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 <config.h>
  12
  13 #include <apt-pkg/aptconfiguration.h>
  14 #include <apt-pkg/configuration.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/fileutl.h>
  17 #include <apt-pkg/macros.h>
  18 #include <apt-pkg/strutl.h>
  19
  20 #include <sys/types.h>
  21 #include <dirent.h>
  22 #include <stdio.h>
  23 #include <fcntl.h>
  24
  25 #include <algorithm>
  26 #include <string>
  27 #include <vector>
  28                                                                         /*}}}*/
  29 namespace APT {
  30 // getCompressionTypes - Return Vector of usbale compressiontypes       /*{{{*/
  31 // ---------------------------------------------------------------------
  32 /* return a vector of compression types in the prefered order. */
  33 std::vector<std::string>
  34 const Configuration::getCompressionTypes(bool const &Cached) {
  35         static std::vector<std::string> types;
  36         if (types.empty() == false) {
  37                 if (Cached == true)
  38                         return types;
  39                 else
  40                         types.clear();
  41         }
  42
  43         // setup the defaults for the compressiontypes => method mapping
  44         _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
  45         _config->CndSet("Acquire::CompressionTypes::xz","xz");
  46         _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
  47         _config->CndSet("Acquire::CompressionTypes::gz","gzip");
  48
  49         setDefaultConfigurationForCompressors();
  50
  51         // accept non-list order as override setting for config settings on commandline
  52         std::string const overrideOrder = _config->Find("Acquire::CompressionTypes::Order","");
  53         if (overrideOrder.empty() == false)
  54                 types.push_back(overrideOrder);
  55
  56         // load the order setting into our vector
  57         std::vector<std::string> const order = _config->FindVector("Acquire::CompressionTypes::Order");
  58         for (std::vector<std::string>::const_iterator o = order.begin();
  59              o != order.end(); ++o) {
  60                 if ((*o).empty() == true)
  61                         continue;
  62                 // ignore types we have no method ready to use
  63                 if (_config->Exists(std::string("Acquire::CompressionTypes::").append(*o)) == false)
  64                         continue;
  65                 // ignore types we have no app ready to use
  66                 std::string const appsetting = std::string("Dir::Bin::").append(*o);
  67                 if (_config->Exists(appsetting) == true) {
  68                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  69                         if (app.empty() == false && FileExists(app) == false)
  70                                 continue;
  71                 }
  72                 types.push_back(*o);
  73         }
  74
  75         // move again over the option tree to add all missing compression types
  76         ::Configuration::Item const *Types = _config->Tree("Acquire::CompressionTypes");
  77         if (Types != 0)
  78                 Types = Types->Child;
  79
  80         for (; Types != 0; Types = Types->Next) {
  81                 if (Types->Tag == "Order" || Types->Tag.empty() == true)
  82                         continue;
  83                 // ignore types we already have in the vector
  84                 if (std::find(types.begin(),types.end(),Types->Tag) != types.end())
  85                         continue;
  86                 // ignore types we have no app ready to use
  87                 std::string const appsetting = std::string("Dir::Bin::").append(Types->Value);
  88                 if (appsetting.empty() == false && _config->Exists(appsetting) == true) {
  89                         std::string const app = _config->FindFile(appsetting.c_str(), "");
  90                         if (app.empty() == false && FileExists(app) == false)
  91                                 continue;
  92                 }
  93                 types.push_back(Types->Tag);
  94         }
  95
  96         // add the special "uncompressed" type
  97         if (std::find(types.begin(), types.end(), "uncompressed") == types.end())
  98         {
  99                 std::string const uncompr = _config->FindFile("Dir::Bin::uncompressed", "");
 100                 if (uncompr.empty() == true || FileExists(uncompr) == true)
 101                         types.push_back("uncompressed");
 102         }
 103
 104         return types;
 105 }
 106                                                                         /*}}}*/
 107 // GetLanguages - Return Vector of Language Codes                       /*{{{*/
 108 // ---------------------------------------------------------------------
 109 /* return a vector of language codes in the prefered order.
 110    the special word "environment" will be replaced with the long and the short
 111    code of the local settings and it will be insured that this will not add
 112    duplicates. So in an german local the setting "environment, de_DE, en, de"
 113    will result in "de_DE, de, en".
 114    The special word "none" is the stopcode for the not-All code vector */
 115 std::vector<std::string> const Configuration::getLanguages(bool const &All,
 116                                 bool const &Cached, char const ** const Locale) {
 117         using std::string;
 118
 119         // The detection is boring and has a lot of cornercases,
 120         // so we cache the results to calculated it only once.
