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/versionmatch.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/sptr.h>
  17 #include <apt-pkg/fileutl.h>
  18 #include <apt-pkg/strutl.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/aptconfiguration.h>
  21 #include <apt-pkg/tagfile.h>
  22 #include <apt-pkg/progress.h>
  23 #include <apt-pkg/cacheset.h>
  24 #include <apt-pkg/pkgcache.h>
  25 #include <apt-pkg/cacheiterators.h>
  26 #include <apt-pkg/cachefile.h>
  27 #include <apt-pkg/macros.h>
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <list>
  32 #include <string>
  33 #include <utility>
  34 #include <vector>
  35 #include <algorithm>
  36 #include <iostream>
  37 #include <set>
  38
  39 #include <sys/stat.h>
  40
  41 #include <apti18n.h>
  42                                                                         /*}}}*/
  43
  44 using std::string;
  45
  46 // helper for Install-Recommends-Sections and Never-MarkAuto-Sections   /*{{{*/
  47 static bool
  48 ConfigValueInSubTree(const char* SubTree, const char *needle)
  49 {
  50    Configuration::Item const *Opts;
  51    Opts = _config->Tree(SubTree);
  52    if (Opts != 0 && Opts->Child != 0)
  53    {
  54       Opts = Opts->Child;
  55       for (; Opts != 0; Opts = Opts->Next)
  56       {
  57          if (Opts->Value.empty() == true)
  58             continue;
  59          if (strcmp(needle, Opts->Value.c_str()) == 0)
  60             return true;
  61       }
  62    }
  63    return false;
  64 }
  65                                                                         /*}}}*/
  66 pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :             /*{{{*/
  67   d(NULL), cache(cache), released(false)
  68 {
  69   ++cache.group_level;
  70 }
  71
  72 void pkgDepCache::ActionGroup::release()
  73 {
  74   if(!released)
  75     {
  76       if(cache.group_level == 0)
  77         std::cerr << "W: Unbalanced action groups, expect badness" << std::endl;
  78       else
  79         {
  80           --cache.group_level;
  81
  82           if(cache.group_level == 0)
  83             cache.MarkAndSweep();
  84         }
  85
  86       released = true;
  87     }
  88 }
  89
  90 pkgDepCache::ActionGroup::~ActionGroup()
  91 {
  92   release();
  93 }
  94                                                                         /*}}}*/
  95 // DepCache::pkgDepCache - Constructors                                 /*{{{*/
  96 // ---------------------------------------------------------------------
  97 /* */
  98 pkgDepCache::pkgDepCache(pkgCache * const pCache,Policy * const Plcy) :
  99   group_level(0), Cache(pCache), PkgState(0), DepState(0),
 100    iUsrSize(0), iDownloadSize(0), iInstCount(0), iDelCount(0), iKeepCount(0),
 101    iBrokenCount(0), iPolicyBrokenCount(0), iBadCount(0), d(NULL)
 102 {
 103    DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
 104    DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
 105    delLocalPolicy = 0;
 106    LocalPolicy = Plcy;
 107    if (LocalPolicy == 0)
 108       delLocalPolicy = LocalPolicy = new Policy;
 109 }
 110                                                                         /*}}}*/
 111 // DepCache::~pkgDepCache - Destructor                                  /*{{{*/
 112 // ---------------------------------------------------------------------
 113 /* */
 114 pkgDepCache::~pkgDepCache()
 115 {
 116    delete [] PkgState;
 117    delete [] DepState;
 118    delete delLocalPolicy;
 119 }
 120                                                                         /*}}}*/
 121 // DepCache::Init - Generate the initial extra structures.              /*{{{*/
 122 // ---------------------------------------------------------------------
 123 /* This allocats the extension buffers and initializes them. */
 124 bool pkgDepCache::Init(OpProgress * const Prog)
 125 {
 126    // Suppress mark updates during this operation (just in case) and
 127    // run a mark operation when Init terminates.
 128    ActionGroup actions(*this);
 129
 130    delete [] PkgState;
 131    delete [] DepState;
 132    PkgState = new StateCache[Head().PackageCount];
 133    DepState = new unsigned char[Head().DependsCount];
 134    memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
 135    memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
 136
 137    if (Prog != 0)
 138    {
 139       Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
 140                             _("Building dependency tree"));
 141       Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
 142    }
 143
 144    /* Set the current state of everything. In this state all of the
 145       packages are kept exactly as is. See AllUpgrade */
 146    int Done = 0;
 147    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 148    {
 149       if (Prog != 0 && Done%20 == 0)
 150          Prog->Progress(Done);
 151
 152       // Find the proper cache slot
 153       StateCache &State = PkgState[I->ID];
 154       State.iFlags = 0;
 155
 156       // Figure out the install version
 157       State.CandidateVer = GetCandidateVer(I);
 158       State.InstallVer = I.CurrentVer();
 159       State.Mode = ModeKeep;
 160
 161       State.Update(I,*this);
 162    }
 163
 164    if (Prog != 0)
 165    {
 166       Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
 167                             Head().PackageCount,
 168                             _("Building dependency tree"));
 169       Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
 170    }
 171
 172    Update(Prog);
 173
 174    if(Prog != 0)
 175       Prog->Done();
 176
 177    return true;
 178 }
 179                                                                         /*}}}*/
 180 bool pkgDepCache::readStateFile(OpProgress * const Prog)                /*{{{*/
 181 {
 182    FileFd state_file;
 183    string const state = _config->FindFile("Dir::State::extended_states");
 184    if(RealFileExists(state)) {
 185       state_file.Open(state, FileFd::ReadOnly);
 186       off_t const file_size = state_file.Size();
 187       if(Prog != NULL)
 188          Prog->OverallProgress(0, file_size, 1,
 189                                _("Reading state information"));
 190
 191       pkgTagFile tagfile(&state_file);
 192       pkgTagSection section;
 193       off_t amt = 0;
 194       bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 195       while(tagfile.Step(section)) {
 196          string const pkgname = section.FindS("Package");
 197          string pkgarch = section.FindS("Architecture");
 198          if (pkgarch.empty() == true)
 199             pkgarch = "any";
 200          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 201          // Silently ignore unknown packages and packages with no actual version.
 202          if(pkg.end() == true || pkg->VersionList == 0)
 203             continue;
 204
 205          short const reason = section.FindI("Auto-Installed", 0);
 206          if(reason > 0)
 207          {
 208             PkgState[pkg->ID].Flags |= Flag::Auto;
 209             if (unlikely(debug_autoremove))
 210                std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
 211             if (pkgarch == "any")
 212             {
 213                pkgCache::GrpIterator G = pkg.Group();
 214                for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
 215                   if (pkg->VersionList != 0)
 216                      PkgState[pkg->ID].Flags |= Flag::Auto;
 217             }
 218          }
 219          amt += section.size();
 220          if(Prog != NULL)
 221             Prog->OverallProgress(amt, file_size, 1,
 222                                   _("Reading state information"));
 223       }
 224       if(Prog != NULL)
 225          Prog->OverallProgress(file_size, file_size, 1,
 226                                _("Reading state information"));
 227    }
 228
 229    return true;
 230 }
 231                                                                         /*}}}*/
 232 bool pkgDepCache::writeStateFile(OpProgress * const /*prog*/, bool const InstalledOnly) /*{{{*/
 233 {
 234    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 235
 236    if(debug_autoremove)
 237       std::clog << "pkgDepCache::writeStateFile()" << std::endl;
 238
 239    FileFd StateFile;
 240    string const state = _config->FindFile("Dir::State::extended_states");
 241    if (CreateAPTDirectoryIfNeeded(_config->FindDir("Dir::State"), flNotFile(state)) == false)
 242       return false;
 243
 244    // if it does not exist, create a empty one
 245    if(!RealFileExists(state))
 246    {
 247       StateFile.Open(state, FileFd::WriteAtomic);
 248       StateFile.Close();
 249    }
 250
 251    // open it
 252    if(!StateFile.Open(state, FileFd::ReadOnly))
 253       return _error->Error(_("Failed to open StateFile %s"),
 254                            state.c_str());
 255
 256    FileFd OutFile(state, FileFd::ReadWrite | FileFd::Atomic);
 257    if (OutFile.IsOpen() == false || OutFile.Failed() == true)
 258       return _error->Error(_("Failed to write temporary StateFile %s"), state.c_str());
 259
 260    // first merge with the existing sections
 261    pkgTagFile tagfile(&StateFile);
 262    pkgTagSection section;
 263    std::set<string> pkgs_seen;
 264    while(tagfile.Step(section)) {
 265          string const pkgname = section.FindS("Package");
 266          string pkgarch = section.FindS("Architecture");
 267          if (pkgarch.empty() == true)
 268             pkgarch = "native";
 269          // Silently ignore unknown packages and packages with no actual
 270          // version.
