apt-pkg/depcache.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: depcache.cc,v 1.25 2001/05/27 05:36:04 jgg Exp $
   4 /* ######################################################################
   5
   6    Dependency Cache - Caches Dependency information.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include<config.h>
  12
  13 #include <apt-pkg/depcache.h>
  14 #include <apt-pkg/version.h>
  15 #include <apt-pkg/versionmatch.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/sptr.h>
  18 #include <apt-pkg/algorithms.h>
  19 #include <apt-pkg/fileutl.h>
  20 #include <apt-pkg/strutl.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/aptconfiguration.h>
  23 #include <apt-pkg/pkgsystem.h>
  24 #include <apt-pkg/tagfile.h>
  25 #include <apt-pkg/progress.h>
  26 #include <apt-pkg/cacheset.h>
  27
  28 #include <algorithm>
  29 #include <iostream>
  30 #include <sstream>
  31 #include <set>
  32
  33 #include <sys/stat.h>
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37
  38 using std::string;
  39
  40 // helper for Install-Recommends-Sections and Never-MarkAuto-Sections   /*{{{*/
  41 static bool
  42 ConfigValueInSubTree(const char* SubTree, const char *needle)
  43 {
  44    Configuration::Item const *Opts;
  45    Opts = _config->Tree(SubTree);
  46    if (Opts != 0 && Opts->Child != 0)
  47    {
  48       Opts = Opts->Child;
  49       for (; Opts != 0; Opts = Opts->Next)
  50       {
  51          if (Opts->Value.empty() == true)
  52             continue;
  53          if (strcmp(needle, Opts->Value.c_str()) == 0)
  54             return true;
  55       }
  56    }
  57    return false;
  58 }
  59                                                                         /*}}}*/
  60 pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :             /*{{{*/
  61   cache(cache), released(false)
  62 {
  63   ++cache.group_level;
  64 }
  65
  66 void pkgDepCache::ActionGroup::release()
  67 {
  68   if(!released)
  69     {
  70       if(cache.group_level == 0)
  71         std::cerr << "W: Unbalanced action groups, expect badness" << std::endl;
  72       else
  73         {
  74           --cache.group_level;
  75
  76           if(cache.group_level == 0)
  77             cache.MarkAndSweep();
  78         }
  79
  80       released = true;
  81     }
  82 }
  83
  84 pkgDepCache::ActionGroup::~ActionGroup()
  85 {
  86   release();
  87 }
  88                                                                         /*}}}*/
  89 // DepCache::pkgDepCache - Constructors                                 /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 pkgDepCache::pkgDepCache(pkgCache *pCache,Policy *Plcy) :
  93   group_level(0), Cache(pCache), PkgState(0), DepState(0)
  94 {
  95    DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
  96    DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
  97    delLocalPolicy = 0;
  98    LocalPolicy = Plcy;
  99    if (LocalPolicy == 0)
 100       delLocalPolicy = LocalPolicy = new Policy;
 101 }
 102                                                                         /*}}}*/
 103 // DepCache::~pkgDepCache - Destructor                                  /*{{{*/
 104 // ---------------------------------------------------------------------
 105 /* */
 106 pkgDepCache::~pkgDepCache()
 107 {
 108    delete [] PkgState;
 109    delete [] DepState;
 110    delete delLocalPolicy;
 111 }
 112                                                                         /*}}}*/
 113 // DepCache::Init - Generate the initial extra structures.              /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* This allocats the extension buffers and initializes them. */
 116 bool pkgDepCache::Init(OpProgress *Prog)
 117 {
 118    // Suppress mark updates during this operation (just in case) and
 119    // run a mark operation when Init terminates.
 120    ActionGroup actions(*this);
 121
 122    delete [] PkgState;
 123    delete [] DepState;
 124    PkgState = new StateCache[Head().PackageCount];
 125    DepState = new unsigned char[Head().DependsCount];
 126    memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
 127    memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
 128
 129    if (Prog != 0)
 130    {
 131       Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
 132                             _("Building dependency tree"));
 133       Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
 134    }
 135
 136    /* Set the current state of everything. In this state all of the
 137       packages are kept exactly as is. See AllUpgrade */
 138    int Done = 0;
 139    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 140    {
 141       if (Prog != 0 && Done%20 == 0)
 142          Prog->Progress(Done);
 143
 144       // Find the proper cache slot
 145       StateCache &State = PkgState[I->ID];
 146       State.iFlags = 0;
 147
 148       // Figure out the install version
 149       State.CandidateVer = GetCandidateVer(I);
 150       State.InstallVer = I.CurrentVer();
 151       State.Mode = ModeKeep;
 152
 153       State.Update(I,*this);
 154    }
 155
 156    if (Prog != 0)
 157    {
 158
 159       Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
 160                             Head().PackageCount,
 161                             _("Building dependency tree"));
 162       Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
 163    }
 164
 165    Update(Prog);
 166
 167    if(Prog != 0)
 168       Prog->Done();
 169
 170    return true;
 171 }
 172                                                                         /*}}}*/
 173 bool pkgDepCache::readStateFile(OpProgress *Prog)                       /*{{{*/
 174 {
 175    FileFd state_file;
 176    string const state = _config->FindFile("Dir::State::extended_states");
 177    if(RealFileExists(state)) {
 178       state_file.Open(state, FileFd::ReadOnly);
 179       off_t const file_size = state_file.Size();
 180       if(Prog != NULL)
 181          Prog->OverallProgress(0, file_size, 1,
 182                                _("Reading state information"));
 183
 184       pkgTagFile tagfile(&state_file);
 185       pkgTagSection section;
 186       off_t amt = 0;
 187       bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 188       while(tagfile.Step(section)) {
 189          string const pkgname = section.FindS("Package");
 190          string pkgarch = section.FindS("Architecture");
 191          if (pkgarch.empty() == true)
 192             pkgarch = "any";
 193          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 194          // Silently ignore unknown packages and packages with no actual version.
 195          if(pkg.end() == true || pkg->VersionList == 0)
 196             continue;
 197
 198          short const reason = section.FindI("Auto-Installed", 0);
 199          if(reason > 0)
 200          {
 201             PkgState[pkg->ID].Flags |= Flag::Auto;
 202             if (unlikely(debug_autoremove))
 203                std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
 204             if (pkgarch == "any")
 205             {
 206                pkgCache::GrpIterator G = pkg.Group();
 207                for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
 208                   if (pkg->VersionList != 0)
 209                      PkgState[pkg->ID].Flags |= Flag::Auto;
 210             }
 211          }
 212          amt += section.size();
 213          if(Prog != NULL)
 214             Prog->OverallProgress(amt, file_size, 1,
 215                                   _("Reading state information"));
 216       }
 217       if(Prog != NULL)
 218          Prog->OverallProgress(file_size, file_size, 1,
 219                                _("Reading state information"));
 220    }
 221
 222    return true;
 223 }
 224                                                                         /*}}}*/
 225 bool pkgDepCache::writeStateFile(OpProgress *prog, bool InstalledOnly)  /*{{{*/
 226 {
 227    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 228
 229    if(debug_autoremove)
 230       std::clog << "pkgDepCache::writeStateFile()" << std::endl;
 231
 232    FileFd StateFile;
 233    string const state = _config->FindFile("Dir::State::extended_states");
 234
 235    // if it does not exist, create a empty one
 236    if(!RealFileExists(state))
 237    {
 238       StateFile.Open(state, FileFd::WriteAtomic);
 239       StateFile.Close();
 240    }
 241
 242    // open it
 243    if(!StateFile.Open(state, FileFd::ReadOnly))
 244       return _error->Error(_("Failed to open StateFile %s"),
 245                            state.c_str());
 246
 247    FILE *OutFile;
 248    string const outfile = state + ".tmp";
 249    if((OutFile = fopen(outfile.c_str(),"w")) == NULL)
 250       return _error->Error(_("Failed to write temporary StateFile %s"),
 251                            outfile.c_str());
 252
 253    // first merge with the existing sections
 254    pkgTagFile tagfile(&StateFile);
 255    pkgTagSection section;
 256    std::set<string> pkgs_seen;
 257    const char *nullreorderlist[] = {0};
 258    while(tagfile.Step(section)) {
 259          string const pkgname = section.FindS("Package");
 260          string pkgarch = section.FindS("Architecture");
 261          if (pkgarch.empty() == true)
 262             pkgarch = "native";
 263          // Silently ignore unknown packages and packages with no actual
 264          // version.
