apt-pkg/depcache.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: depcache.cc,v 1.25 2001/05/27 05:36:04 jgg Exp $
   4 /* ######################################################################
   5
   6    Dependency Cache - Caches Dependency information.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include<config.h>
  12
  13 #include <apt-pkg/depcache.h>
  14 #include <apt-pkg/version.h>
  15 #include <apt-pkg/versionmatch.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/sptr.h>
  18 #include <apt-pkg/algorithms.h>
  19 #include <apt-pkg/fileutl.h>
  20 #include <apt-pkg/strutl.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/aptconfiguration.h>
  23 #include <apt-pkg/pkgsystem.h>
  24 #include <apt-pkg/tagfile.h>
  25 #include <apt-pkg/progress.h>
  26 #include <apt-pkg/cacheset.h>
  27
  28 #include <algorithm>
  29 #include <iostream>
  30 #include <sstream>
  31 #include <set>
  32
  33 #include <sys/stat.h>
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37
  38 using std::string;
  39
  40 // helper for Install-Recommends-Sections and Never-MarkAuto-Sections   /*{{{*/
  41 static bool
  42 ConfigValueInSubTree(const char* SubTree, const char *needle)
  43 {
  44    Configuration::Item const *Opts;
  45    Opts = _config->Tree(SubTree);
  46    if (Opts != 0 && Opts->Child != 0)
  47    {
  48       Opts = Opts->Child;
  49       for (; Opts != 0; Opts = Opts->Next)
  50       {
  51          if (Opts->Value.empty() == true)
  52             continue;
  53          if (strcmp(needle, Opts->Value.c_str()) == 0)
  54             return true;
  55       }
  56    }
  57    return false;
  58 }
  59                                                                         /*}}}*/
  60 pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :             /*{{{*/
  61   cache(cache), released(false)
  62 {
  63   ++cache.group_level;
  64 }
  65
  66 void pkgDepCache::ActionGroup::release()
  67 {
  68   if(!released)
  69     {
  70       if(cache.group_level == 0)
  71         std::cerr << "W: Unbalanced action groups, expect badness" << std::endl;
  72       else
  73         {
  74           --cache.group_level;
  75
  76           if(cache.group_level == 0)
  77             cache.MarkAndSweep();
  78         }
  79
  80       released = true;
  81     }
  82 }
  83
  84 pkgDepCache::ActionGroup::~ActionGroup()
  85 {
  86   release();
  87 }
  88                                                                         /*}}}*/
  89 // DepCache::pkgDepCache - Constructors                                 /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 pkgDepCache::pkgDepCache(pkgCache *pCache,Policy *Plcy) :
  93   group_level(0), Cache(pCache), PkgState(0), DepState(0)
  94 {
  95    DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
  96    DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
  97    delLocalPolicy = 0;
  98    LocalPolicy = Plcy;
  99    if (LocalPolicy == 0)
 100       delLocalPolicy = LocalPolicy = new Policy;
 101 }
 102                                                                         /*}}}*/
 103 // DepCache::~pkgDepCache - Destructor                                  /*{{{*/
 104 // ---------------------------------------------------------------------
 105 /* */
 106 pkgDepCache::~pkgDepCache()
 107 {
 108    delete [] PkgState;
 109    delete [] DepState;
 110    delete delLocalPolicy;
 111 }
 112                                                                         /*}}}*/
 113 // DepCache::Init - Generate the initial extra structures.              /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* This allocats the extension buffers and initializes them. */
 116 bool pkgDepCache::Init(OpProgress *Prog)
 117 {
 118    // Suppress mark updates during this operation (just in case) and
 119    // run a mark operation when Init terminates.
 120    ActionGroup actions(*this);
 121
 122    delete [] PkgState;
 123    delete [] DepState;
 124    PkgState = new StateCache[Head().PackageCount];
 125    DepState = new unsigned char[Head().DependsCount];
 126    memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
 127    memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
 128
 129    if (Prog != 0)
 130    {
 131       Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
 132                             _("Building dependency tree"));
 133       Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
 134    }
 135
 136    /* Set the current state of everything. In this state all of the
 137       packages are kept exactly as is. See AllUpgrade */
 138    int Done = 0;
 139    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 140    {
 141       if (Prog != 0 && Done%20 == 0)
 142          Prog->Progress(Done);
 143
 144       // Find the proper cache slot
 145       StateCache &State = PkgState[I->ID];
 146       State.iFlags = 0;
 147
 148       // Figure out the install version
 149       State.CandidateVer = GetCandidateVer(I);
 150       State.InstallVer = I.CurrentVer();
 151       State.Mode = ModeKeep;
 152
 153       State.Update(I,*this);
 154    }
 155
 156    if (Prog != 0)
 157    {
 158
 159       Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
 160                             Head().PackageCount,
 161                             _("Building dependency tree"));
 162       Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
 163    }
 164
 165    Update(Prog);
 166
 167    if(Prog != 0)
 168       Prog->Done();
 169
 170    return true;
 171 }
 172                                                                         /*}}}*/
 173 bool pkgDepCache::readStateFile(OpProgress *Prog)                       /*{{{*/
 174 {
 175    FileFd state_file;
 176    string const state = _config->FindFile("Dir::State::extended_states");
 177    if(RealFileExists(state)) {
 178       state_file.Open(state, FileFd::ReadOnly);
 179       off_t const file_size = state_file.Size();
 180       if(Prog != NULL)
 181          Prog->OverallProgress(0, file_size, 1,
 182                                _("Reading state information"));
 183
 184       pkgTagFile tagfile(&state_file);
 185       pkgTagSection section;
 186       off_t amt = 0;
 187       bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 188       while(tagfile.Step(section)) {
 189          string const pkgname = section.FindS("Package");
 190          string pkgarch = section.FindS("Architecture");
 191          if (pkgarch.empty() == true)
 192             pkgarch = "any";
 193          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 194          // Silently ignore unknown packages and packages with no actual version.
 195          if(pkg.end() == true || pkg->VersionList == 0)
 196             continue;
 197
 198          short const reason = section.FindI("Auto-Installed", 0);
 199          if(reason > 0)
 200          {
 201             PkgState[pkg->ID].Flags |= Flag::Auto;
 202             if (unlikely(debug_autoremove))
 203                std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
 204             if (pkgarch == "any")
 205             {
 206                pkgCache::GrpIterator G = pkg.Group();
 207                for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
 208                   if (pkg->VersionList != 0)
 209                      PkgState[pkg->ID].Flags |= Flag::Auto;
 210             }
 211          }
 212          amt += section.size();
 213          if(Prog != NULL)
 214             Prog->OverallProgress(amt, file_size, 1,
 215                                   _("Reading state information"));
 216       }
 217       if(Prog != NULL)
 218          Prog->OverallProgress(file_size, file_size, 1,
 219                                _("Reading state information"));
 220    }
 221
 222    return true;
 223 }
 224                                                                         /*}}}*/
 225 bool pkgDepCache::writeStateFile(OpProgress *prog, bool InstalledOnly)  /*{{{*/
 226 {
 227    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 228
 229    if(debug_autoremove)
 230       std::clog << "pkgDepCache::writeStateFile()" << std::endl;
 231
 232    FileFd StateFile;
 233    string const state = _config->FindFile("Dir::State::extended_states");
 234
 235    // if it does not exist, create a empty one
 236    if(!RealFileExists(state))
 237    {
 238       StateFile.Open(state, FileFd::WriteAtomic);
 239       StateFile.Close();
 240    }
 241
 242    // open it
 243    if(!StateFile.Open(state, FileFd::ReadOnly))
 244       return _error->Error(_("Failed to open StateFile %s"),
 245                            state.c_str());
 246
 247    FILE *OutFile;
 248    string const outfile = state + ".tmp";
 249    if((OutFile = fopen(outfile.c_str(),"w")) == NULL)
 250       return _error->Error(_("Failed to write temporary StateFile %s"),
 251                            outfile.c_str());
 252
 253    // first merge with the existing sections
 254    pkgTagFile tagfile(&StateFile);
 255    pkgTagSection section;
 256    std::set<string> pkgs_seen;
 257    const char *nullreorderlist[] = {0};
 258    while(tagfile.Step(section)) {
 259          string const pkgname = section.FindS("Package");
 260          string pkgarch = section.FindS("Architecture");
 261          if (pkgarch.empty() == true)
 262             pkgarch = "native";
 263          // Silently ignore unknown packages and packages with no actual
 264          // version.
