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/error.h>
  14 #include <apt-pkg/fileutl.h>
  15 #include <apt-pkg/macros.h>
  16 #include <apt-pkg/strutl.h>
  17
  18 #include <sys/types.h>
  19 #include <dirent.h>
  20 #include <stdio.h>
  21
  22 #include <algorithm>
  23 #include <string>
  24 #include <vector>
  25                                                                         /*}}}*/
  26 namespace APT {
  27 // getCompressionTypes - Return Vector of usbale compressiontypes       /*{{{*/
  28 // ---------------------------------------------------------------------
  29 /* return a vector of compression types in the prefered order. */
  30 std::vector<std::string>
  31 const Configuration::getCompressionTypes(bool const &Cached) {
  32         static std::vector<std::string> types;
  33         if (types.empty() == false) {
  34                 if (Cached == true)
  35                         return types;
  36                 else
  37                         types.clear();
  38         }
  39
  40         // setup the defaults for the compressiontypes => method mapping
  41         _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
  42         _config->CndSet("Acquire::CompressionTypes::xz","xz");
  43         _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
  44         _config->CndSet("Acquire::CompressionTypes::gz","gzip");
  45
  46         setDefaultConfigurationForCompressors();
  47
  48         // accept non-list order as override setting for config settings on commandline
  49         std::string const overrideOrder = _config->Find("Acquire::CompressionTypes::Order","");
  50         if (overrideOrder.empty() == false)
  51                 types.push_back(overrideOrder);
  52
  53         // load the order setting into our vector
  54         std::vector<std::string> const order = _config->FindVector("Acquire::CompressionTypes::Order");
  55         for (std::vector<std::string>::const_iterator o = order.begin();
  56              o != order.end(); ++o) {
  57                 if ((*o).empty() == true)
  58                         continue;
  59                 // ignore types we have no method ready to use
  60                 if (_config->Exists(string("Acquire::CompressionTypes::").append(*o)) == false)
  61                         continue;
  62                 // ignore types we have no app ready to use
  63                 string const appsetting = string("Dir::Bin::").append(*o);
  64                 if (_config->Exists(appsetting) == true) {
  65                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  66                         if (app.empty() == false && FileExists(app) == false)
  67                                 continue;
  68                 }
  69                 types.push_back(*o);
  70         }
  71
  72         // move again over the option tree to add all missing compression types
  73         ::Configuration::Item const *Types = _config->Tree("Acquire::CompressionTypes");
  74         if (Types != 0)
  75                 Types = Types->Child;
  76
  77         for (; Types != 0; Types = Types->Next) {
  78                 if (Types->Tag == "Order" || Types->Tag.empty() == true)
  79                         continue;
  80                 // ignore types we already have in the vector
  81                 if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
  82                         continue;
  83                 // ignore types we have no app ready to use
  84                 string const appsetting = string("Dir::Bin::").append(Types->Value);
  85                 if (appsetting.empty() == false && _config->Exists(appsetting) == true) {
  86                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  87                         if (app.empty() == false && FileExists(app) == false)
  88                                 continue;
  89                 }
  90                 types.push_back(Types->Tag);
  91         }
  92
  93         // add the special "uncompressed" type
  94         if (std::find(types.begin(), types.end(), "uncompressed") == types.end())
  95         {
  96                 string const uncompr = _config->FindFile("Dir::Bin::uncompressed", "");
  97                 if (uncompr.empty() == true || FileExists(uncompr) == true)
  98                         types.push_back("uncompressed");
  99         }
 100
 101         return types;
 102 }
 103                                                                         /*}}}*/
 104 // GetLanguages - Return Vector of Language Codes                       /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* return a vector of language codes in the prefered order.
 107    the special word "environment" will be replaced with the long and the short
 108    code of the local settings and it will be insured that this will not add
 109    duplicates. So in an german local the setting "environment, de_DE, en, de"
 110    will result in "de_DE, de, en".