 121         std::vector<string> static allCodes;
 122         std::vector<string> static codes;
 123
 124         // we have something in the cache
 125         if (codes.empty() == false || allCodes.empty() == false) {
 126                 if (Cached == true) {
 127                         if(All == true && allCodes.empty() == false)
 128                                 return allCodes;
 129                         else
 130                                 return codes;
 131                 } else {
 132                         allCodes.clear();
 133                         codes.clear();
 134                 }
 135         }
 136
 137         // Include all Language codes we have a Translation file for in /var/lib/apt/lists
 138         // so they will be all included in the Cache.
 139         std::vector<string> builtin;
 140         DIR *D = opendir(_config->FindDir("Dir::State::lists").c_str());
 141         if (D != 0) {
 142                 builtin.push_back("none");
 143                 for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) {
 144                         string const name = Ent->d_name;
 145                         size_t const foundDash = name.rfind("-");
 146                         size_t const foundUnderscore = name.rfind("_", foundDash);
 147                         if (foundDash == string::npos || foundUnderscore == string::npos ||
 148                             foundDash <= foundUnderscore ||
 149                             name.substr(foundUnderscore+1, foundDash-(foundUnderscore+1)) != "Translation")
 150                                 continue;
 151                         string const c = name.substr(foundDash+1);
 152                         if (unlikely(c.empty() == true) || c == "en")
 153                                 continue;
 154                         // Skip unusual files, like backups or that alike
 155                         string::const_iterator s = c.begin();
 156                         for (;s != c.end(); ++s) {
 157                                 if (isalpha(*s) == 0 && *s != '_')
 158                                         break;
 159                         }
 160                         if (s != c.end())
 161                                 continue;
 162                         if (std::find(builtin.begin(), builtin.end(), c) != builtin.end())
 163                                 continue;
 164                         builtin.push_back(c);
 165                 }
 166         }
 167         closedir(D);
 168
 169         // FIXME: Remove support for the old APT::Acquire::Translation
 170         // it was undocumented and so it should be not very widthly used
 171         string const oldAcquire = _config->Find("APT::Acquire::Translation","");
 172         if (oldAcquire.empty() == false && oldAcquire != "environment") {
 173                 // TRANSLATORS: the two %s are APT configuration options
 174                 _error->Notice("Option '%s' is deprecated. Please use '%s' instead, see 'man 5 apt.conf' for details.",
 175                                 "APT::Acquire::Translation", "Acquire::Languages");
 176                 if (oldAcquire != "none")
 177                         codes.push_back(oldAcquire);
 178                 codes.push_back("en");
 179                 allCodes = codes;
 180                 for (std::vector<string>::const_iterator b = builtin.begin();
 181                      b != builtin.end(); ++b)
 182                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 183                                 allCodes.push_back(*b);
 184                 if (All == true)
 185                         return allCodes;
 186                 else
 187                         return codes;
 188         }
 189
 190         // get the environment language codes: LC_MESSAGES (and later LANGUAGE)
 191         // we extract both, a long and a short code and then we will
 192         // check if we actually need both (rare) or if the short is enough
 193         string const envMsg = string(Locale == 0 ? std::setlocale(LC_MESSAGES, NULL) : *Locale);
 194         size_t const lenShort = (envMsg.find('_') != string::npos) ? envMsg.find('_') : 2;
 195         size_t const lenLong = (envMsg.find_first_of(".@") != string::npos) ? envMsg.find_first_of(".@") : (lenShort + 3);
 196
 197         string const envLong = envMsg.substr(0,lenLong);
 198         string const envShort = envLong.substr(0,lenShort);
 199
 200         // It is very likely we will need the environment codes later,
 201         // so let us generate them now from LC_MESSAGES and LANGUAGE
 202         std::vector<string> environment;
 203         if (envShort != "C") {
 204                 // take care of LC_MESSAGES
 205                 if (envLong != envShort)
 206                         environment.push_back(envLong);
 207                 environment.push_back(envShort);
 208                 // take care of LANGUAGE
 209                 const char *language_env = getenv("LANGUAGE") == 0 ? "" : getenv("LANGUAGE");
 210                 string envLang = Locale == 0 ? language_env : *(Locale+1);
 211                 if (envLang.empty() == false) {
 212                         std::vector<string> env = VectorizeString(envLang,':');
 213                         short addedLangs = 0; // add a maximum of 3 fallbacks from the environment
 214                         for (std::vector<string>::const_iterator e = env.begin();
 215                              e != env.end() && addedLangs < 3; ++e) {
 216                                 if (unlikely(e->empty() == true) || *e == "en")
 217                                         continue;
 218                                 if (*e == envLong || *e == envShort)
 219                                         continue;
 220                                 if (std::find(environment.begin(), environment.end(), *e) != environment.end())
 221                                         continue;
 222                                 ++addedLangs;
 223                                 environment.push_back(*e);
 224                         }
 225                 }
 226         } else {
 227                 environment.push_back("en");
 228         }
 229
 230         // Support settings like Acquire::Languages=none on the command line to
 231         // override the configuration settings vector of languages.
