apt-pkg/depcache.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: depcache.cc,v 1.25 2001/05/27 05:36:04 jgg Exp $
   4 /* ######################################################################
   5
   6    Dependency Cache - Caches Dependency information.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include<config.h>
  12
  13 #include <apt-pkg/depcache.h>
  14 #include <apt-pkg/version.h>
  15 #include <apt-pkg/versionmatch.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/sptr.h>
  18 #include <apt-pkg/algorithms.h>
  19 #include <apt-pkg/fileutl.h>
  20 #include <apt-pkg/strutl.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/aptconfiguration.h>
  23 #include <apt-pkg/pkgsystem.h>
  24 #include <apt-pkg/tagfile.h>
  25 #include <apt-pkg/progress.h>
  26 #include <apt-pkg/cacheset.h>
  27
  28 #include <algorithm>
  29 #include <iostream>
  30 #include <sstream>
  31 #include <set>
  32
  33 #include <sys/stat.h>
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37
  38 using std::string;
  39
  40 // helper for Install-Recommends-Sections and Never-MarkAuto-Sections   /*{{{*/
  41 static bool
  42 ConfigValueInSubTree(const char* SubTree, const char *needle)
  43 {
  44    Configuration::Item const *Opts;
  45    Opts = _config->Tree(SubTree);
  46    if (Opts != 0 && Opts->Child != 0)
  47    {
  48       Opts = Opts->Child;
  49       for (; Opts != 0; Opts = Opts->Next)
  50       {
  51          if (Opts->Value.empty() == true)
  52             continue;
  53          if (strcmp(needle, Opts->Value.c_str()) == 0)
  54             return true;
  55       }
  56    }
  57    return false;
  58 }
  59                                                                         /*}}}*/
  60 pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :             /*{{{*/
  61   cache(cache), released(false)
  62 {
  63   ++cache.group_level;
  64 }
  65
  66 void pkgDepCache::ActionGroup::release()
  67 {
  68   if(!released)
  69     {
  70       if(cache.group_level == 0)
  71         std::cerr << "W: Unbalanced action groups, expect badness" << std::endl;
  72       else
  73         {
  74           --cache.group_level;
  75
  76           if(cache.group_level == 0)
  77             cache.MarkAndSweep();
  78         }
  79
  80       released = true;
  81     }
  82 }
  83
  84 pkgDepCache::ActionGroup::~ActionGroup()
  85 {
  86   release();
  87 }
  88                                                                         /*}}}*/
  89 // DepCache::pkgDepCache - Constructors                                 /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 pkgDepCache::pkgDepCache(pkgCache *pCache,Policy *Plcy) :
  93   group_level(0), Cache(pCache), PkgState(0), DepState(0)
  94 {
  95    DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
  96    DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
  97    delLocalPolicy = 0;
  98    LocalPolicy = Plcy;
  99    if (LocalPolicy == 0)
 100       delLocalPolicy = LocalPolicy = new Policy;
 101 }
 102                                                                         /*}}}*/
 103 // DepCache::~pkgDepCache - Destructor                                  /*{{{*/
 104 // ---------------------------------------------------------------------
 105 /* */
 106 pkgDepCache::~pkgDepCache()
 107 {
 108    delete [] PkgState;
 109    delete [] DepState;
 110    delete delLocalPolicy;
 111 }
 112                                                                         /*}}}*/
 113 // DepCache::Init - Generate the initial extra structures.              /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* This allocats the extension buffers and initializes them. */
 116 bool pkgDepCache::Init(OpProgress *Prog)
 117 {
 118    // Suppress mark updates during this operation (just in case) and
 119    // run a mark operation when Init terminates.
 120    ActionGroup actions(*this);
 121
 122    delete [] PkgState;
 123    delete [] DepState;
 124    PkgState = new StateCache[Head().PackageCount];
 125    DepState = new unsigned char[Head().DependsCount];
 126    memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
 127    memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
 128
 129    if (Prog != 0)
 130    {
 131       Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
 132                             _("Building dependency tree"));
 133       Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
 134    }
 135
 136    /* Set the current state of everything. In this state all of the
 137       packages are kept exactly as is. See AllUpgrade */
 138    int Done = 0;
 139    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 140    {
 141       if (Prog != 0 && Done%20 == 0)
 142          Prog->Progress(Done);
 143
 144       // Find the proper cache slot
 145       StateCache &State = PkgState[I->ID];
 146       State.iFlags = 0;
 147
 148       // Figure out the install version
 149       State.CandidateVer = GetCandidateVer(I);
 150       State.InstallVer = I.CurrentVer();
 151       State.Mode = ModeKeep;
 152
 153       State.Update(I,*this);
 154    }
 155
 156    if (Prog != 0)
 157    {
 158
 159       Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
 160                             Head().PackageCount,
 161                             _("Building dependency tree"));
 162       Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
 163    }
 164
 165    Update(Prog);
 166
 167    if(Prog != 0)
 168       Prog->Done();
 169
 170    return true;
 171 }
 172                                                                         /*}}}*/
 173 bool pkgDepCache::readStateFile(OpProgress *Prog)                       /*{{{*/
 174 {
 175    FileFd state_file;
 176    string const state = _config->FindFile("Dir::State::extended_states");
 177    if(RealFileExists(state)) {
 178       state_file.Open(state, FileFd::ReadOnly);
 179       off_t const file_size = state_file.Size();
 180       if(Prog != NULL)
 181          Prog->OverallProgress(0, file_size, 1,
 182                                _("Reading state information"));
 183
 184       pkgTagFile tagfile(&state_file);
 185       pkgTagSection section;
 186       off_t amt = 0;
 187       bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 188       while(tagfile.Step(section)) {
 189          string const pkgname = section.FindS("Package");
 190          string pkgarch = section.FindS("Architecture");
 191          if (pkgarch.empty() == true)
 192             pkgarch = "any";
 193          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 194          // Silently ignore unknown packages and packages with no actual version.
