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       // higher priority seems like a good idea
 968       if (AV->Priority != BV->Priority)
 969          return AV->Priority < BV->Priority;
 970       // prefer native architecture
 971       if (strcmp(A.Arch(), B.Arch()) != 0)
 972       {
 973          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
 974             return false;
 975          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
 976             return true;
 977          std::vector<std::string> archs = APT::Configuration::getArchitectures();
 978          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
 979             if (*a == A.Arch())
 980                return false;
 981             else if (*a == B.Arch())
 982                return true;
 983       }
 984       // unable to decide…
 985       return A->ID < B->ID;
 986    }
 987 };
 988 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 989                               unsigned long Depth, bool FromUser,
 990                               bool ForceImportantDeps)
 991 {
 992    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
 993       return false;
 994
 995    StateCache &P = PkgState[Pkg->ID];
 996
 997    // See if there is even any possible instalation candidate
 998    if (P.CandidateVer == 0)
 999       return false;
1000
1001    /* Check that it is not already marked for install and that it can be
1002       installed */
1003    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1004        (P.Mode == ModeInstall ||
1005         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1006    {
1007       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1008          return MarkKeep(Pkg, false, FromUser, Depth+1);
1009       return true;
1010    }
1011
1012    // check if we are allowed to install the package
1013    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1014       return false;
1015
1016    ActionGroup group(*this);
1017    P.iFlags &= ~AutoKept;
1018
1019    /* Target the candidate version and remove the autoflag. We reset the
1020       autoflag below if this was called recursively. Otherwise the user
1021       should have the ability to de-auto a package by changing its state */
1022    RemoveSizes(Pkg);
1023    RemoveStates(Pkg);
1024
1025    P.Mode = ModeInstall;
1026    P.InstallVer = P.CandidateVer;
1027
1028    if(FromUser)
1029      {
1030        // Set it to manual if it's a new install or already installed,
1031        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1032        // or if we do automatic installation (aptitude never does it)
1033        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1034          P.Flags &= ~Flag::Auto;
1035      }
1036    else
1037      {
1038        // Set it to auto if this is a new install.
1039        if(P.Status == 2)
1040          P.Flags |= Flag::Auto;
1041      }
1042    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1043       P.Mode = ModeKeep;
1044
1045    AddStates(Pkg);
1046    Update(Pkg);
1047    AddSizes(Pkg);
1048
1049    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1050       return true;
1051
1052    if (DebugMarker == true)
1053       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1054
1055    DepIterator Dep = P.InstVerIter(*this).DependsList();
1056    for (; Dep.end() != true;)
1057    {
1058       // Grok or groups
1059       DepIterator Start = Dep;
1060       bool Result = true;
1061       unsigned Ors = 0;
1062       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1063       {
1064          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1065
1066          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1067             Result = false;
1068       }
1069
1070       // Dep is satisfied okay.
1071       if (Result == false)
1072          continue;
1073
1074       /* Check if this dep should be consider for install. If it is a user
1075          defined important dep and we are installed a new package then
1076          it will be installed. Otherwise we only check for important
1077          deps that have changed from the installed version
1078       */
1079       if (IsImportantDep(Start) == false)
1080          continue;
1081
1082       /* If we are in an or group locate the first or that can
1083          succeed. We have already cached this.. */
1084       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1085          ++Start;
1086       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1087       {
1088          if(DebugAutoInstall == true)
1089             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1090          if (Start.IsCritical() == false)
1091             continue;
1092          // if the dependency was critical, we can't install it, so remove it again
1093          MarkDelete(Pkg,false,Depth + 1, false);
1094          return false;
1095       }
1096
1097       /* Check if any ImportantDep() (but not Critical) were added
1098        * since we installed the package.  Also check for deps that
1099        * were satisfied in the past: for instance, if a version
1100        * restriction in a Recommends was tightened, upgrading the
1101        * package should follow that Recommends rather than causing the
1102        * dependency to be removed. (bug #470115)
1103        */
1104       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1105       {
1106          bool isNewImportantDep = true;
1107          bool isPreviouslySatisfiedImportantDep = false;
1108          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1109          {
1110             //FIXME: Should we handle or-group better here?
