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 <apt-pkg/depcache.h>
  12 #include <apt-pkg/version.h>
  13 #include <apt-pkg/versionmatch.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/sptr.h>
  16 #include <apt-pkg/algorithms.h>
  17
  18 #include <apt-pkg/fileutl.h>
  19 #include <apt-pkg/strutl.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/aptconfiguration.h>
  22 #include <apt-pkg/pkgsystem.h>
  23 #include <apt-pkg/tagfile.h>
  24
  25 #include <iostream>
  26 #include <sstream>
  27 #include <set>
  28
  29 #include <sys/stat.h>
  30
  31 #include <apti18n.h>
  32                                                                         /*}}}*/
  33 // helper for Install-Recommends-Sections and Never-MarkAuto-Sections   /*{{{*/
  34 static bool
  35 ConfigValueInSubTree(const char* SubTree, const char *needle)
  36 {
  37    Configuration::Item const *Opts;
  38    Opts = _config->Tree(SubTree);
  39    if (Opts != 0 && Opts->Child != 0)
  40    {
  41       Opts = Opts->Child;
  42       for (; Opts != 0; Opts = Opts->Next)
  43       {
  44          if (Opts->Value.empty() == true)
  45             continue;
  46          if (strcmp(needle, Opts->Value.c_str()) == 0)
  47             return true;
  48       }
  49    }
  50    return false;
  51 }
  52                                                                         /*}}}*/
  53 pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :             /*{{{*/
  54   cache(cache), released(false)
  55 {
  56   ++cache.group_level;
  57 }
  58
  59 void pkgDepCache::ActionGroup::release()
  60 {
  61   if(!released)
  62     {
  63       if(cache.group_level == 0)
  64         std::cerr << "W: Unbalanced action groups, expect badness" << std::endl;
  65       else
  66         {
  67           --cache.group_level;
  68
  69           if(cache.group_level == 0)
  70             cache.MarkAndSweep();
  71         }
  72
  73       released = false;
  74     }
  75 }
  76
  77 pkgDepCache::ActionGroup::~ActionGroup()
  78 {
  79   release();
  80 }
  81                                                                         /*}}}*/
  82 // DepCache::pkgDepCache - Constructors                                 /*{{{*/
  83 // ---------------------------------------------------------------------
  84 /* */
  85 pkgDepCache::pkgDepCache(pkgCache *pCache,Policy *Plcy) :
  86   group_level(0), Cache(pCache), PkgState(0), DepState(0)
  87 {
  88    DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
  89    DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
  90    delLocalPolicy = 0;
  91    LocalPolicy = Plcy;
  92    if (LocalPolicy == 0)
  93       delLocalPolicy = LocalPolicy = new Policy;
  94 }
  95                                                                         /*}}}*/
  96 // DepCache::~pkgDepCache - Destructor                                  /*{{{*/
  97 // ---------------------------------------------------------------------
  98 /* */
  99 pkgDepCache::~pkgDepCache()
 100 {
 101    delete [] PkgState;
 102    delete [] DepState;
 103    delete delLocalPolicy;
 104 }
 105                                                                         /*}}}*/
 106 // DepCache::Init - Generate the initial extra structures.              /*{{{*/
 107 // ---------------------------------------------------------------------
 108 /* This allocats the extension buffers and initializes them. */
 109 bool pkgDepCache::Init(OpProgress *Prog)
 110 {
 111    // Suppress mark updates during this operation (just in case) and
 112    // run a mark operation when Init terminates.
 113    ActionGroup actions(*this);
 114
 115    delete [] PkgState;
 116    delete [] DepState;
 117    PkgState = new StateCache[Head().PackageCount];
 118    DepState = new unsigned char[Head().DependsCount];
 119    memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
 120    memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
 121
 122    if (Prog != 0)
 123    {
 124       Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
 125                             _("Building dependency tree"));
 126       Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
 127    }
 128
 129    /* Set the current state of everything. In this state all of the
 130       packages are kept exactly as is. See AllUpgrade */
 131    int Done = 0;
 132    for (PkgIterator I = PkgBegin(); I.end() != true; I++,Done++)
 133    {
 134       if (Prog != 0 && Done%20 == 0)
 135          Prog->Progress(Done);
 136
 137       // Find the proper cache slot
 138       StateCache &State = PkgState[I->ID];
 139       State.iFlags = 0;
 140
 141       // Figure out the install version
 142       State.CandidateVer = GetCandidateVer(I);
 143       State.InstallVer = I.CurrentVer();
 144       State.Mode = ModeKeep;
 145
 146       State.Update(I,*this);
 147    }
 148
 149    if (Prog != 0)
 150    {
 151
 152       Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
 153                             Head().PackageCount,
 154                             _("Building dependency tree"));
 155       Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
 156    }
 157
 158    Update(Prog);
 159
 160    if(Prog != 0)
 161       Prog->Done();
 162
 163    return true;
 164 }
 165                                                                         /*}}}*/
 166 bool pkgDepCache::readStateFile(OpProgress *Prog)                       /*{{{*/
 167 {
 168    FileFd state_file;
 169    string const state = _config->FindFile("Dir::State::extended_states");
 170    if(RealFileExists(state)) {
 171       state_file.Open(state, FileFd::ReadOnly);
 172       int const file_size = state_file.Size();
 173       if(Prog != NULL)
 174          Prog->OverallProgress(0, file_size, 1,
 175                                _("Reading state information"));
 176
 177       pkgTagFile tagfile(&state_file);
 178       pkgTagSection section;
 179       int amt = 0;
 180       bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 181       while(tagfile.Step(section)) {
 182          string const pkgname = section.FindS("Package");
 183          string pkgarch = section.FindS("Architecture");
 184          if (pkgarch.empty() == true)
 185             pkgarch = "any";
 186          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 187          // Silently ignore unknown packages and packages with no actual version.
 188          if(pkg.end() == true || pkg->VersionList == 0)
 189             continue;
 190
 191          short const reason = section.FindI("Auto-Installed", 0);
 192          if(reason > 0)
 193          {
 194             PkgState[pkg->ID].Flags |= Flag::Auto;
 195             if (unlikely(debug_autoremove))
 196                std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
 197             if (pkgarch == "any")
 198             {
 199                pkgCache::GrpIterator G = pkg.Group();
 200                for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
 201                   if (pkg->VersionList != 0)
 202                      PkgState[pkg->ID].Flags |= Flag::Auto;
 203             }
 204          }
 205          amt += section.size();
 206          if(Prog != NULL)
 207             Prog->OverallProgress(amt, file_size, 1,
 208                                   _("Reading state information"));
 209       }
 210       if(Prog != NULL)
 211          Prog->OverallProgress(file_size, file_size, 1,
 212                                _("Reading state information"));
 213    }
 214
 215    return true;
 216 }
 217                                                                         /*}}}*/
 218 bool pkgDepCache::writeStateFile(OpProgress *prog, bool InstalledOnly)  /*{{{*/
 219 {
 220    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
 221
 222    if(debug_autoremove)
 223       std::clog << "pkgDepCache::writeStateFile()" << std::endl;
 224
 225    FileFd StateFile;
 226    string const state = _config->FindFile("Dir::State::extended_states");
 227
 228    // if it does not exist, create a empty one
 229    if(!RealFileExists(state))
 230    {
 231       StateFile.Open(state, FileFd::WriteAtomic);
 232       StateFile.Close();
 233    }
 234
 235    // open it
 236    if(!StateFile.Open(state, FileFd::ReadOnly))
 237       return _error->Error(_("Failed to open StateFile %s"),
 238                            state.c_str());
 239
 240    FILE *OutFile;
 241    string const outfile = state + ".tmp";
 242    if((OutFile = fopen(outfile.c_str(),"w")) == NULL)
 243       return _error->Error(_("Failed to write temporary StateFile %s"),
 244                            outfile.c_str());
 245
 246    // first merge with the existing sections
 247    pkgTagFile tagfile(&StateFile);
 248    pkgTagSection section;
 249    std::set<string> pkgs_seen;
 250    const char *nullreorderlist[] = {0};
 251    while(tagfile.Step(section)) {
 252          string const pkgname = section.FindS("Package");
 253          string pkgarch = section.FindS("Architecture");
 254          if (pkgarch.empty() == true)
 255             pkgarch = "native";
 256          // Silently ignore unknown packages and packages with no actual
 257          // version.