 195          if(pkg.end() == true || pkg->VersionList == 0)
 196             continue;
 197
 198          short const reason = section.FindI("Auto-Installed", 0);
 199          if(reason > 0)
 200          {
 201             PkgState[pkg->ID].Flags |= Flag::Auto;
 202             if (unlikely(debug_autoremove))
 203                std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
 204             if (pkgarch == "any")
 205             {
 206                pkgCache::GrpIterator G = pkg.Group();
 207                for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
 208                   if (pkg->VersionList != 0)
 209                      PkgState[pkg->ID].Flags |= Flag::Auto;
 210             }
 211          }
 212          amt += section.size();
 213          if(Prog != NULL)
 214             Prog->OverallProgress(amt, file_size, 1,
 215                                   _("Reading state information"));
 216       }
 217       if(Prog != NULL)
 218          Prog->OverallProgress(file_size, file_size, 1,
 219                                _("Reading state information"));
 220    }
 221
 222    return true;
 223 }
 224                                                                         /*}}}*/
 225 bool pkgDepCache::writeStateFile(OpProgress *prog, bool InstalledOnly)  /*{{{*/
 226 {
 227    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 228
 229    if(debug_autoremove)
 230       std::clog << "pkgDepCache::writeStateFile()" << std::endl;
 231
 232    FileFd StateFile;
 233    string const state = _config->FindFile("Dir::State::extended_states");
 234
 235    // if it does not exist, create a empty one
 236    if(!RealFileExists(state))
 237    {
 238       StateFile.Open(state, FileFd::WriteAtomic);
 239       StateFile.Close();
 240    }
 241
 242    // open it
 243    if(!StateFile.Open(state, FileFd::ReadOnly))
 244       return _error->Error(_("Failed to open StateFile %s"),
 245                            state.c_str());
 246
 247    FILE *OutFile;
 248    string const outfile = state + ".tmp";
 249    if((OutFile = fopen(outfile.c_str(),"w")) == NULL)
 250       return _error->Error(_("Failed to write temporary StateFile %s"),
 251                            outfile.c_str());
 252
 253    // first merge with the existing sections
 254    pkgTagFile tagfile(&StateFile);
 255    pkgTagSection section;
 256    std::set<string> pkgs_seen;
 257    const char *nullreorderlist[] = {0};
 258    while(tagfile.Step(section)) {
 259          string const pkgname = section.FindS("Package");
 260          string pkgarch = section.FindS("Architecture");
 261          if (pkgarch.empty() == true)
 262             pkgarch = "native";
 263          // Silently ignore unknown packages and packages with no actual
 264          // version.
