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.ParentPkg() == 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             Bad = false;
 408             if (List->IsNow(DepPkg) && !List->IsFlag(DepPkg,pkgOrderList::Loop)) {
 409                List->Flag(Pkg,pkgOrderList::Loop);
 410                if (Debug)
 411                   cout << OutputInDepth(Depth) << "Unpacking " << DepPkg.Name() << " to avoid loop" << endl;
 412                SmartUnPack(DepPkg, true, Depth + 1);
 413                List->RmFlag(Pkg,pkgOrderList::Loop);
 414             }
 415          }
 416
 417          if (Start==End) {
 418             if (Bad && Debug) {
 419                if (!List->IsFlag(DepPkg,pkgOrderList::Loop)) {
 420                   _error->Warning("Could not satisfy dependancies for %s",Pkg.Name());
 421                }
 422             }
 423             break;
 424          } else {
 425             Start++;
 426          }
 427       }
 428    }
 429
 430    if (Bad) {
 431       if (Debug)
 432          _error->Warning(_("Could not configure '%s'. "),Pkg.Name());
 433       return false;
 434    }
 435
 436    if (PkgLoop) return true;
 437
 438    static std::string const conf = _config->Find("PackageManager::Configure","all");
 439    static bool const ConfigurePkgs = (conf == "all" || conf == "smart");
 440
 441    if (List->IsFlag(Pkg,pkgOrderList::Configured))
 442       return _error->Error("Internal configure error on '%s'.", Pkg.Name());
 443
 444    if (ConfigurePkgs == true && Configure(Pkg) == false)
 445       return false;
 446
 447    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 448
 449    if ((Cache[Pkg].InstVerIter(Cache)->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
 450       for (PkgIterator P = Pkg.Group().PackageList();
 451            P.end() == false; P = Pkg.Group().NextPkg(P))
 452       {
 453          if (Pkg == P || List->IsFlag(P,pkgOrderList::Configured) == true ||
 454              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 455               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 456             continue;
 457          SmartConfigure(P, (Depth +1));
 458       }
 459
 460    // Sanity Check
 461    if (List->IsFlag(Pkg,pkgOrderList::Configured) == false)
 462       return _error->Error(_("Could not configure '%s'. "),Pkg.Name());
 463
 464    return true;
 465 }
 466                                                                         /*}}}*/
 467 // PM::EarlyRemove - Perform removal of packages before their time      /*{{{*/
 468 // ---------------------------------------------------------------------
 469 /* This is called to deal with conflicts arising from unpacking */
 470 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
 471 {
 472    if (List->IsNow(Pkg) == false)
 473       return true;
 474
 475    // Already removed it
 476    if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
 477       return true;
 478
 479    // Woops, it will not be re-installed!
 480    if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
 481       return false;
 482
 483    // Essential packages get special treatment
 484    bool IsEssential = false;
 485    if ((Pkg->Flags & pkgCache::Flag::Essential) != 0)
 486       IsEssential = true;
 487
 488    /* Check for packages that are the dependents of essential packages and
 489       promote them too */
 490    if (Pkg->CurrentVer != 0)
 491    {
 492       for (DepIterator D = Pkg.RevDependsList(); D.end() == false &&
 493            IsEssential == false; ++D)
 494          if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 495             if ((D.ParentPkg()->Flags & pkgCache::Flag::Essential) != 0)
 496                IsEssential = true;
 497    }
 498
 499    if (IsEssential == true)
 500    {
 501       if (_config->FindB("APT::Force-LoopBreak",false) == false)
 502          return _error->Error(_("This installation run will require temporarily "
 503                                 "removing the essential package %s due to a "
 504                                 "Conflicts/Pre-Depends loop. This is often bad, "
 505                                 "but if you really want to do it, activate the "
 506                                 "APT::Force-LoopBreak option."),Pkg.Name());
 507    }
 508
 509    bool Res = SmartRemove(Pkg);
 510    if (Cache[Pkg].Delete() == false)
 511       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
 512
 513    return Res;
 514 }
 515                                                                         /*}}}*/
 516 // PM::SmartRemove - Removal Helper                                     /*{{{*/
