apt-pkg/pkgcachegen.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgcachegen.cc,v 1.53.2.1 2003/12/24 23:09:17 mdz 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 #include <config.h>
  14
  15 #include <apt-pkg/pkgcachegen.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/version.h>
  18 #include <apt-pkg/progress.h>
  19 #include <apt-pkg/sourcelist.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/pkgsystem.h>
  22 #include <apt-pkg/macros.h>
  23 #include <apt-pkg/metaindex.h>
  24 #include <apt-pkg/fileutl.h>
  25 #include <apt-pkg/hashsum_template.h>
  26 #include <apt-pkg/indexfile.h>
  27 #include <apt-pkg/md5.h>
  28 #include <apt-pkg/mmap.h>
  29 #include <apt-pkg/pkgcache.h>
  30 #include <apt-pkg/cacheiterators.h>
  31
  32 #include <stddef.h>
  33 #include <string.h>
  34 #include <iostream>
  35 #include <string>
  36 #include <vector>
  37 #include <memory>
  38 #include <algorithm>
  39 #include <sys/stat.h>
  40 #include <unistd.h>
  41
  42 #include <apti18n.h>
  43
  44 template<class T> using Dynamic = pkgCacheGenerator::Dynamic<T>;                                                        /*}}}*/
  45 typedef std::vector<pkgIndexFile *>::iterator FileIterator;
  46 template <typename Iter> std::vector<Iter*> pkgCacheGenerator::Dynamic<Iter>::toReMap;
  47
  48 static bool IsDuplicateDescription(pkgCache::DescIterator Desc,
  49                             MD5SumValue const &CurMd5, std::string const &CurLang);
  50
  51 using std::string;
  52
  53 // CacheGenerator::pkgCacheGenerator - Constructor                      /*{{{*/
  54 // ---------------------------------------------------------------------
  55 /* We set the dirty flag and make sure that is written to the disk */
  56 pkgCacheGenerator::pkgCacheGenerator(DynamicMMap *pMap,OpProgress *Prog) :
  57                     Map(*pMap), Cache(pMap,false), Progress(Prog),
  58                      CurrentRlsFile(NULL), CurrentFile(NULL), d(NULL)
  59 {
  60    if (Map.Size() == 0)
  61    {
  62       // Setup the map interface..
  63       Cache.HeaderP = (pkgCache::Header *)Map.Data();
  64       _error->PushToStack();
  65       Map.RawAllocate(sizeof(pkgCache::Header));
  66       bool const newError = _error->PendingError();
  67       _error->MergeWithStack();
  68       if (newError)
  69          return;
  70
  71       Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));
  72
  73       // Starting header
  74       *Cache.HeaderP = pkgCache::Header();
  75
  76       // make room for the hashtables for packages and groups
  77       if (Map.RawAllocate(2 * (Cache.HeaderP->GetHashTableSize() * sizeof(map_pointer_t))) == 0)
  78          return;
  79
  80       map_stringitem_t const idxVerSysName = WriteStringInMap(_system->VS->Label);
  81       if (unlikely(idxVerSysName == 0))
  82          return;
  83       Cache.HeaderP->VerSysName = idxVerSysName;
  84       map_stringitem_t const idxArchitecture = StoreString(MIXED, _config->Find("APT::Architecture"));
  85       if (unlikely(idxArchitecture == 0))
  86          return;
  87       Cache.HeaderP->Architecture = idxArchitecture;
  88
  89       std::vector<std::string> archs = APT::Configuration::getArchitectures();
  90       if (archs.size() > 1)
  91       {
  92          std::vector<std::string>::const_iterator a = archs.begin();
  93          std::string list = *a;
  94          for (++a; a != archs.end(); ++a)
  95             list.append(",").append(*a);
  96          map_stringitem_t const idxArchitectures = WriteStringInMap(list);
  97          if (unlikely(idxArchitectures == 0))
  98             return;
  99          Cache.HeaderP->SetArchitectures(idxArchitectures);
 100       }
 101       else
 102          Cache.HeaderP->SetArchitectures(idxArchitecture);
 103
 104       Cache.ReMap();
 105    }
 106    else
 107    {
