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-rw-r--r--apt-pkg/aptconfiguration.cc545
1 files changed, 545 insertions, 0 deletions
diff --git a/apt-pkg/aptconfiguration.cc b/apt-pkg/aptconfiguration.cc
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+++ b/apt-pkg/aptconfiguration.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Provide access methods to various configuration settings,
+ setup defaults and returns validate settings.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/aptconfiguration.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/macros.h>
+#include <apt-pkg/pkgsystem.h>
+#include <apt-pkg/strutl.h>
+
+#include <algorithm>
+#include <string>
+#include <vector>
+#include <ctype.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+ /*}}}*/
+namespace APT {
+// setDefaultConfigurationForCompressors /*{{{*/
+static void setDefaultConfigurationForCompressors() {
+ // Set default application paths to check for optional compression types
+ _config->CndSet("Dir::Bin::gzip", "/bin/gzip");
+ _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
+ _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
+ _config->CndSet("Dir::Bin::lz4", "/usr/bin/lz4");
+ _config->CndSet("Dir::Bin::zstd", "/usr/bin/zstd");
+ if (FileExists(_config->Find("Dir::Bin::xz")) == true) {
+ _config->Set("Dir::Bin::lzma", _config->Find("Dir::Bin::xz"));
+ _config->Set("APT::Compressor::lzma::Binary", "xz");
+ if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
+ _config->Set("APT::Compressor::lzma::CompressArg::", "--format=lzma");
+ _config->Set("APT::Compressor::lzma::CompressArg::", "-6");
+ }
+ if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
+ _config->Set("APT::Compressor::lzma::UncompressArg::", "--format=lzma");
+ _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
+ }
+ } else {
+ _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
+ if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
+ _config->Set("APT::Compressor::lzma::CompressArg::", "--suffix=");
+ _config->Set("APT::Compressor::lzma::CompressArg::", "-6");
+ }
+ if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
+ _config->Set("APT::Compressor::lzma::UncompressArg::", "--suffix=");
+ _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
+ }
+ }
+ // setup the defaults for the compressiontypes => method mapping
+ _config->CndSet("Acquire::CompressionTypes::xz","xz");
+ _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
+ _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
+ _config->CndSet("Acquire::CompressionTypes::gz","gzip");
+ _config->CndSet("Acquire::CompressionTypes::lz4","lz4");
+ _config->CndSet("Acquire::CompressionTypes::zst", "zstd");
+}
+ /*}}}*/
+// getCompressionTypes - Return Vector of usable compressiontypes /*{{{*/
+// ---------------------------------------------------------------------
+/* return a vector of compression types in the preferred order. */
+std::vector<std::string>
+const Configuration::getCompressionTypes(bool const &Cached) {
+ static std::vector<std::string> types;
+ if (types.empty() == false) {
+ if (Cached == true)
+ return types;
+ else
+ types.clear();
+ }
+
+ std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
+
+ // load the order setting into our vector
+ std::vector<std::string> const order = _config->FindVector("Acquire::CompressionTypes::Order");
+ for (std::vector<std::string>::const_iterator o = order.begin();
+ o != order.end(); ++o) {
+ if ((*o).empty() == true)
+ continue;
+ // ignore types we have no method ready to use
+ std::string const method = std::string("Acquire::CompressionTypes::").append(*o);
+ if (_config->Exists(method) == false)
+ continue;
+ // ignore types we have no app ready to use
+ std::string const app = _config->Find(method);
+ if (std::find_if(compressors.begin(), compressors.end(), [&app](APT::Configuration::Compressor const &c) {
+ return c.Name == app;
+ }) == compressors.end())
+ continue;
+ types.push_back(*o);
+ }
+
+ // move again over the option tree to add all missing compression types
+ ::Configuration::Item const *Types = _config->Tree("Acquire::CompressionTypes");
+ if (Types != 0)
+ Types = Types->Child;
+
+ for (; Types != 0; Types = Types->Next) {
+ if (Types->Tag == "Order" || Types->Tag.empty() == true)
+ continue;
+ // ignore types we already have in the vector
+ if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
+ continue;
+ // ignore types we have no app ready to use
+ if (std::find_if(compressors.begin(), compressors.end(), [&Types](APT::Configuration::Compressor const &c) {
+ return c.Name == Types->Value;
+ }) == compressors.end())
+ continue;
+ types.push_back(Types->Tag);
+ }
+
+ // add the special "uncompressed" type
+ if (std::find(types.begin(), types.end(), "uncompressed") == types.end())
+ {
+ std::string const uncompr = _config->Find("Dir::Bin::uncompressed", "");
+ if (uncompr.empty() == true || FileExists(uncompr) == true)
+ types.push_back("uncompressed");
+ }
+
+ return types;
+}
+ /*}}}*/
+// GetLanguages - Return Vector of Language Codes /*{{{*/
+// ---------------------------------------------------------------------
+/* return a vector of language codes in the preferred order.