 517 // ---------------------------------------------------------------------
 518 /* */
 519 bool pkgPackageManager::SmartRemove(PkgIterator Pkg)
 520 {
 521    if (List->IsNow(Pkg) == false)
 522       return true;
 523
 524    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 525
 526    return Remove(Pkg,(Cache[Pkg].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge);
 527    return true;
 528 }
 529                                                                         /*}}}*/
 530 // PM::SmartUnPack - Install helper                                     /*{{{*/
 531 // ---------------------------------------------------------------------
 532 /* This puts the system in a state where it can Unpack Pkg, if Pkg is allready
 533    unpacked, or when it has been unpacked, if Immediate==true it configures it. */
 534 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
 535 {
 536    return SmartUnPack(Pkg, true, 0);
 537 }
 538 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int const Depth)
 539 {
 540    bool PkgLoop = List->IsFlag(Pkg,pkgOrderList::Loop);
 541
 542    if (Debug) {
 543       clog << OutputInDepth(Depth) << "SmartUnPack " << Pkg.Name();
 544       VerIterator InstallVer = VerIterator(Cache,Cache[Pkg].InstallVer);
 545       if (Pkg.CurrentVer() == 0)
 546         cout << " (install version " << InstallVer.VerStr() << ")";
 547       else
 548         cout << " (replace version " << Pkg.CurrentVer().VerStr() << " with " << InstallVer.VerStr() << ")";
 549       if (PkgLoop)
 550         cout << " (Only Perform PreUnpack Checks)";
 551       cout << endl;
 552    }
 553
 554    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
 555
 556    /* PreUnpack Checks: This loop checks and attempts to rectify and problems that would prevent the package being unpacked.
 557       It addresses: PreDepends, Conflicts, Obsoletes and Breaks (DpkgBreaks). Any resolutions that do not require it should
 558       avoid configuration (calling SmartUnpack with Immediate=true), this is because when unpacking some packages with
 559       complex dependancy structures, trying to configure some packages while breaking the loops can complicate things .
 560       This will be either dealt with if the package is configured as a dependency of Pkg (if and when Pkg is configured),
 561       or by the ConfigureAll call at the end of the for loop in OrderInstall. */
 562    for (DepIterator D = instVer.DependsList();
 563         D.end() == false; )
 564    {
 565       // Compute a single dependency element (glob or)
 566       pkgCache::DepIterator Start;
 567       pkgCache::DepIterator End;
 568       D.GlobOr(Start,End);
 569
 570       while (End->Type == pkgCache::Dep::PreDepends)
 571       {
 572          if (Debug)
 573             clog << OutputInDepth(Depth) << "PreDepends order for " << Pkg.Name() << std::endl;
 574
 575          // Look for possible ok targets.
 576          SPtrArray<Version *> VList = Start.AllTargets();
 577          bool Bad = true;
 578          for (Version **I = VList; *I != 0 && Bad == true; I++)
 579          {
 580             VerIterator Ver(Cache,*I);
 581             PkgIterator Pkg = Ver.ParentPkg();
 582
 583             // See if the current version is ok
 584             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 585                 Pkg.State() == PkgIterator::NeedsNothing)
 586             {
 587                Bad = false;
 588                if (Debug)
 589                   clog << OutputInDepth(Depth) << "Found ok package " << Pkg.Name() << endl;
 590                continue;
 591             }
 592          }
 593
 594          // Look for something that could be configured.
 595          for (Version **I = VList; *I != 0 && Bad == true; I++)
 596          {
 597             VerIterator Ver(Cache,*I);
 598             PkgIterator Pkg = Ver.ParentPkg();
 599
 600             // Not the install version
 601             if (Cache[Pkg].InstallVer != *I ||
 602                 (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 603                continue;
 604
 605             if (List->IsFlag(Pkg,pkgOrderList::Configured)) {
 606                Bad = false;
 607                continue;
 608             }
 609
 610             if (Debug)
 611                clog << OutputInDepth(Depth) << "Trying to SmartConfigure " << Pkg.Name() << endl;
 612             Bad = !SmartConfigure(Pkg, Depth + 1);
 613          }
 614
 615          /* If this or element did not match then continue on to the
 616             next or element until a matching element is found */
 617          if (Bad == true)
 618          {
 619             // This triggers if someone make a pre-depends/depend loop.
