apt-pkg/packagemanager.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: packagemanager.cc,v 1.30 2003/04/27 03:04:15 doogie Exp $
   4 /* ######################################################################
   5
   6    Package Manager - Abstacts the package manager
   7
   8    More work is needed in the area of transitioning provides, ie exim
   9    replacing smail. This can cause interesing side effects.
  10
  11    Other cases involving conflicts+replaces should be tested.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #include<config.h>
  17
  18 #include <apt-pkg/packagemanager.h>
  19 #include <apt-pkg/orderlist.h>
  20 #include <apt-pkg/depcache.h>
  21 #include <apt-pkg/error.h>
  22 #include <apt-pkg/version.h>
  23 #include <apt-pkg/acquire-item.h>
  24 #include <apt-pkg/algorithms.h>
  25 #include <apt-pkg/configuration.h>
  26 #include <apt-pkg/sptr.h>
  27
  28 #include <iostream>
  29 #include <fcntl.h>
  30
  31 #include <apti18n.h>
  32                                                                         /*}}}*/
  33 using namespace std;
  34
  35 bool pkgPackageManager::SigINTStop = false;
  36
  37 // PM::PackageManager - Constructor                                     /*{{{*/
  38 // ---------------------------------------------------------------------
  39 /* */
  40 pkgPackageManager::pkgPackageManager(pkgDepCache *pCache) : Cache(*pCache),
  41                                                             List(NULL), Res(Incomplete)
  42 {
  43    FileNames = new string[Cache.Head().PackageCount];
  44    Debug = _config->FindB("Debug::pkgPackageManager",false);
  45    NoImmConfigure = !_config->FindB("APT::Immediate-Configure",true);
  46    ImmConfigureAll = _config->FindB("APT::Immediate-Configure-All",false);
  47 }
  48                                                                         /*}}}*/
  49 // PM::PackageManager - Destructor                                      /*{{{*/
  50 // ---------------------------------------------------------------------
  51 /* */
  52 pkgPackageManager::~pkgPackageManager()
  53 {
  54    delete List;
  55    delete [] FileNames;
  56 }
  57                                                                         /*}}}*/
  58 // PM::GetArchives - Queue the archives for download                    /*{{{*/
  59 // ---------------------------------------------------------------------
  60 /* */
  61 bool pkgPackageManager::GetArchives(pkgAcquire *Owner,pkgSourceList *Sources,
  62                                     pkgRecords *Recs)
  63 {
  64    if (CreateOrderList() == false)
  65       return false;
  66
  67    bool const ordering =
  68         _config->FindB("PackageManager::UnpackAll",true) ?
  69                 List->OrderUnpack() : List->OrderCritical();
  70    if (ordering == false)
  71       return _error->Error("Internal ordering error");
  72
  73    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
  74    {
  75       PkgIterator Pkg(Cache,*I);
  76       FileNames[Pkg->ID] = string();
  77
  78       // Skip packages to erase
  79       if (Cache[Pkg].Delete() == true)
  80          continue;
  81
  82       // Skip Packages that need configure only.
  83       if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
  84           Cache[Pkg].Keep() == true)
  85          continue;
  86
  87       // Skip already processed packages
  88       if (List->IsNow(Pkg) == false)
  89          continue;
  90
  91       new pkgAcqArchive(Owner,Sources,Recs,Cache[Pkg].InstVerIter(Cache),
  92                         FileNames[Pkg->ID]);
  93    }
  94
  95    return true;
  96 }
  97                                                                         /*}}}*/
  98 // PM::FixMissing - Keep all missing packages                           /*{{{*/
  99 // ---------------------------------------------------------------------
 100 /* This is called to correct the installation when packages could not
 101    be downloaded. */
 102 bool pkgPackageManager::FixMissing()
 103 {
 104    pkgDepCache::ActionGroup group(Cache);
 105    pkgProblemResolver Resolve(&Cache);
 106    List->SetFileList(FileNames);
 107
 108    bool Bad = false;
 109    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
 110    {
 111       if (List->IsMissing(I) == false)
 112          continue;
 113
 114       // Okay, this file is missing and we need it. Mark it for keep
 115       Bad = true;
 116       Cache.MarkKeep(I, false, false);
 117    }
 118
 119    // We have to empty the list otherwise it will not have the new changes
 120    delete List;
 121    List = 0;
 122
 123    if (Bad == false)
 124       return true;
 125
 126    // Now downgrade everything that is broken
 127    return Resolve.ResolveByKeep() == true && Cache.BrokenCount() == 0;
 128 }
 129                                                                         /*}}}*/
 130 // PM::ImmediateAdd - Add the immediate flag recursivly                 /*{{{*/
 131 // ---------------------------------------------------------------------
 132 /* This adds the immediate flag to the pkg and recursively to the
 133    dependendies
 134  */
 135 void pkgPackageManager::ImmediateAdd(PkgIterator I, bool UseInstallVer, unsigned const int &Depth)
 136 {
 137    DepIterator D;
 138
 139    if(UseInstallVer)
 140    {
 141       if(Cache[I].InstallVer == 0)
 142          return;
 143       D = Cache[I].InstVerIter(Cache).DependsList();
 144    } else {
 145       if (I->CurrentVer == 0)
 146          return;
 147       D = I.CurrentVer().DependsList();
 148    }
 149
 150    for ( /* nothing */  ; D.end() == false; ++D)
 151       if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 152       {
 153          if(!List->IsFlag(D.TargetPkg(), pkgOrderList::Immediate))
 154          {
 155             if(Debug)
 156                clog << OutputInDepth(Depth) << "ImmediateAdd(): Adding Immediate flag to " << D.TargetPkg() << " cause of " << D.DepType() << " " << I.FullName() << endl;
 157             List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
 158             ImmediateAdd(D.TargetPkg(), UseInstallVer, Depth + 1);
 159          }
 160       }
 161    return;
 162 }
 163                                                                         /*}}}*/
 164 // PM::CreateOrderList - Create the ordering class                      /*{{{*/