 108       // Map directly from the existing file
 109       Cache.ReMap();
 110       Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));
 111       if (Cache.VS != _system->VS)
 112       {
 113          _error->Error(_("Cache has an incompatible versioning system"));
 114          return;
 115       }
 116    }
 117
 118    Cache.HeaderP->Dirty = true;
 119    Map.Sync(0,sizeof(pkgCache::Header));
 120 }
 121                                                                         /*}}}*/
 122 // CacheGenerator::~pkgCacheGenerator - Destructor                      /*{{{*/
 123 // ---------------------------------------------------------------------
 124 /* We sync the data then unset the dirty flag in two steps so as to
 125    advoid a problem during a crash */
 126 pkgCacheGenerator::~pkgCacheGenerator()
 127 {
 128    if (_error->PendingError() == true || Map.validData() == false)
 129       return;
 130    if (Map.Sync() == false)
 131       return;
 132
 133    Cache.HeaderP->Dirty = false;
 134    Cache.HeaderP->CacheFileSize = Map.Size();
 135    Map.Sync(0,sizeof(pkgCache::Header));
 136 }
 137                                                                         /*}}}*/
 138 void pkgCacheGenerator::ReMap(void const * const oldMap, void const * const newMap) {/*{{{*/
 139    if (oldMap == newMap)
 140       return;
 141
 142    if (_config->FindB("Debug::pkgCacheGen", false))
 143       std::clog << "Remaping from " << oldMap << " to " << newMap << std::endl;
 144
 145    Cache.ReMap(false);
 146
 147    CurrentFile += (pkgCache::PackageFile const * const) newMap - (pkgCache::PackageFile const * const) oldMap;
 148    CurrentRlsFile += (pkgCache::ReleaseFile const * const) newMap - (pkgCache::ReleaseFile const * const) oldMap;
 149
 150    for (std::vector<pkgCache::GrpIterator*>::const_iterator i = Dynamic<pkgCache::GrpIterator>::toReMap.begin();
 151         i != Dynamic<pkgCache::GrpIterator>::toReMap.end(); ++i)
 152       (*i)->ReMap(oldMap, newMap);
 153    for (std::vector<pkgCache::PkgIterator*>::const_iterator i = Dynamic<pkgCache::PkgIterator>::toReMap.begin();
 154         i != Dynamic<pkgCache::PkgIterator>::toReMap.end(); ++i)
 155       (*i)->ReMap(oldMap, newMap);
 156    for (std::vector<pkgCache::VerIterator*>::const_iterator i = Dynamic<pkgCache::VerIterator>::toReMap.begin();
 157         i != Dynamic<pkgCache::VerIterator>::toReMap.end(); ++i)
 158       (*i)->ReMap(oldMap, newMap);
 159    for (std::vector<pkgCache::DepIterator*>::const_iterator i = Dynamic<pkgCache::DepIterator>::toReMap.begin();
 160         i != Dynamic<pkgCache::DepIterator>::toReMap.end(); ++i)
 161       (*i)->ReMap(oldMap, newMap);
 162    for (std::vector<pkgCache::DescIterator*>::const_iterator i = Dynamic<pkgCache::DescIterator>::toReMap.begin();
 163         i != Dynamic<pkgCache::DescIterator>::toReMap.end(); ++i)
 164       (*i)->ReMap(oldMap, newMap);
 165    for (std::vector<pkgCache::PrvIterator*>::const_iterator i = Dynamic<pkgCache::PrvIterator>::toReMap.begin();
 166         i != Dynamic<pkgCache::PrvIterator>::toReMap.end(); ++i)
 167       (*i)->ReMap(oldMap, newMap);
 168    for (std::vector<pkgCache::PkgFileIterator*>::const_iterator i = Dynamic<pkgCache::PkgFileIterator>::toReMap.begin();
 169         i != Dynamic<pkgCache::PkgFileIterator>::toReMap.end(); ++i)
 170       (*i)->ReMap(oldMap, newMap);
 171    for (std::vector<pkgCache::RlsFileIterator*>::const_iterator i = Dynamic<pkgCache::RlsFileIterator>::toReMap.begin();
 172         i != Dynamic<pkgCache::RlsFileIterator>::toReMap.end(); ++i)
 173       (*i)->ReMap(oldMap, newMap);
 174 }                                                                       /*}}}*/
 175 // CacheGenerator::WriteStringInMap                                     /*{{{*/
 176 map_stringitem_t pkgCacheGenerator::WriteStringInMap(const char *String,
