apt-pkg/cacheset.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Simple wrapper around a std::set to provide a similar interface to
   6    a set of cache structures as to the complete set of all structures
   7    in the pkgCache. Currently only Package is supported.
   8
   9    ##################################################################### */
  10                                                                         /*}}}*/
  11 // Include Files                                                        /*{{{*/
  12 #include <config.h>
  13
  14 #include <apt-pkg/aptconfiguration.h>
  15 #include <apt-pkg/cachefile.h>
  16 #include <apt-pkg/cachefilter.h>
  17 #include <apt-pkg/cacheset.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/strutl.h>
  20 #include <apt-pkg/versionmatch.h>
  21 #include <apt-pkg/pkgrecords.h>
  22 #include <apt-pkg/policy.h>
  23
  24 #include <vector>
  25
  26 #include <regex.h>
  27
  28 #include <apti18n.h>
  29                                                                         /*}}}*/
  30 namespace APT {
  31 // FromTask - Return all packages in the cache from a specific task     /*{{{*/
  32 bool PackageContainerInterface::FromTask(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string pattern, CacheSetHelper &helper) {
  33         size_t const archfound = pattern.find_last_of(':');
  34         std::string arch = "native";
  35         if (archfound != std::string::npos) {
  36                 arch = pattern.substr(archfound+1);
  37                 pattern.erase(archfound);
  38         }
  39
  40         if (pattern[pattern.length() -1] != '^')
  41                 return false;
  42         pattern.erase(pattern.length()-1);
  43
  44         if (unlikely(Cache.GetPkgCache() == 0 || Cache.GetDepCache() == 0))
  45                 return false;
  46
  47         bool const wasEmpty = pci->empty();
  48         if (wasEmpty == true)
  49                 pci->setConstructor(TASK);
  50
  51         // get the records
  52         pkgRecords Recs(Cache);
  53
  54         // build regexp for the task
  55         regex_t Pattern;
  56         char S[300];
  57         snprintf(S, sizeof(S), "^Task:.*[, ]%s([, ]|$)", pattern.c_str());
  58         if(regcomp(&Pattern,S, REG_EXTENDED | REG_NOSUB | REG_NEWLINE) != 0) {
  59                 _error->Error("Failed to compile task regexp");
  60                 return false;
  61         }
  62
  63         bool found = false;
  64         for (pkgCache::GrpIterator Grp = Cache->GrpBegin(); Grp.end() == false; ++Grp) {
  65                 pkgCache::PkgIterator Pkg = Grp.FindPkg(arch);
  66                 if (Pkg.end() == true)
  67                         continue;
  68                 pkgCache::VerIterator ver = Cache[Pkg].CandidateVerIter(Cache);
  69                 if(ver.end() == true)
  70                         continue;
  71
  72                 pkgRecords::Parser &parser = Recs.Lookup(ver.FileList());
  73                 const char *start, *end;
  74                 parser.GetRec(start,end);
  75                 unsigned int const length = end - start;
  76                 char buf[length];
  77                 strncpy(buf, start, length);
  78                 buf[length-1] = '\0';
  79                 if (regexec(&Pattern, buf, 0, 0, 0) != 0)
  80                         continue;
  81
  82                 pci->insert(Pkg);
  83                 helper.showTaskSelection(Pkg, pattern);
  84                 found = true;
  85         }
  86         regfree(&Pattern);
  87
  88         if (found == false) {
  89                 helper.canNotFindTask(pci, Cache, pattern);
  90                 pci->setConstructor(UNKNOWN);
  91                 return false;
  92         }
  93
  94         if (wasEmpty == false && pci->getConstructor() != UNKNOWN)
  95                 pci->setConstructor(UNKNOWN);
  96
  97         return true;
  98 }
  99                                                                         /*}}}*/
 100 // FromRegEx - Return all packages in the cache matching a pattern      /*{{{*/
 101 bool PackageContainerInterface::FromRegEx(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string pattern, CacheSetHelper &helper) {
 102         static const char * const isregex = ".?+*|[^$";
 103         if (pattern.find_first_of(isregex) == std::string::npos)
 104                 return false;
 105