+ the special word "environment" will be replaced with the long and the short
+ code of the local settings and it will be insured that this will not add
+ duplicates. So in an german local the setting "environment, de_DE, en, de"
+ will result in "de_DE, de, en".
+ The special word "none" is the stopcode for the not-All code vector */
+std::vector<std::string> const Configuration::getLanguages(bool const &All,
+ bool const &Cached, char const ** const Locale) {
+ using std::string;
+
+ // The detection is boring and has a lot of cornercases,
+ // so we cache the results to calculated it only once.
+ std::vector<string> static allCodes;
+ std::vector<string> static codes;
+
+ // we have something in the cache
+ if (codes.empty() == false || allCodes.empty() == false) {
+ if (Cached == true) {
+ if(All == true && allCodes.empty() == false)
+ return allCodes;
+ else
+ return codes;
+ } else {
+ allCodes.clear();
+ codes.clear();
+ }
+ }
+
+ // Include all Language codes we have a Translation file for in /var/lib/apt/lists
+ // so they will be all included in the Cache.
+ std::vector<string> builtin;
+ DIR *D = opendir(_config->FindDir("Dir::State::lists").c_str());
+ if (D != NULL) {
+ builtin.push_back("none");
+ for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
+ string const name = SubstVar(Ent->d_name, "%5f", "_");
+ size_t const foundDash = name.rfind("-");
+ size_t const foundUnderscore = name.rfind("_", foundDash);
+ if (foundDash == string::npos || foundUnderscore == string::npos ||
+ foundDash <= foundUnderscore ||
+ name.substr(foundUnderscore+1, foundDash-(foundUnderscore+1)) != "Translation")
+ continue;
+ string const c = name.substr(foundDash+1);
+ if (unlikely(c.empty() == true) || c == "en")
+ continue;
+ // Skip unusual files, like backups or that alike
+ string::const_iterator s = c.begin();
+ for (;s != c.end(); ++s) {
+ if (isalpha(*s) == 0 && *s != '_')
+ break;
+ }
+ if (s != c.end())
+ continue;
+ if (std::find(builtin.begin(), builtin.end(), c) != builtin.end())
+ continue;
+ builtin.push_back(c);
+ }
+ closedir(D);
+ }
+
+ // FIXME: Remove support for the old APT::Acquire::Translation
+ // it was undocumented and so it should be not very widthly used
+ string const oldAcquire = _config->Find("APT::Acquire::Translation","");
+ if (oldAcquire.empty() == false && oldAcquire != "environment") {
+ // TRANSLATORS: the two %s are APT configuration options
+ _error->Notice("Option '%s' is deprecated. Please use '%s' instead, see 'man 5 apt.conf' for details.",
+ "APT::Acquire::Translation", "Acquire::Languages");
+ if (oldAcquire != "none")
+ codes.push_back(oldAcquire);
+ codes.push_back("en");
+ allCodes = codes;
+ for (std::vector<string>::const_iterator b = builtin.begin();
+ b != builtin.end(); ++b)
+ if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
+ allCodes.push_back(*b);
+ if (All == true)
+ return allCodes;
+ else
+ return codes;
+ }
+
+ // get the environment language codes: LC_MESSAGES (and later LANGUAGE)
+ // we extract both, a long and a short code and then we will
+ // check if we actually need both (rare) or if the short is enough
+ string const envMsg = string(Locale == 0 ? ::setlocale(LC_MESSAGES, NULL) : *Locale);
+ size_t const lenShort = (envMsg.find('_') != string::npos) ? envMsg.find('_') : 2;
+ size_t const lenLong = (envMsg.find_first_of(".@") != string::npos) ? envMsg.find_first_of(".@") : (lenShort + 3);
+
+ string const envLong = envMsg.substr(0,lenLong);
+ string const envShort = envLong.substr(0,lenShort);
+
+ // It is very likely we will need the environment codes later,