 265          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 266          if(pkg.end() || pkg.VersionList().end())
 267             continue;
 268          StateCache const &P = PkgState[pkg->ID];
 269          bool newAuto = (P.Flags & Flag::Auto);
 270          // skip not installed or now-removed ones if requested
 271          if (InstalledOnly && (
 272              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 273              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 274          {
 275             // The section is obsolete if it contains no other tag
 276             unsigned int const count = section.Count();
 277             if (count < 2 ||
 278                 (count == 2 && section.Exists("Auto-Installed")) ||
 279                 (count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
 280                continue;
 281             else
 282                newAuto = false;
 283          }
 284          if(_config->FindB("Debug::pkgAutoRemove",false))
 285             std::clog << "Update existing AutoInstall info: "
 286                       << pkg.FullName() << std::endl;
 287          TFRewriteData rewrite[3];
 288          rewrite[0].Tag = "Architecture";
 289          rewrite[0].Rewrite = pkg.Arch();
 290          rewrite[0].NewTag = 0;
 291          rewrite[1].Tag = "Auto-Installed";
 292          rewrite[1].Rewrite = newAuto ? "1" : "0";
 293          rewrite[1].NewTag = 0;
 294          rewrite[2].Tag = 0;
 295          TFRewrite(OutFile, section, nullreorderlist, rewrite);
 296          fprintf(OutFile,"\n");
 297          pkgs_seen.insert(pkg.FullName());
 298    }
 299
 300    // then write the ones we have not seen yet
 301    std::ostringstream ostr;
 302    for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); ++pkg) {
 303       StateCache const &P = PkgState[pkg->ID];
 304       if(P.Flags & Flag::Auto) {
 305          if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
 306             if(debug_autoremove)
 307                std::clog << "Skipping already written " << pkg.FullName() << std::endl;
 308             continue;
 309          }
 310          // skip not installed ones if requested
 311          if (InstalledOnly && (
 312              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 313              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 314             continue;
 315          const char* const pkgarch = pkg.Arch();
 316          if (strcmp(pkgarch, "all") == 0)
 317             continue;
 318          if(debug_autoremove)
 319             std::clog << "Writing new AutoInstall: " << pkg.FullName() << std::endl;
 320          ostr.str(string(""));
 321          ostr << "Package: " << pkg.Name()
 322               << "\nArchitecture: " << pkgarch
 323               << "\nAuto-Installed: 1\n\n";
 324          fprintf(OutFile,"%s",ostr.str().c_str());
 325       }
 326    }
 327    fclose(OutFile);
 328
 329    // move the outfile over the real file and set permissions
 330    rename(outfile.c_str(), state.c_str());
 331    chmod(state.c_str(), 0644);
 332
 333    return true;
 334 }
 335                                                                         /*}}}*/
 336 // DepCache::CheckDep - Checks a single dependency                      /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /* This first checks the dependency against the main target package and
 339    then walks along the package provides list and checks if each provides
 340    will be installed then checks the provides against the dep. Res will be
 341    set to the package which was used to satisfy the dep. */
 342 bool pkgDepCache::CheckDep(DepIterator Dep,int Type,PkgIterator &Res)
 343 {
 344    Res = Dep.TargetPkg();
 345
 346    /* Check simple depends. A depends -should- never self match but
 347       we allow it anyhow because dpkg does. Technically it is a packaging
 348       bug. Conflicts may never self match */
 349    if (Dep.IsIgnorable(Res) == false)
 350    {
 351       PkgIterator Pkg = Dep.TargetPkg();
 352       // Check the base package
 353       if (Type == NowVersion && Pkg->CurrentVer != 0)
 354          if (Dep.IsSatisfied(Pkg.CurrentVer()) == true)
 355             return true;
 356
 357       if (Type == InstallVersion && PkgState[Pkg->ID].InstallVer != 0)
 358          if (Dep.IsSatisfied(PkgState[Pkg->ID].InstVerIter(*this)) == true)
 359             return true;
 360
 361       if (Type == CandidateVersion && PkgState[Pkg->ID].CandidateVer != 0)
 362          if (Dep.IsSatisfied(PkgState[Pkg->ID].CandidateVerIter(*this)) == true)
 363             return true;
 364    }
 365
 366    if (Dep->Type == Dep::Obsoletes)
 367       return false;
 368
 369    // Check the providing packages
 370    PrvIterator P = Dep.TargetPkg().ProvidesList();
 371    for (; P.end() != true; ++P)
 372    {
 373       if (Dep.IsIgnorable(P) == true)
 374          continue;
 375
 376       // Check if the provides is a hit
 377       if (Type == NowVersion)
 378       {
 379          if (P.OwnerPkg().CurrentVer() != P.OwnerVer())
 380             continue;
 381       }
 382
 383       if (Type == InstallVersion)
 384       {
 385          StateCache &State = PkgState[P.OwnerPkg()->ID];
 386          if (State.InstallVer != (Version *)P.OwnerVer())
 387             continue;
 388       }
 389
 390       if (Type == CandidateVersion)
 391       {
 392          StateCache &State = PkgState[P.OwnerPkg()->ID];
 393          if (State.CandidateVer != (Version *)P.OwnerVer())
 394             continue;
 395       }
 396
 397       // Compare the versions.