 106         bool const wasEmpty = pci->empty();
 107         if (wasEmpty == true)
 108                 pci->setConstructor(REGEX);
 109
 110         size_t archfound = pattern.find_last_of(':');
 111         std::string arch = "native";
 112         if (archfound != std::string::npos) {
 113                 arch = pattern.substr(archfound+1);
 114                 if (arch.find_first_of(isregex) == std::string::npos)
 115                         pattern.erase(archfound);
 116                 else
 117                         arch = "native";
 118         }
 119
 120         if (unlikely(Cache.GetPkgCache() == 0))
 121                 return false;
 122
 123         APT::CacheFilter::PackageNameMatchesRegEx regexfilter(pattern);
 124
 125         bool found = false;
 126         for (pkgCache::GrpIterator Grp = Cache.GetPkgCache()->GrpBegin(); Grp.end() == false; ++Grp) {
 127                 if (regexfilter(Grp) == false)
 128                         continue;
 129                 pkgCache::PkgIterator Pkg = Grp.FindPkg(arch);
 130                 if (Pkg.end() == true) {
 131                         if (archfound == std::string::npos) {
 132                                 std::vector<std::string> archs = APT::Configuration::getArchitectures();
 133                                 for (std::vector<std::string>::const_iterator a = archs.begin();
 134                                      a != archs.end() && Pkg.end() != true; ++a)
 135                                         Pkg = Grp.FindPkg(*a);
 136                         }
 137                         if (Pkg.end() == true)
 138                                 continue;
 139                 }
 140
 141                 pci->insert(Pkg);
 142                 helper.showRegExSelection(Pkg, pattern);
 143                 found = true;
 144         }
 145
 146         if (found == false) {
 147                 helper.canNotFindRegEx(pci, Cache, pattern);
 148                 pci->setConstructor(UNKNOWN);
 149                 return false;
 150         }
 151
 152         if (wasEmpty == false && pci->getConstructor() != UNKNOWN)
 153                 pci->setConstructor(UNKNOWN);
 154
 155         return true;
 156 }
 157                                                                         /*}}}*/
 158 // FromName - Returns the package defined  by this string               /*{{{*/
 159 pkgCache::PkgIterator PackageContainerInterface::FromName(pkgCacheFile &Cache,
 160                         std::string const &str, CacheSetHelper &helper) {
 161         std::string pkg = str;
 162         size_t archfound = pkg.find_last_of(':');
 163         std::string arch;
 164         if (archfound != std::string::npos) {
 165                 arch = pkg.substr(archfound+1);
 166                 pkg.erase(archfound);
 167         }
 168
 169         if (Cache.GetPkgCache() == 0)
 170                 return pkgCache::PkgIterator(Cache, 0);
 171
 172         pkgCache::PkgIterator Pkg(Cache, 0);
 173         if (arch.empty() == true) {
 174                 pkgCache::GrpIterator Grp = Cache.GetPkgCache()->FindGrp(pkg);
 175                 if (Grp.end() == false)
 176                         Pkg = Grp.FindPreferredPkg();
 177         } else
 178                 Pkg = Cache.GetPkgCache()->FindPkg(pkg, arch);
 179
 180         if (Pkg.end() == true)
 181                 return helper.canNotFindPkgName(Cache, str);
 182         return Pkg;
 183 }
 184                                                                         /*}}}*/
 185 // FromGroup - Returns the package defined  by this string              /*{{{*/
 186 bool PackageContainerInterface::FromGroup(PackageContainerInterface * const pci, pkgCacheFile &Cache,
 187                         std::string pkg, CacheSetHelper &helper) {
 188         if (unlikely(Cache.GetPkgCache() == 0))
 189                 return false;
 190
 191         size_t const archfound = pkg.find_last_of(':');
 192         std::string arch;
 193         if (archfound != std::string::npos) {
 194                 arch = pkg.substr(archfound+1);
 195                 pkg.erase(archfound);
 196                 if (arch == "all" || arch == "native")
 197                         arch = _config->Find("APT::Architecture");
 198         }
 199
 200         pkgCache::GrpIterator Grp = Cache.GetPkgCache()->FindGrp(pkg);
 201         if (Grp.end() == false) {
 202                 if (arch.empty() == true) {
