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Diffstat (limited to 'config.h')
| -rw-r--r-- | config.h | 650 |
1 files changed, 650 insertions, 0 deletions
diff --git a/config.h b/config.h new file mode 100644 index 0000000..ef9eade --- /dev/null +++ b/config.h @@ -0,0 +1,650 @@ +#ifndef CONFIG_H +#define CONFIG_H + +#include "hashmap.h" +#include "string-list.h" + + +/** + * The config API gives callers a way to access Git configuration files + * (and files which have the same syntax). + * + * General Usage + * ------------- + * + * Config files are parsed linearly, and each variable found is passed to a + * caller-provided callback function. The callback function is responsible + * for any actions to be taken on the config option, and is free to ignore + * some options. It is not uncommon for the configuration to be parsed + * several times during the run of a Git program, with different callbacks + * picking out different variables useful to themselves. + */ + +struct object_id; + +/* git_config_parse_key() returns these negated: */ +#define CONFIG_INVALID_KEY 1 +#define CONFIG_NO_SECTION_OR_NAME 2 +/* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */ +#define CONFIG_NO_LOCK -1 +#define CONFIG_INVALID_FILE 3 +#define CONFIG_NO_WRITE 4 +#define CONFIG_NOTHING_SET 5 +#define CONFIG_INVALID_PATTERN 6 +#define CONFIG_GENERIC_ERROR 7 + +#define CONFIG_REGEX_NONE ((void *)1) + +enum config_scope { + CONFIG_SCOPE_UNKNOWN = 0, + CONFIG_SCOPE_SYSTEM, + CONFIG_SCOPE_GLOBAL, + CONFIG_SCOPE_LOCAL, + CONFIG_SCOPE_WORKTREE, + CONFIG_SCOPE_COMMAND, + CONFIG_SCOPE_SUBMODULE, +}; +const char *config_scope_name(enum config_scope scope); + +struct git_config_source { + unsigned int use_stdin:1; + const char *file; + /* The repository if blob is not NULL; leave blank for the_repository */ + struct repository *repo; + const char *blob; + enum config_scope scope; +}; + +enum config_origin_type { + CONFIG_ORIGIN_BLOB, + CONFIG_ORIGIN_FILE, + CONFIG_ORIGIN_STDIN, + CONFIG_ORIGIN_SUBMODULE_BLOB, + CONFIG_ORIGIN_CMDLINE +}; + +enum config_event_t { + CONFIG_EVENT_SECTION, + CONFIG_EVENT_ENTRY, + CONFIG_EVENT_WHITESPACE, + CONFIG_EVENT_COMMENT, + CONFIG_EVENT_EOF, + CONFIG_EVENT_ERROR +}; + +/* + * The parser event function (if not NULL) is called with the event type and + * the begin/end offsets of the parsed elements. + * + * Note: for CONFIG_EVENT_ENTRY (i.e. config variables), the trailing newline + * character is considered part of the element. + */ +typedef int (*config_parser_event_fn_t)(enum config_event_t type, + size_t begin_offset, size_t end_offset, + void *event_fn_data); + +struct config_options { + unsigned int respect_includes : 1; + unsigned int ignore_repo : 1; + unsigned int ignore_worktree : 1; + unsigned int ignore_cmdline : 1; + unsigned int system_gently : 1; + + /* + * For internal use. Include all includeif.hasremoteurl paths without + * checking if the repo has that remote URL, and when doing so, verify + * that files included in this way do not configure any remote URLs + * themselves. + */ + unsigned int unconditional_remote_url : 1; + + const char *commondir; + const char *git_dir; + config_parser_event_fn_t event_fn; + void *event_fn_data; + enum config_error_action { + CONFIG_ERROR_UNSET = 0, /* use source-specific default */ + CONFIG_ERROR_DIE, /* die() on error */ + CONFIG_ERROR_ERROR, /* error() on error, return -1 */ + CONFIG_ERROR_SILENT, /* return -1 */ + } error_action; +}; + +/** + * A config callback function takes three parameters: + * + * - the name of the parsed variable. This is in canonical "flat" form: the + * section, subsection, and variable segments will be separated by dots, + * and the section and variable segments will be all lowercase. E.g., + * `core.ignorecase`, `diff.SomeType.textconv`. + * + * - the value of the found variable, as a string. If the variable had no + * value specified, the value will be NULL (typically this means it + * should be interpreted as boolean true). + * + * - a void pointer passed in by the caller of the config API; this can + * contain callback-specific data + * + * A config callback should return 0 for success, or -1 if the variable + * could not be parsed properly. + */ +typedef int (*config_fn_t)(const char *, const char *, void *); + +int git_default_config(const char *, const char *, void *); + +/** + * Read a specific file in git-config format. + * This function takes the same callback and data parameters as `git_config`. + * + * Unlike git_config(), this function does not respect includes. + */ +int git_config_from_file(config_fn_t fn, const char *, void *); + +int git_config_from_file_with_options(config_fn_t fn, const