 265          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 266          if(pkg.end() || pkg.VersionList().end())
 267             continue;
 268          StateCache const &P = PkgState[pkg->ID];
 269          bool newAuto = (P.Flags & Flag::Auto);
 270          // skip not installed or now-removed ones if requested
 271          if (InstalledOnly && (
 272              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 273              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 274          {
 275             // The section is obsolete if it contains no other tag
 276             unsigned int const count = section.Count();
 277             if (count < 2 ||
 278                 (count == 2 && section.Exists("Auto-Installed")) ||
 279                 (count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
 280                continue;
 281             else
 282                newAuto = false;
 283          }
 284          if(_config->FindB("Debug::pkgAutoRemove",false))
 285             std::clog << "Update existing AutoInstall info: "
 286                       << pkg.FullName() << std::endl;
 287          TFRewriteData rewrite[3];
 288          rewrite[0].Tag = "Architecture";
 289          rewrite[0].Rewrite = pkg.Arch();
 290          rewrite[0].NewTag = 0;
 291          rewrite[1].Tag = "Auto-Installed";
 292          rewrite[1].Rewrite = newAuto ? "1" : "0";
 293          rewrite[1].NewTag = 0;
 294          rewrite[2].Tag = 0;
 295          TFRewrite(OutFile, section, nullreorderlist, rewrite);
 296          fprintf(OutFile,"\n");
 297          pkgs_seen.insert(pkg.FullName());
 298    }
 299
 300    // then write the ones we have not seen yet
 301    std::ostringstream ostr;
 302    for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); ++pkg) {
 303       StateCache const &P = PkgState[pkg->ID];
 304       if(P.Flags & Flag::Auto) {
 305          if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
 306             if(debug_autoremove)
 307                std::clog << "Skipping already written " << pkg.FullName() << std::endl;
 308             continue;
 309          }
 310          // skip not installed ones if requested
 311          if (InstalledOnly && (
 312              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 313              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 314             continue;
 315          const char* const pkgarch = pkg.Arch();
 316          if (strcmp(pkgarch, "all") == 0)
 317             continue;
 318          if(debug_autoremove)
 319             std::clog << "Writing new AutoInstall: " << pkg.FullName() << std::endl;
 320          ostr.str(string(""));
 321          ostr << "Package: " << pkg.Name()
 322               << "\nArchitecture: " << pkgarch
 323               << "\nAuto-Installed: 1\n\n";
 324          fprintf(OutFile,"%s",ostr.str().c_str());
 325       }
 326    }
 327    fclose(OutFile);
 328
 329    // move the outfile over the real file and set permissions
 330    rename(outfile.c_str(), state.c_str());
 331    chmod(state.c_str(), 0644);
 332
 333    return true;
 334 }
 335                                                                         /*}}}*/
 336 // DepCache::CheckDep - Checks a single dependency                      /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /* This first checks the dependency against the main target package and
 339    then walks along the package provides list and checks if each provides
 340    will be installed then checks the provides against the dep. Res will be
 341    set to the package which was used to satisfy the dep. */
 342 bool pkgDepCache::CheckDep(DepIterator Dep,int Type,PkgIterator &Res)
 343 {
 344    Res = Dep.TargetPkg();
 345
 346    /* Check simple depends. A depends -should- never self match but
 347       we allow it anyhow because dpkg does. Technically it is a packaging
 348       bug. Conflicts may never self match */
 349    if (Dep.IsIgnorable(Res) == false)
 350    {
 351       PkgIterator Pkg = Dep.TargetPkg();
 352       // Check the base package
 353       if (Type == NowVersion && Pkg->CurrentVer != 0)
 354          if (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    // not changing the mode is obviously also fine as we might want to call
 917    // e.g. MarkInstall multiple times with different arguments for the same package
 918    if (P.Mode == mode)
 919       return true;
 920
 921    // if previous state was set by user only user can reset it
 922    if ((P.iFlags & Protected) == Protected)
 923    {
 924       if (unlikely(DebugMarker == true))
 925          std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
 926                    << " of " << Pkg << " as its mode (" << PrintMode(P.Mode)
 927                    << ") is protected" << std::endl;
 928       return false;
 929    }
 930    // enforce dpkg holds
 931    else if (mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 932             _config->FindB("APT::Ignore-Hold",false) == false)
 933    {
 934       if (unlikely(DebugMarker == true))
 935          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 936                    << " of " << Pkg << std::endl;
 937       return false;
 938    }
 939
 940    return true;
 941 }
 942                                                                         /*}}}*/
 943 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 944 // ---------------------------------------------------------------------
 945 /* */
 946 struct CompareProviders {
 947    pkgCache::PkgIterator const Pkg;
 948    CompareProviders(pkgCache::DepIterator const &Dep) : Pkg(Dep.TargetPkg()) {};
 949    //bool operator() (APT::VersionList::iterator const &AV, APT::VersionList::iterator const &BV)
 950    bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
 951    {
 952       pkgCache::PkgIterator const A = AV.ParentPkg();
 953       pkgCache::PkgIterator const B = BV.ParentPkg();
 954       // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
 955       if (A->Group != B->Group)
 956       {
 957          if (A->Group == Pkg->Group && B->Group != Pkg->Group)
 958             return false;
 959          else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
 960             return true;
 961       }
 962       // we like essentials
