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 (FromUser == false)
 840    {
 841       VerIterator const PV = P.InstVerIter(*this);
 842       if (PV.end() == false)
 843       {
 844          // removed metapackages mark their dependencies as manual to prevent in "desktop depends browser, texteditor"
 845          // the removal of browser to suggest the removal of desktop and texteditor.
 846          // We ignore the auto-bit here as we can't deal with metapackage cascardes otherwise.
 847          // We do not check for or-groups here as we don't know which package takes care of
 848          // providing the feature the user likes e.g.:  browser1 | browser2 | browser3
 849          // Temporary removals are effected by this as well, which is bad, but unlikely in practice
 850          bool const PinNeverMarkAutoSection = (PV->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", PV.Section()));
 851          if (PinNeverMarkAutoSection)
 852          {
 853             for (DepIterator D = PV.DependsList(); D.end() != true; ++D)
 854             {
 855                if (D.IsMultiArchImplicit() == true || D.IsNegative() == true || IsImportantDep(D) == false)
 856                   continue;
 857
 858                pkgCacheFile CacheFile(this);
 859                APT::VersionList verlist = APT::VersionList::FromDependency(CacheFile, D, APT::CacheSetHelper::INSTALLED);
 860                for (auto const &V : verlist)
 861                {
 862                   PkgIterator const DP = V.ParentPkg();
 863                   if(DebugAutoInstall == true)
 864                      std::clog << OutputInDepth(Depth) << "Setting " << DP.FullName(false) << " NOT as auto-installed (direct "
 865                         << D.DepType() << " of " << Pkg.FullName(false) << " which is in APT::Never-MarkAuto-Sections)" << std::endl;
 866
 867                   MarkAuto(DP, false);
 868                }
 869             }
 870          }
 871       }
 872    }
 873
 874    if (DebugMarker == true)
 875       std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << Pkg << " FU=" << FromUser << std::endl;
 876
 877    RemoveSizes(Pkg);
 878    RemoveStates(Pkg);
 879
 880    if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
 881       P.Mode = ModeKeep;
 882    else
 883       P.Mode = ModeDelete;
 884    P.InstallVer = 0;
 885
 886    AddStates(Pkg);
 887    Update(Pkg);
 888    AddSizes(Pkg);
 889
 890    return true;
 891 }
 892                                                                         /*}}}*/
 893 // DepCache::IsDeleteOk - check if it is ok to remove this package      /*{{{*/
 894 // ---------------------------------------------------------------------
 895 /* The default implementation tries to prevent deletion of install requests.
 896    dpkg holds are enforced by the private IsModeChangeOk */
 897 bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
 898                               unsigned long Depth, bool FromUser)
 899 {
 900    return IsDeleteOkProtectInstallRequests(Pkg, rPurge, Depth, FromUser);
 901 }
 902 bool pkgDepCache::IsDeleteOkProtectInstallRequests(PkgIterator const &Pkg,
 903       bool const /*rPurge*/, unsigned long const Depth, bool const FromUser)
 904 {
 905    if (FromUser == false && Pkg->CurrentVer == 0)
 906    {
 907       StateCache &P = PkgState[Pkg->ID];
 908       if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
 909       {
 910          if (DebugMarker == true)
 911             std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << Pkg << std::endl;
 912          return false;
 913       }
 914    }
 915    return true;
 916 }
 917                                                                         /*}}}*/
 918 // DepCache::IsModeChangeOk - check if it is ok to change the mode      /*{{{*/
 919 // ---------------------------------------------------------------------
 920 /* this is used by all Mark methods on the very first line to check sanity
 921    and prevents mode changes for packages on hold for example.