 265          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 266          if(pkg.end() || pkg.VersionList().end())
 267             continue;
 268          StateCache const &P = PkgState[pkg->ID];
 269          bool newAuto = (P.Flags & Flag::Auto);
 270          // skip not installed or now-removed ones if requested
 271          if (InstalledOnly && (
 272              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 273              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 274          {
 275             // The section is obsolete if it contains no other tag
 276             unsigned int const count = section.Count();
 277             if (count < 2 ||
 278                 (count == 2 && section.Exists("Auto-Installed")) ||
 279                 (count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
 280                continue;
 281             else
 282                newAuto = false;
 283          }
 284          if(_config->FindB("Debug::pkgAutoRemove",false))
 285             std::clog << "Update existing AutoInstall info: "
 286                       << pkg.FullName() << std::endl;
 287          TFRewriteData rewrite[3];
 288          rewrite[0].Tag = "Architecture";
 289          rewrite[0].Rewrite = pkg.Arch();
 290          rewrite[0].NewTag = 0;
 291          rewrite[1].Tag = "Auto-Installed";
 292          rewrite[1].Rewrite = newAuto ? "1" : "0";
 293          rewrite[1].NewTag = 0;
 294          rewrite[2].Tag = 0;
 295          TFRewrite(OutFile, section, nullreorderlist, rewrite);
 296          fprintf(OutFile,"\n");
 297          pkgs_seen.insert(pkg.FullName());
 298    }
 299
 300    // then write the ones we have not seen yet
 301    std::ostringstream ostr;
 302    for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); ++pkg) {
 303       StateCache const &P = PkgState[pkg->ID];
 304       if(P.Flags & Flag::Auto) {
 305          if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
 306             if(debug_autoremove)
 307                std::clog << "Skipping already written " << pkg.FullName() << std::endl;
 308             continue;
 309          }
 310          // skip not installed ones if requested
 311          if (InstalledOnly && (
 312              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 313              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 314             continue;
 315          const char* const pkgarch = pkg.Arch();
 316          if (strcmp(pkgarch, "all") == 0)
 317             continue;
 318          if(debug_autoremove)
 319             std::clog << "Writing new AutoInstall: " << pkg.FullName() << std::endl;
 320          ostr.str(string(""));
 321          ostr << "Package: " << pkg.Name()
 322               << "\nArchitecture: " << pkgarch
 323               << "\nAuto-Installed: 1\n\n";
 324          fprintf(OutFile,"%s",ostr.str().c_str());
 325       }
 326    }
 327    fclose(OutFile);
 328
 329    // move the outfile over the real file and set permissions
 330    rename(outfile.c_str(), state.c_str());
 331    chmod(state.c_str(), 0644);
 332
 333    return true;
 334 }
 335                                                                         /*}}}*/
 336 // DepCache::CheckDep - Checks a single dependency                      /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /* This first checks the dependency against the main target package and
 339    then walks along the package provides list and checks if each provides
 340    will be installed then checks the provides against the dep. Res will be
 341    set to the package which was used to satisfy the dep. */
 342 bool pkgDepCache::CheckDep(DepIterator Dep,int Type,PkgIterator &Res)
 343 {
 344    Res = Dep.TargetPkg();
 345
 346    /* Check simple depends. A depends -should- never self match but
 347       we allow it anyhow because dpkg does. Technically it is a packaging
 348       bug. Conflicts may never self match */
 349    if (Dep.TargetPkg() != Dep.ParentPkg() || Dep.IsNegative() == false)
 350    {
 351       PkgIterator Pkg = Dep.TargetPkg();
 352       // Check the base package
 353       if (Type == NowVersion && Pkg->CurrentVer != 0)
 354          if (VS().CheckDep(Pkg.CurrentVer().VerStr(),Dep->CompareOp,
 355                                  Dep.TargetVer()) == true)
 356             return true;
 357
 358       if (Type == InstallVersion && PkgState[Pkg->ID].InstallVer != 0)
 359          if (VS().CheckDep(PkgState[Pkg->ID].InstVerIter(*this).VerStr(),
 360                                  Dep->CompareOp,Dep.TargetVer()) == true)
 361             return true;
 362
 363       if (Type == CandidateVersion && PkgState[Pkg->ID].CandidateVer != 0)
 364          if (VS().CheckDep(PkgState[Pkg->ID].CandidateVerIter(*this).VerStr(),
 365                                  Dep->CompareOp,Dep.TargetVer()) == true)
 366             return true;
 367    }
 368
 369    if (Dep->Type == Dep::Obsoletes)
 370       return false;
 371
 372    // Check the providing packages
 373    PrvIterator P = Dep.TargetPkg().ProvidesList();
 374    for (; P.end() != true; ++P)
 375    {
 376       if (Dep.IsIgnorable(P) == true)
 377          continue;
 378
 379       // Check if the provides is a hit
 380       if (Type == NowVersion)
 381       {
 382          if (P.OwnerPkg().CurrentVer() != P.OwnerVer())
 383             continue;
 384       }
 385
 386       if (Type == InstallVersion)
 387       {
 388          StateCache &State = PkgState[P.OwnerPkg()->ID];
 389          if (State.InstallVer != (Version *)P.OwnerVer())
 390             continue;
 391       }
 392
 393       if (Type == CandidateVersion)
 394       {
 395          StateCache &State = PkgState[P.OwnerPkg()->ID];
 396          if (State.CandidateVer != (Version *)P.OwnerVer())
 397             continue;
 398       }
 399
 400       // Compare the versions.