 258          pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
 259          if(pkg.end() || pkg.VersionList().end())
 260             continue;
 261          StateCache const &P = PkgState[pkg->ID];
 262          bool newAuto = (P.Flags & Flag::Auto);
 263          // skip not installed or now-removed ones if requested
 264          if (InstalledOnly && (
 265              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 266              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 267          {
 268             // The section is obsolete if it contains no other tag
 269             unsigned int const count = section.Count();
 270             if (count < 2 ||
 271                 (count == 2 && section.Exists("Auto-Installed")) ||
 272                 (count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
 273                continue;
 274             else
 275                newAuto = false;
 276          }
 277          if(_config->FindB("Debug::pkgAutoRemove",false))
 278             std::clog << "Update existing AutoInstall info: "
 279                       << pkg.FullName() << std::endl;
 280          TFRewriteData rewrite[3];
 281          rewrite[0].Tag = "Architecture";
 282          rewrite[0].Rewrite = pkg.Arch();
 283          rewrite[0].NewTag = 0;
 284          rewrite[1].Tag = "Auto-Installed";
 285          rewrite[1].Rewrite = newAuto ? "1" : "0";
 286          rewrite[1].NewTag = 0;
 287          rewrite[2].Tag = 0;
 288          TFRewrite(OutFile, section, nullreorderlist, rewrite);
 289          fprintf(OutFile,"\n");
 290          pkgs_seen.insert(pkg.FullName());
 291    }
 292
 293    // then write the ones we have not seen yet
 294    std::ostringstream ostr;
 295    for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); pkg++) {
 296       StateCache const &P = PkgState[pkg->ID];
 297       if(P.Flags & Flag::Auto) {
 298          if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
 299             if(debug_autoremove)
 300                std::clog << "Skipping already written " << pkg.FullName() << std::endl;
 301             continue;
 302          }
 303          // skip not installed ones if requested
 304          if (InstalledOnly && (
 305              (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
 306              (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
 307             continue;
 308          const char* const pkgarch = pkg.Arch();
 309          if (strcmp(pkgarch, "all") == 0)
 310             continue;
 311          if(debug_autoremove)
 312             std::clog << "Writing new AutoInstall: " << pkg.FullName() << std::endl;
 313          ostr.str(string(""));
 314          ostr << "Package: " << pkg.Name()
 315               << "\nArchitecture: " << pkgarch
 316               << "\nAuto-Installed: 1\n\n";
 317          fprintf(OutFile,"%s",ostr.str().c_str());
 318       }
 319    }
 320    fclose(OutFile);
 321
 322    // move the outfile over the real file and set permissions
 323    rename(outfile.c_str(), state.c_str());
 324    chmod(state.c_str(), 0644);
 325
 326    return true;
 327 }
 328                                                                         /*}}}*/
 329 // DepCache::CheckDep - Checks a single dependency                      /*{{{*/
 330 // ---------------------------------------------------------------------
 331 /* This first checks the dependency against the main target package and
 332    then walks along the package provides list and checks if each provides
 333    will be installed then checks the provides against the dep. Res will be
 334    set to the package which was used to satisfy the dep. */
 335 bool pkgDepCache::CheckDep(DepIterator Dep,int Type,PkgIterator &Res)
 336 {
 337    Res = Dep.TargetPkg();
 338
 339    /* Check simple depends. A depends -should- never self match but
 340       we allow it anyhow because dpkg does. Technically it is a packaging
 341       bug. Conflicts may never self match */
 342    if (Dep.TargetPkg() != Dep.ParentPkg() ||
 343        (Dep->Type != Dep::Conflicts && Dep->Type != Dep::DpkgBreaks && Dep->Type != Dep::Obsoletes))
 344    {
 345       PkgIterator Pkg = Dep.TargetPkg();
 346       // Check the base package
 347       if (Type == NowVersion && Pkg->CurrentVer != 0)
 348          if (VS().CheckDep(Pkg.CurrentVer().VerStr(),Dep->CompareOp,
 349                                  Dep.TargetVer()) == true)
 350             return true;
 351
 352       if (Type == InstallVersion && PkgState[Pkg->ID].InstallVer != 0)
 353          if (VS().CheckDep(PkgState[Pkg->ID].InstVerIter(*this).VerStr(),
 354                                  Dep->CompareOp,Dep.TargetVer()) == true)
 355             return true;
 356
 357       if (Type == CandidateVersion && PkgState[Pkg->ID].CandidateVer != 0)
 358          if (VS().CheckDep(PkgState[Pkg->ID].CandidateVerIter(*this).VerStr(),
 359                                  Dep->CompareOp,Dep.TargetVer()) == true)
 360             return true;
 361    }
 362
 363    if (Dep->Type == Dep::Obsoletes)
 364       return false;
 365
 366    // Check the providing packages
 367    PrvIterator P = Dep.TargetPkg().ProvidesList();
 368    PkgIterator Pkg = Dep.ParentPkg();
 369    for (; P.end() != true; P++)
 370    {
 371       /* Provides may never be applied against the same package (or group)
 372          if it is a conflicts. See the comment above. */
 373       if (P.OwnerPkg()->Group == Pkg->Group &&
 374           (Dep->Type == Dep::Conflicts || Dep->Type == Dep::DpkgBreaks))
 375          continue;
 376
 377       // Check if the provides is a hit
 378       if (Type == NowVersion)
 379       {
 380          if (P.OwnerPkg().CurrentVer() != P.OwnerVer())
 381             continue;
 382       }
 383
 384       if (Type == InstallVersion)
 385       {
 386          StateCache &State = PkgState[P.OwnerPkg()->ID];
 387          if (State.InstallVer != (Version *)P.OwnerVer())
 388             continue;
 389       }
 390
 391       if (Type == CandidateVersion)
 392       {
 393          StateCache &State = PkgState[P.OwnerPkg()->ID];
 394          if (State.CandidateVer != (Version *)P.OwnerVer())
 395             continue;
 396       }
 397
 398       // Compare the versions.