 922    If you want to check Mode specific stuff you can use the virtual public
 923    Is<Mode>Ok methods instead */
 924 static char const* PrintMode(char const mode)
 925 {
 926          switch (mode)
 927          {
 928          case pkgDepCache::ModeInstall: return "Install";
 929          case pkgDepCache::ModeKeep: return "Keep";
 930          case pkgDepCache::ModeDelete: return "Delete";
 931          case pkgDepCache::ModeGarbage: return "Garbage";
 932          default: return "UNKNOWN";
 933          }
 934 }
 935 bool pkgDepCache::IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg,
 936                                  unsigned long const Depth, bool const FromUser)
 937 {
 938    // we are not trying to hard…
 939    if (unlikely(Depth > 100))
 940       return false;
 941
 942    // general sanity
 943    if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
 944       return false;
 945
 946    // the user is always right
 947    if (FromUser == true)
 948       return true;
 949
 950    StateCache &P = PkgState[Pkg->ID];
 951    // not changing the mode is obviously also fine as we might want to call
 952    // e.g. MarkInstall multiple times with different arguments for the same package
 953    if (P.Mode == mode)
 954       return true;
 955
 956    // if previous state was set by user only user can reset it
 957    if ((P.iFlags & Protected) == Protected)
 958    {
 959       if (unlikely(DebugMarker == true))
 960          std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
 961                    << " of " << Pkg << " as its mode (" << PrintMode(P.Mode)
 962                    << ") is protected" << std::endl;
 963       return false;
 964    }
 965    // enforce dpkg holds
 966    else if (mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 967             _config->FindB("APT::Ignore-Hold",false) == false)
 968    {
 969       if (unlikely(DebugMarker == true))
 970          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 971                    << " of " << Pkg << std::endl;
 972       return false;
 973    }
 974
 975    return true;
 976 }
 977                                                                         /*}}}*/
 978 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 979 // ---------------------------------------------------------------------
 980 /* */
 981 struct CompareProviders {
 982    pkgCache::PkgIterator const Pkg;
 983    explicit CompareProviders(pkgCache::DepIterator const &Dep) : Pkg(Dep.TargetPkg()) {};
 984    //bool operator() (APT::VersionList::iterator const &AV, APT::VersionList::iterator const &BV)
 985    bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
 986    {
 987       pkgCache::PkgIterator const A = AV.ParentPkg();
 988       pkgCache::PkgIterator const B = BV.ParentPkg();
 989       // Prefer MA:same packages if other architectures for it are installed
 990       if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same ||
 991           (BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 992       {
 993          bool instA = false;
 994          if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 995          {
 996             pkgCache::GrpIterator Grp = A.Group();
 997             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 998                if (P->CurrentVer != 0)
 999                {
1000                   instA = true;
1001                   break;
1002                }
1003          }
1004          bool instB = false;
1005          if ((BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1006          {
1007             pkgCache::GrpIterator Grp = B.Group();
1008             for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1009             {
1010                if (P->CurrentVer != 0)
1011                {
1012                   instB = true;
1013                   break;
1014                }
1015             }
1016          }
1017          if (instA != instB)
1018             return instA == false;
1019       }
1020       // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
1021       if (A->Group != B->Group)
1022       {
1023          if (A->Group == Pkg->Group && B->Group != Pkg->Group)
1024             return false;
1025          else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
1026             return true;
1027       }
1028       // we like essentials
1029       if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
1030       {
1031          if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
1032             return false;
1033          else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
1034             return true;
1035       }
1036       if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
1037       {
1038          if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1039             return false;
1040          else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
1041             return true;
1042       }
1043       // prefer native architecture
1044       if (strcmp(A.Arch(), B.Arch()) != 0)
1045       {
1046          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
1047             return false;
1048          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
1049             return true;
1050          std::vector<std::string> archs = APT::Configuration::getArchitectures();
1051          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
1052             if (*a == A.Arch())
1053                return false;
1054             else if (*a == B.Arch())
1055                return true;
1056       }
1057       // higher priority seems like a good idea
1058       if (AV->Priority != BV->Priority)
1059          return AV->Priority > BV->Priority;
1060       // unable to decide…
1061       return A->ID < B->ID;
1062    }
1063 };
1064 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
1065                               unsigned long Depth, bool FromUser,
1066                               bool ForceImportantDeps)
1067 {
1068    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
1069       return false;
1070
1071    StateCache &P = PkgState[Pkg->ID];
1072
1073    // See if there is even any possible instalation candidate
1074    if (P.CandidateVer == 0)
1075       return false;
1076
1077    /* Check that it is not already marked for install and that it can be
1078       installed */
1079    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1080        (P.Mode == ModeInstall ||
1081         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1082    {
1083       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1084          return MarkKeep(Pkg, false, FromUser, Depth+1);
1085       return true;
1086    }
1087
1088    // check if we are allowed to install the package
1089    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1090       return false;
1091
1092    ActionGroup group(*this);
1093    P.iFlags &= ~AutoKept;
1094
1095    /* Target the candidate version and remove the autoflag. We reset the
1096       autoflag below if this was called recursively. Otherwise the user
1097       should have the ability to de-auto a package by changing its state */
1098    RemoveSizes(Pkg);
1099    RemoveStates(Pkg);
1100
1101    P.Mode = ModeInstall;
1102    P.InstallVer = P.CandidateVer;
1103
1104    if(FromUser)
1105      {
1106        // Set it to manual if it's a new install or already installed,
1107        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1108        // or if we do automatic installation (aptitude never does it)
1109        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1110          P.Flags &= ~Flag::Auto;
1111      }
1112    else
1113      {
1114        // Set it to auto if this is a new install.