char *, + void *, + const struct config_options *); +int git_config_from_mem(config_fn_t fn, + const enum config_origin_type, + const char *name, + const char *buf, size_t len, + void *data, const struct config_options *opts); +int git_config_from_blob_oid(config_fn_t fn, const char *name, + struct repository *repo, + const struct object_id *oid, void *data); +void git_config_push_parameter(const char *text); +void git_config_push_env(const char *spec); +int git_config_from_parameters(config_fn_t fn, void *data); +void read_early_config(config_fn_t cb, void *data); +void read_very_early_config(config_fn_t cb, void *data); + +/** + * Most programs will simply want to look up variables in all config files + * that Git knows about, using the normal precedence rules. To do this, + * call `git_config` with a callback function and void data pointer. + * + * `git_config` will read all config sources in order of increasing + * priority. Thus a callback should typically overwrite previously-seen + * entries with new ones (e.g., if both the user-wide `~/.gitconfig` and + * repo-specific `.git/config` contain `color.ui`, the config machinery + * will first feed the user-wide one to the callback, and then the + * repo-specific one; by overwriting, the higher-priority repo-specific + * value is left at the end). + * + * Unlike git_config_from_file(), this function respects includes. + */ +void git_config(config_fn_t fn, void *); + +/** + * Lets the caller examine config while adjusting some of the default + * behavior of `git_config`. It should almost never be used by "regular" + * Git code that is looking up configuration variables. + * It is intended for advanced callers like `git-config`, which are + * intentionally tweaking the normal config-lookup process. + * It takes two extra parameters: + * + * - `config_source` + * If this parameter is non-NULL, it specifies the source to parse for + * configuration, rather than looking in the usual files. See `struct + * git_config_source` in `config.h` for details. Regular `git_config` defaults + * to `NULL`. + * + * - `opts` + * Specify options to adjust the behavior of parsing config files. See `struct + * config_options` in `config.h` for details. As an example: regular `git_config` + * sets `opts.respect_includes` to `1` by default. + */ +int config_with_options(config_fn_t fn, void *, + struct git_config_source *config_source, + const struct config_options *opts); + +/** + * Value Parsing Helpers + * --------------------- + * + * The following helper functions aid in parsing string values + */ + +int git_parse_ssize_t(const char *, ssize_t *); +int git_parse_ulong(const char *, unsigned long *); +int git_parse_int(const char *value, int *ret); + +/** + * Same as `git_config_bool`, except that it returns -1 on error rather + * than dying. + */ +int git_parse_maybe_bool(const char *); + +/** + * Parse the string to an integer, including unit factors. Dies on error; + * otherwise, returns the parsed result. + */ +int git_config_int(const char *, const char *); + +int64_t git_config_int64(const char *, const char *); + +/** + * Identical to `git_config_int`, but for unsigned longs. + */ +unsigned long git_config_ulong(const char *, const char *); + +ssize_t git_config_ssize_t(const char *, const char *); + +/** + * Same as `git_config_bool`, except that integers are returned as-is, and + * an `is_bool` flag is unset. + */ +int git_config_bool_or_int(const char *, const char *, int *); + +/** + * Parse a string into a boolean value, respecting keywords like "true" and + * "false". Integer values are converted into true/false values (when they + * are non-zero or zero, respectively). Other values cause a die(). If + * parsing is successful, the return value is the result. + */ +int git_config_bool(const char *, const char *); + +/** + * Allocates and copies the value string into the `dest` parameter; if no + * string is given, prints an error message and returns -1. + */ +int git_config_string(const char **, const char *, const char *); + +/** + * Similar to `git_config_string`, but expands `~` or `~user` into the + * user's home directory when found at the beginning of the path. + */ +int git_config_pathname(const char **, const char *, const char *); + +int git_config_expiry_date(timestamp_t *, const char *, const char *); +int git_config_color(char *, const char *, const char *); +int git_config_set_in_file_gently(const char *, const char *, const char *); + +/** + * write config values to a specific config file, takes a key/value pair as + * parameter. + */ +void git_config_set_in_file(const char *, const char *, const char *); + +int git_config_set_gently(const