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    if (unlikely(Pkg.CurrentVer().end() == true))
1257       return;
1258
1259    SetReInstall(Pkg.Group().FindPkg("all"), To);
1260 }
1261                                                                         /*}}}*/
1262 // DepCache::SetCandidateVersion - Change the candidate version         /*{{{*/
1263 // ---------------------------------------------------------------------
1264 /* */
1265 void pkgDepCache::SetCandidateVersion(VerIterator TargetVer, bool const &Pseudo)
1266 {
1267    pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
1268    StateCache &P = PkgState[Pkg->ID];
1269
1270    if (P.CandidateVer == TargetVer)
1271       return;
1272
1273    ActionGroup group(*this);
1274
1275    RemoveSizes(Pkg);
1276    RemoveStates(Pkg);
1277
1278    if (P.CandidateVer == P.InstallVer && P.Install() == true)
1279       P.InstallVer = (Version *)TargetVer;
1280    P.CandidateVer = (Version *)TargetVer;
1281    P.Update(Pkg,*this);
1282
1283    AddStates(Pkg);
1284    Update(Pkg);
1285    AddSizes(Pkg);
1286
1287 }
1288                                                                         /*}}}*/
1289 // DepCache::SetCandidateRelease - Change the candidate version         /*{{{*/
1290 // ---------------------------------------------------------------------
1291 /* changes the candidate of a package and walks over all its dependencies
1292    to check if it needs to change the candidate of the dependency, too,
1293    to reach a installable versionstate */
1294 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1295                                         std::string const &TargetRel)
1296 {
1297    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
1298    return SetCandidateRelease(TargetVer, TargetRel, Changed);
1299 }
1300 bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
1301                                         std::string const &TargetRel,
1302                                         std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
1303 {
1304    ActionGroup group(*this);
1305    SetCandidateVersion(TargetVer);
1306
1307    if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
1308       return true;
1309
1310    pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
1311    // save the position of the last element we will not undo - if we have to
1312    std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
1313
1314    for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
1315    {
1316       if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
1317           ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
1318            IsImportantDep(D) == false))
1319          continue;
1320
1321       // walk over an or-group and check if we need to do anything
1322       // for simpilicity no or-group is handled as a or-group including one dependency
1323       pkgCache::DepIterator Start = D;
1324       bool itsFine = false;
1325       for (bool stillOr = true; stillOr == true; ++Start)
1326       {
1327          stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
1328          pkgCache::PkgIterator const P = Start.TargetPkg();
1329          // virtual packages can't be a solution
1330          if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
1331             continue;
1332          pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
1333          // no versioned dependency - but is it installable?
1334          if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
1335          {
1336             // Check if one of the providers is installable
1337             if (P->ProvidesList != 0)
1338             {
1339                pkgCache::PrvIterator Prv = P.ProvidesList();
1340                for (; Prv.end() == false; ++Prv)
1341                {
1342                   pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
1343                   if (C.end() == true || C != Prv.OwnerVer() ||
1344                       (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1345                      continue;
1346                   break;
1347                }
1348                if (Prv.end() == true)
1349                   continue;
1350             }
1351             // no providers, so check if we have an installable candidate version
1352             else if (Cand.end() == true ||
1353                 (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
1354                continue;
1355             itsFine = true;
1356             break;
1357          }
1358          if (Cand.end() == true)
1359             continue;
1360          // check if the current candidate is enough for the versioned dependency - and installable?