 271          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 272          if(pkg.end() || pkg.VersionList().end())
 273             continue;
 274          StateCache const &P = PkgState[pkg->ID];
 275          bool newAuto = (P.Flags & Flag::Auto);
 276          // skip not installed or now-removed ones if requested
 277          if (InstalledOnly && (
 278              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 279              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 280          {
 281             // The section is obsolete if it contains no other tag
 282             unsigned int const count = section.Count();
 283             if (count < 2 ||
 284                 (count == 2 && section.Exists("Auto-Installed")) ||
 285                 (count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
 286                continue;
 287             else
 288                newAuto = false;
 289          }
 290          if(_config->FindB("Debug::pkgAutoRemove",false))
 291             std::clog << "Update existing AutoInstall info: "
 292                       << pkg.FullName() << std::endl;
 293
 294          std::vector<pkgTagSection::Tag> rewrite;
 295          rewrite.push_back(pkgTagSection::Tag::Rewrite("Architecture", pkg.Arch()));
 296          rewrite.push_back(pkgTagSection::Tag::Rewrite("Auto-Installed", newAuto ? "1" : "0"));
 297          section.Write(OutFile, NULL, rewrite);
 298          if (OutFile.Write("\n", 1) == false)
 299             return false;
 300          pkgs_seen.insert(pkg.FullName());
 301    }
 302
 303    // then write the ones we have not seen yet
 304    for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); ++pkg) {
 305       StateCache const &P = PkgState[pkg->ID];
 306       if(P.Flags & Flag::Auto) {
 307          if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
 308             if(debug_autoremove)
 309                std::clog << "Skipping already written " << pkg.FullName() << std::endl;
 310             continue;
 311          }
 312          // skip not installed ones if requested
 313          if (InstalledOnly && (
 314              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 315              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 316             continue;
 317          const char* const pkgarch = pkg.Arch();
 318          if (strcmp(pkgarch, "all") == 0)
 319             continue;
 320          if(debug_autoremove)
 321             std::clog << "Writing new AutoInstall: " << pkg.FullName() << std::endl;
 322          std::string stanza = "Package: ";
 323          stanza.append(pkg.Name())
 324               .append("\nArchitecture: ").append(pkgarch)
 325               .append("\nAuto-Installed: 1\n\n");
 326          if (OutFile.Write(stanza.c_str(), stanza.length()) == false)
 327             return false;
 328       }
 329    }
 330    if (OutFile.Close() == false)
 331       return false;
 332    chmod(state.c_str(), 0644);
 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 const &Dep,int const 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       // Check the base package
 352       if (Type == NowVersion)
 353       {
 354          if (Res->CurrentVer != 0 && Dep.IsSatisfied(Res.CurrentVer()) == true)
 355             return true;
 356       }
 357       else if (Type == InstallVersion)
 358       {
 359          if (PkgState[Res->ID].InstallVer != 0 &&
 360                Dep.IsSatisfied(PkgState[Res->ID].InstVerIter(*this)) == true)
 361             return true;
 362       }
 363       else if (Type == CandidateVersion)
 364          if (PkgState[Res->ID].CandidateVer != 0 &&
 365                Dep.IsSatisfied(PkgState[Res->ID].CandidateVerIter(*this)) == true)
 366             return true;
 367    }
 368
 369    if (Dep->Type == Dep::Obsoletes)
 370       return false;
 371
 372    // Check the providing packages
 373    PrvIterator P = Dep.TargetPkg().ProvidesList();
 374    for (; P.end() != true; ++P)
 375    {
 376       if (Dep.IsIgnorable(P) == true)
 377          continue;
 378
 379       // Check if the provides is a hit
 380       if (Type == NowVersion)
 381       {
 382          if (P.OwnerPkg().CurrentVer() != P.OwnerVer())
 383             continue;
 384       }
 385       else if (Type == InstallVersion)
 386       {
 387          StateCache &State = PkgState[P.OwnerPkg()->ID];
 388          if (State.InstallVer != (Version *)P.OwnerVer())
 389             continue;
 390       }
 391       else if (Type == CandidateVersion)
 392       {
 393          StateCache &State = PkgState[P.OwnerPkg()->ID];
 394          if (State.CandidateVer != (Version *)P.OwnerVer())
 395             continue;
 396       }
 397
 398       // Compare the versions.
 399       if (Dep.IsSatisfied(P) == true)
 400       {
 401          Res = P.OwnerPkg();
 402          return true;
 403       }
 404    }
 405
 406    return false;
 407 }
 408                                                                         /*}}}*/
 409 // DepCache::AddSizes - Add the packages sizes to the counters          /*{{{*/
 410 // ---------------------------------------------------------------------
 411 /* Call with Inverse = true to preform the inverse opration */
 412 void pkgDepCache::AddSizes(const PkgIterator &Pkg, bool const Inverse)
 413 {
 414    StateCache &P = PkgState[Pkg->ID];
 415
 416    if (Pkg->VersionList == 0)
 417       return;
 418
 419    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 420        P.Keep() == true)
 421       return;
 422
 423    // Compute the size data
 424    if (P.NewInstall() == true)
 425    {
 426       if (Inverse == false) {
 427          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 428          iDownloadSize += P.InstVerIter(*this)->Size;
 429       } else {
 430          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 431          iDownloadSize -= P.InstVerIter(*this)->Size;
 432       }
 433       return;
 434    }
 435
 436    // Upgrading
 437    if (Pkg->CurrentVer != 0 &&
 438        (P.InstallVer != (Version *)Pkg.CurrentVer() ||
 439         (P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
 440    {
 441       if (Inverse == false) {
 442          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 443          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 444          iDownloadSize += P.InstVerIter(*this)->Size;
 445       } else {
 446          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 447          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 448          iDownloadSize -= P.InstVerIter(*this)->Size;
 449       }
 450       return;
 451    }
 452
 453    // Reinstall
 454    if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
 455        P.Delete() == false)
 456    {
 457       if (Inverse == false)
 458          iDownloadSize += P.InstVerIter(*this)->Size;
 459       else
 460          iDownloadSize -= P.InstVerIter(*this)->Size;
 461       return;
 462    }
 463
 464    // Removing
 465    if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
 466    {
 467       if (Inverse == false)
 468          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 469       else
 470          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 471       return;
 472    }
 473 }
 474                                                                         /*}}}*/
 475 // DepCache::AddStates - Add the package to the state counter           /*{{{*/
 476 // ---------------------------------------------------------------------
 477 /* This routine is tricky to use, you must make sure that it is never
 478    called twice for the same package. This means the Remove/Add section
 479    should be as short as possible and not encompass any code that will
 480    calld Remove/Add itself. Remember, dependencies can be circular so
 481    while processing a dep for Pkg it is possible that Add/Remove
 482    will be called on Pkg */
 483 void pkgDepCache::AddStates(const PkgIterator &Pkg, bool const Invert)
 484 {
 485    signed char const Add = (Invert == false) ? 1 : -1;
 486    StateCache &State = PkgState[Pkg->ID];
 487
 488    // The Package is broken (either minimal dep or policy dep)
 489    if ((State.DepState & DepInstMin) != DepInstMin)
 490       iBrokenCount += Add;
 491    if ((State.DepState & DepInstPolicy) != DepInstPolicy)
 492       iPolicyBrokenCount += Add;
 493
 494    // Bad state
 495    if (Pkg.State() != PkgIterator::NeedsNothing)
 496       iBadCount += Add;
 497
 498    // Not installed
 499    if (Pkg->CurrentVer == 0)
 500    {
 501       if (State.Mode == ModeDelete &&
 502           (State.iFlags & Purge) == Purge && Pkg.Purge() == false)
 503          iDelCount += Add;
 504
 505       if (State.Mode == ModeInstall)
 506          iInstCount += Add;
 507       return;
 508    }
 509
 510    // Installed, no upgrade
 511    if (State.Status == 0)
 512    {
 513       if (State.Mode == ModeDelete)
 514          iDelCount += Add;
 515       else
 516          if ((State.iFlags & ReInstall) == ReInstall)
 517             iInstCount += Add;
 518       return;
 519    }
 520
 521    // Alll 3 are possible
 522    if (State.Mode == ModeDelete)
 523       iDelCount += Add;
 524    else if (State.Mode == ModeKeep)
 525       iKeepCount += Add;
 526    else 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    for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 538    {
 539       // Build the dependency state.
