apt-pkg/pkgcachegen.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgcachegen.cc,v 1.23 1998/11/13 04:23:33 jgg Exp $
   4 /* ######################################################################
   5
   6    Package Cache Generator - Generator for the cache structure.
   7
   8    This builds the cache structure from the abstract package list parser.
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #ifdef __GNUG__
  14 #pragma implementation "apt-pkg/pkgcachegen.h"
  15 #endif
  16
  17 #include <apt-pkg/pkgcachegen.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/version.h>
  20 #include <apt-pkg/progress.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/configuration.h>
  23 #include <apt-pkg/deblistparser.h>
  24
  25 #include <strutl.h>
  26
  27 #include <sys/stat.h>
  28 #include <unistd.h>
  29                                                                         /*}}}*/
  30
  31 // CacheGenerator::pkgCacheGenerator - Constructor                      /*{{{*/
  32 // ---------------------------------------------------------------------
  33 /* We set the diry flag and make sure that is written to the disk */
  34 pkgCacheGenerator::pkgCacheGenerator(DynamicMMap &Map,OpProgress &Prog) :
  35                     Map(Map), Cache(Map), Progress(Prog)
  36 {
  37    if (_error->PendingError() == true)
  38       return;
  39
  40    if (Map.Size() == 0)
  41    {
  42       Map.RawAllocate(sizeof(pkgCache::Header));
  43       *Cache.HeaderP = pkgCache::Header();
  44    }
  45    Cache.HeaderP->Dirty = true;
  46    Map.Sync(0,sizeof(pkgCache::Header));
  47    Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));
  48 }
  49                                                                         /*}}}*/
  50 // CacheGenerator::~pkgCacheGenerator - Destructor                      /*{{{*/
  51 // ---------------------------------------------------------------------
  52 /* We sync the data then unset the dirty flag in two steps so as to
  53    advoid a problem during a crash */
  54 pkgCacheGenerator::~pkgCacheGenerator()
  55 {
  56    if (_error->PendingError() == true)
  57       return;
  58    if (Map.Sync() == false)
  59       return;
  60
  61    Cache.HeaderP->Dirty = false;
  62    Map.Sync(0,sizeof(pkgCache::Header));
  63 }
  64                                                                         /*}}}*/
  65 // CacheGenerator::MergeList - Merge the package list                   /*{{{*/
  66 // ---------------------------------------------------------------------
  67 /* This provides the generation of the entries in the cache. Each loop
  68    goes through a single package record from the underlying parse engine. */
  69 bool pkgCacheGenerator::MergeList(ListParser &List)
  70 {
  71    List.Owner = this;
  72
  73    int Counter = 0;
  74    while (List.Step() == true)
  75    {
  76       // Get a pointer to the package structure
  77       string PackageName = List.Package();
  78       pkgCache::PkgIterator Pkg;
  79       if (NewPackage(Pkg,PackageName) == false)
  80          return _error->Error("Error occured while processing %s (NewPackage)",PackageName.c_str());
  81       Counter++;
  82       if (Counter % 100 == 0)
  83          Progress.Progress(List.Offset());
  84
  85       /* Get a pointer to the version structure. We know the list is sorted
  86          so we use that fact in the search. Insertion of new versions is
  87          done with correct sorting */
  88       string Version = List.Version();
  89       if (Version.empty() == true)
  90       {
  91          if (List.UsePackage(Pkg,pkgCache::VerIterator(Cache)) == false)
  92             return _error->Error("Error occured while processing %s (UsePackage1)",PackageName.c_str());
  93          continue;
  94       }
  95
  96       pkgCache::VerIterator Ver = Pkg.VersionList();
  97       __apt_ptrloc *Last = &Pkg->VersionList;
  98       int Res = 1;