 401       if (VS().CheckDep(P.ProvideVersion(),Dep->CompareOp,Dep.TargetVer()) == true)
 402       {
 403          Res = P.OwnerPkg();
 404          return true;
 405       }
 406    }
 407
 408    return false;
 409 }
 410                                                                         /*}}}*/
 411 // DepCache::AddSizes - Add the packages sizes to the counters          /*{{{*/
 412 // ---------------------------------------------------------------------
 413 /* Call with Inverse = true to preform the inverse opration */
 414 void pkgDepCache::AddSizes(const PkgIterator &Pkg, bool const Inverse)
 415 {
 416    StateCache &P = PkgState[Pkg->ID];
 417
 418    if (Pkg->VersionList == 0)
 419       return;
 420
 421    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 422        P.Keep() == true)
 423       return;
 424
 425    // Compute the size data
 426    if (P.NewInstall() == true)
 427    {
 428       if (Inverse == false) {
 429          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 430          iDownloadSize += P.InstVerIter(*this)->Size;
 431       } else {
 432          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 433          iDownloadSize -= P.InstVerIter(*this)->Size;
 434       }
 435       return;
 436    }
 437
 438    // Upgrading
 439    if (Pkg->CurrentVer != 0 &&
 440        (P.InstallVer != (Version *)Pkg.CurrentVer() ||
 441         (P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
 442    {
 443       if (Inverse == false) {
 444          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 445          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 446          iDownloadSize += P.InstVerIter(*this)->Size;
 447       } else {
 448          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 449          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 450          iDownloadSize -= P.InstVerIter(*this)->Size;
 451       }
 452       return;
 453    }
 454
 455    // Reinstall
 456    if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
 457        P.Delete() == false)
 458    {
 459       if (Inverse == false)
 460          iDownloadSize += P.InstVerIter(*this)->Size;
 461       else
 462          iDownloadSize -= P.InstVerIter(*this)->Size;
 463       return;
 464    }
 465
 466    // Removing
 467    if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
 468    {
 469       if (Inverse == false)
 470          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 471       else
 472          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 473       return;
 474    }
 475 }
 476                                                                         /*}}}*/
 477 // DepCache::AddStates - Add the package to the state counter           /*{{{*/
 478 // ---------------------------------------------------------------------
 479 /* This routine is tricky to use, you must make sure that it is never
 480    called twice for the same package. This means the Remove/Add section
 481    should be as short as possible and not encompass any code that will
 482    calld Remove/Add itself. Remember, dependencies can be circular so
 483    while processing a dep for Pkg it is possible that Add/Remove
 484    will be called on Pkg */
 485 void pkgDepCache::AddStates(const PkgIterator &Pkg, bool const Invert)
 486 {
 487    signed char const Add = (Invert == false) ? 1 : -1;
 488    StateCache &State = PkgState[Pkg->ID];
 489
 490    // The Package is broken (either minimal dep or policy dep)
 491    if ((State.DepState & DepInstMin) != DepInstMin)
 492       iBrokenCount += Add;
 493    if ((State.DepState & DepInstPolicy) != DepInstPolicy)
 494       iPolicyBrokenCount += Add;
 495
 496    // Bad state
 497    if (Pkg.State() != PkgIterator::NeedsNothing)
 498       iBadCount += Add;
 499
 500    // Not installed
 501    if (Pkg->CurrentVer == 0)
 502    {
 503       if (State.Mode == ModeDelete &&
 504           (State.iFlags & Purge) == Purge && Pkg.Purge() == false)
 505          iDelCount += Add;
 506
 507       if (State.Mode == ModeInstall)
 508          iInstCount += Add;
 509       return;
 510    }
 511
 512    // Installed, no upgrade
 513    if (State.Status == 0)
 514    {
 515       if (State.Mode == ModeDelete)
 516          iDelCount += Add;
 517       else
 518          if ((State.iFlags & ReInstall) == ReInstall)
 519             iInstCount += Add;
 520
 521       return;
 522    }
 523
 524    // Alll 3 are possible
 525    if (State.Mode == ModeDelete)
 526       iDelCount += Add;
 527    if (State.Mode == ModeKeep)
 528       iKeepCount += Add;
 529    if (State.Mode == ModeInstall)
 530       iInstCount += Add;
 531 }
 532                                                                         /*}}}*/
 533 // DepCache::BuildGroupOrs - Generate the Or group dep data             /*{{{*/
 534 // ---------------------------------------------------------------------
 535 /* The or group results are stored in the last item of the or group. This
 536    allows easy detection of the state of a whole or'd group. */
 537 void pkgDepCache::BuildGroupOrs(VerIterator const &V)
 538 {
 539    unsigned char Group = 0;
 540
 541    for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 542    {
 543       // Build the dependency state.
 544       unsigned char &State = DepState[D->ID];
 545
 546       /* Invert for Conflicts. We have to do this twice to get the
 547          right sense for a conflicts group */
 548       if (D.IsNegative() == true)
 549          State = ~State;
 550
 551       // Add to the group if we are within an or..
 552       State &= 0x7;
 553       Group |= State;
 554       State |= Group << 3;
 555       if ((D->CompareOp & Dep::Or) != Dep::Or)
 556          Group = 0;
 557
 558       // Invert for Conflicts
 559       if (D.IsNegative() == true)
 560          State = ~State;
 561    }
 562 }
 563                                                                         /*}}}*/
 564 // DepCache::VersionState - Perform a pass over a dependency list       /*{{{*/
 565 // ---------------------------------------------------------------------
 566 /* This is used to run over a dependency list and determine the dep
 567    state of the list, filtering it through both a Min check and a Policy
 568    check. The return result will have SetMin/SetPolicy low if a check
 569    fails. It uses the DepState cache for it's computations. */
 570 unsigned char pkgDepCache::VersionState(DepIterator D,unsigned char Check,
 571                                        unsigned char SetMin,
 572                                        unsigned char SetPolicy)
 573 {
 574    unsigned char Dep = 0xFF;
 575
 576    while (D.end() != true)
 577    {
 578       // Compute a single dependency element (glob or)
 579       DepIterator Start = D;
 580       unsigned char State = 0;
 581       for (bool LastOR = true; D.end() == false && LastOR == true; ++D)
 582       {
 583          State |= DepState[D->ID];
 584          LastOR = (D->CompareOp & Dep::Or) == Dep::Or;
 585       }
 586
 587       // Minimum deps that must be satisfied to have a working package
 588       if (Start.IsCritical() == true)
 589          if ((State & Check) != Check)
 590             Dep &= ~SetMin;
 591
 592       // Policy deps that must be satisfied to install the package
 593       if (IsImportantDep(Start) == true &&
 594           (State & Check) != Check)
 595          Dep &= ~SetPolicy;
 596    }
 597
 598    return Dep;
 599 }
 600                                                                         /*}}}*/
 601 // DepCache::DependencyState - Compute the 3 results for a dep          /*{{{*/
 602 // ---------------------------------------------------------------------
 603 /* This is the main dependency computation bit. It computes the 3 main
 604    results for a dependencys, Now, Install and Candidate. Callers must
 605    invert the result if dealing with conflicts. */
 606 unsigned char pkgDepCache::DependencyState(DepIterator &D)
 607 {
 608    unsigned char State = 0;
 609
 610    if (CheckDep(D,NowVersion) == true)
 611       State |= DepNow;
 612    if (CheckDep(D,InstallVersion) == true)
 613       State |= DepInstall;
 614    if (CheckDep(D,CandidateVersion) == true)
 615       State |= DepCVer;
 616
 617    return State;
 618 }
 619                                                                         /*}}}*/
 620 // DepCache::UpdateVerState - Compute the Dep member of the state       /*{{{*/
 621 // ---------------------------------------------------------------------
 622 /* This determines the combined dependency representation of a package
 623    for its two states now and install. This is done by using the pre-generated
 624    dependency information. */
 625 void pkgDepCache::UpdateVerState(PkgIterator Pkg)
 626 {
 627    // Empty deps are always true
 628    StateCache &State = PkgState[Pkg->ID];
 629    State.DepState = 0xFF;
 630
 631    // Check the Current state
 632    if (Pkg->CurrentVer != 0)
 633    {
 634       DepIterator D = Pkg.CurrentVer().DependsList();
 635       State.DepState &= VersionState(D,DepNow,DepNowMin,DepNowPolicy);
 636    }
 637
 638    /* Check the candidate state. We do not compare against the whole as
 639       a candidate state but check the candidate version against the
 640       install states */
 641    if (State.CandidateVer != 0)
 642    {
 643       DepIterator D = State.CandidateVerIter(*this).DependsList();
 644       State.DepState &= VersionState(D,DepInstall,DepCandMin,DepCandPolicy);
 645    }
 646
 647    // Check target state which can only be current or installed
 648    if (State.InstallVer != 0)
 649    {
 650       DepIterator D = State.InstVerIter(*this).DependsList();
 651       State.DepState &= VersionState(D,DepInstall,DepInstMin,DepInstPolicy);
 652    }
 653 }
 654                                                                         /*}}}*/
 655 // DepCache::Update - Figure out all the state information              /*{{{*/
 656 // ---------------------------------------------------------------------
 657 /* This will figure out the state of all the packages and all the
 658    dependencies based on the current policy. */
 659 void pkgDepCache::Update(OpProgress *Prog)
 660 {
 661    iUsrSize = 0;
 662    iDownloadSize = 0;
 663    iDelCount = 0;
 664    iInstCount = 0;
 665    iKeepCount = 0;
 666    iBrokenCount = 0;
 667    iBadCount = 0;
 668
 669    // Perform the depends pass
 670    int Done = 0;
 671    for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
 672    {
 673       if (Prog != 0 && Done%20 == 0)
 674          Prog->Progress(Done);
 675       for (VerIterator V = I.VersionList(); V.end() != true; ++V)
 676       {
 677          unsigned char Group = 0;
 678
 679          for (DepIterator D = V.DependsList(); D.end() != true; ++D)
 680          {
 681             // Build the dependency state.