1115        if(P.Status == 2)
1116          P.Flags |= Flag::Auto;
1117      }
1118    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1119       P.Mode = ModeKeep;
1120
1121    AddStates(Pkg);
1122    Update(Pkg);
1123    AddSizes(Pkg);
1124
1125    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1126       return true;
1127
1128    if (DebugMarker == true)
1129       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1130
1131    bool MoveAutoBitToDependencies = false;
1132    VerIterator const PV = P.InstVerIter(*this);
1133    if (unlikely(PV.end() == true))
1134       return false;
1135    else if (PV->Section != 0 && (P.Flags & Flag::Auto) != Flag::Auto)
1136    {
1137       VerIterator const CurVer = Pkg.CurrentVer();
1138       if (CurVer.end() == false && CurVer->Section != 0 && strcmp(CurVer.Section(), PV.Section()) != 0)
1139       {
1140          bool const CurVerInMoveSection = ConfigValueInSubTree("APT::Move-Autobit-Sections", CurVer.Section());
1141          bool const InstVerInMoveSection = ConfigValueInSubTree("APT::Move-Autobit-Sections", PV.Section());
1142          MoveAutoBitToDependencies = (CurVerInMoveSection == false && InstVerInMoveSection == true);
1143          if (MoveAutoBitToDependencies == true)
1144          {
1145             if(DebugAutoInstall == true)
1146                std::clog << OutputInDepth(Depth) << "Setting " << Pkg.FullName(false) << " as auto-installed, moving manual to its dependencies" << std::endl;
1147             MarkAuto(Pkg, true);
1148          }
1149       }
1150    }
1151
1152    DepIterator Dep = PV.DependsList();
1153    for (; Dep.end() != true;)
1154    {
1155       // Grok or groups
1156       DepIterator Start = Dep;
1157       bool Result = true;
1158       unsigned Ors = 0;
1159       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1160       {
1161          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1162
1163          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1164             Result = false;
1165       }
1166
1167       // Dep is satisfied okay.
1168       if (Result == false)
1169          continue;
1170
1171       /* Check if this dep should be consider for install. If it is a user
1172          defined important dep and we are installed a new package then
1173          it will be installed. Otherwise we only check for important
1174          deps that have changed from the installed version */
1175       if (IsImportantDep(Start) == false)
1176          continue;
1177
1178       /* If we are in an or group locate the first or that can
1179          succeed. We have already cached this… */
1180       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1181          ++Start;
1182
1183       /* unsatisfiable dependency: IsInstallOkDependenciesSatisfiableByCandidates
1184          would have prevented us to get here if not overridden, so just skip
1185          over the problem here as the frontend will know what it is doing */
1186       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1187          continue;
1188
1189       /* Check if any ImportantDep() (but not Critical) were added
1190        * since we installed the package.  Also check for deps that
1191        * were satisfied in the past: for instance, if a version
1192        * restriction in a Recommends was tightened, upgrading the
1193        * package should follow that Recommends rather than causing the
1194        * dependency to be removed. (bug #470115)
1195        */
1196       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1197       {
1198          bool isNewImportantDep = true;
1199          bool isPreviouslySatisfiedImportantDep = false;
1200          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1201          {
1202             //FIXME: Should we handle or-group better here?
1203             // We do not check if the package we look for is part of the same or-group
1204             // we might find while searching, but could that really be a problem?
1205             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1206                 Start.TargetPkg() != D.TargetPkg())
1207                continue;
1208
1209             isNewImportantDep = false;
1210
1211             while ((D->CompareOp & Dep::Or) != 0)
1212                ++D;
1213
1214             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1215             if (isPreviouslySatisfiedImportantDep == true)
1216                break;
1217          }
1218
1219          if(isNewImportantDep == true)
1220          {
1221             if (DebugAutoInstall == true)
1222                std::clog << OutputInDepth(Depth) << "new important dependency: "
1223                          << Start.TargetPkg().FullName() << std::endl;
1224          }
1225          else if(isPreviouslySatisfiedImportantDep == true)
1226          {
1227             if (DebugAutoInstall == true)
1228                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1229                          << Start.TargetPkg().FullName() << std::endl;
1230          }
1231          else
1232          {
1233             if (DebugAutoInstall == true)
1234                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1235                          << Start.TargetPkg().FullName() << std::endl;
1236             continue;
1237          }
1238       }
1239
1240       /* This bit is for processing the possibility of an install/upgrade
1241          fixing the problem for "positive" dependencies */
1242       if (Start.IsNegative() == false && (DepState[Start->ID] & DepCVer) == DepCVer)
1243       {
1244          pkgCacheFile CacheFile(this);
1245          APT::VersionList verlist = APT::VersionList::FromDependency(CacheFile, Start, APT::CacheSetHelper::CANDIDATE);
1246          CompareProviders comp(Start);
1247
1248          do {
1249             APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1250
1251             if (InstVer == verlist.end())
1252                break;
1253
1254             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1255             if(DebugAutoInstall == true)
1256                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1257                          << " as " << Start.DepType() << " of " << Pkg.Name()
1258                          << std::endl;
1259             if (MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps) == false)
1260             {
1261                verlist.erase(InstVer);
1262                continue;
1263             }
1264
1265             // now check if we should consider it a automatic dependency or not
1266             if(InstPkg->CurrentVer == 0 && MoveAutoBitToDependencies)
1267             {
1268                if(DebugAutoInstall == true)
1269                   std::clog << OutputInDepth(Depth) << "Setting " << InstPkg.FullName(false) << " NOT as auto-installed (direct "
1270                      << Start.DepType() << " of " << Pkg.FullName(false) << " which is manual and in APT::Move-Autobit-Sections)" << std::endl;
1271                MarkAuto(InstPkg, false);
1272             }
1273
1274
1275             break;
1276          } while(true);
1277          continue;
