apt-pkg/depcache.cc

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