 682             unsigned char &State = DepState[D->ID];
 683             State = DependencyState(D);
 684
 685             // Add to the group if we are within an or..
 686             Group |= State;
 687             State |= Group << 3;
 688             if ((D->CompareOp & Dep::Or) != Dep::Or)
 689                Group = 0;
 690
 691             // Invert for Conflicts
 692             if (D.IsNegative() == true)
 693                State = ~State;
 694          }
 695       }
 696
 697       // Compute the package dependency state and size additions
 698       AddSizes(I);
 699       UpdateVerState(I);
 700       AddStates(I);
 701    }
 702
 703    if (Prog != 0)
 704       Prog->Progress(Done);
 705
 706    readStateFile(Prog);
 707 }
 708                                                                         /*}}}*/
 709 // DepCache::Update - Update the deps list of a package                 /*{{{*/
 710 // ---------------------------------------------------------------------
 711 /* This is a helper for update that only does the dep portion of the scan.
 712    It is mainly meant to scan reverse dependencies. */
 713 void pkgDepCache::Update(DepIterator D)
 714 {
 715    // Update the reverse deps
 716    for (;D.end() != true; ++D)
 717    {
 718       unsigned char &State = DepState[D->ID];
 719       State = DependencyState(D);
 720
 721       // Invert for Conflicts
 722       if (D.IsNegative() == true)
 723          State = ~State;
 724
 725       RemoveStates(D.ParentPkg());
 726       BuildGroupOrs(D.ParentVer());
 727       UpdateVerState(D.ParentPkg());
 728       AddStates(D.ParentPkg());
 729    }
 730 }
 731                                                                         /*}}}*/
 732 // DepCache::Update - Update the related deps of a package              /*{{{*/
 733 // ---------------------------------------------------------------------
 734 /* This is called whenever the state of a package changes. It updates
 735    all cached dependencies related to this package. */
 736 void pkgDepCache::Update(PkgIterator const &Pkg)
 737 {
 738    // Recompute the dep of the package
 739    RemoveStates(Pkg);
 740    UpdateVerState(Pkg);
 741    AddStates(Pkg);
 742
 743    // Update the reverse deps
 744    Update(Pkg.RevDependsList());
 745
 746    // Update the provides map for the current ver
 747    if (Pkg->CurrentVer != 0)
 748       for (PrvIterator P = Pkg.CurrentVer().ProvidesList();
 749            P.end() != true; ++P)
 750          Update(P.ParentPkg().RevDependsList());
 751
 752    // Update the provides map for the candidate ver
 753    if (PkgState[Pkg->ID].CandidateVer != 0)
 754       for (PrvIterator P = PkgState[Pkg->ID].CandidateVerIter(*this).ProvidesList();
 755            P.end() != true; ++P)
 756          Update(P.ParentPkg().RevDependsList());
 757 }
 758                                                                         /*}}}*/
 759 // DepCache::MarkKeep - Put the package in the keep state               /*{{{*/
 760 // ---------------------------------------------------------------------
 761 /* */
 762 bool pkgDepCache::MarkKeep(PkgIterator const &Pkg, bool Soft, bool FromUser,
 763                            unsigned long Depth)
 764 {
 765    if (IsModeChangeOk(ModeKeep, Pkg, Depth, FromUser) == false)
 766       return false;
 767
 768    /* Reject an attempt to keep a non-source broken installed package, those
 769       must be upgraded */
 770    if (Pkg.State() == PkgIterator::NeedsUnpack &&
 771        Pkg.CurrentVer().Downloadable() == false)
 772       return false;
 773
 774    /* We changed the soft state all the time so the UI is a bit nicer
 775       to use */
 776    StateCache &P = PkgState[Pkg->ID];
 777
 778    // Check that it is not already kept
 779    if (P.Mode == ModeKeep)
 780       return true;
 781
 782    if (Soft == true)
 783       P.iFlags |= AutoKept;
 784    else
 785       P.iFlags &= ~AutoKept;
 786
 787    ActionGroup group(*this);
 788
 789 #if 0 // reseting the autoflag here means we lose the
 790       // auto-mark information if a user selects a package for removal
 791       // but changes  his mind then and sets it for keep again
 792       // - this makes sense as default when all Garbage dependencies
 793       //   are automatically marked for removal (as aptitude does).
 794       //   setting a package for keep then makes it no longer autoinstalled
 795       //   for all other use-case this action is rather suprising
 796    if(FromUser && !P.Marked)
 797      P.Flags &= ~Flag::Auto;
 798 #endif
 799
 800    if (DebugMarker == true)
 801       std::clog << OutputInDepth(Depth) << "MarkKeep " << Pkg << " FU=" << FromUser << std::endl;
 802
 803    RemoveSizes(Pkg);
 804    RemoveStates(Pkg);
 805
 806    P.Mode = ModeKeep;
 807    if (Pkg->CurrentVer == 0)
 808       P.InstallVer = 0;
 809    else
 810       P.InstallVer = Pkg.CurrentVer();
 811
 812    AddStates(Pkg);
 813    Update(Pkg);
 814    AddSizes(Pkg);
 815
 816    return true;
 817 }
 818                                                                         /*}}}*/
 819 // DepCache::MarkDelete - Put the package in the delete state           /*{{{*/
 820 // ---------------------------------------------------------------------
 821 /* */
 822 bool pkgDepCache::MarkDelete(PkgIterator const &Pkg, bool rPurge,
 823                              unsigned long Depth, bool FromUser)
 824 {
 825    if (IsModeChangeOk(ModeDelete, Pkg, Depth, FromUser) == false)
 826       return false;
 827
 828    StateCache &P = PkgState[Pkg->ID];
 829
 830    // Check that it is not already marked for delete
 831    if ((P.Mode == ModeDelete || P.InstallVer == 0) &&
 832        (Pkg.Purge() == true || rPurge == false))
 833       return true;
 834
 835    // check if we are allowed to remove the package
 836    if (IsDeleteOk(Pkg,rPurge,Depth,FromUser) == false)
 837       return false;
 838
 839    P.iFlags &= ~(AutoKept | Purge);
 840    if (rPurge == true)
 841       P.iFlags |= Purge;
 842
 843    ActionGroup group(*this);
 844
 845    if (DebugMarker == true)
 846       std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << Pkg << " FU=" << FromUser << std::endl;
 847
 848    RemoveSizes(Pkg);
 849    RemoveStates(Pkg);
 850
 851    if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
 852       P.Mode = ModeKeep;
 853    else
 854       P.Mode = ModeDelete;
 855    P.InstallVer = 0;
 856
 857    AddStates(Pkg);
 858    Update(Pkg);
 859    AddSizes(Pkg);
 860
 861    return true;
 862 }
 863                                                                         /*}}}*/
 864 // DepCache::IsDeleteOk - check if it is ok to remove this package      /*{{{*/
 865 // ---------------------------------------------------------------------
 866 /* The default implementation tries to prevent deletion of install requests.