1278       }
1279       /* Negative dependencies have no or-group
1280          If the dependency isn't versioned, we try if an upgrade might solve the problem.
1281          Otherwise we remove the offender if needed */
1282       else if (Start.IsNegative() == true && Start->Type != pkgCache::Dep::Obsoletes)
1283       {
1284          SPtrArray<Version *> List = Start.AllTargets();
1285          pkgCache::PkgIterator TrgPkg = Start.TargetPkg();
1286          for (Version **I = List; *I != 0; I++)
1287          {
1288             VerIterator Ver(*this,*I);
1289             PkgIterator Pkg = Ver.ParentPkg();
1290
1291             /* The List includes all packages providing this dependency,
1292                even providers which are not installed, so skip them. */
1293             if (PkgState[Pkg->ID].InstallVer == 0)
1294                continue;
1295
1296             /* Ignore negative dependencies that we are not going to
1297                get installed */
1298             if (PkgState[Pkg->ID].InstallVer != *I)
1299                continue;
1300
1301             if ((Start->Version != 0 || TrgPkg != Pkg) &&
1302                 PkgState[Pkg->ID].CandidateVer != PkgState[Pkg->ID].InstallVer &&
1303                 PkgState[Pkg->ID].CandidateVer != *I &&
1304                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1305                continue;
1306             else if (Start->Type == pkgCache::Dep::Conflicts ||
1307                      Start->Type == pkgCache::Dep::DpkgBreaks)
1308             {
1309                if(DebugAutoInstall == true)
1310                   std::clog << OutputInDepth(Depth)
1311                             << " Removing: " << Pkg.Name()
1312                             << std::endl;
1313                if (MarkDelete(Pkg,false,Depth + 1, false) == false)
1314                   break;
1315             }
1316          }
1317          continue;
1318       }
1319    }
1320
1321    return Dep.end() == true;
1322 }
1323                                                                         /*}}}*/
1324 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1325 // ---------------------------------------------------------------------
1326 /* The default implementation checks if the installation of an M-A:same
1327    package would lead us into a version-screw and if so forbids it.
1328    dpkg holds are enforced by the private IsModeChangeOk */
1329 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1330                               unsigned long Depth, bool FromUser)
1331 {
1332    return IsInstallOkMultiArchSameVersionSynced(Pkg,AutoInst, Depth, FromUser) &&
1333       IsInstallOkDependenciesSatisfiableByCandidates(Pkg,AutoInst, Depth, FromUser);
1334 }
1335 bool pkgDepCache::IsInstallOkMultiArchSameVersionSynced(PkgIterator const &Pkg,
1336       bool const /*AutoInst*/, unsigned long const Depth, bool const FromUser)
1337 {
1338    if (FromUser == true) // as always: user is always right
1339       return true;
1340
1341    // if we have checked before and it was okay, it will still be okay
1342    if (PkgState[Pkg->ID].Mode == ModeInstall &&
1343          PkgState[Pkg->ID].InstallVer == PkgState[Pkg->ID].CandidateVer)
1344       return true;
1345
1346    // ignore packages with none-M-A:same candidates
1347    VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
1348    if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer() ||
1349          (CandVer->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1350       return true;
1351
1352    GrpIterator const Grp = Pkg.Group();
1353    for (PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1354    {
1355       // not installed or self-check: fine by definition
1356       if (P->CurrentVer == 0 || P == Pkg)
1357          continue;
1358
1359       // not having a candidate or being in sync
1360       // (simple string-compare as stuff like '1' == '0:1-0' can't happen here)
1361       VerIterator CV = PkgState[P->ID].CandidateVerIter(*this);
1362       if (CV.end() == true || strcmp(Pkg.CandVersion(), CV.VerStr()) == 0)
1363          continue;
1364
1365       // packages losing M-A:same can be out-of-sync
1366       if ((CV->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
1367          continue;
1368
1369       // not downloadable means the package is obsolete, so allow out-of-sync
1370       if (CV.Downloadable() == false)
1371          continue;
1372
1373       PkgState[Pkg->ID].iFlags |= AutoKept;
1374       if (unlikely(DebugMarker == true))
1375          std::clog << OutputInDepth(Depth) << "Ignore MarkInstall of " << Pkg
1376             << " as it is not in sync with its M-A:same sibling " << P
1377             << " (" << Pkg.CandVersion() << " != " << CV.VerStr() << ")" << std::endl;
1378       return false;
1379    }
1380
1381    return true;
1382 }
1383 bool pkgDepCache::IsInstallOkDependenciesSatisfiableByCandidates(PkgIterator const &Pkg,
1384       bool const AutoInst, unsigned long const Depth, bool const /*FromUser*/)
1385 {
1386    if (AutoInst == false)
1387       return true;
1388
1389    VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
1390    if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer())
1391       return true;
1392
1393    for (DepIterator Dep = CandVer.DependsList(); Dep.end() != true;)
1394    {
1395       // Grok or groups
1396       DepIterator Start = Dep;
1397       bool Result = true;
1398       unsigned Ors = 0;
1399       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1400       {
