apt-pkg/packagemanager.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: packagemanager.cc,v 1.25 2000/05/12 04:26:42 jgg 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 #ifdef __GNUG__
  17 #pragma implementation "apt-pkg/packagemanager.h"
  18 #endif
  19 #include <apt-pkg/packagemanager.h>
  20 #include <apt-pkg/orderlist.h>
  21 #include <apt-pkg/depcache.h>
  22 #include <apt-pkg/error.h>
  23 #include <apt-pkg/version.h>
  24 #include <apt-pkg/acquire-item.h>
  25 #include <apt-pkg/algorithms.h>
  26 #include <apt-pkg/configuration.h>
  27                                                                         /*}}}*/
  28
  29 // PM::PackageManager - Constructor                                     /*{{{*/
  30 // ---------------------------------------------------------------------
  31 /* */
  32 pkgPackageManager::pkgPackageManager(pkgDepCache &Cache) : Cache(Cache)
  33 {
  34    FileNames = new string[Cache.Head().PackageCount];
  35    List = 0;
  36    Debug = _config->FindB("Debug::pkgPackageManager",false);
  37 }
  38                                                                         /*}}}*/
  39 // PM::PackageManager - Destructor                                      /*{{{*/
  40 // ---------------------------------------------------------------------
  41 /* */
  42 pkgPackageManager::~pkgPackageManager()
  43 {
  44    delete List;
  45    delete [] FileNames;
  46 }
  47                                                                         /*}}}*/
  48 // PM::GetArchives - Queue the archives for download                    /*{{{*/
  49 // ---------------------------------------------------------------------
  50 /* */
  51 bool pkgPackageManager::GetArchives(pkgAcquire *Owner,pkgSourceList *Sources,
  52                                     pkgRecords *Recs)
  53 {
  54    if (CreateOrderList() == false)
  55       return false;
  56
  57    if (List->OrderUnpack() == false)
  58       return _error->Error("Internal ordering error");
  59
  60    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
  61    {
  62       PkgIterator Pkg(Cache,*I);
  63       FileNames[Pkg->ID] = string();
  64
  65       // Skip packages to erase
  66       if (Cache[Pkg].Delete() == true)
  67          continue;
  68
  69       // Skip Packages that need configure only.
  70       if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
  71           Cache[Pkg].Keep() == true)
  72          continue;
  73
  74       // Skip already processed packages
  75       if (List->IsNow(Pkg) == false)
  76          continue;
  77
  78       new pkgAcqArchive(Owner,Sources,Recs,Cache[Pkg].InstVerIter(Cache),
  79                         FileNames[Pkg->ID]);
  80    }
  81
  82    return true;
  83 }
  84                                                                         /*}}}*/
  85 // PM::FixMissing - Keep all missing packages                           /*{{{*/
  86 // ---------------------------------------------------------------------
  87 /* This is called to correct the installation when packages could not
  88    be downloaded. */
  89 bool pkgPackageManager::FixMissing()
  90 {
  91    pkgProblemResolver Resolve(Cache);
  92    List->SetFileList(FileNames);
  93
  94    bool Bad = false;
  95    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
  96    {
  97       if (List->IsMissing(I) == false)
  98          continue;
  99
 100       // Okay, this file is missing and we need it. Mark it for keep
 101       Bad = true;
 102       Cache.MarkKeep(I);
 103    }
 104
 105    // We have to empty the list otherwise it will not have the new changes
 106    delete List;
 107    List = 0;
 108
 109    if (Bad == false)
 110       return true;
 111
 112    // Now downgrade everything that is broken
 113    return Resolve.ResolveByKeep() == true && Cache.BrokenCount() == 0;
 114 }
 115                                                                         /*}}}*/
 116
 117 // PM::CreateOrderList - Create the ordering class                      /*{{{*/
 118 // ---------------------------------------------------------------------
 119 /* This populates the ordering list with all the packages that are
 120    going to change. */
 121 bool pkgPackageManager::CreateOrderList()
 122 {
 123    if (List != 0)
 124       return true;
 125
 126    delete List;
 127    List = new pkgOrderList(Cache);
 128
 129    bool NoImmConfigure = _config->FindB("APT::Immediate-Configure",false);
 130
 131    // Generate the list of affected packages and sort it
 132    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
 133    {
 134       // Mark the package and its dependends for immediate configuration
 135       if (((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential ||
 136            (I->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important) &&
 137           NoImmConfigure == false)
 138       {
 139          List->Flag(I,pkgOrderList::Immediate);
 140
 141          // Look for other packages to make immediate configurea
 142          if (Cache[I].InstallVer != 0)
 143             for (DepIterator D = Cache[I].InstVerIter(Cache).DependsList();
 144                  D.end() == false; D++)
 145                if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 146                   List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
 147
 148          // And again with the current version.