1111             // We do not check if the package we look for is part of the same or-group
1112             // we might find while searching, but could that really be a problem?
1113             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1114                 Start.TargetPkg() != D.TargetPkg())
1115                continue;
1116
1117             isNewImportantDep = false;
1118
1119             while ((D->CompareOp & Dep::Or) != 0)
1120                ++D;
1121
1122             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1123             if (isPreviouslySatisfiedImportantDep == true)
1124                break;
1125          }
1126
1127          if(isNewImportantDep == true)
1128          {
1129             if (DebugAutoInstall == true)
1130                std::clog << OutputInDepth(Depth) << "new important dependency: "
1131                          << Start.TargetPkg().FullName() << std::endl;
1132          }
1133          else if(isPreviouslySatisfiedImportantDep == true)
1134          {
1135             if (DebugAutoInstall == true)
1136                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1137                          << Start.TargetPkg().FullName() << std::endl;
1138          }
1139          else
1140          {
1141             if (DebugAutoInstall == true)
1142                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1143                          << Start.TargetPkg().FullName() << std::endl;
1144             continue;
1145          }
1146       }
1147
1148       /* This bit is for processing the possibilty of an install/upgrade
1149          fixing the problem */
1150       if (Start->Type != Dep::DpkgBreaks &&
1151           (DepState[Start->ID] & DepCVer) == DepCVer)
1152       {
1153          APT::VersionList verlist;
1154          pkgCache::VerIterator Cand = PkgState[Start.TargetPkg()->ID].CandidateVerIter(*this);
1155          if (Cand.end() == false && VS().CheckDep(Cand.VerStr(), Start->CompareOp, Start.TargetVer()) == true)
1156             verlist.insert(Cand);
1157          for (PrvIterator Prv = Start.TargetPkg().ProvidesList(); Prv.end() != true; ++Prv)
1158          {
1159             pkgCache::VerIterator V = Prv.OwnerVer();
1160             pkgCache::VerIterator Cand = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1161             if (Cand.end() == true || V != Cand ||
1162                 VS().CheckDep(Cand.VerStr(), Start->CompareOp, Start.TargetVer()) == false)
1163                continue;
1164             verlist.insert(Cand);
1165          }
1166          CompareProviders comp(Start);
1167          APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1168
1169          if (InstVer != verlist.end())
1170          {
1171             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1172             if(DebugAutoInstall == true)
1173                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1174                          << " as " << Start.DepType() << " of " << Pkg.Name()
1175                          << std::endl;
1176             // now check if we should consider it a automatic dependency or not
1177             if(Pkg.Section() && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
1178             {
1179                if(DebugAutoInstall == true)
1180                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1181                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1182                MarkInstall(InstPkg,true,Depth + 1, true);
1183             }
1184             else
1185             {
1186                // mark automatic dependency
1187                MarkInstall(InstPkg,true,Depth + 1, false, ForceImportantDeps);
1188                // Set the autoflag, after MarkInstall because MarkInstall unsets it
1189                if (InstPkg->CurrentVer == 0)
1190                   PkgState[InstPkg->ID].Flags |= Flag::Auto;
1191             }
1192          }
1193          continue;
1194       }
1195
1196       /* For conflicts we just de-install the package and mark as auto,
1197          Conflicts may not have or groups.  For dpkg's Breaks we try to
1198          upgrade the package. */
1199       if (Start.IsNegative() == true)
1200       {
1201          SPtrArray<Version *> List = Start.AllTargets();
1202          for (Version **I = List; *I != 0; I++)
1203          {
1204             VerIterator Ver(*this,*I);
1205             PkgIterator Pkg = Ver.ParentPkg();
1206
1207             /* The List includes all packages providing this dependency,
1208                even providers which are not installed, so skip them. */
1209             if (PkgState[Pkg->ID].InstallVer == 0)
1210                continue;
1211
1212             if (PkgState[Pkg->ID].CandidateVer != *I &&
1213                 Start->Type == Dep::DpkgBreaks &&
1214                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1215                continue;
1216             else if (MarkDelete(Pkg,false,Depth + 1, false) == false)
1217                break;
1218          }
1219          continue;
1220       }
1221    }
1222
1223    return Dep.end() == true;
1224 }
1225                                                                         /*}}}*/
1226 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1227 // ---------------------------------------------------------------------
1228 /* The default implementation does nothing.