 867    dpkg holds are enforced by the private IsModeChangeOk */
 868 bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
 869                               unsigned long Depth, bool FromUser)
 870 {
 871    if (FromUser == false && Pkg->CurrentVer == 0)
 872    {
 873       StateCache &P = PkgState[Pkg->ID];
 874       if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
 875       {
 876          if (DebugMarker == true)
 877             std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << Pkg << std::endl;
 878          return false;
 879       }
 880    }
 881    return true;
 882 }
 883                                                                         /*}}}*/
 884 // DepCache::IsModeChangeOk - check if it is ok to change the mode      /*{{{*/
 885 // ---------------------------------------------------------------------
 886 /* this is used by all Mark methods on the very first line to check sanity
 887    and prevents mode changes for packages on hold for example.
 888    If you want to check Mode specific stuff you can use the virtual public
 889    Is<Mode>Ok methods instead */
 890 char const* PrintMode(char const mode)
 891 {
 892          switch (mode)
 893          {
 894          case pkgDepCache::ModeInstall: return "Install";
 895          case pkgDepCache::ModeKeep: return "Keep";
 896          case pkgDepCache::ModeDelete: return "Delete";
 897          default: return "UNKNOWN";
 898          }
 899 }
 900 bool pkgDepCache::IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg,
 901                                  unsigned long const Depth, bool const FromUser)
 902 {
 903    // we are not trying to hard…
 904    if (unlikely(Depth > 100))
 905       return false;
 906
 907    // general sanity
 908    if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
 909       return false;
 910
 911    // the user is always right
 912    if (FromUser == true)
 913       return true;
 914
 915    StateCache &P = PkgState[Pkg->ID];
 916
 917    // if previous state was set by user only user can reset it
 918    if ((P.iFlags & Protected) == Protected)
 919    {
 920       if (unlikely(DebugMarker == true) && P.Mode != mode)
 921          std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
 922                    << " of " << Pkg << " as its mode (" << PrintMode(P.Mode)
 923                    << ") is protected" << std::endl;
 924       return false;
 925    }
 926    // enforce dpkg holds
 927    else if (mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 928             _config->FindB("APT::Ignore-Hold",false) == false)
 929    {
 930       if (unlikely(DebugMarker == true) && P.Mode != mode)
 931          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 932                    << " of " << Pkg << std::endl;
 933       return false;
 934    }
 935
 936    return true;
 937 }
 938                                                                         /*}}}*/
 939 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 940 // ---------------------------------------------------------------------
 941 /* */
 942 struct CompareProviders {
 943    pkgCache::PkgIterator const Pkg;
 944    CompareProviders(pkgCache::DepIterator const &Dep) : Pkg(Dep.TargetPkg()) {};
 945    //bool operator() (APT::VersionList::iterator const &AV, APT::VersionList::iterator const &BV)
 946    bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
 947    {
 948       pkgCache::PkgIterator const A = AV.ParentPkg();
 949       pkgCache::PkgIterator const B = BV.ParentPkg();
 950       // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
 951       if (A->Group != B->Group)
 952       {
 953          if (A->Group == Pkg->Group && B->Group != Pkg->Group)
 954             return false;
 955          else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
 956             return true;
 957       }
 958       // we like essentials
 959       if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
 960       {
 961          if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 962             return false;
 963          else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 964             return true;
 965       }
 966       if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
 967       {
 968          if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
 969             return false;
 970          else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
 971             return true;
 972       }
 973       // higher priority seems like a good idea
 974       if (AV->Priority != BV->Priority)
 975          return AV->Priority < BV->Priority;
 976       // prefer native architecture
 977       if (strcmp(A.Arch(), B.Arch()) != 0)
 978       {
 979          if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
 980             return false;
 981          else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
 982             return true;
 983          std::vector<std::string> archs = APT::Configuration::getArchitectures();
 984          for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
 985             if (*a == A.Arch())
 986                return false;
 987             else if (*a == B.Arch())
 988                return true;
 989       }
 990       // unable to decide…
 991       return A->ID < B->ID;
 992    }
 993 };
 994 bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 995                               unsigned long Depth, bool FromUser,
 996                               bool ForceImportantDeps)
 997 {
 998    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
 999       return false;
1000
1001    StateCache &P = PkgState[Pkg->ID];
1002
1003    // See if there is even any possible instalation candidate
1004    if (P.CandidateVer == 0)
1005       return false;
1006
1007    /* Check that it is not already marked for install and that it can be
1008       installed */
1009    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
1010        (P.Mode == ModeInstall ||
1011         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1012    {
1013       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1014          return MarkKeep(Pkg, false, FromUser, Depth+1);
1015       return true;
1016    }
1017
1018    // check if we are allowed to install the package
1019    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1020       return false;
1021
1022    ActionGroup group(*this);
1023    P.iFlags &= ~AutoKept;
1024
1025    /* Target the candidate version and remove the autoflag. We reset the
1026       autoflag below if this was called recursively. Otherwise the user
1027       should have the ability to de-auto a package by changing its state */
1028    RemoveSizes(Pkg);
1029    RemoveStates(Pkg);
1030
1031    P.Mode = ModeInstall;
1032    P.InstallVer = P.CandidateVer;
1033
1034    if(FromUser)
1035      {
1036        // Set it to manual if it's a new install or already installed,
1037        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1038        // or if we do automatic installation (aptitude never does it)
1039        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1040          P.Flags &= ~Flag::Auto;
1041      }
1042    else
1043      {
1044        // Set it to auto if this is a new install.
1045        if(P.Status == 2)
1046          P.Flags |= Flag::Auto;
1047      }
1048    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1049       P.Mode = ModeKeep;
1050
1051    AddStates(Pkg);
1052    Update(Pkg);
1053    AddSizes(Pkg);
1054
1055    if (AutoInst == false || _config->Find("APT::Solver", "internal") != "internal")
1056       return true;
1057
1058    if (DebugMarker == true)
1059       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1060
1061    DepIterator Dep = P.InstVerIter(*this).DependsList();
1062    for (; Dep.end() != true;)
1063    {
1064       // Grok or groups
1065       DepIterator Start = Dep;
1066       bool Result = true;
1067       unsigned Ors = 0;
1068       for (bool LastOR = true; Dep.end() == false && LastOR == true; ++Dep, ++Ors)
1069       {
1070          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1071
1072          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1073             Result = false;
1074       }
1075
1076       // Dep is satisfied okay.