 232         string const forceLang = _config->Find("Acquire::Languages","");
 233         if (forceLang.empty() == false) {
 234                 if (forceLang == "environment") {
 235                         codes = environment;
 236                 } else if (forceLang != "none")
 237                         codes.push_back(forceLang);
 238                 else //if (forceLang == "none")
 239                         builtin.clear();
 240                 allCodes = codes;
 241                 for (std::vector<string>::const_iterator b = builtin.begin();
 242                      b != builtin.end(); ++b)
 243                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 244                                 allCodes.push_back(*b);
 245                 if (All == true)
 246                         return allCodes;
 247                 else
 248                         return codes;
 249         }
 250
 251         // cornercase: LANG=C, so we use only "en" Translation
 252         if (envShort == "C") {
 253                 allCodes = codes = environment;
 254                 allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
 255                 if (All == true)
 256                         return allCodes;
 257                 else
 258                         return codes;
 259         }
 260
 261         std::vector<string> const lang = _config->FindVector("Acquire::Languages");
 262         // the default setting -> "environment, en"
 263         if (lang.empty() == true) {
 264                 codes = environment;
 265                 if (envShort != "en")
 266                         codes.push_back("en");
 267                 allCodes = codes;
 268                 for (std::vector<string>::const_iterator b = builtin.begin();
 269                      b != builtin.end(); ++b)
 270                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 271                                 allCodes.push_back(*b);
 272                 if (All == true)
 273                         return allCodes;
 274                 else
 275                         return codes;
 276         }
 277
 278         // the configs define the order, so add the environment
 279         // then needed and ensure the codes are not listed twice.
 280         bool noneSeen = false;
 281         for (std::vector<string>::const_iterator l = lang.begin();
 282              l != lang.end(); ++l) {
 283                 if (*l == "environment") {
 284                         for (std::vector<string>::const_iterator e = environment.begin();
 285                              e != environment.end(); ++e) {
 286                                 if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
 287                                         continue;
 288                                 if (noneSeen == false)
 289                                         codes.push_back(*e);
 290                                 allCodes.push_back(*e);
 291                         }
 292                         continue;
 293                 } else if (*l == "none") {
 294                         noneSeen = true;
 295                         continue;
 296                 } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
 297                         continue;
 298
 299                 if (noneSeen == false)
 300                         codes.push_back(*l);
 301                 allCodes.push_back(*l);
 302         }
 303
 304         for (std::vector<string>::const_iterator b = builtin.begin();
 305              b != builtin.end(); ++b)
 306                 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 307                         allCodes.push_back(*b);
 308
 309         if (All == true)
 310                 return allCodes;
 311         else
 312                 return codes;
 313 }
 314                                                                         /*}}}*/
 315 // getArchitectures - Return Vector of prefered Architectures           /*{{{*/
 316 std::vector<std::string> const Configuration::getArchitectures(bool const &Cached) {
 317         using std::string;
 318
 319         std::vector<string> static archs;
 320         if (likely(Cached == true) && archs.empty() == false)
 321                 return archs;
 322
 323         string const arch = _config->Find("APT::Architecture");
 324         archs = _config->FindVector("APT::Architectures");
 325
 326         if (unlikely(arch.empty() == true))
 327                 return archs;
 328
 329         // FIXME: It is a bit unclean to have debian specific code here…
 330         if (archs.empty() == true) {
 331                 archs.push_back(arch);
 332
 333                 // Generate the base argument list for dpkg
 334                 std::vector<const char *> Args;
 335                 string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 336                 {
 337                         string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
 338                         size_t dpkgChrootLen = dpkgChrootDir.length();
 339                         if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0) {
 340                                 if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
 341                                         --dpkgChrootLen;
 342                                 Tmp = Tmp.substr(dpkgChrootLen);
 343                         }
 344                 }
 345                 Args.push_back(Tmp.c_str());
 346
 347                 // Stick in any custom dpkg options
 348                 ::Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 349                 if (Opts != 0) {