 540       unsigned char &State = DepState[D->ID];
 541
 542       /* Invert for Conflicts. We have to do this twice to get the
 543          right sense for a conflicts group */
 544       if (D.IsNegative() == true)
 545          State = ~State;
 546
 547       // Add to the group if we are within an or..
 548       State &= 0x7;
 549       Group |= State;
 550       State |= Group << 3;
 551       if ((D->CompareOp & Dep::Or) != Dep::Or)
 552          Group = 0;
 553
 554       // Invert for Conflicts
 555       if (D.IsNegative() == true)
 556          State = ~State;
 557    }
 558 }
 559                                                                         /*}}}*/
 560 // DepCache::VersionState - Perform a pass over a dependency list       /*{{{*/
 561 // ---------------------------------------------------------------------
 562 /* This is used to run over a dependency list and determine the dep
 563    state of the list, filtering it through both a Min check and a Policy
 564    check. The return result will have SetMin/SetPolicy low if a check
 565    fails. It uses the DepState cache for it's computations. */
 566 unsigned char pkgDepCache::VersionState(DepIterator D, unsigned char const Check,
 567                                        unsigned char const SetMin,
 568                                        unsigned char const SetPolicy) const
 569 {
 570    unsigned char Dep = 0xFF;
 571    while (D.end() != true)
 572    {
 573       // the last or-dependency has the state of all previous or'ed
 574       DepIterator Start, End;
 575       D.GlobOr(Start, End);
 576       // ignore if we are called with Dep{Install,…} or DepG{Install,…}
 577       // the later would be more correct, but the first is what we get
 578       unsigned char const State = DepState[End->ID] | (DepState[End->ID] >> 3);
 579
 580       // Minimum deps that must be satisfied to have a working package
 581       if (Start.IsCritical() == true)
 582       {
 583          if ((State & Check) != Check)
 584             return Dep &= ~(SetMin | SetPolicy);
 585       }
 586       // Policy deps that must be satisfied to install the package
 587       else if (IsImportantDep(Start) == true &&
 588           (State & Check) != Check)
 589          Dep &= ~SetPolicy;
 590    }
 591    return Dep;
 592 }
 593                                                                         /*}}}*/
 594 // DepCache::DependencyState - Compute the 3 results for a dep          /*{{{*/
 595 // ---------------------------------------------------------------------
 596 /* This is the main dependency computation bit. It computes the 3 main
 597    results for a dependencys, Now, Install and Candidate. Callers must
 598    invert the result if dealing with conflicts. */
 599 unsigned char pkgDepCache::DependencyState(DepIterator const &D)
 600 {
 601    unsigned char State = 0;
 602
 603    if (CheckDep(D,NowVersion) == true)
 604       State |= DepNow;
 605    if (CheckDep(D,InstallVersion) == true)
 606       State |= DepInstall;
 607    if (CheckDep(D,CandidateVersion) == true)
 608       State |= DepCVer;
 609
 610    return State;
 611 }
 612                                                                         /*}}}*/
 613 // DepCache::UpdateVerState - Compute the Dep member of the state       /*{{{*/
 614 // ---------------------------------------------------------------------
 615 /* This determines the combined dependency representation of a package
 616    for its two states now and install. This is done by using the pre-generated
 617    dependency information. */
 618 void pkgDepCache::UpdateVerState(PkgIterator const &Pkg)
 619 {
 620    // Empty deps are always true
 621    StateCache &State = PkgState[Pkg->ID];
 622    State.DepState = 0xFF;
 623
 624    // Check the Current state
 625    if (Pkg->CurrentVer != 0)
 626    {
 627       DepIterator D = Pkg.CurrentVer().DependsList();
 628       State.DepState &= VersionState(D,DepNow,DepNowMin,DepNowPolicy);
 629    }
 630
 631    /* Check the candidate state. We do not compare against the whole as
 632       a candidate state but check the candidate version against the
 633       install states */
 634    if (State.CandidateVer != 0)
 635    {
 636       DepIterator D = State.CandidateVerIter(*this).DependsList();
 637       State.DepState &= VersionState(D,DepInstall,DepCandMin,DepCandPolicy);
 638    }
 639
 640    // Check target state which can only be current or installed
 641    if (State.InstallVer != 0)
 642    {
 643       DepIterator D = State.InstVerIter(*this).DependsList();
 644       State.DepState &= VersionState(D,DepInstall,DepInstMin,DepInstPolicy);
 645    }
 646 }
 647                                                                         /*}}}*/
 648 // DepCache::Update - Figure out all the state information              /*{{{*/
 649 // ---------------------------------------------------------------------
 650 /* This will figure out the state of all the packages and all the
 651    dependencies based on the current policy. */
 652 void pkgDepCache::Update(OpProgress * const Prog)
 653 {
 654    iUsrSize = 0;
 655    iDownloadSize = 0;
 656    iInstCount = 0;
 657    iDelCount = 0;
 658    iKeepCount = 0;
 659    iBrokenCount = 0;
 660    iPolicyBrokenCount = 0;
 661    iBadCount = 0;
 662
 663    // Perform the depends pass
 664    int Done = 0;
 665    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 666    {
 667       if (Prog != 0 && Done%20 == 0)
 668          Prog->Progress(Done);
 669       for (VerIterator V = I.VersionList(); V.end() != true; ++V)
 670       {
 671          unsigned char Group = 0;
 672
 673          for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 674          {
 675             // Build the dependency state.
 676             unsigned char &State = DepState[D->ID];
 677             State = DependencyState(D);
 678
 679             // Add to the group if we are within an or..
 680             Group |= State;
 681             State |= Group << 3;
 682             if ((D->CompareOp & Dep::Or) != Dep::Or)
 683                Group = 0;
 684
 685             // Invert for Conflicts
 686             if (D.IsNegative() == true)
 687                State = ~State;
 688          }
 689       }
 690
 691       // Compute the package dependency state and size additions
 692       AddSizes(I);
 693       UpdateVerState(I);
 694       AddStates(I);
 695    }
 696
 697    if (Prog != 0)
 698       Prog->Progress(Done);
 699
 700    readStateFile(Prog);
 701 }
 702                                                                         /*}}}*/
 703 // DepCache::Update - Update the deps list of a package                 /*{{{*/
 704 // ---------------------------------------------------------------------
 705 /* This is a helper for update that only does the dep portion of the scan.
