apt-pkg/packagemanager.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: packagemanager.cc,v 1.8 1998/11/23 07:03:01 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
  64       // Skip packages to erase
  65       if (Cache[Pkg].Delete() == true)
  66          continue;
  67
  68       // Skip Packages that need configure only.
  69       if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure)
  70          continue;
  71
  72       new pkgAcqArchive(Owner,Sources,Recs,Cache[Pkg].InstVerIter(Cache),
  73                         FileNames[Pkg->ID]);
  74    }
  75
  76    return true;
  77 }
  78                                                                         /*}}}*/
  79 // PM::FixMissing - Keep all missing packages                           /*{{{*/
  80 // ---------------------------------------------------------------------
  81 /* This is called to correct the installation when packages could not
  82    be downloaded. */
  83 bool pkgPackageManager::FixMissing()
  84 {
  85    pkgProblemResolver Resolve(Cache);
  86
  87    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
  88    {
  89      if (Cache[I].Keep() == true)
  90          continue;
  91       if (FileNames[I->ID].empty() == false || Cache[I].Delete() == true)
  92          continue;
  93       Cache.MarkKeep(I);
  94    }
  95
  96    // Now downgrade everything that is broken
  97    return Resolve.ResolveByKeep() == true && Cache.BrokenCount() == 0;
  98 }
  99                                                                         /*}}}*/
 100
 101 // PM::CreateOrderList - Create the ordering class                      /*{{{*/
 102 // ---------------------------------------------------------------------
 103 /* This populates the ordering list with all the packages that are
 104    going to change. */
 105 bool pkgPackageManager::CreateOrderList()
 106 {
 107    delete List;
 108    List = new pkgOrderList(Cache);
 109
 110    // Generate the list of affected packages and sort it
 111    for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
 112    {
 113       // Mark the package for immediate configuration
 114       if ((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
 115       {
 116          List->Flag(I,pkgOrderList::Immediate);
 117
 118          // Look for other packages to make immediate configurea
 119          if (Cache[I].InstallVer != 0)
 120             for (DepIterator D = Cache[I].InstVerIter(Cache).DependsList();
 121                  D.end() == false; D++)
 122                if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 123                   List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
 124
 125          // And again with the current version.
 126          if (I->CurrentVer != 0)
 127             for (DepIterator D = I.CurrentVer().DependsList();
 128                  D.end() == false; D++)
 129                if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
 130                   List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
 131       }
 132
 133       // Not interesting
 134       if ((Cache[I].Keep() == true ||
 135           Cache[I].InstVerIter(Cache) == I.CurrentVer()) &&
 136           I.State() == pkgCache::PkgIterator::NeedsNothing)
 137          continue;
 138
 139       // Append it to the list
 140       List->push_back(I);
 141
 142       if ((I->Flags & pkgCache::Flag::ImmediateConf) == pkgCache::Flag::ImmediateConf)
 143          List->Flag(I,pkgOrderList::Immediate);
 144    }
 145
 146    return true;
 147 }
 148                                                                         /*}}}*/
 149 // PM::DepAlwaysTrue - Returns true if this dep is irrelevent           /*{{{*/
 150 // ---------------------------------------------------------------------
 151 /* The restriction on provides is to eliminate the case when provides
 152    are transitioning between valid states [ie exim to smail] */
 153 bool pkgPackageManager::DepAlwaysTrue(DepIterator D)
 154 {
 155    if (D.TargetPkg()->ProvidesList != 0)
 156       return false;
 157
 158    if ((Cache[D] & pkgDepCache::DepInstall) != 0 &&
 159        (Cache[D] & pkgDepCache::DepNow) != 0)
 160       return true;
 161    return false;
 162 }
 163                                                                         /*}}}*/
 164 // PM::CheckRConflicts - Look for reverse conflicts                     /*{{{*/
 165 // ---------------------------------------------------------------------
 166 /* This looks over the reverses for a conflicts line that needs early
 167    removal. */
 168 bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
 169                                         const char *Ver)
 170 {
 171    for (;D.end() == false; D++)
 172    {
 173       if (D->Type != pkgCache::Dep::Conflicts)
 174          continue;
 175
 176       if (D.ParentPkg() == Pkg)
 177          continue;
 178
 179       if (pkgCheckDep(D.TargetVer(),Ver,D->CompareOp) == false)
 180          continue;
 181
 182       if (List->IsNow(Pkg) == false)
 183          continue;
 184
 185       if (EarlyRemove(D.ParentPkg()) == false)
 186          return false;
 187    }
 188    return true;
 189 }
 190                                                                         /*}}}*/
 191 // PM::ConfigureAll - Run the all out configuration                     /*{{{*/
 192 // ---------------------------------------------------------------------
 193 /* This configures every package. It is assumed they are all unpacked and
 194    that the final configuration is valid. */
 195 bool pkgPackageManager::ConfigureAll()
 196 {
 197    pkgOrderList OList(Cache);
 198
 199    // Populate the order list
 200    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 201       if (List->IsFlag(pkgCache::PkgIterator(Cache,*I),
 202                        pkgOrderList::UnPacked) == true)
 203          OList.push_back(*I);
 204
 205    if (OList.OrderConfigure() == false)
 206       return false;
 207
 208    // Perform the configuring
 209    for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
 210    {
 211       PkgIterator Pkg(Cache,*I);
 212
 213       if (Configure(Pkg) == false)
 214          return false;
 215
 216       List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 217    }
 218
 219    return true;
 220 }
 221                                                                         /*}}}*/