  99       for (; Ver.end() == false; Last = &Ver->NextVer, Ver++)
 100       {
 101          Res = pkgVersionCompare(Version.begin(),Version.end(),Ver.VerStr(),
 102                                  Ver.VerStr() + strlen(Ver.VerStr()));
 103          if (Res >= 0)
 104             break;
 105       }
 106
 107       /* We already have a version for this item, record that we
 108          saw it */
 109       if (Res == 0)
 110       {
 111          if (List.UsePackage(Pkg,Ver) == false)
 112             return _error->Error("Error occured while processing %s (UsePackage2)",PackageName.c_str());
 113
 114          if (NewFileVer(Ver,List) == false)
 115             return _error->Error("Error occured while processing %s (NewFileVer1)",PackageName.c_str());
 116
 117          continue;
 118       }
 119
 120       // Add a new version
 121       *Last = NewVersion(Ver,Version,*Last);
 122       Ver->ParentPkg = Pkg.Index();
 123       if (List.NewVersion(Ver) == false)
 124          return _error->Error("Error occured while processing %s (NewVersion1)",PackageName.c_str());
 125
 126       if (List.UsePackage(Pkg,Ver) == false)
 127          return _error->Error("Error occured while processing %s (UsePackage3)",PackageName.c_str());
 128
 129       if (NewFileVer(Ver,List) == false)
 130          return _error->Error("Error occured while processing %s (NewVersion2)",PackageName.c_str());
 131    }
 132
 133    return true;
 134 }
 135                                                                         /*}}}*/
 136 // CacheGenerator::NewPackage - Add a new package                       /*{{{*/
 137 // ---------------------------------------------------------------------
 138 /* This creates a new package structure and adds it to the hash table */
 139 bool pkgCacheGenerator::NewPackage(pkgCache::PkgIterator &Pkg,string Name)
 140 {
 141    Pkg = Cache.FindPkg(Name);
 142    if (Pkg.end() == false)
 143       return true;
 144
 145    // Get a structure
 146    unsigned long Package = Map.Allocate(sizeof(pkgCache::Package));
 147    if (Package == 0)
 148       return false;
 149
 150    Pkg = pkgCache::PkgIterator(Cache,Cache.PkgP + Package);
 151
 152    // Insert it into the hash table
 153    unsigned long Hash = Cache.Hash(Name);
 154    Pkg->NextPackage = Cache.HeaderP->HashTable[Hash];
 155    Cache.HeaderP->HashTable[Hash] = Package;
 156
 157    // Set the name and the ID
 158    Pkg->Name = Map.WriteString(Name);
 159    if (Pkg->Name == 0)
 160       return false;
 161    Pkg->ID = Cache.HeaderP->PackageCount++;
 162
 163    return true;
 164 }
 165                                                                         /*}}}*/
 166 // CacheGenerator::NewFileVer - Create a new File<->Version association /*{{{*/
 167 // ---------------------------------------------------------------------
 168 /* */
 169 bool pkgCacheGenerator::NewFileVer(pkgCache::VerIterator &Ver,
 170                                    ListParser &List)
 171 {
 172    // Get a structure
 173    unsigned long VerFile = Map.Allocate(sizeof(pkgCache::VerFile));
 174    if (VerFile == 0)
 175       return 0;
 176
 177    pkgCache::VerFileIterator VF(Cache,Cache.VerFileP + VerFile);
 178    VF->File = CurrentFile - Cache.PkgFileP;
 179
 180    // Link it to the end of the list
 181    __apt_ptrloc *Last = &Ver->FileList;
 182    for (pkgCache::VerFileIterator V = Ver.FileList(); V.end() == false; V++)
 183       Last = &V->NextFile;
 184    VF->NextFile = *Last;
 185    *Last = VF.Index();
 186
 187    VF->Offset = List.Offset();
 188    VF->Size = List.Size();
 189    if (Cache.HeaderP->MaxVerFileSize < VF->Size)
 190       Cache.HeaderP->MaxVerFileSize = VF->Size;
 191    return true;
 192 }
 193                                                                         /*}}}*/
 194 // CacheGenerator::NewVersion - Create a new Version                    /*{{{*/
 195 // ---------------------------------------------------------------------