 165 // ---------------------------------------------------------------------
 166 /* This populates the ordering list with all the packages that are
 167    going to change. */
 168 bool pkgPackageManager::CreateOrderList()
 169 {
 170    if (List != 0)
 171       return true;
 172
 173    delete List;
 174    List = new pkgOrderList(&Cache);
 175
 176    if (Debug && ImmConfigureAll)
 177       clog << "CreateOrderList(): Adding Immediate flag for all packages because of APT::Immediate-Configure-All" << endl;
 178
 179    // Generate the list of affected packages and sort it
 180    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
 181    {
 182       // Ignore no-version packages
 183       if (I->VersionList == 0)
 184          continue;
 185
 186       // Mark the package and its dependends for immediate configuration
 187       if ((((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential) &&
 188           NoImmConfigure == false) || ImmConfigureAll)
 189       {
 190          if(Debug && !ImmConfigureAll)
 191             clog << "CreateOrderList(): Adding Immediate flag for " << I.FullName() << endl;
 192          List->Flag(I,pkgOrderList::Immediate);
 193
 194          if (!ImmConfigureAll) {
 195             // Look for other install packages to make immediate configurea
 196             ImmediateAdd(I, true);
 197
 198             // And again with the current version.
 199             ImmediateAdd(I, false);
 200          }
 201       }
 202
 203       // Not interesting
 204       if ((Cache[I].Keep() == true ||
 205           Cache[I].InstVerIter(Cache) == I.CurrentVer()) &&
 206           I.State() == pkgCache::PkgIterator::NeedsNothing &&
 207           (Cache[I].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall &&
 208           (I.Purge() != false || Cache[I].Mode != pkgDepCache::ModeDelete ||
 209            (Cache[I].iFlags & pkgDepCache::Purge) != pkgDepCache::Purge))
 210          continue;
 211
 212       // Append it to the list
 213       List->push_back(I);
 214    }
 215
 216    return true;
 217 }
 218                                                                         /*}}}*/
 219 // PM::DepAlwaysTrue - Returns true if this dep is irrelevent           /*{{{*/
 220 // ---------------------------------------------------------------------
 221 /* The restriction on provides is to eliminate the case when provides
 222    are transitioning between valid states [ie exim to smail] */
 223 bool pkgPackageManager::DepAlwaysTrue(DepIterator D)
 224 {
 225    if (D.TargetPkg()->ProvidesList != 0)
 226       return false;
 227
 228    if ((Cache[D] & pkgDepCache::DepInstall) != 0 &&
 229        (Cache[D] & pkgDepCache::DepNow) != 0)
 230       return true;
 231    return false;
 232 }
 233                                                                         /*}}}*/
 234 // PM::CheckRConflicts - Look for reverse conflicts                     /*{{{*/
 235 // ---------------------------------------------------------------------
 236 /* This looks over the reverses for a conflicts line that needs early
 237    removal. */
 238 bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
 239                                         const char *Ver)
 240 {
 241    for (;D.end() == false; ++D)
 242    {
 243       if (D->Type != pkgCache::Dep::Conflicts &&
 244           D->Type != pkgCache::Dep::Obsoletes)
 245          continue;
 246
 247       // The package hasnt been changed
 248       if (List->IsNow(Pkg) == false)
 249          continue;
 250
 251       // Ignore self conflicts, ignore conflicts from irrelevent versions
 252       if (D.IsIgnorable(Pkg) || D.ParentVer() != D.ParentPkg().CurrentVer())
 253          continue;
 254
 255       if (Cache.VS().CheckDep(Ver,D->CompareOp,D.TargetVer()) == false)
 256          continue;
 257
 258       if (EarlyRemove(D.ParentPkg()) == false)
 259          return _error->Error("Reverse conflicts early remove for package '%s' failed",
 260                               Pkg.FullName().c_str());
 261    }
 262    return true;
 263 }
 264                                                                         /*}}}*/
 265 // PM::ConfigureAll - Run the all out configuration                     /*{{{*/
 266 // ---------------------------------------------------------------------
 267 /* This configures every package. It is assumed they are all unpacked and
 268    that the final configuration is valid. This is also used to catch packages
 269    that have not been configured when using ImmConfigureAll */
 270 bool pkgPackageManager::ConfigureAll()
 271 {
 272    pkgOrderList OList(&Cache);
 273
 274    // Populate the order list
 275    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
 276       if (List->IsFlag(pkgCache::PkgIterator(Cache,*I),
 277                        pkgOrderList::UnPacked) == true)
 278          OList.push_back(*I);
 279
 280    if (OList.OrderConfigure() == false)
 281       return false;
 282
 283    std::string const conf = _config->Find("PackageManager::Configure","all");
 284    bool const ConfigurePkgs = (conf == "all");
 285
 286    // Perform the configuring
 287    for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); ++I)
 288    {
 289       PkgIterator Pkg(Cache,*I);
 290
 291       /* Check if the package has been configured, this can happen if SmartConfigure
 292          calls its self */
 293       if (List->IsFlag(Pkg,pkgOrderList::Configured)) continue;
 294
 295       if (ConfigurePkgs == true && SmartConfigure(Pkg, 0) == false) {
 296          if (ImmConfigureAll)
 297             _error->Error(_("Could not perform immediate configuration on '%s'. "
 298                         "Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.FullName().c_str(),1);
 299          else
 300             _error->Error("Internal error, packages left unconfigured. %s",Pkg.FullName().c_str());
 301          return false;
 302       }
 303
 304       List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 305    }
 306
 307    return true;
 308 }
 309                                                                         /*}}}*/
 310 // PM::SmartConfigure - Perform immediate configuration of the pkg      /*{{{*/
 311 // ---------------------------------------------------------------------
 312 /* This function tries to put the system in a state where Pkg can be configured.