 620             if (Start == End)
 621                return _error->Error("Couldn't configure pre-depend %s for %s, "
 622                                     "probably a dependency cycle.",
 623                                     End.TargetPkg().Name(),Pkg.Name());
 624             ++Start;
 625          }
 626          else
 627             break;
 628       }
 629
 630       if (End->Type == pkgCache::Dep::Conflicts ||
 631           End->Type == pkgCache::Dep::Obsoletes)
 632       {
 633          /* Look for conflicts. Two packages that are both in the install
 634             state cannot conflict so we don't check.. */
 635          SPtrArray<Version *> VList = End.AllTargets();
 636          for (Version **I = VList; *I != 0; I++)
 637          {
 638             VerIterator Ver(Cache,*I);
 639             PkgIterator ConflictPkg = Ver.ParentPkg();
 640             VerIterator InstallVer(Cache,Cache[ConflictPkg].InstallVer);
 641
 642             // See if the current version is conflicting
 643             if (ConflictPkg.CurrentVer() == Ver && List->IsNow(ConflictPkg))
 644             {
 645                cout << OutputInDepth(Depth) << Pkg.Name() << " conflicts with " << ConflictPkg.Name() << endl;
 646                /* If a loop is not present or has not yet been detected, attempt to unpack packages
 647                   to resolve this conflict. If there is a loop present, remove packages to resolve this conflict */
 648                if (!List->IsFlag(ConflictPkg,pkgOrderList::Loop)) {
 649                   if (Cache[ConflictPkg].Keep() == 0 && Cache[ConflictPkg].InstallVer != 0) {
 650                       if (Debug)
 651                         cout << OutputInDepth(Depth) << OutputInDepth(Depth) << "Unpacking " << ConflictPkg.Name() << " to prevent conflict" << endl;
 652                       List->Flag(Pkg,pkgOrderList::Loop);
 653                       SmartUnPack(ConflictPkg,false, Depth + 1);
 654                       // Remove loop to allow it to be used later if needed
 655                       List->RmFlag(Pkg,pkgOrderList::Loop);
 656                   } else {
 657                       if (EarlyRemove(ConflictPkg) == false)
 658                          return _error->Error("Internal Error, Could not early remove %s",ConflictPkg.Name());
 659                   }
 660                } else {
 661                   if (!List->IsFlag(ConflictPkg,pkgOrderList::Removed)) {
 662                       if (Debug)
 663                          cout << OutputInDepth(Depth) << "Because of conficts knot, removing " << ConflictPkg.Name() << " to conflict violation" << endl;
 664                       if (EarlyRemove(ConflictPkg) == false)
 665                           return _error->Error("Internal Error, Could not early remove %s",ConflictPkg.Name());
 666                   }
 667                }
 668             }
 669          }
 670       }
 671
 672       // Check for breaks
 673       if (End->Type == pkgCache::Dep::DpkgBreaks) {
 674          SPtrArray<Version *> VList = End.AllTargets();
 675          for (Version **I = VList; *I != 0; I++)
 676          {
 677             VerIterator Ver(Cache,*I);
 678             PkgIterator BrokenPkg = Ver.ParentPkg();
 679             VerIterator InstallVer(Cache,Cache[BrokenPkg].InstallVer);
 680
 681             // Check if it needs to be unpacked
 682             if (List->IsFlag(BrokenPkg,pkgOrderList::InList) && Cache[BrokenPkg].Delete() == false &&
 683                 List->IsNow(BrokenPkg)) {
 684               if (List->IsFlag(BrokenPkg,pkgOrderList::Loop) && PkgLoop) {
 685                 // This dependancy has already been dealt with by another SmartUnPack on Pkg
 686                 break;
 687               } else if (List->IsFlag(Pkg,pkgOrderList::Loop)) {
 688                 /* Found a break, so unpack the package, but dont remove loop as already set.