char *, const char *); + +/** + * Write a config value that should apply to the current worktree. If + * extensions.worktreeConfig is enabled, then the write will happen in the + * current worktree's config. Otherwise, write to the common config file. + */ +int repo_config_set_worktree_gently(struct repository *, const char *, const char *); + +/** + * write config values to `.git/config`, takes a key/value pair as parameter. + */ +void git_config_set(const char *, const char *); + +int git_config_parse_key(const char *, char **, size_t *); + +/* + * The following macros specify flag bits that alter the behavior + * of the git_config_set_multivar*() methods. + */ + +/* + * When CONFIG_FLAGS_MULTI_REPLACE is specified, all matching key/values + * are removed before a single new pair is written. If the flag is not + * present, then set operations replace only the first match. + */ +#define CONFIG_FLAGS_MULTI_REPLACE (1 << 0) + +/* + * When CONFIG_FLAGS_FIXED_VALUE is specified, match key/value pairs + * by string comparison (not regex match) to the provided value_pattern + * parameter. + */ +#define CONFIG_FLAGS_FIXED_VALUE (1 << 1) + +int git_config_set_multivar_gently(const char *, const char *, const char *, unsigned); +void git_config_set_multivar(const char *, const char *, const char *, unsigned); +int repo_config_set_multivar_gently(struct repository *, const char *, const char *, const char *, unsigned); +int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, unsigned); + +/** + * takes four parameters: + * + * - the name of the file, as a string, to which key/value pairs will be written. + * + * - the name of key, as a string. This is in canonical "flat" form: the section, + * subsection, and variable segments will be separated by dots, and the section + * and variable segments will be all lowercase. + * E.g., `core.ignorecase`, `diff.SomeType.textconv`. + * + * - the value of the variable, as a string. If value is equal to NULL, it will + * remove the matching key from the config file. + * + * - the value regex, as a string. It will disregard key/value pairs where value + * does not match. + * + * - a flags value with bits corresponding to the CONFIG_FLAG_* macros. + * + * It returns 0 on success. + */ +void git_config_set_multivar_in_file(const char *config_filename, + const char *key, + const char *value, + const char *value_pattern, + unsigned flags); + +/** + * rename or remove sections in the config file + * parameters `old_name` and `new_name` + * If NULL is passed through `new_name` parameter, + * the section will be removed from the config file. + */ +int git_config_rename_section(const char *, const char *); + +int git_config_rename_section_in_file(const char *, const char *, const char *); +int git_config_copy_section(const char *, const char *); +int git_config_copy_section_in_file(const char *, const char *, const char *); +int git_env_bool(const char *, int); +unsigned long git_env_ulong(const char *, unsigned long); +int git_config_system(void); +int config_error_nonbool(const char *); +#if defined(__GNUC__) +#define config_error_nonbool(s) (config_error_nonbool(s), const_error()) +#endif + +char *git_system_config(void); +void git_global_config(char **user, char **xdg); + +int git_config_parse_parameter(const char *, config_fn_t fn, void *data); + +enum config_scope current_config_scope(void); +const char *current_config_origin_type(void); +const char *current_config_name(void); +int current_config_line(void); + +/* + * Match and parse a config key of the form: + * + * section.(subsection.)?key + * + * (i.e., what gets handed to a config_fn_t). The caller provides the section; + * we return -1 if it does not match, 0 otherwise. The subsection and key + * out-parameters are filled by the function (and *subsection is NULL if it is + * missing). + * + * If the subsection pointer-to-pointer passed in is NULL, returns 0 only if + * there is no subsection at all. + */ +int parse_config_key(const char *var, + const char *section, + const char **subsection, size_t *subsection_len, + const char **key); + +/** + * Custom Configsets + * ----------------- + * + * A `config_set` can be used to construct an in-memory cache for + * config-like files that the caller specifies (i.e., files like `.gitmodules`, + * `~/.gitconfig` etc.). For example, + * + * ---------------------------------------- + * struct config_set gm_config; + * git_configset_init(&gm_config); + * int b; + * //we add config files to the config_set + * git_configset_add_file(&gm_config, ".gitmodules"); + * git_configset_add_file(&gm_config, ".gitmodules_alt"); + * + * if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) { + * //hack