 111    The special word "none" is the stopcode for the not-All code vector */
 112 std::vector<std::string> const Configuration::getLanguages(bool const &All,
 113                                 bool const &Cached, char const ** const Locale) {
 114         using std::string;
 115
 116         // The detection is boring and has a lot of cornercases,
 117         // so we cache the results to calculated it only once.
 118         std::vector<string> static allCodes;
 119         std::vector<string> static codes;
 120
 121         // we have something in the cache
 122         if (codes.empty() == false || allCodes.empty() == false) {
 123                 if (Cached == true) {
 124                         if(All == true && allCodes.empty() == false)
 125                                 return allCodes;
 126                         else
 127                                 return codes;
 128                 } else {
 129                         allCodes.clear();
 130                         codes.clear();
 131                 }
 132         }
 133
 134         // Include all Language codes we have a Translation file for in /var/lib/apt/lists
 135         // so they will be all included in the Cache.
 136         std::vector<string> builtin;
 137         DIR *D = opendir(_config->FindDir("Dir::State::lists").c_str());
 138         if (D != 0) {
 139                 builtin.push_back("none");
 140                 for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
 141                         string const name = Ent->d_name;
 142                         size_t const foundDash = name.rfind("-");
 143                         size_t const foundUnderscore = name.rfind("_", foundDash);
 144                         if (foundDash == string::npos || foundUnderscore == string::npos ||
 145                             foundDash <= foundUnderscore ||
 146                             name.substr(foundUnderscore+1, foundDash-(foundUnderscore+1)) != "Translation")
 147                                 continue;
 148                         string const c = name.substr(foundDash+1);
 149                         if (unlikely(c.empty() == true) || c == "en")
 150                                 continue;
 151                         // Skip unusual files, like backups or that alike
 152                         string::const_iterator s = c.begin();
 153                         for (;s != c.end(); ++s) {
 154                                 if (isalpha(*s) == 0 && *s != '_')
 155                                         break;
 156                         }
 157                         if (s != c.end())
 158                                 continue;
 159                         if (std::find(builtin.begin(), builtin.end(), c) != builtin.end())
 160                                 continue;
 161                         builtin.push_back(c);
 162                 }
 163         }
 164         closedir(D);
 165
 166         // FIXME: Remove support for the old APT::Acquire::Translation
 167         // it was undocumented and so it should be not very widthly used
 168         string const oldAcquire = _config->Find("APT::Acquire::Translation","");
 169         if (oldAcquire.empty() == false && oldAcquire != "environment") {
 170                 // TRANSLATORS: the two %s are APT configuration options
 171                 _error->Notice("Option '%s' is deprecated. Please use '%s' instead, see 'man 5 apt.conf' for details.",
 172                                 "APT::Acquire::Translation", "Acquire::Languages");
 173                 if (oldAcquire != "none")
 174                         codes.push_back(oldAcquire);
 175                 codes.push_back("en");
 176                 allCodes = codes;
 177                 for (std::vector<string>::const_iterator b = builtin.begin();
 178                      b != builtin.end(); ++b)
 179                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 180                                 allCodes.push_back(*b);
 181                 if (All == true)
 182                         return allCodes;
 183                 else
 184                         return codes;
 185         }
 186
 187         // get the environment language codes: LC_MESSAGES (and later LANGUAGE)
 188         // we extract both, a long and a short code and then we will
 189         // check if we actually need both (rare) or if the short is enough
 190         string const envMsg = string(Locale == 0 ? std::setlocale(LC_MESSAGES, NULL) : *Locale);