 177                                         const unsigned long &Len) {
 178    void const * const oldMap = Map.Data();
 179    map_stringitem_t const index = Map.WriteString(String, Len);
 180    if (index != 0)
 181       ReMap(oldMap, Map.Data());
 182    return index;
 183 }
 184                                                                         /*}}}*/
 185 // CacheGenerator::WriteStringInMap                                     /*{{{*/
 186 map_stringitem_t pkgCacheGenerator::WriteStringInMap(const char *String) {
 187    void const * const oldMap = Map.Data();
 188    map_stringitem_t const index = Map.WriteString(String);
 189    if (index != 0)
 190       ReMap(oldMap, Map.Data());
 191    return index;
 192 }
 193                                                                         /*}}}*/
 194 map_pointer_t pkgCacheGenerator::AllocateInMap(const unsigned long &size) {/*{{{*/
 195    void const * const oldMap = Map.Data();
 196    map_pointer_t const index = Map.Allocate(size);
 197    if (index != 0)
 198       ReMap(oldMap, Map.Data());
 199    return index;
 200 }
 201                                                                         /*}}}*/
 202 // CacheGenerator::MergeList - Merge the package list                   /*{{{*/
 203 // ---------------------------------------------------------------------
 204 /* This provides the generation of the entries in the cache. Each loop
 205    goes through a single package record from the underlying parse engine. */
 206 bool pkgCacheGenerator::MergeList(ListParser &List,
 207                                   pkgCache::VerIterator *OutVer)
 208 {
 209    List.Owner = this;
 210
 211    unsigned int Counter = 0;
 212    while (List.Step() == true)
 213    {
 214       string const PackageName = List.Package();
 215       if (PackageName.empty() == true)
 216          return false;
 217
 218       Counter++;
 219       if (Counter % 100 == 0 && Progress != 0)
 220          Progress->Progress(List.Offset());
 221
 222       string Arch = List.Architecture();
 223       string const Version = List.Version();
 224       if (Version.empty() == true && Arch.empty() == true)
 225       {
 226          // package descriptions
 227          if (MergeListGroup(List, PackageName) == false)
 228             return false;
 229          continue;
 230       }
 231
 232       // Get a pointer to the package structure
 233       pkgCache::PkgIterator Pkg;
 234       Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
 235       if (NewPackage(Pkg, PackageName, Arch) == false)
 236          // TRANSLATOR: The first placeholder is a package name,
 237          // the other two should be copied verbatim as they include debug info
 238          return _error->Error(_("Error occurred while processing %s (%s%d)"),
 239                               PackageName.c_str(), "NewPackage", 1);
 240
 241
 242       if (Version.empty() == true)
 243       {
 244          if (MergeListPackage(List, Pkg) == false)
 245             return false;
 246       }
 247       else
 248       {
 249          if (MergeListVersion(List, Pkg, Version, OutVer) == false)
 250             return false;
 251       }
 252
 253       if (OutVer != 0)
 254          return true;
 255    }
 256
 257    if (Cache.HeaderP->PackageCount >= std::numeric_limits<map_id_t>::max())
 258       return _error->Error(_("Wow, you exceeded the number of package "
 259                              "names this APT is capable of."));
 260    if (Cache.HeaderP->VersionCount >= std::numeric_limits<map_id_t>::max())
 261       return _error->Error(_("Wow, you exceeded the number of versions "
 262                              "this APT is capable of."));
 263    if (Cache.HeaderP->DescriptionCount >= std::numeric_limits<map_id_t>::max())
 264       return _error->Error(_("Wow, you exceeded the number of descriptions "