 398       if (Dep.IsSatisfied(P) == true)
 399       {
 400          Res = P.OwnerPkg();
 401          return true;
 402       }
 403    }
 404
 405    return false;
 406 }
 407                                                                         /*}}}*/
 408 // DepCache::AddSizes - Add the packages sizes to the counters          /*{{{*/
 409 // ---------------------------------------------------------------------
 410 /* Call with Inverse = true to preform the inverse opration */
 411 void pkgDepCache::AddSizes(const PkgIterator &Pkg, bool const Inverse)
 412 {
 413    StateCache &P = PkgState[Pkg->ID];
 414
 415    if (Pkg->VersionList == 0)
 416       return;
 417
 418    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 419        P.Keep() == true)
 420       return;
 421
 422    // Compute the size data
 423    if (P.NewInstall() == true)
 424    {
 425       if (Inverse == false) {
 426          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 427          iDownloadSize += P.InstVerIter(*this)->Size;
 428       } else {
 429          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 430          iDownloadSize -= P.InstVerIter(*this)->Size;
 431       }
 432       return;
 433    }
 434
 435    // Upgrading
 436    if (Pkg->CurrentVer != 0 &&
 437        (P.InstallVer != (Version *)Pkg.CurrentVer() ||
 438         (P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
 439    {
 440       if (Inverse == false) {
 441          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 442          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 443          iDownloadSize += P.InstVerIter(*this)->Size;
 444       } else {
 445          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 446          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 447          iDownloadSize -= P.InstVerIter(*this)->Size;
 448       }
 449       return;
 450    }
 451
 452    // Reinstall
 453    if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
 454        P.Delete() == false)
 455    {
 456       if (Inverse == false)
 457          iDownloadSize += P.InstVerIter(*this)->Size;
 458       else
 459          iDownloadSize -= P.InstVerIter(*this)->Size;
 460       return;
 461    }
 462
 463    // Removing
 464    if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
 465    {
 466       if (Inverse == false)
 467          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 468       else
 469          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 470       return;
 471    }
 472 }
 473                                                                         /*}}}*/
 474 // DepCache::AddStates - Add the package to the state counter           /*{{{*/
 475 // ---------------------------------------------------------------------
 476 /* This routine is tricky to use, you must make sure that it is never
 477    called twice for the same package. This means the Remove/Add section
 478    should be as short as possible and not encompass any code that will
 479    calld Remove/Add itself. Remember, dependencies can be circular so
 480    while processing a dep for Pkg it is possible that Add/Remove
 481    will be called on Pkg */
 482 void pkgDepCache::AddStates(const PkgIterator &Pkg, bool const Invert)
 483 {
 484    signed char const Add = (Invert == false) ? 1 : -1;
 485    StateCache &State = PkgState[Pkg->ID];
 486
 487    // The Package is broken (either minimal dep or policy dep)
 488    if ((State.DepState & DepInstMin) != DepInstMin)
 489       iBrokenCount += Add;
 490    if ((State.DepState & DepInstPolicy) != DepInstPolicy)
 491       iPolicyBrokenCount += Add;
 492
 493    // Bad state
 494    if (Pkg.State() != PkgIterator::NeedsNothing)
 495       iBadCount += Add;
 496
 497    // Not installed
 498    if (Pkg->CurrentVer == 0)
 499    {
 500       if (State.Mode == ModeDelete &&
 501           (State.iFlags & Purge) == Purge && Pkg.Purge() == false)
 502          iDelCount += Add;
 503
 504       if (State.Mode == ModeInstall)
 505          iInstCount += Add;
 506       return;
 507    }
 508
 509    // Installed, no upgrade
 510    if (State.Status == 0)
 511    {
 512       if (State.Mode == ModeDelete)
 513          iDelCount += Add;
 514       else
 515          if ((State.iFlags & ReInstall) == ReInstall)
 516             iInstCount += Add;
 517
 518       return;
 519    }
 520
 521    // Alll 3 are possible
 522    if (State.Mode == ModeDelete)
 523       iDelCount += Add;
 524    if (State.Mode == ModeKeep)
 525       iKeepCount += Add;
 526    if (State.Mode == ModeInstall)
 527       iInstCount += Add;
 528 }
 529                                                                         /*}}}*/
 530 // DepCache::BuildGroupOrs - Generate the Or group dep data             /*{{{*/
 531 // ---------------------------------------------------------------------
 532 /* The or group results are stored in the last item of the or group. This
 533    allows easy detection of the state of a whole or'd group. */
 534 void pkgDepCache::BuildGroupOrs(VerIterator const &V)
 535 {
 536    unsigned char Group = 0;
 537
 538    for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 539    {
 540       // Build the dependency state.
 541       unsigned char &State = DepState[D->ID];
 542
 543       /* Invert for Conflicts. We have to do this twice to get the
 544          right sense for a conflicts group */
 545       if (D.IsNegative() == true)
 546          State = ~State;
 547
 548       // Add to the group if we are within an or..
 549       State &= 0x7;
 550       Group |= State;
 551       State |= Group << 3;
 552       if ((D->CompareOp & Dep::Or) != Dep::Or)
 553          Group = 0;
 554
 555       // Invert for Conflicts
 556       if (D.IsNegative() == true)
 557          State = ~State;
 558    }
 559 }
 560                                                                         /*}}}*/
 561 // DepCache::VersionState - Perform a pass over a dependency list       /*{{{*/
 562 // ---------------------------------------------------------------------
 563 /* This is used to run over a dependency list and determine the dep
 564    state of the list, filtering it through both a Min check and a Policy
 565    check. The return result will have SetMin/SetPolicy low if a check
 566    fails. It uses the DepState cache for it's computations. */
 567 unsigned char pkgDepCache::VersionState(DepIterator D,unsigned char Check,
 568                                        unsigned char SetMin,
 569                                        unsigned char SetPolicy)
 570 {
 571    unsigned char Dep = 0xFF;
 572
 573    while (D.end() != true)
 574    {
 575       // Compute a single dependency element (glob or)
 576       DepIterator Start = D;
 577       unsigned char State = 0;
 578       for (bool LastOR = true; D.end() == false && LastOR == true; ++D)
 579       {
 580          State |= DepState[D->ID];
 581          LastOR = (D->CompareOp & Dep::Or) == Dep::Or;
 582       }
 583
 584       // Minimum deps that must be satisfied to have a working package
 585       if (Start.IsCritical() == true)
 586          if ((State & Check) != Check)
 587             Dep &= ~SetMin;
 588
 589       // Policy deps that must be satisfied to install the package
 590       if (IsImportantDep(Start) == true &&
 591           (State & Check) != Check)
 592          Dep &= ~SetPolicy;
 593    }
 594
 595    return Dep;
 596 }
 597                                                                         /*}}}*/
 598 // DepCache::DependencyState - Compute the 3 results for a dep          /*{{{*/
 599 // ---------------------------------------------------------------------
 600 /* This is the main dependency computation bit. It computes the 3 main
 601    results for a dependencys, Now, Install and Candidate. Callers must
 602    invert the result if dealing with conflicts. */
 603 unsigned char pkgDepCache::DependencyState(DepIterator &D)
 604 {
 605    unsigned char State = 0;
 606
 607    if (CheckDep(D,NowVersion) == true)
 608       State |= DepNow;
 609    if (CheckDep(D,InstallVersion) == true)
 610       State |= DepInstall;
 611    if (CheckDep(D,CandidateVersion) == true)
 612       State |= DepCVer;
 613
 614    return State;
 615 }
 616                                                                         /*}}}*/
 617 // DepCache::UpdateVerState - Compute the Dep member of the state       /*{{{*/
 618 // ---------------------------------------------------------------------
 619 /* This determines the combined dependency representation of a package
 620    for its two states now and install. This is done by using the pre-generated
 621    dependency information. */
 622 void pkgDepCache::UpdateVerState(PkgIterator Pkg)
 623 {
 624    // Empty deps are always true
 625    StateCache &State = PkgState[Pkg->ID];
 626    State.DepState = 0xFF;
 627
 628    // Check the Current state
 629    if (Pkg->CurrentVer != 0)
 630    {
 631       DepIterator D = Pkg.CurrentVer().DependsList();
 632       State.DepState &= VersionState(D,DepNow,DepNowMin,DepNowPolicy);
 633    }
 634
 635    /* Check the candidate state. We do not compare against the whole as
 636       a candidate state but check the candidate version against the
 637       install states */
 638    if (State.CandidateVer != 0)
 639    {
 640       DepIterator D = State.CandidateVerIter(*this).DependsList();
 641       State.DepState &= VersionState(D,DepInstall,DepCandMin,DepCandPolicy);
 642    }
 643
 644    // Check target state which can only be current or installed
 645    if (State.InstallVer != 0)
 646    {
 647       DepIterator D = State.InstVerIter(*this).DependsList();
 648       State.DepState &= VersionState(D,DepInstall,DepInstMin,DepInstPolicy);
 649    }
 650 }
 651                                                                         /*}}}*/
 652 // DepCache::Update - Figure out all the state information              /*{{{*/
 653 // ---------------------------------------------------------------------
 654 /* This will figure out the state of all the packages and all the
 655    dependencies based on the current policy. */
 656 void pkgDepCache::Update(OpProgress *Prog)
 657 {
 658    iUsrSize = 0;
 659    iDownloadSize = 0;
 660    iDelCount = 0;
 661    iInstCount = 0;
 662    iKeepCount = 0;
 663    iBrokenCount = 0;
 664    iBadCount = 0;
 665
 666    // Perform the depends pass
 667    int Done = 0;
 668    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 669    {
 670       if (Prog != 0 && Done%20 == 0)
 671          Prog->Progress(Done);
 672       for (VerIterator V = I.VersionList(); V.end() != true; ++V)
 673       {
 674          unsigned char Group = 0;
 675
 676          for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 677          {
 678             // Build the dependency state.