+ // so let us generate them now from LC_MESSAGES and LANGUAGE
+ std::vector<string> environment;
+ if (envShort != "C") {
+ // take care of LC_MESSAGES
+ if (envLong != envShort)
+ environment.push_back(envLong);
+ environment.push_back(envShort);
+ // take care of LANGUAGE
+ const char *language_env = getenv("LANGUAGE") == 0 ? "" : getenv("LANGUAGE");
+ string envLang = Locale == 0 ? language_env : *(Locale+1);
+ if (envLang.empty() == false) {
+ std::vector<string> env = VectorizeString(envLang,':');
+ short addedLangs = 0; // add a maximum of 3 fallbacks from the environment
+ for (std::vector<string>::const_iterator e = env.begin();
+ e != env.end() && addedLangs < 3; ++e) {
+ if (unlikely(e->empty() == true) || *e == "en")
+ continue;
+ if (*e == envLong || *e == envShort)
+ continue;
+ if (std::find(environment.begin(), environment.end(), *e) != environment.end())
+ continue;
+ ++addedLangs;
+ environment.push_back(*e);
+ }
+ }
+ } else {
+ // cornercase: LANG=C, so we use only "en" Translation
+ environment.push_back("en");
+ }
+
+ std::vector<string> const lang = _config->FindVector("Acquire::Languages", "environment,en");
+ // the configs define the order, so add the environment
+ // then needed and ensure the codes are not listed twice.
+ bool noneSeen = false;
+ for (std::vector<string>::const_iterator l = lang.begin();
+ l != lang.end(); ++l) {
+ if (*l == "environment") {
+ for (std::vector<string>::const_iterator e = environment.begin();
+ e != environment.end(); ++e) {
+ if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
+ continue;
+ if (noneSeen == false)
+ codes.push_back(*e);
+ allCodes.push_back(*e);
+ }
+ continue;
+ } else if (*l == "none") {
+ noneSeen = true;
+ continue;
+ } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
+ continue;
+
+ if (noneSeen == false)
+ codes.push_back(*l);
+ allCodes.push_back(*l);
+ }
+
+ if (allCodes.empty() == false) {
+ for (std::vector<string>::const_iterator b = builtin.begin();
+ b != builtin.end(); ++b)
+ if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
+ allCodes.push_back(*b);
+ } else {
+ // "none" was forced
+ allCodes.push_back("none");
+ }
+
+ if (All == true)
+ return allCodes;
+ else
+ return codes;
+}
+ /*}}}*/
+// checkLanguage - are we interested in the given Language? /*{{{*/
+bool Configuration::checkLanguage(std::string Lang, bool const All) {
+ // the empty Language is always interesting as it is the original
+ if (Lang.empty() == true)
+ return true;
+ // filenames are encoded, so undo this
+ Lang = SubstVar(Lang, "%5f", "_");
+ std::vector<std::string> const langs = getLanguages(All, true);
+ return (std::find(langs.begin(), langs.end(), Lang) != langs.end());
+}
+ /*}}}*/
+// getArchitectures - Return Vector of preferred Architectures /*{{{*/
+std::vector<std::string> const Configuration::getArchitectures(bool const &Cached) {
+ using std::string;
+
+ std::vector<string> static archs;
+ if (likely(Cached == true) && archs.empty() == false)
+ return archs;
+
+ string const arch = _config->Find("APT::Architecture");
+ archs = _config->FindVector("APT::Architectures");
+
+ if (archs.empty() == true && _system != nullptr)
+ archs = _system->ArchitecturesSupported();
+
+ if (archs.empty() == true ||
+ std::find(archs.begin(), archs.end(), arch) == archs.end())
+ archs.insert(archs.begin(), arch);
+
+ // erase duplicates and empty strings
+ for (std::vector<string>::reverse_iterator a = archs.rbegin();
+ a != archs.rend(); ++a) {
+ if (a->empty() == true || std::find(a + 1, archs.rend(), *a) != archs.rend())
+ archs.erase(a.base()-1);
+ if (a == archs.rend())
+ break;
+ }
+