 203                         pkgCache::PkgIterator Pkg = Grp.FindPreferredPkg();
 204                         if (Pkg.end() == false)
 205                         {
 206                            pci->insert(Pkg);
 207                            return true;
 208                         }
 209                 } else {
 210                         bool found = false;
 211                         // for 'linux-any' return the first package matching, for 'linux-*' return all matches
 212                         bool const isGlobal = arch.find('*') != std::string::npos;
 213                         APT::CacheFilter::PackageArchitectureMatchesSpecification pams(arch);
 214                         for (pkgCache::PkgIterator Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg)) {
 215                                 if (pams(Pkg) == false)
 216                                         continue;
 217                                 pci->insert(Pkg);
 218                                 found = true;
 219                                 if (isGlobal == false)
 220                                         break;
 221                         }
 222                         if (found == true)
 223                                 return true;
 224                 }
 225         }
 226
 227         pkgCache::PkgIterator Pkg = helper.canNotFindPkgName(Cache, pkg);
 228         if (Pkg.end() == true)
 229            return false;
 230
 231         pci->insert(Pkg);
 232         return true;
 233 }
 234                                                                         /*}}}*/
 235 // FromString - Return all packages matching a specific string          /*{{{*/
 236 bool PackageContainerInterface::FromString(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string const &str, CacheSetHelper &helper) {
 237         bool found = true;
 238         _error->PushToStack();
 239
 240         if (FromGroup(pci, Cache, str, helper) == false &&
 241                  FromTask(pci, Cache, str, helper) == false &&
 242                  FromRegEx(pci, Cache, str, helper) == false)
 243         {
 244                 helper.canNotFindPackage(pci, Cache, str);
 245                 found = false;
 246         }
 247
 248         if (found == true)
 249                 _error->RevertToStack();
 250         else
 251                 _error->MergeWithStack();
 252         return found;
 253 }
 254                                                                         /*}}}*/
 255 // FromCommandLine - Return all packages specified on commandline       /*{{{*/
 256 bool PackageContainerInterface::FromCommandLine(PackageContainerInterface * const pci, pkgCacheFile &Cache, const char **cmdline, CacheSetHelper &helper) {
 257         bool found = false;
 258         for (const char **I = cmdline; *I != 0; ++I)
 259                 found |= PackageContainerInterface::FromString(pci, Cache, *I, helper);
 260         return found;
 261 }
 262                                                                         /*}}}*/
 263 // FromModifierCommandLine - helper doing the work for PKG:GroupedFromCommandLine       /*{{{*/
 264 bool PackageContainerInterface::FromModifierCommandLine(unsigned short &modID, PackageContainerInterface * const pci,
 265                                                         pkgCacheFile &Cache, const char * cmdline,
 266                                                         std::list<Modifier> const &mods, CacheSetHelper &helper) {
 267         std::string str = cmdline;
 268         unsigned short fallback = modID;
 269         bool modifierPresent = false;
 270         for (std::list<Modifier>::const_iterator mod = mods.begin();
 271              mod != mods.end(); ++mod) {
 272                 size_t const alength = strlen(mod->Alias);
 273                 switch(mod->Pos) {
 274                 case Modifier::POSTFIX:
 275                         if (str.compare(str.length() - alength, alength,
 276                                         mod->Alias, 0, alength) != 0)
 277                                 continue;
 278                         str.erase(str.length() - alength);
 279                         modID = mod->ID;
 280                         break;
 281                 case Modifier::PREFIX:
 282                         continue;
 283                 case Modifier::NONE:
 284                         continue;
 285                 }