 149          if (I->CurrentVer != 0)
 150             for (DepIterator D = I.CurrentVer().DependsList();
 151                  D.end() == false; D++)
 152                if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 153                   List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
 154       }
 155
 156       // Not interesting
 157       if ((Cache[I].Keep() == true ||
 158           Cache[I].InstVerIter(Cache) == I.CurrentVer()) &&
 159           I.State() == pkgCache::PkgIterator::NeedsNothing &&
 160           (Cache[I].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall &&
 161           (I.Purge() != false || Cache[I].Mode != pkgDepCache::ModeDelete ||
 162            (Cache[I].iFlags & pkgDepCache::Purge) != pkgDepCache::Purge))
 163          continue;
 164
 165       // Append it to the list
 166       List->push_back(I);
 167    }
 168
 169    return true;
 170 }
 171                                                                         /*}}}*/
 172 // PM::DepAlwaysTrue - Returns true if this dep is irrelevent           /*{{{*/
 173 // ---------------------------------------------------------------------
 174 /* The restriction on provides is to eliminate the case when provides
 175    are transitioning between valid states [ie exim to smail] */
 176 bool pkgPackageManager::DepAlwaysTrue(DepIterator D)
 177 {
 178    if (D.TargetPkg()->ProvidesList != 0)
 179       return false;
 180
 181    if ((Cache[D] & pkgDepCache::DepInstall) != 0 &&
 182        (Cache[D] & pkgDepCache::DepNow) != 0)
 183       return true;
 184    return false;
 185 }
 186                                                                         /*}}}*/
 187 // PM::CheckRConflicts - Look for reverse conflicts                     /*{{{*/
 188 // ---------------------------------------------------------------------
 189 /* This looks over the reverses for a conflicts line that needs early
 190    removal. */
 191 bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
 192                                         const char *Ver)
 193 {
 194    for (;D.end() == false; D++)
 195    {
 196       if (D->Type != pkgCache::Dep::Conflicts)
 197          continue;
 198
 199       // The package hasnt been changed
 200       if (List->IsNow(Pkg) == false)
 201          continue;
 202
 203       // Ignore self conflicts, ignore conflicts from irrelevent versions
 204       if (D.ParentPkg() == Pkg || D.ParentVer() != D.ParentPkg().CurrentVer())
 205          continue;
 206
 207       if (pkgCheckDep(D.TargetVer(),Ver,D->CompareOp) == false)
 208          continue;
 209
 210       if (EarlyRemove(D.ParentPkg()) == false)
 211          return _error->Error("Reverse conflicts early remove for package '%s' failed",
 212                               Pkg.Name());
 213    }
 214    return true;
 215 }
 216                                                                         /*}}}*/
 217 // PM::ConfigureAll - Run the all out configuration                     /*{{{*/
 218 // ---------------------------------------------------------------------
 219 /* This configures every package. It is assumed they are all unpacked and
 220    that the final configuration is valid. */
 221 bool pkgPackageManager::ConfigureAll()
 222 {
 223    pkgOrderList OList(Cache);
 224
 225    // Populate the order list
 226    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 227       if (List->IsFlag(pkgCache::PkgIterator(Cache,*I),
 228                        pkgOrderList::UnPacked) == true)
 229          OList.push_back(*I);
 230
 231    if (OList.OrderConfigure() == false)
 232       return false;
 233
 234    // Perform the configuring
 235    for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
 236    {
 237       PkgIterator Pkg(Cache,*I);
 238
 239       if (Configure(Pkg) == false)
 240          return false;
 241
 242       List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 243    }
 244
 245    return true;
 246 }
 247                                                                         /*}}}*/
 248 // PM::SmartConfigure - Perform immediate configuration of the pkg      /*{{{*/
 249 // ---------------------------------------------------------------------