1077       if (Result == false)
1078          continue;
1079
1080       /* Check if this dep should be consider for install. If it is a user
1081          defined important dep and we are installed a new package then
1082          it will be installed. Otherwise we only check for important
1083          deps that have changed from the installed version
1084       */
1085       if (IsImportantDep(Start) == false)
1086          continue;
1087
1088       /* If we are in an or group locate the first or that can
1089          succeed. We have already cached this.. */
1090       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; --Ors)
1091          ++Start;
1092       if (Ors == 1 && (DepState[Start->ID] &DepCVer) != DepCVer && Start.IsNegative() == false)
1093       {
1094          if(DebugAutoInstall == true)
1095             std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
1096          if (Start.IsCritical() == false)
1097             continue;
1098          // if the dependency was critical, we can't install it, so remove it again
1099          MarkDelete(Pkg,false,Depth + 1, false);
1100          return false;
1101       }
1102
1103       /* Check if any ImportantDep() (but not Critical) were added
1104        * since we installed the package.  Also check for deps that
1105        * were satisfied in the past: for instance, if a version
1106        * restriction in a Recommends was tightened, upgrading the
1107        * package should follow that Recommends rather than causing the
1108        * dependency to be removed. (bug #470115)
1109        */
1110       if (Pkg->CurrentVer != 0 && ForceImportantDeps == false && Start.IsCritical() == false)
1111       {
1112          bool isNewImportantDep = true;
1113          bool isPreviouslySatisfiedImportantDep = false;
1114          for (DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
1115          {
1116             //FIXME: Should we handle or-group better here?
1117             // We do not check if the package we look for is part of the same or-group
1118             // we might find while searching, but could that really be a problem?
1119             if (D.IsCritical() == true || IsImportantDep(D) == false ||
1120                 Start.TargetPkg() != D.TargetPkg())
1121                continue;
1122
1123             isNewImportantDep = false;
1124
1125             while ((D->CompareOp & Dep::Or) != 0)
1126                ++D;
1127
1128             isPreviouslySatisfiedImportantDep = (((*this)[D] & DepGNow) != 0);
1129             if (isPreviouslySatisfiedImportantDep == true)
1130                break;
1131          }
1132
1133          if(isNewImportantDep == true)
1134          {
1135             if (DebugAutoInstall == true)
1136                std::clog << OutputInDepth(Depth) << "new important dependency: "
1137                          << Start.TargetPkg().FullName() << std::endl;
1138          }
1139          else if(isPreviouslySatisfiedImportantDep == true)
1140          {
1141             if (DebugAutoInstall == true)
1142                std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1143                          << Start.TargetPkg().FullName() << std::endl;
1144          }
1145          else
1146          {
1147             if (DebugAutoInstall == true)
1148                std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
1149                          << Start.TargetPkg().FullName() << std::endl;
1150             continue;
1151          }
1152       }
1153
1154       /* This bit is for processing the possibilty of an install/upgrade
1155          fixing the problem */
1156       if (Start->Type != Dep::DpkgBreaks &&
1157           (DepState[Start->ID] & DepCVer) == DepCVer)
1158       {
1159          APT::VersionList verlist;
1160          pkgCache::VerIterator Cand = PkgState[Start.TargetPkg()->ID].CandidateVerIter(*this);
1161          if (Cand.end() == false && VS().CheckDep(Cand.VerStr(), Start->CompareOp, Start.TargetVer()) == true)
1162             verlist.insert(Cand);
1163          for (PrvIterator Prv = Start.TargetPkg().ProvidesList(); Prv.end() != true; ++Prv)
1164          {
1165             pkgCache::VerIterator V = Prv.OwnerVer();
1166             pkgCache::VerIterator Cand = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1167             if (Cand.end() == true || V != Cand ||
1168                 VS().CheckDep(Cand.VerStr(), Start->CompareOp, Start.TargetVer()) == false)
1169                continue;
1170             verlist.insert(Cand);
1171          }
1172          CompareProviders comp(Start);
1173          APT::VersionList::iterator InstVer = std::max_element(verlist.begin(), verlist.end(), comp);
1174
1175          if (InstVer != verlist.end())
1176          {
1177             pkgCache::PkgIterator InstPkg = InstVer.ParentPkg();
1178             if(DebugAutoInstall == true)
1179                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1180                          << " as " << Start.DepType() << " of " << Pkg.Name()
1181                          << std::endl;
1182             // now check if we should consider it a automatic dependency or not
1183             if(Pkg.Section() && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
1184             {
1185                if(DebugAutoInstall == true)
1186                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1187                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1188                MarkInstall(InstPkg,true,Depth + 1, true);
1189             }
1190             else
1191             {
1192                // mark automatic dependency
1193                MarkInstall(InstPkg,true,Depth + 1, false, ForceImportantDeps);
1194                // Set the autoflag, after MarkInstall because MarkInstall unsets it
1195                if (InstPkg->CurrentVer == 0)
1196                   PkgState[InstPkg->ID].Flags |= Flag::Auto;
1197             }
1198          }
1199          continue;
1200       }
1201
1202       /* For conflicts we just de-install the package and mark as auto,
1203          Conflicts may not have or groups.  For dpkg's Breaks we try to
1204          upgrade the package. */
1205       if (Start.IsNegative() == true)
1206       {
1207          SPtrArray<Version *> List = Start.AllTargets();
1208          for (Version **I = List; *I != 0; I++)
1209          {
1210             VerIterator Ver(*this,*I);
1211             PkgIterator Pkg = Ver.ParentPkg();
1212
1213             /* The List includes all packages providing this dependency,
1214                even providers which are not installed, so skip them. */
1215             if (PkgState[Pkg->ID].InstallVer == 0)
1216                continue;
1217
1218             if (PkgState[Pkg->ID].CandidateVer != *I &&
1219                 Start->Type == Dep::DpkgBreaks &&
1220                 MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps) == true)
1221                continue;
1222             else if (MarkDelete(Pkg,false,Depth + 1, false) == false)
1223                break;
1224          }
1225          continue;
1226       }
1227    }
1228
1229    return Dep.end() == true;
1230 }
1231                                                                         /*}}}*/
1232 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1233 // ---------------------------------------------------------------------
1234 /* The default implementation does nothing.