 399       if (VS().CheckDep(P.ProvideVersion(),Dep->CompareOp,Dep.TargetVer()) == true)
 400       {
 401          Res = P.OwnerPkg();
 402          return true;
 403       }
 404    }
 405
 406    return false;
 407 }
 408                                                                         /*}}}*/
 409 // DepCache::AddSizes - Add the packages sizes to the counters          /*{{{*/
 410 // ---------------------------------------------------------------------
 411 /* Call with Mult = -1 to preform the inverse opration
 412    The Mult increases the complexity of the calulations here and is unused -
 413    or do we really have a usecase for removing the size of a package two
 414    times? So let us replace it with a simple bool and be done with it… */
 415 __deprecated void pkgDepCache::AddSizes(const PkgIterator &Pkg,signed long Mult)
 416 {
 417    StateCache &P = PkgState[Pkg->ID];
 418
 419    if (Pkg->VersionList == 0)
 420       return;
 421
 422    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 423        P.Keep() == true)
 424       return;
 425
 426    // Compute the size data
 427    if (P.NewInstall() == true)
 428    {
 429       iUsrSize += (signed long long)(Mult*P.InstVerIter(*this)->InstalledSize);
 430       iDownloadSize += (signed long long)(Mult*P.InstVerIter(*this)->Size);
 431       return;
 432    }
 433
 434    // Upgrading
 435    if (Pkg->CurrentVer != 0 &&
 436        (P.InstallVer != (Version *)Pkg.CurrentVer() ||
 437         (P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
 438    {
 439       iUsrSize += (signed long long)(Mult*((signed long long)P.InstVerIter(*this)->InstalledSize -
 440                         (signed long long)Pkg.CurrentVer()->InstalledSize));
 441       iDownloadSize += (signed long long)(Mult*P.InstVerIter(*this)->Size);
 442       return;
 443    }
 444
 445    // Reinstall
 446    if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
 447        P.Delete() == false)
 448    {
 449       iDownloadSize += (signed long long)(Mult*P.InstVerIter(*this)->Size);
 450       return;
 451    }
 452
 453    // Removing
 454    if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
 455    {
 456       iUsrSize -= (signed long long)(Mult*Pkg.CurrentVer()->InstalledSize);
 457       return;
 458    }
 459 }
 460                                                                         /*}}}*/
 461 // DepCache::AddSizes - Add the packages sizes to the counters          /*{{{*/
 462 // ---------------------------------------------------------------------
 463 /* Call with Inverse = true to preform the inverse opration */
 464 void pkgDepCache::AddSizes(const PkgIterator &Pkg, bool const &Inverse)
 465 {
 466    StateCache &P = PkgState[Pkg->ID];
 467
 468    if (Pkg->VersionList == 0)
 469       return;
 470
 471    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 472        P.Keep() == true)
 473       return;
 474
 475    // Compute the size data
 476    if (P.NewInstall() == true)
 477    {
 478       if (Inverse == false) {
 479          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 480          iDownloadSize += P.InstVerIter(*this)->Size;
 481       } else {
 482          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 483          iDownloadSize -= P.InstVerIter(*this)->Size;
 484       }
 485       return;
 486    }
 487
 488    // Upgrading
 489    if (Pkg->CurrentVer != 0 &&
 490        (P.InstallVer != (Version *)Pkg.CurrentVer() ||
 491         (P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
 492    {
 493       if (Inverse == false) {
 494          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 495          iUsrSize += P.InstVerIter(*this)->InstalledSize;
 496          iDownloadSize += P.InstVerIter(*this)->Size;
 497       } else {
 498          iUsrSize -= P.InstVerIter(*this)->InstalledSize;
 499          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 500          iDownloadSize -= P.InstVerIter(*this)->Size;
 501       }
 502       return;
 503    }
 504
 505    // Reinstall
 506    if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
 507        P.Delete() == false)
 508    {
 509       if (Inverse == false)
 510          iDownloadSize += P.InstVerIter(*this)->Size;
 511       else
 512          iDownloadSize -= P.InstVerIter(*this)->Size;
 513       return;
 514    }
 515
 516    // Removing
 517    if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
 518    {
 519       if (Inverse == false)
 520          iUsrSize -= Pkg.CurrentVer()->InstalledSize;
 521       else
 522          iUsrSize += Pkg.CurrentVer()->InstalledSize;
 523       return;
 524    }
 525 }
 526                                                                         /*}}}*/
 527 // DepCache::AddStates - Add the package to the state counter           /*{{{*/
 528 // ---------------------------------------------------------------------
 529 /* This routine is tricky to use, you must make sure that it is never
 530    called twice for the same package. This means the Remove/Add section
 531    should be as short as possible and not encompass any code that will
 532    calld Remove/Add itself. Remember, dependencies can be circular so
 533    while processing a dep for Pkg it is possible that Add/Remove
 534    will be called on Pkg */
 535 void pkgDepCache::AddStates(const PkgIterator &Pkg,int Add)
 536 {
 537    StateCache &State = PkgState[Pkg->ID];
 538
 539    // The Package is broken (either minimal dep or policy dep)
 540    if ((State.DepState & DepInstMin) != DepInstMin)
 541       iBrokenCount += Add;
 542    if ((State.DepState & DepInstPolicy) != DepInstPolicy)
 543       iPolicyBrokenCount += Add;
 544
 545    // Bad state
 546    if (Pkg.State() != PkgIterator::NeedsNothing)
 547       iBadCount += Add;
 548
 549    // Not installed
 550    if (Pkg->CurrentVer == 0)
 551    {
 552       if (State.Mode == ModeDelete &&
 553           (State.iFlags | Purge) == Purge && Pkg.Purge() == false)
 554          iDelCount += Add;
 555
 556       if (State.Mode == ModeInstall)
 557          iInstCount += Add;
 558       return;
 559    }
 560
 561    // Installed, no upgrade
 562    if (State.Status == 0)
 563    {
 564       if (State.Mode == ModeDelete)
 565          iDelCount += Add;
 566       else
 567          if ((State.iFlags & ReInstall) == ReInstall)
 568             iInstCount += Add;
 569
 570       return;
 571    }
 572
 573    // Alll 3 are possible
 574    if (State.Mode == ModeDelete)
 575       iDelCount += Add;
 576    if (State.Mode == ModeKeep)
 577       iKeepCount += Add;
 578    if (State.Mode == ModeInstall)
 579       iInstCount += Add;
 580 }
 581                                                                         /*}}}*/
 582 // DepCache::BuildGroupOrs - Generate the Or group dep data             /*{{{*/
 583 // ---------------------------------------------------------------------
 584 /* The or group results are stored in the last item of the or group. This
 585    allows easy detection of the state of a whole or'd group. */
 586 void pkgDepCache::BuildGroupOrs(VerIterator const &V)
 587 {
 588    unsigned char Group = 0;
 589
 590    for (DepIterator D = V.DependsList(); D.end() != true; D++)
 591    {
 592       // Build the dependency state.
 593       unsigned char &State = DepState[D->ID];
 594
 595       /* Invert for Conflicts. We have to do this twice to get the
 596          right sense for a conflicts group */
 597       if (D->Type == Dep::Conflicts ||
 598           D->Type == Dep::DpkgBreaks ||
 599           D->Type == Dep::Obsoletes)
 600          State = ~State;
 601
 602       // Add to the group if we are within an or..