 313    This involves checking each of Pkg's dependanies and unpacking and
 314    configuring packages where needed.
 315
 316    Note on failure: This method can fail, without causing any problems.
 317    This can happen when using Immediate-Configure-All, SmartUnPack may call
 318    SmartConfigure, it may fail because of a complex dependancy situation, but
 319    a error will only be reported if ConfigureAll fails. This is why some of the
 320    messages this function reports on failure (return false;) as just warnings
 321    only shown when debuging*/
 322 bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
 323 {
 324    // If this is true, only check and correct and dependencies without the Loop flag
 325    bool const PkgLoop = List->IsFlag(Pkg,pkgOrderList::Loop);
 326
 327    if (Debug) {
 328       VerIterator InstallVer = VerIterator(Cache,Cache[Pkg].InstallVer);
 329       clog << OutputInDepth(Depth) << "SmartConfigure " << Pkg.FullName() << " (" << InstallVer.VerStr() << ")";
 330       if (PkgLoop)
 331         clog << " (Only Correct Dependencies)";
 332       clog << endl;
 333    }
 334
 335    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
 336
 337    /* Because of the ordered list, most dependencies should be unpacked,
 338       however if there is a loop (A depends on B, B depends on A) this will not
 339       be the case, so check for dependencies before configuring. */
 340    bool Bad = false, Changed = false;
 341    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 500);
 342    unsigned int i=0;
 343    do
 344    {
 345       Changed = false;
 346       for (DepIterator D = instVer.DependsList(); D.end() == false; )
 347       {
 348          // Compute a single dependency element (glob or)
 349          pkgCache::DepIterator Start, End;
 350          D.GlobOr(Start,End);
 351
 352          if (End->Type != pkgCache::Dep::Depends)
 353             continue;
 354          Bad = true;
 355
 356          // Search for dependencies which are unpacked but aren't configured yet (maybe loops)
 357          for (DepIterator Cur = Start; true; ++Cur)
 358          {
 359             SPtrArray<Version *> VList = Cur.AllTargets();
 360
 361             for (Version **I = VList; *I != 0; ++I)
 362             {
 363                VerIterator Ver(Cache,*I);
 364                PkgIterator DepPkg = Ver.ParentPkg();
 365
 366                // Check if the current version of the package is available and will satisfy this dependency
 367                if (DepPkg.CurrentVer() == Ver && List->IsNow(DepPkg) == true &&
 368                    List->IsFlag(DepPkg,pkgOrderList::Removed) == false &&
 369                    DepPkg.State() == PkgIterator::NeedsNothing)
 370                {
 371                   Bad = false;
 372                   break;
 373                }
 374
 375                // Check if the version that is going to be installed will satisfy the dependency
 376                if (Cache[DepPkg].InstallVer != *I)
 377                   continue;
 378
 379                if (List->IsFlag(DepPkg,pkgOrderList::UnPacked))
 380                {
 381                   if (List->IsFlag(DepPkg,pkgOrderList::Loop) && PkgLoop)
 382                   {
 383                     // This dependency has already been dealt with by another SmartConfigure on Pkg
 384                     Bad = false;
 385                     break;
 386                   }
 387                   /* Check for a loop to prevent one forming
 388                        If A depends on B and B depends on A, SmartConfigure will
 389                        just hop between them if this is not checked. Dont remove the
 390                        loop flag after finishing however as loop is already set.