 286                 modifierPresent = true;
 287                 break;
 288         }
 289         if (modifierPresent == true) {
 290                 bool const errors = helper.showErrors(false);
 291                 pkgCache::PkgIterator Pkg = FromName(Cache, cmdline, helper);
 292                 helper.showErrors(errors);
 293                 if (Pkg.end() == false) {
 294                         pci->insert(Pkg);
 295                         modID = fallback;
 296                         return true;
 297                 }
 298         }
 299         return FromString(pci, Cache, str, helper);
 300 }
 301                                                                         /*}}}*/
 302 // FromModifierCommandLine - helper doing the work for VER:GroupedFromCommandLine       /*{{{*/
 303 bool VersionContainerInterface::FromModifierCommandLine(unsigned short &modID,
 304                                                         VersionContainerInterface * const vci,
 305                                                         pkgCacheFile &Cache, const char * cmdline,
 306                                                         std::list<Modifier> const &mods,
 307                                                         CacheSetHelper &helper) {
 308         Version select = NEWEST;
 309         std::string str = cmdline;
 310         bool modifierPresent = false;
 311         unsigned short fallback = modID;
 312         for (std::list<Modifier>::const_iterator mod = mods.begin();
 313              mod != mods.end(); ++mod) {
 314                 if (modID == fallback && mod->ID == fallback)
 315                         select = mod->SelectVersion;
 316                 size_t const alength = strlen(mod->Alias);
 317                 switch(mod->Pos) {
 318                 case Modifier::POSTFIX:
 319                         if (str.compare(str.length() - alength, alength,
 320                                         mod->Alias, 0, alength) != 0)
 321                                 continue;
 322                         str.erase(str.length() - alength);
 323                         modID = mod->ID;
 324                         select = mod->SelectVersion;
 325                         break;
 326                 case Modifier::PREFIX:
 327                         continue;
 328                 case Modifier::NONE:
 329                         continue;
 330                 }
 331                 modifierPresent = true;
 332                 break;
 333         }
 334         if (modifierPresent == true) {
 335                 bool const errors = helper.showErrors(false);
 336                 bool const found = VersionContainerInterface::FromString(vci, Cache, cmdline, select, helper, true);
 337                 helper.showErrors(errors);
 338                 if (found == true) {
 339                         modID = fallback;
 340                         return true;
 341                 }
 342         }
 343         return FromString(vci, Cache, str, select, helper);
 344 }
 345                                                                         /*}}}*/
 346 // FromCommandLine - Return all versions specified on commandline       /*{{{*/
 347 bool VersionContainerInterface::FromCommandLine(VersionContainerInterface * const vci,
 348                                                 pkgCacheFile &Cache, const char **cmdline,
 349                                                 Version const &fallback, CacheSetHelper &helper) {
 350         bool found = false;
 351         for (const char **I = cmdline; *I != 0; ++I)
 352                 found |= VersionContainerInterface::FromString(vci, Cache, *I, fallback, helper);
 353         return found;
 354 }
 355                                                                         /*}}}*/
 356 // FromString - Returns all versions spedcified by a string             /*{{{*/
 357 bool VersionContainerInterface::FromString(VersionContainerInterface * const vci,
 358                                            pkgCacheFile &Cache, std::string pkg,
 359                                            Version const &fallback, CacheSetHelper &helper,
 360                                            bool const onlyFromName) {
 361         std::string ver;
 362         bool verIsRel = false;
 363         size_t const vertag = pkg.find_last_of("/=");
 364         if (vertag != std::string::npos) {
 365                 ver = pkg.substr(vertag+1);