 679             unsigned char &State = DepState[D->ID];
 680             State = DependencyState(D);
 681
 682             // Add to the group if we are within an or..
 683             Group |= State;
 684             State |= Group << 3;
 685             if ((D->CompareOp & Dep::Or) != Dep::Or)
 686                Group = 0;
 687
 688             // Invert for Conflicts
 689             if (D.IsNegative() == true)
 690                State = ~State;
 691          }
 692       }
 693
 694       // Compute the package dependency state and size additions
 695       AddSizes(I);
 696       UpdateVerState(I);
 697       AddStates(I);
 698    }
 699
 700    if (Prog != 0)
 701       Prog->Progress(Done);
 702
 703    readStateFile(Prog);
 704 }
 705                                                                         /*}}}*/
 706 // DepCache::Update - Update the deps list of a package                 /*{{{*/
 707 // ---------------------------------------------------------------------
 708 /* This is a helper for update that only does the dep portion of the scan.
 709    It is mainly meant to scan reverse dependencies. */
 710 void pkgDepCache::Update(DepIterator D)
 711 {
 712    // Update the reverse deps
 713    for (;D.end() != true; ++D)
 714    {
 715       unsigned char &State = DepState[D->ID];
 716       State = DependencyState(D);
 717
 718       // Invert for Conflicts
 719       if (D.IsNegative() == true)
 720          State = ~State;
 721
 722       RemoveStates(D.ParentPkg());
 723       BuildGroupOrs(D.ParentVer());
 724       UpdateVerState(D.ParentPkg());
 725       AddStates(D.ParentPkg());
 726    }
 727 }
 728                                                                         /*}}}*/
 729 // DepCache::Update - Update the related deps of a package              /*{{{*/
 730 // ---------------------------------------------------------------------
 731 /* This is called whenever the state of a package changes. It updates
 732    all cached dependencies related to this package. */
 733 void pkgDepCache::Update(PkgIterator const &Pkg)
 734 {
 735    // Recompute the dep of the package
 736    RemoveStates(Pkg);
 737    UpdateVerState(Pkg);
 738    AddStates(Pkg);
 739
 740    // Update the reverse deps
 741    Update(Pkg.RevDependsList());
 742
 743    // Update the provides map for the current ver
 744    if (Pkg->CurrentVer != 0)
 745       for (PrvIterator P = Pkg.CurrentVer().ProvidesList();
 746            P.end() != true; ++P)
 747          Update(P.ParentPkg().RevDependsList());
 748
 749    // Update the provides map for the candidate ver
 750    if (PkgState[Pkg->ID].CandidateVer != 0)
 751       for (PrvIterator P = PkgState[Pkg->ID].CandidateVerIter(*this).ProvidesList();
 752            P.end() != true; ++P)
 753          Update(P.ParentPkg().RevDependsList());
 754 }
 755                                                                         /*}}}*/
 756 // DepCache::MarkKeep - Put the package in the keep state               /*{{{*/
 757 // ---------------------------------------------------------------------
 758 /* */
 759 bool pkgDepCache::MarkKeep(PkgIterator const &Pkg, bool Soft, bool FromUser,
 760                            unsigned long Depth)
 761 {
 762    if (IsModeChangeOk(ModeKeep, Pkg, Depth, FromUser) == false)
 763       return false;
 764
 765    /* Reject an attempt to keep a non-source broken installed package, those
 766       must be upgraded */
 767    if (Pkg.State() == PkgIterator::NeedsUnpack &&
 768        Pkg.CurrentVer().Downloadable() == false)
 769       return false;
 770
 771    /* We changed the soft state all the time so the UI is a bit nicer
 772       to use */
 773    StateCache &P = PkgState[Pkg->ID];
 774
 775    // Check that it is not already kept
 776    if (P.Mode == ModeKeep)
 777       return true;
 778
 779    if (Soft == true)
 780       P.iFlags |= AutoKept;
 781    else
 782       P.iFlags &= ~AutoKept;
 783
 784    ActionGroup group(*this);
 785
 786 #if 0 // reseting the autoflag here means we lose the
 787       // auto-mark information if a user selects a package for removal
 788       // but changes  his mind then and sets it for keep again
 789       // - this makes sense as default when all Garbage dependencies
 790       //   are automatically marked for removal (as aptitude does).
 791       //   setting a package for keep then makes it no longer autoinstalled
 792       //   for all other use-case this action is rather suprising
 793    if(FromUser && !P.Marked)
 794      P.Flags &= ~Flag::Auto;
 795 #endif
 796
 797    if (DebugMarker == true)
 798       std::clog << OutputInDepth(Depth) << "MarkKeep " << Pkg << " FU=" << FromUser << std::endl;
 799
 800    RemoveSizes(Pkg);
 801    RemoveStates(Pkg);
 802
 803    P.Mode = ModeKeep;
 804    if (Pkg->CurrentVer == 0)
 805       P.InstallVer = 0;
 806    else
 807       P.InstallVer = Pkg.CurrentVer();
 808
 809    AddStates(Pkg);
 810    Update(Pkg);
 811    AddSizes(Pkg);
 812
 813    return true;
 814 }
 815                                                                         /*}}}*/
 816 // DepCache::MarkDelete - Put the package in the delete state           /*{{{*/
 817 // ---------------------------------------------------------------------
 818 /* */
 819 bool pkgDepCache::MarkDelete(PkgIterator const &Pkg, bool rPurge,
 820                              unsigned long Depth, bool FromUser)
 821 {
 822    if (IsModeChangeOk(ModeDelete, Pkg, Depth, FromUser) == false)
 823       return false;
 824
 825    StateCache &P = PkgState[Pkg->ID];
 826
 827    // Check that it is not already marked for delete
 828    if ((P.Mode == ModeDelete || P.InstallVer == 0) &&
 829        (Pkg.Purge() == true || rPurge == false))
 830       return true;
 831
 832    // check if we are allowed to remove the package
 833    if (IsDeleteOk(Pkg,rPurge,Depth,FromUser) == false)
 834       return false;
 835
 836    P.iFlags &= ~(AutoKept | Purge);
 837    if (rPurge == true)
 838       P.iFlags |= Purge;
 839
 840    ActionGroup group(*this);
 841
 842    if (DebugMarker == true)
 843       std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << Pkg << " FU=" << FromUser << std::endl;
 844
 845    RemoveSizes(Pkg);
 846    RemoveStates(Pkg);
 847
 848    if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
 849       P.Mode = ModeKeep;
 850    else
 851       P.Mode = ModeDelete;
 852    P.InstallVer = 0;
 853
 854    AddStates(Pkg);
 855    Update(Pkg);
 856    AddSizes(Pkg);
 857
 858    return true;
 859 }
 860                                                                         /*}}}*/
 861 // DepCache::IsDeleteOk - check if it is ok to remove this package      /*{{{*/
 862 // ---------------------------------------------------------------------
 863 /* The default implementation tries to prevent deletion of install requests.