 391                        This means that there is another SmartConfigure call for this
 392                        package and it will remove the loop flag */
 393                   if (PkgLoop == false)
 394                      List->Flag(Pkg,pkgOrderList::Loop);
 395                   if (SmartConfigure(DepPkg, Depth + 1) == true)
 396                   {
 397                      Bad = false;
 398                      if (List->IsFlag(DepPkg,pkgOrderList::Loop) == false)
 399                         Changed = true;
 400                   }
 401                   if (PkgLoop == false)
 402                     List->RmFlag(Pkg,pkgOrderList::Loop);
 403                   // If SmartConfigure was succesfull, Bad is false, so break
 404                   if (Bad == false)
 405                      break;
 406                }
 407                else if (List->IsFlag(DepPkg,pkgOrderList::Configured))
 408                {
 409                   Bad = false;
 410                   break;
 411                }
 412             }
 413             if (Cur == End)
 414                break;
 415          }
 416
 417          if (Bad == false)
 418             continue;
 419
 420          // Check for dependencies that have not been unpacked, probably due to loops.
 421          for (DepIterator Cur = Start; true; ++Cur)
 422          {
 423             SPtrArray<Version *> VList = Cur.AllTargets();
 424
 425             for (Version **I = VList; *I != 0; ++I)
 426             {
 427                VerIterator Ver(Cache,*I);
 428                PkgIterator DepPkg = Ver.ParentPkg();
 429
 430                // Check if the version that is going to be installed will satisfy the dependency
 431                if (Cache[DepPkg].InstallVer != *I || List->IsNow(DepPkg) == false)
 432                   continue;
 433
 434                if (PkgLoop == true)
 435                {
 436                   if (Debug)
 437                      std::clog << OutputInDepth(Depth) << "Package " << Pkg << " loops in SmartConfigure" << std::endl;
 438                   Bad = false;
 439                   break;
 440                }
 441                else
 442                {
 443                   if (Debug)
 444                      clog << OutputInDepth(Depth) << "Unpacking " << DepPkg.FullName() << " to avoid loop " << Cur << endl;
 445                   if (PkgLoop == false)
 446                      List->Flag(Pkg,pkgOrderList::Loop);
 447                   if (SmartUnPack(DepPkg, true, Depth + 1) == true)
 448                   {
 449                      Bad = false;
 450                      if (List->IsFlag(DepPkg,pkgOrderList::Loop) == false)
 451                         Changed = true;
 452                   }
 453                   if (PkgLoop == false)
 454                      List->RmFlag(Pkg,pkgOrderList::Loop);
 455                   if (Bad == false)
 456                      break;
 457                }
 458             }
 459
 460             if (Cur == End)
 461                break;
 462          }
 463
 464          if (Bad == true && Changed == false && Debug == true)
 465             std::clog << OutputInDepth(Depth) << "Could not satisfy " << Start << std::endl;
 466       }
 467       if (i++ > max_loops)
 468          return _error->Error("Internal error: MaxLoopCount reached in SmartUnPack for %s, aborting", Pkg.FullName().c_str());
 469    } while (Changed == true);
 470
 471    if (Bad) {
 472       if (Debug)
 473          _error->Warning(_("Could not configure '%s'. "),Pkg.FullName().c_str());
 474       return false;
 475    }
 476
 477    if (PkgLoop) return true;
 478
 479    static std::string const conf = _config->Find("PackageManager::Configure","all");
 480    static bool const ConfigurePkgs = (conf == "all" || conf == "smart");
 481
 482    if (List->IsFlag(Pkg,pkgOrderList::Configured))
 483       return _error->Error("Internal configure error on '%s'.", Pkg.FullName().c_str());
 484
 485    if (ConfigurePkgs == true && Configure(Pkg) == false)
 486       return false;
 487
 488    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 489
 490    if ((Cache[Pkg].InstVerIter(Cache)->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 491       for (PkgIterator P = Pkg.Group().PackageList();
 492            P.end() == false; P = Pkg.Group().NextPkg(P))
 493       {
 494          if (Pkg == P || List->IsFlag(P,pkgOrderList::Configured) == true ||
 495              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 496               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 497             continue;
 498          SmartConfigure(P, (Depth +1));
 499       }
 500
 501    // Sanity Check
 502    if (List->IsFlag(Pkg,pkgOrderList::Configured) == false)
 503       return _error->Error(_("Could not configure '%s'. "),Pkg.FullName().c_str());
 504
 505    return true;
 506 }
 507                                                                         /*}}}*/
 508 // PM::EarlyRemove - Perform removal of packages before their time      /*{{{*/
 509 // ---------------------------------------------------------------------
 510 /* This is called to deal with conflicts arising from unpacking */
 511 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
 512 {
 513    if (List->IsNow(Pkg) == false)
 514       return true;
 515
 516    // Already removed it
 517    if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
 518       return true;
 519
 520    // Woops, it will not be re-installed!