 196 /* This puts a version structure in the linked list */
 197 unsigned long pkgCacheGenerator::NewVersion(pkgCache::VerIterator &Ver,
 198                                             string VerStr,
 199                                             unsigned long Next)
 200 {
 201    // Get a structure
 202    unsigned long Version = Map.Allocate(sizeof(pkgCache::Version));
 203    if (Version == 0)
 204       return 0;
 205
 206    // Fill it in
 207    Ver = pkgCache::VerIterator(Cache,Cache.VerP + Version);
 208    Ver->NextVer = Next;
 209    Ver->ID = Cache.HeaderP->VersionCount++;
 210    Ver->VerStr = Map.WriteString(VerStr);
 211    if (Ver->VerStr == 0)
 212       return 0;
 213
 214    return Version;
 215 }
 216                                                                         /*}}}*/
 217 // ListParser::NewDepends - Create a dependency element                 /*{{{*/
 218 // ---------------------------------------------------------------------
 219 /* This creates a dependency element in the tree. It is linked to the
 220    version and to the package that it is pointing to. */
 221 bool pkgCacheGenerator::ListParser::NewDepends(pkgCache::VerIterator Ver,
 222                                                string PackageName,
 223                                                string Version,
 224                                                unsigned int Op,
 225                                                unsigned int Type)
 226 {
 227    pkgCache &Cache = Owner->Cache;
 228
 229    // Get a structure
 230    unsigned long Dependency = Owner->Map.Allocate(sizeof(pkgCache::Dependency));
 231    if (Dependency == 0)
 232       return false;
 233
 234    // Fill it in
 235    pkgCache::DepIterator Dep(Cache,Cache.DepP + Dependency);
 236    Dep->ParentVer = Ver.Index();
 237    Dep->Type = Type;
 238    Dep->CompareOp = Op;
 239    Dep->ID = Cache.HeaderP->DependsCount++;
 240
 241    // Locate the target package
 242    pkgCache::PkgIterator Pkg;
 243    if (Owner->NewPackage(Pkg,PackageName) == false)
 244       return false;
 245
 246    // Probe the reverse dependency list for a version string that matches
 247    if (Version.empty() == false)
 248    {
 249       for (pkgCache::DepIterator I = Pkg.RevDependsList(); I.end() == false; I++)
 250          if (I->Version != 0 && I.TargetVer() == Version)
 251             Dep->Version = I->Version;
 252       if (Dep->Version == 0)
 253          if ((Dep->Version = WriteString(Version)) == 0)
 254             return false;
 255    }
 256
 257    // Link it to the package
 258    Dep->Package = Pkg.Index();
 259    Dep->NextRevDepends = Pkg->RevDepends;
 260    Pkg->RevDepends = Dep.Index();
 261
 262    // Link it to the version (at the end of the list)
 263    __apt_ptrloc *Last = &Ver->DependsList;
 264    for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false; D++)
 265       Last = &D->NextDepends;
 266    Dep->NextDepends = *Last;
 267    *Last = Dep.Index();
 268
 269    return true;
 270 }
 271                                                                         /*}}}*/
 272 // ListParser::NewProvides - Create a Provides element                  /*{{{*/
 273 // ---------------------------------------------------------------------
 274 /* */
 275 bool pkgCacheGenerator::ListParser::NewProvides(pkgCache::VerIterator Ver,
 276                                                 string PackageName,
 277                                                 string Version)
 278 {
 279    pkgCache &Cache = Owner->Cache;
 280
 281    // We do not add self referencing provides
 282    if (Ver.ParentPkg().Name() == PackageName)
 283       return true;
 284
 285    // Get a structure
 286    unsigned long Provides = Owner->Map.Allocate(sizeof(pkgCache::Provides));
 287    if (Provides == 0)
 288       return false;
 289
 290    // Fill it in
