name style string, e.g. +# com.mycompany.MyDocSet. Doxygen will append .docset to the name. +# The default value is: org.doxygen.Project. +# This tag requires that the tag GENERATE_DOCSET is set to YES. + +DOCSET_BUNDLE_ID = org.doxygen.Project + +# The DOCSET_PUBLISHER_ID tag specifies a string that should uniquely identify +# the documentation publisher. This should be a reverse domain-name style +# string, e.g. com.mycompany.MyDocSet.documentation. +# The default value is: org.doxygen.Publisher. +# This tag requires that the tag GENERATE_DOCSET is set to YES. + +DOCSET_PUBLISHER_ID = org.doxygen.Publisher + +# The DOCSET_PUBLISHER_NAME tag identifies the documentation publisher. +# The default value is: Publisher. +# This tag requires that the tag GENERATE_DOCSET is set to YES. + +DOCSET_PUBLISHER_NAME = Publisher + +# If the GENERATE_HTMLHELP tag is set to YES then doxygen generates three +# additional HTML index files: index.hhp, index.hhc, and index.hhk. The +# index.hhp is a project file that can be read by Microsoft's HTML Help Workshop +# on Windows. In the beginning of 2021 Microsoft took the original page, with +# a.o. the download links, offline the HTML help workshop was already many years +# in maintenance mode). You can download the HTML help workshop from the web +# archives at Installation executable (see: +# http://web.archive.org/web/20160201063255/http://download.microsoft.com/downlo +# ad/0/A/9/0A939EF6-E31C-430F-A3DF-DFAE7960D564/htmlhelp.exe). +# +# The HTML Help Workshop contains a compiler that can convert all HTML output +# generated by doxygen into a single compiled HTML file (.chm). Compiled HTML +# files are now used as the Windows 98 help format, and will replace the old +# Windows help format (.hlp) on all Windows platforms in the future. Compressed +# HTML files also contain an index, a table of contents, and you can search for +# words in the documentation. The HTML workshop also contains a viewer for +# compressed HTML files. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +GENERATE_HTMLHELP = NO + +# The CHM_FILE tag can be used to specify the file name of the resulting .chm +# file. You can add a path in front of the file if the result should not be +# written to the html output directory. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +CHM_FILE = + +# The HHC_LOCATION tag can be used to specify the location (absolute path +# including file name) of the HTML help compiler (hhc.exe). If non-empty, +# doxygen will try to run the HTML help compiler on the generated index.hhp. +# The file has to be specified with full path. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +HHC_LOCATION = + +# The GENERATE_CHI flag controls if a separate .chi index file is generated +# (YES) or that it should be included in the main .chm file (NO). +# The default value is: NO. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +GENERATE_CHI = NO + +# The CHM_INDEX_ENCODING is used to encode HtmlHelp index (hhk), content (hhc) +# and project file content. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +CHM_INDEX_ENCODING = + +# The BINARY_TOC flag controls whether a binary table of contents is generated +# (YES) or a normal table of contents (NO) in the .chm file. Furthermore it +# enables the Previous and Next buttons. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +BINARY_TOC = NO + +# The TOC_EXPAND flag can be set to YES to add extra items for group members to +# the table of contents of the HTML help documentation and to the tree view. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTMLHELP is set to YES. + +TOC_EXPAND = NO + +# If the GENERATE_QHP tag is set to YES and both QHP_NAMESPACE and +# QHP_VIRTUAL_FOLDER are set, an additional index file will be generated that +# can be used as input for Qt's qhelpgenerator to generate a Qt Compressed Help +# (.qch) of the generated HTML documentation. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +GENERATE_QHP = NO + +# If the QHG_LOCATION tag is specified, the QCH_FILE tag can be used to specify +# the file name of the resulting .qch file. The path specified is relative to +# the HTML output folder. +# This tag requires that the tag GENERATE_QHP is set to YES. + +QCH_FILE = + +# The QHP_NAMESPACE tag specifies the namespace to use when generating Qt Help +# Project output. For more information please see Qt Help Project / Namespace +# (see: +# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#namespace). +# The default value is: org.doxygen.Project. +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHP_NAMESPACE = + +# The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating Qt +# Help Project output. For more information please see Qt Help Project / Virtual +# Folders (see: +# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#virtual-folders). +# The default value is: doc. +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHP_VIRTUAL_FOLDER = doc + +# If the QHP_CUST_FILTER_NAME tag is set, it specifies the name of a custom +# filter to add. For more information please see Qt Help Project / Custom +# Filters (see: +# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters). +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHP_CUST_FILTER_NAME = + +# The QHP_CUST_FILTER_ATTRS tag specifies the list of the attributes of the +# custom filter to add. For more information please see Qt Help Project / Custom +# Filters (see: +# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters). +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHP_CUST_FILTER_ATTRS = + +# The QHP_SECT_FILTER_ATTRS tag specifies the list of the attributes this +# project's filter section matches. Qt Help Project / Filter Attributes (see: +# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#filter-attributes). +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHP_SECT_FILTER_ATTRS = + +# The QHG_LOCATION tag can be used to specify the location (absolute path +# including file name) of Qt's qhelpgenerator. If non-empty doxygen will try to +# run qhelpgenerator on the generated .qhp file. +# This tag requires that the tag GENERATE_QHP is set to YES. + +QHG_LOCATION = + +# If the GENERATE_ECLIPSEHELP tag is set to YES, additional index files will be +# generated, together with the HTML files, they form an Eclipse help plugin. To +# install this plugin and make it available under the help contents menu in +# Eclipse, the contents of the directory containing the HTML and XML files needs +# to be copied into the plugins directory of eclipse. The name of the directory +# within the plugins directory should be the same as the ECLIPSE_DOC_ID value. +# After copying Eclipse needs to be restarted before the help appears. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +GENERATE_ECLIPSEHELP = NO + +# A unique identifier for the Eclipse help plugin. When installing the plugin +# the directory name containing the HTML and XML files should also have this +# name. Each documentation set should have its own identifier. +# The default value is: org.doxygen.Project. +# This tag requires that the tag GENERATE_ECLIPSEHELP is set to YES. + +ECLIPSE_DOC_ID = org.doxygen.Project + +# If you want full control over the layout of the generated HTML pages it might +# be necessary to disable the index and replace it with your own. The +# DISABLE_INDEX tag can be used to turn on/off the condensed index (tabs) at top +# of each HTML page. A value of NO enables the index and the value YES disables +# it. Since the tabs in the index contain the same information as the navigation +# tree, you can set this option to YES if you also set GENERATE_TREEVIEW to YES. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +DISABLE_INDEX = NO + +# The GENERATE_TREEVIEW tag is used to specify whether a tree-like index +# structure should be generated to display hierarchical information. If the tag +# value is set to YES, a side panel will be generated containing a tree-like +# index structure (just like the one that is generated for HTML Help). For this +# to work a browser that supports JavaScript, DHTML, CSS and frames is required +# (i.e. any modern browser). Windows users are probably better off using the +# HTML help feature. Via custom style sheets (see HTML_EXTRA_STYLESHEET) one can +# further fine tune the look of the index (see "Fine-tuning the output"). As an +# example, the default style sheet generated by doxygen has an example that +# shows how to put an image at the root of the tree instead of the PROJECT_NAME. +# Since the tree basically has the same information as the tab index, you could +# consider setting DISABLE_INDEX to YES when enabling this option. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +GENERATE_TREEVIEW = NO + +# When both GENERATE_TREEVIEW and DISABLE_INDEX are set to YES, then the +# FULL_SIDEBAR option determines if the side bar is limited to only the treeview +# area (value NO) or if it should extend to the full height of the window (value +# YES). Setting this to YES gives a layout similar to +# https://docs.readthedocs.io with more room for contents, but less room for the +# project logo, title, and description. If either GENERATE_TREEVIEW or +# DISABLE_INDEX is set to NO, this option has no effect. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +FULL_SIDEBAR = NO + +# The ENUM_VALUES_PER_LINE tag can be used to set the number of enum values that +# doxygen will group on one line in the generated HTML documentation. +# +# Note that a value of 0 will completely suppress the enum values from appearing +# in the overview section. +# Minimum value: 0, maximum value: 20, default value: 4. +# This tag requires that the tag GENERATE_HTML is set to YES. + +ENUM_VALUES_PER_LINE = 4 + +# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be used +# to set the initial width (in pixels) of the frame in which the tree is shown. +# Minimum value: 0, maximum value: 1500, default value: 250. +# This tag requires that the tag GENERATE_HTML is set to YES. + +TREEVIEW_WIDTH = 250 + +# If the EXT_LINKS_IN_WINDOW option is set to YES, doxygen will open links to +# external symbols imported via tag files in a separate window. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +EXT_LINKS_IN_WINDOW = NO + +# If the OBFUSCATE_EMAILS tag is set to YES, doxygen will obfuscate email +# addresses. +# The default value is: YES. +# This tag requires that the tag GENERATE_HTML is set to YES. + +OBFUSCATE_EMAILS = YES + +# If the HTML_FORMULA_FORMAT option is set to svg, doxygen will use the pdf2svg +# tool (see https://github.com/dawbarton/pdf2svg) or inkscape (see +# https://inkscape.org) to generate formulas as SVG images instead of PNGs for +# the HTML output. These images will generally look nicer at scaled resolutions. +# Possible values are: png (the default) and svg (looks nicer but requires the +# pdf2svg or inkscape tool). +# The default value is: png. +# This tag requires that the tag GENERATE_HTML is set to YES. + +HTML_FORMULA_FORMAT = png + +# Use this tag to change the font size of LaTeX formulas included as images in +# the HTML documentation. When you change the font size after a successful +# doxygen run you need to manually remove any form_*.png images from the HTML +# output directory to force them to be regenerated. +# Minimum value: 8, maximum value: 50, default value: 10. +# This tag requires that the tag GENERATE_HTML is set to YES. + +FORMULA_FONTSIZE = 10 + +# Use the FORMULA_TRANSPARENT tag to determine whether or not the images +# generated for formulas are transparent PNGs. Transparent PNGs are not +# supported properly for IE 6.0, but are supported on all modern browsers. +# +# Note that when changing this option you need to delete any form_*.png files in +# the HTML output directory before the changes have effect. +# The default value is: YES. +# This tag requires that the tag GENERATE_HTML is set to YES. + +FORMULA_TRANSPARENT = YES + +# The FORMULA_MACROFILE can contain LaTeX \newcommand and \renewcommand commands +# to create new LaTeX commands to be used in formulas as building blocks. See +# the section "Including formulas" for details. + +FORMULA_MACROFILE = + +# Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see +# https://www.mathjax.org) which uses client side JavaScript for the rendering +# instead of using pre-rendered bitmaps. Use this if you do not have LaTeX +# installed or if you want to formulas look prettier in the HTML output. When +# enabled you may also need to install MathJax separately and configure the path +# to it using the MATHJAX_RELPATH option. +# The default value is: NO. +# This tag requires that the tag GENERATE_HTML is set to YES. + +USE_MATHJAX = NO + +# With MATHJAX_VERSION it is possible to specify the MathJax version to be used. +# Note that the different versions of MathJax have different requirements with +# regards to the different settings, so it is possible that also other MathJax +# settings have to be changed when switching between the different MathJax +# versions. +# Possible values are: MathJax_2 and MathJax_3. +# The default value is: MathJax_2. +# This tag requires that the tag USE_MATHJAX is set to YES. + +MATHJAX_VERSION = MathJax_2 + +# When MathJax is enabled you can set the default output format to be used for +# the MathJax output. For more details about the output format see MathJax +# version 2 (see: +# http://docs.mathjax.org/en/v2.7-latest/output.html) and MathJax version 3 +# (see: +# http://docs.mathjax.org/en/latest/web/components/output.html). +# Possible values are: HTML-CSS (which is slower, but has the best +# compatibility. This is the name for Mathjax version 2, for MathJax version 3 +# this will be translated into chtml), NativeMML (i.e. MathML. Only supported +# for NathJax 2. For MathJax version 3 chtml will be used instead.), chtml (This +# is the name for Mathjax version 3, for MathJax version 2 this will be +# translated into HTML-CSS) and SVG. +# The default value is: HTML-CSS. +# This tag requires that the tag USE_MATHJAX is set to YES. + +MATHJAX_FORMAT = HTML-CSS + +# When MathJax is enabled you need to specify the location relative to the HTML +# output directory using the MATHJAX_RELPATH option. The destination directory +# should contain the MathJax.js script. For instance, if the mathjax directory +# is located at the same level as the HTML output directory, then +# MATHJAX_RELPATH should be ../mathjax. The default value points to the MathJax +# Content Delivery Network so you can quickly see the result without installing +# MathJax. However, it is strongly recommended to install a local copy of +# MathJax from https://www.mathjax.org before deployment. The default value is: +# - in case of MathJax version 2: https://cdn.jsdelivr.net/npm/mathjax@2 +# - in case of MathJax version 3: https://cdn.jsdelivr.net/npm/mathjax@3 +# This tag requires that the tag USE_MATHJAX is set to YES. + +MATHJAX_RELPATH = http://cdn.mathjax.org/mathjax/latest + +# The MATHJAX_EXTENSIONS tag can be used to specify one or more MathJax +# extension names that should be enabled during MathJax rendering. For example +# for MathJax version 2 (see +# https://docs.mathjax.org/en/v2.7-latest/tex.html#tex-and-latex-extensions): +# MATHJAX_EXTENSIONS = TeX/AMSmath TeX/AMSsymbols +# For example for MathJax version 3 (see +# http://docs.mathjax.org/en/latest/input/tex/extensions/index.html): +# MATHJAX_EXTENSIONS = ams +# This tag requires that the tag USE_MATHJAX is set to YES. + +MATHJAX_EXTENSIONS = + +# The MATHJAX_CODEFILE tag can be used to specify a file with javascript pieces +# of code that will be used on startup of the MathJax code. See the MathJax site +# (see: +# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details. For an +# example see the documentation. +# This tag requires that the tag USE_MATHJAX is set to YES. + +MATHJAX_CODEFILE = + +# When the SEARCHENGINE tag is enabled doxygen will generate a search box for +# the HTML output. The underlying search engine uses javascript and DHTML and +# should work on any modern browser. Note that when using HTML help +# (GENERATE_HTMLHELP), Qt help (GENERATE_QHP), or docsets (GENERATE_DOCSET) +# there is already a search function so this one should typically be disabled. +# For large projects the javascript based search engine can be slow, then +# enabling SERVER_BASED_SEARCH may provide a better solution. It is possible to +# search using the keyboard; to jump to the search box use <access key> + S +# (what the <access key> is depends on the OS and browser, but it is typically +# <CTRL>, <ALT>/<option>, or both). Inside the search box use the <cursor down +# key> to jump into the search results window, the results can be navigated +# using the <cursor keys>. Press <Enter> to select an item or <escape> to cancel +# the search. The filter options can be selected when the cursor is inside the +# search box by pressing <Shift>+<cursor down>. Also here use the <cursor keys> +# to select a filter and <Enter> or <escape> to activate or cancel the filter +# option. +# The default value is: YES. +# This tag requires that the tag GENERATE_HTML is set to YES. + +SEARCHENGINE = YES + +# When the SERVER_BASED_SEARCH tag is enabled the search engine will be +# implemented using a web server instead of a web client using JavaScript. There +# are two flavors of web server based searching depending on the EXTERNAL_SEARCH +# setting. When disabled, doxygen will generate a PHP script for searching and +# an index file used by the script. When EXTERNAL_SEARCH is enabled the indexing +# and searching needs to be provided by external tools. See the section +# "External Indexing and Searching" for details. +# The default value is: NO. +# This tag requires that the tag SEARCHENGINE is set to YES. + +SERVER_BASED_SEARCH = NO + +# When EXTERNAL_SEARCH tag is enabled doxygen will no longer generate the PHP +# script for searching. Instead the search results are written to an XML file +# which needs to be processed by an external indexer. Doxygen will invoke an +# external search engine pointed to by the SEARCHENGINE_URL option to obtain the +# search results. +# +# Doxygen ships with an example indexer (doxyindexer) and search engine +# (doxysearch.cgi) which are based on the open source search engine library +# Xapian (see: +# https://xapian.org/). +# +# See the section "External Indexing and Searching" for details. +# The default value is: NO. +# This tag requires that the tag SEARCHENGINE is set to YES. + +EXTERNAL_SEARCH = NO + +# The SEARCHENGINE_URL should point to a search engine hosted by a web server +# which will return the search results when EXTERNAL_SEARCH is enabled. +# +# Doxygen ships with an example indexer (doxyindexer) and search engine +# (doxysearch.cgi) which are based on the open source search engine library +# Xapian (see: +# https://xapian.org/). See the section "External Indexing and Searching" for +# details. +# This tag requires that the tag SEARCHENGINE is set to YES. + +SEARCHENGINE_URL = + +# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the unindexed +# search data is written to a file for indexing by an external tool. With the +# SEARCHDATA_FILE tag the name of this file can be specified. +# The default file is: searchdata.xml. +# This tag requires that the tag SEARCHENGINE is set to YES. + +SEARCHDATA_FILE = searchdata.xml + +# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the +# EXTERNAL_SEARCH_ID tag can be used as an identifier for the project. This is +# useful in combination with EXTRA_SEARCH_MAPPINGS to search through multiple +# projects and redirect the results back to the right project. +# This tag requires that the tag SEARCHENGINE is set to YES. + +EXTERNAL_SEARCH_ID = + +# The EXTRA_SEARCH_MAPPINGS tag can be used to enable searching through doxygen +# projects other than the one defined by this configuration file, but that are +# all added to the same external search index. Each project needs to have a +# unique id set via EXTERNAL_SEARCH_ID. The search mapping then maps the id of +# to a relative location where the documentation can be found. The format is: +# EXTRA_SEARCH_MAPPINGS = tagname1=loc1 tagname2=loc2 ... +# This tag requires that the tag SEARCHENGINE is set to YES. + +EXTRA_SEARCH_MAPPINGS = + +#--------------------------------------------------------------------------- +# Configuration options related to the LaTeX output +#--------------------------------------------------------------------------- + +# If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output. +# The default value is: YES. + +GENERATE_LATEX = NO + +# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a +# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of +# it. +# The default directory is: latex. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_OUTPUT = latex + +# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be +# invoked. +# +# Note that when not enabling USE_PDFLATEX the default is latex when enabling +# USE_PDFLATEX the default is pdflatex and when in the later case latex is +# chosen this is overwritten by pdflatex. For specific output languages the +# default can have been set differently, this depends on the implementation of +# the output language. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_CMD_NAME = latex + +# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to generate +# index for LaTeX. +# Note: This tag is used in the Makefile / make.bat. +# See also: LATEX_MAKEINDEX_CMD for the part in the generated output file +# (.tex). +# The default file is: makeindex. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +MAKEINDEX_CMD_NAME = makeindex + +# The LATEX_MAKEINDEX_CMD tag can be used to specify the command name to +# generate index for LaTeX. In case there is no backslash (\) as first character +# it will be automatically added in the LaTeX code. +# Note: This tag is used in the generated output file (.tex). +# See also: MAKEINDEX_CMD_NAME for the part in the Makefile / make.bat. +# The default value is: makeindex. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_MAKEINDEX_CMD = makeindex + +# If the COMPACT_LATEX tag is set to YES, doxygen generates more compact LaTeX +# documents. This may be useful for small projects and may help to save some +# trees in general. +# The default value is: NO. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +COMPACT_LATEX = NO + +# The PAPER_TYPE tag can be used to set the paper type that is used by the +# printer. +# Possible values are: a4 (210 x 297 mm), letter (8.5 x 11 inches), legal (8.5 x +# 14 inches) and executive (7.25 x 10.5 inches). +# The default value is: a4. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +PAPER_TYPE = a4 + +# The EXTRA_PACKAGES tag can be used to specify one or more LaTeX package names +# that should be included in the LaTeX output. The package can be specified just +# by its name or with the correct syntax as to be used with the LaTeX +# \usepackage command. To get the times font for instance you can specify : +# EXTRA_PACKAGES=times or EXTRA_PACKAGES={times} +# To use the option intlimits with the amsmath package you can specify: +# EXTRA_PACKAGES=[intlimits]{amsmath} +# If left blank no extra packages will be included. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +EXTRA_PACKAGES = + +# The LATEX_HEADER tag can be used to specify a user-defined LaTeX header for +# the generated LaTeX document. The header should contain everything until the +# first chapter. If it is left blank doxygen will generate a standard header. It +# is highly recommended to start with a default header using +# doxygen -w latex new_header.tex new_footer.tex new_stylesheet.sty +# and then modify the file new_header.tex. See also section "Doxygen usage" for +# information on how to generate the default header that doxygen normally uses. +# +# Note: Only use a user-defined header if you know what you are doing! +# Note: The header is subject to change so you typically have to regenerate the +# default header when upgrading to a newer version of doxygen. The following +# commands have a special meaning inside the header (and footer): For a +# description of the possible markers and block names see the documentation. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_HEADER = + +# The LATEX_FOOTER tag can be used to specify a user-defined LaTeX footer for +# the generated LaTeX document. The footer should contain everything after the +# last chapter. If it is left blank doxygen will generate a standard footer. See +# LATEX_HEADER for more information on how to generate a default footer and what +# special commands can be used inside the footer. See also section "Doxygen +# usage" for information on how to generate the default footer that doxygen +# normally uses. Note: Only use a user-defined footer if you know what you are +# doing! +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_FOOTER = + +# The LATEX_EXTRA_STYLESHEET tag can be used to specify additional user-defined +# LaTeX style sheets that are included after the standard style sheets created +# by doxygen. Using this option one can overrule certain style aspects. Doxygen +# will copy the style sheet files to the output directory. +# Note: The order of the extra style sheet files is of importance (e.g. the last +# style sheet in the list overrules the setting of the previous ones in the +# list). +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_EXTRA_STYLESHEET = + +# The LATEX_EXTRA_FILES tag can be used to specify one or more extra images or +# other source files which should be copied to the LATEX_OUTPUT output +# directory. Note that the files will be copied as-is; there are no commands or +# markers available. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_EXTRA_FILES = + +# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated is +# prepared for conversion to PDF (using ps2pdf or pdflatex). The PDF file will +# contain links (just like the HTML output) instead of page references. This +# makes the output suitable for online browsing using a PDF viewer. +# The default value is: YES. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +PDF_HYPERLINKS = YES + +# If the USE_PDFLATEX tag is set to YES, doxygen will use the engine as +# specified with LATEX_CMD_NAME to generate the PDF file directly from the LaTeX +# files. Set this option to YES, to get a higher quality PDF documentation. +# +# See also section LATEX_CMD_NAME for selecting the engine. +# The default value is: YES. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +USE_PDFLATEX = YES + +# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \batchmode +# command to the generated LaTeX files. This will instruct LaTeX to keep running +# if errors occur, instead of asking the user for help. +# The default value is: NO. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_BATCHMODE = NO + +# If the LATEX_HIDE_INDICES tag is set to YES then doxygen will not include the +# index chapters (such as File Index, Compound Index, etc.) in the output. +# The default value is: NO. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_HIDE_INDICES = NO + +# The LATEX_BIB_STYLE tag can be used to specify the style to use for the +# bibliography, e.g. plainnat, or ieeetr. See +# https://en.wikipedia.org/wiki/BibTeX and \cite for more info. +# The default value is: plain. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_BIB_STYLE = plain + +# If the LATEX_TIMESTAMP tag is set to YES then the footer of each generated +# page will contain the date and time when the page was generated. Setting this +# to NO can help when comparing the output of multiple runs. +# The default value is: NO. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_TIMESTAMP = NO + +# The LATEX_EMOJI_DIRECTORY tag is used to specify the (relative or absolute) +# path from which the emoji images will be read. If a relative path is entered, +# it will be relative to the LATEX_OUTPUT directory. If left blank the +# LATEX_OUTPUT directory will be used. +# This tag requires that the tag GENERATE_LATEX is set to YES. + +LATEX_EMOJI_DIRECTORY = + +#--------------------------------------------------------------------------- +# Configuration options related to the RTF output +#--------------------------------------------------------------------------- + +# If the GENERATE_RTF tag is set to YES, doxygen will generate RTF output. The +# RTF output is optimized for Word 97 and may not look too pretty with other RTF +# readers/editors. +# The default value is: NO. + +GENERATE_RTF = NO + +# The RTF_OUTPUT tag is used to specify where the RTF docs will be put. If a +# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of +# it. +# The default directory is: rtf. +# This tag requires that the tag GENERATE_RTF is set to YES. + +RTF_OUTPUT = rtf + +# If the COMPACT_RTF tag is set to YES, doxygen generates more compact RTF +# documents. This may be useful for small projects and may help to save some +# trees in general. +# The default value is: NO. +# This tag requires that the tag GENERATE_RTF is set to YES. + +COMPACT_RTF = NO + +# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated will +# contain hyperlink fields. The RTF file will contain links (just like the HTML +# output) instead of page references. This makes the output suitable for online +# browsing using Word or some other Word compatible readers that support those +# fields. +# +# Note: WordPad (write) and others do not support links. +# The default value is: NO. +# This tag requires that the tag GENERATE_RTF is set to YES. + +RTF_HYPERLINKS = NO + +# Load stylesheet definitions from file. Syntax is similar to doxygen's +# configuration file, i.e. a series of assignments. You only have to provide +# replacements, missing definitions are set to their default value. +# +# See also section "Doxygen usage" for information on how to generate the +# default style sheet that doxygen normally uses. +# This tag requires that the tag GENERATE_RTF is set to YES. + +RTF_STYLESHEET_FILE = + +# Set optional variables used in the generation of an RTF document. Syntax is +# similar to doxygen's configuration file. A template extensions file can be +# generated using doxygen -e rtf extensionFile. +# This tag requires that the tag GENERATE_RTF is set to YES. + +RTF_EXTENSIONS_FILE = + +#--------------------------------------------------------------------------- +# Configuration options related to the man page output +#--------------------------------------------------------------------------- + +# If the GENERATE_MAN tag is set to YES, doxygen will generate man pages for +# classes and files. +# The default value is: NO. + +GENERATE_MAN = NO + +# The MAN_OUTPUT tag is used to specify where the man pages will be put. If a +# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of +# it. A directory man3 will be created inside the directory specified by +# MAN_OUTPUT. +# The default directory is: man. +# This tag requires that the tag GENERATE_MAN is set to YES. + +MAN_OUTPUT = man + +# The MAN_EXTENSION tag determines the extension that is added to the generated +# man pages. In case the manual section does not start with a number, the number +# 3 is prepended. The dot (.) at the beginning of the MAN_EXTENSION tag is +# optional. +# The default value is: .3. +# This tag requires that the tag GENERATE_MAN is set to YES. + +MAN_EXTENSION = .3 + +# The MAN_SUBDIR tag determines the name of the directory created within +# MAN_OUTPUT in which the man pages are placed. If defaults to man followed by +# MAN_EXTENSION with the initial . removed. +# This tag requires that the tag GENERATE_MAN is set to YES. + +MAN_SUBDIR = + +# If the MAN_LINKS tag is set to YES and doxygen generates man output, then it +# will generate one additional man file for each entity documented in the real +# man page(s). These additional files only source the real man page, but without +# them the man command would be unable to find the correct page. +# The default value is: NO. +# This tag requires that the tag GENERATE_MAN is set to YES. + +MAN_LINKS = NO + +#--------------------------------------------------------------------------- +# Configuration options related to the XML output +#--------------------------------------------------------------------------- + +# If the GENERATE_XML tag is set to YES, doxygen will generate an XML file that +# captures the structure of the code including all documentation. +# The default value is: NO. + +GENERATE_XML = NO + +# The XML_OUTPUT tag is used to specify where the XML pages will be put. If a +# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of +# it. +# The default directory is: xml. +# This tag requires that the tag GENERATE_XML is set to YES. + +XML_OUTPUT = xml + +# If the XML_PROGRAMLISTING tag is set to YES, doxygen will dump the program +# listings (including syntax highlighting and cross-referencing information) to +# the XML output. Note that enabling this will significantly increase the size +# of the XML output. +# The default value is: YES. +# This tag requires that the tag GENERATE_XML is set to YES. + +XML_PROGRAMLISTING = YES + +# If the XML_NS_MEMB_FILE_SCOPE tag is set to YES, doxygen will include +# namespace members in file scope as well, matching the HTML output. +# The default value is: NO. +# This tag requires that the tag GENERATE_XML is set to YES. + +XML_NS_MEMB_FILE_SCOPE = NO + +#--------------------------------------------------------------------------- +# Configuration options related to the DOCBOOK output +#--------------------------------------------------------------------------- + +# If the GENERATE_DOCBOOK tag is set to YES, doxygen will generate Docbook files +# that can be used to generate PDF. +# The default value is: NO. + +GENERATE_DOCBOOK = NO + +# The DOCBOOK_OUTPUT tag is used to specify where the Docbook pages will be put. +# If a relative path is entered the value of OUTPUT_DIRECTORY will be put in +# front of it. +# The default directory is: docbook. +# This tag requires that the tag GENERATE_DOCBOOK is set to YES. + +DOCBOOK_OUTPUT = docbook + +#--------------------------------------------------------------------------- +# Configuration options for the AutoGen Definitions output +#--------------------------------------------------------------------------- + +# If the GENERATE_AUTOGEN_DEF tag is set to YES, doxygen will generate an +# AutoGen Definitions (see http://autogen.sourceforge.net/) file that captures +# the structure of the code including all documentation. Note that this feature +# is still experimental and incomplete at the moment. +# The default value is: NO. + +GENERATE_AUTOGEN_DEF = NO + +#--------------------------------------------------------------------------- +# Configuration options related to the Perl module output +#--------------------------------------------------------------------------- + +# If the GENERATE_PERLMOD tag is set to YES, doxygen will generate a Perl module +# file that captures the structure of the code including all documentation. +# +# Note that this feature is still experimental and incomplete at the moment. +# The default value is: NO. + +GENERATE_PERLMOD = NO + +# If the PERLMOD_LATEX tag is set to YES, doxygen will generate the necessary +# Makefile rules, Perl scripts and LaTeX code to be able to generate PDF and DVI +# output from the Perl module output. +# The default value is: NO. +# This tag requires that the tag GENERATE_PERLMOD is set to YES. + +PERLMOD_LATEX = NO + +# If the PERLMOD_PRETTY tag is set to YES, the Perl module output will be nicely +# formatted so it can be parsed by a human reader. This is useful if you want to +# understand what is going on. On the other hand, if this tag is set to NO, the +# size of the Perl module output will be much smaller and Perl will parse it +# just the same. +# The default value is: YES. +# This tag requires that the tag GENERATE_PERLMOD is set to YES. + +PERLMOD_PRETTY = YES + +# The names of the make variables in the generated doxyrules.make file are +# prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX. This is useful +# so different doxyrules.make files included by the same Makefile don't +# overwrite each other's variables. +# This tag requires that the tag GENERATE_PERLMOD is set to YES. + +PERLMOD_MAKEVAR_PREFIX = + +#--------------------------------------------------------------------------- +# Configuration options related to the preprocessor +#--------------------------------------------------------------------------- + +# If the ENABLE_PREPROCESSING tag is set to YES, doxygen will evaluate all +# C-preprocessor directives found in the sources and include files. +# The default value is: YES. + +ENABLE_PREPROCESSING = YES + +# If the MACRO_EXPANSION tag is set to YES, doxygen will expand all macro names +# in the source code. If set to NO, only conditional compilation will be +# performed. Macro expansion can be done in a controlled way by setting +# EXPAND_ONLY_PREDEF to YES. +# The default value is: NO. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +MACRO_EXPANSION = NO + +# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then +# the macro expansion is limited to the macros specified with the PREDEFINED and +# EXPAND_AS_DEFINED tags. +# The default value is: NO. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +EXPAND_ONLY_PREDEF = NO + +# If the SEARCH_INCLUDES tag is set to YES, the include files in the +# INCLUDE_PATH will be searched if a #include is found. +# The default value is: YES. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +SEARCH_INCLUDES = YES + +# The INCLUDE_PATH tag can be used to specify one or more directories that +# contain include files that are not input files but should be processed by the +# preprocessor. Note that the INCLUDE_PATH is not recursive, so the setting of +# RECURSIVE has no effect here. +# This tag requires that the tag SEARCH_INCLUDES is set to YES. + +INCLUDE_PATH = + +# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard +# patterns (like *.h and *.hpp) to filter out the header-files in the +# directories. If left blank, the patterns specified with FILE_PATTERNS will be +# used. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +INCLUDE_FILE_PATTERNS = + +# The PREDEFINED tag can be used to specify one or more macro names that are +# defined before the preprocessor is started (similar to the -D option of e.g. +# gcc). The argument of the tag is a list of macros of the form: name or +# name=definition (no spaces). If the definition and the "=" are omitted, "=1" +# is assumed. To prevent a macro definition from being undefined via #undef or +# recursively expanded use the := operator instead of the = operator. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +PREDEFINED = + +# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this +# tag can be used to specify a list of macro names that should be expanded. The +# macro definition that is found in the sources will be used. Use the PREDEFINED +# tag if you want to use a different macro definition that overrules the +# definition found in the source code. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +EXPAND_AS_DEFINED = + +# If the SKIP_FUNCTION_MACROS tag is set to YES then doxygen's preprocessor will +# remove all references to function-like macros that are alone on a line, have +# an all uppercase name, and do not end with a semicolon. Such function macros +# are typically used for boiler-plate code, and will confuse the parser if not +# removed. +# The default value is: YES. +# This tag requires that the tag ENABLE_PREPROCESSING is set to YES. + +SKIP_FUNCTION_MACROS = YES + +#--------------------------------------------------------------------------- +# Configuration options related to external references +#--------------------------------------------------------------------------- + +# The TAGFILES tag can be used to specify one or more tag files. For each tag +# file the location of the external documentation should be added. The format of +# a tag file without this location is as follows: +# TAGFILES = file1 file2 ... +# Adding location for the tag files is done as follows: +# TAGFILES = file1=loc1 "file2 = loc2" ... +# where loc1 and loc2 can be relative or absolute paths or URLs. See the +# section "Linking to external documentation" for more information about the use +# of tag files. +# Note: Each tag file must have a unique name (where the name does NOT include +# the path). If a tag file is not located in the directory in which doxygen is +# run, you must also specify the path to the tagfile here. + +TAGFILES = + +# When a file name is specified after GENERATE_TAGFILE, doxygen will create a +# tag file that is based on the input files it reads. See section "Linking to +# external documentation" for more information about the usage of tag files. + +GENERATE_TAGFILE = + +# If the ALLEXTERNALS tag is set to YES, all external class will be listed in +# the class index. If set to NO, only the inherited external classes will be +# listed. +# The default value is: NO. + +ALLEXTERNALS = NO + +# If the EXTERNAL_GROUPS tag is set to YES, all external groups will be listed +# in the modules index. If set to NO, only the current project's groups will be +# listed. +# The default value is: YES. + +EXTERNAL_GROUPS = YES + +# If the EXTERNAL_PAGES tag is set to YES, all external pages will be listed in +# the related pages index. If set to NO, only the current project's pages will +# be listed. +# The default value is: YES. + +EXTERNAL_PAGES = YES + +#--------------------------------------------------------------------------- +# Configuration options related to the dot tool +#--------------------------------------------------------------------------- + +# You can include diagrams made with dia in doxygen documentation. Doxygen will +# then run dia to produce the diagram and insert it in the documentation. The +# DIA_PATH tag allows you to specify the directory where the dia binary resides. +# If left empty dia is assumed to be found in the default search path. + +DIA_PATH = + +# If set to YES the inheritance and collaboration graphs will hide inheritance +# and usage relations if the target is undocumented or is not a class. +# The default value is: YES. + +HIDE_UNDOC_RELATIONS = YES + +# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is +# available from the path. This tool is part of Graphviz (see: +# http://www.graphviz.org/), a graph visualization toolkit from AT&T and Lucent +# Bell Labs. The other options in this section have no effect if this option is +# set to NO +# The default value is: YES. + +HAVE_DOT = @HAVE_DOT@ + +# The DOT_NUM_THREADS specifies the number of dot invocations doxygen is allowed +# to run in parallel. When set to 0 doxygen will base this on the number of +# processors available in the system. You can set it explicitly to a value +# larger than 0 to get control over the balance between CPU load and processing +# speed. +# Minimum value: 0, maximum value: 32, default value: 0. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_NUM_THREADS = 0 + +# When you want a differently looking font in the dot files that doxygen +# generates you can specify the font name using DOT_FONTNAME. You need to make +# sure dot is able to find the font, which can be done by putting it in a +# standard location or by setting the DOTFONTPATH environment variable or by +# setting DOT_FONTPATH to the directory containing the font. +# The default value is: Helvetica. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_FONTNAME = + +# The DOT_FONTSIZE tag can be used to set the size (in points) of the font of +# dot graphs. +# Minimum value: 4, maximum value: 24, default value: 10. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_FONTSIZE = 10 + +# By default doxygen will tell dot to use the default font as specified with +# DOT_FONTNAME. If you specify a different font using DOT_FONTNAME you can set +# the path where dot can find it using this tag. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_FONTPATH = + +# If the CLASS_GRAPH tag is set to YES (or GRAPH) then doxygen will generate a +# graph for each documented class showing the direct and indirect inheritance +# relations. In case HAVE_DOT is set as well dot will be used to draw the graph, +# otherwise the built-in generator will be used. If the CLASS_GRAPH tag is set +# to TEXT the direct and indirect inheritance relations will be shown as texts / +# links. +# Possible values are: NO, YES, TEXT and GRAPH. +# The default value is: YES. + +CLASS_GRAPH = YES + +# If the COLLABORATION_GRAPH tag is set to YES then doxygen will generate a +# graph for each documented class showing the direct and indirect implementation +# dependencies (inheritance, containment, and class references variables) of the +# class with other documented classes. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +COLLABORATION_GRAPH = YES + +# If the GROUP_GRAPHS tag is set to YES then doxygen will generate a graph for +# groups, showing the direct groups dependencies. See also the chapter Grouping +# in the manual. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +GROUP_GRAPHS = YES + +# If the UML_LOOK tag is set to YES, doxygen will generate inheritance and +# collaboration diagrams in a style similar to the OMG's Unified Modeling +# Language. +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +UML_LOOK = NO + +# If the UML_LOOK tag is enabled, the fields and methods are shown inside the +# class node. If there are many fields or methods and many nodes the graph may +# become too big to be useful. The UML_LIMIT_NUM_FIELDS threshold limits the +# number of items for each type to make the size more manageable. Set this to 0 +# for no limit. Note that the threshold may be exceeded by 50% before the limit +# is enforced. So when you set the threshold to 10, up to 15 fields may appear, +# but if the number exceeds 15, the total amount of fields shown is limited to +# 10. +# Minimum value: 0, maximum value: 100, default value: 10. +# This tag requires that the tag UML_LOOK is set to YES. + +UML_LIMIT_NUM_FIELDS = 10 + +# If the DOT_UML_DETAILS tag is set to NO, doxygen will show attributes and +# methods without types and arguments in the UML graphs. If the DOT_UML_DETAILS +# tag is set to YES, doxygen will add type and arguments for attributes and +# methods in the UML graphs. If the DOT_UML_DETAILS tag is set to NONE, doxygen +# will not generate fields with class member information in the UML graphs. The +# class diagrams will look similar to the default class diagrams but using UML +# notation for the relationships. +# Possible values are: NO, YES and NONE. +# The default value is: NO. +# This tag requires that the tag UML_LOOK is set to YES. + +DOT_UML_DETAILS = NO + +# The DOT_WRAP_THRESHOLD tag can be used to set the maximum number of characters +# to display on a single line. If the actual line length exceeds this threshold +# significantly it will wrapped across multiple lines. Some heuristics are apply +# to avoid ugly line breaks. +# Minimum value: 0, maximum value: 1000, default value: 17. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_WRAP_THRESHOLD = 17 + +# If the TEMPLATE_RELATIONS tag is set to YES then the inheritance and +# collaboration graphs will show the relations between templates and their +# instances. +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +TEMPLATE_RELATIONS = NO + +# If the INCLUDE_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are set to +# YES then doxygen will generate a graph for each documented file showing the +# direct and indirect include dependencies of the file with other documented +# files. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +INCLUDE_GRAPH = YES + +# If the INCLUDED_BY_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are +# set to YES then doxygen will generate a graph for each documented file showing +# the direct and indirect include dependencies of the file with other documented +# files. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +INCLUDED_BY_GRAPH = YES + +# If the CALL_GRAPH tag is set to YES then doxygen will generate a call +# dependency graph for every global function or class method. +# +# Note that enabling this option will significantly increase the time of a run. +# So in most cases it will be better to enable call graphs for selected +# functions only using the \callgraph command. Disabling a call graph can be +# accomplished by means of the command \hidecallgraph. +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +CALL_GRAPH = YES + +# If the CALLER_GRAPH tag is set to YES then doxygen will generate a caller +# dependency graph for every global function or class method. +# +# Note that enabling this option will significantly increase the time of a run. +# So in most cases it will be better to enable caller graphs for selected +# functions only using the \callergraph command. Disabling a caller graph can be +# accomplished by means of the command \hidecallergraph. +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +CALLER_GRAPH = YES + +# If the GRAPHICAL_HIERARCHY tag is set to YES then doxygen will graphical +# hierarchy of all classes instead of a textual one. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +GRAPHICAL_HIERARCHY = YES + +# If the DIRECTORY_GRAPH tag is set to YES then doxygen will show the +# dependencies a directory has on other directories in a graphical way. The +# dependency relations are determined by the #include relations between the +# files in the directories. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +DIRECTORY_GRAPH = YES + +# The DIR_GRAPH_MAX_DEPTH tag can be used to limit the maximum number of levels +# of child directories generated in directory dependency graphs by dot. +# Minimum value: 1, maximum value: 25, default value: 1. +# This tag requires that the tag DIRECTORY_GRAPH is set to YES. + +DIR_GRAPH_MAX_DEPTH = 1 + +# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images +# generated by dot. For an explanation of the image formats see the section +# output formats in the documentation of the dot tool (Graphviz (see: +# http://www.graphviz.org/)). +# Note: If you choose svg you need to set HTML_FILE_EXTENSION to xhtml in order +# to make the SVG files visible in IE 9+ (other browsers do not have this +# requirement). +# Possible values are: png, jpg, jpg:cairo, jpg:cairo:gd, jpg:gd, jpg:gd:gd, +# gif, gif:cairo, gif:cairo:gd, gif:gd, gif:gd:gd, svg, png:gd, png:gd:gd, +# png:cairo, png:cairo:gd, png:cairo:cairo, png:cairo:gdiplus, png:gdiplus and +# png:gdiplus:gdiplus. +# The default value is: png. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_IMAGE_FORMAT = svg + +# If DOT_IMAGE_FORMAT is set to svg, then this option can be set to YES to +# enable generation of interactive SVG images that allow zooming and panning. +# +# Note that this requires a modern browser other than Internet Explorer. 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If left blank, it is assumed the dot tool can be found in the path. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_PATH = + +# The DOTFILE_DIRS tag can be used to specify one or more directories that +# contain dot files that are included in the documentation (see the \dotfile +# command). +# This tag requires that the tag HAVE_DOT is set to YES. + +DOTFILE_DIRS = + +# The MSCFILE_DIRS tag can be used to specify one or more directories that +# contain msc files that are included in the documentation (see the \mscfile +# command). + +MSCFILE_DIRS = + +# The DIAFILE_DIRS tag can be used to specify one or more directories that +# contain dia files that are included in the documentation (see the \diafile +# command). + +DIAFILE_DIRS = + +# When using plantuml, the PLANTUML_JAR_PATH tag should be used to specify the +# path where java can find the plantuml.jar file or to the filename of jar file +# to be used. If left blank, it is assumed PlantUML is not used or called during +# a preprocessing step. Doxygen will generate a warning when it encounters a +# \startuml command in this case and will not generate output for the diagram. + +PLANTUML_JAR_PATH = + +# When using plantuml, the PLANTUML_CFG_FILE tag can be used to specify a +# configuration file for plantuml. + +PLANTUML_CFG_FILE = + +# When using plantuml, the specified paths are searched for files specified by +# the !include statement in a plantuml block. + +PLANTUML_INCLUDE_PATH = + +# The DOT_GRAPH_MAX_NODES tag can be used to set the maximum number of nodes +# that will be shown in the graph. If the number of nodes in a graph becomes +# larger than this value, doxygen will truncate the graph, which is visualized +# by representing a node as a red box. Note that doxygen if the number of direct +# children of the root node in a graph is already larger than +# DOT_GRAPH_MAX_NODES then the graph will not be shown at all. Also note that +# the size of a graph can be further restricted by MAX_DOT_GRAPH_DEPTH. +# Minimum value: 0, maximum value: 10000, default value: 50. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_GRAPH_MAX_NODES = 100 + +# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the graphs +# generated by dot. A depth value of 3 means that only nodes reachable from the +# root by following a path via at most 3 edges will be shown. Nodes that lay +# further from the root node will be omitted. Note that setting this option to 1 +# or 2 may greatly reduce the computation time needed for large code bases. Also +# note that the size of a graph can be further restricted by +# DOT_GRAPH_MAX_NODES. Using a depth of 0 means no depth restriction. +# Minimum value: 0, maximum value: 1000, default value: 0. +# This tag requires that the tag HAVE_DOT is set to YES. + +MAX_DOT_GRAPH_DEPTH = 0 + +# Set the DOT_TRANSPARENT tag to YES to generate images with a transparent +# background. This is disabled by default, because dot on Windows does not seem +# to support this out of the box. +# +# Warning: Depending on the platform used, enabling this option may lead to +# badly anti-aliased labels on the edges of a graph (i.e. they become hard to +# read). +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_TRANSPARENT = YES + +# Set the DOT_MULTI_TARGETS tag to YES to allow dot to generate multiple output +# files in one run (i.e. multiple -o and -T options on the command line). This +# makes dot run faster, but since only newer versions of dot (>1.8.10) support +# this, this feature is disabled by default. +# The default value is: NO. +# This tag requires that the tag HAVE_DOT is set to YES. + +DOT_MULTI_TARGETS = YES + +# If the GENERATE_LEGEND tag is set to YES doxygen will generate a legend page +# explaining the meaning of the various boxes and arrows in the dot generated +# graphs. +# Note: This tag requires that UML_LOOK isn't set, i.e. the doxygen internal +# graphical representation for inheritance and collaboration diagrams is used. +# The default value is: YES. +# This tag requires that the tag HAVE_DOT is set to YES. + +GENERATE_LEGEND = YES + +# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate +# files that are used to generate the various graphs. +# +# Note: This setting is not only used for dot files but also for msc temporary +# files. +# The default value is: YES. + +DOT_CLEANUP = YES diff --git a/doc/README.api b/doc/README.api new file mode 100644 index 0000000..8d72f63 --- /dev/null +++ b/doc/README.api @@ -0,0 +1,35 @@ +This is an (incomplete) list of currently provided APIs by dpkg, and +their supported status. + + +What: libdpkg.a (C static library) +Status: volatile +Description: + The API provided by this library is highly volatile, still in the process + of being cleaned up. It's only supposed to be used internally by dpkg for + now. Header files, functions, variables and types might get renamed, + removed or change semantics. If you still have a need to use it, which + you'd be doing anyway, say by locally building dpkg to get the library, + then define the C preprocessor macro LIBDPKG_VOLATILE_API in your build + to acknowledge that fact. + +What: libdpkg-perl (perl modules) +Status: stable +Description: + Among the perl modules provided by libdpkg-perl, you can safely rely on + those that have $VERSION set to 1.00 (or higher). Note however that the + API is defined by what's documented in the corresponding manual pages and + nothing more. You can't assume anything else based on what you read in + the source code. If you feel the need for further refinements in the + documented API, don't hesitate to file a wishlist bug against + libdpkg-perl. + . + In case of API-breaking changes, the major number in $VERSION will be + increased. For API extensions, the minor number will be increased. + +What: custom changelog parsers as Dpkg::Changelog derived modules +Status: stable +Description: + Since dpkg 1.18.8, custom changelog parsers are supported as modules + derived from the Dpkg::Changelog module. The derived modules need to + implement all required documented methods. diff --git a/doc/README.feature-removal-schedule b/doc/README.feature-removal-schedule new file mode 100644 index 0000000..f9b1f0b --- /dev/null +++ b/doc/README.feature-removal-schedule @@ -0,0 +1,180 @@ +This is a list of features that are scheduled to be removed from dpkg. + +What: fallback of dpkg-source to source format "1.0" without explicit debian/source/format +Status: deprecated +When: 1.17.x +Warning: program and lintian (missing-debian-source-format) +Why: + With the support of multiple source formats, the user should be explicit + about the desired source format. The fallback to "1.0" is there only for + backwards compatibility but will be removed once all packages have the + debian/source/format file. This is unlikely to happen before 1.17.x. + +What --forget-old-unavail (dpkg option) +Status: obsolete +When: 1.16.x +Warning: program +Why: + Purged packages are properly cleaned up now by dpkg, and old unavailable + leftovers are automatically cleaned up on database parsing. So there's no + need anymore for this manual action. + +What: --control-path (dpkg-query option) +Status: deprecated +When: 1.18.x +Warning: man page + This was a semi-public interface now superseded by --control-list and + --control-show, which are a better interface as they do not rely on any + specific database layout. Although there might still be cases where it's + required to avoid hardcoding the database layout, and it will be kept as + long as there's legitimate uses for it and no viable replacements. + +What: -L (dpkg-parsechangelog option) +Status: obsolete +Since: 1.18.8 +When: 1.19.x +Warning: program +Why: + The custom parsers have been switched from programs to perl modules, + and this option has no use any longer. The caller can set PERL5LIB or + PERLLIB to specify the perl module search path now. + +History of feature removals +~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +What: cleanup-info (program) +Status: removed +Since: 1.15.0 +Why: + This program was needed long time ago to fixup broken info dir files + generated by buggy install-info programs. Should not be needed anymore. + +What: --largemem, --smallmem (dpkg option) +Status: removed +When: 1.15.1 +Why: + These options have been no-ops for a long time. + +What: --force-auto-select (dpkg option) +Status: removed +When: 1.15.1 +Why: + This option has been a no-op for so long, that there's no traces on git + history of its usage. + +What: recommended, contrib, base (priority) +Status: removed +When: 1.15.1 +Why: + These priorities have been superseded by either other fields or values in + other fields. + +What: 822-date (program) +Status: removed +When: 1.15.1 +Why: + Should switch to use 'date -R'. + +What: support of custom changelog parsers understanding only -v +Status: removed +Since: 1.15.5 +Why: + The debian changelog parser has been enhanced. It supports new options + that enable more fine-grained retrieval of information. Those new options + will be used by scripts (like dpkg-genchanges). + . + Custom changelog parsers must be updated to support the new API (see + dpkg-parsechangelog(1) and README.api). + +What: support for environment variable DPKG_NO_TSTP +Status: removed +Since: 1.15.6 +Why: + Having two ways to let the administrator get to a shell on conffile prompt + is confusing, it also impedes setting up a consistent environment to be + used by external programs. + +What: support for PGP +Status: removed +When: 1.16.4 +Warning: program +Why: + PGP is not part of Debian and GnuPG has been the standard tool for digital + signatures for several years already. Supporting only GnuPG enables us to + rely on some of its features. + +What: -u, --udeb (dpkg-scanpackages option) +Status: removed +When: 1.16.4 +Warning: program +Why: + This option has been superseded by -tudeb. + +What: support for custom changelog parsers as programs +Status: removed +Since: 1.18.8 +Why: + Using programs to implement the custom changelog parsers was very inefficient + as it required to parse the custom changelog, output deb822 formatted entries + to then parse that and output again with the desired format. + . + These were implemented as programs because at the time the perl code in dpkg + was not using perl modules, so it was not easy to extend. Using perl modules + now is cleaner and allows for a faster implementation. + . + In addition there's no known users in Debian, so it was deemed safe to remove + the support without a transition. + +What: Source-Version (substvar) +Status: removed +When: 1.18.11 +Warning: program, lintian (substvar-source-version-is-deprecated) +Why: + The semantics of Source-Version were misleading when applied to binNMUs. + Should switch to use binary:Version or source:Version substvars. + . + The code got changed to emit errors. + +What: -Zlzma (dpkg-deb option value) +Status: removed +When: 1.18.11 +Warning: program +Why: + LZMA compression has some format deficiencies fixed by XZ, which is what + upstream has replaced it with, as such there's no point in continuing to + support compressing new .deb files with that format, although unpacking + will be kept being supported to handle existing compressed files. + +What: -Zbzip2 (dpkg-deb option value) +Status: removed +When: 1.18.11 +Warning: program +Why: + bzip2 compression has been superseded by xz when it comes to size, and + gzip is still faster, in Debian there's really not many packages using + that compression, as such there's no point in continuing to support + compressing new .deb files with that format, although unpacking + will be kept being supported to handle existing compressed files. + +What: --new, --old (dpkg-deb options) +Status: removed +When: 1.18.11 +Warning: program +Why: + These options are not future-proof, and do not give the caller any + guarantee of what exact format version will be used to produce the + output file. They were replaced with a new --deb-format option. + +What: --print-installation-architecture (dpkg option) +Status: removed +When: 1.18.11 +Warning: program +Why: + Obsoleted long time ago (2005-01-22). Remaining packages should switch to + use 'dpkg --print-architecture'. + +What: GCJ and GCJFLAGS support +Status: removed +When: 1.22.1 +Why: + GCJ has been dead upstream since 2018. diff --git a/doc/coding-style.txt b/doc/coding-style.txt new file mode 100644 index 0000000..536e5ca --- /dev/null +++ b/doc/coding-style.txt @@ -0,0 +1,336 @@ +Dpkg POD coding style 2021-06-25 +===================== + +General +~~~~~~~ + +Verbatim code sections that need to be formatted, need to be prefixed with +a line containing exactly «Z<>», to trick the parser. + +New sentences inside a paragraph should start on a new line, so that we +do not need to reflow the text when adding new content. + +Every new feature, option or behavior change needs to be documented with +the version introducing the change. + + +Dpkg M4sh/Autoconf coding style 2016-09-05 +=============================== + +General +~~~~~~~ + +All dpkg specific macros need to be prefixed with «DPKG_». Complex checks +should be defined as new macros under m4/dpkg-<name>.m4, and those used +in configure.ac which should look pretty simple. + +Quoting and indentation +~~~~~~~~~~~~~~~~~~~~~~~ + +Code and arguments that wrap into the next line are indented by two spaces. + +In principle all macro argument should always be quoted. Which brings one +of the biggest readability issues with M4sh/Autoconf code, the amount of +consecutive quotes and parenthesis pairs, which can make it very hard to +notice if they are unbalanced. To avoid this we use a style that tries to +avoid more than two consecutive blocks of «])». + +We can either use a style resembling very simple function calls, when the +arguments are as well very simple, such as: + + AC_DEFINE_UNQUOTED([SOME_VARIABLE], + [SOME_CONCOCTED_WAY_TO_GET_A_VALUE], + [Some descriptive text here]) + + AS_CASE([condition], + [case-a], [do-a], + [case-b], [do-b]) + +Or one resembling curly-braced C-style blocks, such as this: + + AS_IF([condition], [ + DO_SOMETHING([here]) + ], [ + DO_OTHERWISE([there]) + ]) + +Except for AC_ARG_WITH, AC_ARG_ENABLE and AM_CONDITIONAL which need their +second argument quoted tightly surrounding the code, like this: + + AC_ARG_ENABLE([feature], + [AS_HELP_STRING([--disable-feature], [Disable feature])], + [], [enable_feature="yes"]) + + AM_CONDITIONAL([HAVE_SOME_FEATURE], + [test "x$ac_cv_have_some_feature" = "xyes" && \ + test "x$ac_cv_have_some_feature" = "xyes"]) + +or the output will get messed up. + + +Dpkg C/C++ coding style 2016-01-29 +======================= + +Standards +~~~~~~~~~ + +The C code base assumes C99, except for the following features: + + - Variable length arrays. + - Mixed declaration and code. + +The C++ code base assumes C++03, plus the following C++11 extension: + + + Null pointer keyword (nullptr). + +The code base assumes a POSIX.1-2008 compatible environment. + +The required features are checked at build time, and it will either use +compatibility code in case the needed extensions are not supported and it +is possible to support them, otherwise it will abort in case a needed one +cannot be used. + +General +~~~~~~~ + +The coding style is a mix of parts from KNF [K] and the Linux CodingStyle [L]. +If in doubt or missing from this file please ask, although files using the +tab based indentation can be considered canon. + + [K] <https://www.freebsd.org/cgi/man.cgi?query=style> + [L] <https://www.kernel.org/doc/Documentation/CodingStyle> + +The code has a mix of an old coding style being phased out and the new +style. New files should use the new style, changes to files with the old +style should switch the code being touched except for the indentation level, +which should be preserved to match (2 spaces). + +Code should generally strive for clarity. Monster functions should be split +into logical and small pieces. + +Variable and function names should be generally descriptive, not needed +for variables commonly used (for example an index inside a loop, etc), +acronyms should only be used if they are widely known externally or +inside the project. The names should separate logical concepts within +with underscores. + +On comments use UTF-8 characters for quotes, copyright symbols, etc. + +On strings in code use simple or double quotes «''» «""». Not the unpaired +ones «`'». Strings marked for translation, should only be fixed if there's +other changes to be done on them, otherwise we get unneeded fuzzies. + + <https://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html> + +Code documentation +~~~~~~~~~~~~~~~~~~ + +Public declarations should be documented using JavaDoc style comments. + +Documentation should always be close to its definition (usually in the .c +or .cc files) and not its declaration, so that when the code changes it's +less likely that they will get out of sync. For data types, macros and +similar where there's only declarations, the documentation will usually +go instead in the header files. + +For enum values and struct members, the documentation should usually be +one-line comments, preceding the item. + +The comment title should be on the second line on its own, and the long +description on its own paragraph. + +Examples: + +/** + * This is the enum title. + */ +enum value_list { + /** Value doing foo. */ + VALUE_A, + /** Value doing bar. */ + VALUE_B, +}; + +/** + * This is the title. + * + * This is the long description extending several lines, explaining in + * detail what this item does. + * + * @param a This is the a parameter. + * @param b This is the b parameter. + * + * @return This is the return value. + */ + +Indentation, alignment and spacing +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Lines should be 80 chars max. Indentation is done with hard tabs (which +should be considered to take 8 spaces width). Aligning with spaces: + +static void +function(void *ptr, int value) +{ + void *ref_ptr = get_ref(ptr); + int ref_value = get_value(ref); + + if (value > 10) + do_something(GLOBAL_MACRO, ptr, value, "some-string", + ref_ptr, ref_value, "other-string", + "extra-string"); +} + +When wrapping, logical operators should be kept on the preceding line: + + if (really_long_variable_to_be_checked_against_a && + really_long_variable_to_be_checked_against_b) + foo(); + +Spaces around operators: + + if (a && (b || c) && c == d) + break; + + a = (b + 4 * (5 - 6)) & 0xff; + +Spaces around assignments: + + a += b; + +Spaces after comma: + + foo(a, b); + +Space after keywords (for, while, do, if, etc, but sizeof should be +treated like a function): + + for (i = 0; i < 10; i++) + foo(i); + + memcpy(dst, src, sizeof(src)); + +Definition of local variables, related code blocks, functions bodies +should be split with blank lines: + +int +function(void) +{ + int a; + + foo(); + bar(); + + quux(); + + return 0; +} + +Braces +~~~~~~ + +Braces should be placed on the same line as the keyword, but on a new line +for the function body. No braces should be used for unambiguous one line +statements: + + if (a > 0) { + foo(a); + bar(a); + } else { + quux(0) + bar(0); + } + + for (;;) { + foo(); + bar(); + } + + do { + foo(); + bar(); + } while (quux()); + + switch (foo) { + case a: + bar(); + break; + case b: + default: + baz(); + break; + } + +Code conventions +~~~~~~~~~~~~~~~~ + +Prefer assigning outside of conditionals: + + n = read_items(); + if (n < 100) + foo(); + +String comparisons should use comparison operators to make it easier to +see what operation is being done: + + if (strcmp(a, b) == 0) + foo(); + + if (strcmp(a, b) < 0) + foo(); + + +Dpkg Perl coding style 2019-03-27 +====================== + +Perl version +~~~~~~~~~~~~ + +We don't want to impose a too-recent Perl version, so only use features +supported by the Perl version that is currently in Debian oldstable when +possible. Currently that means Perl 5.32.1. + +General +~~~~~~~ + +In general you should follow the conventions listed in perlstyle(1). +All the code should run with the “use strict” and “use warnings” pragmas, +and pass «make authorcheck». + +Code documentation +~~~~~~~~~~~~~~~~~~ + +Public modules should be documented with POD (see perlpod(1)). Private +code doesn't have to use POD, simple comment lines (starting with "#") are +enough, but if they use POD they need to note the fact that the module is +private in the CHANGES section and specify a version «0.xx». Public scripts +are documented in their corresponding manual pages. + +Indentation, alignment and spacing +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Lines should be 80 chars max. The indentation level is 4 characters, and +indentation is done with soft tabs (no hard tabs) and spaces. + +if ($foo) { + if ($bar) { + print "Hello\n"; + unless ($baz) { + print "Who are you?\n"; + } + } +} + +Object methods +~~~~~~~~~~~~~~ + +Use a single line to retrieve all the arguments and use $self as name +for the current object: + +sub do_something { + my ($self, $arg1, $arg2, %opts) = @_; + ... +} + +Supplementary optional arguments should be named and thus stored in a +hash. diff --git a/doc/spec/frontend-api.txt b/doc/spec/frontend-api.txt new file mode 100644 index 0000000..5f25741 --- /dev/null +++ b/doc/spec/frontend-api.txt @@ -0,0 +1,30 @@ +Frontend Interfaces +=================== + +Status: recommendation, stable + + +Overview +-------- + +This file will try to document some of the interfaces that dpkg makes +available to frontends or that expects them to use, which are currently +not covered by any other type of documentation. + + +Database Locking +---------------- + +Any frontend needing to make sure no write operation is currently happening, +and no other frontend is running should first acquire the frontend lock at +«<admindir>/lock-frontend», and then acquire the dpkg database lock at +«<admindir>/lock». When the frontend invokes dpkg, it should set the +environment variable DPKG_FRONTEND_LOCKED (to prevent dpkg from acquiring +the frontend lock), and then release the dpkg database lock, which will be +acquired by dpkg itself. This way no other frontend following this protocol +can race to perform operations while another one has one in progress. + +These locks must be file record locks (i.e. fcntl(2) advisory locking), and +the whole file should be locked, as that's the most portable way to perform +this operation; this can be achieved by using start=0, len=0 and +whence=SEEK_SET. diff --git a/doc/spec/protected-field.txt b/doc/spec/protected-field.txt new file mode 100644 index 0000000..90e2441 --- /dev/null +++ b/doc/spec/protected-field.txt @@ -0,0 +1,74 @@ +Support for a Protected field +============================= + +Status: draft, experimental +URL: https://wiki.debian.org/Teams/Dpkg/Spec/ProtectedField + +Summary +------- + +The goal of the following proposal is to standardize a field to split +part of the «Essential» packages, and add support for it in the package +management stack. There is currently an Important field, that has the +correct semantics but has a very confusing name and is only supported +by apt anyway, so this new field would phase out that one. + +Background +---------- + +Our current use of «Essential: yes» is confused, and it includes several +conflated things, some of which would be worth splitting up. + +We use «Essential» to: + + * Denote that a package must be always installed and cannot be + removed (easily), because it is essential to the system in some way. + * Denote that a package must be functional even when just unpacked + (after having been configured once / fully bootstrapped). + * Mark auto-vivification, by making front-ends either complain very + loudly or reinstalling these packages when missing. + * Minimize dependency loops, by making these dependencies implicit. + +One problem is that the first point above includes being essential for +the packaging system during upgrades/installation, for the operation +of the system in general, and for the operation of the system during +boot. + +The latter is not always necessary though, for example within a chroot, +or some types of containers. There has been work on trying to trim down +the pseudo-essential set as can be seen from: + + <https://wiki.debian.org/Proposals/EssentialOnDiet> + <https://wiki.debian.org/BusterPriorityRequalification> + +And several of these switches made use of a pre-existing field called +«Important», defined and currently only supported by apt, which had the +following properties: + + * These packages are not required to be installed. + * They do not have to be usable while unconfigured. + * Dependencies need to be spelled out. + +Proposal +-------- + +The proposal would be to add support for a new Protected field, with the +following properties: + + * Protected packages should not be trivial to remove (require a force + option for example, like «Essential»). + * Protected packages should not be required to be installed (i.e. once + removed they should not be automatically brought back by a front-end, + unlike «Essential»). + * Protected packages must be depended on explicitly (unlike «Essential»). + * Protected packages must be functional even when unpacked (think of + a boot loader or an init system; like «Essential»). [XXX: This one is + not entirely clear and might not match reality anyway, for example kernels, + which might require building an initramfs, etc.] + +This would make it possible to phase out the current «Important» field +usage (because it has a name too confusing relative to the «Priority» +value; and has small tooling coverage) and the usage of «Essential» for +at least packages involved in the boot process, and perhaps also for +packages essential for operation of the system in general (in contrast +to packages required for the packaging system). diff --git a/doc/spec/rootless-builds.txt b/doc/spec/rootless-builds.txt new file mode 100644 index 0000000..5a5af83 --- /dev/null +++ b/doc/spec/rootless-builds.txt @@ -0,0 +1,177 @@ +Supporting rootless builds +========================== + +Status: recommendation, stable +Version: 1.0 + +Background +---------- + +Traditionally, Debian packages have required (fake)root privileges for some +of the "debian/rules" targets. This has required also a split between build +and binary targets; making the builds slower, due to the increased amount +of invocations of "debian/rules" and the overhead of using fakeroot(1) or +equivalent fake environments, or less secure due to the increased dangers +of running under real root via sudo or equivalent. + +On this document when talking about "(fake)root" privileges, it will refer +to any mechanism, supported by the dpkg-buildpackage "-r/--root-command" +option, that can provide either a real or faked root user environment. + +Specification +------------- + +We add a new field to the "Source" stanza of debian/control: + + Rules-Requires-Root: no | binary-targets | <implementations-keywords> + +The case sensitive values are defined as: + + * If "no", then "debian/rules binary" will not require root at all (not even + fakeroot). This is the default in dpkg-build-api level >= 1. + - If the "no" keyword is used, it MUST be the only keyword in that field + and MUST appear exactly once. + + * If "binary-targets", then "debian/rules binary" (etc.) must always be run + under (fake)root. This is the status quo, default in dpkg-build-api level 0. + + * <implementations-keywords> will be a space separated list of keywords which + define when root is required. + + - Keywords consists of <namespace>/<cases>. The "namespace" part cannot + contain "/" or whitespace. The "cases" part cannot contain whitespace. + Furthermore, both parts MUST consist entirely of printable ASCII + characters. + + - Each tool/package will define a namespace named after itself and provide + a number of cases where (fake)root is required. + (See also "Implementation provided keywords".) + + - When "Rules-Requires-Root" is set to <implementations-keywords>, the + builder (i.e. whatever is executing debian/rules) will expose an + interface that is used to run a command under (fake)root via the + "Gain Root API". If the builder cannot provide such a command, it + MUST behave like "Rules-Requires-Root" was set to "binary-targets", + i.e. run "debian/rules binary" under (fake)root. + +When the builder supports this specification, it MUST notify this fact to +the rules file via the "DEB_RULES_REQUIRES_ROOT" environment variable, with +the value it has obtained from the Rules-Requires-Root field or some builder +specific override mechanism, which will denote the level of support the +builder has chosen to commit to take effect during the build. When set, +it MUST be a valid value for the Rules-Requires-Root field. If unset, +the build system SHOULD assume that the builder does not recognize the +Rules-Requires-Root field at all. + +It is always permissible for a builder to ignore this field and fall back to +running the binary targets under (fake)root. This is to ensure backwards +compatibility when builds are performed by legacy builders or older versions +of the tooling. + +Tools called from the rules file MUST cope gracefully with being called under +(fake)root even when Rules-Requires-Root is set to a value that implies they +should not be (e.g. "no"). However, they MUST NOT attempt to run processes +under (fake)root when run as a regular user when Rules-Requires-Root does +not list any keywords they respond to. + +Tools MUST gracefully ignore valid unknown keywords outside their namespace. +They MAY warn about unknown keywords inside their namespace. + +The value of this field MUST NOT change the content of the package in any +way. Notably, packages that are bit-for-bit reproducible MUST still provide +bit-for-bit identical results even when the field is ignored. + +Implementation provided keywords +-------------------------------- + +Keywords provided by various implementations: + + * dpkg/target-subcommand: When the package needs to run a given command + under (fake)root within the "debian/rules" files directly, this MUST be + declared via this keyword. + + * dpkg/target/<target-name>: When a specific "debian/rules" unofficial + target (none of the root-requiring "binary-indep", "binary-arch", "binary", + "clean", nor the non-root-requiring "build-indep", "build-arch", "build") + needs to be run under (fake)root, this MUST be declared via this dynamic + keyword, where <target-name> is the name of the "debian/rules" target. + + * debhelper/upstream-make-install: The dh_auto_install command will run + the "install" target from the upstream's Makefile under (fake)root (for + the "makefile" build system or one derived from it). + +Gain Root API +------------- + +The builder will provide a command to promote a given command to (fake)root +by exposing it in the environment variable "DEB_GAIN_ROOT_CMD". Tools that +need this promotion will then use it like the following: + + $DEB_GAIN_ROOT_CMD cmd-that-needs-root ... + +This command is subject to the same requirements as the "gain-root-command" +that dpkg-buildpackage accepts via its "-r/--root-command" option, which +means that it can contain space-separated parameters. If dpkg-buildpackage is +called with "-r/--root-command", then dpkg-buildpackage shall use that value +as the value for "DEB_GAIN_ROOT_CMD". The command SHOULD preserve all the +environment variables, unmodified. + +The variable SHOULD only be provided when there is a need for it. Notably +when "Rules-Requires-Root" is either "no" or "binary-targets" the variable +SHOULD NOT be defined. + +(The "DEB_GAIN_ROOT_CMD" variable used to be named "DPKG_GAIN_ROOT_CMD" +starting with dpkg 1.19.0 and before dpkg 1.19.1 when this specification +got released as stable. The old name MUST not be used.) + +Common cases +------------ + + * Upstream installation insists on "sudo make install"-like behavior. + => Use dpkg/target-subcommand or debhelper/upstream-make-install. + + * Files shipped in the package must be owned by another user than root. + => Not covered; use "binary-targets" for now until dpkg+debhelper + provides the required interface. + +Prototyping/preparation +======================= + +dpkg side +--------- + +dpkg-deb --build provides the --root-owner-group option so that dh_builddeb +or direct calls can control the owner/group file values w/o requiring +(fake)root. + +dpkg-buildpackage must export DEB_GAIN_ROOT_CMD when necessary (for +prototyping, doing this unconditionally would be fine). + + +debhelper side +-------------- + +When the field is present: + + * dh_testroot will behave as usual when Rules-Requires-Root is not present + or set to "binary-targets". + + * dh_testroot will be a no-op when Rules-Requires-Root is set to "no". + + * Otherwise, dh_testroot will either verify that it is run under (fake)root + (as usual) OR assert that DEB_GAIN_ROOT_CMD is defined. + + * debhelper build systems will be patched to check for the + "debhelper/upstream-make-install" keyword and use the "Gain Root API" + accordingly. + + * All other (src:)debhelper commands will skip their calls to chown + (currently they just reset them to "0:0" anyway). + +With the above, a default "dh $@" will no longer require (fake)root when +built (and Rules-Requires-Root is "no"). + +Prototyping: + + * During prototyping, dh_builddeb can wrap the dpkg-deb --build call with + fakeroot (when not already root). diff --git a/doc/spec/triggers.txt b/doc/spec/triggers.txt new file mode 100644 index 0000000..64f4232 --- /dev/null +++ b/doc/spec/triggers.txt @@ -0,0 +1,818 @@ +Triggers +======== + +Status: recommendation, stable + +Introduction +------------ + +A dpkg trigger is a facility that allows events caused by one package +but of interest to another package to be recorded and aggregated, and +processed later by the interested package. This feature simplifies +various registration and system-update tasks and reduces duplication +of processing. + +(NB: Triggers are intended for events that occur during package +installation, not events that occur in general operation.) + + +Concepts +-------- + +Each trigger is named, and at any time zero or more packages may be +interested in it. + +We currently envisage three kinds of triggers: + * Explicit triggers. These can be activated by any program + by running dpkg-trigger (at any time, but ideally from a maintainer + script). + * File triggers. These are activated automatically by dpkg + when a matching file is installed, upgraded or removed as part + of a package. They may also be explicitly activated by running + dpkg-trigger. + * Future kinds of special triggers, which are activated by magic code + in dpkg itself. Currently none are defined besides file triggers. + +A trigger is always activated by a particular package. + +Trigger names contain only printing 7-bit ASCII characters (no +whitespace). Each trigger kind has a distinct subset of the trigger +name space so that the kind can be determined from the name. After we +run out of straightforward syntaxes, we will use <kind>:<details>. + +When a trigger is activated, it becomes pending for every package +which is interested in the trigger at that time. Each package has a +list of zero or more pending triggers. Repeated activation of the +same trigger has no additional effect. Note that in general a trigger +will not be processed immediately when it is activated; processing is +deferred until it is convenient (as described below). + +At a trigger activation, the interested packages(s) are added to the +triggering package's list of triggers-awaited packages (unless the +trigger has been configured to not require it); the triggering +package is said to await the trigger processing. + +A package which has pending triggers, or which awaits triggers, is not +considered properly installed. There are two new dpkg status values, +‘triggers-pending’ and ‘triggers-awaited’, which lie between +‘config-failed’ and ‘installed’. + + +Details - Overview table +------------------------ + + Status Pending Awaited Satisfies Remedy + triggers triggers Depends + + unpacked never maybe No postinst configure + c.-failed never maybe No postinst configure (when requested) + t.-awaited yes always No postinst triggered + fix awaited pkg(s) + t.-awaited no always No fix awaited package(s) + t.