 521    if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
 522       return false;
 523
 524    // Essential packages get special treatment
 525    bool IsEssential = false;
 526    if ((Pkg->Flags & pkgCache::Flag::Essential) != 0 ||
 527        (Pkg->Flags & pkgCache::Flag::Important) != 0)
 528       IsEssential = true;
 529
 530    /* Check for packages that are the dependents of essential packages and
 531       promote them too */
 532    if (Pkg->CurrentVer != 0)
 533    {
 534       for (DepIterator D = Pkg.RevDependsList(); D.end() == false &&
 535            IsEssential == false; ++D)
 536          if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 537             if ((D.ParentPkg()->Flags & pkgCache::Flag::Essential) != 0 ||
 538                 (D.ParentPkg()->Flags & pkgCache::Flag::Important) != 0)
 539                IsEssential = true;
 540    }
 541
 542    if (IsEssential == true)
 543    {
 544       if (_config->FindB("APT::Force-LoopBreak",false) == false)
 545          return _error->Error(_("This installation run will require temporarily "
 546                                 "removing the essential package %s due to a "
 547                                 "Conflicts/Pre-Depends loop. This is often bad, "
 548                                 "but if you really want to do it, activate the "
 549                                 "APT::Force-LoopBreak option."),Pkg.FullName().c_str());
 550    }
 551
 552    bool Res = SmartRemove(Pkg);
 553    if (Cache[Pkg].Delete() == false)
 554       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
 555
 556    return Res;
 557 }
 558                                                                         /*}}}*/
 559 // PM::SmartRemove - Removal Helper                                     /*{{{*/
 560 // ---------------------------------------------------------------------
 561 /* */
 562 bool pkgPackageManager::SmartRemove(PkgIterator Pkg)
 563 {
 564    if (List->IsNow(Pkg) == false)
 565       return true;
 566
 567    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 568
 569    return Remove(Pkg,(Cache[Pkg].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge);
 570 }
 571                                                                         /*}}}*/
 572 // PM::SmartUnPack - Install helper                                     /*{{{*/
 573 // ---------------------------------------------------------------------
 574 /* This puts the system in a state where it can Unpack Pkg, if Pkg is allready
 575    unpacked, or when it has been unpacked, if Immediate==true it configures it. */
 576 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
 577 {
 578    return SmartUnPack(Pkg, true, 0);
 579 }
 580 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int const Depth)
 581 {
 582    bool PkgLoop = List->IsFlag(Pkg,pkgOrderList::Loop);
 583
 584    if (Debug) {
 585       clog << OutputInDepth(Depth) << "SmartUnPack " << Pkg.FullName();
 586       VerIterator InstallVer = VerIterator(Cache,Cache[Pkg].InstallVer);
 587       if (Pkg.CurrentVer() == 0)
 588         clog << " (install version " << InstallVer.VerStr() << ")";
 589       else
 590         clog << " (replace version " << Pkg.CurrentVer().VerStr() << " with " << InstallVer.VerStr() << ")";
 591       if (PkgLoop)
 592         clog << " (Only Perform PreUnpack Checks)";
 593       clog << endl;
 594    }
 595
 596    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
 597
 598    /* PreUnpack Checks: This loop checks and attempts to rectify and problems that would prevent the package being unpacked.
 599       It addresses: PreDepends, Conflicts, Obsoletes and Breaks (DpkgBreaks). Any resolutions that do not require it should
 600       avoid configuration (calling SmartUnpack with Immediate=true), this is because when unpacking some packages with
 601       complex dependancy structures, trying to configure some packages while breaking the loops can complicate things .
 602       This will be either dealt with if the package is configured as a dependency of Pkg (if and when Pkg is configured),
 603       or by the ConfigureAll call at the end of the for loop in OrderInstall. */
 604    bool Changed = false;
 605    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 500);
 606    unsigned int i = 0;
 607    do
 608    {
 609       Changed = false;
 610       for (DepIterator D = instVer.DependsList(); D.end() == false; )
 611       {
 612          // Compute a single dependency element (glob or)
 613          pkgCache::DepIterator Start, End;
 614          D.GlobOr(Start,End);
 615
 616          if (End->Type == pkgCache::Dep::PreDepends)
 617          {
 618             bool Bad = true;
 619             if (Debug)
 620                clog << OutputInDepth(Depth) << "PreDepends order for " << Pkg.FullName() << std::endl;
 621
 622             // Look for easy targets: packages that are already okay
 623             for (DepIterator Cur = Start; Bad == true; ++Cur)
 624             {
 625                SPtrArray<Version *> VList = Cur.AllTargets();
 626                for (Version **I = VList; *I != 0; ++I)
 627                {
 628                   VerIterator Ver(Cache,*I);
 629                   PkgIterator Pkg = Ver.ParentPkg();
 630
 631                   // See if the current version is ok
 632                   if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 633                       Pkg.State() == PkgIterator::NeedsNothing)
 634                   {
 635                      Bad = false;
 636                      if (Debug)
 637                         clog << OutputInDepth(Depth) << "Found ok package " << Pkg.FullName() << endl;
 638                      break;
 639                   }
 640                }
 641                if (Cur == End)
 642                   break;
 643             }
 644
 645             // Look for something that could be configured.