 191         size_t const lenShort = (envMsg.find('_') != string::npos) ? envMsg.find('_') : 2;
 192         size_t const lenLong = (envMsg.find_first_of(".@") != string::npos) ? envMsg.find_first_of(".@") : (lenShort + 3);
 193
 194         string const envLong = envMsg.substr(0,lenLong);
 195         string const envShort = envLong.substr(0,lenShort);
 196
 197         // It is very likely we will need the environment codes later,
 198         // so let us generate them now from LC_MESSAGES and LANGUAGE
 199         std::vector<string> environment;
 200         if (envShort != "C") {
 201                 // take care of LC_MESSAGES
 202                 if (envLong != envShort)
 203                         environment.push_back(envLong);
 204                 environment.push_back(envShort);
 205                 // take care of LANGUAGE
 206                 const char *language_env = getenv("LANGUAGE") == 0 ? "" : getenv("LANGUAGE");
 207                 string envLang = Locale == 0 ? language_env : *(Locale+1);
 208                 if (envLang.empty() == false) {
 209                         std::vector<string> env = VectorizeString(envLang,':');
 210                         short addedLangs = 0; // add a maximum of 3 fallbacks from the environment
 211                         for (std::vector<string>::const_iterator e = env.begin();
 212                              e != env.end() && addedLangs < 3; ++e) {
 213                                 if (unlikely(e->empty() == true) || *e == "en")
 214                                         continue;
 215                                 if (*e == envLong || *e == envShort)
 216                                         continue;
 217                                 if (std::find(environment.begin(), environment.end(), *e) != environment.end())
 218                                         continue;
 219                                 ++addedLangs;
 220                                 environment.push_back(*e);
 221                         }
 222                 }
 223         } else {
 224                 environment.push_back("en");
 225         }
 226
 227         // Support settings like Acquire::Languages=none on the command line to
 228         // override the configuration settings vector of languages.
 229         string const forceLang = _config->Find("Acquire::Languages","");
 230         if (forceLang.empty() == false) {
 231                 if (forceLang == "environment") {
 232                         codes = environment;
 233                 } else if (forceLang != "none")
 234                         codes.push_back(forceLang);
 235                 else //if (forceLang == "none")
 236                         builtin.clear();
 237                 allCodes = codes;
 238                 for (std::vector<string>::const_iterator b = builtin.begin();
 239                      b != builtin.end(); ++b)
 240                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 241                                 allCodes.push_back(*b);
 242                 if (All == true)
 243                         return allCodes;
 244                 else
 245                         return codes;
 246         }
 247
 248         // cornercase: LANG=C, so we use only "en" Translation
 249         if (envShort == "C") {
 250                 allCodes = codes = environment;
 251                 allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
 252                 if (All == true)
 253                         return allCodes;
 254                 else
 255                         return codes;
 256         }
 257
 258         std::vector<string> const lang = _config->FindVector("Acquire::Languages");
 259         // the default setting -> "environment, en"
 260         if (lang.empty() == true) {
 261                 codes = environment;
 262                 if (envShort != "en")
 263                         codes.push_back("en");
 264                 allCodes = codes;
 265                 for (std::vector<string>::const_iterator b = builtin.begin();
 266                      b != builtin.end(); ++b)
 267                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 268                                 allCodes.push_back(*b);
 269                 if (All == true)
 270                         return allCodes;
 271                 else
 272                         return codes;
 273         }
 274
 275         // the configs define the order, so add the environment
 276         // then needed and ensure the codes are not listed twice.