 291    pkgCache::PrvIterator Prv(Cache,Cache.ProvideP + Provides,Cache.PkgP);
 292    Prv->Version = Ver.Index();
 293    Prv->NextPkgProv = Ver->ProvidesList;
 294    Ver->ProvidesList = Prv.Index();
 295    if (Version.empty() == false && (Prv->Version = WriteString(Version)) == 0)
 296       return false;
 297
 298    // Locate the target package
 299    pkgCache::PkgIterator Pkg;
 300    if (Owner->NewPackage(Pkg,PackageName) == false)
 301       return false;
 302
 303    // Link it to the package
 304    Prv->ParentPkg = Pkg.Index();
 305    Prv->NextProvides = Pkg->ProvidesList;
 306    Pkg->ProvidesList = Prv.Index();
 307
 308    return true;
 309 }
 310                                                                         /*}}}*/
 311 // CacheGenerator::SelectFile - Select the current file being parsed    /*{{{*/
 312 // ---------------------------------------------------------------------
 313 /* This is used to select which file is to be associated with all newly
 314    added versions. */
 315 bool pkgCacheGenerator::SelectFile(string File,unsigned long Flags)
 316 {
 317    struct stat Buf;
 318    if (stat(File.c_str(),&Buf) == -1)
 319       return _error->Errno("stat","Couldn't stat ",File.c_str());
 320
 321    // Get some space for the structure
 322    CurrentFile = Cache.PkgFileP + Map.Allocate(sizeof(*CurrentFile));
 323    if (CurrentFile == Cache.PkgFileP)
 324       return false;
 325
 326    // Fill it in
 327    CurrentFile->FileName = Map.WriteString(File);
 328    CurrentFile->Size = Buf.st_size;
 329    CurrentFile->mtime = Buf.st_mtime;
 330    CurrentFile->NextFile = Cache.HeaderP->FileList;
 331    CurrentFile->Flags = Flags;
 332    CurrentFile->ID = Cache.HeaderP->PackageFileCount;
 333    PkgFileName = File;
 334    Cache.HeaderP->FileList = CurrentFile - Cache.PkgFileP;
 335    Cache.HeaderP->PackageFileCount++;
 336
 337    if (CurrentFile->FileName == 0)
 338       return false;
 339
 340    Progress.SubProgress(Buf.st_size);
 341    return true;
 342 }
 343                                                                         /*}}}*/
 344 // CacheGenerator::WriteUniqueString - Insert a unique string           /*{{{*/
 345 // ---------------------------------------------------------------------
 346 /* This is used to create handles to strings. Given the same text it
 347    always returns the same number */
 348 unsigned long pkgCacheGenerator::WriteUniqString(const char *S,
 349                                                  unsigned int Size)
 350 {
 351    // Search for an insertion point
 352    pkgCache::StringItem *I = Cache.StringItemP + Cache.HeaderP->StringList;
 353    int Res = 1;
 354    __apt_ptrloc *Last = &Cache.HeaderP->StringList;
 355    for (; I != Cache.StringItemP; Last = &I->NextItem,
 356         I = Cache.StringItemP + I->NextItem)
 357    {
 358       Res = stringcmp(S,S+Size,Cache.StrP + I->String);
 359       if (Res >= 0)
 360          break;
 361    }
 362
 363    // Match
 364    if (Res == 0)
 365       return I->String;
 366
 367    // Get a structure
 368    unsigned long Item = Map.Allocate(sizeof(pkgCache::StringItem));
 369    if (Item == 0)
 370       return 0;
 371
 372    // Fill in the structure
 373    pkgCache::StringItem *ItemP = Cache.StringItemP + Item;
 374    ItemP->NextItem = I - Cache.StringItemP;
 375    *Last = Item;
 376    ItemP->String = Map.WriteString(S,Size);
 377    if (ItemP->String == 0)
 378       return 0;
 379
 380    return ItemP->String;
 381 }
 382                                                                         /*}}}*/
 383
 384 // SrcCacheCheck - Check if the source package cache is uptodate        /*{{{*/
 385 // ---------------------------------------------------------------------
 386 /* The source cache is checked against the source list and the files
 387    on disk, any difference results in a false. */
 388 bool pkgSrcCacheCheck(pkgSourceList &List)
 389 {
 390    if (_error->PendingError() == true)