 706    It is mainly meant to scan reverse dependencies. */
 707 void pkgDepCache::Update(DepIterator D)
 708 {
 709    // Update the reverse deps
 710    for (;D.end() != true; ++D)
 711    {
 712       unsigned char &State = DepState[D->ID];
 713       State = DependencyState(D);
 714
 715       // Invert for Conflicts
 716       if (D.IsNegative() == true)
 717          State = ~State;
 718
 719       RemoveStates(D.ParentPkg());
 720       BuildGroupOrs(D.ParentVer());
 721       UpdateVerState(D.ParentPkg());
 722       AddStates(D.ParentPkg());
 723    }
 724 }
 725                                                                         /*}}}*/
 726 // DepCache::Update - Update the related deps of a package              /*{{{*/
 727 // ---------------------------------------------------------------------
 728 /* This is called whenever the state of a package changes. It updates
 729    all cached dependencies related to this package. */
 730 void pkgDepCache::Update(PkgIterator const &Pkg)
 731 {
 732    // Recompute the dep of the package
 733    RemoveStates(Pkg);
 734    UpdateVerState(Pkg);
 735    AddStates(Pkg);
 736
 737    // Update the reverse deps
 738    Update(Pkg.RevDependsList());
 739
 740    // Update the provides map for the current ver
 741    if (Pkg->CurrentVer != 0)
 742       for (PrvIterator P = Pkg.CurrentVer().ProvidesList();
 743            P.end() != true; ++P)
 744          Update(P.ParentPkg().RevDependsList());
 745
 746    // Update the provides map for the candidate ver
 747    if (PkgState[Pkg->ID].CandidateVer != 0)
 748       for (PrvIterator P = PkgState[Pkg->ID].CandidateVerIter(*this).ProvidesList();
 749            P.end() != true; ++P)
 750          Update(P.ParentPkg().RevDependsList());
 751 }
 752                                                                         /*}}}*/
 753 // DepCache::MarkKeep - Put the package in the keep state               /*{{{*/
 754 // ---------------------------------------------------------------------
 755 /* */
 756 bool pkgDepCache::MarkKeep(PkgIterator const &Pkg, bool Soft, bool FromUser,
 757                            unsigned long Depth)
 758 {
 759    if (IsModeChangeOk(ModeKeep, Pkg, Depth, FromUser) == false)
 760       return false;
 761
 762    /* Reject an attempt to keep a non-source broken installed package, those
 763       must be upgraded */
 764    if (Pkg.State() == PkgIterator::NeedsUnpack &&
 765        Pkg.CurrentVer().Downloadable() == false)
 766       return false;
 767
 768    /* We changed the soft state all the time so the UI is a bit nicer
 769       to use */
 770    StateCache &P = PkgState[Pkg->ID];
 771
 772    // Check that it is not already kept
 773    if (P.Mode == ModeKeep)
 774       return true;
 775
 776    if (Soft == true)
 777       P.iFlags |= AutoKept;
 778    else
 779       P.iFlags &= ~AutoKept;
 780
 781    ActionGroup group(*this);
 782
 783 #if 0 // reseting the autoflag here means we lose the
 784       // auto-mark information if a user selects a package for removal
 785       // but changes  his mind then and sets it for keep again
 786       // - this makes sense as default when all Garbage dependencies
 787       //   are automatically marked for removal (as aptitude does).
 788       //   setting a package for keep then makes it no longer autoinstalled
 789       //   for all other use-case this action is rather surprising
 790    if(FromUser && !P.Marked)
 791      P.Flags &= ~Flag::Auto;
 792 #endif
 793
 794    if (DebugMarker == true)
 795       std::clog << OutputInDepth(Depth) << "MarkKeep " << Pkg << " FU=" << FromUser << std::endl;
 796
 797    RemoveSizes(Pkg);
 798    RemoveStates(Pkg);
 799
 800    P.Mode = ModeKeep;
 801    if (Pkg->CurrentVer == 0)
 802       P.InstallVer = 0;
 803    else
 804       P.InstallVer = Pkg.CurrentVer();
 805
 806    AddStates(Pkg);
 807    Update(Pkg);
 808    AddSizes(Pkg);
 809
 810    return true;
 811 }
 812                                                                         /*}}}*/
 813 // DepCache::MarkDelete - Put the package in the delete state           /*{{{*/
 814 // ---------------------------------------------------------------------
 815 /* */
 816 bool pkgDepCache::MarkDelete(PkgIterator const &Pkg, bool rPurge,
 817                              unsigned long Depth, bool FromUser)
 818 {
 819    if (IsModeChangeOk(ModeDelete, Pkg, Depth, FromUser) == false)
 820       return false;
 821
 822    StateCache &P = PkgState[Pkg->ID];
 823
 824    // Check that it is not already marked for delete
 825    if ((P.Mode == ModeDelete || P.InstallVer == 0) &&
 826        (Pkg.Purge() == true || rPurge == false))
 827       return true;
 828
 829    // check if we are allowed to remove the package
 830    if (IsDeleteOk(Pkg,rPurge,Depth,FromUser) == false)
 831       return false;
 832
 833    P.iFlags &= ~(AutoKept | Purge);
 834    if (rPurge == true)
 835       P.iFlags |= Purge;
 836
 837    ActionGroup group(*this);
 838
 839    if (DebugMarker == true)
 840       std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << Pkg << " FU=" << FromUser << std::endl;
 841
 842    RemoveSizes(Pkg);
 843    RemoveStates(Pkg);
 844
 845    if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
 846       P.Mode = ModeKeep;
 847    else
 848       P.Mode = ModeDelete;
 849    P.InstallVer = 0;
 850
 851    AddStates(Pkg);
 852    Update(Pkg);
 853    AddSizes(Pkg);
 854
 855    return true;
 856 }
 857                                                                         /*}}}*/
 858 // DepCache::IsDeleteOk - check if it is ok to remove this package      /*{{{*/
 859 // ---------------------------------------------------------------------
 860 /* The default implementation tries to prevent deletion of install requests.
 861    dpkg holds are enforced by the private IsModeChangeOk */
 862 bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
 863                               unsigned long Depth, bool FromUser)
 864 {
 865    return IsDeleteOkProtectInstallRequests(Pkg, rPurge, Depth, FromUser);
 866 }
 867 bool pkgDepCache::IsDeleteOkProtectInstallRequests(PkgIterator const &Pkg,
 868       bool const /*rPurge*/, unsigned long const Depth, bool const FromUser)
 869 {
 870    if (FromUser == false && Pkg->CurrentVer == 0)
 871    {
 872       StateCache &P = PkgState[Pkg->ID];
 873       if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
 874       {
 875          if (DebugMarker == true)
 876             std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << Pkg << std::endl;
 877          return false;
 878       }
 879    }
 880    return true;
 881 }
 882                                                                         /*}}}*/
 883 // DepCache::IsModeChangeOk - check if it is ok to change the mode      /*{{{*/
 884 // ---------------------------------------------------------------------
 885 /* this is used by all Mark methods on the very first line to check sanity
 886    and prevents mode changes for packages on hold for example.