 689                    This means that there is another SmartUnPack call for this
 690                    package and it will remove the loop flag. */
 691                 if (Debug)
 692                   cout << OutputInDepth(Depth) << "  Unpacking " << BrokenPkg.Name() << " to avoid break" << endl;
 693
 694                 SmartUnPack(BrokenPkg, false, Depth + 1);
 695               } else {
 696                 List->Flag(Pkg,pkgOrderList::Loop);
 697                 // Found a break, so unpack the package
 698                 if (Debug)
 699                   cout << OutputInDepth(Depth) << "  Unpacking " << BrokenPkg.Name() << " to avoid break" << endl;
 700
 701                 SmartUnPack(BrokenPkg, false, Depth + 1);
 702                 List->RmFlag(Pkg,pkgOrderList::Loop);
 703               }
 704             }
 705
 706             // Check if a package needs to be removed
 707             if (Cache[BrokenPkg].Delete() == true && !List->IsFlag(BrokenPkg,pkgOrderList::Configured)) {
 708               if (Debug)
 709                  cout << OutputInDepth(Depth) << "  Removing " << BrokenPkg.Name() << " to avoid break" << endl;
 710               SmartRemove(BrokenPkg);
 711             }
 712          }
 713       }
 714    }
 715
 716    // Check for reverse conflicts.
 717    if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
 718                    instVer.VerStr()) == false)
 719                           return false;
 720
 721    for (PrvIterator P = instVer.ProvidesList();
 722         P.end() == false; ++P)
 723       if (Pkg->Group != P.OwnerPkg()->Group)
 724          CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());
 725
 726    if (PkgLoop)
 727       return true;
 728
 729    List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 730
 731    if (Immediate == true && instVer->MultiArch == pkgCache::Version::Same)
 732    {
 733       /* Do lockstep M-A:same unpacking in two phases:
 734          First unpack all installed architectures, then the not installed.
 735          This way we avoid that M-A: enabled packages are installed before
 736          their older non-M-A enabled packages are replaced by newer versions */
 737       bool const installed = Pkg->CurrentVer != 0;
 738       if (installed == true && Install(Pkg,FileNames[Pkg->ID]) == false)
 739          return false;
 740       for (PkgIterator P = Pkg.Group().PackageList();
 741            P.end() == false; P = Pkg.Group().NextPkg(P))
 742       {
 743          if (P->CurrentVer == 0 || P == Pkg || List->IsFlag(P,pkgOrderList::UnPacked) == true ||
 744              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 745               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 746             continue;
 747          if (SmartUnPack(P, false, Depth + 1) == false)
 748             return false;
 749       }
 750       if (installed == false && Install(Pkg,FileNames[Pkg->ID]) == false)
 751          return false;
 752       for (PkgIterator P = Pkg.Group().PackageList();
 753            P.end() == false; P = Pkg.Group().NextPkg(P))
 754       {
 755          if (P->CurrentVer != 0 || P == Pkg || List->IsFlag(P,pkgOrderList::UnPacked) == true ||
 756              Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
 757               (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
 758             continue;
 759          if (SmartUnPack(P, false, Depth + 1) == false)
 760             return false;
 761       }
 762    }
 763    // packages which are already unpacked don't need to be unpacked again
 764    else if (Pkg.State() != pkgCache::PkgIterator::NeedsConfigure && Install(Pkg,FileNames[Pkg->ID]) == false)
 765       return false;
 766
 767    if (Immediate == true) {
 768       // Perform immedate configuration of the package.
 769          if (SmartConfigure(Pkg, Depth + 1) == false)
 770             _error->Warning(_("Could not perform immediate configuration on '%s'. "
 771                "Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.Name(),2);
 772    }
 773
 774    return true;
 775 }
 776                                                                         /*}}}*/
 777 // PM::OrderInstall - Installation ordering routine                     /*{{{*/
 778 // ---------------------------------------------------------------------
 779 /* */
 780 pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
 781 {
 782    if (CreateOrderList() == false)
 783       return Failed;
 784
 785    Reset();
 786
 787    if (Debug == true)
 788       clog << "Beginning to order" << endl;
 789
 790    bool const ordering =
 791         _config->FindB("PackageManager::UnpackAll",true) ?