 391       return false;
 392
 393    string CacheFile = _config->FindFile("Dir::Cache::srcpkgcache");
 394    string ListDir = _config->FindDir("Dir::State::lists");
 395
 396    // Count the number of missing files
 397    int Missing = 0;
 398    for (pkgSourceList::const_iterator I = List.begin(); I != List.end(); I++)
 399    {
 400       string File = ListDir + URItoFileName(I->PackagesURI());
 401       struct stat Buf;
 402       if (stat(File.c_str(),&Buf) != 0)
 403       {
 404          _error->WarningE("stat","Couldn't stat source package list '%s' (%s)",
 405                           I->PackagesInfo().c_str(),File.c_str());
 406          Missing++;
 407       }
 408    }
 409
 410    // Open the source package cache
 411    if (FileExists(CacheFile) == false)
 412       return false;
 413
 414    FileFd CacheF(CacheFile,FileFd::ReadOnly);
 415    if (_error->PendingError() == true)
 416    {
 417       _error->Discard();
 418       return false;
 419    }
 420
 421    MMap Map(CacheF,MMap::Public | MMap::ReadOnly);
 422    if (_error->PendingError() == true || Map.Size() == 0)
 423    {
 424       _error->Discard();
 425       return false;
 426    }
 427
 428    pkgCache Cache(Map);
 429    if (_error->PendingError() == true)
 430    {
 431       _error->Discard();
 432       return false;
 433    }
 434
 435    // They are certianly out of sync
 436    if (Cache.Head().PackageFileCount != List.size() - Missing)
 437       return false;
 438
 439    for (pkgCache::PkgFileIterator F(Cache); F.end() == false; F++)
 440    {
 441       // Search for a match in the source list
 442       bool Bad = true;
 443       for (pkgSourceList::const_iterator I = List.begin();
 444            I != List.end(); I++)
 445       {
 446          string File = ListDir + URItoFileName(I->PackagesURI());
 447          if (F.FileName() == File)
 448          {
 449             Bad = false;
 450             break;
 451          }
 452       }
 453
 454       // Check if the file matches what was cached
 455       Bad |= !F.IsOk();
 456       if (Bad == true)
 457          return false;
 458    }
 459
 460    return true;
 461 }
 462                                                                         /*}}}*/
 463 // PkgCacheCheck - Check if the package cache is uptodate               /*{{{*/
 464 // ---------------------------------------------------------------------
 465 /* This does a simple check of all files used to compose the cache */
 466 bool pkgPkgCacheCheck(string CacheFile)
 467 {
 468    if (_error->PendingError() == true)
 469       return false;
 470
 471    // Open the source package cache
 472    if (FileExists(CacheFile) == false)
 473       return false;
 474
 475    FileFd CacheF(CacheFile,FileFd::ReadOnly);
 476    if (_error->PendingError() == true)
 477    {
 478       _error->Discard();
 479       return false;
 480    }
 481
 482    MMap Map(CacheF,MMap::Public | MMap::ReadOnly);
 483    if (_error->PendingError() == true || Map.Size() == 0)
 484    {
 485       _error->Discard();
 486       return false;
 487    }
 488
 489    pkgCache Cache(Map);
 490    if (_error->PendingError() == true)
 491    {
 492       _error->Discard();
 493       return false;
 494    }
 495
 496    // Status files that must be in the cache
 497    string Status[3];
 498    Status[0] = _config->FindFile("Dir::State::xstatus");
 499    Status[1]= _config->FindFile("Dir::State::userstatus");
 500    Status[2] = _config->FindFile("Dir::State::status");
 501
 502    // Cheack each file
 503    for (pkgCache::PkgFileIterator F(Cache); F.end() == false; F++)
 504    {
 505       if (F.IsOk() == false)
 506          return false;
 507
 508       // See if this is one of the status files
 509       for (int I = 0; I != 3; I++)
 510          if (F.FileName() == Status[I])
 511             Status[I] = string();
 512    }
 513
 514    // Make sure all the status files are loaded.