 887    If you want to check Mode specific stuff you can use the virtual public
 888    Is<Mode>Ok methods instead */
 889 static char const* PrintMode(char const mode)
 890 {
 891          switch (mode)
 892          {
 893          case pkgDepCache::ModeInstall: return "Install";
 894          case pkgDepCache::ModeKeep: return "Keep";
 895          case pkgDepCache::ModeDelete: return "Delete";
 896          case pkgDepCache::ModeGarbage: return "Garbage";
 897          default: return "UNKNOWN";
 898          }
 899 }
 900 bool pkgDepCache::IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg,
 901                                  unsigned long const Depth, bool const FromUser)
 902 {
 903    // we are not trying to hard…
 904    if (unlikely(Depth > 100))
 905       return false;
 906
 907    // general sanity
 908    if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
 909       return false;
 910
 911    // the user is always right
 912    if (FromUser == true)
 913       return true;
 914
 915    StateCache &P = PkgState[Pkg->ID];
 916    // not changing the mode is obviously also fine as we might want to call
 917    // e.g. MarkInstall multiple times with different arguments for the same package
 918    if (P.Mode == mode)
 919       return true;
 920
 921    // if previous state was set by user only user can reset it
 922    if ((P.iFlags & Protected) == Protected)
 923    {
 924       if (unlikely(DebugMarker == true))
 925          std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
 926                    << " of " << Pkg << " as its mode (" << PrintMode(P.Mode)
 927                    << ") is protected" << std::endl;
 928       return false;
 929    }
 930    // enforce dpkg holds
 931    else if (mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 932             _config->FindB("APT::Ignore-Hold",false) == false)
 933    {
 934       if (unlikely(DebugMarker == true))
 935          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 936                    << " of " << Pkg << std::endl;
 937       return false;
 938    }
 939
 940    return true;
 941 }
 942                                                                         /*}}}*/
 943 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 944 // ---------------------------------------------------------------------
 945 /* */
 946 struct CompareProviders {
 947    pkgCache::PkgIterator const Pkg;
 948    explicit CompareProviders(pkgCache::DepIterator const &Dep) : Pkg(Dep.TargetPkg()) {};
 949    //bool operator() (APT::VersionList::iterator const &AV, APT::VersionList::iterator const &BV)
 950    bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
 951    {
 952       pkgCache::PkgIterator const A = AV.ParentPkg();
 953       pkgCache::PkgIterator const B = BV.ParentPkg();
 954       // Prefer MA:same packages if other architectures for it are installed
 955       if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same ||
 956           (BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 957       {
 958          bool instA = false;
 959          if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 960          {
 961             pkgCache::GrpIterator Grp = A.Group();
 962             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 963                if (P->CurrentVer != 0)
 964                {
 965                   instA = true;
 966                   break;
 967                }
 968          }
 969          bool instB = false;
 970          if ((BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 971          {
 972             pkgCache::GrpIterator Grp = B.Group();
 973             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 974             {
 975                if (P->CurrentVer != 0)
 976                {
 977                   instB = true;
 978                   break;
 979                }
 980             }
 981          }
 982          if (instA != instB)
 983             return instA == false;
 984       }
 985       // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
 986       if (A->Group != B->Group)
 987       {
 988          if (A->Group == Pkg->Group && B->Group != Pkg->Group)
 989             return false;
 990          else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
 991             return true;
 992       }
 993       // we like essentials
 994       if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
 995       {
 996          if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 997             return false;
 998          else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 999             return true;
1000       }
1001       if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
1002       {
1003          if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1004             return false;
1005          else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1006             return true;
1007       }
1008       // prefer native architecture
1009       if (strcmp(A.Arch(), B.Arch()) != 0)
1010       {
1011          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
1012             return false;
1013          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
1014             return true;
1015          std::vector<std::string> archs = APT::Configuration::getArchitectures();
1016          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
1017             if (*a == A.Arch())
1018                return false;
1019             else if (*a == B.Arch())
1020                return true;
1021       }
1022       // higher priority seems like a good idea
1023       if (AV->Priority != BV->Priority)
1024          return AV->Priority > BV->Priority;
1025       // unable to decide…
1026       return A->ID < B->ID;
1027    }
1028 };
1029 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
1030                               unsigned long Depth, bool FromUser,
1031                               bool ForceImportantDeps)
1032 {
1033    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
1034       return false;
1035
1036    StateCache &P = PkgState[Pkg->ID];
1037
1038    // See if there is even any possible instalation candidate
1039    if (P.CandidateVer == 0)
1040       return false;
1041
1042    /* Check that it is not already marked for install and that it can be
1043       installed */
1044    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1045        (P.Mode == ModeInstall ||
1046         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1047    {
1048       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1049          return MarkKeep(Pkg, false, FromUser, Depth+1);
1050       return true;
1051    }
1052
1053    // check if we are allowed to install the package
1054    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1055       return false;
1056
1057    ActionGroup group(*this);
1058    P.iFlags &= ~AutoKept;
1059
1060    /* Target the candidate version and remove the autoflag. We reset the
1061       autoflag below if this was called recursively. Otherwise the user
1062       should have the ability to de-auto a package by changing its state */
1063    RemoveSizes(Pkg);
1064    RemoveStates(Pkg);
1065
1066    P.Mode = ModeInstall;
1067    P.InstallVer = P.CandidateVer;
1068
1069    if(FromUser)
1070      {
1071        // Set it to manual if it's a new install or already installed,
1072        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1073        // or if we do automatic installation (aptitude never does it)
1074        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1075          P.Flags &= ~Flag::Auto;
1076      }
1077    else
1078      {
1079        // Set it to auto if this is a new install.
1080        if(P.Status == 2)
1081          P.Flags |= Flag::Auto;
1082      }
1083    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1084       P.Mode = ModeKeep;
1085
1086    AddStates(Pkg);
1087    Update(Pkg);
1088    AddSizes(Pkg);
1089
1090    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1091       return true;
1092
1093    if (DebugMarker == true)
1094       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1095
1096    VerIterator const PV = P.InstVerIter(*this);
1097    if (unlikely(PV.end() == true))
1098       return false;
1099    bool const PinNeverMarkAutoSection = (PV->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", PV.Section()));
1100
1101    DepIterator Dep = PV.DependsList();
1102    for (; Dep.end() != true;)
1103    {
1104       // Grok or groups
1105       DepIterator Start = Dep;
1106       bool Result = true;
1107       unsigned Ors = 0;
1108       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1109       {
1110          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1111
1112          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1113             Result = false;
1114       }
1115
1116       // Dep is satisfied okay.
1117       if (Result == false)
1118          continue;
1119
1120       /* Check if this dep should be consider for install. If it is a user
1121          defined important dep and we are installed a new package then
1122          it will be installed. Otherwise we only check for important
1123          deps that have changed from the installed version */
1124       if (IsImportantDep(Start) == false)
1125          continue;
1126
1127       /* If we are in an or group locate the first or that can
1128          succeed. We have already cached this… */
1129       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1130          ++Start;
1131
1132       /* unsatisfiable dependency: IsInstallOkDependenciesSatisfiableByCandidates
1133          would have prevented us to get here if not overridden, so just skip
1134          over the problem here as the frontend will know what it is doing */
1135       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1136          continue;
1137
1138       /* Check if any ImportantDep() (but not Critical) were added
1139        * since we installed the package.  Also check for deps that
1140        * were satisfied in the past: for instance, if a version
1141        * restriction in a Recommends was tightened, upgrading the
1142        * package should follow that Recommends rather than causing the
1143        * dependency to be removed. (bug #470115)
1144        */
1145       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1146       {
1147          bool isNewImportantDep = true;
1148          bool isPreviouslySatisfiedImportantDep = false;
1149          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1150          {
1151             //FIXME: Should we handle or-group better here?
1152             // We do not check if the package we look for is part of the same or-group
1153             // we might find while searching, but could that really be a problem?