-pending always never Yes postinst triggered + installed never never Yes n/a + +Packages in t-awaited and t-pending demand satisfaction of their +dependencies just like packages in installed. + + +Details - triggering package +---------------------------- + +When a package <T> activates a trigger in which a package <I> is +interested, <I> is added to the list of packages whose trigger +processing is awaited by <T>. Zero or more packages <I> may be added as a +result of any particular trigger activation, depending on how many +packages were interested. (If <T> chooses, explicit trigger activation +using dpkg-trigger of <I> by <T> need not make <T> become triggers-awaited +in this way.) + +A package which awaits trigger processing but would otherwise be +‘installed’ or ‘triggers-pending’ is considered to be in state +‘triggers-awaited’. Packages in ‘triggers-awaited’ do not satisfy +Depends dependencies. + +Every triggered package <I> in <T>'s list of awaited packages either has a +nonempty list of pending triggers, or is in ‘config-failed’ or worse. +When <I> enters ‘installed’ (or ‘config-files’ or ‘not-installed’), the +entry in <T>'s list of awaited packages is removed so that <T> may, if it +no longer awaits any packages, become ‘installed’ or ‘triggers-pending’. + +Packages in ‘config-files’ or ‘not-installed’ do not await triggers. + + +Details - triggered package +--------------------------- + +When one of the triggers in which a package is interested is +activated, the triggered package has the trigger added to its list of +pending triggers. Packages with a nonempty list of pending triggers +which would otherwise be in state ‘installed’ are in state +‘triggers-pending’ instead, so if the package was previously +‘installed’ it becomes ‘triggers-pending’. + +If a package has nonempty lists both of pending and awaited triggers, +then it is in ‘triggers-awaited’. Nevertheless efforts will still be +made to process its triggers so as to make the list of pending +triggers empty. + +To restore a package in state ‘triggers-pending’ to ‘installed’, or to +process pending triggers of a package with both pending and awaited +triggers, dpkg will run the postinst script as: + + postinst triggered "<trigger-name> <trigger-name> ..." + +by passing a space-separated list of <trigger-name>s as the second argument. + +This will be attempted for each relevant package at the end of each +dpkg run; so, normally, in the same dpkg run as the event which made +the package go to ‘triggers-pending’. This leaves packages in +reasonable states by default. + +If the “postinst triggered” run fails the package goes to +‘config-failed’, so that the trigger processing will not be attempted +again until explicitly requested. + + + │ + v + ┌────────────┐ + │ unpacked │ + └─────┬──────┘ + │ + │ + (automatic)│ ┌───────────────┐ + │ │ config-failed │ + │ └─────┬─────────┘ + │ │ ^ + │ │ │ + ├──────<─────┘ │ ┌──────────────────────────────────┐ + │ (user request) │ │ triggers-pending │ + postinst │ │ │ or │ + "configure" │ │ │ triggers-awaited w/ some pending │ + │ │ └────────────┬─────────────────────┘ + │ │ │ ^ + ├────────>───────┤ postinst │ │ + │ error │ "triggered" │ │ + │ │ (automatic) │ │ + │ │ │ │ trigger(s) + │ │ │ │ activated + │ └────────<─────────┤ │ + │ error │ │ + │ │ │ + v v │ + ┌──────────────────────────────────────────────┴────┐ + │ installed or triggers-awaited w/ none pending │ + └───────────────────────────────────────────────────┘ + +Packages in ‘config-failed’ or worse are never considered to have +lists of pending triggers. A package whose postinst is being run +can however acquire pending triggers during that run (ie, a package +can trigger itself). + +This means that if a triggering package <T> awaits trigger processing by +an interested package <I>, and <I> goes to ‘config-failed’ or worse (eg, +during unpack for upgrade), then when <I> is reconfigured (goes to +‘installed’) or removed, <T> will no longer await processing by <I>, so +that <T> may automatically go from ‘triggers-awaited’ to ‘installed’. + +Or to put it another way, triggered actions are considered irrelevant +if the interested package <I> is not configured. When <I>'s postinst is +called with ‘configure’, it must do whatever actions are necessary to +deal with any trigger activations which might have occurred while it +was not configured, just as if the package was being configured for +the first time. + +Trigger processing should be idempotent. The list of triggers being +processed is provided to the postinst only so that it can optimize +away redundant processing. + +In that case, where an interested package has more than one trigger +and wants to process them differently, the list of triggers can be can +be examined in a shell script like this: + case " $2 " in + *" trigger-name-a "*) process-trigger-a ;; + esac +Generally each trigger name should be tested for separately, as the +postinst will often be called for several triggers at once. + +Note that if a package both activates triggers in other packages, and +is interested in triggers of its own, its postinst may run for trigger +processing before the postinst(s) of the package(s) it has triggered. + + +Timing guarantees, races, etc. +------------------------------ + +Activating a trigger will not have any immediate effect, although +putative resulting status changes will show up in dpkg --status etc. +(Putative because the actual status changes may depend on the state of +trigger interests when dpkg processes the trigger activation into +the status database, rather than that when dpkg --status is run.) + +A package is only guaranteed to become notified of a trigger +activation if it is continuously interested in the trigger, and never +in ‘config-failed’ or worse, during the period from when the trigger +is activated until dpkg runs the package postinst (either due to +--configure --pending, or at the end of the relevant run, as described +above). Subsequent to activation and before notification, the +interested package will not be considered in state ‘installed’, so +long as the package remains interested, and the triggering package +will not be considered ‘installed’. + +If the package is not in state ‘installed’, ‘triggers-pending’ or +‘triggers-awaited’ then pending triggers are not accumulated. +However, if such a package (between ‘half-installed’ and +‘config-failed’ inclusive) declares some trigger interests then the +triggering packages *will* await their configuration (which implies +completion of any necessary trigger processing) or removal. + +It is not defined in what order triggers will run. dpkg will make +some effort to minimize redundant work in the case where many packages +have postinst trigger processing activating another package's triggers +(for example, by processing triggers in fifo order during a single +dpkg run). Cycles in the triggering graph are prohibited and will +eventually, perhaps after some looping, be detected by dpkg and cause +trigger processing to fail; when this happens one of the packages +involved will be put in state ‘config-failed’ so that the trigger loop +will not be reattempted. See “Cycle detection” below. + + +Explicit triggers +----------------- + +Explicit triggers have names with the same syntax as package names, +*but* should *not* normally be named identically to a package. + +When choosing an explicit trigger name it is usually good to include a +relevant package name or some other useful identifier to help make the +trigger name unique. On the other hand, explicit triggers should +generally not be renamed just because the interested or triggering +packages' names change. + +Explicit trigger names form part of the interface between packages. +Therefore in case of wider use of any trigger the name and purpose +should be discussed in the usual way and documented in the appropriate +packaging guidelines (eg, in the distribution policy). + + +File triggers +------------- + +File triggers have names of the form + /path/to/directory/or/file +and are activated when the specified filesystem object, or any object +under the specified subdirectory, is created, updated or deleted by +dpkg during package unpack or removal. The pathname must be absolute. + +File triggers should not generally be used without mutual consent. +The use of a file trigger, and the name of the trigger used, should be +stated in the distribution policy, so that a package which creates a +relevant file in a maintainer script can activate the trigger explicitly. + +File triggers must definitely not be used as an escalation tool in +disagreements between different packages as to the desired contents of +the filesystem. Trigger activation due to a particular file should +not generally modify that file again. + +Configuration files (whether dpkg-handled conffiles or not), or any +other files which are modified at times other than package management, +should not rely on file triggers detecting all modifications; dpkg +triggers are not a general mechanism for filesystem monitoring. + +If there are or might be directory symlinks which result in packages +referring to files by different names, then to be sure of activation +all of the paths which might be included in packages should be listed. +The path specified by the interested package is matched against the +path included in the triggering package, not against the truename of +the file as installed. Only textually identical filenames (or +filenames where the interest is a directory prefix of the installed +file) are guaranteed to match. + +A file trigger is guaranteed to be activated before the file in +question is modified by dpkg; on the other hand, a file trigger might +be activated even though no file was actually modified. Changes made +by dpkg to the link count of a file, or to solely the inode number +(ie, if dpkg atomically replaces it with another identical file), are +not guaranteed to cause trigger activation. + +Because of the restriction on trigger names, it is not possible to +declare a file trigger for a directory whose name contains whitespace, +i18n characters, etc. Such a trigger should not be necessary. + + +Package declarations regarding triggers +--------------------------------------- + +See deb-triggers(5). + +Support future extension of the trigger name syntax with additional +dpkg-generated triggers is as follows: a package which is interested +in any unsupported trigger kinds cannot be configured (since such a +package cannot be guaranteed to have these triggers properly activated +by dpkg). Therefore no package can be interested in any unsupported +trigger kinds and they can be freely activated (both by ‘activate’ and +by dpkg-trigger). dpkg-deb will be changed to warn about unrecognized +trigger names syntaxes and unrecognized trigger control directives. + + +New command line interfaces to dpkg tools +----------------------------------------- + +See dpkg(1). + +Here is a summary of the behaviors: + + Command line Trigproc Trigproc Configure + these any triggered + ----------------------+---------------+---------------+----------------- + --unpack no usually[1] none + --remove n/a usually[1] none + --install n/a usually[1] these + --configure -a any needed usually[1] any needed + --configure <some> if needed usually[1] must, or trigproc + --triggers-only -a any needed usually[1] none + --triggers-only <some> must usually not[1] none + + [1] can be specified explicitly by --triggers or --no-triggers + + +See dpkg-trigger(1). + +A trigger may be activated explicitly with: + dpkg-trigger [--by-package <package>] <name-of-trigger> + dpkg-trigger --no-await <name-of-trigger> + +There will be no output to stdout, and none to stderr unless +dpkg-trigger is unable to make a record of the trigger activation. + +NB that in the case of a file trigger the name of the trigger is +needed, not the name of a file which would match the trigger. + + +apt and aptitude +---------------- + +These must be taught about the new ‘triggers-awaited’ and +‘triggers-pending’ states. Packages in these states should be treated +roughly like those in ‘unpacked’: the remedy is to run dpkg +--configure. + +Normally apt and aptitude will not see packages in ‘triggers-pending’ +since dpkg will generally attempt to run the triggers thus leaving the +package in ‘config-failed’ or ‘installed’. + +Note that automatic package management tools which call dpkg (like apt +and aptitude) should not attempt to configure individual packages in +state ‘triggers-pending’ (or indeed ‘triggers-awaited’) with dpkg +--triggers-only <package>... or dpkg --no-triggers --configure <package>..., +or similar approaches. This might defeat dpkg's trigger cycle detection. + +A package management tool which will run dpkg --configure --pending at +the end may use --no-triggers on its other dpkg runs. This would be +more efficient as it allows more aggressive deferral (and hence more +unification) of trigger processing. + + +Error handling +-------------- + +Packages should be written so that they DO NOT BREAK just because +their pending triggers have not yet been run. It is allowed for the +functionality relating to the unprocessed trigger to fail (ie, the +package which is awaiting the trigger processing may be broken), but +the remainder of the interested package must work normally. + +For example, a package which uses file triggers to register addons +must cope with (a) an addon being dropped into the filesystem but not +yet registered and (b) an addon being removed but not yet +deregistered. In both of these cases the package's main functionality +must continue to work normally; failure of the addon in question is +expected, warning messages are tolerable, but complete failure of the +whole package, or failures of other addons, are not acceptable. + +dpkg cannot ensure that triggers are run in a timely enough manner for +pathological error behaviors to be tolerable. + + +Where a trigger script finds bad data provided by a triggering +package, it should generally report to stderr the problem with the bad +data and exit nonzero, leaving the interested package in config-failed +and the triggering package in triggers-awaited and thus signalling the +problem to the user. + +Alternatively, in some situations it may be more desirable to allow +the interested package to be configured even though it can only +provide partial service. In this case clear information will have to +be given in appropriate places about the missing functionality, and a +record should be made of the cause of the errors. This option is +recommended for situations where the coupling between the interested +and triggering package is particularly loose; an example of such a +loose coupling would be Python modules. + + + +WORKED EXAMPLE - SCROLLKEEPER +============================= + +Currently, every Gnome program which comes with some help installs the +help files in /usr/share/gnome/help and then in the postinst runs +scrollkeeper-update. scrollkeeper-update reads, parses and rewrites +some large xml files in /var/lib/scrollkeeper; currently this +occurs at every relevant package installation, upgrade or removal. + +When triggers are available, this will work as follows: + + * gnome-foobar will ship its «omf» file in /usr/share/omf as + normal, but will not contain any special machinery to invoke + scrollkeeper. + + * scrollkeeper will in its triggers control file say: + interest /usr/share/omf + and in its postinst say: + scrollkeeper-update-now -q + + dpkg will arrange that this is run once at the end of each run + where any documentation was updated. + + Note that it is not necessary to execute this only on particular + postinst "$1" values; however, at the time of writing, scrollkeeper + does this: + + if [ "$1" = "configure" ]; then + printf "Rebuilding the database. This may take some time.\n" + scrollkeeper-rebuilddb -q + fi + + and to retain this behavior, something along the following lines + would be sensible: + + if [ "$1" = "configure" ]; then + printf "Rebuilding the database. This may take some time.\n" + scrollkeeper-rebuilddb -q + else + printf "Updating GNOME help database.\n" + scrollkeeper-update-now -q + fi + + * dh_scrollkeeper will only adjust the DTD declarations and no longer + edit maintainer scripts. + + +Full implementation of the transition plan defined below, for +scrollkeeper, goes like this: + + 1. Update scrollkeeper: + - Add a ‘triggers’ control archive file containing + interest /usr/share/omf + - Make the postinst modifications as described above. + - Rename scrollkeeper-update to scrollkeeper-update-now + - Provide a new wrapper script as scrollkeeper-update: + #!