 265                              "this APT is capable of."));
 266    if (Cache.HeaderP->DependsCount >= std::numeric_limits<map_id_t>::max())
 267       return _error->Error(_("Wow, you exceeded the number of dependencies "
 268                              "this APT is capable of."));
 269
 270    return true;
 271 }
 272 // CacheGenerator::MergeListGroup                                       /*{{{*/
 273 bool pkgCacheGenerator::MergeListGroup(ListParser &List, std::string const &GrpName)
 274 {
 275    pkgCache::GrpIterator Grp = Cache.FindGrp(GrpName);
 276    // a group has no data on it's own, only packages have it but these
 277    // stanzas like this come from Translation- files to add descriptions,
 278    // but without a version we don't need a description for it…
 279    if (Grp.end() == true)
 280       return true;
 281    Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
 282
 283    pkgCache::PkgIterator Pkg;
 284    Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
 285    for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
 286       if (MergeListPackage(List, Pkg) == false)
 287          return false;
 288
 289    return true;
 290 }
 291                                                                         /*}}}*/
 292 // CacheGenerator::MergeListPackage                                     /*{{{*/
 293 bool pkgCacheGenerator::MergeListPackage(ListParser &List, pkgCache::PkgIterator &Pkg)
 294 {
 295    // we first process the package, then the descriptions
 296    // (for deb this package processing is in fact a no-op)
 297    pkgCache::VerIterator Ver(Cache);
 298    Dynamic<pkgCache::VerIterator> DynVer(Ver);
 299    if (List.UsePackage(Pkg, Ver) == false)
 300       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 301                            Pkg.Name(), "UsePackage", 1);
 302
 303    // Find the right version to write the description
 304    MD5SumValue CurMd5 = List.Description_md5();
 305    if (CurMd5.Value().empty() == true && List.Description("").empty() == true)
 306       return true;
 307    std::vector<std::string> availDesc = List.AvailableDescriptionLanguages();
 308    for (Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
 309    {
 310       pkgCache::DescIterator VerDesc = Ver.DescriptionList();
 311
 312       // a version can only have one md5 describing it
 313       if (VerDesc.end() == true || MD5SumValue(VerDesc.md5()) != CurMd5)
 314          continue;
 315
 316       map_stringitem_t md5idx = VerDesc->md5sum;
 317       for (std::vector<std::string>::const_iterator CurLang = availDesc.begin(); CurLang != availDesc.end(); ++CurLang)
 318       {
 319          // don't add a new description if we have one for the given
 320          // md5 && language
 321          if (IsDuplicateDescription(VerDesc, CurMd5, *CurLang) == true)
 322             continue;
 323
 324          AddNewDescription(List, Ver, *CurLang, CurMd5, md5idx);
 325       }
 326
 327       // we can stop here as all "same" versions will share the description
 328       break;
 329    }
 330
 331    return true;
 332 }
 333                                                                         /*}}}*/
 334 // CacheGenerator::MergeListVersion                                     /*{{{*/
 335 bool pkgCacheGenerator::MergeListVersion(ListParser &List, pkgCache::PkgIterator &Pkg,
 336                                          std::string const &Version, pkgCache::VerIterator* &OutVer)
 337 {
 338    pkgCache::VerIterator Ver = Pkg.VersionList();
 339    Dynamic<pkgCache::VerIterator> DynVer(Ver);
 340    map_pointer_t *LastVer = &Pkg->VersionList;
 341    void const * oldMap = Map.Data();
 342
 343    unsigned short const Hash = List.VersionHash();
 344    if (Ver.end() == false)
 345    {
 346       /* We know the list is sorted so we use that fact in the search.