1229    dpkg holds are enforced by the private IsModeChangeOk */
1230 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1231                               unsigned long Depth, bool FromUser)
1232 {
1233    return true;
1234 }
1235                                                                         /*}}}*/
1236 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1237 // ---------------------------------------------------------------------
1238 /* */
1239 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1240 {
1241    if (unlikely(Pkg.end() == true))
1242       return;
1243
1244    ActionGroup group(*this);
1245
1246    RemoveSizes(Pkg);
1247    RemoveStates(Pkg);
1248
1249    StateCache &P = PkgState[Pkg->ID];
1250    if (To == true)
1251       P.iFlags |= ReInstall;
1252    else
1253       P.iFlags &= ~ReInstall;
1254
1255    AddStates(Pkg);
1256    AddSizes(Pkg);
1257 }
1258                                                                         /*}}}*/
1259 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1260 // ---------------------------------------------------------------------
1261 /* */
1262 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1263 {
1264    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1265    StateCache &P = PkgState[Pkg->ID];
1266
1267    if (P.CandidateVer == TargetVer)
1268       return;
1269
1270    ActionGroup group(*this);
1271
1272    RemoveSizes(Pkg);
1273    RemoveStates(Pkg);
1274
1275    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1276       P.InstallVer = (Version *)TargetVer;
1277    P.CandidateVer = (Version *)TargetVer;
1278    P.Update(Pkg,*this);
1279
1280    AddStates(Pkg);
1281    Update(Pkg);
1282    AddSizes(Pkg);
1283
1284 }
1285                                                                         /*}}}*/
1286 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1287 // ---------------------------------------------------------------------
1288 /* changes the candidate of a package and walks over all its dependencies
1289    to check if it needs to change the candidate of the dependency, too,
1290    to reach a installable versionstate */
1291 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1292                                         std::string const &TargetRel)
1293 {
1294    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1295    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1296 }
1297 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1298                                         std::string const &TargetRel,
1299                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1300 {
1301    ActionGroup group(*this);
1302    SetCandidateVersion(TargetVer);
1303
1304    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1305       return true;
1306
1307    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1308    // save the position of the last element we will not undo - if we have to
1309    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1310
1311    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1312    {
1313       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1314           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1315            IsImportantDep(D) == false))
1316          continue;
1317
1318       // walk over an or-group and check if we need to do anything
1319       // for simpilicity no or-group is handled as a or-group including one dependency
1320       pkgCache::DepIterator Start = D;
1321       bool itsFine = false;
1322       for (bool stillOr = true; stillOr == true; ++Start)
1323       {
1324          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1325          pkgCache::PkgIterator const P = Start.TargetPkg();
1326          // virtual packages can't be a solution
1327          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1328             continue;
1329          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1330          // no versioned dependency - but is it installable?
1331          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1332          {
1333             // Check if one of the providers is installable
1334             if (P->ProvidesList != 0)
1335             {
1336                pkgCache::PrvIterator Prv = P.ProvidesList();
1337                for (; Prv.end() == false; ++Prv)
1338                {
1339                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1340                   if (C.end() == true || C != Prv.OwnerVer() ||
1341                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1342                      continue;
1343                   break;
1344                }
1345                if (Prv.end() == true)
1346                   continue;
1347             }
1348             // no providers, so check if we have an installable candidate version
1349             else if (Cand.end() == true ||
1350                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1351                continue;
1352             itsFine = true;
1353             break;
1354          }
1355          if (Cand.end() == true)
1356             continue;
1357          // check if the current candidate is enough for the versioned dependency - and installable?
