apt-pkg/aptconfiguration.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Provide access methods to various configuration settings,
   6    setup defaults and returns validate settings.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <apt-pkg/aptconfiguration.h>
  12 #include <apt-pkg/configuration.h>
  13 #include <apt-pkg/fileutl.h>
  14 #include <apt-pkg/macros.h>
  15 #include <apt-pkg/strutl.h>
  16
  17 #include <sys/types.h>
  18 #include <dirent.h>
  19
  20 #include <algorithm>
  21 #include <string>
  22 #include <vector>
  23                                                                         /*}}}*/
  24 namespace APT {
  25 // getCompressionTypes - Return Vector of usbale compressiontypes       /*{{{*/
  26 // ---------------------------------------------------------------------
  27 /* return a vector of compression types in the prefered order. */
  28 std::vector<std::string>
  29 const Configuration::getCompressionTypes(bool const &Cached) {
  30         static std::vector<std::string> types;
  31         if (types.empty() == false) {
  32                 if (Cached == true)
  33                         return types;
  34                 else
  35                         types.clear();
  36         }
  37
  38         // setup the defaults for the compressiontypes => method mapping
  39         _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
  40         _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
  41         _config->CndSet("Acquire::CompressionTypes::gz","gzip");
  42
  43         // Set default application paths to check for optional compression types
  44         _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
  45         _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
  46
  47         // accept non-list order as override setting for config settings on commandline
  48         std::string const overrideOrder = _config->Find("Acquire::CompressionTypes::Order","");
  49         if (overrideOrder.empty() == false)
  50                 types.push_back(overrideOrder);
  51
  52         // load the order setting into our vector
  53         std::vector<std::string> const order = _config->FindVector("Acquire::CompressionTypes::Order");
  54         for (std::vector<std::string>::const_iterator o = order.begin();
  55              o != order.end(); o++) {
  56                 if ((*o).empty() == true)
  57                         continue;
  58                 // ignore types we have no method ready to use
  59                 if (_config->Exists(string("Acquire::CompressionTypes::").append(*o)) == false)
  60                         continue;
  61                 // ignore types we have no app ready to use
  62                 string const appsetting = string("Dir::Bin::").append(*o);
  63                 if (_config->Exists(appsetting) == true) {
  64                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  65                         if (app.empty() == false && FileExists(app) == false)
  66                                 continue;
  67                 }
  68                 types.push_back(*o);
  69         }
  70
  71         // move again over the option tree to add all missing compression types
  72         ::Configuration::Item const *Types = _config->Tree("Acquire::CompressionTypes");
  73         if (Types != 0)
  74                 Types = Types->Child;
  75
  76         for (; Types != 0; Types = Types->Next) {
  77                 if (Types->Tag == "Order" || Types->Tag.empty() == true)
  78                         continue;
  79                 // ignore types we already have in the vector
  80                 if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
  81                         continue;
  82                 // ignore types we have no app ready to use
  83                 string const appsetting = string("Dir::Bin::").append(Types->Value);
  84                 if (appsetting.empty() == false && _config->Exists(appsetting) == true) {
  85                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  86                         if (app.empty() == false && FileExists(app) == false)
  87                                 continue;
  88                 }
  89                 types.push_back(Types->Tag);
  90         }
  91
  92         return types;
  93 }
  94                                                                         /*}}}*/
  95 // GetLanguages - Return Vector of Language Codes                       /*{{{*/
  96 // ---------------------------------------------------------------------
  97 /* return a vector of language codes in the prefered order.
  98    the special word "environment" will be replaced with the long and the short
  99    code of the local settings and it will be insured that this will not add
 100    duplicates. So in an german local the setting "environment, de_DE, en, de"
 101    will result in "de_DE, de, en".
 102    The special word "none" is the stopcode for the not-All code vector */
 103 std::vector<std::string> const Configuration::getLanguages(bool const &All,
 104                                 bool const &Cached, char const ** const Locale) {
 105         using std::string;
 106
 107         // The detection is boring and has a lot of cornercases,
 108         // so we cache the results to calculated it only once.