 646             for (DepIterator Cur = Start; Bad == true && Cur.end() == false; ++Cur)
 647             {
 648                SPtrArray<Version *> VList = Cur.AllTargets();
 649                for (Version **I = VList; *I != 0; ++I)
 650                {
 651                   VerIterator Ver(Cache,*I);
 652                   PkgIterator Pkg = Ver.ParentPkg();
 653
 654                   // Not the install version
 655                   if (Cache[Pkg].InstallVer != *I ||
 656                       (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 657                      continue;
 658
 659                   if (List->IsFlag(Pkg,pkgOrderList::Configured))
 660                   {
 661                      Bad = false;
 662                      break;
 663                   }
 664
 665                   // check if it needs unpack or if if configure is enough
 666                   if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == false)
 667                   {
 668                      if (Debug)
 669                         clog << OutputInDepth(Depth) << "Trying to SmartUnpack " << Pkg.FullName() << endl;
 670                      // SmartUnpack with the ImmediateFlag to ensure its really ready
 671                      if (SmartUnPack(Pkg, true, Depth + 1) == true)
 672                      {
 673                         Bad = false;
 674                         if (List->IsFlag(Pkg,pkgOrderList::Loop) == false)
 675                            Changed = true;
 676                         break;
 677                      }
 678                   }
 679                   else
 680                   {
 681                      if (Debug)
 682                         clog << OutputInDepth(Depth) << "Trying to SmartConfigure " << Pkg.FullName() << endl;
 683                      if (SmartConfigure(Pkg, Depth + 1) == true)
 684                      {
 685                         Bad = false;
 686                         if (List->IsFlag(Pkg,pkgOrderList::Loop) == false)
 687                            Changed = true;
 688                         break;
 689                      }
 690                   }
 691                }
 692             }
 693
 694             if (Bad == true)
 695             {
 696                if (Start == End)
 697                   return _error->Error("Couldn't configure pre-depend %s for %s, "
 698                                         "probably a dependency cycle.",
 699                                         End.TargetPkg().FullName().c_str(),Pkg.FullName().c_str());
 700             }
 701             else
 702                continue;
 703          }
 704          else if (End->Type == pkgCache::Dep::Conflicts ||
 705                   End->Type == pkgCache::Dep::Obsoletes)
 706          {
 707             /* Look for conflicts. Two packages that are both in the install
 708                state cannot conflict so we don't check.. */
 709             SPtrArray<Version *> VList = End.AllTargets();
 710             for (Version **I = VList; *I != 0; I++)
 711             {
 712                VerIterator Ver(Cache,*I);
 713                PkgIterator ConflictPkg = Ver.ParentPkg();
 714                VerIterator InstallVer(Cache,Cache[ConflictPkg].InstallVer);
 715
 716                // See if the current version is conflicting
 717                if (ConflictPkg.CurrentVer() == Ver && List->IsNow(ConflictPkg))
 718                {
 719                   clog << OutputInDepth(Depth) << Pkg.FullName() << " conflicts with " << ConflictPkg.FullName() << endl;
 720                   /* If a loop is not present or has not yet been detected, attempt to unpack packages
 721                      to resolve this conflict. If there is a loop present, remove packages to resolve this conflict */
 722                   if (List->IsFlag(ConflictPkg,pkgOrderList::Loop) == false)
 723                   {
 724                      if (Cache[ConflictPkg].Keep() == 0 && Cache[ConflictPkg].InstallVer != 0)
 725                      {
 726                         if (Debug)
 727                            clog << OutputInDepth(Depth) << OutputInDepth(Depth) << "Unpacking " << ConflictPkg.FullName() << " to prevent conflict" << endl;
 728                         List->Flag(Pkg,pkgOrderList::Loop);
 729                         if (SmartUnPack(ConflictPkg,false, Depth + 1) == true)
 730                            if (List->IsFlag(ConflictPkg,pkgOrderList::Loop) == false)
 731                               Changed = true;
 732                         // Remove loop to allow it to be used later if needed
 733                         List->RmFlag(Pkg,pkgOrderList::Loop);
 734                      }
 735                      else if (EarlyRemove(ConflictPkg) == false)
 736                         return _error->Error("Internal Error, Could not early remove %s (1)",ConflictPkg.FullName().c_str());
 737                   }
 738                   else if (List->IsFlag(ConflictPkg,pkgOrderList::Removed) == false)
 739                   {
 740                      if (Debug)
 741                         clog << OutputInDepth(Depth) << "Because of conficts knot, removing " << ConflictPkg.FullName() << " to conflict violation" << endl;
 742                      if (EarlyRemove(ConflictPkg) == false)
 743                         return _error->Error("Internal Error, Could not early remove %s (2)",ConflictPkg.FullName().c_str());
 744                   }
 745                }
 746             }
 747          }
 748          else if (End->Type == pkgCache::Dep::DpkgBreaks)
 749          {
 750             SPtrArray<Version *> VList = End.AllTargets();
 751             for (Version **I = VList; *I != 0; ++I)
 752             {
 753                VerIterator Ver(Cache,*I);
 754                PkgIterator BrokenPkg = Ver.ParentPkg();
 755                if (BrokenPkg.CurrentVer() != Ver)
 756                {
 757                   if (Debug)
 758                      std::clog << OutputInDepth(Depth) << "  Ignore not-installed version " << Ver.VerStr() << " of " << Pkg.FullName() << " for " << End << std::endl;
 759                   continue;
 760                }
 761
 762                // Check if it needs to be unpacked
 763                if (List->IsFlag(BrokenPkg,pkgOrderList::InList) && Cache[BrokenPkg].Delete() == false &&
 764                    List->IsNow(BrokenPkg))
 765                {
 766                   if (List->IsFlag(BrokenPkg,pkgOrderList::Loop) && PkgLoop)
 767                   {
