]> git.saurik.com Git - apt.git/blobdiff - apt-pkg/aptconfiguration.cc
Fix typos in documentation (codespell)
[apt.git] / apt-pkg / aptconfiguration.cc
index f3f94dce3a6dc9760cbeb7709fa97f6c4b5a807c..0b0b546c501d799d8020b693f2a1fb4dec1b326b 100644 (file)
@@ -8,23 +8,28 @@
    ##################################################################### */
                                                                        /*}}}*/
 // 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/strutl.h>
 
 #include <sys/types.h>
 #include <dirent.h>
+#include <stdio.h>
+#include <fcntl.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
                                                                        /*}}}*/
 namespace APT {
-// getCompressionTypes - Return Vector of usbale compressiontypes      /*{{{*/
+// getCompressionTypes - Return Vector of usable compressiontypes      /*{{{*/
 // ---------------------------------------------------------------------
-/* return a vector of compression types in the prefered order. */
+/* 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;
@@ -37,12 +42,12 @@ const Configuration::getCompressionTypes(bool const &Cached) {
 
        // setup the defaults for the compressiontypes => method mapping
        _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
+       _config->CndSet("Acquire::CompressionTypes::xz","xz");
        _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
        _config->CndSet("Acquire::CompressionTypes::gz","gzip");
 
-       // Set default application paths to check for optional compression types
-       _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
-       _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
+       setDefaultConfigurationForCompressors();
+       std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
 
        // accept non-list order as override setting for config settings on commandline
        std::string const overrideOrder = _config->Find("Acquire::CompressionTypes::Order","");
@@ -52,19 +57,21 @@ const Configuration::getCompressionTypes(bool const &Cached) {
        // 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++) {
+            o != order.end(); ++o) {
                if ((*o).empty() == true)
                        continue;
                // ignore types we have no method ready to use
-               if (_config->Exists(string("Acquire::CompressionTypes::").append(*o)) == false)
+               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
-               string const appsetting = string("Dir::Bin::").append(*o);
-               if (_config->Exists(appsetting) == true) {
-                       std::string const app = _config->FindFile(appsetting.c_str(), "");
-                       if (app.empty() == false && FileExists(app) == false)
-                               continue;
-               }
+               std::string const app = _config->Find(method);
+               std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
+               for (; c != compressors.end(); ++c)
+                       if (c->Name == app)
+                               break;
+               if (c == compressors.end())
+                       continue;
                types.push_back(*o);
        }
 
@@ -80,21 +87,29 @@ const Configuration::getCompressionTypes(bool const &Cached) {
                if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
                        continue;
                // ignore types we have no app ready to use
-               string const appsetting = string("Dir::Bin::").append(Types->Value);
-               if (appsetting.empty() == false && _config->Exists(appsetting) == true) {
-                       std::string const app = _config->FindFile(appsetting.c_str(), "");
-                       if (app.empty() == false && FileExists(app) == false)
-                               continue;
-               }
+               std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
+               for (; c != compressors.end(); ++c)
+                       if (c->Name == Types->Value)
+                               break;
+               if (c == 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->FindFile("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 prefered order.
+/* 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"
@@ -126,12 +141,12 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
        // 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 != 0) {
+       if (D != NULL) {
                builtin.push_back("none");
                for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
-                       string const name = Ent->d_name;
+                       string const name = SubstVar(Ent->d_name, "%5f", "_");
                        size_t const foundDash = name.rfind("-");
-                       size_t const foundUnderscore = 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")
@@ -142,7 +157,7 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
                        // Skip unusual files, like backups or that alike
                        string::const_iterator s = c.begin();
                        for (;s != c.end(); ++s) {
-                               if (isalpha(*s) == 0)
+                               if (isalpha(*s) == 0 && *s != '_')
                                        break;
                        }
                        if (s != c.end())
@@ -151,51 +166,16 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
                                continue;
                        builtin.push_back(c);
                }
+               closedir(D);
        }
-       closedir(D);
-
-       // 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 ? std::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 envLong = envMsg.substr(0,lenLong);
-       string const envShort = envLong.substr(0,lenShort);
-       bool envLongIncluded = true;
-
-       // first cornercase: LANG=C, so we use only "en" Translation
-       if (envLong == "C") {
-               codes.push_back("en");
-               allCodes = codes;
-               allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
-               if (All == true)
-                       return allCodes;
-               else
-                       return codes;
-       }
-
-       // to save the servers from unneeded queries, we only try also long codes
-       // for languages it is realistic to have a long code translation file…
-       // TODO: Improve translation acquire system to drop them dynamic
-       char const *needLong[] = { "cs", "en", "pt", "sv", "zh", NULL };
-       if (envLong != envShort) {
-               for (char const **l = needLong; *l != NULL; l++)
-                       if (envShort.compare(*l) == 0) {
-                               envLongIncluded = false;
-                               break;
-                       }
-       }
-
-       // we don't add the long code, but we allow the user to do so
-       if (envLongIncluded == true)
-               envLong.clear();
 