hack hack + * } + * + * when we are done with the configset: + * git_configset_clear(&gm_config); + * ---------------------------------------- + * + * Configset API provides functions for the above mentioned work flow + */ + +struct config_set_element { + struct hashmap_entry ent; + char *key; + struct string_list value_list; +}; + +struct configset_list_item { + struct config_set_element *e; + int value_index; +}; + +/* + * the contents of the list are ordered according to their + * position in the config files and order of parsing the files. + * (i.e. key-value pair at the last position of .git/config will + * be at the last item of the list) + */ +struct configset_list { + struct configset_list_item *items; + unsigned int nr, alloc; +}; + +struct config_set { + struct hashmap config_hash; + int hash_initialized; + struct configset_list list; +}; + +/** + * Initializes the config_set `cs`. + */ +void git_configset_init(struct config_set *cs); + +/** + * Parses the file and adds the variable-value pairs to the `config_set`, + * dies if there is an error in parsing the file. Returns 0 on success, or + * -1 if the file does not exist or is inaccessible. The caller decides + * whether to free the incomplete configset or continue using it when + * the function returns -1. + */ +int git_configset_add_file(struct config_set *cs, const char *filename); + +/** + * Parses command line options and environment variables, and adds the + * variable-value pairs to the `config_set`. Returns 0 on success, or -1 + * if there is an error in parsing. The caller decides whether to free + * the incomplete configset or continue using it when the function + * returns -1. + */ +int git_configset_add_parameters(struct config_set *cs); + +/** + * Finds and returns the value list, sorted in order of increasing priority + * for the configuration variable `key` and config set `cs`. When the + * configuration variable `key` is not found, returns NULL. The caller + * should not free or modify the returned pointer, as it is owned by the cache. + */ +const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key); + +/** + * Clears `config_set` structure, removes all saved variable-value pairs. + */ +void git_configset_clear(struct config_set *cs); + +/* + * These functions return 1 if not found, and 0 if found, leaving the found + * value in the 'dest' pointer. + */ + +/* + * Finds the highest-priority value for the configuration variable `key` + * and config set `cs`, stores the pointer to it in `value` and returns 0. + * When the configuration variable `key` is not found, returns 1 without + * touching `value`. The caller should not free or modify `value`, as it + * is owned by the cache. + */ +int git_configset_get_value(struct config_set *cs, const char *key, const char **dest); + +int git_configset_get_string(struct config_set *cs, const char *key, char **dest); +int git_configset_get_int(struct config_set *cs, const char *key, int *dest); +int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest); +int git_configset_get_bool(struct config_set *cs, const char *key, int *dest); +int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest); +int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest); +int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest); + +/* Functions for reading a repository's config */ +struct repository; +void repo_config(struct repository *repo, config_fn_t fn, void *data); +int repo_config_get_value(struct repository *repo, + const char *key, const char **value); +const struct string_list *repo_config_get_value_multi(struct repository *repo, + const char *key); +int repo_config_get_string(struct repository *repo, + const char *key, char **dest); +int repo_config_get_string_tmp(struct repository *repo, + const char *key, const char **dest); +int repo_config_get_int(struct repository *repo, + const char *key, int *dest); +int repo_config_get_ulong(struct repository *repo, + const char *key, unsigned long *dest); +int repo_config_get_bool(struct repository *repo, + const char *key, int *dest); +int repo_config_get_bool_or_int(struct repository *repo, + const char *key, int *is_bool, int *dest); +int repo_config_get_maybe_bool(struct repository *repo, + const char *key, int *dest); +int repo_config_get_pathname(struct repository *repo, + const char *key, const char **dest); + +/* + * Functions for reading protected config. By definition, protected + * config ignores repository config, so these do not take a `struct + * repository` parameter. + */ +void git_protected_config(config_fn_t fn, void *data); + +/** + * Querying For Specific Variables + * ------------------------------- + * + * For