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
  21 #include <algorithm>
  22 #include <string>
  23 #include <vector>
  24                                                                         /*}}}*/
  25 namespace APT {
  26 // getCompressionTypes - Return Vector of usbale compressiontypes       /*{{{*/
  27 // ---------------------------------------------------------------------
  28 /* return a vector of compression types in the prefered order. */
  29 std::vector<std::string>
  30 const Configuration::getCompressionTypes(bool const &Cached) {
  31         static std::vector<std::string> types;
  32         if (types.empty() == false) {
  33                 if (Cached == true)
  34                         return types;
  35                 else
  36                         types.clear();
  37         }
  38
  39         // setup the defaults for the compressiontypes => method mapping
  40         _config->CndSet("Acquire::CompressionTypes::bz2","bzip2");
  41         _config->CndSet("Acquire::CompressionTypes::lzma","lzma");
  42         _config->CndSet("Acquire::CompressionTypes::gz","gzip");
  43
  44         // Set default application paths to check for optional compression types
  45         _config->CndSet("Dir::Bin::lzma", "/usr/bin/lzma");
  46         _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
  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("_");
 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)
 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::Translation=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                 allCodes = codes;
 236                 for (std::vector<string>::const_iterator b = builtin.begin();
 237                      b != builtin.end(); ++b)
 238                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 239                                 allCodes.push_back(*b);
 240                 if (All == true)
 241                         return allCodes;
 242                 else
 243                         return codes;
 244         }
 245
 246         // cornercase: LANG=C, so we use only "en" Translation
 247         if (envShort == "C") {
 248                 allCodes = codes = environment;
 249                 allCodes.insert(allCodes.end(), builtin.begin(), builtin.end());
 250                 if (All == true)
 251                         return allCodes;
 252                 else
 253                         return codes;
 254         }
 255
 256         std::vector<string> const lang = _config->FindVector("Acquire::Languages");
 257         // the default setting -> "environment, en"
 258         if (lang.empty() == true) {
 259                 codes = environment;
 260                 if (envShort != "en")
 261                         codes.push_back("en");
 262                 allCodes = codes;
 263                 for (std::vector<string>::const_iterator b = builtin.begin();
 264                      b != builtin.end(); ++b)
 265                         if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 266                                 allCodes.push_back(*b);
 267                 if (All == true)
 268                         return allCodes;
 269                 else
 270                         return codes;
 271         }
 272
 273         // the configs define the order, so add the environment
 274         // then needed and ensure the codes are not listed twice.
 275         bool noneSeen = false;
 276         for (std::vector<string>::const_iterator l = lang.begin();
 277              l != lang.end(); l++) {
 278                 if (*l == "environment") {
 279                         for (std::vector<string>::const_iterator e = environment.begin();
 280                              e != environment.end(); ++e) {
 281                                 if (std::find(allCodes.begin(), allCodes.end(), *e) != allCodes.end())
 282                                         continue;
 283                                 if (noneSeen == false)
 284                                         codes.push_back(*e);
 285                                 allCodes.push_back(*e);
 286                         }
 287                         continue;
 288                 } else if (*l == "none") {
 289                         noneSeen = true;
 290                         continue;
 291                 } else if (std::find(allCodes.begin(), allCodes.end(), *l) != allCodes.end())
 292                         continue;
 293
 294                 if (noneSeen == false)
 295                         codes.push_back(*l);
 296                 allCodes.push_back(*l);
 297         }
 298
 299         for (std::vector<string>::const_iterator b = builtin.begin();
 300              b != builtin.end(); ++b)
 301                 if (std::find(allCodes.begin(), allCodes.end(), *b) == allCodes.end())
 302                         allCodes.push_back(*b);
 303
 304         if (All == true)
 305                 return allCodes;
 306         else
 307                 return codes;
 308 }
 309                                                                         /*}}}*/
 310 // getArchitectures - Return Vector of prefered Architectures           /*{{{*/
 311 std::vector<std::string> const Configuration::getArchitectures(bool const &Cached) {
 312         using std::string;
 313
 314         std::vector<string> static archs;
 315         if (likely(Cached == true) && archs.empty() == false)
 316                 return archs;
 317
 318         archs = _config->FindVector("APT::Architectures");
 319         string const arch = _config->Find("APT::Architecture");
 320         if (unlikely(arch.empty() == true))
 321                 return archs;
 322
 323         if (archs.empty() == true ||
 324             std::find(archs.begin(), archs.end(), arch) == archs.end())
 325                 archs.push_back(arch);
 326
 327         // erase duplicates and empty strings
 328         for (std::vector<string>::reverse_iterator a = archs.rbegin();
 329              a != archs.rend(); ++a) {
 330                 if (a->empty() == true || std::find(a + 1, archs.rend(), *a) != archs.rend())
 331                         archs.erase(a.base()-1);
 332                 if (a == archs.rend())
 333                         break;
 334         }
 335
 336         return archs;
 337 }
 338                                                                         /*}}}*/
 339 // checkArchitecture - are we interested in the given Architecture?     /*{{{*/
 340 bool const Configuration::checkArchitecture(std::string const &Arch) {
 341         if (Arch == "all")
 342                 return true;
 343         std::vector<std::string> const archs = getArchitectures(true);
 344         return (std::find(archs.begin(), archs.end(), Arch) != archs.end());
 345 }
 346                                                                         /*}}}*/
 347 }