 864    dpkg holds are enforced by the private IsModeChangeOk */
 865 bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
 866                               unsigned long Depth, bool FromUser)
 867 {
 868    return IsDeleteOkProtectInstallRequests(Pkg, rPurge, Depth, FromUser);
 869 }
 870 bool pkgDepCache::IsDeleteOkProtectInstallRequests(PkgIterator const &Pkg,
 871       bool const rPurge, unsigned long const Depth, bool const FromUser)
 872 {
 873    if (FromUser == false && Pkg->CurrentVer == 0)
 874    {
 875       StateCache &P = PkgState[Pkg->ID];
 876       if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
 877       {
 878          if (DebugMarker == true)
 879             std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << Pkg << std::endl;
 880          return false;
 881       }
 882    }
 883    return true;
 884 }
 885                                                                         /*}}}*/
 886 // DepCache::IsModeChangeOk - check if it is ok to change the mode      /*{{{*/
 887 // ---------------------------------------------------------------------
 888 /* this is used by all Mark methods on the very first line to check sanity
 889    and prevents mode changes for packages on hold for example.
 890    If you want to check Mode specific stuff you can use the virtual public
 891    Is<Mode>Ok methods instead */
 892 char const* PrintMode(char const mode)
 893 {
 894          switch (mode)
 895          {
 896          case pkgDepCache::ModeInstall: return "Install";
 897          case pkgDepCache::ModeKeep: return "Keep";
 898          case pkgDepCache::ModeDelete: return "Delete";
 899          default: return "UNKNOWN";
 900          }
 901 }
 902 bool pkgDepCache::IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg,
 903                                  unsigned long const Depth, bool const FromUser)
 904 {
 905    // we are not trying to hard…
 906    if (unlikely(Depth > 100))
 907       return false;
 908
 909    // general sanity
 910    if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
 911       return false;
 912
 913    // the user is always right
 914    if (FromUser == true)
 915       return true;
 916
 917    StateCache &P = PkgState[Pkg->ID];
 918    // not changing the mode is obviously also fine as we might want to call
 919    // e.g. MarkInstall multiple times with different arguments for the same package
 920    if (P.Mode == mode)
 921       return true;
 922
 923    // if previous state was set by user only user can reset it
 924    if ((P.iFlags & Protected) == Protected)
 925    {
 926       if (unlikely(DebugMarker == true))
 927          std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
 928                    << " of " << Pkg << " as its mode (" << PrintMode(P.Mode)
 929                    << ") is protected" << std::endl;
 930       return false;
 931    }
 932    // enforce dpkg holds
 933    else if (mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 934             _config->FindB("APT::Ignore-Hold",false) == false)
 935    {
 936       if (unlikely(DebugMarker == true))
 937          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 938                    << " of " << Pkg << std::endl;
 939       return false;
 940    }
 941
 942    return true;
 943 }
 944                                                                         /*}}}*/
 945 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 946 // ---------------------------------------------------------------------
 947 /* */
 948 struct CompareProviders {
 949    pkgCache::PkgIterator const Pkg;
 950    CompareProviders(pkgCache::DepIterator const &Dep) : Pkg(Dep.TargetPkg()) {};
 951    //bool operator() (APT::VersionList::iterator const &AV, APT::VersionList::iterator const &BV)
 952    bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
 953    {
 954       pkgCache::PkgIterator const A = AV.ParentPkg();
 955       pkgCache::PkgIterator const B = BV.ParentPkg();
 956       // Prefer MA:same packages if other architectures for it are installed
 957       if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same ||
 958           (BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 959       {
 960          bool instA = false;
 961          if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 962          {
 963             pkgCache::GrpIterator Grp = A.Group();
 964             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 965                if (P->CurrentVer != 0)
 966                {
 967                   instA = true;
 968                   break;
 969                }
 970          }
 971          bool instB = false;
 972          if ((BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 973          {
 974             pkgCache::GrpIterator Grp = B.Group();
 975             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 976             {
 977                if (P->CurrentVer != 0)
 978                {
 979                   instB = true;
 980                   break;
 981                }
 982             }
 983          }
 984          if (instA != instB)
 985             return instA == false;
 986       }
 987       // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
 988       if (A->Group != B->Group)
 989       {
 990          if (A->Group == Pkg->Group && B->Group != Pkg->Group)
 991             return false;
 992          else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
 993             return true;
 994       }
 995       // we like essentials
 996       if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
 997       {
 998          if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 999             return false;
1000          else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
1001             return true;
1002       }
1003       if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
1004       {
1005          if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1006             return false;
1007          else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1008             return true;
1009       }
1010       // prefer native architecture
1011       if (strcmp(A.Arch(), B.Arch()) != 0)
1012       {
1013          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
1014             return false;
1015          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
1016             return true;
1017          std::vector<std::string> archs = APT::Configuration::getArchitectures();
1018          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
1019             if (*a == A.Arch())
1020                return false;
1021             else if (*a == B.Arch())
1022                return true;
1023       }
1024       // higher priority seems like a good idea
1025       if (AV->Priority != BV->Priority)
1026          return AV->Priority > BV->Priority;
1027       // unable to decide…
1028       return A->ID < B->ID;
1029    }
1030 };
1031 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
1032                               unsigned long Depth, bool FromUser,
1033                               bool ForceImportantDeps)
1034 {
1035    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
1036       return false;
1037
1038    StateCache &P = PkgState[Pkg->ID];
1039
1040    // See if there is even any possible instalation candidate
1041    if (P.CandidateVer == 0)
1042       return false;
1043
1044    /* Check that it is not already marked for install and that it can be
1045       installed */
1046    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1047        (P.Mode == ModeInstall ||
1048         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1049    {
1050       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1051          return MarkKeep(Pkg, false, FromUser, Depth+1);
1052       return true;
1053    }
1054
1055    // check if we are allowed to install the package (if we haven't already)
1056    if (P.Mode != ModeInstall || P.InstallVer != P.CandidateVer)
1057       if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1058          return false;
1059
1060    ActionGroup group(*this);
1061    P.iFlags &= ~AutoKept;
1062
1063    /* Target the candidate version and remove the autoflag. We reset the
1064       autoflag below if this was called recursively. Otherwise the user
1065       should have the ability to de-auto a package by changing its state */
1066    RemoveSizes(Pkg);
1067    RemoveStates(Pkg);
1068
1069    P.Mode = ModeInstall;
1070    P.InstallVer = P.CandidateVer;
1071
1072    if(FromUser)
1073      {
1074        // Set it to manual if it's a new install or already installed,
1075        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1076        // or if we do automatic installation (aptitude never does it)
1077        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1078          P.Flags &= ~Flag::Auto;
1079      }
1080    else
1081      {
1082        // Set it to auto if this is a new install.
1083        if(P.Status == 2)
1084          P.Flags |= Flag::Auto;
1085      }
1086    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1087       P.Mode = ModeKeep;
1088
1089    AddStates(Pkg);
1090    Update(Pkg);
1091    AddSizes(Pkg);
1092
1093    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1094       return true;
1095
1096    if (DebugMarker == true)
1097       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1098
1099    DepIterator Dep = P.InstVerIter(*this).DependsList();
1100    for (; Dep.end() != true;)
1101    {
1102       // Grok or groups
1103       DepIterator Start = Dep;
1104       bool Result = true;
1105       unsigned Ors = 0;
1106       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1107       {
1108          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1109
1110          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1111             Result = false;
1112       }
1113
1114       // Dep is satisfied okay.