 792                 List->OrderUnpack(FileNames) : List->OrderCritical();
 793    if (ordering == false)
 794    {
 795       _error->Error("Internal ordering error");
 796       return Failed;
 797    }
 798
 799    if (Debug == true)
 800       clog << "Done ordering" << endl;
 801
 802    bool DoneSomething = false;
 803    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
 804    {
 805       PkgIterator Pkg(Cache,*I);
 806
 807       if (List->IsNow(Pkg) == false)
 808       {
 809          if (!List->IsFlag(Pkg,pkgOrderList::Configured) && !NoImmConfigure) {
 810             if (SmartConfigure(Pkg, 0) == false && Debug)
 811                _error->Warning("Internal Error, Could not configure %s",Pkg.Name());
 812             // FIXME: The above warning message might need changing
 813          } else {
 814             if (Debug == true)
 815                clog << "Skipping already done " << Pkg.Name() << endl;
 816          }
 817          continue;
 818
 819       }
 820
 821       if (List->IsMissing(Pkg) == true)
 822       {
 823          if (Debug == true)
 824             clog << "Sequence completed at " << Pkg.Name() << endl;
 825          if (DoneSomething == false)
 826          {
 827             _error->Error("Internal Error, ordering was unable to handle the media swap");
 828             return Failed;
 829          }
 830          return Incomplete;
 831       }
 832
 833       // Sanity check
 834       if (Cache[Pkg].Keep() == true &&
 835           Pkg.State() == pkgCache::PkgIterator::NeedsNothing &&
 836           (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall)
 837       {
 838          _error->Error("Internal Error, trying to manipulate a kept package (%s)",Pkg.Name());
 839          return Failed;
 840       }
 841
 842       // Perform a delete or an install
 843       if (Cache[Pkg].Delete() == true)
 844       {
 845          if (SmartRemove(Pkg) == false)
 846             return Failed;
 847       }
 848       else
 849          if (SmartUnPack(Pkg,List->IsFlag(Pkg,pkgOrderList::Immediate),0) == false)
 850             return Failed;
 851       DoneSomething = true;
 852
 853       if (ImmConfigureAll) {
 854          /* ConfigureAll here to pick up and packages left unconfigured becuase they were unpacked in the
 855             "PreUnpack Checks" section */
 856          if (!ConfigureAll())
 857             return Failed;
 858       }
 859    }
 860
 861    // Final run through the configure phase
 862    if (ConfigureAll() == false)
 863       return Failed;
 864
 865    // Sanity check
 866    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
 867    {
 868       if (List->IsFlag(*I,pkgOrderList::Configured) == false)
 869       {
 870          _error->Error("Internal error, packages left unconfigured. %s",
 871                        PkgIterator(Cache,*I).Name());
 872          return Failed;
 873       }
 874    }
 875
 876    return Completed;
 877 }
 878                                                                         /*}}}*/
 879 // PM::DoInstallPostFork - Does install part that happens after the fork /*{{{*/
 880 // ---------------------------------------------------------------------
 881 pkgPackageManager::OrderResult
 882 pkgPackageManager::DoInstallPostFork(int statusFd)
 883 {
 884       if(statusFd > 0)
 885          // FIXME: use SetCloseExec here once it taught about throwing
 886          //        exceptions instead of doing _exit(100) on failure
 887          fcntl(statusFd,F_SETFD,FD_CLOEXEC);
 888       bool goResult = Go(statusFd);
 889       if(goResult == false)
 890          return Failed;
 891
 892       return Res;
 893 };
 894
 895 // PM::DoInstall - Does the installation                                /*{{{*/
 896 // ---------------------------------------------------------------------
 897 /* This uses the filenames in FileNames and the information in the
 898    DepCache to perform the installation of packages.*/
 899 pkgPackageManager::OrderResult pkgPackageManager::DoInstall(int statusFd)
 900 {
 901    if(DoInstallPreFork() == Failed)
 902       return Failed;
 903
 904    return DoInstallPostFork(statusFd);
 905 }
 906                                                                         /*}}}*/