 603       State &= 0x7;
 604       Group |= State;
 605       State |= Group << 3;
 606       if ((D->CompareOp & Dep::Or) != Dep::Or)
 607          Group = 0;
 608
 609       // Invert for Conflicts
 610       if (D->Type == Dep::Conflicts ||
 611           D->Type == Dep::DpkgBreaks ||
 612           D->Type == Dep::Obsoletes)
 613          State = ~State;
 614    }
 615 }
 616                                                                         /*}}}*/
 617 // DepCache::VersionState - Perform a pass over a dependency list       /*{{{*/
 618 // ---------------------------------------------------------------------
 619 /* This is used to run over a dependency list and determine the dep
 620    state of the list, filtering it through both a Min check and a Policy
 621    check. The return result will have SetMin/SetPolicy low if a check
 622    fails. It uses the DepState cache for it's computations. */
 623 unsigned char pkgDepCache::VersionState(DepIterator D,unsigned char Check,
 624                                        unsigned char SetMin,
 625                                        unsigned char SetPolicy)
 626 {
 627    unsigned char Dep = 0xFF;
 628
 629    while (D.end() != true)
 630    {
 631       // Compute a single dependency element (glob or)
 632       DepIterator Start = D;
 633       unsigned char State = 0;
 634       for (bool LastOR = true; D.end() == false && LastOR == true; D++)
 635       {
 636          State |= DepState[D->ID];
 637          LastOR = (D->CompareOp & Dep::Or) == Dep::Or;
 638       }
 639
 640       // Minimum deps that must be satisfied to have a working package
 641       if (Start.IsCritical() == true)
 642          if ((State & Check) != Check)
 643             Dep &= ~SetMin;
 644
 645       // Policy deps that must be satisfied to install the package
 646       if (IsImportantDep(Start) == true &&
 647           (State & Check) != Check)
 648          Dep &= ~SetPolicy;
 649    }
 650
 651    return Dep;
 652 }
 653                                                                         /*}}}*/
 654 // DepCache::DependencyState - Compute the 3 results for a dep          /*{{{*/
 655 // ---------------------------------------------------------------------
 656 /* This is the main dependency computation bit. It computes the 3 main
 657    results for a dependencys, Now, Install and Candidate. Callers must
 658    invert the result if dealing with conflicts. */
 659 unsigned char pkgDepCache::DependencyState(DepIterator &D)
 660 {
 661    unsigned char State = 0;
 662
 663    if (CheckDep(D,NowVersion) == true)
 664       State |= DepNow;
 665    if (CheckDep(D,InstallVersion) == true)
 666       State |= DepInstall;
 667    if (CheckDep(D,CandidateVersion) == true)
 668       State |= DepCVer;
 669
 670    return State;
 671 }
 672                                                                         /*}}}*/
 673 // DepCache::UpdateVerState - Compute the Dep member of the state       /*{{{*/
 674 // ---------------------------------------------------------------------
 675 /* This determines the combined dependency representation of a package
 676    for its two states now and install. This is done by using the pre-generated
 677    dependency information. */
 678 void pkgDepCache::UpdateVerState(PkgIterator Pkg)
 679 {
 680    // Empty deps are always true
 681    StateCache &State = PkgState[Pkg->ID];
 682    State.DepState = 0xFF;
 683
 684    // Check the Current state
 685    if (Pkg->CurrentVer != 0)
 686    {
 687       DepIterator D = Pkg.CurrentVer().DependsList();
 688       State.DepState &= VersionState(D,DepNow,DepNowMin,DepNowPolicy);
 689    }
 690
 691    /* Check the candidate state. We do not compare against the whole as
 692       a candidate state but check the candidate version against the
 693       install states */
 694    if (State.CandidateVer != 0)
 695    {
 696       DepIterator D = State.CandidateVerIter(*this).DependsList();
 697       State.DepState &= VersionState(D,DepInstall,DepCandMin,DepCandPolicy);
 698    }
 699
 700    // Check target state which can only be current or installed
 701    if (State.InstallVer != 0)
 702    {
 703       DepIterator D = State.InstVerIter(*this).DependsList();
 704       State.DepState &= VersionState(D,DepInstall,DepInstMin,DepInstPolicy);
 705    }
 706 }
 707                                                                         /*}}}*/
 708 // DepCache::Update - Figure out all the state information              /*{{{*/
 709 // ---------------------------------------------------------------------
 710 /* This will figure out the state of all the packages and all the
 711    dependencies based on the current policy. */
 712 void pkgDepCache::Update(OpProgress *Prog)
 713 {
 714    iUsrSize = 0;
 715    iDownloadSize = 0;
 716    iDelCount = 0;
 717    iInstCount = 0;
 718    iKeepCount = 0;
 719    iBrokenCount = 0;
 720    iBadCount = 0;
 721
 722    // Perform the depends pass
 723    int Done = 0;
 724    for (PkgIterator I = PkgBegin(); I.end() != true; I++,Done++)
 725    {
 726       if (Prog != 0 && Done%20 == 0)
 727          Prog->Progress(Done);
 728       for (VerIterator V = I.VersionList(); V.end() != true; V++)
 729       {
 730          unsigned char Group = 0;
 731
 732          for (DepIterator D = V.DependsList(); D.end() != true; D++)
 733          {
 734             // Build the dependency state.
 735             unsigned char &State = DepState[D->ID];
 736             State = DependencyState(D);
 737
 738             // Add to the group if we are within an or..
 739             Group |= State;
 740             State |= Group << 3;
 741             if ((D->CompareOp & Dep::Or) != Dep::Or)
 742                Group = 0;
 743
 744             // Invert for Conflicts
 745             if (D->Type == Dep::Conflicts ||
 746                 D->Type == Dep::DpkgBreaks ||
 747                 D->Type == Dep::Obsoletes)
 748                State = ~State;
 749          }
 750       }
 751
 752       // Compute the package dependency state and size additions
 753       AddSizes(I);
 754       UpdateVerState(I);
 755       AddStates(I);
 756    }
 757
 758    if (Prog != 0)
 759       Prog->Progress(Done);
 760
 761    readStateFile(Prog);
 762 }
 763                                                                         /*}}}*/
 764 // DepCache::Update - Update the deps list of a package                 /*{{{*/
 765 // ---------------------------------------------------------------------
 766 /* This is a helper for update that only does the dep portion of the scan.
 767    It is mainly meant to scan reverse dependencies. */
 768 void pkgDepCache::Update(DepIterator D)
 769 {
 770    // Update the reverse deps
 771    for (;D.end() != true; D++)
 772    {
 773       unsigned char &State = DepState[D->ID];
 774       State = DependencyState(D);
 775
 776       // Invert for Conflicts
 777       if (D->Type == Dep::Conflicts ||
 778           D->Type == Dep::DpkgBreaks ||
 779           D->Type == Dep::Obsoletes)
 780          State = ~State;
 781
 782       RemoveStates(D.ParentPkg());
 783       BuildGroupOrs(D.ParentVer());
 784       UpdateVerState(D.ParentPkg());
 785       AddStates(D.ParentPkg());
 786    }
 787 }
 788                                                                         /*}}}*/
 789 // DepCache::Update - Update the related deps of a package              /*{{{*/
 790 // ---------------------------------------------------------------------
 791 /* This is called whenever the state of a package changes. It updates
 792    all cached dependencies related to this package. */
 793 void pkgDepCache::Update(PkgIterator const &Pkg)
 794 {
 795    // Recompute the dep of the package
 796    RemoveStates(Pkg);
 797    UpdateVerState(Pkg);
 798    AddStates(Pkg);
 799
 800    // Update the reverse deps
 801    Update(Pkg.RevDependsList());
 802
 803    // Update the provides map for the current ver
 804    if (Pkg->CurrentVer != 0)
 805       for (PrvIterator P = Pkg.CurrentVer().ProvidesList();
 806            P.end() != true; P++)
 807          Update(P.ParentPkg().RevDependsList());
 808
 809    // Update the provides map for the candidate ver
 810    if (PkgState[Pkg->ID].CandidateVer != 0)
 811       for (PrvIterator P = PkgState[Pkg->ID].CandidateVerIter(*this).ProvidesList();
 812            P.end() != true; P++)
 813          Update(P.ParentPkg().RevDependsList());
 814 }
 815                                                                         /*}}}*/
 816 // DepCache::MarkKeep - Put the package in the keep state               /*{{{*/
 817 // ---------------------------------------------------------------------
 818 /* */
 819 void pkgDepCache::MarkKeep(PkgIterator const &Pkg, bool Soft, bool FromUser,
 820                            unsigned long Depth)
 821 {
 822    if (IsModeChangeOk(ModeKeep, Pkg, Depth, FromUser) == false)
 823       return;
 824
 825    /* Reject an attempt to keep a non-source broken installed package, those
 826       must be upgraded */
 827    if (Pkg.State() == PkgIterator::NeedsUnpack &&
 828        Pkg.CurrentVer().Downloadable() == false)
 829       return;
 830
 831    /* We changed the soft state all the time so the UI is a bit nicer
 832       to use */
 833    StateCache &P = PkgState[Pkg->ID];
 834
 835    // Check that it is not already kept
 836    if (P.Mode == ModeKeep)
 837       return;
 838
 839    if (Soft == true)
 840       P.iFlags |= AutoKept;
 841    else
 842       P.iFlags &= ~AutoKept;
 843
 844    ActionGroup group(*this);
 845
 846 #if 0 // reseting the autoflag here means we lose the
 847       // auto-mark information if a user selects a package for removal
 848       // but changes  his mind then and sets it for keep again
 849       // - this makes sense as default when all Garbage dependencies
 850       //   are automatically marked for removal (as aptitude does).