+ return archs;
+}
+ /*}}}*/
+// checkArchitecture - are we interested in the given Architecture? /*{{{*/
+bool Configuration::checkArchitecture(std::string const &Arch) {
+ if (Arch == "all")
+ return true;
+ std::vector<std::string> const archs = getArchitectures(true);
+ return (std::find(archs.begin(), archs.end(), Arch) != archs.end());
+}
+ /*}}}*/
+// getCompressors - Return Vector of usealbe compressors /*{{{*/
+// ---------------------------------------------------------------------
+/* return a vector of compressors used by apt-ftparchive in the
+ multicompress functionality or to detect data.tar files */
+std::vector<APT::Configuration::Compressor>
+const Configuration::getCompressors(bool const Cached) {
+ static std::vector<APT::Configuration::Compressor> compressors;
+ if (compressors.empty() == false) {
+ if (Cached == true)
+ return compressors;
+ else
+ compressors.clear();
+ }
+
+ setDefaultConfigurationForCompressors();
+
+ std::vector<std::string> CompressorsDone;
+# define APT_ADD_COMPRESSOR(NAME, EXT, BINARY, ARG, DEARG, COST) \
+ { CompressorsDone.push_back(NAME); compressors.emplace_back(NAME, EXT, BINARY, ARG, DEARG, COST); }
+ APT_ADD_COMPRESSOR(".", "", "", nullptr, nullptr, 0)
+ if (_config->Exists("Dir::Bin::zstd") == false || FileExists(_config->Find("Dir::Bin::zstd")) == true)
+ APT_ADD_COMPRESSOR("zstd", ".zst", "zstd", "-19", "-d", 60)
+#ifdef HAVE_ZSTD
+ else
+ APT_ADD_COMPRESSOR("zstd", ".zst", "false", nullptr, nullptr, 60)
+#endif
+ if (_config->Exists("Dir::Bin::lz4") == false || FileExists(_config->Find("Dir::Bin::lz4")) == true)
+ APT_ADD_COMPRESSOR("lz4",".lz4","lz4","-1","-d",50)
+#ifdef HAVE_LZ4
+ else
+ APT_ADD_COMPRESSOR("lz4",".lz4","false", nullptr, nullptr, 50)
+#endif
+ if (_config->Exists("Dir::Bin::gzip") == false || FileExists(_config->Find("Dir::Bin::gzip")) == true)
+ APT_ADD_COMPRESSOR("gzip",".gz","gzip","-6n","-d",100)
+#ifdef HAVE_ZLIB
+ else
+ APT_ADD_COMPRESSOR("gzip",".gz","false", nullptr, nullptr, 100)
+#endif
+ if (_config->Exists("Dir::Bin::xz") == false || FileExists(_config->Find("Dir::Bin::xz")) == true)
+ APT_ADD_COMPRESSOR("xz",".xz","xz","-6","-d",200)
+#ifdef HAVE_LZMA
+ else
+ APT_ADD_COMPRESSOR("xz",".xz","false", nullptr, nullptr, 200)
+#endif
+ if (_config->Exists("Dir::Bin::bzip2") == false || FileExists(_config->Find("Dir::Bin::bzip2")) == true)
+ APT_ADD_COMPRESSOR("bzip2",".bz2","bzip2","-6","-d",300)
+#ifdef HAVE_BZ2
+ else
+ APT_ADD_COMPRESSOR("bzip2",".bz2","false", nullptr, nullptr, 300)
+#endif
+ if (_config->Exists("Dir::Bin::lzma") == false || FileExists(_config->Find("Dir::Bin::lzma")) == true)
+ APT_ADD_COMPRESSOR("lzma",".lzma","lzma","-6","-d",400)
+#ifdef HAVE_LZMA
+ else
+ APT_ADD_COMPRESSOR("lzma",".lzma","false", nullptr, nullptr, 400)
+#endif
+
+ std::vector<std::string> const comp = _config->FindVector("APT::Compressor", "", true);
+ for (auto const &c: comp)
+ {
+ if (c.empty() || std::find(CompressorsDone.begin(), CompressorsDone.end(), c) != CompressorsDone.end())
+ continue;
+ compressors.push_back(Compressor(c.c_str(), std::string(".").append(c).c_str(), c.c_str(), nullptr, nullptr, 1000));
+ }
+
+ return compressors;
+}
+ /*}}}*/
+// getCompressorExtensions - supported data.tar extensions /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+std::vector<std::string> const Configuration::getCompressorExtensions() {
+ std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
+ std::vector<std::string> ext;
+ for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
+ c != compressors.end(); ++c)
+ if (c->Extension.empty() == false && c->Extension != ".")