1235    dpkg holds are enforced by the private IsModeChangeOk */
1236 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1237                               unsigned long Depth, bool FromUser)
1238 {
1239    return true;
1240 }
1241                                                                         /*}}}*/
1242 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1243 // ---------------------------------------------------------------------
1244 /* */
1245 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1246 {
1247    if (unlikely(Pkg.end() == true))
1248       return;
1249
1250    APT::PackageList pkglist;
1251    if (Pkg->CurrentVer != 0 &&
1252        (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
1253    {
1254       pkgCache::GrpIterator Grp = Pkg.Group();
1255       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
1256       {
1257          if (P->CurrentVer != 0)
1258             pkglist.insert(P);
1259       }
1260    }
1261    else
1262       pkglist.insert(Pkg);
1263
1264    ActionGroup group(*this);
1265
1266    for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
1267    {
1268       RemoveSizes(Pkg);
1269       RemoveStates(Pkg);
1270
1271       StateCache &P = PkgState[Pkg->ID];
1272       if (To == true)
1273          P.iFlags |= ReInstall;
1274       else
1275          P.iFlags &= ~ReInstall;
1276
1277       AddStates(Pkg);
1278       AddSizes(Pkg);
1279    }
1280 }
1281                                                                         /*}}}*/
1282 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1283 // ---------------------------------------------------------------------
1284 /* */
1285 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
1286 {
1287    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1288    StateCache &P = PkgState[Pkg->ID];
1289
1290    if (P.CandidateVer == TargetVer)
1291       return;
1292
1293    ActionGroup group(*this);
1294
1295    RemoveSizes(Pkg);
1296    RemoveStates(Pkg);
1297
1298    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1299       P.InstallVer = (Version *)TargetVer;
1300    P.CandidateVer = (Version *)TargetVer;
1301    P.Update(Pkg,*this);
1302
1303    AddStates(Pkg);
1304    Update(Pkg);
1305    AddSizes(Pkg);
1306
1307 }
1308                                                                         /*}}}*/
1309 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1310 // ---------------------------------------------------------------------
1311 /* changes the candidate of a package and walks over all its dependencies
1312    to check if it needs to change the candidate of the dependency, too,
1313    to reach a installable versionstate */
1314 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1315                                         std::string const &TargetRel)
1316 {
1317    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1318    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1319 }
1320 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1321                                         std::string const &TargetRel,
1322                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1323 {
1324    ActionGroup group(*this);
1325    SetCandidateVersion(TargetVer);
1326
1327    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1328       return true;
1329
1330    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1331    // save the position of the last element we will not undo - if we have to
1332    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1333
1334    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1335    {
1336       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1337           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1338            IsImportantDep(D) == false))
1339          continue;
1340
1341       // walk over an or-group and check if we need to do anything
1342       // for simpilicity no or-group is handled as a or-group including one dependency
1343       pkgCache::DepIterator Start = D;
1344       bool itsFine = false;
1345       for (bool stillOr = true; stillOr == true; ++Start)
1346       {
1347          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1348          pkgCache::PkgIterator const P = Start.TargetPkg();
1349          // virtual packages can't be a solution
1350          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1351             continue;
1352          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1353          // no versioned dependency - but is it installable?
1354          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1355          {
1356             // Check if one of the providers is installable
1357             if (P->ProvidesList != 0)
1358             {
1359                pkgCache::PrvIterator Prv = P.ProvidesList();
1360                for (; Prv.end() == false; ++Prv)
1361                {
1362                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1363                   if (C.end() == true || C != Prv.OwnerVer() ||
1364                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1365                      continue;
1366                   break;
1367                }
1368                if (Prv.end() == true)
1369                   continue;
1370             }
1371             // no providers, so check if we have an installable candidate version
1372             else if (Cand.end() == true ||
1373                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1374                continue;
1375             itsFine = true;
1376             break;
1377          }
1378          if (Cand.end() == true)
1379             continue;
1380          // check if the current candidate is enough for the versioned dependency - and installable?
1381          if (VS().CheckDep(P.CandVersion(), Start->CompareOp, Start.TargetVer()) == true &&
1382              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1383          {
1384             itsFine = true;
1385             break;
1386          }
1387       }
1388
1389       if (itsFine == true) {
1390          // something in the or-group was fine, skip all other members
1391          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1392          continue;
1393       }
1394
1395       // walk again over the or-group and check each if a candidate switch would help
1396       itsFine = false;
1397       for (bool stillOr = true; stillOr == true; ++D)
1398       {
1399          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1400          // changing candidate will not help if the dependency is not versioned
1401          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1402          {
1403             if (stillOr == true)
1404                continue;
1405             break;
1406          }
1407
1408          pkgCache::VerIterator V;
1409          if (TargetRel == "newest")
1410             V = D.TargetPkg().VersionList();
1411          else
1412             V = Match.Find(D.TargetPkg());
1413
1414          // check if the version from this release could satisfy the dependency
1415          if (V.end() == true || VS().CheckDep(V.VerStr(), D->CompareOp, D.TargetVer()) == false)
1416          {
1417             if (stillOr == true)
1418                continue;
1419             break;
1420          }
1421
1422          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1423          if (V == oldCand)
1424          {
1425             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1426             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1427                  c != Changed.end(); ++c)
1428             {
1429                if (c->first->ParentPkg != V->ParentPkg)
1430                   continue;
1431                itsFine = true;
1432                break;
1433             }
1434          }
1435
1436          if (itsFine == false)
1437          {
1438             // change the candidate
1439             Changed.push_back(make_pair(oldCand, TargetVer));
1440             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1441             {
1442                if (stillOr == false)
1443                   break;
1444                // undo the candidate changing
1445                SetCandidateVersion(oldCand);
1446                Changed.pop_back();
1447                continue;
1448             }
1449             itsFine = true;
1450          }
1451
1452          // something in the or-group was fine, skip all other members
1453          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1454          break;
1455       }
1456
1457       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1458       {
1459          // undo all changes which aren't lead to a solution
1460          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1461               c != Changed.end(); ++c)
1462             SetCandidateVersion(c->first);
1463          Changed.erase(newChanged, Changed.end());
1464          return false;
1465       }
1466    }
1467    return true;
1468 }
1469                                                                         /*}}}*/
1470 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1471 // ---------------------------------------------------------------------
1472 /* */
1473 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1474 {
1475   StateCache &state = PkgState[Pkg->ID];
1476
1477   ActionGroup group(*this);
1478
1479   if(Auto)
1480     state.Flags |= Flag::Auto;
1481   else
1482     state.Flags &= ~Flag::Auto;
1483 }
1484                                                                         /*}}}*/
1485 // StateCache::Update - Compute the various static display things       /*{{{*/
1486 // ---------------------------------------------------------------------
1487 /* This is called whenever the Candidate version changes. */
1488 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1489 {
1490    // Some info
1491    VerIterator Ver = CandidateVerIter(Cache);
1492
1493    // Use a null string or the version string
1494    if (Ver.end() == true)
1495       CandVersion = "";
1496    else
1497       CandVersion = Ver.VerStr();
1498
1499    // Find the current version
1500    CurVersion = "";
1501    if (Pkg->CurrentVer != 0)
1502       CurVersion = Pkg.CurrentVer().VerStr();
1503
1504    // Strip off the epochs for display
1505    CurVersion = StripEpoch(CurVersion);
1506    CandVersion = StripEpoch(CandVersion);
1507
1508    // Figure out if its up or down or equal
1509    Status = Ver.CompareVer(Pkg.CurrentVer());
1510    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1511      Status = 2;
1512 }
1513                                                                         /*}}}*/
1514 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1515 // ---------------------------------------------------------------------
1516 /* */
1517 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1518 {
1519    if (Ver == 0)
1520       return 0;
1521
1522    // Strip any epoch
1523    for (const char *I = Ver; *I != 0; I++)
1524       if (*I == ':')
1525          return I + 1;
1526    return Ver;
1527 }
1528                                                                         /*}}}*/
1529 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1530 // ---------------------------------------------------------------------