1358          if (VS().CheckDep(P.CandVersion(), Start->CompareOp, Start.TargetVer()) == true &&
1359              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1360          {
1361             itsFine = true;
1362             break;
1363          }
1364       }
1365
1366       if (itsFine == true) {
1367          // something in the or-group was fine, skip all other members
1368          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1369          continue;
1370       }
1371
1372       // walk again over the or-group and check each if a candidate switch would help
1373       itsFine = false;
1374       for (bool stillOr = true; stillOr == true; ++D)
1375       {
1376          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1377          // changing candidate will not help if the dependency is not versioned
1378          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1379          {
1380             if (stillOr == true)
1381                continue;
1382             break;
1383          }
1384
1385          pkgCache::VerIterator V;
1386          if (TargetRel == "newest")
1387             V = D.TargetPkg().VersionList();
1388          else
1389             V = Match.Find(D.TargetPkg());
1390
1391          // check if the version from this release could satisfy the dependency
1392          if (V.end() == true || VS().CheckDep(V.VerStr(), D->CompareOp, D.TargetVer()) == false)
1393          {
1394             if (stillOr == true)
1395                continue;
1396             break;
1397          }
1398
1399          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1400          if (V == oldCand)
1401          {
1402             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1403             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1404                  c != Changed.end(); ++c)
1405             {
1406                if (c->first->ParentPkg != V->ParentPkg)
1407                   continue;
1408                itsFine = true;
1409                break;
1410             }
1411          }
1412
1413          if (itsFine == false)
1414          {
1415             // change the candidate
1416             Changed.push_back(make_pair(oldCand, TargetVer));
1417             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1418             {
1419                if (stillOr == false)
1420                   break;
1421                // undo the candidate changing
1422                SetCandidateVersion(oldCand);
1423                Changed.pop_back();
1424                continue;
1425             }
1426             itsFine = true;
1427          }
1428
1429          // something in the or-group was fine, skip all other members
1430          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1431          break;
1432       }
1433
1434       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1435       {
1436          // undo all changes which aren't lead to a solution
1437          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1438               c != Changed.end(); ++c)
1439             SetCandidateVersion(c->first);
1440          Changed.erase(newChanged, Changed.end());
1441          return false;
1442       }
1443    }
1444    return true;
1445 }
1446                                                                         /*}}}*/
1447 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1448 // ---------------------------------------------------------------------
1449 /* */
1450 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1451 {
1452   StateCache &state = PkgState[Pkg->ID];
1453
1454   ActionGroup group(*this);
1455
1456   if(Auto)
1457     state.Flags |= Flag::Auto;
1458   else
1459     state.Flags &= ~Flag::Auto;
1460 }
1461                                                                         /*}}}*/
1462 // StateCache::Update - Compute the various static display things       /*{{{*/
1463 // ---------------------------------------------------------------------
1464 /* This is called whenever the Candidate version changes. */
1465 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1466 {
1467    // Some info
1468    VerIterator Ver = CandidateVerIter(Cache);
1469
1470    // Use a null string or the version string
1471    if (Ver.end() == true)
1472       CandVersion = "";
1473    else
1474       CandVersion = Ver.VerStr();
1475
1476    // Find the current version
1477    CurVersion = "";
1478    if (Pkg->CurrentVer != 0)
1479       CurVersion = Pkg.CurrentVer().VerStr();
1480
1481    // Strip off the epochs for display
1482    CurVersion = StripEpoch(CurVersion);
1483    CandVersion = StripEpoch(CandVersion);
1484
1485    // Figure out if its up or down or equal
1486    Status = Ver.CompareVer(Pkg.CurrentVer());
1487    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1488      Status = 2;
1489 }
1490                                                                         /*}}}*/
1491 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1492 // ---------------------------------------------------------------------
1493 /* */
1494 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1495 {
1496    if (Ver == 0)
1497       return 0;
1498
1499    // Strip any epoch
1500    for (const char *I = Ver; *I != 0; I++)
1501       if (*I == ':')
1502          return I + 1;
1503    return Ver;
1504 }
1505                                                                         /*}}}*/
1506 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1507 // ---------------------------------------------------------------------
1508 /* The default just returns the highest available version that is not
1509    a source and automatic. */
1510 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1511 {
1512    /* Not source/not automatic versions cannot be a candidate version
1513       unless they are already installed */
1514    VerIterator Last(*(pkgCache *)this,0);
1515
1516    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1517    {
1518       if (Pkg.CurrentVer() == I)
1519          return I;
1520
1521       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1522       {
