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