 515    for (int I = 0; I != 3; I++)
 516    {
 517       if (Status[I].empty() == false && FileExists(Status[I]) == true)
 518          return false;
 519    }
 520
 521    return true;
 522 }
 523                                                                         /*}}}*/
 524 // AddSourcesSize - Add the size of the status files                    /*{{{*/
 525 // ---------------------------------------------------------------------
 526 /* This adds the size of all the status files to the size counter */
 527 static bool pkgAddSourcesSize(unsigned long &TotalSize)
 528 {
 529    // Grab the file names
 530    string xstatus = _config->FindFile("Dir::State::xstatus");
 531    string userstatus = _config->FindFile("Dir::State::userstatus");
 532    string status = _config->FindFile("Dir::State::status");
 533
 534    // Grab the sizes
 535    struct stat Buf;
 536    if (stat(xstatus.c_str(),&Buf) == 0)
 537       TotalSize += Buf.st_size;
 538    if (stat(userstatus.c_str(),&Buf) == 0)
 539       TotalSize += Buf.st_size;
 540    if (stat(status.c_str(),&Buf) != 0)
 541       return _error->Errno("stat","Couldn't stat the status file %s",status.c_str());
 542    TotalSize += Buf.st_size;
 543
 544    return true;
 545 }
 546                                                                         /*}}}*/
 547 // MergeStatus - Add the status files to the cache                      /*{{{*/
 548 // ---------------------------------------------------------------------
 549 /* This adds the status files to the map */
 550 static bool pkgMergeStatus(OpProgress &Progress,pkgCacheGenerator &Gen,
 551                            unsigned long &CurrentSize,unsigned long TotalSize)
 552 {
 553    // Grab the file names
 554    string Status[3];
 555    Status[0] = _config->FindFile("Dir::State::xstatus");
 556    Status[1]= _config->FindFile("Dir::State::userstatus");
 557    Status[2] = _config->FindFile("Dir::State::status");
 558
 559    for (int I = 0; I != 3; I++)
 560    {
 561       // Check if the file exists and it is not the primary status file.
 562       string File = Status[I];
 563       if (I != 2 && FileExists(File) == false)
 564          continue;
 565
 566       FileFd Pkg(File,FileFd::ReadOnly);
 567       debListParser Parser(Pkg);
 568       Progress.OverallProgress(CurrentSize,TotalSize,Pkg.Size(),"Reading Package Lists");
 569       if (_error->PendingError() == true)
 570          return _error->Error("Problem opening %s",File.c_str());
 571       CurrentSize += Pkg.Size();
 572
 573       Progress.SubProgress(0,"Local Package State - " + flNotDir(File));
 574       if (Gen.SelectFile(File,pkgCache::Flag::NotSource) == false)
 575          return _error->Error("Problem with SelectFile %s",File.c_str());
 576
 577       if (Gen.MergeList(Parser) == false)
 578          return _error->Error("Problem with MergeList %s",File.c_str());
 579       Progress.Progress(Pkg.Size());
 580    }
 581
 582    return true;
 583 }
 584                                                                         /*}}}*/
 585 // MakeStatusCache - Generates a cache that includes the status files   /*{{{*/
 586 // ---------------------------------------------------------------------
 587 /* This copies the package source cache and then merges the status and
 588    xstatus files into it. */
 589 bool pkgMakeStatusCache(pkgSourceList &List,OpProgress &Progress)
 590 {
 591    Progress.OverallProgress(0,1,1,"Reading Package Lists");
 592
 593    string CacheFile = _config->FindFile("Dir::Cache::pkgcache");
 594    bool SrcOk = pkgSrcCacheCheck(List);