 851       //   setting a package for keep then makes it no longer autoinstalled
 852       //   for all other use-case this action is rather suprising
 853    if(FromUser && !P.Marked)
 854      P.Flags &= ~Flag::Auto;
 855 #endif
 856
 857    if (DebugMarker == true)
 858       std::clog << OutputInDepth(Depth) << "MarkKeep " << Pkg << " FU=" << FromUser << std::endl;
 859
 860    RemoveSizes(Pkg);
 861    RemoveStates(Pkg);
 862
 863    P.Mode = ModeKeep;
 864    if (Pkg->CurrentVer == 0)
 865       P.InstallVer = 0;
 866    else
 867       P.InstallVer = Pkg.CurrentVer();
 868
 869    AddStates(Pkg);
 870
 871    Update(Pkg);
 872
 873    AddSizes(Pkg);
 874 }
 875                                                                         /*}}}*/
 876 // DepCache::MarkDelete - Put the package in the delete state           /*{{{*/
 877 // ---------------------------------------------------------------------
 878 /* */
 879 void pkgDepCache::MarkDelete(PkgIterator const &Pkg, bool rPurge,
 880                              unsigned long Depth, bool FromUser)
 881 {
 882    if (IsModeChangeOk(ModeDelete, Pkg, Depth, FromUser) == false)
 883       return;
 884
 885    StateCache &P = PkgState[Pkg->ID];
 886
 887    // Check that it is not already marked for delete
 888    if ((P.Mode == ModeDelete || P.InstallVer == 0) &&
 889        (Pkg.Purge() == true || rPurge == false))
 890       return;
 891
 892    // check if we are allowed to remove the package
 893    if (IsDeleteOk(Pkg,rPurge,Depth,FromUser) == false)
 894       return;
 895
 896    P.iFlags &= ~(AutoKept | Purge);
 897    if (rPurge == true)
 898       P.iFlags |= Purge;
 899
 900    ActionGroup group(*this);
 901
 902    if (DebugMarker == true)
 903       std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << Pkg << " FU=" << FromUser << std::endl;
 904
 905    RemoveSizes(Pkg);
 906    RemoveStates(Pkg);
 907
 908    if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
 909       P.Mode = ModeKeep;
 910    else
 911       P.Mode = ModeDelete;
 912    P.InstallVer = 0;
 913
 914    AddStates(Pkg);
 915    Update(Pkg);
 916    AddSizes(Pkg);
 917
 918 }
 919                                                                         /*}}}*/
 920 // DepCache::IsDeleteOk - check if it is ok to remove this package      /*{{{*/
 921 // ---------------------------------------------------------------------
 922 /* The default implementation tries to prevent deletion of install requests.
 923    dpkg holds are enforced by the private IsModeChangeOk */
 924 bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
 925                               unsigned long Depth, bool FromUser)
 926 {
 927    if (FromUser == false && Pkg->CurrentVer == 0)
 928    {
 929       StateCache &P = PkgState[Pkg->ID];
 930       if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
 931       {
 932          if (DebugMarker == true)
 933             std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << Pkg << std::endl;
 934          return false;
 935       }
 936    }
 937    return true;
 938 }
 939                                                                         /*}}}*/
 940 // DepCache::IsModeChangeOk - check if it is ok to change the mode      /*{{{*/
 941 // ---------------------------------------------------------------------
 942 /* this is used by all Mark methods on the very first line to check sanity
 943    and prevents mode changes for packages on hold for example.
 944    If you want to check Mode specific stuff you can use the virtual public
 945    Is<Mode>Ok methods instead */
 946 char const* PrintMode(char const mode)
 947 {
 948          switch (mode)
 949          {
 950          case pkgDepCache::ModeInstall: return "Install";
 951          case pkgDepCache::ModeKeep: return "Keep";
 952          case pkgDepCache::ModeDelete: return "Delete";
 953          default: return "UNKNOWN";
 954          }
 955 }
 956 bool pkgDepCache::IsModeChangeOk(ModeList const mode, PkgIterator const &Pkg,
 957                                  unsigned long const Depth, bool const FromUser)
 958 {
 959    // we are not trying to hard…
 960    if (unlikely(Depth > 100))
 961       return false;
 962
 963    // general sanity
 964    if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
 965       return false;
 966
 967    // enforce dpkg holds
 968    if (FromUser == false && mode != ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
 969             _config->FindB("APT::Ignore-Hold",false) == false)
 970    {
 971       if (unlikely(DebugMarker == true) && PkgState[Pkg->ID].Mode != mode)
 972          std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
 973                    << " of " << Pkg << std::endl;
 974       return false;
 975    }
 976
 977    return true;
 978 }
 979                                                                         /*}}}*/
 980 // DepCache::MarkInstall - Put the package in the install state         /*{{{*/
 981 // ---------------------------------------------------------------------
 982 /* */
 983 void pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 984                               unsigned long Depth, bool FromUser,
 985                               bool ForceImportantDeps)
 986 {
 987    if (IsModeChangeOk(ModeInstall, Pkg, Depth, FromUser) == false)
 988       return;
 989
 990    StateCache &P = PkgState[Pkg->ID];
 991
 992    // See if there is even any possible instalation candidate
 993    if (P.CandidateVer == 0)
 994       return;
 995
 996    /* Check that it is not already marked for install and that it can be
 997       installed */
 998    if ((P.InstPolicyBroken() == false && P.InstBroken() == false) &&
 999        (P.Mode == ModeInstall ||
1000         P.CandidateVer == (Version *)Pkg.CurrentVer()))
1001    {
1002       if (P.CandidateVer == (Version *)Pkg.CurrentVer() && P.InstallVer == 0)
1003          MarkKeep(Pkg, false, FromUser, Depth+1);
1004       return;
1005    }
1006
1007    // check if we are allowed to install the package
1008    if (IsInstallOk(Pkg,AutoInst,Depth,FromUser) == false)
1009       return;
1010
1011    ActionGroup group(*this);
1012    P.iFlags &= ~AutoKept;
1013
1014    /* Target the candidate version and remove the autoflag. We reset the
1015       autoflag below if this was called recursively. Otherwise the user
1016       should have the ability to de-auto a package by changing its state */
1017    RemoveSizes(Pkg);
1018    RemoveStates(Pkg);
1019
1020    P.Mode = ModeInstall;
1021    P.InstallVer = P.CandidateVer;
1022
1023    if(FromUser)
1024      {
1025        // Set it to manual if it's a new install or already installed,
1026        // but only if its not marked by the autoremover (aptitude depend on this behavior)
1027        // or if we do automatic installation (aptitude never does it)
1028        if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
1029          P.Flags &= ~Flag::Auto;
1030      }
1031    else
1032      {
1033        // Set it to auto if this is a new install.