 347          Insertion of new versions is done with correct sorting */
 348       int Res = 1;
 349       for (; Ver.end() == false; LastVer = &Ver->NextVer, ++Ver)
 350       {
 351          Res = Cache.VS->CmpVersion(Version,Ver.VerStr());
 352          // Version is higher as current version - insert here
 353          if (Res > 0)
 354             break;
 355          // Versionstrings are equal - is hash also equal?
 356          if (Res == 0 && List.SameVersion(Hash, Ver) == true)
 357             break;
 358          // proceed with the next till we have either the right
 359          // or we found another version (which will be lower)
 360       }
 361
 362       /* We already have a version for this item, record that we saw it */
 363       if (Res == 0 && Ver.end() == false && Ver->Hash == Hash)
 364       {
 365          if (List.UsePackage(Pkg,Ver) == false)
 366             return _error->Error(_("Error occurred while processing %s (%s%d)"),
 367                                  Pkg.Name(), "UsePackage", 2);
 368
 369          if (NewFileVer(Ver,List) == false)
 370             return _error->Error(_("Error occurred while processing %s (%s%d)"),
 371                                  Pkg.Name(), "NewFileVer", 1);
 372
 373          // Read only a single record and return
 374          if (OutVer != 0)
 375          {
 376             *OutVer = Ver;
 377             return true;
 378          }
 379
 380          return true;
 381       }
 382    }
 383
 384    // Add a new version
 385    map_pointer_t const verindex = NewVersion(Ver, Version, Pkg.Index(), Hash, *LastVer);
 386    if (unlikely(verindex == 0))
 387       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 388                            Pkg.Name(), "NewVersion", 1);
 389
 390    if (oldMap != Map.Data())
 391          LastVer += (map_pointer_t const * const) Map.Data() - (map_pointer_t const * const) oldMap;
 392    *LastVer = verindex;
 393
 394    if (unlikely(List.NewVersion(Ver) == false))
 395       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 396                            Pkg.Name(), "NewVersion", 2);
 397
 398    if (unlikely(List.UsePackage(Pkg,Ver) == false))
 399       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 400                            Pkg.Name(), "UsePackage", 3);
 401
 402    if (unlikely(NewFileVer(Ver,List) == false))
 403       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 404                            Pkg.Name(), "NewFileVer", 2);
 405
 406    pkgCache::GrpIterator Grp = Pkg.Group();
 407    Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
 408
 409    /* If it is the first version of this package we need to add implicit
 410       Multi-Arch dependencies to all other package versions in the group now -
 411       otherwise we just add them for this new version */
 412    if (Pkg.VersionList()->NextVer == 0)
 413    {
 414       pkgCache::PkgIterator P = Grp.PackageList();
 415       Dynamic<pkgCache::PkgIterator> DynP(P);
 416       for (; P.end() != true; P = Grp.NextPkg(P))
 417       {
 418          if (P->ID == Pkg->ID)
 419             continue;
 420          pkgCache::VerIterator V = P.VersionList();
 421          Dynamic<pkgCache::VerIterator> DynV(V);
 422          for (; V.end() != true; ++V)
 423             if (unlikely(AddImplicitDepends(V, Pkg) == false))
 424                return _error->Error(_("Error occurred while processing %s (%s%d)"),
 425                                     Pkg.Name(), "AddImplicitDepends", 1);
 426       }
 427    }
 428    if (unlikely(AddImplicitDepends(Grp, Pkg, Ver) == false))
 429       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 430                            Pkg.Name(), "AddImplicitDepends", 2);
 431