1401          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1402
1403          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1404             Result = false;
1405       }
1406
1407       if (Start.IsCritical() == false || Start.IsNegative() == true || Result == false)
1408          continue;
1409
1410       /* If we are in an or group locate the first or that can succeed.
1411          We have already cached this… */
1412       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1413          ++Start;
1414
1415       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer)
1416       {
1417          if (DebugAutoInstall == true)
1418             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1419
1420          // the dependency is critical, but can't be installed, so discard the candidate
1421          // as the problemresolver will trip over it otherwise trying to install it (#735967)
1422          if (Pkg->CurrentVer != 0 && (PkgState[Pkg->ID].iFlags & Protected) != Protected)
1423             SetCandidateVersion(Pkg.CurrentVer());
1424          return false;
1425       }
1426    }
1427
1428    return true;
1429 }
1430                                                                         /*}}}*/
1431 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1432 // ---------------------------------------------------------------------
1433 /* */
1434 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1435 {
1436    if (unlikely(Pkg.end() == true))
1437       return;
1438
1439    APT::PackageList pkglist;
1440    if (Pkg->CurrentVer != 0 &&
1441        (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1442    {
1443       pkgCache::GrpIterator Grp = Pkg.Group();
1444       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1445       {
1446          if (P->CurrentVer != 0)
1447             pkglist.insert(P);
1448       }
1449    }
1450    else
1451       pkglist.insert(Pkg);
1452
1453    ActionGroup group(*this);
1454
1455    for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
1456    {
1457       RemoveSizes(Pkg);
1458       RemoveStates(Pkg);
1459
1460       StateCache &P = PkgState[Pkg->ID];
1461       if (To == true)
1462          P.iFlags |= ReInstall;
1463       else
1464          P.iFlags &= ~ReInstall;
1465
1466       AddStates(Pkg);
1467       AddSizes(Pkg);
1468    }
1469 }
1470                                                                         /*}}}*/
1471 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1472 // ---------------------------------------------------------------------
1473 /* */
1474 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1475 {
1476    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1477    StateCache &P = PkgState[Pkg->ID];
1478
1479    if (P.CandidateVer == TargetVer)
1480       return;
1481
1482    ActionGroup group(*this);
1483
1484    RemoveSizes(Pkg);
1485    RemoveStates(Pkg);
1486
1487    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1488       P.InstallVer = (Version *)TargetVer;
1489    P.CandidateVer = (Version *)TargetVer;
1490    P.Update(Pkg,*this);
1491
1492    AddStates(Pkg);
1493    Update(Pkg);
1494    AddSizes(Pkg);
1495
1496 }
1497                                                                         /*}}}*/
1498 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1499 // ---------------------------------------------------------------------
1500 /* changes the candidate of a package and walks over all its dependencies
1501    to check if it needs to change the candidate of the dependency, too,
1502    to reach a installable versionstate */
1503 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1504                                         std::string const &TargetRel)
1505 {
1506    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1507    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1508 }
1509 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1510                                         std::string const &TargetRel,
1511                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1512 {
1513    ActionGroup group(*this);
1514    SetCandidateVersion(TargetVer);
1515
1516    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1517       return true;
1518
1519    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1520    // save the position of the last element we will not undo - if we have to
1521    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1522
1523    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1524    {
1525       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1526           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1527            IsImportantDep(D) == false))
1528          continue;
1529
1530       // walk over an or-group and check if we need to do anything
1531       // for simpilicity no or-group is handled as a or-group including one dependency
1532       pkgCache::DepIterator Start = D;
1533       bool itsFine = false;
1534       for (bool stillOr = true; stillOr == true; ++Start)
1535       {
1536          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1537          pkgCache::PkgIterator const P = Start.TargetPkg();
1538          // virtual packages can't be a solution
1539          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1540             continue;
1541          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1542          // no versioned dependency - but is it installable?