1034        if(P.Status == 2)
1035          P.Flags |= Flag::Auto;
1036      }
1037    if (P.CandidateVer == (Version *)Pkg.CurrentVer())
1038       P.Mode = ModeKeep;
1039
1040    AddStates(Pkg);
1041    Update(Pkg);
1042    AddSizes(Pkg);
1043
1044    if (AutoInst == false)
1045       return;
1046
1047    if (DebugMarker == true)
1048       std::clog << OutputInDepth(Depth) << "MarkInstall " << Pkg << " FU=" << FromUser << std::endl;
1049
1050    DepIterator Dep = P.InstVerIter(*this).DependsList();
1051    for (; Dep.end() != true;)
1052    {
1053       // Grok or groups
1054       DepIterator Start = Dep;
1055       bool Result = true;
1056       unsigned Ors = 0;
1057       for (bool LastOR = true; Dep.end() == false && LastOR == true; Dep++,Ors++)
1058       {
1059          LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
1060
1061          if ((DepState[Dep->ID] & DepInstall) == DepInstall)
1062             Result = false;
1063       }
1064
1065       // Dep is satisfied okay.
1066       if (Result == false)
1067          continue;
1068
1069       /* Check if this dep should be consider for install. If it is a user
1070          defined important dep and we are installed a new package then
1071          it will be installed. Otherwise we only check for important
1072          deps that have changed from the installed version
1073       */
1074       if (IsImportantDep(Start) == false)
1075          continue;
1076
1077       /* Check if any ImportantDep() (but not Critical) were added
1078        * since we installed the package.  Also check for deps that
1079        * were satisfied in the past: for instance, if a version
1080        * restriction in a Recommends was tightened, upgrading the
1081        * package should follow that Recommends rather than causing the
1082        * dependency to be removed. (bug #470115)
1083        */
1084       bool isNewImportantDep = false;
1085       bool isPreviouslySatisfiedImportantDep = false;
1086       if(!ForceImportantDeps && !Start.IsCritical())
1087       {
1088          bool found=false;
1089          VerIterator instVer = Pkg.CurrentVer();
1090          if(!instVer.end())
1091          {
1092            for (DepIterator D = instVer.DependsList(); D.end() != true; D++)
1093              {
1094                //FIXME: deal better with or-groups(?)
1095                if(IsImportantDep(D) && !D.IsCritical() &&
1096                   Start.TargetPkg() == D.TargetPkg())
1097                  {
1098                    if(!isPreviouslySatisfiedImportantDep)
1099                      {
1100                        DepIterator D2 = D;
1101                        while((D2->CompareOp & Dep::Or) != 0)
1102                          ++D2;
1103
1104                        isPreviouslySatisfiedImportantDep =
1105                          (((*this)[D2] & DepGNow) != 0);
1106                      }
1107
1108                    found=true;
1109                  }
1110              }
1111             // this is a new dep if it was not found to be already
1112             // a important dep of the installed pacakge
1113             isNewImportantDep = !found;
1114          }
1115       }
1116       if(isNewImportantDep)
1117          if(DebugAutoInstall == true)
1118             std::clog << OutputInDepth(Depth) << "new important dependency: "
1119                       << Start.TargetPkg().Name() << std::endl;
1120       if(isPreviouslySatisfiedImportantDep)
1121         if(DebugAutoInstall == true)
1122           std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
1123                     << Start.TargetPkg().Name() << std::endl;
1124
1125       // skip important deps if the package is already installed
1126       if (Pkg->CurrentVer != 0 && Start.IsCritical() == false
1127           && !isNewImportantDep && !isPreviouslySatisfiedImportantDep
1128           && !ForceImportantDeps)
1129          continue;
1130
1131       /* If we are in an or group locate the first or that can
1132          succeed. We have already cached this.. */
1133       for (; Ors > 1 && (DepState[Start->ID] & DepCVer) != DepCVer; Ors--)
1134          Start++;
1135
1136       /* This bit is for processing the possibilty of an install/upgrade
1137          fixing the problem */
1138       SPtrArray<Version *> List = Start.AllTargets();
1139       if (Start->Type != Dep::DpkgBreaks &&
1140           (DepState[Start->ID] & DepCVer) == DepCVer)
1141       {
1142          // Right, find the best version to install..
1143          Version **Cur = List;
1144          PkgIterator P = Start.TargetPkg();
1145          PkgIterator InstPkg(*Cache,0);
1146
1147          // See if there are direct matches (at the start of the list)
1148          for (; *Cur != 0 && (*Cur)->ParentPkg == P.Index(); Cur++)
1149          {
1150             PkgIterator Pkg(*Cache,Cache->PkgP + (*Cur)->ParentPkg);
1151             if (PkgState[Pkg->ID].CandidateVer != *Cur)
1152                continue;
1153             InstPkg = Pkg;
1154             break;
1155          }
1156
1157          // Select the highest priority providing package
1158          if (InstPkg.end() == true)
1159          {
1160             pkgPrioSortList(*Cache,Cur);
1161             for (; *Cur != 0; Cur++)
1162             {
1163                PkgIterator Pkg(*Cache,Cache->PkgP + (*Cur)->ParentPkg);
1164                if (PkgState[Pkg->ID].CandidateVer != *Cur)
1165                   continue;
1166                InstPkg = Pkg;
1167                break;
1168             }
1169          }
1170
1171          if (InstPkg.end() == false)
1172          {
1173             if(DebugAutoInstall == true)
1174                std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.Name()
1175                          << " as " << Start.DepType() << " of " << Pkg.Name()
1176                          << std::endl;
1177             // now check if we should consider it a automatic dependency or not
1178             if(Pkg.Section() && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
1179             {
1180                if(DebugAutoInstall == true)
1181                   std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "
1182                             << Start.DepType() << " of pkg in APT::Never-MarkAuto-Sections)" << std::endl;
1183                MarkInstall(InstPkg,true,Depth + 1, true);
1184             }
1185             else
1186             {
1187                // mark automatic dependency
1188                MarkInstall(InstPkg,true,Depth + 1, false, ForceImportantDeps);
1189                // Set the autoflag, after MarkInstall because MarkInstall unsets it
1190                if (P->CurrentVer == 0)
1191                   PkgState[InstPkg->ID].Flags |= Flag::Auto;
1192             }
1193          }
1194          continue;
1195       }
1196
1197       /* For conflicts we just de-install the package and mark as auto,
1198          Conflicts may not have or groups.  For dpkg's Breaks we try to
1199          upgrade the package. */
1200       if (Start->Type == Dep::Conflicts || Start->Type == Dep::Obsoletes ||
1201           Start->Type == Dep::DpkgBreaks)
1202       {
1203          for (Version **I = List; *I != 0; I++)
1204          {
1205             VerIterator Ver(*this,*I);
1206             PkgIterator Pkg = Ver.ParentPkg();
1207
1208             /* The List includes all packages providing this dependency,
1209                even providers which are not installed, so skip them. */
1210             if (PkgState[Pkg->ID].InstallVer == 0)
1211                continue;
1212
1213             if (PkgState[Pkg->ID].CandidateVer != *I &&
1214                 Start->Type == Dep::DpkgBreaks)
1215                MarkInstall(Pkg,true,Depth + 1, false, ForceImportantDeps);
1216             else
1217                MarkDelete(Pkg,false,Depth + 1, false);
1218          }
1219          continue;
1220       }
1221    }
1222 }
1223                                                                         /*}}}*/
1224 // DepCache::IsInstallOk - check if it is ok to install this package    /*{{{*/
1225 // ---------------------------------------------------------------------
1226 /* The default implementation does nothing.