1115       if (Result == false)
1116          continue;
1117
1118       /* Check if this dep should be consider for install. If it is a user
1119          defined important dep and we are installed a new package then
1120          it will be installed. Otherwise we only check for important
1121          deps that have changed from the installed version
1122       */
1123       if (IsImportantDep(Start) == false)
1124          continue;
1125
1126       /* If we are in an or group locate the first or that can
1127          succeed. We have already cached this.. */
1128       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1129          ++Start;
1130       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1131       {
1132          if(DebugAutoInstall == true)
1133             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1134          if (Start.IsCritical() == false)
1135             continue;
1136          // if the dependency was critical, we can't install it, so remove it again
1137          MarkDelete(Pkg,false,Depth + 1, false);
1138          return false;
1139       }
1140
1141       /* Check if any ImportantDep() (but not Critical) were added
1142        * since we installed the package.  Also check for deps that
1143        * were satisfied in the past: for instance, if a version
1144        * restriction in a Recommends was tightened, upgrading the
1145        * package should follow that Recommends rather than causing the
1146        * dependency to be removed. (bug #470115)
1147        */
1148       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1149       {
1150          bool isNewImportantDep = true;
1151          bool isPreviouslySatisfiedImportantDep = false;
1152          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1153          {
1154             //FIXME: Should we handle or-group better here?
1155             // We do not check if the package we look for is part of the same or-group
1156             // we might find while searching, but could that really be a problem?
1157             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1158                 Start.TargetPkg() != D.TargetPkg())
1159                continue;
1160
1161             isNewImportantDep = false;
1162
1163             while ((D->CompareOp & Dep::Or) != 0)
1164                ++D;
1165
1166             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1167             if (isPreviouslySatisfiedImportantDep == true)
1168                break;
1169          }
1170
1171          if(isNewImportantDep == true)
1172          {
1173             if (DebugAutoInstall == true)
1174                std::clog << OutputInDepth(Depth) << "new important dependency: "
1175                          << Start.TargetPkg().FullName() << std::endl;
1176          }
1177          else if(isPreviouslySatisfiedImportantDep == true)
1178          {
1179             if (DebugAutoInstall == true)
1180                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1181                          << Start.TargetPkg().FullName() << std::endl;
1182          }
1183          else
1184          {
1185             if (DebugAutoInstall == true)
1186                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1187                          << Start.TargetPkg().FullName() << std::endl;
1188             continue;
1189          }
1190       }
1191
1192       /* This bit is for processing the possibilty of an install/upgrade
1193          fixing the problem for "positive" dependencies */
1194       if (Start.IsNegative() == false && (DepState[Start->ID] & DepCVer) == DepCVer)
1195       {
1196          APT::VersionList verlist;
1197          pkgCache::VerIterator Cand = PkgState[Start.TargetPkg()->ID].CandidateVerIter(*this);
1198          if (Cand.end() == false && Start.IsSatisfied(Cand) == true)
1199             verlist.insert(Cand);
1200          for (PrvIterator Prv = Start.TargetPkg().ProvidesList(); Prv.end() != true; ++Prv)
1201          {
1202             pkgCache::VerIterator V = Prv.OwnerVer();
1203             pkgCache::VerIterator Cand = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1204             if (Cand.end() == true || V != Cand || Start.IsSatisfied(Prv) == false)
1205                continue;
1206             verlist.insert(Cand);
1207          }
1208          CompareProviders comp(Start);
1209
1210          do {
1211             APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1212
1213             if (InstVer == verlist.end())
1214                break;
1215
1216             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1217             if(DebugAutoInstall == true)
1218                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1219                          << " as " << Start.DepType() << " of " << Pkg.Name()
1220                          << std::endl;
1221             if (MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps) == false)
1222             {
1223                verlist.erase(InstVer);
1224                continue;
1225             }
1226             // now check if we should consider it a automatic dependency or not
1227             if(InstPkg->CurrentVer == 0 && Pkg->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
1228             {
1229                if(DebugAutoInstall == true)
1230                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1231                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1232                MarkAuto(InstPkg, false);
1233             }
1234             break;
1235          } while(true);
1236          continue;
1237       }
1238       /* Negative dependencies have no or-group
1239          If the dependency isn't versioned, we try if an upgrade might solve the problem.
1240          Otherwise we remove the offender if needed */
1241       else if (Start.IsNegative() == true && Start->Type != pkgCache::Dep::Obsoletes)
1242       {
1243          SPtrArray<Version *> List = Start.AllTargets();
1244          pkgCache::PkgIterator TrgPkg = Start.TargetPkg();
1245          for (Version **I = List; *I != 0; I++)
1246          {
1247             VerIterator Ver(*this,*I);
1248             PkgIterator Pkg = Ver.ParentPkg();
1249
1250             /* The List includes all packages providing this dependency,
1251                even providers which are not installed, so skip them. */
1252             if (PkgState[Pkg->ID].InstallVer == 0)
1253                continue;
1254
1255             if ((Start->Version != 0 || TrgPkg != Pkg) &&
1256                 PkgState[Pkg->ID].CandidateVer != PkgState[Pkg->ID].InstallVer &&
1257                 PkgState[Pkg->ID].CandidateVer != *I &&
1258                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1259                continue;
1260             else if (Start->Type == pkgCache::Dep::Conflicts ||
1261                      Start->Type == pkgCache::Dep::DpkgBreaks)
1262             {
1263                if(DebugAutoInstall == true)
1264                   std::clog << OutputInDepth(Depth)
1265                             << " Removing: " << Pkg.Name()
1266                             << std::endl;
1267                if (MarkDelete(Pkg,false,Depth + 1, false) == false)
1268                   break;
1269             }
1270          }
1271          continue;
1272       }
1273    }
1274
1275    return Dep.end() == true;
1276 }
1277                                                                         /*}}}*/
1278 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1279 // ---------------------------------------------------------------------
1280 /* The default implementation checks if the installation of an M-A:same
1281    package would lead us into a version-screw and if so forbids it.
