apt-pkg/depcache.cc

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