1227    dpkg holds are enforced by the private IsModeChangeOk */
1228 bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
1229                               unsigned long Depth, bool FromUser)
1230 {
1231    return true;
1232 }
1233                                                                         /*}}}*/
1234 // DepCache::SetReInstall - Set the reinstallation flag                 /*{{{*/
1235 // ---------------------------------------------------------------------
1236 /* */
1237 void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
1238 {
1239    if (unlikely(Pkg.end() == true))
1240       return;
1241
1242    ActionGroup group(*this);
1243
1244    RemoveSizes(Pkg);
1245    RemoveStates(Pkg);
1246
1247    StateCache &P = PkgState[Pkg->ID];
1248    if (To == true)
1249       P.iFlags |= ReInstall;
1250    else
1251       P.iFlags &= ~ReInstall;
1252
1253    AddStates(Pkg);
1254    AddSizes(Pkg);
1255 }
1256                                                                         /*}}}*/
1257 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1258 // ---------------------------------------------------------------------
1259 /* */
1260 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer, bool const &Pseudo)
1261 {
1262    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1263    StateCache &P = PkgState[Pkg->ID];
1264
1265    if (P.CandidateVer == TargetVer)
1266       return;
1267
1268    ActionGroup group(*this);
1269
1270    RemoveSizes(Pkg);
1271    RemoveStates(Pkg);
1272
1273    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1274       P.InstallVer = (Version *)TargetVer;
1275    P.CandidateVer = (Version *)TargetVer;
1276    P.Update(Pkg,*this);
1277
1278    AddStates(Pkg);
1279    Update(Pkg);
1280    AddSizes(Pkg);
1281
1282 }
1283                                                                         /*}}}*/
1284 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1285 // ---------------------------------------------------------------------
1286 /* changes the candidate of a package and walks over all its dependencies
1287    to check if it needs to change the candidate of the dependency, too,
1288    to reach a installable versionstate */
1289 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1290                                         std::string const &TargetRel)
1291 {
1292    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1293    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1294 }
1295 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1296                                         std::string const &TargetRel,
1297                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1298 {
1299    ActionGroup group(*this);
1300    SetCandidateVersion(TargetVer);
1301
1302    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1303       return true;
1304
1305    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1306    // save the position of the last element we will not undo - if we have to
1307    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1308
1309    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1310    {
1311       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1312           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1313            IsImportantDep(D) == false))
1314          continue;
1315
1316       // walk over an or-group and check if we need to do anything
1317       // for simpilicity no or-group is handled as a or-group including one dependency
1318       pkgCache::DepIterator Start = D;
1319       bool itsFine = false;
1320       for (bool stillOr = true; stillOr == true; ++Start)
1321       {
1322          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1323          pkgCache::PkgIterator const P = Start.TargetPkg();
1324          // virtual packages can't be a solution
1325          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1326             continue;
1327          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1328          // no versioned dependency - but is it installable?
1329          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1330          {
1331             // Check if one of the providers is installable
1332             if (P->ProvidesList != 0)
1333             {
1334                pkgCache::PrvIterator Prv = P.ProvidesList();
1335                for (; Prv.end() == false; ++Prv)
1336                {
1337                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1338                   if (C.end() == true || C != Prv.OwnerVer() ||
1339                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1340                      continue;
1341                   break;
1342                }
1343                if (Prv.end() == true)
1344                   continue;
1345             }
1346             // no providers, so check if we have an installable candidate version
1347             else if (Cand.end() == true ||
1348                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1349                continue;
1350             itsFine = true;
1351             break;
1352          }
1353          if (Cand.end() == true)
1354             continue;
1355          // check if the current candidate is enough for the versioned dependency - and installable?
1356          if (VS().CheckDep(P.CandVersion(), Start->CompareOp, Start.TargetVer()) == true &&
1357              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1358          {
1359             itsFine = true;
1360             break;
1361          }
1362       }
1363
1364       if (itsFine == true) {
1365          // something in the or-group was fine, skip all other members
1366          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1367          continue;
1368       }
1369
1370       // walk again over the or-group and check each if a candidate switch would help
1371       itsFine = false;
1372       for (bool stillOr = true; stillOr == true; ++D)
1373       {
1374          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1375          // changing candidate will not help if the dependency is not versioned
1376          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1377          {
1378             if (stillOr == true)
1379                continue;
1380             break;
1381          }
1382
1383          pkgCache::VerIterator V;
1384          if (TargetRel == "newest")
1385             V = D.TargetPkg().VersionList();
1386          else
1387             V = Match.Find(D.TargetPkg());
1388
1389          // check if the version from this release could satisfy the dependency
1390          if (V.end() == true || VS().CheckDep(V.VerStr(), D->CompareOp, D.TargetVer()) == false)
1391          {
1392             if (stillOr == true)
1393                continue;
1394             break;
1395          }
1396
1397          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1398          if (V == oldCand)
1399          {
1400             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1401             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1402                  c != Changed.end(); ++c)
1403             {
1404                if (c->first->ParentPkg != V->ParentPkg)
1405                   continue;
1406                itsFine = true;
1407                break;
1408             }
1409          }
1410
1411          if (itsFine == false)
1412          {
1413             // change the candidate
1414             Changed.push_back(make_pair(oldCand, TargetVer));
1415             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1416             {
1417                if (stillOr == false)
1418                   break;
1419                // undo the candidate changing
1420                SetCandidateVersion(oldCand);
1421                Changed.pop_back();
1422                continue;
1423             }
1424             itsFine = true;
1425          }
1426
1427          // something in the or-group was fine, skip all other members
1428          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1429          break;
1430       }
1431
1432       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1433       {
1434          // undo all changes which aren't lead to a solution
1435          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1436               c != Changed.end(); ++c)
1437             SetCandidateVersion(c->first);
1438          Changed.erase(newChanged, Changed.end());
1439          return false;
1440       }
1441    }
1442    return true;
1443 }
1444                                                                         /*}}}*/
1445 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1446 // ---------------------------------------------------------------------
1447 /* */
1448 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1449 {
1450   StateCache &state = PkgState[Pkg->ID];
1451
1452   ActionGroup group(*this);
1453
1454   if(Auto)
1455     state.Flags |= Flag::Auto;
1456   else
1457     state.Flags &= ~Flag::Auto;
1458 }
1459                                                                         /*}}}*/
1460 // StateCache::Update - Compute the various static display things       /*{{{*/
1461 // ---------------------------------------------------------------------
1462 /* This is called whenever the Candidate version changes. */
1463 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1464 {
1465    // Some info
1466    VerIterator Ver = CandidateVerIter(Cache);
1467
1468    // Use a null string or the version string
1469    if (Ver.end() == true)
1470       CandVersion = "";
1471    else
1472       CandVersion = Ver.VerStr();
1473
1474    // Find the current version
1475    CurVersion = "";
1476    if (Pkg->CurrentVer != 0)
1477       CurVersion = Pkg.CurrentVer().VerStr();
1478
1479    // Strip off the epochs for display
1480    CurVersion = StripEpoch(CurVersion);
1481    CandVersion = StripEpoch(CandVersion);
1482
1483    // Figure out if its up or down or equal
1484    Status = Ver.CompareVer(Pkg.CurrentVer());
1485    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1486      Status = 2;
1487 }
1488                                                                         /*}}}*/
1489 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1490 // ---------------------------------------------------------------------
1491 /* */
1492 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1493 {
1494    if (Ver == 0)
1495       return 0;
1496
1497    // Strip any epoch
1498    for (const char *I = Ver; *I != 0; I++)
1499       if (*I == ':')
1500          return I + 1;
1501    return Ver;
1502 }
1503                                                                         /*}}}*/
1504 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1505 // ---------------------------------------------------------------------