 963       if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
 964       {
 965          if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 966             return false;
 967          else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 968             return true;
 969       }
 970       if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
 971       {
 972          if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
 973             return false;
 974          else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
 975             return true;
 976       }
 977       // higher priority seems like a good idea
 978       if (AV->Priority != BV->Priority)
 979          return AV->Priority < BV->Priority;
 980       // prefer native architecture
 981       if (strcmp(A.Arch(), B.Arch()) != 0)
 982       {
 983          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
 984             return false;
 985          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
 986             return true;
 987          std::vector<std::string> archs = APT::Configuration::getArchitectures();
 988          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
 989             if (*a == A.Arch())
 990                return false;
 991             else if (*a == B.Arch())
 992                return true;
 993       }
 994       // unable to decide…
 995       return A->ID < B->ID;
 996    }
 997 };
 998 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 999                               unsigned long Depth, bool FromUser,
1000                               bool ForceImportantDeps)
1001 {
1002    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
1003       return false;
1004
1005    StateCache &P = PkgState[Pkg->ID];
1006
1007    // See if there is even any possible instalation candidate
1008    if (P.CandidateVer == 0)
1009       return false;
1010
1011    /* Check that it is not already marked for install and that it can be
1012       installed */
1013    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1014        (P.Mode == ModeInstall ||
1015         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1016    {
1017       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1018          return MarkKeep(Pkg, false, FromUser, Depth+1);
1019       return true;
1020    }
1021
1022    // check if we are allowed to install the package
1023    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1024       return false;
1025
1026    ActionGroup group(*this);
1027    P.iFlags &= ~AutoKept;
1028
1029    /* Target the candidate version and remove the autoflag. We reset the
1030       autoflag below if this was called recursively. Otherwise the user
1031       should have the ability to de-auto a package by changing its state */
1032    RemoveSizes(Pkg);
1033    RemoveStates(Pkg);
1034
1035    P.Mode = ModeInstall;
1036    P.InstallVer = P.CandidateVer;
1037
1038    if(FromUser)
1039      {
1040        // Set it to manual if it's a new install or already installed,
1041        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1042        // or if we do automatic installation (aptitude never does it)
1043        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1044          P.Flags &= ~Flag::Auto;
1045      }
1046    else
1047      {
1048        // Set it to auto if this is a new install.
1049        if(P.Status == 2)
1050          P.Flags |= Flag::Auto;
1051      }
1052    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1053       P.Mode = ModeKeep;
1054
1055    AddStates(Pkg);
1056    Update(Pkg);
1057    AddSizes(Pkg);
1058
1059    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1060       return true;
1061
1062    if (DebugMarker == true)
1063       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1064
1065    DepIterator Dep = P.InstVerIter(*this).DependsList();
1066    for (; Dep.end() != true;)
1067    {
1068       // Grok or groups
1069       DepIterator Start = Dep;
1070       bool Result = true;
1071       unsigned Ors = 0;
1072       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1073       {
1074          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1075
1076          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1077             Result = false;
1078       }
1079
1080       // Dep is satisfied okay.
1081       if (Result == false)
1082          continue;
1083
1084       /* Check if this dep should be consider for install. If it is a user
1085          defined important dep and we are installed a new package then
1086          it will be installed. Otherwise we only check for important
1087          deps that have changed from the installed version
1088       */
1089       if (IsImportantDep(Start) == false)
1090          continue;
1091
1092       /* If we are in an or group locate the first or that can
1093          succeed. We have already cached this.. */
1094       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1095          ++Start;
1096       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1097       {
1098          if(DebugAutoInstall == true)
1099             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1100          if (Start.IsCritical() == false)
1101             continue;
1102          // if the dependency was critical, we can't install it, so remove it again
1103          MarkDelete(Pkg,false,Depth + 1, false);
1104          return false;
1105       }
1106
1107       /* Check if any ImportantDep() (but not Critical) were added
1108        * since we installed the package.  Also check for deps that
1109        * were satisfied in the past: for instance, if a version
1110        * restriction in a Recommends was tightened, upgrading the
1111        * package should follow that Recommends rather than causing the
1112        * dependency to be removed. (bug #470115)
1113        */
1114       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1115       {
1116          bool isNewImportantDep = true;
1117          bool isPreviouslySatisfiedImportantDep = false;
1118          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1119          {
1120             //FIXME: Should we handle or-group better here?
1121             // We do not check if the package we look for is part of the same or-group
1122             // we might find while searching, but could that really be a problem?