/bin/sh + set -e + if type dpkg-trigger >/dev/null 2>&1 && \ + dpkg-trigger /usr/share/omf; then + exit 0 + fi + exec scrollkeeper-update-now "$@" + + 2. In gnome-policy chapter 2, “Use of scrollkeeper”, + - delete the requirement that the package must depend on + scrollkeeper + - delete the requirement that the package must invoke + scrollkeeper in the postinst and postrm + - instead say: + + OMF files should be installed under /usr/share/omf in the + usual way. A dpkg trigger is used to arrange to update the + scrollkeeper documentation index automatically and no special + care need be taken in packages which supply OMFs. + + If an OMF file is placed, modified or removed other than as + a file installed in the ordinary way by dpkg, the dpkg file + trigger «/usr/share/omf» should be activated; see the dpkg + triggers specification for details. + + Existing packages which Depend on scrollkeeper (>= 3.8) + because of dh_scrollkeeper or explicit calls to + scrollkeeper-update should be modified not to Depend on + scrollkeeper. + + 3. Update debhelper's dh_scrollkeeper not to edit maintainer + scripts. One of dh_scrollkeeper or lintian should be changed to + issue a warning for packages with scrollkeeper (>= 3.8) in the + Depends control file line. + + 4. Remove the spurious dependencies on scrollkeeper, at our leisure. + As a bonus, after this is complete it will be possible to remove + scrollkeeper while keeping all of the documentation-supplying + gnome packages installed. + + 5. If there are any packages which do by hand what dh_scrollkeeper + does, change them not to call scrollkeeper-update and drop + their dependency on scrollkeeper. + +This is not 100% in keeping with the full transition plan defined +below: if a new gnome package is used with an old scrollkeeper, there +is some possibility that the help will not properly be available. + +Unfortunately, dh_scrollkeeper doesn't generate the scrollkeeper +dependency in the control file, which makes it excessively hard to get +the dependency up to date. The bad consequences of the inaccurate +dependencies are less severe than the contortions which would be +required to deal with the problem. + + +TRANSITION PLAN +=============== + + +Old dpkg to new dpkg +-------------------- + +The first time a trigger-supporting dpkg is run on any system, it will +activate all triggers in which anyone is interested, immediately. + +These trigger activations will not be processed in the same dpkg run, +to avoid unexpectedly processing triggers while attempting an +unrelated operation. dpkg --configure --pending (and not other dpkg +operations) will run the triggers, and the dpkg postinst will warn the +user about the need to run it (if this deferred triggers condition +exists). (Any triggers activated or reactivated *after* this +mass-activation will be processed in the normal way.) + +To use this correctly: + * Packages which are interested in triggers, or which want to + explicitly activate triggers, should Depend on the + triggers-supporting version of dpkg. + * Update instructions and tools should arrange to run + dpkg --configure --pending + after the install; this will process the pending triggers. + +dpkg's prerm will check for attempts to downgrade while triggers are +pending and refuse. (Since the new dpkg would be installed but then +refuse to read the status file.) In case this is necessary a separate +tool will be provided which will: + * Put all packages with any pending triggers into state + ‘config-failed’ and remove the list of pending triggers. + * Remove the list of awaited triggers from every package. This + may cause packages to go from ‘triggers-awaited’ to ‘installed’ + which is not 100% accurate but the best that can be done. + * Remove /var/lib/dpkg/triggers (to put the situation to that which + we would have seen if the trigger-supporting dpkg had never been + installed). + + +Higher-level programs +--------------------- + +The new dpkg will declare versioned Conflicts against apt and aptitude +and other critical package management tools which will be broken by +the new Status field values. Therefore, the new higher-level tools +will have to be deployed first. + +The new dpkg will declare versioned Breaks against any known +noncritical package management tools which will be broken by the new +Status field value. + + +Transition hints for existing packages +-------------------------------------- + +When a central (consumer) package defines a directory where other leaf +(producer) packages may place files and/or directories, and currently +the producer packages are required to run an «update-consumer» script +in their postinst: + 1. In the relevant policy, define a trigger name which is the name of + the directory where the individual files are placed by producer + packages. + 2. Update the consumer package: + * Declare an interest in the trigger. + * Edit «update-consumer» so that if it is called without --real + it does the following: + if type dpkg-trigger >/dev/null 2>&1 && \ + dpkg-trigger name-of-trigger; then + exit 0 + fi + If this fails to cause «update-consumer» to exit, it should do + its normal update processing. Alternatively, if it is more + convenient, «update-consumer» could be renamed and supplanted with + a wrapper script which conditionally runs the real + «update-consumer». + * In the postinst, arrange for the new ‘triggered’ invocation to + run «update-consumer --real». The consumer package's postinst + will already run «update-consumer» during configuration, and this + should be retained and supplemented with the --real option (or + changed to call the real script rather than the wrapper). + 3. Update the producer packages: + * In the postinst, remove the call to «update-consumer». + * Change the dependency on consumer to be versioned, specifying a + trigger-interested consumer. + This can be done at our leisure. Ideally for loosely coupled + packages this would be done only in the release after the one + containing the triggers-interested consumer, to facilitate partial + upgrades and backports. + 4. After all producer packages have been updated according to step 3, + «update-consumer» has become an interface internal to the consumer + and need no longer be kept stable. If un-updated producers are + still of interest, incompatible changes to «update-consumer» imply + a versioned Breaks against the old producers. +(See also “Transition plan”, below.) + +If there are several consumer packages all of which are interested in +the features provided by producer packages, the current arrangements +usually involve an additional central switchboard package (eg, +emacsen-common). In this case: + + -- NOTE - this part of the transition plan is still a proof of + concept and we might yet improve on it + + 1. Define the trigger name. + 2. Update the switchboard to have any new functionality needed by the + consumers in step 3 (2nd bullet). + 3. Update the consumer packages: + * Declare an interest in the trigger. + * In the postinst, arrange for the new ‘trigger’ invocation to run + the compilation/registration process. This may involve scanning + for new or removed producers, and may involve new common + functionality from the switchboard (in which case a versioned + Depends is needed). + * The old interface allowing the switchboard to run + compilation/registration should be preserved, including + calls to the switchboard to register this consumer. + 4. When all consumers have been updated, update the switchboard: + * Make the registration scripts called by producers try to + activate the trigger and if that succeeds quit without + doing any work (as for bullet 2 in the simple case above). + * Versioned Breaks, against the old (pre-step-3) consumers. + 5. After the switchboard has been updated, producers can be updated: + * Remove the calls to the switchboard registration/compilation + functions. + * Change the dependency on the switchboard to a versioned one, + specifying the one which Breaks old consumers. Alternatively, + it may be the case that the switchboard is no longer needed (or + not needed for this producer), in which case the dependency on + the switchboard can be removed in favour of an appropriate + versioned Breaks (probably, identical to that in the new + switchboard). + 6. After all the producers have been updated, the cruft in the + consumers can go away: + * Remove the calls to the switchboard's registration system. + * Versioned Breaks against old switchboards, or versioned Depends + on new switchboards, depending on whether the switchboard is + still needed for other common functionality. + 7. After all of the producers and consumers have been updated, the + cruft in the switchboard can go away: + * Remove the switchboard's registration system (but not obviously + the common functionality from step 3, discussed above). + * Versioned Breaks against pre-step-6 consumers and pre-step-5 + producers. + + +DISCUSSION +========== + +The activation of a trigger does not record details of the activating +event. For example, file triggers do not inform the package of the +filename. In the future this might be added as an additional feature, +but there are some problems with this. + + +Broken producer packages, and error reporting +--------------------------------------------- + +Often trigger processing will involve a central package registering, +compiling or generally parsing some data provided by a leaf package. + +If the central package finds problems with the leaf package data it is +usually more correct for only the individual leaf package to be +recorded as not properly installed. There is not currently any way to +do this and there are no plans to provide one. + +The naive approach of giving the postinst a list of the triggering +packages does not work because this information is not recorded in the +right way (it might suffer from lacunae); enhancing the bookkeeping +for this to work would be possible but it is far better simply to make +the system more idempotent. See above for the recommended approach. + + + + +INTERNALS +========= + +On-disk state +------------- + +A single file /var/lib/dpkg/triggers/File lists all of the filename +trigger interests in the form + /path/to/directory/or/file package + +For each explicit trigger in which any package is interested, +a file /var/lib/dpkg/triggers/<name-of-trigger> is a list of +the interested packages, one per line. + +These interest files are not updated to remove a package just because +a state change causes it not to be interested in any triggers any more +- they are updated when we remove or unpack. + +For each package which has pending triggers, the status file contains +a Triggers-Pending field which contains the space-separated names of +the pending triggers. For each package which awaits triggers the +status file contains a Triggers-Awaited field which contains the +*package* names of the packages whose trigger processing is awaited. +See “Details - Overview table” above for the invariants which relate +Triggers-Pending, Triggers-Awaited, and Status. + +During dpkg's execution, /var/lib/dpkg/triggers/Unincorp is a list of +the triggers which have been requested by dpkg-trigger but not yet +incorporated in the status file. Each line is a trigger name followed +by one or more triggering package names. The triggering package name +"-" is used to indicate one or more package(s) which did not need to +await the trigger. + +/var/lib/dpkg/triggers/Lock is the fcntl lockfile for the trigger +system. Processes hang onto this lock only briefly: dpkg-trigger +to add new activations, or dpkg to incorporate activations (and +perhaps when it updates interests). Therefore this lock is always +acquired with F_GETLKW so as to serialize rather than fail on +contention. + + +Processing +---------- + +dpkg-trigger updates triggers/Unincorp, and does not read or write the +status file or take out the dpkg status lock. dpkg (and dpkg-query) +reads triggers/Unincorp after reading /var/lib/dpkg/status, and after +running a maintainer script. If the status database is opened for +writing then the data from Unincorp is moved to updates as +Triggers-Pending and Triggers-Awaited entries and corresponding Status +changes. + +This means that dpkg is guaranteed to reincorporate pending trigger +information into the status file only 1. when a maintainer script has +finished, or 2. when dpkg starts up with a view to performing some +operation. + +When a package is unpacked or removed, its triggers control file will +be parsed and /var/lib/dpkg/triggers/* updated accordingly. + +Triggers are run as part of configuration. dpkg will try to first +configure all packages which do not depend on packages which are +awaiting triggers, and then run triggers one package at a time in the +hope of making useful progress. (This will involve a new ‘dependtry’ +level in configure.c's algorithm.) The only constraint on the +ordering of postinsts is only the normal Depends constraint, so the +usual Depends cycle breaking will function properly. See “Cycle +detection” below regarding cycles in the “A triggers B” relation. + + +Processing - Transitional +------------------------- + +The case where a triggers-supporting dpkg is run for the first time is +detected by the absence of /var/lib/dpkg/triggers/Unincorp. When the +triggers-supporting dpkg starts up without this it will set each +package's list of pending triggers equal to its interests (obviously +only for packages which are in ‘installed’ or ‘triggers-pending’). +This may result in a package going from ‘installed’ to +‘triggers-pending’ but it will not create the directory at this time. +Packages marked as triggers-pending in this way will not be scheduled +for trigger processing in this dpkg run. + +dpkg will also at this time create /var/lib/dpkg/triggers if +necessary, triggers/File, triggers/Unincorp, and the per-trigger +package lists in /var/lib/dpkg/triggers/<trigger-name>, so that future +trigger activations will be processed properly. + +Only dpkg may create /var/lib/dpkg/triggers and only when it is +holding the overall dpkg status lock. + +dpkg and/or dpkg-deb will be made to reject packages containing +Triggers-Pending and Triggers-Awaited control file fields, to prevent +accidents. + + +Cycle detection +--------------- + +In addition to dependency cycles, triggers raise the possibility of +mutually triggering packages - a cycle detectable only dynamically, +which we will call a “trigger cycle”. + +Trigger cycles are detected using the usual hare-and-tortoise +approach. Each time after dpkg runs a postinst for triggers, dpkg +records the set of pending triggers (ie, the set of activated <pending +package, trigger name> tuples). If the hare set is a superset of the +tortoise set, a cycle has been found. + +For guaranteed termination, it would be sufficient to declare a cycle +only when the two sets are identical, but because of the requirement +to make progress we can cut this short. Formally, there is supposed +to be a complete ordering of pending trigger sets satisfying the +condition that any set of pending triggers is (strictly) greater than +all its (strict) subsets. Trigger processing is supposed to +monotonically decrease the set in this ordering. (The set elements +are <package, trigger name> tuples.) + +(See “Processing” above for discussion of dependency cycles.) |