 222 // PM::SmartConfigure - Perform immediate configuration of the pkg      /*{{{*/
 223 // ---------------------------------------------------------------------
 224 /* This routine scheduals the configuration of the given package and all
 225    of it's dependents. */
 226 bool pkgPackageManager::SmartConfigure(PkgIterator Pkg)
 227 {
 228    pkgOrderList OList(Cache);
 229
 230    if (DepAdd(OList,Pkg) == false)
 231       return false;
 232
 233    if (OList.OrderConfigure() == false)
 234       return false;
 235
 236    // Perform the configuring
 237    for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
 238    {
 239       PkgIterator Pkg(Cache,*I);
 240
 241       if (Configure(Pkg) == false)
 242          return false;
 243
 244       List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 245    }
 246
 247    // Sanity Check
 248    if (List->IsFlag(Pkg,pkgOrderList::Configured) == false)
 249       return _error->Error("Internal error, could not immediate configure %s",Pkg.Name());
 250
 251    return true;
 252 }
 253                                                                         /*}}}*/
 254 // PM::DepAdd - Add all dependents to the oder list                     /*{{{*/
 255 // ---------------------------------------------------------------------
 256 /* This recursively adds all dependents to the order list */
 257 bool pkgPackageManager::DepAdd(pkgOrderList &OList,PkgIterator Pkg,int Depth)
 258 {
 259    if (OList.IsFlag(Pkg,pkgOrderList::Added) == true)
 260       return true;
 261    if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
 262       return true;
 263    if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == false)
 264       return false;
 265
 266
 267    // Put the package on the list
 268    OList.push_back(Pkg);
 269    OList.Flag(Pkg,pkgOrderList::Added);
 270    Depth++;
 271
 272    // Check the dependencies to see if they are all satisfied.
 273    bool Bad = false;
 274    for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); D.end() == false;)
 275    {
 276       if (D->Type != pkgCache::Dep::Depends && D->Type != pkgCache::Dep::PreDepends)
 277       {
 278          D++;
 279          continue;
 280       }
 281
 282       // Grok or groups
 283       Bad = true;
 284       for (bool LastOR = true; D.end() == false && LastOR == true; D++)
 285       {
 286          LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
 287
 288          if (Bad == false)
 289             continue;
 290
 291          Version **VList = D.AllTargets();
 292          for (Version **I = VList; *I != 0 && Bad == true; I++)
 293          {
 294             VerIterator Ver(Cache,*I);
 295             PkgIterator Pkg = Ver.ParentPkg();
 296
 297             // See if the current version is ok
 298             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 299                 Pkg.State() == PkgIterator::NeedsNothing)
 300             {
 301                Bad = false;
 302                continue;
 303             }
 304
 305             // Not the install version
 306             if (Cache[Pkg].InstallVer != *I ||
 307                 (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 308                continue;
 309             if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == true)
 310                Bad = !DepAdd(OList,Pkg,Depth);
 311             if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
 312                Bad = false;
 313          }
 314          delete [] VList;
 315       }
 316
 317       if (Bad == true)
 318       {
 319          OList.Flag(Pkg,0,pkgOrderList::Added);
 320          OList.pop_back();
 321          Depth--;
 322          return false;
 323       }
 324    }
 325
 326    Depth--;
 327    return true;
 328 }
 329                                                                         /*}}}*/
 330 // PM::EarlyRemove - Perform removal of packages before their time      /*{{{*/
 331 // ---------------------------------------------------------------------
 332 /* This is called to deal with conflicts arising from unpacking */
 333 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
 334 {
 335    if (List->IsNow(Pkg) == false)
 336       return true;
 337
 338    // Already removed it
 339    if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
 340       return true;
 341
 342    // Woops, it will not be re-installed!
 343    if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
 344       return false;
 345
 346    bool Res = SmartRemove(Pkg);
 347    if (Cache[Pkg].Delete() == false)
 348       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
 349
 350    return Res;
 351 }
 352                                                                         /*}}}*/
 353 // PM::SmartRemove - Removal Helper                                     /*{{{*/
 354 // ---------------------------------------------------------------------
 355 /* */
 356 bool pkgPackageManager::SmartRemove(PkgIterator Pkg)
 357 {
 358    if (List->IsNow(Pkg) == false)
 359       return true;
 360
 361    List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
 362    return Remove(Pkg);
 363 }
 364                                                                         /*}}}*/
 365 // PM::SmartUnPack - Install helper                                     /*{{{*/
 366 // ---------------------------------------------------------------------
 367 /* This performs the task of handling pre-depends. */
 368 bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
 369 {
 370    // Check if it is already unpacked
 371    if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
 372        Cache[Pkg].Keep() == true)
 373    {
 374       List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 375       if (List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
 376          if (SmartConfigure(Pkg) == false)
 377             return _error->Error("Internal Error, Could not perform immediate configuraton");
 378       return true;
 379    }
 380
 381    /* See if this packages install version has any predependencies
 382       that are not met by 'now' packages. */
 383    for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList();
 384         D.end() == false; D++)
 385    {
 386       if (D->Type == pkgCache::Dep::PreDepends)
 387       {
 388          // Look for possible ok targets.