1123             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1124                 Start.TargetPkg() != D.TargetPkg())
1125                continue;
1126
1127             isNewImportantDep = false;
1128
1129             while ((D->CompareOp & Dep::Or) != 0)
1130                ++D;
1131
1132             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1133             if (isPreviouslySatisfiedImportantDep == true)
1134                break;
1135          }
1136
1137          if(isNewImportantDep == true)
1138          {
1139             if (DebugAutoInstall == true)
1140                std::clog << OutputInDepth(Depth) << "new important dependency: "
1141                          << Start.TargetPkg().FullName() << std::endl;
1142          }
1143          else if(isPreviouslySatisfiedImportantDep == true)
1144          {
1145             if (DebugAutoInstall == true)
1146                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1147                          << Start.TargetPkg().FullName() << std::endl;
1148          }
1149          else
1150          {
1151             if (DebugAutoInstall == true)
1152                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1153                          << Start.TargetPkg().FullName() << std::endl;
1154             continue;
1155          }
1156       }
1157
1158       /* This bit is for processing the possibilty of an install/upgrade
1159          fixing the problem for "positive" dependencies */
1160       if (Start.IsNegative() == false && (DepState[Start->ID] & DepCVer) == DepCVer)
1161       {
1162          APT::VersionList verlist;
1163          pkgCache::VerIterator Cand = PkgState[Start.TargetPkg()->ID].CandidateVerIter(*this);
1164          if (Cand.end() == false && VS().CheckDep(Cand.VerStr(), Start->CompareOp, Start.TargetVer()) == true)
1165             verlist.insert(Cand);
1166          for (PrvIterator Prv = Start.TargetPkg().ProvidesList(); Prv.end() != true; ++Prv)
1167          {
1168             pkgCache::VerIterator V = Prv.OwnerVer();
1169             pkgCache::VerIterator Cand = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1170             if (Cand.end() == true || V != Cand ||
1171                 VS().CheckDep(Prv.ProvideVersion(), Start->CompareOp, Start.TargetVer()) == false)
1172                continue;
1173             verlist.insert(Cand);
1174          }
1175          CompareProviders comp(Start);
1176          APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1177
1178          if (InstVer != verlist.end())
1179          {
1180             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1181             if(DebugAutoInstall == true)
1182                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1183                          << " as " << Start.DepType() << " of " << Pkg.Name()
1184                          << std::endl;
1185             MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps);
1186             // now check if we should consider it a automatic dependency or not
1187             if(InstPkg->CurrentVer == 0 && Pkg->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
1188             {
1189                if(DebugAutoInstall == true)
1190                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1191                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1192                MarkAuto(InstPkg, false);
1193             }
1194          }
1195          continue;
1196       }
1197       /* Negative dependencies have no or-group
1198          If the dependency isn't versioned, we try if an upgrade might solve the problem.
1199          Otherwise we remove the offender if needed */
1200       else if (Start.IsNegative() == true && Start->Type != pkgCache::Dep::Obsoletes)
1201       {
1202          SPtrArray<Version *> List = Start.AllTargets();
1203          pkgCache::PkgIterator TrgPkg = Start.TargetPkg();
1204          for (Version **I = List; *I != 0; I++)
1205          {
1206             VerIterator Ver(*this,*I);
1207             PkgIterator Pkg = Ver.ParentPkg();
1208
1209             /* The List includes all packages providing this dependency,
1210                even providers which are not installed, so skip them. */
1211             if (PkgState[Pkg->ID].InstallVer == 0)
1212                continue;
1213
1214             if ((Start->Version != 0 || TrgPkg != Pkg) &&
1215                 PkgState[Pkg->ID].CandidateVer != PkgState[Pkg->ID].InstallVer &&
1216                 PkgState[Pkg->ID].CandidateVer != *I &&
1217                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1218                continue;
1219             else if ((Start->Type == pkgCache::Dep::Conflicts || Start->Type == pkgCache::Dep::DpkgBreaks) &&
1220                      MarkDelete(Pkg,false,Depth + 1, false) == false)
1221                break;
1222          }
1223          continue;
1224       }
1225    }
1226
1227    return Dep.end() == true;
1228 }
1229                                                                         /*}}}*/
1230 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1231 // ---------------------------------------------------------------------
1232 /* The default implementation does nothing.
1233    dpkg holds are enforced by the private IsModeChangeOk */
1234 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1235                               unsigned long Depth, bool FromUser)
1236 {
1237    return true;
1238 }
1239                                                                         /*}}}*/
1240 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1241 // ---------------------------------------------------------------------
1242 /* */
1243 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1244 {
1245    if (unlikely(Pkg.end() == true))
1246       return;
1247
1248    APT::PackageList pkglist;
1249    if (Pkg->CurrentVer != 0 &&
1250        (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1251    {
1252       pkgCache::GrpIterator Grp = Pkg.Group();
1253       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1254       {
1255          if (P->CurrentVer != 0)
1256             pkglist.insert(P);
1257       }
1258    }
1259    else
1260       pkglist.insert(Pkg);
1261
1262    ActionGroup group(*this);
1263
1264    for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
1265    {
1266       RemoveSizes(Pkg);
1267       RemoveStates(Pkg);
1268
1269       StateCache &P = PkgState[Pkg->ID];
1270       if (To == true)
1271          P.iFlags |= ReInstall;
1272       else
1273          P.iFlags &= ~ReInstall;
1274
1275       AddStates(Pkg);
1276       AddSizes(Pkg);
1277    }
1278 }
1279                                                                         /*}}}*/
1280 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1281 // ---------------------------------------------------------------------
1282 /* */
1283 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1284 {
1285    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1286    StateCache &P = PkgState[Pkg->ID];
1287
1288    if (P.CandidateVer == TargetVer)
1289       return;
1290
1291    ActionGroup group(*this);
1292
1293    RemoveSizes(Pkg);
1294    RemoveStates(Pkg);
1295
1296    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1297       P.InstallVer = (Version *)TargetVer;
1298    P.CandidateVer = (Version *)TargetVer;
1299    P.Update(Pkg,*this);
1300
1301    AddStates(Pkg);
1302    Update(Pkg);
1303    AddSizes(Pkg);
1304
1305 }
1306                                                                         /*}}}*/
1307 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1308 // ---------------------------------------------------------------------
1309 /* changes the candidate of a package and walks over all its dependencies
1310    to check if it needs to change the candidate of the dependency, too,
1311    to reach a installable versionstate */
1312 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1313                                         std::string const &TargetRel)
1314 {
1315    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1316    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1317 }
1318 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1319                                         std::string const &TargetRel,
1320                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1321 {
1322    ActionGroup group(*this);
1323    SetCandidateVersion(TargetVer);
1324
1325    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1326       return true;
1327
1328    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1329    // save the position of the last element we will not undo - if we have to
1330    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1331
1332    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1333    {
1334       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1335           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1336            IsImportantDep(D) == false))
1337          continue;
1338
1339       // walk over an or-group and check if we need to do anything
1340       // for simpilicity no or-group is handled as a or-group including one dependency
1341       pkgCache::DepIterator Start = D;
1342       bool itsFine = false;
1343       for (bool stillOr = true; stillOr == true; ++Start)
1344       {
1345          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1346          pkgCache::PkgIterator const P = Start.TargetPkg();
1347          // virtual packages can't be a solution
1348          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1349             continue;
1350          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1351          // no versioned dependency - but is it installable?