programs wanting to query for specific variables in a non-callback + * manner, the config API provides two functions `git_config_get_value` + * and `git_config_get_value_multi`. They both read values from an internal + * cache generated previously from reading the config files. + */ + +/** + * Finds the highest-priority value for the configuration variable `key`, + * stores the pointer to it in `value` and returns 0. When the + * configuration variable `key` is not found, returns 1 without touching + * `value`. The caller should not free or modify `value`, as it is owned + * by the cache. + */ +int git_config_get_value(const char *key, const char **value); + +/** + * Finds and returns the value list, sorted in order of increasing priority + * for the configuration variable `key`. When the configuration variable + * `key` is not found, returns NULL. The caller should not free or modify + * the returned pointer, as it is owned by the cache. + */ +const struct string_list *git_config_get_value_multi(const char *key); + +/** + * Resets and invalidates the config cache. + */ +void git_config_clear(void); + +/** + * Allocates and copies the retrieved string into the `dest` parameter for + * the configuration variable `key`; if NULL string is given, prints an + * error message and returns -1. When the configuration variable `key` is + * not found, returns 1 without touching `dest`. + */ +int git_config_get_string(const char *key, char **dest); + +/** + * Similar to `git_config_get_string`, but does not allocate any new + * memory; on success `dest` will point to memory owned by the config + * machinery, which could be invalidated if it is discarded and reloaded. + */ +int git_config_get_string_tmp(const char *key, const char **dest); + +/** + * Finds and parses the value to an integer for the configuration variable + * `key`. Dies on error; otherwise, stores the value of the parsed integer in + * `dest` and returns 0. When the configuration variable `key` is not found, + * returns 1 without touching `dest`. + */ +int git_config_get_int(const char *key, int *dest); + +/** + * Similar to `git_config_get_int` but for unsigned longs. + */ +int git_config_get_ulong(const char *key, unsigned long *dest); + +/** + * Finds and parses the value into a boolean value, for the configuration + * variable `key` respecting keywords like "true" and "false". Integer + * values are converted into true/false values (when they are non-zero or + * zero, respectively). Other values cause a die(). If parsing is successful, + * stores the value of the parsed result in `dest` and returns 0. When the + * configuration variable `key` is not found, returns 1 without touching + * `dest`. + */ +int git_config_get_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_bool`, except that integers are copied as-is, + * and `is_bool` flag is unset. + */ +int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest); + +/** + * Similar to `git_config_get_bool`, except that it returns -1 on error + * rather than dying. + */ +int git_config_get_maybe_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_string`, but expands `~` or `~user` into + * the user's home directory when found at the beginning of the path. + */ +int git_config_get_pathname(const char *key, const char **dest); + +int git_config_get_index_threads(int *dest); +int git_config_get_split_index(void); +int git_config_get_max_percent_split_change(void); + +/* This dies if the configured or default date is in the future */ +int git_config_get_expiry(const char *key, const char **output); + +/* parse either "this many days" integer, or "5.days.ago" approxidate */ +int git_config_get_expiry_in_days(const char *key, timestamp_t *, timestamp_t now); + +struct key_value_info { + const char *filename; + int linenr; + enum config_origin_type origin_type; + enum config_scope scope; +}; + +/** + * First prints the error message specified by the caller in `err` and then + * dies printing the line number and the file name of the highest priority + * value for the configuration variable `key`. + */ +NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3))); + +/** + * Helper function which formats the die error message according to the + * parameters entered. Used by `git_die_config()`. It can be used by callers + * handling `git_config_get_value_multi()` to print the correct error message + * for the desired value. + */ +NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr); + +#define LOOKUP_CONFIG(mapping, var) \ + lookup_config(mapping, ARRAY_SIZE(mapping), var) +int lookup_config(const char **mapping, int nr_mapping, const char *var); + +#endif /* CONFIG_H */ |