 595    bool PkgOk = SrcOk && pkgPkgCacheCheck(CacheFile);
 596
 597    // Rebuild the source and package caches
 598    if (SrcOk == false)
 599    {
 600       string SCacheFile = _config->FindFile("Dir::Cache::srcpkgcache");
 601       string ListDir = _config->FindDir("Dir::State::lists");
 602       FileFd SCacheF(SCacheFile,FileFd::WriteEmpty);
 603       FileFd CacheF(CacheFile,FileFd::WriteEmpty);
 604       DynamicMMap Map(CacheF,MMap::Public);
 605       if (_error->PendingError() == true)
 606          return false;
 607
 608       pkgCacheGenerator Gen(Map,Progress);
 609
 610       // Prepare the progress indicator
 611       unsigned long TotalSize = 0;
 612       struct stat Buf;
 613       for (pkgSourceList::const_iterator I = List.begin(); I != List.end(); I++)
 614       {
 615          string File = ListDir + URItoFileName(I->PackagesURI());
 616          if (stat(File.c_str(),&Buf) != 0)
 617             continue;
 618          TotalSize += Buf.st_size;
 619       }
 620
 621       if (pkgAddSourcesSize(TotalSize) == false)
 622          return false;
 623
 624       // Generate the pkg source cache
 625       unsigned long CurrentSize = 0;
 626       for (pkgSourceList::const_iterator I = List.begin(); I != List.end(); I++)
 627       {
 628          string File = ListDir + URItoFileName(I->PackagesURI());
 629
 630          if (stat(File.c_str(),&Buf) != 0)
 631             continue;
 632
 633          FileFd Pkg(File,FileFd::ReadOnly);
 634          debListParser Parser(Pkg);
 635          Progress.OverallProgress(CurrentSize,TotalSize,Pkg.Size(),"Reading Package Lists");
 636          if (_error->PendingError() == true)
 637             return _error->Error("Problem opening %s",File.c_str());
 638          CurrentSize += Pkg.Size();
 639
 640          Progress.SubProgress(0,I->PackagesInfo());
 641          if (Gen.SelectFile(File) == false)
 642             return _error->Error("Problem with SelectFile %s",File.c_str());
 643
 644          if (Gen.MergeList(Parser) == false)
 645             return _error->Error("Problem with MergeList %s",File.c_str());
 646       }
 647
 648       // Write the src cache
 649       Gen.GetCache().HeaderP->Dirty = false;
 650       if (SCacheF.Write(Map.Data(),Map.Size()) == false)
 651          return _error->Error("IO Error saving source cache");
 652       Gen.GetCache().HeaderP->Dirty = true;
 653
 654       // Merge in the source caches
 655       return pkgMergeStatus(Progress,Gen,CurrentSize,TotalSize);
 656    }
 657
 658    if (PkgOk == true)
 659    {
 660       Progress.OverallProgress(1,1,1,"Reading Package Lists");
 661       return true;
 662    }
 663
 664    // We use the source cache to generate the package cache
 665    string SCacheFile = _config->FindFile("Dir::Cache::srcpkgcache");
 666
 667    FileFd SCacheF(SCacheFile,FileFd::ReadOnly);
 668    FileFd CacheF(CacheFile,FileFd::WriteEmpty);
 669    DynamicMMap Map(CacheF,MMap::Public);
 670    if (_error->PendingError() == true)
 671       return false;
 672
 673    // Preload the map with the source cache
 674    if (SCacheF.Read((unsigned char *)Map.Data() + Map.RawAllocate(SCacheF.Size()),
 675                     SCacheF.Size()) == false)
 676       return false;
 677
 678    pkgCacheGenerator Gen(Map,Progress);
 679
 680    // Compute the progress
 681    unsigned long TotalSize = 0;
 682    if (pkgAddSourcesSize(TotalSize) == false)
 683       return false;
 684
 685    unsigned long CurrentSize = 0;
 686    return pkgMergeStatus(Progress,Gen,CurrentSize,TotalSize);
 687 }
 688                                                                         /*}}}*/