1352          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1353          {
1354             // Check if one of the providers is installable
1355             if (P->ProvidesList != 0)
1356             {
1357                pkgCache::PrvIterator Prv = P.ProvidesList();
1358                for (; Prv.end() == false; ++Prv)
1359                {
1360                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1361                   if (C.end() == true || C != Prv.OwnerVer() ||
1362                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1363                      continue;
1364                   break;
1365                }
1366                if (Prv.end() == true)
1367                   continue;
1368             }
1369             // no providers, so check if we have an installable candidate version
1370             else if (Cand.end() == true ||
1371                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1372                continue;
1373             itsFine = true;
1374             break;
1375          }
1376          if (Cand.end() == true)
1377             continue;
1378          // check if the current candidate is enough for the versioned dependency - and installable?
1379          if (VS().CheckDep(P.CandVersion(), Start->CompareOp, Start.TargetVer()) == true &&
1380              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1381          {
1382             itsFine = true;
1383             break;
1384          }
1385       }
1386
1387       if (itsFine == true) {
1388          // something in the or-group was fine, skip all other members
1389          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1390          continue;
1391       }
1392
1393       // walk again over the or-group and check each if a candidate switch would help
1394       itsFine = false;
1395       for (bool stillOr = true; stillOr == true; ++D)
1396       {
1397          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1398          // changing candidate will not help if the dependency is not versioned
1399          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1400          {
1401             if (stillOr == true)
1402                continue;
1403             break;
1404          }
1405
1406          pkgCache::VerIterator V;
1407          if (TargetRel == "newest")
1408             V = D.TargetPkg().VersionList();
1409          else
1410             V = Match.Find(D.TargetPkg());
1411
1412          // check if the version from this release could satisfy the dependency
1413          if (V.end() == true || VS().CheckDep(V.VerStr(), D->CompareOp, D.TargetVer()) == false)
1414          {
1415             if (stillOr == true)
1416                continue;
1417             break;
1418          }
1419
1420          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1421          if (V == oldCand)
1422          {
1423             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1424             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1425                  c != Changed.end(); ++c)
1426             {
1427                if (c->first->ParentPkg != V->ParentPkg)
1428                   continue;
1429                itsFine = true;
1430                break;
1431             }
1432          }
1433
1434          if (itsFine == false)
1435          {
1436             // change the candidate
1437             Changed.push_back(make_pair(oldCand, TargetVer));
1438             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1439             {
1440                if (stillOr == false)
1441                   break;
1442                // undo the candidate changing
1443                SetCandidateVersion(oldCand);
1444                Changed.pop_back();
1445                continue;
1446             }
1447             itsFine = true;
1448          }
1449
1450          // something in the or-group was fine, skip all other members
1451          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1452          break;
1453       }
1454
1455       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1456       {
1457          // undo all changes which aren't lead to a solution
1458          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1459               c != Changed.end(); ++c)
1460             SetCandidateVersion(c->first);
1461          Changed.erase(newChanged, Changed.end());
1462          return false;
1463       }
1464    }
1465    return true;
1466 }
1467                                                                         /*}}}*/
1468 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1469 // ---------------------------------------------------------------------
1470 /* */
1471 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1472 {
1473   StateCache &state = PkgState[Pkg->ID];
1474
1475   ActionGroup group(*this);
1476
1477   if(Auto)
1478     state.Flags |= Flag::Auto;
1479   else
1480     state.Flags &= ~Flag::Auto;
1481 }
1482                                                                         /*}}}*/
1483 // StateCache::Update - Compute the various static display things       /*{{{*/
1484 // ---------------------------------------------------------------------
1485 /* This is called whenever the Candidate version changes. */
1486 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1487 {
1488    // Some info
1489    VerIterator Ver = CandidateVerIter(Cache);
1490
1491    // Use a null string or the version string
1492    if (Ver.end() == true)
1493       CandVersion = "";
1494    else
1495       CandVersion = Ver.VerStr();
1496
1497    // Find the current version
1498    CurVersion = "";
1499    if (Pkg->CurrentVer != 0)
1500       CurVersion = Pkg.CurrentVer().VerStr();
1501
1502    // Strip off the epochs for display
1503    CurVersion = StripEpoch(CurVersion);
1504    CandVersion = StripEpoch(CandVersion);
1505
1506    // Figure out if its up or down or equal
1507    Status = Ver.CompareVer(Pkg.CurrentVer());