        // 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");
@@ -210,55 +190,75 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
                        return codes;
        }
 
-       // It is very likely we will need to environment codes later,
+       // 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 ? std::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;
-       // take care of LC_MESSAGES
-       if (envLongIncluded == false)
-               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 = ExplodeString(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;
-                       if (e->find('_') != string::npos) {
-                               // Drop LongCodes here - ShortCodes are also included
-                               string const shorty = e->substr(0, e->find('_'));
-                               char const **n = needLong;
-                               for (; *n != NULL; ++n)
-                                       if (shorty == *n)
-                                               break;
-                               if (*n == NULL)
+       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);
                        }
-                       ++addedLangs;
-                       environment.push_back(*e);
                }
+       } else {
+               environment.push_back("en");
        }
 
-       // Support settings like Acquire::Translation=none on the command line to
+       // Support settings like Acquire::Languages=none on the command line to
        // override the configuration settings vector of languages.
        string const forceLang = _config->Find("Acquire::Languages","");
        if (forceLang.empty() == false) {
-               if (forceLang == "environment") {
-                       codes = environment;
-               } else if (forceLang != "none")
-                       codes.push_back(forceLang);
-               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 (forceLang == "none") {
+                       codes.clear();
+                       allCodes.clear();
+                       allCodes.push_back("none");
+               } else {
+                       if (forceLang == "environment")
+                               codes = environment;
+                       else
+                               codes.push_back(forceLang);
+                       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;
+       }
+
+       // cornercase: LANG=C, so we use only "en" Translation
+       if (envShort == "C") {
+               allCodes = codes = environment;
+               allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
                if (All == true)
                        return allCodes;
                else
@@ -286,7 +286,7 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
        // 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++) {
+            l != lang.end(); ++l) {
                if (*l == "environment") {
                        for (std::vector<string>::const_iterator e = environment.begin();
                             e != environment.end(); ++e) {
@@ -319,4 +319,243 @@ std::vector<std::string> const Configuration::getLanguages(bool const &All,
                return codes;
 }
                                                                        /*}}}*/
+// checkLanguage - are we interested in the given Language?            /*{{{*/
+bool const 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 (unlikely(arch.empty() == true))
+               return archs;
+
+       // FIXME: It is a bit unclean to have debian specific code here…
+       if (archs.empty() == true) {
+               archs.push_back(arch);
+
+               // Generate the base argument list for dpkg
+               std::vector<const char *> Args;
+               string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
+               {
+                       string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
+                       size_t dpkgChrootLen = dpkgChrootDir.length();
+                       if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0) {
+                               if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
+                                       --dpkgChrootLen;
+                               Tmp = Tmp.substr(dpkgChrootLen);
+                       }
+               }
+               Args.push_back(Tmp.c_str());
+
+               // Stick in any custom dpkg options
+               ::Configuration::Item const *Opts = _config->Tree("DPkg::Options");
+               if (Opts != 0) {
+                       Opts = Opts->Child;
+                       for (; Opts != 0; Opts = Opts->Next)
+                       {
+                               if (Opts->Value.empty() == true)
+                                       continue;
+                               Args.push_back(Opts->Value.c_str());
+                       }
+               }
+
+               Args.push_back("--print-foreign-architectures");
+               Args.push_back(NULL);
+
+               int external[2] = {-1, -1};
+               if (pipe(external) != 0)
+               {
+                       _error->WarningE("getArchitecture", "Can't create IPC pipe for dpkg --print-foreign-architectures");
+                       return archs;