 109         std::vector<string> static allCodes;
 110         std::vector<string> static codes;
 111
 112         // we have something in the cache
 113         if (codes.empty() == false || allCodes.empty() == false) {
 114                 if (Cached == true) {
 115                         if(All == true && allCodes.empty() == false)
 116                                 return allCodes;
 117                         else
 118                                 return codes;
 119                 } else {
 120                         allCodes.clear();
 121                         codes.clear();
 122                 }
 123         }
 124
 125         // Include all Language codes we have a Translation file for in /var/lib/apt/lists
 126         // so they will be all included in the Cache.
 127         std::vector<string> builtin;
 128         DIR *D = opendir(_config->FindDir("Dir::State::lists").c_str());
 129         if (D != 0) {
 130                 builtin.push_back("none");
 131                 for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
 132                         string const name = Ent->d_name;
 133                         size_t const foundDash = name.rfind("-");
 134                         size_t const foundUnderscore = name.rfind("_");
 135                         if (foundDash == string::npos || foundUnderscore == string::npos ||
 136                             foundDash <= foundUnderscore ||
 137                             name.substr(foundUnderscore+1, foundDash-(foundUnderscore+1)) != "Translation")
 138                                 continue;
 139                         string const c = name.substr(foundDash+1);
 140                         if (unlikely(c.empty() == true) || c == "en")
 141                                 continue;
 142                         // Skip unusual files, like backups or that alike
 143                         string::const_iterator s = c.begin();
 144                         for (;s != c.end(); ++s) {
 145                                 if (isalpha(*s) == 0)
 146                                         break;
 147                         }
 148                         if (s != c.end())
 149                                 continue;
 150                         if (std::find(builtin.begin(), builtin.end(), c) != builtin.end())
 151                                 continue;
 152                         builtin.push_back(c);
 153                 }
 154         }
 155         closedir(D);
 156
 157         // get the environment language codes: LC_MESSAGES (and later LANGUAGE)
 158         // we extract both, a long and a short code and then we will
 159         // check if we actually need both (rare) or if the short is enough
 160         string const envMsg = string(Locale == 0 ? std::setlocale(LC_MESSAGES, NULL) : *Locale);
 161         size_t const lenShort = (envMsg.find('_') != string::npos) ? envMsg.find('_') : 2;
 162         size_t const lenLong = (envMsg.find_first_of(".@") != string::npos) ? envMsg.find_first_of(".@") : (lenShort + 3);
 163
 164         string envLong = envMsg.substr(0,lenLong);
 165         string const envShort = envLong.substr(0,lenShort);
 166         bool envLongIncluded = true;
 167
 168         // first cornercase: LANG=C, so we use only "en" Translation
 169         if (envLong == "C") {
 170                 codes.push_back("en");
 171                 allCodes = codes;
 172                 allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
 173                 if (All == true)
 174                         return allCodes;
 175                 else
 176                         return codes;
 177         }
 178
 179         // to save the servers from unneeded queries, we only try also long codes
 180         // for languages it is realistic to have a long code translation file…
 181         // TODO: Improve translation acquire system to drop them dynamic
 182         char const *needLong[] = { "cs", "en", "pt", "sv", "zh", NULL };
 183         if (envLong != envShort) {
 184                 for (char const **l = needLong; *l != NULL; l++)
 185                         if (envShort.compare(*l) == 0) {
 186                                 envLongIncluded = false;
 187                                 break;
 188                         }
 189         }
 190
 191         // we don't add the long code, but we allow the user to do so
 192         if (envLongIncluded == true)
 193                 envLong.clear();
 194
 195         // FIXME: Remove support for the old APT::Acquire::Translation
 196         // it was undocumented and so it should be not very widthly used
 197         string const oldAcquire = _config->Find("APT::Acquire::Translation","");
 198         if (oldAcquire.empty() == false && oldAcquire != "environment") {
 199                 if (oldAcquire != "none")
 200                         codes.push_back(oldAcquire);
 201                 codes.push_back("en");
 202                 allCodes = codes;
 203                 for (std::vector<string>::const_iterator b = builtin.begin();
 204                      b != builtin.end(); ++b)
 205                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 206                                 allCodes.push_back(*b);
 207                 if (All == true)
 208                         return allCodes;
 209                 else
 210                         return codes;
 211         }
 212
 213         // It is very likely we will need to environment codes later,
 214         // so let us generate them now from LC_MESSAGES and LANGUAGE