1282    dpkg holds are enforced by the private IsModeChangeOk */
1283 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1284                               unsigned long Depth, bool FromUser)
1285 {
1286    return IsInstallOkMultiArchSameVersionSynced(Pkg,AutoInst, Depth, FromUser);
1287 }
1288 bool pkgDepCache::IsInstallOkMultiArchSameVersionSynced(PkgIterator const &Pkg,
1289       bool const AutoInst, unsigned long const Depth, bool const FromUser)
1290 {
1291    if (FromUser == true) // as always: user is always right
1292       return true;
1293
1294    // ignore packages with none-M-A:same candidates
1295    VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
1296    if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer() ||
1297          (CandVer->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1298       return true;
1299
1300    GrpIterator const Grp = Pkg.Group();
1301    for (PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1302    {
1303       // not installed or version synced: fine by definition
1304       // (simple string-compare as stuff like '1' == '0:1-0' can't happen here)
1305       if (P->CurrentVer == 0 || strcmp(Pkg.CandVersion(), P.CandVersion()) == 0)
1306          continue;
1307       // packages loosing M-A:same can be out-of-sync
1308       VerIterator CV = PkgState[P->ID].CandidateVerIter(*this);
1309       if (unlikely(CV.end() == true) ||
1310             (CV->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1311          continue;
1312
1313       // not downloadable means the package is obsolete, so allow out-of-sync
1314       if (CV.Downloadable() == false)
1315          continue;
1316
1317       PkgState[Pkg->ID].iFlags |= AutoKept;
1318       if (unlikely(DebugMarker == true))
1319          std::clog << OutputInDepth(Depth) << "Ignore MarkInstall of " << Pkg
1320             << " as its M-A:same siblings are not version-synced" << std::endl;
1321       return false;
1322    }
1323
1324    return true;
1325 }
1326                                                                         /*}}}*/
1327 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1328 // ---------------------------------------------------------------------
1329 /* */
1330 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1331 {
1332    if (unlikely(Pkg.end() == true))
1333       return;
1334
1335    APT::PackageList pkglist;
1336    if (Pkg->CurrentVer != 0 &&
1337        (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1338    {
1339       pkgCache::GrpIterator Grp = Pkg.Group();
1340       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1341       {
1342          if (P->CurrentVer != 0)
1343             pkglist.insert(P);
1344       }
1345    }
1346    else
1347       pkglist.insert(Pkg);
1348
1349    ActionGroup group(*this);
1350
1351    for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
1352    {
1353       RemoveSizes(Pkg);
1354       RemoveStates(Pkg);
1355
1356       StateCache &P = PkgState[Pkg->ID];
1357       if (To == true)
1358          P.iFlags |= ReInstall;
1359       else
1360          P.iFlags &= ~ReInstall;
1361
1362       AddStates(Pkg);
1363       AddSizes(Pkg);
1364    }
1365 }
1366                                                                         /*}}}*/
1367 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1368 // ---------------------------------------------------------------------
1369 /* */
1370 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1371 {
1372    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1373    StateCache &P = PkgState[Pkg->ID];
1374
1375    if (P.CandidateVer == TargetVer)
1376       return;
1377
1378    ActionGroup group(*this);
1379
1380    RemoveSizes(Pkg);
1381    RemoveStates(Pkg);
1382
1383    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1384       P.InstallVer = (Version *)TargetVer;
1385    P.CandidateVer = (Version *)TargetVer;
1386    P.Update(Pkg,*this);
1387
1388    AddStates(Pkg);
1389    Update(Pkg);
1390    AddSizes(Pkg);
1391
1392 }
1393                                                                         /*}}}*/
1394 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1395 // ---------------------------------------------------------------------
1396 /* changes the candidate of a package and walks over all its dependencies
1397    to check if it needs to change the candidate of the dependency, too,
1398    to reach a installable versionstate */
1399 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1400                                         std::string const &TargetRel)
1401 {
1402    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1403    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1404 }
1405 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1406                                         std::string const &TargetRel,
1407                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1408 {
1409    ActionGroup group(*this);
1410    SetCandidateVersion(TargetVer);
1411
1412    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1413       return true;
1414
1415    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1416    // save the position of the last element we will not undo - if we have to
1417    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1418
1419    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1420    {
1421       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1422           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1423            IsImportantDep(D) == false))
1424          continue;
1425
1426       // walk over an or-group and check if we need to do anything
1427       // for simpilicity no or-group is handled as a or-group including one dependency
1428       pkgCache::DepIterator Start = D;
1429       bool itsFine = false;
1430       for (bool stillOr = true; stillOr == true; ++Start)
1431       {
1432          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1433          pkgCache::PkgIterator const P = Start.TargetPkg();
1434          // virtual packages can't be a solution
1435          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1436             continue;
1437          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1438          // no versioned dependency - but is it installable?
1439          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1440          {
1441             // Check if one of the providers is installable
1442             if (P->ProvidesList != 0)
1443             {
1444                pkgCache::PrvIterator Prv = P.ProvidesList();
1445                for (; Prv.end() == false; ++Prv)
1446                {
1447                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1448                   if (C.end() == true || C != Prv.OwnerVer() ||
1449                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1450                      continue;
1451                   break;
1452                }
1453                if (Prv.end() == true)
1454                   continue;
1455             }
1456             // no providers, so check if we have an installable candidate version
1457             else if (Cand.end() == true ||
1458                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1459                continue;
1460             itsFine = true;
1461             break;
1462          }
1463          if (Cand.end() == true)
1464             continue;
1465          // check if the current candidate is enough for the versioned dependency - and installable?
1466          if (Start.IsSatisfied(Cand) == true &&
1467              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1468          {
1469             itsFine = true;
1470             break;
1471          }
1472       }
1473
1474       if (itsFine == true) {
1475          // something in the or-group was fine, skip all other members
1476          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1477          continue;
1478       }
1479
1480       // walk again over the or-group and check each if a candidate switch would help
1481       itsFine = false;
1482       for (bool stillOr = true; stillOr == true; ++D)
1483       {
1484          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1485          // changing candidate will not help if the dependency is not versioned
1486          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1487          {
1488             if (stillOr == true)
1489                continue;
1490             break;
1491          }
1492
1493          pkgCache::VerIterator V;
1494          if (TargetRel == "newest")
1495             V = D.TargetPkg().VersionList();
1496          else
1497             V = Match.Find(D.TargetPkg());
1498
1499          // check if the version from this release could satisfy the dependency
1500          if (V.end() == true || D.IsSatisfied(V) == false)
1501          {
1502             if (stillOr == true)
1503                continue;
1504             break;
1505          }
1506
1507          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1508          if (V == oldCand)
1509          {
1510             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1511             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1512                  c != Changed.end(); ++c)
1513             {
1514                if (c->first->ParentPkg != V->ParentPkg)
1515                   continue;
1516                itsFine = true;
1517                break;
1518             }
1519          }
1520
1521          if (itsFine == false)
1522          {
1523             // change the candidate
1524             Changed.push_back(make_pair(oldCand, TargetVer));
1525             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1526             {
1527                if (stillOr == false)
1528                   break;
1529                // undo the candidate changing
1530                SetCandidateVersion(oldCand);
1531                Changed.pop_back();
1532                continue;
1533             }
1534             itsFine = true;
1535          }
1536
1537          // something in the or-group was fine, skip all other members
1538          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1539          break;
1540       }
1541
1542       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1543       {
1544          // undo all changes which aren't lead to a solution
1545          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1546               c != Changed.end(); ++c)
1547             SetCandidateVersion(c->first);
1548          Changed.erase(newChanged, Changed.end());
1549          return false;
1550       }
1551    }
1552    return true;
1553 }
1554                                                                         /*}}}*/
1555 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1556 // ---------------------------------------------------------------------
1557 /* */
1558 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1559 {
1560   StateCache &state = PkgState[Pkg->ID];
1561
1562   ActionGroup group(*this);
1563
1564   if(Auto)
1565     state.Flags |= Flag::Auto;
1566   else
1567     state.Flags &= ~Flag::Auto;
1568 }
1569                                                                         /*}}}*/
1570 // StateCache::Update - Compute the various static display things       /*{{{*/
1571 // ---------------------------------------------------------------------
1572 /* This is called whenever the Candidate version changes. */
1573 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1574 {
1575    // Some info
1576    VerIterator Ver = CandidateVerIter(Cache);
1577
1578    // Use a null string or the version string
1579    if (Ver.end() == true)
1580       CandVersion = "";
1581    else
1582       CandVersion = Ver.VerStr();
1583
1584    // Find the current version
1585    CurVersion = "";
1586    if (Pkg->CurrentVer != 0)
1587       CurVersion = Pkg.CurrentVer().VerStr();
1588
1589    // Strip off the epochs for display