1543          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1544          {
1545             // Check if one of the providers is installable
1546             if (P->ProvidesList != 0)
1547             {
1548                pkgCache::PrvIterator Prv = P.ProvidesList();
1549                for (; Prv.end() == false; ++Prv)
1550                {
1551                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1552                   if (C.end() == true || C != Prv.OwnerVer() ||
1553                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1554                      continue;
1555                   break;
1556                }
1557                if (Prv.end() == true)
1558                   continue;
1559             }
1560             // no providers, so check if we have an installable candidate version
1561             else if (Cand.end() == true ||
1562                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1563                continue;
1564             itsFine = true;
1565             break;
1566          }
1567          if (Cand.end() == true)
1568             continue;
1569          // check if the current candidate is enough for the versioned dependency - and installable?
1570          if (Start.IsSatisfied(Cand) == true &&
1571              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1572          {
1573             itsFine = true;
1574             break;
1575          }
1576       }
1577
1578       if (itsFine == true) {
1579          // something in the or-group was fine, skip all other members
1580          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1581          continue;
1582       }
1583
1584       // walk again over the or-group and check each if a candidate switch would help
1585       itsFine = false;
1586       for (bool stillOr = true; stillOr == true; ++D)
1587       {
1588          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1589          // changing candidate will not help if the dependency is not versioned
1590          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1591          {
1592             if (stillOr == true)
1593                continue;
1594             break;
1595          }
1596
1597          pkgCache::VerIterator V;
1598          if (TargetRel == "newest")
1599             V = D.TargetPkg().VersionList();
1600          else
1601             V = Match.Find(D.TargetPkg());
1602
1603          // check if the version from this release could satisfy the dependency
1604          if (V.end() == true || D.IsSatisfied(V) == false)
1605          {
1606             if (stillOr == true)
1607                continue;
1608             break;
1609          }
1610
1611          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1612          if (V == oldCand)
1613          {
1614             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1615             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1616                  c != Changed.end(); ++c)
1617             {
1618                if (c->first->ParentPkg != V->ParentPkg)
1619                   continue;
1620                itsFine = true;
1621                break;
1622             }
1623          }
1624
1625          if (itsFine == false)
1626          {
1627             // change the candidate
1628             Changed.push_back(make_pair(V, TargetVer));
1629             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1630             {
1631                if (stillOr == false)
1632                   break;
1633                // undo the candidate changing
1634                SetCandidateVersion(oldCand);
1635                Changed.pop_back();
1636                continue;
1637             }
1638             itsFine = true;
1639          }
1640
1641          // something in the or-group was fine, skip all other members
1642          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1643          break;
1644       }
1645
1646       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1647       {
1648          // undo all changes which aren't lead to a solution
1649          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1650               c != Changed.end(); ++c)
1651             SetCandidateVersion(c->first);
1652          Changed.erase(newChanged, Changed.end());
1653          return false;
1654       }
1655    }
1656    return true;
1657 }
1658                                                                         /*}}}*/
1659 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1660 // ---------------------------------------------------------------------
1661 /* */
1662 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1663 {
1664   StateCache &state = PkgState[Pkg->ID];
1665
1666   ActionGroup group(*this);
1667
1668   if(Auto)
1669     state.Flags |= Flag::Auto;
1670   else
1671     state.Flags &= ~Flag::Auto;
1672 }
1673                                                                         /*}}}*/
1674 // StateCache::Update - Compute the various static display things       /*{{{*/
1675 // ---------------------------------------------------------------------
1676 /* This is called whenever the Candidate version changes. */
1677 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1678 {
1679    // Some info
1680    VerIterator Ver = CandidateVerIter(Cache);
1681
1682    // Use a null string or the version string
1683    if (Ver.end() == true)
1684       CandVersion = "";
1685    else
1686       CandVersion = Ver.VerStr();
1687
1688    // Find the current version
1689    CurVersion = "";
1690    if (Pkg->CurrentVer != 0)
1691       CurVersion = Pkg.CurrentVer().VerStr();
1692
1693    // Strip off the epochs for display
1694    CurVersion = StripEpoch(CurVersion);
1695    CandVersion = StripEpoch(CandVersion);
1696
1697    // Figure out if its up or down or equal
1698    Status = Ver.CompareVer(Pkg.CurrentVer());
1699    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1700      Status = 2;
1701 }
1702                                                                         /*}}}*/
1703 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1704 // ---------------------------------------------------------------------
1705 /* */
1706 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1707 {
1708    if (Ver == 0)
1709       return 0;
1710
1711    // Strip any epoch
1712    char const * const I = strchr(Ver, ':');
1713    if (I == nullptr)
1714       return Ver;
1715    return I + 1;
1716 }
1717                                                                         /*}}}*/
1718 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1719 // ---------------------------------------------------------------------
1720 /* The default just returns the highest available version that is not
1721    a source and automatic. */