1523          if ((J.File()->Flags & Flag::NotSource) != 0)
1524             continue;
1525
1526          /* Stash the highest version of a not-automatic source, we use it
1527             if there is nothing better */
1528          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1529              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1530          {
1531             if (Last.end() == true)
1532                Last = I;
1533             continue;
1534          }
1535
1536          return I;
1537       }
1538    }
1539
1540    return Last;
1541 }
1542                                                                         /*}}}*/
1543 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1544 // ---------------------------------------------------------------------
1545 /* */
1546 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1547 {
1548    if(Dep.IsCritical())
1549       return true;
1550    else if(Dep->Type == pkgCache::Dep::Recommends)
1551    {
1552       if (InstallRecommends)
1553          return true;
1554       // we suport a special mode to only install-recommends for certain
1555       // sections
1556       // FIXME: this is a meant as a temporarly solution until the
1557       //        recommends are cleaned up
1558       const char *sec = Dep.ParentVer().Section();
1559       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1560          return true;
1561    }
1562    else if(Dep->Type == pkgCache::Dep::Suggests)
1563       return InstallSuggests;
1564
1565    return false;
1566 }
1567                                                                         /*}}}*/
1568 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1569 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &Pkg)
1570 { return 0; };
1571 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &File)
1572 { return 0; };
1573                                                                         /*}}}*/
1574 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1575 {
1576   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1577   if(f->wasConstructedSuccessfully())
1578     return f;
1579   else
1580     {
1581       delete f;
1582       return NULL;
1583     }
1584 }
1585                                                                         /*}}}*/
1586 bool pkgDepCache::MarkFollowsRecommends()
1587 {
1588   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1589 }
1590
1591 bool pkgDepCache::MarkFollowsSuggests()
1592 {
1593   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1594 }
1595
1596 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1597 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1598 {
1599    if (_config->Find("APT::Solver", "internal") != "internal")
1600       return true;
1601
1602    bool follow_recommends;
1603    bool follow_suggests;
1604    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1605
1606    // init the states
1607    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1608    {
1609       PkgState[p->ID].Marked  = false;
1610       PkgState[p->ID].Garbage = false;
1611
1612       // debug output
1613       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1614          std::clog << "AutoDep: " << p.FullName() << std::endl;
1615    }
1616
1617    // init vars
1618    follow_recommends = MarkFollowsRecommends();
1619    follow_suggests   = MarkFollowsSuggests();
1620
1621
1622
1623    // do the mark part, this is the core bit of the algorithm
1624    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1625    {
1626       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1627           (p->Flags & Flag::Essential) ||
1628           userFunc.InRootSet(p) ||
1629           // be nice even then a required package violates the policy (#583517)
1630           // and do the full mark process also for required packages
1631           (p.CurrentVer().end() != true &&
1632            p.CurrentVer()->Priority == pkgCache::State::Required))
1633       {
1634          // the package is installed (and set to keep)
1635          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1636             MarkPackage(p, p.CurrentVer(),
1637                         follow_recommends, follow_suggests);
1638          // the package is to be installed
1639          else if(PkgState[p->ID].Install())
1640             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1641                         follow_recommends, follow_suggests);
1642       }
1643    }
1644
1645    return true;
1646 }
1647                                                                         /*}}}*/
1648 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1649 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1650                               const pkgCache::VerIterator &ver,
1651                               bool const &follow_recommends,
1652                               bool const &follow_suggests)
1653 {
1654    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1655
1656    // if we are marked already we are done
1657    if(state.Marked)
1658       return;
1659
1660    VerIterator const currver = pkg.CurrentVer();
1661    VerIterator const instver = state.InstVerIter(*this);
1662
1663 #if 0
1664    VerIterator const candver = state.CandidateVerIter(*this);
1665
1666    // If a package was garbage-collected but is now being marked, we
1667    // should re-select it
1668    // For cases when a pkg is set to upgrade and this trigger the
1669    // removal of a no-longer used dependency.  if the pkg is set to
1670    // keep again later it will result in broken deps
1671    if(state.Delete() && state.RemoveReason = Unused)
1672    {
1673       if(ver==candver)
1674          mark_install(pkg, false, false, NULL);
1675       else if(ver==pkg.CurrentVer())
1676          MarkKeep(pkg, false, false);
1677
1678       instver=state.InstVerIter(*this);
1679    }
1680 #endif
1681
1682    // For packages that are not going to be removed, ignore versions
1683    // other than the InstVer.  For packages that are going to be
1684    // removed, ignore versions other than the current version.