 366                 verIsRel = (pkg[vertag] == '/');
 367                 pkg.erase(vertag);
 368         }
 369         PackageSet pkgset;
 370         if (onlyFromName == false)
 371                 PackageContainerInterface::FromString(&pkgset, Cache, pkg, helper);
 372         else {
 373                 pkgset.insert(PackageContainerInterface::FromName(Cache, pkg, helper));
 374         }
 375
 376         bool errors = true;
 377         if (pkgset.getConstructor() != PackageSet::UNKNOWN)
 378                 errors = helper.showErrors(false);
 379
 380         bool found = false;
 381         for (PackageSet::const_iterator P = pkgset.begin();
 382              P != pkgset.end(); ++P) {
 383                 if (vertag == std::string::npos) {
 384                         found |= VersionContainerInterface::FromPackage(vci, Cache, P, fallback, helper);
 385                         continue;
 386                 }
 387                 pkgCache::VerIterator V;
 388                 if (ver == "installed")
 389                         V = getInstalledVer(Cache, P, helper);
 390                 else if (ver == "candidate")
 391                         V = getCandidateVer(Cache, P, helper);
 392                 else if (ver == "newest") {
 393                         if (P->VersionList != 0)
 394                                 V = P.VersionList();
 395                         else
 396                                 V = helper.canNotFindNewestVer(Cache, P);
 397                 } else {
 398                         pkgVersionMatch Match(ver, (verIsRel == true ? pkgVersionMatch::Release :
 399                                         pkgVersionMatch::Version));
 400                         V = Match.Find(P);
 401                         if (V.end() == true) {
 402                                 if (verIsRel == true)
 403                                         _error->Error(_("Release '%s' for '%s' was not found"),
 404                                                         ver.c_str(), P.FullName(true).c_str());
 405                                 else
 406                                         _error->Error(_("Version '%s' for '%s' was not found"),
 407                                                         ver.c_str(), P.FullName(true).c_str());
 408                                 continue;
 409                         }
 410                 }
 411                 if (V.end() == true)
 412                         continue;
 413                 helper.showSelectedVersion(P, V, ver, verIsRel);
 414                 vci->insert(V);
 415                 found = true;
 416         }
 417         if (pkgset.getConstructor() != PackageSet::UNKNOWN)
 418                 helper.showErrors(errors);
 419         return found;
 420 }
 421                                                                         /*}}}*/
 422 // FromPackage - versions from package based on fallback                /*{{{*/
 423 bool VersionContainerInterface::FromPackage(VersionContainerInterface * const vci,
 424                                             pkgCacheFile &Cache,
 425                                             pkgCache::PkgIterator const &P,
 426                                             Version const &fallback,
 427                                             CacheSetHelper &helper) {
 428         pkgCache::VerIterator V;
 429         bool showErrors;
 430         bool found = false;
 431         switch(fallback) {
 432         case ALL:
 433                 if (P->VersionList != 0)
 434                         for (V = P.VersionList(); V.end() != true; ++V)
 435                                 found |= vci->insert(V);
 436                 else
 437                         helper.canNotFindAllVer(vci, Cache, P);
 438                 break;
 439         case CANDANDINST:
 440                 found |= vci->insert(getInstalledVer(Cache, P, helper));
 441                 found |= vci->insert(getCandidateVer(Cache, P, helper));
 442                 break;
 443         case CANDIDATE:
 444                 found |= vci->insert(getCandidateVer(Cache, P, helper));
 445                 break;
 446         case INSTALLED:
 447                 found |= vci->insert(getInstalledVer(Cache, P, helper));
 448                 break;
 449         case CANDINST:
 450                 showErrors = helper.showErrors(false);
 451                 V = getCandidateVer(Cache, P, helper);