1506 /* The default just returns the highest available version that is not
1507    a source and automatic. */
1508 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1509 {
1510    /* Not source/not automatic versions cannot be a candidate version
1511       unless they are already installed */
1512    VerIterator Last(*(pkgCache *)this,0);
1513
1514    for (VerIterator I = Pkg.VersionList(); I.end() == false; I++)
1515    {
1516       if (Pkg.CurrentVer() == I)
1517          return I;
1518
1519       for (VerFileIterator J = I.FileList(); J.end() == false; J++)
1520       {
1521          if ((J.File()->Flags & Flag::NotSource) != 0)
1522             continue;
1523
1524          /* Stash the highest version of a not-automatic source, we use it
1525             if there is nothing better */
1526          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1527              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1528          {
1529             if (Last.end() == true)
1530                Last = I;
1531             continue;
1532          }
1533
1534          return I;
1535       }
1536    }
1537
1538    return Last;
1539 }
1540                                                                         /*}}}*/
1541 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1542 // ---------------------------------------------------------------------
1543 /* */
1544 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1545 {
1546    if(Dep.IsCritical())
1547       return true;
1548    else if(Dep->Type == pkgCache::Dep::Recommends)
1549    {
1550       if ( _config->FindB("APT::Install-Recommends", false))
1551          return true;
1552       // we suport a special mode to only install-recommends for certain
1553       // sections
1554       // FIXME: this is a meant as a temporarly solution until the
1555       //        recommends are cleaned up
1556       const char *sec = Dep.ParentVer().Section();
1557       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1558          return true;
1559    }
1560    else if(Dep->Type == pkgCache::Dep::Suggests)
1561      return _config->FindB("APT::Install-Suggests", false);
1562
1563    return false;
1564 }
1565                                                                         /*}}}*/
1566 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1567 {
1568   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1569   if(f->wasConstructedSuccessfully())
1570     return f;
1571   else
1572     {
1573       delete f;
1574       return NULL;
1575     }
1576 }
1577                                                                         /*}}}*/
1578 bool pkgDepCache::MarkFollowsRecommends()
1579 {
1580   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1581 }
1582
1583 bool pkgDepCache::MarkFollowsSuggests()
1584 {
1585   return _config->FindB("APT::AutoRemove::SuggestsImportant", false);
1586 }
1587
1588 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1589 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1590 {
1591    bool follow_recommends;
1592    bool follow_suggests;
1593    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1594
1595    // init the states
1596    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1597    {
1598       PkgState[p->ID].Marked  = false;
1599       PkgState[p->ID].Garbage = false;
1600
1601       // debug output
1602       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1603          std::clog << "AutoDep: " << p.FullName() << std::endl;
1604    }
1605
1606    // init vars
1607    follow_recommends = MarkFollowsRecommends();
1608    follow_suggests   = MarkFollowsSuggests();
1609
1610
1611
1612    // do the mark part, this is the core bit of the algorithm
1613    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1614    {
1615       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1616           (p->Flags & Flag::Essential) ||
1617           userFunc.InRootSet(p) ||
1618           // be nice even then a required package violates the policy (#583517)
1619           // and do the full mark process also for required packages
1620           (p.CurrentVer().end() != true &&
1621            p.CurrentVer()->Priority == pkgCache::State::Required))
1622       {
1623          // the package is installed (and set to keep)
1624          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1625             MarkPackage(p, p.CurrentVer(),
1626                         follow_recommends, follow_suggests);
1627          // the package is to be installed
1628          else if(PkgState[p->ID].Install())
1629             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1630                         follow_recommends, follow_suggests);
1631       }
1632    }
1633
1634    return true;
1635 }
1636                                                                         /*}}}*/
1637 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1638 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1639                               const pkgCache::VerIterator &ver,
1640                               bool const &follow_recommends,
1641                               bool const &follow_suggests)
1642 {
1643    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1644
1645    // if we are marked already we are done
1646    if(state.Marked)
1647       return;
1648
1649    VerIterator const currver = pkg.CurrentVer();
1650    VerIterator const instver = state.InstVerIter(*this);
1651
1652 #if 0
1653    VerIterator const candver = state.CandidateVerIter(*this);
1654
1655    // If a package was garbage-collected but is now being marked, we
1656    // should re-select it
1657    // For cases when a pkg is set to upgrade and this trigger the
1658    // removal of a no-longer used dependency.  if the pkg is set to
1659    // keep again later it will result in broken deps
1660    if(state.Delete() && state.RemoveReason = Unused)
1661    {
1662       if(ver==candver)
1663          mark_install(pkg, false, false, NULL);
1664       else if(ver==pkg.CurrentVer())
1665          MarkKeep(pkg, false, false);
1666
1667       instver=state.InstVerIter(*this);
1668    }
1669 #endif
1670
1671    // For packages that are not going to be removed, ignore versions
1672    // other than the InstVer.  For packages that are going to be
1673    // removed, ignore versions other than the current version.
1674    if(!(ver == instver && !instver.end()) &&
1675       !(ver == currver && instver.end() && !ver.end()))
1676       return;
1677
1678    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1679
1680    if(debug_autoremove)
1681      {
1682        std::clog << "Marking: " << pkg.FullName();
1683        if(!ver.end())
1684          std::clog << " " << ver.VerStr();
1685        if(!currver.end())
1686          std::clog << ", Curr=" << currver.VerStr();
1687        if(!instver.end())
1688          std::clog << ", Inst=" << instver.VerStr();
1689        std::clog << std::endl;
1690      }
1691
1692    state.Marked=true;
1693
1694    if(ver.end() == true)
1695       return;
1696
1697      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1698      {
1699         if(d->Type == Dep::Depends ||
1700            d->Type == Dep::PreDepends ||
1701            (follow_recommends &&
1702             d->Type == Dep::Recommends) ||
1703            (follow_suggests &&
1704             d->Type == Dep::Suggests))
1705         {
1706            // Try all versions of this package.
1707            for(VerIterator V = d.TargetPkg().VersionList();
1708                !V.end(); ++V)
1709            {
1710               if(_system->VS->CheckDep(V.VerStr(), d->CompareOp, d.TargetVer()))
1711               {
1712                 if(debug_autoremove)
1713                   {
1714                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1715                               << " " << d.ParentVer().VerStr() << " "
1716                               << d.DepType() << " " << d.TargetPkg().FullName();
1717                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1718                       {
1719                         std::clog << " (" << d.CompType() << " "
1720                                   << d.TargetVer() << ")";
1721                       }
1722                     std::clog << std::endl;
1723                   }
1724                  MarkPackage(V.ParentPkg(), V,
1725                              follow_recommends, follow_suggests);
1726               }
1727            }
1728            // Now try virtual packages
1729            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1730                !prv.end(); ++prv)
1731            {
1732               if(_system->VS->CheckDep(prv.ProvideVersion(), d->CompareOp,
1733                                        d.TargetVer()))
1734               {
1735                 if(debug_autoremove)
1736                   {
1737                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1738                               << d.ParentVer().VerStr() << " "
1739                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1740                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1741                       {
1742                         std::clog << " (" << d.CompType() << " "
1743                                   << d.TargetVer() << ")";
1744                       }
1745                     std::clog << ", provided by "
1746                               << prv.OwnerPkg().FullName() << " "
1747                               << prv.OwnerVer().VerStr()
1748                               << std::endl;
1749                   }
1750
1751                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1752                              follow_recommends, follow_suggests);
1753               }
1754            }
1755         }
1756      }
1757 }
1758                                                                         /*}}}*/
1759 bool pkgDepCache::Sweep()                                               /*{{{*/
1760 {
1761    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1762
1763    // do the sweep
1764    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1765    {
1766      StateCache &state=PkgState[p->ID];
1767
1768      // skip required packages
1769      if (!p.CurrentVer().end() &&
1770          (p.CurrentVer()->Priority == pkgCache::State::Required))
1771         continue;
1772
1773      // if it is not marked and it is installed, it's garbage
1774      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1775      {
1776         state.Garbage=true;
1777         if(debug_autoremove)
1778            std::clog << "Garbage: " << p.FullName() << std::endl;
1779      }
1780   }
1781
1782    return true;
1783 }
1784                                                                         /*}}}*/