1154             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1155                 Start.TargetPkg() != D.TargetPkg())
1156                continue;
1157
1158             isNewImportantDep = false;
1159
1160             while ((D->CompareOp & Dep::Or) != 0)
1161                ++D;
1162
1163             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1164             if (isPreviouslySatisfiedImportantDep == true)
1165                break;
1166          }
1167
1168          if(isNewImportantDep == true)
1169          {
1170             if (DebugAutoInstall == true)
1171                std::clog << OutputInDepth(Depth) << "new important dependency: "
1172                          << Start.TargetPkg().FullName() << std::endl;
1173          }
1174          else if(isPreviouslySatisfiedImportantDep == true)
1175          {
1176             if (DebugAutoInstall == true)
1177                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1178                          << Start.TargetPkg().FullName() << std::endl;
1179          }
1180          else
1181          {
1182             if (DebugAutoInstall == true)
1183                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1184                          << Start.TargetPkg().FullName() << std::endl;
1185             continue;
1186          }
1187       }
1188
1189       /* This bit is for processing the possibility of an install/upgrade
1190          fixing the problem for "positive" dependencies */
1191       if (Start.IsNegative() == false && (DepState[Start->ID] & DepCVer) == DepCVer)
1192       {
1193          pkgCacheFile CacheFile(this);
1194          APT::VersionList verlist = APT::VersionList::FromDependency(CacheFile, Start, APT::CacheSetHelper::CANDIDATE);
1195          CompareProviders comp(Start);
1196
1197          do {
1198             APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1199
1200             if (InstVer == verlist.end())
1201                break;
1202
1203             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1204             if(DebugAutoInstall == true)
1205                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1206                          << " as " << Start.DepType() << " of " << Pkg.Name()
1207                          << std::endl;
1208             if (MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps) == false)
1209             {
1210                verlist.erase(InstVer);
1211                continue;
1212             }
1213             // now check if we should consider it a automatic dependency or not
1214             if(InstPkg->CurrentVer == 0 && PinNeverMarkAutoSection)
1215             {
1216                if(DebugAutoInstall == true)
1217                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1218                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1219                MarkAuto(InstPkg, false);
1220             }
1221             break;
1222          } while(true);
1223          continue;
1224       }
1225       /* Negative dependencies have no or-group
1226          If the dependency isn't versioned, we try if an upgrade might solve the problem.
1227          Otherwise we remove the offender if needed */
1228       else if (Start.IsNegative() == true && Start->Type != pkgCache::Dep::Obsoletes)
1229       {
1230          SPtrArray<Version *> List = Start.AllTargets();
1231          pkgCache::PkgIterator TrgPkg = Start.TargetPkg();
1232          for (Version **I = List; *I != 0; I++)
1233          {
1234             VerIterator Ver(*this,*I);
1235             PkgIterator Pkg = Ver.ParentPkg();
1236
1237             /* The List includes all packages providing this dependency,
1238                even providers which are not installed, so skip them. */
1239             if (PkgState[Pkg->ID].InstallVer == 0)
1240                continue;
1241
1242             /* Ignore negative dependencies that we are not going to
1243                get installed */
1244             if (PkgState[Pkg->ID].InstallVer != *I)
1245                continue;
1246
1247             if ((Start->Version != 0 || TrgPkg != Pkg) &&
1248                 PkgState[Pkg->ID].CandidateVer != PkgState[Pkg->ID].InstallVer &&
1249                 PkgState[Pkg->ID].CandidateVer != *I &&
1250                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1251                continue;
1252             else if (Start->Type == pkgCache::Dep::Conflicts ||
1253                      Start->Type == pkgCache::Dep::DpkgBreaks)
1254             {
1255                if(DebugAutoInstall == true)
1256                   std::clog << OutputInDepth(Depth)
1257                             << " Removing: " << Pkg.Name()
1258                             << std::endl;
1259                if (MarkDelete(Pkg,false,Depth + 1, false) == false)
1260                   break;
1261             }
1262          }
1263          continue;
1264       }
1265    }
1266
1267    return Dep.end() == true;
1268 }
1269                                                                         /*}}}*/
1270 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1271 // ---------------------------------------------------------------------
1272 /* The default implementation checks if the installation of an M-A:same
1273    package would lead us into a version-screw and if so forbids it.
1274    dpkg holds are enforced by the private IsModeChangeOk */
1275 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1276                               unsigned long Depth, bool FromUser)
1277 {
1278    return IsInstallOkMultiArchSameVersionSynced(Pkg,AutoInst, Depth, FromUser) &&
1279       IsInstallOkDependenciesSatisfiableByCandidates(Pkg,AutoInst, Depth, FromUser);
1280 }
1281 bool pkgDepCache::IsInstallOkMultiArchSameVersionSynced(PkgIterator const &Pkg,
1282       bool const /*AutoInst*/, unsigned long const Depth, bool const FromUser)
1283 {
1284    if (FromUser == true) // as always: user is always right
1285       return true;
1286
1287    // if we have checked before and it was okay, it will still be okay
1288    if (PkgState[Pkg->ID].Mode == ModeInstall &&
1289          PkgState[Pkg->ID].InstallVer == PkgState[Pkg->ID].CandidateVer)
1290       return true;
1291
1292    // ignore packages with none-M-A:same candidates
1293    VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
1294    if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer() ||
1295          (CandVer->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1296       return true;
1297
1298    GrpIterator const Grp = Pkg.Group();
1299    for (PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1300    {
1301       // not installed or self-check: fine by definition
1302       if (P->CurrentVer == 0 || P == Pkg)
1303          continue;
1304
1305       // not having a candidate or being in sync
1306       // (simple string-compare as stuff like '1' == '0:1-0' can't happen here)
1307       VerIterator CV = PkgState[P->ID].CandidateVerIter(*this);
1308       if (CV.end() == true || strcmp(Pkg.CandVersion(), CV.VerStr()) == 0)
1309          continue;
1310
1311       // packages losing M-A:same can be out-of-sync
1312       if ((CV->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1313          continue;
1314
1315       // not downloadable means the package is obsolete, so allow out-of-sync
1316       if (CV.Downloadable() == false)
1317          continue;
1318
1319       PkgState[Pkg->ID].iFlags |= AutoKept;
1320       if (unlikely(DebugMarker == true))
1321          std::clog << OutputInDepth(Depth) << "Ignore MarkInstall of " << Pkg
1322             << " as it is not in sync with its M-A:same sibling " << P
1323             << " (" << Pkg.CandVersion() << " != " << CV.VerStr() << ")" << std::endl;
1324       return false;
1325    }
1326
1327    return true;
1328 }
1329 bool pkgDepCache::IsInstallOkDependenciesSatisfiableByCandidates(PkgIterator const &Pkg,
1330       bool const AutoInst, unsigned long const Depth, bool const /*FromUser*/)
1331 {
1332    if (AutoInst == false)
1333       return true;
1334
1335    VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
1336    if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer())
1337       return true;
1338
1339    for (DepIterator Dep = CandVer.DependsList(); Dep.end() != true;)
1340    {
1341       // Grok or groups
1342       DepIterator Start = Dep;
1343       bool Result = true;
1344       unsigned Ors = 0;
1345       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1346       {
1347          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1348
1349          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1350             Result = false;
1351       }
1352
1353       if (Start.IsCritical() == false || Start.IsNegative() == true || Result == false)
1354          continue;
1355
1356       /* If we are in an or group locate the first or that can succeed.
