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