1508    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1509      Status = 2;
1510 }
1511                                                                         /*}}}*/
1512 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1513 // ---------------------------------------------------------------------
1514 /* */
1515 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1516 {
1517    if (Ver == 0)
1518       return 0;
1519
1520    // Strip any epoch
1521    for (const char *I = Ver; *I != 0; I++)
1522       if (*I == ':')
1523          return I + 1;
1524    return Ver;
1525 }
1526                                                                         /*}}}*/
1527 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1528 // ---------------------------------------------------------------------
1529 /* The default just returns the highest available version that is not
1530    a source and automatic. */
1531 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1532 {
1533    /* Not source/not automatic versions cannot be a candidate version
1534       unless they are already installed */
1535    VerIterator Last(*(pkgCache *)this,0);
1536
1537    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1538    {
1539       if (Pkg.CurrentVer() == I)
1540          return I;
1541
1542       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1543       {
1544          if ((J.File()->Flags & Flag::NotSource) != 0)
1545             continue;
1546
1547          /* Stash the highest version of a not-automatic source, we use it
1548             if there is nothing better */
1549          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1550              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1551          {
1552             if (Last.end() == true)
1553                Last = I;
1554             continue;
1555          }
1556
1557          return I;
1558       }
1559    }
1560
1561    return Last;
1562 }
1563                                                                         /*}}}*/
1564 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1565 // ---------------------------------------------------------------------
1566 /* */
1567 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1568 {
1569    if(Dep.IsCritical())
1570       return true;
1571    else if(Dep->Type == pkgCache::Dep::Recommends)
1572    {
1573       if (InstallRecommends)
1574          return true;
1575       // we suport a special mode to only install-recommends for certain
1576       // sections
1577       // FIXME: this is a meant as a temporarly solution until the
1578       //        recommends are cleaned up
1579       const char *sec = Dep.ParentVer().Section();
1580       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1581          return true;
1582    }
1583    else if(Dep->Type == pkgCache::Dep::Suggests)
1584       return InstallSuggests;
1585
1586    return false;
1587 }
1588                                                                         /*}}}*/
1589 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1590 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &Pkg)
1591 { return 0; };
1592 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &File)
1593 { return 0; };
1594                                                                         /*}}}*/
1595 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1596 {
1597   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1598   if(f->wasConstructedSuccessfully())
1599     return f;
1600   else
1601     {
1602       delete f;
1603       return NULL;
1604     }
1605 }
1606                                                                         /*}}}*/
1607 bool pkgDepCache::MarkFollowsRecommends()
1608 {
1609   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1610 }
1611
1612 bool pkgDepCache::MarkFollowsSuggests()
1613 {
1614   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1615 }
1616
1617 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1618 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1619 {
1620    if (_config->Find("APT::Solver", "internal") != "internal")
1621       return true;
1622
1623    bool follow_recommends;
1624    bool follow_suggests;
1625    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1626
1627    // init the states
1628    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1629    {
1630       PkgState[p->ID].Marked  = false;
1631       PkgState[p->ID].Garbage = false;
1632
1633       // debug output
1634       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1635          std::clog << "AutoDep: " << p.FullName() << std::endl;
1636    }
1637
1638    // init vars
1639    follow_recommends = MarkFollowsRecommends();
1640    follow_suggests   = MarkFollowsSuggests();
1641
1642
1643
1644    // do the mark part, this is the core bit of the algorithm
1645    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1646    {
1647       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1648           (p->Flags & Flag::Essential) ||
1649           (p->Flags & Flag::Important) ||
1650           userFunc.InRootSet(p) ||
1651           // be nice even then a required package violates the policy (#583517)
1652           // and do the full mark process also for required packages
1653           (p.CurrentVer().end() != true &&
1654            p.CurrentVer()->Priority == pkgCache::State::Required))
1655       {
1656          // the package is installed (and set to keep)
1657          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1658             MarkPackage(p, p.CurrentVer(),
1659                         follow_recommends, follow_suggests);
1660          // the package is to be installed
1661          else if(PkgState[p->ID].Install())
1662             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1663                         follow_recommends, follow_suggests);
1664       }
1665    }
1666
1667    return true;
1668 }
1669                                                                         /*}}}*/