 350                         Opts = Opts->Child;
 351                         for (; Opts != 0; Opts = Opts->Next)
 352                         {
 353                                 if (Opts->Value.empty() == true)
 354                                         continue;
 355                                 Args.push_back(Opts->Value.c_str());
 356                         }
 357                 }
 358
 359                 Args.push_back("--print-foreign-architectures");
 360                 Args.push_back(NULL);
 361
 362                 int external[2] = {-1, -1};
 363                 if (pipe(external) != 0)
 364                 {
 365                         _error->WarningE("getArchitecture", "Can't create IPC pipe for dpkg --print-foreign-architectures");
 366                         return archs;
 367                 }
 368
 369                 pid_t dpkgMultiArch = ExecFork();
 370                 if (dpkgMultiArch == 0) {
 371                         close(external[0]);
 372                         std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
 373                         if (chrootDir != "/" && chroot(chrootDir.c_str()) != 0)
 374                                 _error->WarningE("getArchitecture", "Couldn't chroot into %s for dpkg --print-foreign-architectures", chrootDir.c_str());
 375                         int const nullfd = open("/dev/null", O_RDONLY);
 376                         dup2(nullfd, STDIN_FILENO);
 377                         dup2(external[1], STDOUT_FILENO);
 378                         dup2(nullfd, STDERR_FILENO);
 379                         execvp(Args[0], (char**) &Args[0]);
 380                         _error->WarningE("getArchitecture", "Can't detect foreign architectures supported by dpkg!");
 381                         _exit(100);
 382                 }
 383                 close(external[1]);
 384
 385                 FILE *dpkg = fdopen(external[0], "r");
 386                 char buf[1024];
 387                 if(dpkg != NULL) {
 388                         while (fgets(buf, sizeof(buf), dpkg) != NULL) {
 389                                 char* arch = strtok(buf, " ");
 390                                 while (arch != NULL) {
 391                                         for (; isspace(*arch) != 0; ++arch);
 392                                         if (arch[0] != '\0') {
 393                                                 char const* archend = arch;
 394                                                 for (; isspace(*archend) == 0 && *archend != '\0'; ++archend);
 395                                                 string a(arch, (archend - arch));
 396                                                 if (std::find(archs.begin(), archs.end(), a) == archs.end())
 397                                                         archs.push_back(a);
 398                                         }
 399                                         arch = strtok(NULL, " ");
 400                                 }
 401                         }
 402                         fclose(dpkg);
 403                 }
 404                 ExecWait(dpkgMultiArch, "dpkg --print-foreign-architectures", true);
 405                 return archs;
 406         }
 407
 408         if (archs.empty() == true ||
 409             std::find(archs.begin(), archs.end(), arch) == archs.end())
 410                 archs.insert(archs.begin(), arch);
 411
 412         // erase duplicates and empty strings
 413         for (std::vector<string>::reverse_iterator a = archs.rbegin();
 414              a != archs.rend(); ++a) {
 415                 if (a->empty() == true || std::find(a + 1, archs.rend(), *a) != archs.rend())
 416                         archs.erase(a.base()-1);
 417                 if (a == archs.rend())
 418                         break;
 419         }
 420
 421         return archs;
 422 }
 423                                                                         /*}}}*/
 424 // checkArchitecture - are we interested in the given Architecture?     /*{{{*/
 425 bool const Configuration::checkArchitecture(std::string const &Arch) {
 426         if (Arch == "all")
 427                 return true;
 428         std::vector<std::string> const archs = getArchitectures(true);
 429         return (std::find(archs.begin(), archs.end(), Arch) != archs.end());
 430 }
 431                                                                         /*}}}*/
 432 // setDefaultConfigurationForCompressors                                /*{{{*/
 433 void Configuration::setDefaultConfigurationForCompressors() {
 434         // Set default application paths to check for optional compression types
 435         _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
 436         _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
 437         if (FileExists(_config->FindFile("Dir::Bin::xz")) == true) {
 438                 _config->CndSet("Dir::Bin::lzma", _config->Find("Dir::Bin::xz"));
 439                 _config->Set("APT::Compressor::lzma::Binary", "xz");
 440                 if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
 441                         _config->Set("APT::Compressor::lzma::CompressArg::", "--format=lzma");
 442                         _config->Set("APT::Compressor::lzma::CompressArg::", "-9");
 443                 }
 444                 if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
 445                         _config->Set("APT::Compressor::lzma::UncompressArg::", "--format=lzma");
 446                         _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
 447                 }
 448         } else {