 452                 if (V.end() == true)
 453                         V = getInstalledVer(Cache, P, helper);
 454                 helper.showErrors(showErrors);
 455                 if (V.end() == false)
 456                         found |= vci->insert(V);
 457                 else
 458                         helper.canNotFindInstCandVer(vci, Cache, P);
 459                 break;
 460         case INSTCAND:
 461                 showErrors = helper.showErrors(false);
 462                 V = getInstalledVer(Cache, P, helper);
 463                 if (V.end() == true)
 464                         V = getCandidateVer(Cache, P, helper);
 465                 helper.showErrors(showErrors);
 466                 if (V.end() == false)
 467                         found |= vci->insert(V);
 468                 else
 469                         helper.canNotFindInstCandVer(vci, Cache, P);
 470                 break;
 471         case NEWEST:
 472                 if (P->VersionList != 0)
 473                         found |= vci->insert(P.VersionList());
 474                 else
 475                         helper.canNotFindNewestVer(Cache, P);
 476                 break;
 477         }
 478         return found;
 479 }
 480                                                                         /*}}}*/
 481 // getCandidateVer - Returns the candidate version of the given package /*{{{*/
 482 pkgCache::VerIterator VersionContainerInterface::getCandidateVer(pkgCacheFile &Cache,
 483                 pkgCache::PkgIterator const &Pkg, CacheSetHelper &helper) {
 484         pkgCache::VerIterator Cand;
 485         if (Cache.IsPolicyBuilt() == true || Cache.IsDepCacheBuilt() == false) {
 486                 if (unlikely(Cache.GetPolicy() == 0))
 487                         return pkgCache::VerIterator(Cache);
 488                 Cand = Cache.GetPolicy()->GetCandidateVer(Pkg);
 489         } else {
 490                 Cand = Cache[Pkg].CandidateVerIter(Cache);
 491         }
 492         if (Cand.end() == true)
 493                 return helper.canNotFindCandidateVer(Cache, Pkg);
 494         return Cand;
 495 }
 496                                                                         /*}}}*/
 497 // getInstalledVer - Returns the installed version of the given package /*{{{*/
 498 pkgCache::VerIterator VersionContainerInterface::getInstalledVer(pkgCacheFile &Cache,
 499                 pkgCache::PkgIterator const &Pkg, CacheSetHelper &helper) {
 500         if (Pkg->CurrentVer == 0)
 501                 return helper.canNotFindInstalledVer(Cache, Pkg);
 502         return Pkg.CurrentVer();
 503 }
 504                                                                         /*}}}*/
 505
 506 // canNotFindPkgName - handle the case no package has this name         /*{{{*/
 507 pkgCache::PkgIterator CacheSetHelper::canNotFindPkgName(pkgCacheFile &Cache,
 508                         std::string const &str) {
 509         if (ShowError == true)
 510                 _error->Insert(ErrorType, _("Unable to locate package %s"), str.c_str());
 511         return pkgCache::PkgIterator(Cache, 0);
 512 }
 513                                                                         /*}}}*/
 514 // canNotFindTask - handle the case no package is found for a task      /*{{{*/
 515 void CacheSetHelper::canNotFindTask(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string pattern) {
 516         if (ShowError == true)
 517                 _error->Insert(ErrorType, _("Couldn't find task '%s'"), pattern.c_str());
 518 }
 519                                                                         /*}}}*/
 520 // canNotFindRegEx - handle the case no package is found by a regex     /*{{{*/
 521 void CacheSetHelper::canNotFindRegEx(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string pattern) {
 522         if (ShowError == true)
 523                 _error->Insert(ErrorType, _("Couldn't find any package by regex '%s'"), pattern.c_str());
 524 }
 525                                                                         /*}}}*/
 526 // canNotFindPackage - handle the case no package is found from a string/*{{{*/
 527 void CacheSetHelper::canNotFindPackage(PackageContainerInterface * const pci, pkgCacheFile &Cache, std::string const &str) {
 528 }
 529                                                                         /*}}}*/