1670 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1671 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1672                               const pkgCache::VerIterator &ver,
1673                               bool const &follow_recommends,
1674                               bool const &follow_suggests)
1675 {
1676    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1677
1678    // if we are marked already we are done
1679    if(state.Marked)
1680       return;
1681
1682    VerIterator const currver = pkg.CurrentVer();
1683    VerIterator const instver = state.InstVerIter(*this);
1684
1685 #if 0
1686    VerIterator const candver = state.CandidateVerIter(*this);
1687
1688    // If a package was garbage-collected but is now being marked, we
1689    // should re-select it
1690    // For cases when a pkg is set to upgrade and this trigger the
1691    // removal of a no-longer used dependency.  if the pkg is set to
1692    // keep again later it will result in broken deps
1693    if(state.Delete() && state.RemoveReason = Unused)
1694    {
1695       if(ver==candver)
1696          mark_install(pkg, false, false, NULL);
1697       else if(ver==pkg.CurrentVer())
1698          MarkKeep(pkg, false, false);
1699
1700       instver=state.InstVerIter(*this);
1701    }
1702 #endif
1703
1704    // For packages that are not going to be removed, ignore versions
1705    // other than the InstVer.  For packages that are going to be
1706    // removed, ignore versions other than the current version.
1707    if(!(ver == instver && !instver.end()) &&
1708       !(ver == currver && instver.end() && !ver.end()))
1709       return;
1710
1711    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1712
1713    if(debug_autoremove)
1714      {
1715        std::clog << "Marking: " << pkg.FullName();
1716        if(!ver.end())
1717          std::clog << " " << ver.VerStr();
1718        if(!currver.end())
1719          std::clog << ", Curr=" << currver.VerStr();
1720        if(!instver.end())
1721          std::clog << ", Inst=" << instver.VerStr();
1722        std::clog << std::endl;
1723      }
1724
1725    state.Marked=true;
1726
1727    if(ver.end() == true)
1728       return;
1729
1730      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1731      {
1732         if(d->Type == Dep::Depends ||
1733            d->Type == Dep::PreDepends ||
1734            (follow_recommends &&
1735             d->Type == Dep::Recommends) ||
1736            (follow_suggests &&
1737             d->Type == Dep::Suggests))
1738         {
1739            // Try all versions of this package.
1740            for(VerIterator V = d.TargetPkg().VersionList();
1741                !V.end(); ++V)
1742            {
1743               if(_system->VS->CheckDep(V.VerStr(), d->CompareOp, d.TargetVer()))
1744               {
1745                 if(debug_autoremove)
1746                   {
1747                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1748                               << " " << d.ParentVer().VerStr() << " "
1749                               << d.DepType() << " " << d.TargetPkg().FullName();
1750                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1751                       {
1752                         std::clog << " (" << d.CompType() << " "
1753                                   << d.TargetVer() << ")";
1754                       }
1755                     std::clog << std::endl;
1756                   }
1757                  MarkPackage(V.ParentPkg(), V,
1758                              follow_recommends, follow_suggests);
1759               }
1760            }
1761            // Now try virtual packages
1762            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1763                !prv.end(); ++prv)
1764            {
1765               if(_system->VS->CheckDep(prv.ProvideVersion(), d->CompareOp,
1766                                        d.TargetVer()))
1767               {
1768                 if(debug_autoremove)
1769                   {
1770                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1771                               << d.ParentVer().VerStr() << " "
1772                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1773                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1774                       {
1775                         std::clog << " (" << d.CompType() << " "
1776                                   << d.TargetVer() << ")";
1777                       }
1778                     std::clog << ", provided by "
1779                               << prv.OwnerPkg().FullName() << " "
1780                               << prv.OwnerVer().VerStr()
1781                               << std::endl;
1782                   }
1783
1784                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1785                              follow_recommends, follow_suggests);
1786               }
1787            }
1788         }
1789      }
1790 }
1791                                                                         /*}}}*/
1792 bool pkgDepCache::Sweep()                                               /*{{{*/
1793 {
1794    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1795
1796    // do the sweep
1797    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1798    {
1799      StateCache &state=PkgState[p->ID];
1800
1801      // skip required packages
1802      if (!p.CurrentVer().end() &&
1803          (p.CurrentVer()->Priority == pkgCache::State::Required))
1804         continue;
1805
1806      // if it is not marked and it is installed, it's garbage
1807      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1808      {
1809         state.Garbage=true;
1810         if(debug_autoremove)
1811            std::clog << "Garbage: " << p.FullName() << std::endl;
1812      }
1813   }
1814
1815    return true;
1816 }
1817                                                                         /*}}}*/