1357          We have already cached this… */
1358       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1359          ++Start;
1360
1361       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer)
1362       {
1363          if (DebugAutoInstall == true)
1364             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1365
1366          // the dependency is critical, but can't be installed, so discard the candidate
1367          // as the problemresolver will trip over it otherwise trying to install it (#735967)
1368          if (Pkg->CurrentVer != 0 && (PkgState[Pkg->ID].iFlags & Protected) != Protected)
1369             SetCandidateVersion(Pkg.CurrentVer());
1370          return false;
1371       }
1372    }
1373
1374    return true;
1375 }
1376                                                                         /*}}}*/
1377 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1378 // ---------------------------------------------------------------------
1379 /* */
1380 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1381 {
1382    if (unlikely(Pkg.end() == true))
1383       return;
1384
1385    APT::PackageList pkglist;
1386    if (Pkg->CurrentVer != 0 &&
1387        (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1388    {
1389       pkgCache::GrpIterator Grp = Pkg.Group();
1390       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1391       {
1392          if (P->CurrentVer != 0)
1393             pkglist.insert(P);
1394       }
1395    }
1396    else
1397       pkglist.insert(Pkg);
1398
1399    ActionGroup group(*this);
1400
1401    for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
1402    {
1403       RemoveSizes(Pkg);
1404       RemoveStates(Pkg);
1405
1406       StateCache &P = PkgState[Pkg->ID];
1407       if (To == true)
1408          P.iFlags |= ReInstall;
1409       else
1410          P.iFlags &= ~ReInstall;
1411
1412       AddStates(Pkg);
1413       AddSizes(Pkg);
1414    }
1415 }
1416                                                                         /*}}}*/
1417 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1418 // ---------------------------------------------------------------------
1419 /* */
1420 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1421 {
1422    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1423    StateCache &P = PkgState[Pkg->ID];
1424
1425    if (P.CandidateVer == TargetVer)
1426       return;
1427
1428    ActionGroup group(*this);
1429
1430    RemoveSizes(Pkg);
1431    RemoveStates(Pkg);
1432
1433    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1434       P.InstallVer = (Version *)TargetVer;
1435    P.CandidateVer = (Version *)TargetVer;
1436    P.Update(Pkg,*this);
1437
1438    AddStates(Pkg);
1439    Update(Pkg);
1440    AddSizes(Pkg);
1441
1442 }
1443                                                                         /*}}}*/
1444 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1445 // ---------------------------------------------------------------------
1446 /* changes the candidate of a package and walks over all its dependencies
1447    to check if it needs to change the candidate of the dependency, too,
1448    to reach a installable versionstate */
1449 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1450                                         std::string const &TargetRel)
1451 {
1452    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1453    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1454 }
1455 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1456                                         std::string const &TargetRel,
1457                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1458 {
1459    ActionGroup group(*this);
1460    SetCandidateVersion(TargetVer);
1461
1462    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1463       return true;
1464
1465    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1466    // save the position of the last element we will not undo - if we have to
1467    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1468
1469    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1470    {
1471       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1472           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1473            IsImportantDep(D) == false))
1474          continue;
1475
1476       // walk over an or-group and check if we need to do anything
1477       // for simpilicity no or-group is handled as a or-group including one dependency
1478       pkgCache::DepIterator Start = D;
1479       bool itsFine = false;
1480       for (bool stillOr = true; stillOr == true; ++Start)
1481       {
1482          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1483          pkgCache::PkgIterator const P = Start.TargetPkg();
1484          // virtual packages can't be a solution
1485          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1486             continue;
1487          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1488          // no versioned dependency - but is it installable?
1489          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1490          {
1491             // Check if one of the providers is installable
1492             if (P->ProvidesList != 0)
1493             {
1494                pkgCache::PrvIterator Prv = P.ProvidesList();
1495                for (; Prv.end() == false; ++Prv)
1496                {
1497                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1498                   if (C.end() == true || C != Prv.OwnerVer() ||
1499                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1500                      continue;
1501                   break;
1502                }
1503                if (Prv.end() == true)
1504                   continue;
1505             }
1506             // no providers, so check if we have an installable candidate version
1507             else if (Cand.end() == true ||
1508                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1509                continue;
1510             itsFine = true;
1511             break;
1512          }
1513          if (Cand.end() == true)
1514             continue;
1515          // check if the current candidate is enough for the versioned dependency - and installable?
1516          if (Start.IsSatisfied(Cand) == true &&
1517              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1518          {
1519             itsFine = true;
1520             break;
1521          }
1522       }
1523
1524       if (itsFine == true) {
1525          // something in the or-group was fine, skip all other members
1526          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1527          continue;
1528       }
1529
1530       // walk again over the or-group and check each if a candidate switch would help
1531       itsFine = false;
1532       for (bool stillOr = true; stillOr == true; ++D)
1533       {
1534          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1535          // changing candidate will not help if the dependency is not versioned
1536          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1537          {
1538             if (stillOr == true)
1539                continue;
1540             break;
1541          }
1542
1543          pkgCache::VerIterator V;
1544          if (TargetRel == "newest")
1545             V = D.TargetPkg().VersionList();
1546          else
1547             V = Match.Find(D.TargetPkg());
1548
1549          // check if the version from this release could satisfy the dependency
1550          if (V.end() == true || D.IsSatisfied(V) == false)
1551          {
1552             if (stillOr == true)
1553                continue;
1554             break;
1555          }
1556
1557          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1558          if (V == oldCand)
1559          {
1560             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1561             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1562                  c != Changed.end(); ++c)
1563             {
1564                if (c->first->ParentPkg != V->ParentPkg)
1565                   continue;
1566                itsFine = true;
1567                break;
1568             }
1569          }
1570
1571          if (itsFine == false)
1572          {
1573             // change the candidate
1574             Changed.push_back(make_pair(V, TargetVer));
1575             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1576             {
1577                if (stillOr == false)
1578                   break;
1579                // undo the candidate changing
1580                SetCandidateVersion(oldCand);
1581                Changed.pop_back();
1582                continue;
1583             }
1584             itsFine = true;
1585          }
1586
1587          // something in the or-group was fine, skip all other members
1588          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1589          break;
1590       }
1591
1592       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1593       {
1594          // undo all changes which aren't lead to a solution
1595          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1596               c != Changed.end(); ++c)
1597             SetCandidateVersion(c->first);
1598          Changed.erase(newChanged, Changed.end());
1599          return false;
1600       }
1601    }
1602    return true;
1603 }
1604                                                                         /*}}}*/
1605 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1606 // ---------------------------------------------------------------------
1607 /* */
1608 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1609 {
1610   StateCache &state = PkgState[Pkg->ID];
1611
1612   ActionGroup group(*this);
1613
1614   if(Auto)
1615     state.Flags |= Flag::Auto;
1616   else
1617     state.Flags &= ~Flag::Auto;
1618 }
1619                                                                         /*}}}*/
1620 // StateCache::Update - Compute the various static display things       /*{{{*/
1621 // ---------------------------------------------------------------------
1622 /* This is called whenever the Candidate version changes. */
1623 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1624 {
1625    // Some info
1626    VerIterator Ver = CandidateVerIter(Cache);
1627
1628    // Use a null string or the version string
1629    if (Ver.end() == true)
1630       CandVersion = "";
1631    else
1632       CandVersion = Ver.VerStr();
1633
1634    // Find the current version
1635    CurVersion = "";
1636    if (Pkg->CurrentVer != 0)
1637       CurVersion = Pkg.CurrentVer().VerStr();
1638
1639    // Strip off the epochs for display
1640    CurVersion = StripEpoch(CurVersion);
1641    CandVersion = StripEpoch(CandVersion);
1642
1643    // Figure out if its up or down or equal
1644    Status = Ver.CompareVer(Pkg.CurrentVer());
1645    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1646      Status = 2;
1647 }
1648                                                                         /*}}}*/
1649 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1650 // ---------------------------------------------------------------------
1651 /* */
1652 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1653 {
1654    if (Ver == 0)
1655       return 0;
1656
1657    // Strip any epoch
1658    char const * const I = strchr(Ver, ':');
1659    if (I == nullptr)
1660       return Ver;
1661    return I + 1;
1662 }
1663                                                                         /*}}}*/
1664 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1665 // ---------------------------------------------------------------------