 432    // Read only a single record and return
 433    if (OutVer != 0)
 434    {
 435       *OutVer = Ver;
 436       return true;
 437    }
 438
 439    /* Record the Description(s) based on their master md5sum */
 440    MD5SumValue CurMd5 = List.Description_md5();
 441    if (CurMd5.Value().empty() == true && List.Description("").empty() == true)
 442       return true;
 443
 444    /* Before we add a new description we first search in the group for
 445       a version with a description of the same MD5 - if so we reuse this
 446       description group instead of creating our own for this version */
 447    for (pkgCache::PkgIterator P = Grp.PackageList();
 448         P.end() == false; P = Grp.NextPkg(P))
 449    {
 450       for (pkgCache::VerIterator V = P.VersionList();
 451            V.end() == false; ++V)
 452       {
 453          if (V->DescriptionList == 0 || MD5SumValue(V.DescriptionList().md5()) != CurMd5)
 454             continue;
 455          Ver->DescriptionList = V->DescriptionList;
 456       }
 457    }
 458
 459    // We haven't found reusable descriptions, so add the first description(s)
 460    map_stringitem_t md5idx = Ver->DescriptionList == 0 ? 0 : Ver.DescriptionList()->md5sum;
 461    std::vector<std::string> availDesc = List.AvailableDescriptionLanguages();
 462    for (std::vector<std::string>::const_iterator CurLang = availDesc.begin(); CurLang != availDesc.end(); ++CurLang)
 463       if (AddNewDescription(List, Ver, *CurLang, CurMd5, md5idx) == false)
 464          return false;
 465    return true;
 466 }
 467                                                                         /*}}}*/
 468 bool pkgCacheGenerator::AddNewDescription(ListParser &List, pkgCache::VerIterator &Ver, std::string const &lang, MD5SumValue const &CurMd5, map_stringitem_t &md5idx) /*{{{*/
 469 {
 470    pkgCache::DescIterator Desc;
 471    Dynamic<pkgCache::DescIterator> DynDesc(Desc);
 472
 473    map_pointer_t const descindex = NewDescription(Desc, lang, CurMd5, md5idx);
 474    if (unlikely(descindex == 0))
 475       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 476             Ver.ParentPkg().Name(), "NewDescription", 1);
 477
 478    md5idx = Desc->md5sum;
 479    Desc->ParentPkg = Ver.ParentPkg().Index();
 480
 481    // we add at the end, so that the start is constant as we need
 482    // that to be able to efficiently share these lists
 483    pkgCache::DescIterator VerDesc = Ver.DescriptionList(); // old value might be invalid after ReMap
 484    for (;VerDesc.end() == false && VerDesc->NextDesc != 0; ++VerDesc);
 485    map_pointer_t * const LastNextDesc = (VerDesc.end() == true) ? &Ver->DescriptionList : &VerDesc->NextDesc;
 486    *LastNextDesc = descindex;
 487
 488    if (NewFileDesc(Desc,List) == false)
 489       return _error->Error(_("Error occurred while processing %s (%s%d)"),
 490             Ver.ParentPkg().Name(), "NewFileDesc", 1);
 491
 492    return true;
 493 }
 494                                                                         /*}}}*/
 495                                                                         /*}}}*/
 496 // CacheGenerator::NewGroup - Add a new group                           /*{{{*/
 497 // ---------------------------------------------------------------------
 498 /* This creates a new group structure and adds it to the hash table */
 499 bool pkgCacheGenerator::NewGroup(pkgCache::GrpIterator &Grp, const string &Name)
 500 {
 501    Grp = Cache.FindGrp(Name);
 502    if (Grp.end() == false)
 503       return true;
 504
 505    // Get a structure
 506    map_pointer_t const Group = AllocateInMap(sizeof(pkgCache::Group));
 507    if (unlikely(Group == 0))
 508       return false;
 509
 510    Grp = pkgCache::GrpIterator(Cache, Cache.GrpP + Group);