1722 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1723 {
1724    /* Not source/not automatic versions cannot be a candidate version
1725       unless they are already installed */
1726    VerIterator Last;
1727
1728    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1729    {
1730       if (Pkg.CurrentVer() == I)
1731          return I;
1732
1733       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1734       {
1735          if (J.File().Flagged(Flag::NotSource))
1736             continue;
1737
1738          /* Stash the highest version of a not-automatic source, we use it
1739             if there is nothing better */
1740          if (J.File().Flagged(Flag::NotAutomatic) ||
1741              J.File().Flagged(Flag::ButAutomaticUpgrades))
1742          {
1743             if (Last.end() == true)
1744                Last = I;
1745             continue;
1746          }
1747
1748          return I;
1749       }
1750    }
1751
1752    return Last;
1753 }
1754                                                                         /*}}}*/
1755 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1756 // ---------------------------------------------------------------------
1757 /* */
1758 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep) const
1759 {
1760    if(Dep.IsCritical())
1761       return true;
1762    else if(Dep->Type == pkgCache::Dep::Recommends)
1763    {
1764       if (InstallRecommends)
1765          return true;
1766       // we suport a special mode to only install-recommends for certain
1767       // sections
1768       // FIXME: this is a meant as a temporarly solution until the
1769       //        recommends are cleaned up
1770       const char *sec = Dep.ParentVer().Section();
1771       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1772          return true;
1773    }
1774    else if(Dep->Type == pkgCache::Dep::Suggests)
1775       return InstallSuggests;
1776
1777    return false;
1778 }
1779                                                                         /*}}}*/
1780 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1781 APT_CONST signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &/*Pkg*/)
1782 { return 0; }
1783 APT_CONST signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &/*File*/)
1784 { return 0; }
1785                                                                         /*}}}*/
1786 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1787 {
1788   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1789   if(f->wasConstructedSuccessfully())
1790     return f;
1791   else
1792     {
1793       delete f;
1794       return NULL;
1795     }
1796 }
1797                                                                         /*}}}*/
1798 bool pkgDepCache::MarkFollowsRecommends()
1799 {
1800   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1801 }
1802
1803 bool pkgDepCache::MarkFollowsSuggests()
1804 {
1805   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1806 }
1807
1808 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1809 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1810 {
1811    if (_config->Find("APT::Solver", "internal") != "internal")
1812       return true;
1813
1814    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1815
1816    // init the states
1817    map_id_t const PackagesCount = Head().PackageCount;
1818    for(map_id_t i = 0; i < PackagesCount; ++i)
1819    {
1820       PkgState[i].Marked  = false;
1821       PkgState[i].Garbage = false;
1822    }
1823    if (debug_autoremove)
1824       for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1825          if(PkgState[p->ID].Flags & Flag::Auto)
1826             std::clog << "AutoDep: " << p.FullName() << std::endl;
1827
1828    bool const follow_recommends = MarkFollowsRecommends();
1829    bool const follow_suggests   = MarkFollowsSuggests();
1830
1831    // do the mark part, this is the core bit of the algorithm
1832    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1833    {
1834       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1835           (p->Flags & Flag::Essential) ||
1836           (p->Flags & Flag::Important) ||
1837           userFunc.InRootSet(p) ||
1838           // be nice even then a required package violates the policy (#583517)
1839           // and do the full mark process also for required packages
1840           (p.CurrentVer().end() != true &&
1841            p.CurrentVer()->Priority == pkgCache::State::Required) ||
1842           // packages which can't be changed (like holds) can't be garbage
1843           (IsModeChangeOk(ModeGarbage, p, 0, false) == false))
1844       {
1845          // the package is installed (and set to keep)
1846          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1847             MarkPackage(p, p.CurrentVer(),
1848                         follow_recommends, follow_suggests);
1849          // the package is to be installed
1850          else if(PkgState[p->ID].Install())
1851             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1852                         follow_recommends, follow_suggests);
1853       }
1854    }
1855
1856    return true;
1857 }
1858                                                                         /*}}}*/
1859 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1860 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1861                               const pkgCache::VerIterator &ver,
1862                               bool const &follow_recommends,
1863                               bool const &follow_suggests)
1864 {
1865    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1866
1867    // if we are marked already we are done
1868    if(state.Marked)
1869       return;
1870
1871    VerIterator const currver = pkg.CurrentVer();
1872    VerIterator const instver = state.InstVerIter(*this);
1873
1874 #if 0
1875    VerIterator const candver = state.CandidateVerIter(*this);
1876
1877    // If a package was garbage-collected but is now being marked, we
1878    // should re-select it
1879    // For cases when a pkg is set to upgrade and this trigger the
1880    // removal of a no-longer used dependency.  if the pkg is set to
1881    // keep again later it will result in broken deps
1882    if(state.Delete() && state.RemoveReason = Unused)
1883    {
1884       if(ver==candver)
1885          mark_install(pkg, false, false, NULL);
1886       else if(ver==pkg.CurrentVer())
1887          MarkKeep(pkg, false, false);
1888
1889       instver=state.InstVerIter(*this);
1890    }
1891 #endif
1892
1893    // For packages that are not going to be removed, ignore versions
1894    // other than the InstVer.  For packages that are going to be
1895    // removed, ignore versions other than the current version.
