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