 215         std::vector<string> environment;
 216         // take care of LC_MESSAGES
 217         if (envLongIncluded == false)
 218                 environment.push_back(envLong);
 219         environment.push_back(envShort);
 220         // take care of LANGUAGE
 221         const char *language_env = getenv("LANGUAGE") == 0 ? "" : getenv("LANGUAGE");
 222         string envLang = Locale == 0 ? language_env : *(Locale+1);
 223         if (envLang.empty() == false) {
 224                 std::vector<string> env = ExplodeString(envLang,':');
 225                 short addedLangs = 0; // add a maximum of 3 fallbacks from the environment
 226                 for (std::vector<string>::const_iterator e = env.begin();
 227                      e != env.end() && addedLangs < 3; ++e) {
 228                         if (unlikely(e->empty() == true) || *e == "en")
 229                                 continue;
 230                         if (*e == envLong || *e == envShort)
 231                                 continue;
 232                         if (std::find(environment.begin(), environment.end(), *e) != environment.end())
 233                                 continue;
 234                         if (e->find('_') != string::npos) {
 235                                 // Drop LongCodes here - ShortCodes are also included
 236                                 string const shorty = e->substr(0, e->find('_'));
 237                                 char const **n = needLong;
 238                                 for (; *n != NULL; ++n)
 239                                         if (shorty == *n)
 240                                                 break;
 241                                 if (*n == NULL)
 242                                         continue;
 243                         }
 244                         ++addedLangs;
 245                         environment.push_back(*e);
 246                 }
 247         }
 248
 249         // Support settings like Acquire::Translation=none on the command line to
 250         // override the configuration settings vector of languages.
 251         string const forceLang = _config->Find("Acquire::Languages","");
 252         if (forceLang.empty() == false) {
 253                 if (forceLang == "environment") {
 254                         codes = environment;
 255                 } else if (forceLang != "none")
 256                         codes.push_back(forceLang);
 257                 allCodes = codes;
 258                 for (std::vector<string>::const_iterator b = builtin.begin();
 259                      b != builtin.end(); ++b)
 260                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 261                                 allCodes.push_back(*b);
 262                 if (All == true)
 263                         return allCodes;
 264                 else
 265                         return codes;
 266         }
 267
 268         std::vector<string> const lang = _config->FindVector("Acquire::Languages");
 269         // the default setting -> "environment, en"
 270         if (lang.empty() == true) {
 271                 codes = environment;
 272                 if (envShort != "en")
 273                         codes.push_back("en");
 274                 allCodes = codes;
 275                 for (std::vector<string>::const_iterator b = builtin.begin();
 276                      b != builtin.end(); ++b)
 277                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 278                                 allCodes.push_back(*b);
 279                 if (All == true)
 280                         return allCodes;
 281                 else
 282                         return codes;
 283         }
 284
 285         // the configs define the order, so add the environment
 286         // then needed and ensure the codes are not listed twice.
 287         bool noneSeen = false;
 288         for (std::vector<string>::const_iterator l = lang.begin();
 289              l != lang.end(); l++) {
 290                 if (*l == "environment") {
 291                         for (std::vector<string>::const_iterator e = environment.begin();
 292                              e != environment.end(); ++e) {
 293                                 if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
 294                                         continue;
 295                                 if (noneSeen == false)
 296                                         codes.push_back(*e);
 297                                 allCodes.push_back(*e);
 298                         }
 299                         continue;
 300                 } else if (*l == "none") {
 301                         noneSeen = true;
 302                         continue;
 303                 } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
 304                         continue;
 305
 306                 if (noneSeen == false)
 307                         codes.push_back(*l);
 308                 allCodes.push_back(*l);
 309         }
 310
 311         for (std::vector<string>::const_iterator b = builtin.begin();
 312              b != builtin.end(); ++b)
 313                 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 314                         allCodes.push_back(*b);
 315
 316         if (All == true)
 317                 return allCodes;
 318         else
 319                 return codes;
 320 }
 321                                                                         /*}}}*/
 322 }