+               }
+
+               pid_t dpkgMultiArch = ExecFork();
+               if (dpkgMultiArch == 0) {
+                       close(external[0]);
+                       std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
+                       int const nullfd = open("/dev/null", O_RDONLY);
+                       dup2(nullfd, STDIN_FILENO);
+                       dup2(external[1], STDOUT_FILENO);
+                       dup2(nullfd, STDERR_FILENO);
+                       if (chrootDir != "/" && chroot(chrootDir.c_str()) != 0 && chdir("/") != 0)
+                               _error->WarningE("getArchitecture", "Couldn't chroot into %s for dpkg --print-foreign-architectures", chrootDir.c_str());
+                       execvp(Args[0], (char**) &Args[0]);
+                       _error->WarningE("getArchitecture", "Can't detect foreign architectures supported by dpkg!");
+                       _exit(100);
+               }
+               close(external[1]);
+
+               FILE *dpkg = fdopen(external[0], "r");
+               if(dpkg != NULL) {
+                       char buf[1024];
+                       while (fgets(buf, sizeof(buf), dpkg) != NULL) {
+                               char* arch = strtok(buf, " ");
+                               while (arch != NULL) {
+                                       for (; isspace(*arch) != 0; ++arch);
+                                       if (arch[0] != '\0') {
+                                               char const* archend = arch;
+                                               for (; isspace(*archend) == 0 && *archend != '\0'; ++archend);
+                                               string a(arch, (archend - arch));
+                                               if (std::find(archs.begin(), archs.end(), a) == archs.end())
+                                                       archs.push_back(a);
+                                       }
+                                       arch = strtok(NULL, " ");
+                               }
+                       }
+                       fclose(dpkg);
+               }
+               ExecWait(dpkgMultiArch, "dpkg --print-foreign-architectures", true);
+               return archs;
+       }
+
+       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 const 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());
+}
+                                                                       /*}}}*/
+// setDefaultConfigurationForCompressors                               /*{{{*/
+void Configuration::setDefaultConfigurationForCompressors() {
+       // Set default application paths to check for optional compression types
+       _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
+       _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
+       if (FileExists(_config->FindFile("Dir::Bin::xz")) == true) {
+               _config->Set("Dir::Bin::lzma", _config->FindFile("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::", "-9");
+               }
+               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::", "-9");
+               }
+               if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
+                       _config->Set("APT::Compressor::lzma::UncompressArg::", "--suffix=");
+                       _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
+               }
+       }
+}
+                                                                       /*}}}*/
+// getCompressors - Return Vector of usbale 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();
+
+       compressors.push_back(Compressor(".", "", "", NULL, NULL, 1));
+       if (_config->Exists("Dir::Bin::gzip") == false || FileExists(_config->FindFile("Dir::Bin::gzip")) == true)
+               compressors.push_back(Compressor("gzip",".gz","gzip","-9n","-d",2));
+#ifdef HAVE_ZLIB
+       else
+               compressors.push_back(Compressor("gzip",".gz","false", NULL, NULL, 2));
+#endif
+       if (_config->Exists("Dir::Bin::bzip2") == false || FileExists(_config->FindFile("Dir::Bin::bzip2")) == true)
+               compressors.push_back(Compressor("bzip2",".bz2","bzip2","-9","-d",3));
+#ifdef HAVE_BZ2
+       else
+               compressors.push_back(Compressor("bzip2",".bz2","false", NULL, NULL, 3));
+#endif
+       if (_config->Exists("Dir::Bin::xz") == false || FileExists(_config->FindFile("Dir::Bin::xz")) == true)
+               compressors.push_back(Compressor("xz",".xz","xz","-6","-d",4));
+       if (_config->Exists("Dir::Bin::lzma") == false || FileExists(_config->FindFile("Dir::Bin::lzma")) == true)
+               compressors.push_back(Compressor("lzma",".lzma","lzma","-9","-d",5));
+
+       std::vector<std::string> const comp = _config->FindVector("APT::Compressor");
+       for (std::vector<std::string>::const_iterator c = comp.begin();
+            c != comp.end(); ++c) {
+               if (*c == "." || *c == "gzip" || *c == "bzip2" || *c == "lzma" || *c == "xz")
+                       continue;
+               compressors.push_back(Compressor(c->c_str(), std::string(".").append(*c).c_str(), c->c_str(), "-9", "-d", 100));
+       }
+
+       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);
+}
+                                                                       /*}}}*/
 }