1361          if (VS().CheckDep(P.CandVersion(), Start->CompareOp, Start.TargetVer()) == true &&
1362              (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
1363          {
1364             itsFine = true;
1365             break;
1366          }
1367       }
1368
1369       if (itsFine == true) {
1370          // something in the or-group was fine, skip all other members
1371          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1372          continue;
1373       }
1374
1375       // walk again over the or-group and check each if a candidate switch would help
1376       itsFine = false;
1377       for (bool stillOr = true; stillOr == true; ++D)
1378       {
1379          stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
1380          // changing candidate will not help if the dependency is not versioned
1381          if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
1382          {
1383             if (stillOr == true)
1384                continue;
1385             break;
1386          }
1387
1388          pkgCache::VerIterator V;
1389          if (TargetRel == "newest")
1390             V = D.TargetPkg().VersionList();
1391          else
1392             V = Match.Find(D.TargetPkg());
1393
1394          // check if the version from this release could satisfy the dependency
1395          if (V.end() == true || VS().CheckDep(V.VerStr(), D->CompareOp, D.TargetVer()) == false)
1396          {
1397             if (stillOr == true)
1398                continue;
1399             break;
1400          }
1401
1402          pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
1403          if (V == oldCand)
1404          {
1405             // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
1406             for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
1407                  c != Changed.end(); ++c)
1408             {
1409                if (c->first->ParentPkg != V->ParentPkg)
1410                   continue;
1411                itsFine = true;
1412                break;
1413             }
1414          }
1415
1416          if (itsFine == false)
1417          {
1418             // change the candidate
1419             Changed.push_back(make_pair(oldCand, TargetVer));
1420             if (SetCandidateRelease(V, TargetRel, Changed) == false)
1421             {
1422                if (stillOr == false)
1423                   break;
1424                // undo the candidate changing
1425                SetCandidateVersion(oldCand);
1426                Changed.pop_back();
1427                continue;
1428             }
1429             itsFine = true;
1430          }
1431
1432          // something in the or-group was fine, skip all other members
1433          for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
1434          break;
1435       }
1436
1437       if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
1438       {
1439          // undo all changes which aren't lead to a solution
1440          for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
1441               c != Changed.end(); ++c)
1442             SetCandidateVersion(c->first);
1443          Changed.erase(newChanged, Changed.end());
1444          return false;
1445       }
1446    }
1447    return true;
1448 }
1449                                                                         /*}}}*/
1450 // DepCache::MarkAuto - set the Auto flag for a package                 /*{{{*/
1451 // ---------------------------------------------------------------------
1452 /* */
1453 void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
1454 {
1455   StateCache &state = PkgState[Pkg->ID];
1456
1457   ActionGroup group(*this);
1458
1459   if(Auto)
1460     state.Flags |= Flag::Auto;
1461   else
1462     state.Flags &= ~Flag::Auto;
1463 }
1464                                                                         /*}}}*/
1465 // StateCache::Update - Compute the various static display things       /*{{{*/
1466 // ---------------------------------------------------------------------
1467 /* This is called whenever the Candidate version changes. */
1468 void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
1469 {
1470    // Some info
1471    VerIterator Ver = CandidateVerIter(Cache);
1472
1473    // Use a null string or the version string
1474    if (Ver.end() == true)
1475       CandVersion = "";
1476    else
1477       CandVersion = Ver.VerStr();
1478
1479    // Find the current version
1480    CurVersion = "";
1481    if (Pkg->CurrentVer != 0)
1482       CurVersion = Pkg.CurrentVer().VerStr();
1483
1484    // Strip off the epochs for display
1485    CurVersion = StripEpoch(CurVersion);
1486    CandVersion = StripEpoch(CandVersion);
1487
1488    // Figure out if its up or down or equal
1489    Status = Ver.CompareVer(Pkg.CurrentVer());
1490    if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
1491      Status = 2;
1492 }
1493                                                                         /*}}}*/
1494 // StateCache::StripEpoch - Remove the epoch specifier from the version /*{{{*/
1495 // ---------------------------------------------------------------------
1496 /* */
1497 const char *pkgDepCache::StateCache::StripEpoch(const char *Ver)
1498 {
1499    if (Ver == 0)
1500       return 0;
1501
1502    // Strip any epoch
1503    for (const char *I = Ver; *I != 0; I++)
1504       if (*I == ':')
1505          return I + 1;
1506    return Ver;
1507 }
1508                                                                         /*}}}*/
1509 // Policy::GetCandidateVer - Returns the Candidate install version      /*{{{*/
1510 // ---------------------------------------------------------------------
1511 /* The default just returns the highest available version that is not
1512    a source and automatic. */
1513 pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
1514 {
1515    /* Not source/not automatic versions cannot be a candidate version
1516       unless they are already installed */
1517    VerIterator Last(*(pkgCache *)this,0);
1518
1519    for (VerIterator I = Pkg.VersionList(); I.end() == false; I++)