 250 /* This routine scheduals the configuration of the given package and all
 251    of it's dependents. */
 252 bool pkgPackageManager::SmartConfigure(PkgIterator Pkg)
 253 {
 254    pkgOrderList OList(Cache);
 255
 256    if (DepAdd(OList,Pkg) == false)
 257       return false;
 258
 259    if (OList.OrderConfigure() == false)
 260       return false;
 261
 262    // Perform the configuring
 263    for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
 264    {
 265       PkgIterator Pkg(Cache,*I);
 266
 267       if (Configure(Pkg) == false)
 268          return false;
 269
 270       List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 271    }
 272
 273    // Sanity Check
 274    if (List->IsFlag(Pkg,pkgOrderList::Configured) == false)
 275       return _error->Error("Internal error, could not immediate configure %s",Pkg.Name());
 276
 277    return true;
 278 }
 279                                                                         /*}}}*/
 280 // PM::DepAdd - Add all dependents to the oder list                     /*{{{*/
 281 // ---------------------------------------------------------------------
 282 /* This recursively adds all dependents to the order list */
 283 bool pkgPackageManager::DepAdd(pkgOrderList &OList,PkgIterator Pkg,int Depth)
 284 {
 285    if (OList.IsFlag(Pkg,pkgOrderList::Added) == true)
 286       return true;
 287    if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
 288       return true;
 289    if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == false)
 290       return false;
 291
 292
 293    // Put the package on the list
 294    OList.push_back(Pkg);
 295    OList.Flag(Pkg,pkgOrderList::Added);
 296    Depth++;
 297
 298    // Check the dependencies to see if they are all satisfied.
 299    bool Bad = false;
 300    for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); D.end() == false;)
 301    {
 302       if (D->Type != pkgCache::Dep::Depends && D->Type != pkgCache::Dep::PreDepends)
 303       {
 304          D++;
 305          continue;
 306       }
 307
 308       // Grok or groups
 309       Bad = true;
 310       for (bool LastOR = true; D.end() == false && LastOR == true; D++)
 311       {
 312          LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
 313
 314          if (Bad == false)
 315             continue;
 316
 317          Version **VList = D.AllTargets();
 318          for (Version **I = VList; *I != 0 && Bad == true; I++)
 319          {
 320             VerIterator Ver(Cache,*I);
 321             PkgIterator Pkg = Ver.ParentPkg();
 322
 323             // See if the current version is ok
 324             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 325                 Pkg.State() == PkgIterator::NeedsNothing)
 326             {
 327                Bad = false;
 328                continue;
 329             }
 330
 331             // Not the install version
 332             if (Cache[Pkg].InstallVer != *I ||
 333                 (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 334                continue;
 335             if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == true)
 336                Bad = !DepAdd(OList,Pkg,Depth);
 337             if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
 338                Bad = false;
 339          }
 340          delete [] VList;
 341       }
 342
 343       if (Bad == true)
 344       {
 345          OList.Flag(Pkg,0,pkgOrderList::Added);
 346          OList.pop_back();
 347          Depth--;
 348          return false;
 349       }
 350    }
 351
 352    Depth--;
 353    return true;
 354 }
 355                                                                         /*}}}*/
 356 // PM::EarlyRemove - Perform removal of packages before their time      /*{{{*/
 357 // ---------------------------------------------------------------------
 358 /* This is called to deal with conflicts arising from unpacking */
 359 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
 360 {
 361    if (List->IsNow(Pkg) == false)
 362       return true;
 363
 364    // Already removed it
 365    if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
 366       return true;
 367
 368    // Woops, it will not be re-installed!