+ ext.push_back(c->Extension);
+ return ext;
+}
+ /*}}}*/
+// Compressor constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+Configuration::Compressor::Compressor(char const *name, char const *extension,
+ char const *binary,
+ char const *compressArg, char const *uncompressArg,
+ unsigned short const cost) {
+ std::string const config = std::string("APT::Compressor::").append(name).append("::");
+ Name = _config->Find(std::string(config).append("Name"), name);
+ Extension = _config->Find(std::string(config).append("Extension"), extension);
+ Binary = _config->Find(std::string(config).append("Binary"), binary);
+ Cost = _config->FindI(std::string(config).append("Cost"), cost);
+ std::string const compConf = std::string(config).append("CompressArg");
+ if (_config->Exists(compConf) == true)
+ CompressArgs = _config->FindVector(compConf);
+ else if (compressArg != NULL)
+ CompressArgs.push_back(compressArg);
+ std::string const uncompConf = std::string(config).append("UncompressArg");
+ if (_config->Exists(uncompConf) == true)
+ UncompressArgs = _config->FindVector(uncompConf);
+ else if (uncompressArg != NULL)
+ UncompressArgs.push_back(uncompressArg);
+}
+ /*}}}*/
+// getBuildProfiles - return a vector of enabled build profiles /*{{{*/
+std::vector<std::string> const Configuration::getBuildProfiles() {
+ // order is: override value (~= commandline), environment variable, list (~= config file)
+ std::string profiles_env = getenv("DEB_BUILD_PROFILES") == 0 ? "" : getenv("DEB_BUILD_PROFILES");
+ if (profiles_env.empty() == false) {
+ profiles_env = SubstVar(profiles_env, " ", ",");
+ std::string const bp = _config->Find("APT::Build-Profiles");
+ _config->Clear("APT::Build-Profiles");
+ if (bp.empty() == false)
+ _config->Set("APT::Build-Profiles", bp);
+ }
+ return _config->FindVector("APT::Build-Profiles", profiles_env);
+}
+std::string const Configuration::getBuildProfilesString() {
+ std::vector<std::string> profiles = getBuildProfiles();
+ if (profiles.empty() == true)
+ return "";
+ std::vector<std::string>::const_iterator p = profiles.begin();
+ std::string list = *p;
+ for (++p; p != profiles.end(); ++p)
+ list.append(",").append(*p);
+ return list;
+}
+ /*}}}*/
+
+// getMachineID - read /etc/machine-id into a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+std::string const Configuration::getMachineID()
+{
+ std::string id = _config->Find("APT::Machine-ID");
+
+ if (id.empty())
+ {
+ std::string file = _config->FindFile("Dir::Etc::machine-id");
+
+ if (file.empty())
+ {
+ file = flCombine(_config->FindDir("Dir::Etc"), "../machine-id");
+ }
+ FileFd fd;
+ _error->PushToStack();
+
+ if (not OpenConfigurationFileFd(file, fd) || not fd.ReadLine(id))
+ {
+ if (_config->FindB("Debug::Phasing", false))
+ {
+ _error->DumpErrors(std::clog);
+ }
+ }
+
+ _error->RevertToStack();
+ }
+
+ return id;
+}
+ /*}}}*/
+// isChroot - whether we are inside a chroot /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool Configuration::isChroot()
+{
+ static struct once
+ {
+ bool res = false;
+ once()
+ {
+ pid_t child = ExecFork();
+ if (child == 0)
+ {
+ auto binary = _config->FindFile("Dir::Bin::ischroot", "/usr/bin/ischroot");
+ const char *const Args[] = {
+ binary.c_str(),
+ "-t",
+ nullptr};
+ execvp(Args[0], const_cast<char **>(Args));
+ _exit(127);
+ }
+
+ res = ExecWait(child, "ischroot", true);
+ }
+ } once;
+
+ return once.res;
+}
+ /*}}}*/
+}
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