apt-pkg/depcache.cc

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