1531 /* The default just returns the highest available version that is not
1532    a source and automatic. */
1533 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1534 {
1535    /* Not source/not automatic versions cannot be a candidate version
1536       unless they are already installed */
1537    VerIterator Last(*(pkgCache *)this,0);
1538
1539    for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
1540    {
1541       if (Pkg.CurrentVer() == I)
1542          return I;
1543
1544       for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
1545       {
1546          if ((J.File()->Flags & Flag::NotSource) != 0)
1547             continue;
1548
1549          /* Stash the highest version of a not-automatic source, we use it
1550             if there is nothing better */
1551          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1552              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1553          {
1554             if (Last.end() == true)
1555                Last = I;
1556             continue;
1557          }
1558
1559          return I;
1560       }
1561    }
1562
1563    return Last;
1564 }
1565                                                                         /*}}}*/
1566 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1567 // ---------------------------------------------------------------------
1568 /* */
1569 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1570 {
1571    if(Dep.IsCritical())
1572       return true;
1573    else if(Dep->Type == pkgCache::Dep::Recommends)
1574    {
1575       if (InstallRecommends)
1576          return true;
1577       // we suport a special mode to only install-recommends for certain
1578       // sections
1579       // FIXME: this is a meant as a temporarly solution until the
1580       //        recommends are cleaned up
1581       const char *sec = Dep.ParentVer().Section();
1582       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1583          return true;
1584    }
1585    else if(Dep->Type == pkgCache::Dep::Suggests)
1586       return InstallSuggests;
1587
1588    return false;
1589 }
1590                                                                         /*}}}*/
1591 // Policy::GetPriority - Get the priority of the package pin            /*{{{*/
1592 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &Pkg)
1593 { return 0; };
1594 signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &File)
1595 { return 0; };
1596                                                                         /*}}}*/
1597 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1598 {
1599   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1600   if(f->wasConstructedSuccessfully())
1601     return f;
1602   else
1603     {
1604       delete f;
1605       return NULL;
1606     }
1607 }
1608                                                                         /*}}}*/
1609 bool pkgDepCache::MarkFollowsRecommends()
1610 {
1611   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1612 }
1613
1614 bool pkgDepCache::MarkFollowsSuggests()
1615 {
1616   return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
1617 }
1618
1619 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1620 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1621 {
1622    if (_config->Find("APT::Solver", "internal") != "internal")
1623       return true;
1624
1625    bool follow_recommends;
1626    bool follow_suggests;
1627    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1628
1629    // init the states
1630    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1631    {
1632       PkgState[p->ID].Marked  = false;
1633       PkgState[p->ID].Garbage = false;
1634
1635       // debug output
1636       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1637          std::clog << "AutoDep: " << p.FullName() << std::endl;
1638    }
1639
1640    // init vars
1641    follow_recommends = MarkFollowsRecommends();
1642    follow_suggests   = MarkFollowsSuggests();
1643
1644
1645
1646    // do the mark part, this is the core bit of the algorithm
1647    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1648    {
1649       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1650           (p->Flags & Flag::Essential) ||
1651           (p->Flags & Flag::Important) ||
1652           userFunc.InRootSet(p) ||
1653           // be nice even then a required package violates the policy (#583517)
1654           // and do the full mark process also for required packages
1655           (p.CurrentVer().end() != true &&
1656            p.CurrentVer()->Priority == pkgCache::State::Required))
1657       {
1658          // the package is installed (and set to keep)
1659          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1660             MarkPackage(p, p.CurrentVer(),
1661                         follow_recommends, follow_suggests);
1662          // the package is to be installed
1663          else if(PkgState[p->ID].Install())
1664             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1665                         follow_recommends, follow_suggests);
1666       }
1667    }
1668
1669    return true;
1670 }
1671                                                                         /*}}}*/
1672 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1673 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1674                               const pkgCache::VerIterator &ver,
1675                               bool const &follow_recommends,
1676                               bool const &follow_suggests)
1677 {
1678    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1679
1680    // if we are marked already we are done
1681    if(state.Marked)
1682       return;
1683
1684    VerIterator const currver = pkg.CurrentVer();
1685    VerIterator const instver = state.InstVerIter(*this);
1686
1687 #if 0
1688    VerIterator const candver = state.CandidateVerIter(*this);
1689
1690    // If a package was garbage-collected but is now being marked, we
1691    // should re-select it
1692    // For cases when a pkg is set to upgrade and this trigger the
1693    // removal of a no-longer used dependency.  if the pkg is set to
1694    // keep again later it will result in broken deps
1695    if(state.Delete() && state.RemoveReason = Unused)
1696    {
1697       if(ver==candver)
1698          mark_install(pkg, false, false, NULL);
1699       else if(ver==pkg.CurrentVer())
1700          MarkKeep(pkg, false, false);
1701
1702       instver=state.InstVerIter(*this);
1703    }
1704 #endif
1705
1706    // For packages that are not going to be removed, ignore versions
1707    // other than the InstVer.  For packages that are going to be
1708    // removed, ignore versions other than the current version.
1709    if(!(ver == instver && !instver.end()) &&
1710       !(ver == currver && instver.end() && !ver.end()))
1711       return;
1712
1713    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1714
1715    if(debug_autoremove)
1716      {
1717        std::clog << "Marking: " << pkg.FullName();
1718        if(!ver.end())
1719          std::clog << " " << ver.VerStr();
1720        if(!currver.end())
1721          std::clog << ", Curr=" << currver.VerStr();
1722        if(!instver.end())
1723          std::clog << ", Inst=" << instver.VerStr();
1724        std::clog << std::endl;
1725      }
1726
1727    state.Marked=true;
1728
1729    if(ver.end() == true)
1730       return;
1731
1732      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1733      {
1734         if(d->Type == Dep::Depends ||
1735            d->Type == Dep::PreDepends ||
1736            (follow_recommends &&
1737             d->Type == Dep::Recommends) ||
1738            (follow_suggests &&
1739             d->Type == Dep::Suggests))
1740         {
1741            // Try all versions of this package.
1742            for(VerIterator V = d.TargetPkg().VersionList();
1743                !V.end(); ++V)
1744            {
1745               if(_system->VS->CheckDep(V.VerStr(), d->CompareOp, d.TargetVer()))
1746               {
1747                 if(debug_autoremove)
1748                   {
1749                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1750                               << " " << d.ParentVer().VerStr() << " "
1751                               << d.DepType() << " " << d.TargetPkg().FullName();
1752                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1753                       {
1754                         std::clog << " (" << d.CompType() << " "
1755                                   << d.TargetVer() << ")";
1756                       }
1757                     std::clog << std::endl;
1758                   }
1759                  MarkPackage(V.ParentPkg(), V,
1760                              follow_recommends, follow_suggests);
1761               }
1762            }
1763            // Now try virtual packages
1764            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1765                !prv.end(); ++prv)
1766            {
1767               if(_system->VS->CheckDep(prv.ProvideVersion(), d->CompareOp,
1768                                        d.TargetVer()))
1769               {
1770                 if(debug_autoremove)
1771                   {
1772                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1773                               << d.ParentVer().VerStr() << " "
1774                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1775                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1776                       {
1777                         std::clog << " (" << d.CompType() << " "
1778                                   << d.TargetVer() << ")";
1779                       }
1780                     std::clog << ", provided by "
1781                               << prv.OwnerPkg().FullName() << " "
1782                               << prv.OwnerVer().VerStr()
1783                               << std::endl;
1784                   }
1785
1786                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1787                              follow_recommends, follow_suggests);
1788               }
1789            }
1790         }
1791      }
1792 }
1793                                                                         /*}}}*/
1794 bool pkgDepCache::Sweep()                                               /*{{{*/
1795 {
1796    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1797
1798    // do the sweep
1799    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1800    {
1801      StateCache &state=PkgState[p->ID];
1802
1803      // skip required packages
1804      if (!p.CurrentVer().end() &&
1805          (p.CurrentVer()->Priority == pkgCache::State::Required))
1806         continue;
1807
1808      // if it is not marked and it is installed, it's garbage
1809      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1810      {
1811         state.Garbage=true;
1812         if(debug_autoremove)
1813            std::clog << "Garbage: " << p.FullName() << std::endl;
1814      }
1815   }
1816
1817    return true;
1818 }
1819                                                                         /*}}}*/