 449                 _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
 450                 if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
 451                         _config->Set("APT::Compressor::lzma::CompressArg::", "--suffix=");
 452                         _config->Set("APT::Compressor::lzma::CompressArg::", "-9");
 453                 }
 454                 if (_config->Exists("APT::Compressor::lzma::UncompressArg") == false) {
 455                         _config->Set("APT::Compressor::lzma::UncompressArg::", "--suffix=");
 456                         _config->Set("APT::Compressor::lzma::UncompressArg::", "-d");
 457                 }
 458         }
 459 }
 460                                                                         /*}}}*/
 461 // getCompressors - Return Vector of usbale compressors                 /*{{{*/
 462 // ---------------------------------------------------------------------
 463 /* return a vector of compressors used by apt-ftparchive in the
 464    multicompress functionality or to detect data.tar files */
 465 std::vector<APT::Configuration::Compressor>
 466 const Configuration::getCompressors(bool const Cached) {
 467         static std::vector<APT::Configuration::Compressor> compressors;
 468         if (compressors.empty() == false) {
 469                 if (Cached == true)
 470                         return compressors;
 471                 else
 472                         compressors.clear();
 473         }
 474
 475         setDefaultConfigurationForCompressors();
 476
 477         compressors.push_back(Compressor(".", "", "", "", "", 1));
 478         if (_config->Exists("Dir::Bin::gzip") == false || FileExists(_config->FindFile("Dir::Bin::gzip")) == true)
 479                 compressors.push_back(Compressor("gzip",".gz","gzip","-9n","-d",2));
 480 #ifdef HAVE_ZLIB
 481         else
 482                 compressors.push_back(Compressor("gzip",".gz","/bin/false", "", "", 2));
 483 #endif
 484         if (_config->Exists("Dir::Bin::bzip2") == false || FileExists(_config->FindFile("Dir::Bin::bzip2")) == true)
 485                 compressors.push_back(Compressor("bzip2",".bz2","bzip2","-9","-d",3));
 486         if (_config->Exists("Dir::Bin::xz") == false || FileExists(_config->FindFile("Dir::Bin::xz")) == true)
 487                 compressors.push_back(Compressor("xz",".xz","xz","-6","-d",4));
 488         if (_config->Exists("Dir::Bin::lzma") == false || FileExists(_config->FindFile("Dir::Bin::lzma")) == true)
 489                 compressors.push_back(Compressor("lzma",".lzma","lzma","-9","-d",5));
 490
 491         std::vector<std::string> const comp = _config->FindVector("APT::Compressor");
 492         for (std::vector<std::string>::const_iterator c = comp.begin();
 493              c != comp.end(); ++c) {
 494                 if (*c == "." || *c == "gzip" || *c == "bzip2" || *c == "lzma" || *c == "xz")
 495                         continue;
 496                 compressors.push_back(Compressor(c->c_str(), std::string(".").append(*c).c_str(), c->c_str(), "-9", "-d", 100));
 497         }
 498
 499         return compressors;
 500 }
 501                                                                         /*}}}*/
 502 // getCompressorExtensions - supported data.tar extensions              /*{{{*/
 503 // ---------------------------------------------------------------------
 504 /* */
 505 std::vector<std::string> const Configuration::getCompressorExtensions() {
 506         std::vector<APT::Configuration::Compressor> const compressors = getCompressors();
 507         std::vector<std::string> ext;
 508         for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressors.begin();
 509              c != compressors.end(); ++c)
 510                 if (c->Extension.empty() == false && c->Extension != ".")
 511                         ext.push_back(c->Extension);
 512         return ext;
 513 }
 514                                                                         /*}}}*/
 515 // Compressor constructor                                               /*{{{*/
 516 // ---------------------------------------------------------------------
 517 /* */
 518 Configuration::Compressor::Compressor(char const *name, char const *extension,
 519                                       char const *binary,
 520                                       char const *compressArg, char const *uncompressArg,
 521                                       unsigned short const cost) {
 522         std::string const config = std::string("APT::Compressor::").append(name).append("::");
 523         Name = _config->Find(std::string(config).append("Name"), name);
 524         Extension = _config->Find(std::string(config).append("Extension"), extension);
 525         Binary = _config->Find(std::string(config).append("Binary"), binary);
 526         Cost = _config->FindI(std::string(config).append("Cost"), cost);
 527         std::string const compConf = std::string(config).append("CompressArg");
 528         if (_config->Exists(compConf) == true)
 529                 CompressArgs = _config->FindVector(compConf);
 530         else if (compressArg != NULL)
 531                 CompressArgs.push_back(compressArg);
 532         std::string const uncompConf = std::string(config).append("UncompressArg");
 533         if (_config->Exists(uncompConf) == true)
 534                 UncompressArgs = _config->FindVector(uncompConf);
 535         else if (uncompressArg != NULL)
 536                 UncompressArgs.push_back(uncompressArg);
 537 }
 538                                                                         /*}}}*/
 539 }