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