1520    {
1521       if (Pkg.CurrentVer() == I)
1522          return I;
1523
1524       for (VerFileIterator J = I.FileList(); J.end() == false; J++)
1525       {
1526          if ((J.File()->Flags & Flag::NotSource) != 0)
1527             continue;
1528
1529          /* Stash the highest version of a not-automatic source, we use it
1530             if there is nothing better */
1531          if ((J.File()->Flags & Flag::NotAutomatic) != 0 ||
1532              (J.File()->Flags & Flag::ButAutomaticUpgrades) != 0)
1533          {
1534             if (Last.end() == true)
1535                Last = I;
1536             continue;
1537          }
1538
1539          return I;
1540       }
1541    }
1542
1543    return Last;
1544 }
1545                                                                         /*}}}*/
1546 // Policy::IsImportantDep - True if the dependency is important         /*{{{*/
1547 // ---------------------------------------------------------------------
1548 /* */
1549 bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep)
1550 {
1551    if(Dep.IsCritical())
1552       return true;
1553    else if(Dep->Type == pkgCache::Dep::Recommends)
1554    {
1555       if ( _config->FindB("APT::Install-Recommends", false))
1556          return true;
1557       // we suport a special mode to only install-recommends for certain
1558       // sections
1559       // FIXME: this is a meant as a temporarly solution until the
1560       //        recommends are cleaned up
1561       const char *sec = Dep.ParentVer().Section();
1562       if (sec && ConfigValueInSubTree("APT::Install-Recommends-Sections", sec))
1563          return true;
1564    }
1565    else if(Dep->Type == pkgCache::Dep::Suggests)
1566      return _config->FindB("APT::Install-Suggests", false);
1567
1568    return false;
1569 }
1570                                                                         /*}}}*/
1571 pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()               /*{{{*/
1572 {
1573   DefaultRootSetFunc *f = new DefaultRootSetFunc;
1574   if(f->wasConstructedSuccessfully())
1575     return f;
1576   else
1577     {
1578       delete f;
1579       return NULL;
1580     }
1581 }
1582                                                                         /*}}}*/
1583 bool pkgDepCache::MarkFollowsRecommends()
1584 {
1585   return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
1586 }
1587
1588 bool pkgDepCache::MarkFollowsSuggests()
1589 {
1590   return _config->FindB("APT::AutoRemove::SuggestsImportant", false);
1591 }
1592
1593 // pkgDepCache::MarkRequired - the main mark algorithm                  /*{{{*/
1594 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
1595 {
1596    bool follow_recommends;
1597    bool follow_suggests;
1598    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1599
1600    // init the states
1601    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1602    {
1603       PkgState[p->ID].Marked  = false;
1604       PkgState[p->ID].Garbage = false;
1605
1606       // debug output
1607       if(debug_autoremove && PkgState[p->ID].Flags & Flag::Auto)
1608          std::clog << "AutoDep: " << p.FullName() << std::endl;
1609    }
1610
1611    // init vars
1612    follow_recommends = MarkFollowsRecommends();
1613    follow_suggests   = MarkFollowsSuggests();
1614
1615
1616
1617    // do the mark part, this is the core bit of the algorithm
1618    for(PkgIterator p = PkgBegin(); !p.end(); ++p)
1619    {
1620       if(!(PkgState[p->ID].Flags & Flag::Auto) ||
1621           (p->Flags & Flag::Essential) ||
1622           userFunc.InRootSet(p) ||
1623           // be nice even then a required package violates the policy (#583517)
1624           // and do the full mark process also for required packages
1625           (p.CurrentVer().end() != true &&
1626            p.CurrentVer()->Priority == pkgCache::State::Required))
1627       {
1628          // the package is installed (and set to keep)
1629          if(PkgState[p->ID].Keep() && !p.CurrentVer().end())
1630             MarkPackage(p, p.CurrentVer(),
1631                         follow_recommends, follow_suggests);
1632          // the package is to be installed
1633          else if(PkgState[p->ID].Install())
1634             MarkPackage(p, PkgState[p->ID].InstVerIter(*this),
1635                         follow_recommends, follow_suggests);
1636       }
1637    }
1638
1639    return true;
1640 }
1641                                                                         /*}}}*/
1642 // MarkPackage - mark a single package in Mark-and-Sweep                /*{{{*/
1643 void pkgDepCache::MarkPackage(const pkgCache::PkgIterator &pkg,
1644                               const pkgCache::VerIterator &ver,
1645                               bool const &follow_recommends,
1646                               bool const &follow_suggests)
1647 {
1648    pkgDepCache::StateCache &state = PkgState[pkg->ID];
1649
1650    // if we are marked already we are done
1651    if(state.Marked)
1652       return;
1653
1654    VerIterator const currver = pkg.CurrentVer();
1655    VerIterator const instver = state.InstVerIter(*this);
1656
1657 #if 0
1658    VerIterator const candver = state.CandidateVerIter(*this);
1659
1660    // If a package was garbage-collected but is now being marked, we
1661    // should re-select it
1662    // For cases when a pkg is set to upgrade and this trigger the
1663    // removal of a no-longer used dependency.  if the pkg is set to
1664    // keep again later it will result in broken deps
1665    if(state.Delete() && state.RemoveReason = Unused)
1666    {
1667       if(ver==candver)
1668          mark_install(pkg, false, false, NULL);
1669       else if(ver==pkg.CurrentVer())
1670          MarkKeep(pkg, false, false);
1671
1672       instver=state.InstVerIter(*this);
1673    }
1674 #endif
1675
1676    // For packages that are not going to be removed, ignore versions
1677    // other than the InstVer.  For packages that are going to be
1678    // removed, ignore versions other than the current version.