 389          Version **VList = D.AllTargets();
 390          bool Bad = true;
 391          for (Version **I = VList; *I != 0 && Bad == true; I++)
 392          {
 393             VerIterator Ver(Cache,*I);
 394             PkgIterator Pkg = Ver.ParentPkg();
 395
 396             // See if the current version is ok
 397             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true &&
 398                 Pkg.State() == PkgIterator::NeedsNothing)
 399             {
 400                Bad = false;
 401                continue;
 402             }
 403          }
 404
 405          // Look for something that could be configured.
 406          for (Version **I = VList; *I != 0 && Bad == true; I++)
 407          {
 408             VerIterator Ver(Cache,*I);
 409             PkgIterator Pkg = Ver.ParentPkg();
 410
 411             // Not the install version
 412             if (Cache[Pkg].InstallVer != *I ||
 413                 (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
 414                continue;
 415
 416             Bad = !SmartConfigure(Pkg);
 417          }
 418
 419          delete [] VList;
 420
 421          if (Bad == true)
 422             return _error->Error("Internal Error, Couldn't configure a pre-depend");
 423
 424          continue;
 425       }
 426
 427       if (D->Type == pkgCache::Dep::Conflicts)
 428       {
 429          /* Look for conflicts. Two packages that are both in the install
 430             state cannot conflict so we don't check.. */
 431          Version **VList = D.AllTargets();
 432          for (Version **I = VList; *I != 0; I++)
 433          {
 434             VerIterator Ver(Cache,*I);
 435             PkgIterator Pkg = Ver.ParentPkg();
 436
 437             // See if the current version is conflicting
 438             if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true)
 439             {
 440                if (EarlyRemove(Pkg) == false)
 441                   return _error->Error("Internal Error, Could not early remove %s",Pkg.Name());
 442             }
 443          }
 444          delete [] VList;
 445       }
 446    }
 447
 448    // Check for reverse conflicts.
 449    CheckRConflicts(Pkg,Pkg.RevDependsList(),
 450                    Cache[Pkg].InstVerIter(Cache).VerStr());
 451    for (PrvIterator P = Cache[Pkg].InstVerIter(Cache).ProvidesList();
 452         P.end() == false; P++)
 453       CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());
 454
 455    if (Install(Pkg,FileNames[Pkg->ID]) == false)
 456       return false;
 457
 458    List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
 459
 460    // Perform immedate configuration of the package.
 461    if (List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
 462       if (SmartConfigure(Pkg) == false)
 463          return _error->Error("Internal Error, Could not perform immediate configuraton");
 464
 465    return true;
 466 }
 467                                                                         /*}}}*/
 468 // PM::OrderInstall - Installation ordering routine                     /*{{{*/
 469 // ---------------------------------------------------------------------
 470 /* */
 471 bool pkgPackageManager::OrderInstall()
 472 {
 473    if (CreateOrderList() == false)
 474       return false;
 475
 476    if (Debug == true)
 477       clog << "Begining to order" << endl;
 478
 479    if (List->OrderUnpack() == false)
 480       return _error->Error("Internal ordering error");
 481
 482    if (Debug == true)
 483       clog << "Done ordering" << endl;
 484
 485    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 486    {
 487       PkgIterator Pkg(Cache,*I);
 488
 489       // Sanity check
 490       if (Cache[Pkg].Keep() == true && Pkg.State() == pkgCache::PkgIterator::NeedsNothing)
 491          return _error->Error("Internal Error, trying to manipulate a kept package");
 492
 493       // Perform a delete or an install
 494       if (Cache[Pkg].Delete() == true)
 495       {
 496          if (SmartRemove(Pkg) == false)
 497             return false;
 498       }
 499       else
 500          if (SmartUnPack(Pkg) == false)
 501             return false;
 502    }
 503
 504    // Final run through the configure phase
 505    if (ConfigureAll() == false)
 506       return false;
 507
 508    // Sanity check
 509    for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
 510       if (List->IsFlag(*I,pkgOrderList::Configured) == false)
 511          return _error->Error("Internal error, packages left unconfigured. %s",
 512                               PkgIterator(Cache,*I).Name());
 513
 514    return true;
 515 }
 516                                                                         /*}}}*/
 517 // PM::DoInstall - Does the installation                                /*{{{*/
 518 // ---------------------------------------------------------------------
 519 /* This uses the filenames in FileNames and the information in the
 520    DepCache to perform the installation of packages.*/
 521 bool pkgPackageManager::DoInstall()
 522 {
 523    return OrderInstall() && Go();
 524 }
 525                                                                         /*}}}*/