 277         bool noneSeen = false;
 278         for (std::vector<string>::const_iterator l = lang.begin();
 279              l != lang.end(); ++l) {
 280                 if (*l == "environment") {
 281                         for (std::vector<string>::const_iterator e = environment.begin();
 282                              e != environment.end(); ++e) {
 283                                 if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
 284                                         continue;
 285                                 if (noneSeen == false)
 286                                         codes.push_back(*e);
 287                                 allCodes.push_back(*e);
 288                         }
 289                         continue;
 290                 } else if (*l == "none") {
 291                         noneSeen = true;
 292                         continue;
 293                 } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
 294                         continue;
 295
 296                 if (noneSeen == false)
 297                         codes.push_back(*l);
 298                 allCodes.push_back(*l);
 299         }
 300
 301         for (std::vector<string>::const_iterator b = builtin.begin();
 302              b != builtin.end(); ++b)
 303                 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 304                         allCodes.push_back(*b);
 305
 306         if (All == true)
 307                 return allCodes;
 308         else
 309                 return codes;
 310 }
 311                                                                         /*}}}*/
 312 // getArchitectures - Return Vector of prefered Architectures           /*{{{*/
 313 std::vector<std::string> const Configuration::getArchitectures(bool const &Cached) {
 314         using std::string;
 315
 316         std::vector<string> static archs;
 317         if (likely(Cached == true) && archs.empty() == false)
 318                 return archs;
 319
 320         string const arch = _config->Find("APT::Architecture");
 321         archs = _config->FindVector("APT::Architectures");
 322
 323         if (unlikely(arch.empty() == true))
 324                 return archs;
 325
 326         // FIXME: It is a bit unclean to have debian specific code here…
 327         if (archs.empty() == true) {
 328                 archs.push_back(arch);
 329                 string dpkgcall = _config->Find("Dir::Bin::dpkg", "dpkg");
 330                 std::vector<string> const dpkgoptions = _config->FindVector("DPkg::options");
 331                 for (std::vector<string>::const_iterator o = dpkgoptions.begin();
 332                      o != dpkgoptions.end(); ++o)
 333                         dpkgcall.append(" ").append(*o);
 334                 dpkgcall.append(" --print-foreign-architectures 2> /dev/null");
 335                 FILE *dpkg = popen(dpkgcall.c_str(), "r");
 336                 char buf[1024];
 337                 if(dpkg != NULL) {
 338                         if (fgets(buf, sizeof(buf), dpkg) != NULL) {
 339                                 char* arch = strtok(buf, " ");
 340                                 while (arch != NULL) {
 341                                         for (; isspace(*arch) != 0; ++arch);
 342                                         if (arch[0] != '\0') {
 343                                                 char const* archend = arch;
 344                                                 for (; isspace(*archend) == 0 && *archend != '\0'; ++archend);
 345                                                 archs.push_back(string(arch, (archend - arch)));
 346                                         }
 347                                         arch = strtok(NULL, " ");
 348                                 }
 349                         }
 350                         pclose(dpkg);
 351                 }
 352                 return archs;
 353         }
 354
 355         if (archs.empty() == true ||
 356             std::find(archs.begin(), archs.end(), arch) == archs.end())
 357                 archs.insert(archs.begin(), arch);
 358
 359         // erase duplicates and empty strings
 360         for (std::vector<string>::reverse_iterator a = archs.rbegin();
 361              a != archs.rend(); ++a) {
 362                 if (a->empty() == true || std::find(a + 1, archs.rend(), *a) != archs.rend())
 363                         archs.erase(a.base()-1);
 364                 if (a == archs.rend())
 365                         break;
 366         }
 367
 368         return archs;
 369 }
 370                                                                         /*}}}*/
 371 // checkArchitecture - are we interested in the given Architecture?     /*{{{*/
 372 bool const Configuration::checkArchitecture(std::string const &Arch) {
 373         if (Arch == "all")
 374                 return true;
 375         std::vector<std::string> const archs = getArchitectures(true);
 376         return (std::find(archs.begin(), archs.end(), Arch) != archs.end());
 377 }
 378                                                                         /*}}}*/