 369    if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
 370       return false;
 371
 372    // Essential packages get special treatment
 373    bool IsEssential = false;
 374    if ((Pkg->Flags & pkgCache::Flag::Essential) != 0)
 375       IsEssential = true;
 376
 377    /* Check for packages that are the dependents of essential packages and
 378       promote them too */
 379    if (Pkg->CurrentVer != 0)
 380    {
 381       for (DepIterator D = Pkg.RevDependsList(); D.end() == false &&
 382            IsEssential == false; D++)
 383          if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 384             if ((D.ParentPkg()->Flags & pkgCache::Flag::Essential) != 0)
 385                IsEssential = true;
 386    }
 387
 388    if (IsEssential == true)
 389    {
 390       if (_config->FindB("APT::Force-LoopBreak",false) == false)
 391          return _error->Error("This installation run will require temporarily "
 392                               "removing the essential package %s due to a "
 393                               "Conflicts/Pre-Depends loop. This is often bad, "
 394                               "but if you really want to do it, activate the "
 395                               "APT::Force-LoopBreak option.",Pkg.Name());
 396    }
 397
 398    bool Res = SmartRemove(Pkg);
 399    if (Cache[Pkg].Delete() == false)
 400       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
 401
 402    return Res;
 403 }
 404                                                                         /*}}}*/
 405 // PM::SmartRemove - Removal Helper                                     /*{{{*/
 406 // ---------------------------------------------------------------------
 407 /* */
 408 bool pkgPackageManager::SmartRemove(PkgIterator Pkg)
 409 {
 410    if (List->IsNow(Pkg) == false)
 411       return true;
 412
 413    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 414    return Remove(Pkg,(Cache[Pkg].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge);
 415 }
 416                                                                         /*}}}*/
 417 // PM::SmartUnPack - Install helper                                     /*{{{*/
 418 // ---------------------------------------------------------------------
 419 /* This performs the task of handling pre-depends. */
 420 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
 421 {
 422    // Check if it is already unpacked
 423    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 424        Cache[Pkg].Keep() == true)
 425    {
 426       List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 427       if (List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
 428          if (SmartConfigure(Pkg) == false)
 429             return _error->Error("Internal Error, Could not perform immediate configuration");
 430       return true;
 431    }
 432
 433    /* See if this packages install version has any predependencies
 434       that are not met by 'now' packages. */
 435    for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList();
 436         D.end() == false; )
 437    {
 438       // Compute a single dependency element (glob or)
 439       pkgCache::DepIterator Start;
 440       pkgCache::DepIterator End;
 441       D.GlobOr(Start,End);
 442
 443       while (End->Type == pkgCache::Dep::PreDepends)
 444       {
 445          // Look for possible ok targets.
 446          Version **VList = Start.AllTargets();
 447          bool Bad = true;
 448          for (Version **I = VList; *I != 0 && Bad == true; I++)
 449          {
 450             VerIterator Ver(Cache,*I);
 451             PkgIterator Pkg = Ver.ParentPkg();
 452
 453             // See if the current version is ok
 454             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 455                 Pkg.State() == PkgIterator::NeedsNothing)
 456             {
 457                Bad = false;
 458                continue;
 459             }
 460          }
 461
 462          // Look for something that could be configured.
 463          for (Version **I = VList; *I != 0 && Bad == true; I++)
 464          {
 465             VerIterator Ver(Cache,*I);
 466             PkgIterator Pkg = Ver.ParentPkg();
 467
 468             // Not the install version
 469             if (Cache[Pkg].InstallVer != *I ||
 470                 (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 471                continue;
 472
 473             Bad = !SmartConfigure(Pkg);
 474          }
 475
 476          delete [] VList;
 477
 478          /* If this or element did not match then continue on to the
 479             next or element until a matching element is found*/
 480          if (Bad == true)
 481          {
 482             if (Start == End)
 483                return _error->Error("Internal Error, Couldn't configure a pre-depend");
 484             Start++;
 485          }
 486          else
 487             break;
 488       }
 489
 490       if (End->Type == pkgCache::Dep::Conflicts)
 491       {
 492          /* Look for conflicts. Two packages that are both in the install
 493             state cannot conflict so we don't check.. */
 494          Version **VList = End.AllTargets();
 495          for (Version **I = VList; *I != 0; I++)
 496          {
 497             VerIterator Ver(Cache,*I);
 498             PkgIterator Pkg = Ver.ParentPkg();
 499
 500             // See if the current version is conflicting
 501             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true)
 502             {
 503                if (EarlyRemove(Pkg) == false)
 504                   return _error->Error("Internal Error, Could not early remove %s",Pkg.Name());
 505             }
 506          }
 507          delete [] VList;
 508       }
 509    }
 510
 511    // Check for reverse conflicts.