 768                      // This dependancy has already been dealt with by another SmartUnPack on Pkg
 769                      break;
 770                   }
 771                   else
 772                   {
 773                      // Found a break, so see if we can unpack the package to avoid it
 774                      // but do not set loop if another SmartUnPack already deals with it
 775                      // Also, avoid it if the package we would unpack pre-depends on this one
 776                      VerIterator InstallVer(Cache,Cache[BrokenPkg].InstallVer);
 777                      bool circle = false;
 778                      for (pkgCache::DepIterator D = InstallVer.DependsList(); D.end() == false; ++D)
 779                      {
 780                         if (D->Type != pkgCache::Dep::PreDepends)
 781                            continue;
 782                         SPtrArray<Version *> VL = D.AllTargets();
 783                         for (Version **I = VL; *I != 0; ++I)
 784                         {
 785                            VerIterator V(Cache,*I);
 786                            PkgIterator P = V.ParentPkg();
 787                            // we are checking for installation as an easy 'protection' against or-groups and (unchosen) providers
 788                            if (P != Pkg || (P.CurrentVer() != V && Cache[P].InstallVer != V))
 789                               continue;
 790                            circle = true;
 791                            break;
 792                         }
 793                         if (circle == true)
 794                            break;
 795                      }
 796                      if (circle == true)
 797                      {
 798                         if (Debug)
 799                            clog << OutputInDepth(Depth) << "  Avoiding " << End << " avoided as " << BrokenPkg.FullName() << " has a pre-depends on " << Pkg.FullName() << std::endl;
 800                         continue;
 801                      }
 802                      else
 803                      {
 804                         if (Debug)
 805                         {
 806                            clog << OutputInDepth(Depth) << "  Unpacking " << BrokenPkg.FullName() << " to avoid " << End;
 807                            if (PkgLoop == true)
 808                               clog << " (Looping)";
 809                            clog << std::endl;
 810                         }
 811                         if (PkgLoop == false)
 812                            List->Flag(Pkg,pkgOrderList::Loop);
 813                         if (SmartUnPack(BrokenPkg, false, Depth + 1) == true)
 814                         {
 815                            if (List->IsFlag(BrokenPkg,pkgOrderList::Loop) == false)
 816                               Changed = true;
 817                         }
 818                         if (PkgLoop == false)
 819                            List->RmFlag(Pkg,pkgOrderList::Loop);
 820                      }
 821                   }
 822                }
 823                // Check if a package needs to be removed
 824                else if (Cache[BrokenPkg].Delete() == true && List->IsFlag(BrokenPkg,pkgOrderList::Configured) == false)
 825                {
 826                   if (Debug)
 827                      clog << OutputInDepth(Depth) << "  Removing " << BrokenPkg.FullName() << " to avoid " << End << endl;
 828                   SmartRemove(BrokenPkg);
 829                }
 830             }
 831          }
 832       }
 833       if (i++ > max_loops)
 834          return _error->Error("Internal error: APT::pkgPackageManager::MaxLoopCount reached in SmartConfigure for %s, aborting", Pkg.FullName().c_str());
 835    } while (Changed == true);
 836
 837    // Check for reverse conflicts.
 838    if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
 839                    instVer.VerStr()) == false)
 840                           return false;
 841
 842    for (PrvIterator P = instVer.ProvidesList();
 843         P.end() == false; ++P)
 844       if (Pkg->Group != P.OwnerPkg()->Group)
 845          CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());
 846
 847    if (PkgLoop)
 848       return true;
 849
 850    List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 851
 852    if (Immediate == true && (instVer->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 853    {
 854       /* Do lockstep M-A:same unpacking in two phases:
 855          First unpack all installed architectures, then the not installed.
 856          This way we avoid that M-A: enabled packages are installed before
 857          their older non-M-A enabled packages are replaced by newer versions */
 858       bool const installed = Pkg->CurrentVer != 0;
 859       if (installed == true &&
 860           (instVer != Pkg.CurrentVer() ||
 861            ((Cache[Pkg].iFlags & pkgDepCache::ReInstall) == pkgDepCache::ReInstall)) &&
 862           Install(Pkg,FileNames[Pkg->ID]) == false)
 863          return false;
 864       for (PkgIterator P = Pkg.Group().PackageList();
 865            P.end() == false; P = Pkg.Group().NextPkg(P))
 866       {
 867          if (P->CurrentVer == 0 || P == Pkg || List->IsFlag(P,pkgOrderList::UnPacked) == true ||
 868              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 869               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 870             continue;
 871          if (SmartUnPack(P, false, Depth + 1) == false)
 872             return false;
 873       }
 874       if (installed == false && Install(Pkg,FileNames[Pkg->ID]) == false)
 875          return false;
 876       for (PkgIterator P = Pkg.Group().PackageList();
 877            P.end() == false; P = Pkg.Group().NextPkg(P))
 878       {
 879          if (P->CurrentVer != 0 || P == Pkg || List->IsFlag(P,pkgOrderList::UnPacked) == true ||
 880              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 881               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 882             continue;
 883          if (SmartUnPack(P, false, Depth + 1) == false)
 884             return false;
 885       }
 886    }
 887    // packages which are already unpacked don't need to be unpacked again
 888    else if ((instVer != Pkg.CurrentVer() ||
 889              ((Cache[Pkg].iFlags & pkgDepCache::ReInstall) == pkgDepCache::ReInstall)) &&
 890             Install(Pkg,FileNames[Pkg->ID]) == false)
 891       return false;
 892
 893    if (Immediate == true) {
 894       // Perform immedate configuration of the package.