 379 // setDefaultConfigurationForCompressors                                /*{{{*/
 380 void Configuration::setDefaultConfigurationForCompressors() {
 381         // Set default application paths to check for optional compression types
 382         _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
 383         _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
 384         _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
 385 }
 386                                                                         /*}}}*/
 387 // getCompressors - Return Vector of usbale compressors                 /*{{{*/
 388 // ---------------------------------------------------------------------
 389 /* return a vector of compressors used by apt-ftparchive in the
 390    multicompress functionality or to detect data.tar files */
 391 std::vector<APT::Configuration::Compressor>
 392 const Configuration::getCompressors(bool const Cached) {
 393         static std::vector<APT::Configuration::Compressor> compressors;
 394         if (compressors.empty() == false) {
 395                 if (Cached == true)
 396                         return compressors;
 397                 else
 398                         compressors.clear();
 399         }
 400
 401         setDefaultConfigurationForCompressors();
 402
 403         compressors.push_back(Compressor(".", "", "", "", "", 1));
 404         if (_config->Exists("Dir::Bin::gzip") == false || FileExists(_config->FindFile("Dir::Bin::gzip")) == true)
 405                 compressors.push_back(Compressor("gzip",".gz","gzip","-9n","-d",2));
 406         if (_config->Exists("Dir::Bin::bzip2") == false || FileExists(_config->FindFile("Dir::Bin::bzip2")) == true)
 407                 compressors.push_back(Compressor("bzip2",".bz2","bzip2","-9","-d",3));
 408         if (_config->Exists("Dir::Bin::lzma") == false || FileExists(_config->FindFile("Dir::Bin::lzma")) == true)
 409                 compressors.push_back(Compressor("lzma",".lzma","lzma","-9","-d",4));
 410         if (_config->Exists("Dir::Bin::xz") == false || FileExists(_config->FindFile("Dir::Bin::xz")) == true)
 411                 compressors.push_back(Compressor("xz",".xz","xz","-6","-d",5));
 412
 413         std::vector<std::string> const comp = _config->FindVector("APT::Compressor");
 414         for (std::vector<std::string>::const_iterator c = comp.begin();
 415              c != comp.end(); ++c) {
 416                 if (*c == "." || *c == "gzip" || *c == "bzip2" || *c == "lzma" || *c == "xz")
 417                         continue;
 418                 compressors.push_back(Compressor(c->c_str(), std::string(".").append(*c).c_str(), c->c_str(), "-9", "-d", 100));
 419         }
 420
 421         return compressors;
 422 }
 423                                                                         /*}}}*/
 424 // getCompressorExtensions - supported data.tar extensions              /*{{{*/
 425 // ---------------------------------------------------------------------
 426 /* */
 427 std::vector<std::string> const Configuration::getCompressorExtensions() {
 428         std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
 429         std::vector<std::string> ext;
 430         for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
 431              c != compressors.end(); ++c)
 432                 if (c->Extension.empty() == false && c->Extension != ".")
 433                         ext.push_back(c->Extension);
 434         return ext;
 435 }
 436                                                                         /*}}}*/
 437 // Compressor constructor                                               /*{{{*/
 438 // ---------------------------------------------------------------------
 439 /* */
 440 Configuration::Compressor::Compressor(char const *name, char const *extension,
 441                                       char const *binary,
 442                                       char const *compressArg, char const *uncompressArg,
 443                                       unsigned short const cost) {
 444         std::string const config = string("APT:Compressor::").append(name).append("::");
 445         Name = _config->Find(std::string(config).append("Name"), name);
 446         Extension = _config->Find(std::string(config).append("Extension"), extension);
 447         Binary = _config->Find(std::string(config).append("Binary"), binary);
 448         Cost = _config->FindI(std::string(config).append("Cost"), cost);
 449         std::string const compConf = std::string(config).append("CompressArg");
 450         if (_config->Exists(compConf) == true)
 451                 CompressArgs = _config->FindVector(compConf);
 452         else if (compressArg != NULL)
 453                 CompressArgs.push_back(compressArg);
 454         std::string const uncompConf = std::string(config).append("UncompressArg");
 455         if (_config->Exists(uncompConf) == true)
 456                 UncompressArgs = _config->FindVector(uncompConf);
 457         else if (uncompressArg != NULL)
 458                 UncompressArgs.push_back(uncompressArg);
 459 }
 460                                                                         /*}}}*/
 461 }