1896    if(!(ver == instver && !instver.end()) &&
1897       !(ver == currver && instver.end() && !ver.end()))
1898       return;
1899
1900    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1901
1902    if(debug_autoremove)
1903      {
1904        std::clog << "Marking: " << pkg.FullName();
1905        if(!ver.end())
1906          std::clog << " " << ver.VerStr();
1907        if(!currver.end())
1908          std::clog << ", Curr=" << currver.VerStr();
1909        if(!instver.end())
1910          std::clog << ", Inst=" << instver.VerStr();
1911        std::clog << std::endl;
1912      }
1913
1914    state.Marked=true;
1915
1916    if(ver.end() == true)
1917       return;
1918
1919      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1920      {
1921         if(d->Type == Dep::Depends ||
1922            d->Type == Dep::PreDepends ||
1923            (follow_recommends &&
1924             d->Type == Dep::Recommends) ||
1925            (follow_suggests &&
1926             d->Type == Dep::Suggests))
1927         {
1928            // Try all versions of this package.
1929            for(VerIterator V = d.TargetPkg().VersionList();
1930                !V.end(); ++V)
1931            {
1932               if(d.IsSatisfied(V))
1933               {
1934                 if(debug_autoremove)
1935                   {
1936                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1937                               << " " << d.ParentVer().VerStr() << " "
1938                               << d.DepType() << " " << d.TargetPkg().FullName();
1939                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1940                       {
1941                         std::clog << " (" << d.CompType() << " "
1942                                   << d.TargetVer() << ")";
1943                       }
1944                     std::clog << std::endl;
1945                   }
1946                  MarkPackage(V.ParentPkg(), V,
1947                              follow_recommends, follow_suggests);
1948               }
1949            }
1950            // Now try virtual packages
1951            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1952                !prv.end(); ++prv)
1953            {
1954               if(d.IsSatisfied(prv))
1955               {
1956                 if(debug_autoremove)
1957                   {
1958                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1959                               << d.ParentVer().VerStr() << " "
1960                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1961                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1962                       {
1963                         std::clog << " (" << d.CompType() << " "
1964                                   << d.TargetVer() << ")";
1965                       }
1966                     std::clog << ", provided by "
1967                               << prv.OwnerPkg().FullName() << " "
1968                               << prv.OwnerVer().VerStr()
1969                               << std::endl;
1970                   }
1971
1972                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1973                              follow_recommends, follow_suggests);
1974               }
1975            }
1976         }
1977      }
1978 }
1979                                                                         /*}}}*/
1980 bool pkgDepCache::Sweep()                                               /*{{{*/
1981 {
1982    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1983
1984    // do the sweep
1985    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1986    {
1987      StateCache &state=PkgState[p->ID];
1988
1989      // skip required packages
1990      if (!p.CurrentVer().end() &&
1991          (p.CurrentVer()->Priority == pkgCache::State::Required))
1992         continue;
1993
1994      // if it is not marked and it is installed, it's garbage
1995      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1996      {
1997         state.Garbage=true;
1998         if(debug_autoremove)
1999            std::clog << "Garbage: " << p.FullName() << std::endl;
2000      }
2001   }
2002
2003    return true;
2004 }
2005                                                                         /*}}}*/
2006 // DepCache::MarkAndSweep                                               /*{{{*/
2007 bool pkgDepCache::MarkAndSweep(InRootSetFunc &rootFunc)
2008 {
2009    return MarkRequired(rootFunc) && Sweep();
2010 }
2011 bool pkgDepCache::MarkAndSweep()
2012 {
2013    std::auto_ptr<InRootSetFunc> f(GetRootSetFunc());
2014    if(f.get() != NULL)
2015       return MarkAndSweep(*f.get());
2016    else
2017       return false;
2018 }
2019                                                                         /*}}}*/