1666 /* The default just returns the highest available version that is not
1667    a source and automatic. */
1668 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1669 {
1670    /* Not source/not automatic versions cannot be a candidate version
1671       unless they are already installed */
1672    VerIterator Last;
1673
1674    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1675    {
1676       if (Pkg.CurrentVer() == I)
1677          return I;
1678
1679       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1680       {
1681          if (J.File().Flagged(Flag::NotSource))
1682             continue;
1683
1684          /* Stash the highest version of a not-automatic source, we use it
1685             if there is nothing better */
1686          if (J.File().Flagged(Flag::NotAutomatic) ||
1687              J.File().Flagged(Flag::ButAutomaticUpgrades))
1688          {
1689             if (Last.end() == true)
1690                Last = I;
1691             continue;
1692          }
1693
1694          return I;
1695       }
1696    }
1697
1698    return Last;
1699 }
1700                                                                         /*}}}*/
1701 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1702 // ---------------------------------------------------------------------
1703 /* */
1704 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep) const
1705 {
1706    if(Dep.IsCritical())
1707       return true;
1708    else if(Dep->Type == pkgCache::Dep::Recommends)
1709    {
1710       if (InstallRecommends)
1711          return true;
1712       // we suport a special mode to only install-recommends for certain
1713       // sections
1714       // FIXME: this is a meant as a temporarly solution until the
1715       //        recommends are cleaned up
1716       const char *sec = Dep.ParentVer().Section();
1717       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1718          return true;
1719    }
1720    else if(Dep->Type == pkgCache::Dep::Suggests)
1721       return InstallSuggests;
1722
1723    return false;
1724 }
1725                                                                         /*}}}*/
1726 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1727 APT_CONST signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &/*Pkg*/)
1728 { return 0; }
1729 APT_CONST signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &/*File*/)
1730 { return 0; }
1731                                                                         /*}}}*/
1732 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1733 {
1734   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1735   if(f->wasConstructedSuccessfully())
1736     return f;
1737   else
1738     {
1739       delete f;
1740       return NULL;
1741     }
1742 }
1743                                                                         /*}}}*/
1744 bool pkgDepCache::MarkFollowsRecommends()
1745 {
1746   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1747 }
1748
1749 bool pkgDepCache::MarkFollowsSuggests()
1750 {
1751   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1752 }
1753
1754 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1755 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1756 {
1757    if (_config->Find("APT::Solver", "internal") != "internal")
1758       return true;
1759
1760    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1761
1762    // init the states
1763    map_id_t const PackagesCount = Head().PackageCount;
1764    for(map_id_t i = 0; i < PackagesCount; ++i)
1765    {
1766       PkgState[i].Marked  = false;
1767       PkgState[i].Garbage = false;
1768    }
1769    if (debug_autoremove)
1770       for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1771          if(PkgState[p->ID].Flags & Flag::Auto)
1772             std::clog << "AutoDep: " << p.FullName() << std::endl;
1773
1774    bool const follow_recommends = MarkFollowsRecommends();
1775    bool const follow_suggests   = MarkFollowsSuggests();
1776
1777    // do the mark part, this is the core bit of the algorithm
1778    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1779    {
1780       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1781           (p->Flags & Flag::Essential) ||
1782           (p->Flags & Flag::Important) ||
1783           userFunc.InRootSet(p) ||
1784           // be nice even then a required package violates the policy (#583517)
1785           // and do the full mark process also for required packages
1786           (p.CurrentVer().end() != true &&
1787            p.CurrentVer()->Priority == pkgCache::State::Required) ||
1788           // packages which can't be changed (like holds) can't be garbage
1789           (IsModeChangeOk(ModeGarbage, p, 0, false) == false))
1790       {
1791          // the package is installed (and set to keep)
1792          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1793             MarkPackage(p, p.CurrentVer(),
1794                         follow_recommends, follow_suggests);
1795          // the package is to be installed
1796          else if(PkgState[p->ID].Install())
1797             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1798                         follow_recommends, follow_suggests);
1799       }
1800    }
1801
1802    return true;
1803 }
1804                                                                         /*}}}*/
1805 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1806 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1807                               const pkgCache::VerIterator &ver,
1808                               bool const &follow_recommends,
1809                               bool const &follow_suggests)
1810 {
1811    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1812
1813    // if we are marked already we are done
1814    if(state.Marked)
1815       return;
1816
1817    VerIterator const currver = pkg.CurrentVer();
1818    VerIterator const instver = state.InstVerIter(*this);
1819
1820 #if 0
1821    VerIterator const candver = state.CandidateVerIter(*this);
1822
1823    // If a package was garbage-collected but is now being marked, we
1824    // should re-select it
1825    // For cases when a pkg is set to upgrade and this trigger the
1826    // removal of a no-longer used dependency.  if the pkg is set to
1827    // keep again later it will result in broken deps
1828    if(state.Delete() && state.RemoveReason = Unused)
1829    {
1830       if(ver==candver)
1831          mark_install(pkg, false, false, NULL);
1832       else if(ver==pkg.CurrentVer())
1833          MarkKeep(pkg, false, false);
1834
1835       instver=state.InstVerIter(*this);
1836    }
1837 #endif
1838
1839    // For packages that are not going to be removed, ignore versions
1840    // other than the InstVer.  For packages that are going to be
1841    // removed, ignore versions other than the current version.
1842    if(!(ver == instver && !instver.end()) &&
1843       !(ver == currver && instver.end() && !ver.end()))
1844       return;
1845
1846    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1847
1848    if(debug_autoremove)
1849      {
1850        std::clog << "Marking: " << pkg.FullName();
1851        if(!ver.end())
1852          std::clog << " " << ver.VerStr();
1853        if(!currver.end())
1854          std::clog << ", Curr=" << currver.VerStr();
1855        if(!instver.end())
1856          std::clog << ", Inst=" << instver.VerStr();
1857        std::clog << std::endl;
1858      }
1859
1860    state.Marked=true;
1861
1862    if(ver.end() == true)
1863       return;
1864
1865      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1866      {
1867         if(d->Type == Dep::Depends ||
1868            d->Type == Dep::PreDepends ||
1869            (follow_recommends &&
1870             d->Type == Dep::Recommends) ||
1871            (follow_suggests &&
1872             d->Type == Dep::Suggests))
1873         {
1874            // Try all versions of this package.
1875            for(VerIterator V = d.TargetPkg().VersionList();
1876                !V.end(); ++V)
1877            {
1878               if(d.IsSatisfied(V))
1879               {
1880                 if(debug_autoremove)
1881                   {
1882                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1883                               << " " << d.ParentVer().VerStr() << " "
1884                               << d.DepType() << " " << d.TargetPkg().FullName();
1885                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1886                       {
1887                         std::clog << " (" << d.CompType() << " "
1888                                   << d.TargetVer() << ")";
1889                       }
1890                     std::clog << std::endl;
1891                   }
1892                  MarkPackage(V.ParentPkg(), V,
1893                              follow_recommends, follow_suggests);
1894               }
1895            }
1896            // Now try virtual packages
1897            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1898                !prv.end(); ++prv)
1899            {
1900               if(d.IsSatisfied(prv))
1901               {
1902                 if(debug_autoremove)
1903                   {
1904                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1905                               << d.ParentVer().VerStr() << " "
1906                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1907                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1908                       {
1909                         std::clog << " (" << d.CompType() << " "
1910                                   << d.TargetVer() << ")";
1911                       }
1912                     std::clog << ", provided by "
1913                               << prv.OwnerPkg().FullName() << " "
1914                               << prv.OwnerVer().VerStr()
1915                               << std::endl;
1916                   }
1917
1918                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1919                              follow_recommends, follow_suggests);
1920               }
1921            }
1922         }
1923      }
1924 }
1925                                                                         /*}}}*/
1926 bool pkgDepCache::Sweep()                                               /*{{{*/
1927 {
1928    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1929
1930    // do the sweep
1931    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1932    {
1933      StateCache &state=PkgState[p->ID];
1934
1935      // skip required packages
1936      if (!p.CurrentVer().end() &&
1937          (p.CurrentVer()->Priority == pkgCache::State::Required))
1938         continue;
1939
1940      // if it is not marked and it is installed, it's garbage
1941      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1942      {
1943         state.Garbage=true;
1944         if(debug_autoremove)
1945            std::clog << "Garbage: " << p.FullName() << std::endl;
1946      }
1947   }
1948
1949    return true;
1950 }
1951                                                                         /*}}}*/
1952 // DepCache::MarkAndSweep                                               /*{{{*/
1953 bool pkgDepCache::MarkAndSweep(InRootSetFunc &rootFunc)
1954 {
1955    return MarkRequired(rootFunc) && Sweep();
1956 }
1957 bool pkgDepCache::MarkAndSweep()
1958 {
1959    std::auto_ptr<InRootSetFunc> f(GetRootSetFunc());
1960    if(f.get() != NULL)
1961       return MarkAndSweep(*f.get());
1962    else
1963       return false;
1964 }
1965                                                                         /*}}}*/