1685    if(!(ver == instver && !instver.end()) &&
1686       !(ver == currver && instver.end() && !ver.end()))
1687       return;
1688
1689    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1690
1691    if(debug_autoremove)
1692      {
1693        std::clog << "Marking: " << pkg.FullName();
1694        if(!ver.end())
1695          std::clog << " " << ver.VerStr();
1696        if(!currver.end())
1697          std::clog << ", Curr=" << currver.VerStr();
1698        if(!instver.end())
1699          std::clog << ", Inst=" << instver.VerStr();
1700        std::clog << std::endl;
1701      }
1702
1703    state.Marked=true;
1704
1705    if(ver.end() == true)
1706       return;
1707
1708      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1709      {
1710         if(d->Type == Dep::Depends ||
1711            d->Type == Dep::PreDepends ||
1712            (follow_recommends &&
1713             d->Type == Dep::Recommends) ||
1714            (follow_suggests &&
1715             d->Type == Dep::Suggests))
1716         {
1717            // Try all versions of this package.
1718            for(VerIterator V = d.TargetPkg().VersionList();
1719                !V.end(); ++V)
1720            {
1721               if(_system->VS->CheckDep(V.VerStr(), d->CompareOp, d.TargetVer()))
1722               {
1723                 if(debug_autoremove)
1724                   {
1725                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1726                               << " " << d.ParentVer().VerStr() << " "
1727                               << d.DepType() << " " << d.TargetPkg().FullName();
1728                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1729                       {
1730                         std::clog << " (" << d.CompType() << " "
1731                                   << d.TargetVer() << ")";
1732                       }
1733                     std::clog << std::endl;
1734                   }
1735                  MarkPackage(V.ParentPkg(), V,
1736                              follow_recommends, follow_suggests);
1737               }
1738            }
1739            // Now try virtual packages
1740            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1741                !prv.end(); ++prv)
1742            {
1743               if(_system->VS->CheckDep(prv.ProvideVersion(), d->CompareOp,
1744                                        d.TargetVer()))
1745               {
1746                 if(debug_autoremove)
1747                   {
1748                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1749                               << d.ParentVer().VerStr() << " "
1750                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1751                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1752                       {
1753                         std::clog << " (" << d.CompType() << " "
1754                                   << d.TargetVer() << ")";
1755                       }
1756                     std::clog << ", provided by "
1757                               << prv.OwnerPkg().FullName() << " "
1758                               << prv.OwnerVer().VerStr()
1759                               << std::endl;
1760                   }
1761
1762                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1763                              follow_recommends, follow_suggests);
1764               }
1765            }
1766         }
1767      }
1768 }
1769                                                                         /*}}}*/
1770 bool pkgDepCache::Sweep()                                               /*{{{*/
1771 {
1772    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1773
1774    // do the sweep
1775    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1776    {
1777      StateCache &state=PkgState[p->ID];
1778
1779      // skip required packages
1780      if (!p.CurrentVer().end() &&
1781          (p.CurrentVer()->Priority == pkgCache::State::Required))
1782         continue;
1783
1784      // if it is not marked and it is installed, it's garbage
1785      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1786      {
1787         state.Garbage=true;
1788         if(debug_autoremove)
1789            std::clog << "Garbage: " << p.FullName() << std::endl;
1790      }
1791   }
1792
1793    return true;
1794 }
1795                                                                         /*}}}*/