 530 // canNotFindAllVer                                                     /*{{{*/
 531 void CacheSetHelper::canNotFindAllVer(VersionContainerInterface * const vci, pkgCacheFile &Cache,
 532                 pkgCache::PkgIterator const &Pkg) {
 533         if (ShowError == true)
 534                 _error->Insert(ErrorType, _("Can't select versions from package '%s' as it is purely virtual"), Pkg.FullName(true).c_str());
 535 }
 536                                                                         /*}}}*/
 537 // canNotFindInstCandVer                                                /*{{{*/
 538 void CacheSetHelper::canNotFindInstCandVer(VersionContainerInterface * const vci, pkgCacheFile &Cache,
 539                 pkgCache::PkgIterator const &Pkg) {
 540         if (ShowError == true)
 541                 _error->Insert(ErrorType, _("Can't select installed nor candidate version from package '%s' as it has neither of them"), Pkg.FullName(true).c_str());
 542 }
 543                                                                         /*}}}*/
 544 // canNotFindInstCandVer                                                /*{{{*/
 545 void CacheSetHelper::canNotFindCandInstVer(VersionContainerInterface * const vci, pkgCacheFile &Cache,
 546                 pkgCache::PkgIterator const &Pkg) {
 547         if (ShowError == true)
 548                 _error->Insert(ErrorType, _("Can't select installed nor candidate version from package '%s' as it has neither of them"), Pkg.FullName(true).c_str());
 549 }
 550                                                                         /*}}}*/
 551 // canNotFindNewestVer                                                  /*{{{*/
 552 pkgCache::VerIterator CacheSetHelper::canNotFindNewestVer(pkgCacheFile &Cache,
 553                 pkgCache::PkgIterator const &Pkg) {
 554         if (ShowError == true)
 555                 _error->Insert(ErrorType, _("Can't select newest version from package '%s' as it is purely virtual"), Pkg.FullName(true).c_str());
 556         return pkgCache::VerIterator(Cache, 0);
 557 }
 558                                                                         /*}}}*/
 559 // canNotFindCandidateVer                                               /*{{{*/
 560 pkgCache::VerIterator CacheSetHelper::canNotFindCandidateVer(pkgCacheFile &Cache,
 561                 pkgCache::PkgIterator const &Pkg) {
 562         if (ShowError == true)
 563                 _error->Insert(ErrorType, _("Can't select candidate version from package %s as it has no candidate"), Pkg.FullName(true).c_str());
 564         return pkgCache::VerIterator(Cache, 0);
 565 }
 566                                                                         /*}}}*/
 567 // canNotFindInstalledVer                                               /*{{{*/
 568 pkgCache::VerIterator CacheSetHelper::canNotFindInstalledVer(pkgCacheFile &Cache,
 569                 pkgCache::PkgIterator const &Pkg) {
 570         if (ShowError == true)
 571                 _error->Insert(ErrorType, _("Can't select installed version from package %s as it is not installed"), Pkg.FullName(true).c_str());
 572         return pkgCache::VerIterator(Cache, 0);
 573 }
 574                                                                         /*}}}*/
 575 // showTaskSelection                                                    /*{{{*/
 576 void CacheSetHelper::showTaskSelection(pkgCache::PkgIterator const &pkg,
 577                                        std::string const &pattern) {
 578 }
 579                                                                         /*}}}*/
 580 // showRegExSelection                                                   /*{{{*/
 581 void CacheSetHelper::showRegExSelection(pkgCache::PkgIterator const &pkg,
 582                                         std::string const &pattern) {
 583 }
 584                                                                         /*}}}*/
 585 // showSelectedVersion                                                  /*{{{*/
 586 void CacheSetHelper::showSelectedVersion(pkgCache::PkgIterator const &Pkg,
 587                                          pkgCache::VerIterator const Ver,
 588                                          std::string const &ver,
 589                                          bool const verIsRel) {
 590 }
 591                                                                         /*}}}*/
 592 }