1590    CurVersion = StripEpoch(CurVersion);
1591    CandVersion = StripEpoch(CandVersion);
1592
1593    // Figure out if its up or down or equal
1594    Status = Ver.CompareVer(Pkg.CurrentVer());
1595    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1596      Status = 2;
1597 }
1598                                                                         /*}}}*/
1599 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1600 // ---------------------------------------------------------------------
1601 /* */
1602 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1603 {
1604    if (Ver == 0)
1605       return 0;
1606
1607    // Strip any epoch
1608    for (const char *I = Ver; *I != 0; I++)
1609       if (*I == ':')
1610          return I + 1;
1611    return Ver;
1612 }
1613                                                                         /*}}}*/
1614 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1615 // ---------------------------------------------------------------------
1616 /* The default just returns the highest available version that is not
1617    a source and automatic. */
1618 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1619 {
1620    /* Not source/not automatic versions cannot be a candidate version
1621       unless they are already installed */
1622    VerIterator Last(*(pkgCache *)this,0);
1623
1624    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1625    {
1626       if (Pkg.CurrentVer() == I)
1627          return I;
1628
1629       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1630       {
1631          if ((J.File()->Flags & Flag::NotSource) != 0)
1632             continue;
1633
1634          /* Stash the highest version of a not-automatic source, we use it
1635             if there is nothing better */
1636          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1637              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1638          {
1639             if (Last.end() == true)
1640                Last = I;
1641             continue;
1642          }
1643
1644          return I;
1645       }
1646    }
1647
1648    return Last;
1649 }
1650                                                                         /*}}}*/
1651 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1652 // ---------------------------------------------------------------------
1653 /* */
1654 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1655 {
1656    if(Dep.IsCritical())
1657       return true;
1658    else if(Dep->Type == pkgCache::Dep::Recommends)
1659    {
1660       if (InstallRecommends)
1661          return true;
1662       // we suport a special mode to only install-recommends for certain
1663       // sections
1664       // FIXME: this is a meant as a temporarly solution until the
1665       //        recommends are cleaned up
1666       const char *sec = Dep.ParentVer().Section();
1667       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1668          return true;
1669    }
1670    else if(Dep->Type == pkgCache::Dep::Suggests)
1671       return InstallSuggests;
1672
1673    return false;
1674 }
1675                                                                         /*}}}*/
1676 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1677 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &Pkg)
1678 { return 0; };
1679 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &File)
1680 { return 0; };
1681                                                                         /*}}}*/
1682 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1683 {
1684   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1685   if(f->wasConstructedSuccessfully())
1686     return f;
1687   else
1688     {
1689       delete f;
1690       return NULL;
1691     }
1692 }
1693                                                                         /*}}}*/
1694 bool pkgDepCache::MarkFollowsRecommends()
1695 {
1696   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1697 }
1698
1699 bool pkgDepCache::MarkFollowsSuggests()
1700 {
1701   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1702 }
1703
1704 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1705 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1706 {
1707    if (_config->Find("APT::Solver", "internal") != "internal")
1708       return true;
1709
1710    bool follow_recommends;
1711    bool follow_suggests;
1712    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1713
1714    // init the states
1715    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1716    {
1717       PkgState[p->ID].Marked  = false;
1718       PkgState[p->ID].Garbage = false;
1719
1720       // debug output
1721       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1722          std::clog << "AutoDep: " << p.FullName() << std::endl;
1723    }
1724
1725    // init vars
1726    follow_recommends = MarkFollowsRecommends();
1727    follow_suggests   = MarkFollowsSuggests();
1728
1729
1730
1731    // do the mark part, this is the core bit of the algorithm
1732    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1733    {
1734       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1735           (p->Flags & Flag::Essential) ||
1736           (p->Flags & Flag::Important) ||
1737           userFunc.InRootSet(p) ||
1738           // be nice even then a required package violates the policy (#583517)
1739           // and do the full mark process also for required packages
1740           (p.CurrentVer().end() != true &&
1741            p.CurrentVer()->Priority == pkgCache::State::Required))
1742       {
1743          // the package is installed (and set to keep)
1744          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1745             MarkPackage(p, p.CurrentVer(),
1746                         follow_recommends, follow_suggests);
1747          // the package is to be installed
1748          else if(PkgState[p->ID].Install())
1749             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1750                         follow_recommends, follow_suggests);
1751       }
1752    }
1753
1754    return true;
1755 }
1756                                                                         /*}}}*/
1757 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1758 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1759                               const pkgCache::VerIterator &ver,
1760                               bool const &follow_recommends,
1761                               bool const &follow_suggests)
1762 {
1763    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1764
1765    // if we are marked already we are done
1766    if(state.Marked)
1767       return;
1768
1769    VerIterator const currver = pkg.CurrentVer();
1770    VerIterator const instver = state.InstVerIter(*this);
1771
1772 #if 0
1773    VerIterator const candver = state.CandidateVerIter(*this);
1774
1775    // If a package was garbage-collected but is now being marked, we
1776    // should re-select it
1777    // For cases when a pkg is set to upgrade and this trigger the
1778    // removal of a no-longer used dependency.  if the pkg is set to
1779    // keep again later it will result in broken deps
1780    if(state.Delete() && state.RemoveReason = Unused)
1781    {
1782       if(ver==candver)
1783          mark_install(pkg, false, false, NULL);
1784       else if(ver==pkg.CurrentVer())
1785          MarkKeep(pkg, false, false);
1786
1787       instver=state.InstVerIter(*this);
1788    }
1789 #endif
1790
1791    // For packages that are not going to be removed, ignore versions
1792    // other than the InstVer.  For packages that are going to be
1793    // removed, ignore versions other than the current version.
1794    if(!(ver == instver && !instver.end()) &&
1795       !(ver == currver && instver.end() && !ver.end()))
1796       return;
1797
1798    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1799
1800    if(debug_autoremove)
1801      {
1802        std::clog << "Marking: " << pkg.FullName();
1803        if(!ver.end())
1804          std::clog << " " << ver.VerStr();
1805        if(!currver.end())
1806          std::clog << ", Curr=" << currver.VerStr();
1807        if(!instver.end())
1808          std::clog << ", Inst=" << instver.VerStr();
1809        std::clog << std::endl;
1810      }
1811
1812    state.Marked=true;
1813
1814    if(ver.end() == true)
1815       return;
1816
1817      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1818      {
1819         if(d->Type == Dep::Depends ||
1820            d->Type == Dep::PreDepends ||
1821            (follow_recommends &&
1822             d->Type == Dep::Recommends) ||
1823            (follow_suggests &&
1824             d->Type == Dep::Suggests))
1825         {
1826            // Try all versions of this package.
1827            for(VerIterator V = d.TargetPkg().VersionList();
1828                !V.end(); ++V)
1829            {
1830               if(d.IsSatisfied(V))
1831               {
1832                 if(debug_autoremove)
1833                   {
1834                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1835                               << " " << d.ParentVer().VerStr() << " "
1836                               << d.DepType() << " " << d.TargetPkg().FullName();
1837                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1838                       {
1839                         std::clog << " (" << d.CompType() << " "
1840                                   << d.TargetVer() << ")";
1841                       }
1842                     std::clog << std::endl;
1843                   }
1844                  MarkPackage(V.ParentPkg(), V,
1845                              follow_recommends, follow_suggests);
1846               }
1847            }
1848            // Now try virtual packages
1849            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1850                !prv.end(); ++prv)
1851            {
1852               if(d.IsSatisfied(prv))
1853               {
1854                 if(debug_autoremove)
1855                   {
1856                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1857                               << d.ParentVer().VerStr() << " "
1858                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1859                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1860                       {
1861                         std::clog << " (" << d.CompType() << " "
1862                                   << d.TargetVer() << ")";
1863                       }
1864                     std::clog << ", provided by "
1865                               << prv.OwnerPkg().FullName() << " "
1866                               << prv.OwnerVer().VerStr()
1867                               << std::endl;
1868                   }
1869
1870                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1871                              follow_recommends, follow_suggests);
1872               }
1873            }
1874         }
1875      }
1876 }
1877                                                                         /*}}}*/
1878 bool pkgDepCache::Sweep()                                               /*{{{*/
1879 {
1880    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1881
1882    // do the sweep
1883    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1884    {
1885      StateCache &state=PkgState[p->ID];
1886
1887      // skip required packages
1888      if (!p.CurrentVer().end() &&
1889          (p.CurrentVer()->Priority == pkgCache::State::Required))
1890         continue;
1891
1892      // if it is not marked and it is installed, it's garbage
1893      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1894      {
1895         state.Garbage=true;
1896         if(debug_autoremove)
1897            std::clog << "Garbage: " << p.FullName() << std::endl;
1898      }
1899   }
1900
1901    return true;
1902 }
1903                                                                         /*}}}*/