 512    if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
 513                    Cache[Pkg].InstVerIter(Cache).VerStr()) == false)
 514       return false;
 515
 516    for (PrvIterator P = Cache[Pkg].InstVerIter(Cache).ProvidesList();
 517         P.end() == false; P++)
 518       CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());
 519
 520    if (Install(Pkg,FileNames[Pkg->ID]) == false)
 521       return false;
 522
 523    List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 524
 525    // Perform immedate configuration of the package.
 526    if (List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
 527       if (SmartConfigure(Pkg) == false)
 528          return _error->Error("Internal Error, Could not perform immediate configuration");
 529
 530    return true;
 531 }
 532                                                                         /*}}}*/
 533 // PM::OrderInstall - Installation ordering routine                     /*{{{*/
 534 // ---------------------------------------------------------------------
 535 /* */
 536 pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
 537 {
 538    if (CreateOrderList() == false)
 539       return Failed;
 540
 541    Reset();
 542
 543    if (Debug == true)
 544       clog << "Begining to order" << endl;
 545
 546    if (List->OrderUnpack(FileNames) == false)
 547    {
 548       _error->Error("Internal ordering error");
 549       return Failed;
 550    }
 551
 552    if (Debug == true)
 553       clog << "Done ordering" << endl;
 554
 555    bool DoneSomething = false;
 556    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 557    {
 558       PkgIterator Pkg(Cache,*I);
 559
 560       if (List->IsNow(Pkg) == false)
 561       {
 562          if (Debug == true)
 563             clog << "Skipping already done " << Pkg.Name() << endl;
 564          continue;
 565       }
 566
 567       if (List->IsMissing(Pkg) == true)
 568       {
 569          if (Debug == true)
 570             clog << "Sequence completed at " << Pkg.Name() << endl;
 571          if (DoneSomething == false)
 572          {
 573             _error->Error("Internal Error, ordering was unable to handle the media swap");
 574             return Failed;
 575          }
 576          return Incomplete;
 577       }
 578
 579       // Sanity check
 580       if (Cache[Pkg].Keep() == true &&
 581           Pkg.State() == pkgCache::PkgIterator::NeedsNothing &&
 582           (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall)
 583       {
 584          _error->Error("Internal Error, trying to manipulate a kept package");
 585          return Failed;
 586       }
 587
 588       // Perform a delete or an install
 589       if (Cache[Pkg].Delete() == true)
 590       {
 591          if (SmartRemove(Pkg) == false)
 592             return Failed;
 593       }
 594       else
 595          if (SmartUnPack(Pkg) == false)
 596             return Failed;
 597       DoneSomething = true;
 598    }
 599
 600    // Final run through the configure phase
 601    if (ConfigureAll() == false)
 602       return Failed;
 603
 604    // Sanity check
 605    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 606    {
 607       if (List->IsFlag(*I,pkgOrderList::Configured) == false)
 608       {
 609          _error->Error("Internal error, packages left unconfigured. %s",
 610                        PkgIterator(Cache,*I).Name());
 611          return Failed;
 612       }
 613    }
 614
 615    return Completed;
 616 }
 617                                                                         /*}}}*/
 618 // PM::DoInstall - Does the installation                                /*{{{*/
 619 // ---------------------------------------------------------------------
 620 /* This uses the filenames in FileNames and the information in the
 621    DepCache to perform the installation of packages.*/
 622 pkgPackageManager::OrderResult pkgPackageManager::DoInstall()
 623 {
 624    OrderResult Res = OrderInstall();
 625    if (Res != Failed)
 626       if (Go() == false)
 627          return Failed;
 628    return Res;
 629 }
 630                                                                         /*}}}*/