diff options
Diffstat (limited to 'apt-pkg/aptconfiguration.cc')
| -rw-r--r-- | apt-pkg/aptconfiguration.cc | 545 |
1 files changed, 545 insertions, 0 deletions
diff --git a/apt-pkg/aptconfiguration.cc b/apt-pkg/aptconfiguration.cc new file mode 100644 index 0000000..671c3d5 --- /dev/null +++ b/apt-pkg/aptconfiguration.cc @@ -0,0 +1,545 @@ +// -*- 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; +} + /*}}}*/ +} |