 895          if (SmartConfigure(Pkg, Depth + 1) == false)
 896             _error->Warning(_("Could not perform immediate configuration on '%s'. "
 897                "Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.FullName().c_str(),2);
 898    }
 899
 900    return true;
 901 }
 902                                                                         /*}}}*/
 903 // PM::OrderInstall - Installation ordering routine                     /*{{{*/
 904 // ---------------------------------------------------------------------
 905 /* */
 906 pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
 907 {
 908    if (CreateOrderList() == false)
 909       return Failed;
 910
 911    Reset();
 912
 913    if (Debug == true)
 914       clog << "Beginning to order" << endl;
 915
 916    bool const ordering =
 917         _config->FindB("PackageManager::UnpackAll",true) ?
 918                 List->OrderUnpack(FileNames) : List->OrderCritical();
 919    if (ordering == false)
 920    {
 921       _error->Error("Internal ordering error");
 922       return Failed;
 923    }
 924
 925    if (Debug == true)
 926       clog << "Done ordering" << endl;
 927
 928    bool DoneSomething = false;
 929    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
 930    {
 931       PkgIterator Pkg(Cache,*I);
 932
 933       if (List->IsNow(Pkg) == false)
 934       {
 935          if (!List->IsFlag(Pkg,pkgOrderList::Configured) && !NoImmConfigure) {
 936             if (SmartConfigure(Pkg, 0) == false && Debug)
 937                _error->Warning("Internal Error, Could not configure %s",Pkg.FullName().c_str());
 938             // FIXME: The above warning message might need changing
 939          } else {
 940             if (Debug == true)
 941                clog << "Skipping already done " << Pkg.FullName() << endl;
 942          }
 943          continue;
 944
 945       }
 946
 947       if (List->IsMissing(Pkg) == true)
 948       {
 949          if (Debug == true)
 950             clog << "Sequence completed at " << Pkg.FullName() << endl;
 951          if (DoneSomething == false)
 952          {
 953             _error->Error("Internal Error, ordering was unable to handle the media swap");
 954             return Failed;
 955          }
 956          return Incomplete;
 957       }
 958
 959       // Sanity check
 960       if (Cache[Pkg].Keep() == true &&
 961           Pkg.State() == pkgCache::PkgIterator::NeedsNothing &&
 962           (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall)
 963       {
 964          _error->Error("Internal Error, trying to manipulate a kept package (%s)",Pkg.FullName().c_str());
 965          return Failed;
 966       }
 967
 968       // Perform a delete or an install
 969       if (Cache[Pkg].Delete() == true)
 970       {
 971          if (SmartRemove(Pkg) == false)
 972             return Failed;
 973       }
 974       else
 975          if (SmartUnPack(Pkg,List->IsFlag(Pkg,pkgOrderList::Immediate),0) == false)
 976             return Failed;
 977       DoneSomething = true;
 978
 979       if (ImmConfigureAll) {
 980          /* ConfigureAll here to pick up and packages left unconfigured becuase they were unpacked in the
 981             "PreUnpack Checks" section */
 982          if (!ConfigureAll())
 983             return Failed;
 984       }
 985    }
 986
 987    // Final run through the configure phase
 988    if (ConfigureAll() == false)
 989       return Failed;
 990
 991    // Sanity check
 992    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
 993    {
 994       if (List->IsFlag(*I,pkgOrderList::Configured) == false)
 995       {
 996          _error->Error("Internal error, packages left unconfigured. %s",
 997                        PkgIterator(Cache,*I).FullName().c_str());
 998          return Failed;
 999       }
1000    }
1001
1002    return Completed;
1003 }
1004                                                                         /*}}}*/
1005 // PM::DoInstallPostFork - Does install part that happens after the fork /*{{{*/
1006 // ---------------------------------------------------------------------
1007 pkgPackageManager::OrderResult
1008 pkgPackageManager::DoInstallPostFork(int statusFd)
1009 {
1010       if(statusFd > 0)
1011          // FIXME: use SetCloseExec here once it taught about throwing
1012          //        exceptions instead of doing _exit(100) on failure
1013          fcntl(statusFd,F_SETFD,FD_CLOEXEC);
1014       bool goResult = Go(statusFd);
1015       if(goResult == false)
1016          return Failed;
1017
1018       return Res;
1019 };
1020
1021 // PM::DoInstall - Does the installation                                /*{{{*/
1022 // ---------------------------------------------------------------------
1023 /* This uses the filenames in FileNames and the information in the
1024    DepCache to perform the installation of packages.*/
1025 pkgPackageManager::OrderResult pkgPackageManager::DoInstall(int statusFd)
1026 {
1027    if(DoInstallPreFork() == Failed)
1028       return Failed;
1029
1030    return DoInstallPostFork(statusFd);
1031 }
1032                                                                         /*}}}*/