1679    if(!(ver == instver && !instver.end()) &&
1680       !(ver == currver && instver.end() && !ver.end()))
1681       return;
1682
1683    bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
1684
1685    if(debug_autoremove)
1686      {
1687        std::clog << "Marking: " << pkg.FullName();
1688        if(!ver.end())
1689          std::clog << " " << ver.VerStr();
1690        if(!currver.end())
1691          std::clog << ", Curr=" << currver.VerStr();
1692        if(!instver.end())
1693          std::clog << ", Inst=" << instver.VerStr();
1694        std::clog << std::endl;
1695      }
1696
1697    state.Marked=true;
1698
1699    if(ver.end() == true)
1700       return;
1701
1702      for(DepIterator d = ver.DependsList(); !d.end(); ++d)
1703      {
1704         if(d->Type == Dep::Depends ||
1705            d->Type == Dep::PreDepends ||
1706            (follow_recommends &&
1707             d->Type == Dep::Recommends) ||
1708            (follow_suggests &&
1709             d->Type == Dep::Suggests))
1710         {
1711            // Try all versions of this package.
1712            for(VerIterator V = d.TargetPkg().VersionList();
1713                !V.end(); ++V)
1714            {
1715               if(_system->VS->CheckDep(V.VerStr(), d->CompareOp, d.TargetVer()))
1716               {
1717                 if(debug_autoremove)
1718                   {
1719                     std::clog << "Following dep: " << d.ParentPkg().FullName()
1720                               << " " << d.ParentVer().VerStr() << " "
1721                               << d.DepType() << " " << d.TargetPkg().FullName();
1722                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1723                       {
1724                         std::clog << " (" << d.CompType() << " "
1725                                   << d.TargetVer() << ")";
1726                       }
1727                     std::clog << std::endl;
1728                   }
1729                  MarkPackage(V.ParentPkg(), V,
1730                              follow_recommends, follow_suggests);
1731               }
1732            }
1733            // Now try virtual packages
1734            for(PrvIterator prv=d.TargetPkg().ProvidesList();
1735                !prv.end(); ++prv)
1736            {
1737               if(_system->VS->CheckDep(prv.ProvideVersion(), d->CompareOp,
1738                                        d.TargetVer()))
1739               {
1740                 if(debug_autoremove)
1741                   {
1742                     std::clog << "Following dep: " << d.ParentPkg().FullName() << " "
1743                               << d.ParentVer().VerStr() << " "
1744                               << d.DepType() << " " << d.TargetPkg().FullName() << " ";
1745                     if((d->CompareOp & ~pkgCache::Dep::Or) != pkgCache::Dep::NoOp)
1746                       {
1747                         std::clog << " (" << d.CompType() << " "
1748                                   << d.TargetVer() << ")";
1749                       }
1750                     std::clog << ", provided by "
1751                               << prv.OwnerPkg().FullName() << " "
1752                               << prv.OwnerVer().VerStr()
1753                               << std::endl;
1754                   }
1755
1756                  MarkPackage(prv.OwnerPkg(), prv.OwnerVer(),
1757                              follow_recommends, follow_suggests);
1758               }
1759            }
1760         }
1761      }
1762 }
1763                                                                         /*}}}*/
1764 bool pkgDepCache::Sweep()                                               /*{{{*/
1765 {
1766    bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
1767
1768    // do the sweep
1769    for(PkgIterator p=PkgBegin(); !p.end(); ++p)
1770    {
1771      StateCache &state=PkgState[p->ID];
1772
1773      // skip required packages
1774      if (!p.CurrentVer().end() &&
1775          (p.CurrentVer()->Priority == pkgCache::State::Required))
1776         continue;
1777
1778      // if it is not marked and it is installed, it's garbage
1779      if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
1780      {
1781         state.Garbage=true;
1782         if(debug_autoremove)
1783            std::clog << "Garbage: " << p.FullName() << std::endl;
1784      }
1785   }
1786
1787    return true;
1788 }
1789                                                                         /*}}}*/