 511    map_stringitem_t const idxName = StoreString(PKGNAME, Name);
 512    if (unlikely(idxName == 0))
 513       return false;
 514    Grp->Name = idxName;
 515
 516    // Insert it into the hash table
 517    unsigned long const Hash = Cache.Hash(Name);
 518    map_pointer_t *insertAt = &Cache.HeaderP->GrpHashTableP()[Hash];
 519    while (*insertAt != 0 && strcasecmp(Name.c_str(), Cache.StrP + (Cache.GrpP + *insertAt)->Name) > 0)
 520       insertAt = &(Cache.GrpP + *insertAt)->Next;
 521    Grp->Next = *insertAt;
 522    *insertAt = Group;
 523
 524    Grp->ID = Cache.HeaderP->GroupCount++;
 525    return true;
 526 }
 527                                                                         /*}}}*/
 528 // CacheGenerator::NewPackage - Add a new package                       /*{{{*/
 529 // ---------------------------------------------------------------------
 530 /* This creates a new package structure and adds it to the hash table */
 531 bool pkgCacheGenerator::NewPackage(pkgCache::PkgIterator &Pkg,const string &Name,
 532                                         const string &Arch) {
 533    pkgCache::GrpIterator Grp;
 534    Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
 535    if (unlikely(NewGroup(Grp, Name) == false))
 536       return false;
 537
 538    Pkg = Grp.FindPkg(Arch);
 539       if (Pkg.end() == false)
 540          return true;
 541
 542    // Get a structure
 543    map_pointer_t const Package = AllocateInMap(sizeof(pkgCache::Package));
 544    if (unlikely(Package == 0))
 545       return false;
 546    Pkg = pkgCache::PkgIterator(Cache,Cache.PkgP + Package);
 547
 548    // Set the name, arch and the ID
 549    APT_IGNORE_DEPRECATED(Pkg->Name = Grp->Name;)
 550    Pkg->Group = Grp.Index();
 551    // all is mapped to the native architecture
 552    map_stringitem_t const idxArch = (Arch == "all") ? Cache.HeaderP->Architecture : StoreString(MIXED, Arch);
 553    if (unlikely(idxArch == 0))
 554       return false;
 555    Pkg->Arch = idxArch;
 556    Pkg->ID = Cache.HeaderP->PackageCount++;
 557
 558    // Insert the package into our package list
 559    if (Grp->FirstPackage == 0) // the group is new
 560    {
 561       Grp->FirstPackage = Package;
 562       // Insert it into the hash table
 563       map_id_t const Hash = Cache.Hash(Name);
 564       map_pointer_t *insertAt = &Cache.HeaderP->PkgHashTableP()[Hash];
 565       while (*insertAt != 0 && strcasecmp(Name.c_str(), Cache.StrP + (Cache.GrpP + (Cache.PkgP + *insertAt)->Group)->Name) > 0)
 566          insertAt = &(Cache.PkgP + *insertAt)->NextPackage;
 567       Pkg->NextPackage = *insertAt;
 568       *insertAt = Package;
 569    }
 570    else // Group the Packages together
 571    {
 572       // but first get implicit provides done
 573       if (APT::Configuration::checkArchitecture(Pkg.Arch()) == true)
 574       {
 575          pkgCache::PkgIterator const M = Grp.FindPreferredPkg(false); // native or any foreign pkg will do
 576          if (M.end() == false) {
 577             pkgCache::PrvIterator Prv;
 578             Dynamic<pkgCache::PrvIterator> DynPrv(Prv);
 579             for (Prv = M.ProvidesList(); Prv.end() == false; ++Prv)
 580             {
 581                if ((Prv->Flags & pkgCache::Flag::ArchSpecific) != 0)
 582                   continue;
 583                pkgCache::VerIterator Ver = Prv.OwnerVer();
 584                Dynamic<pkgCache::VerIterator> DynVer(Ver);
 585                if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed ||
 586                    ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign &&
 587                         (Prv->Flags & pkgCache::Flag::MultiArchImplicit) == 0))
 588                   if (NewProvides(Ver, Pkg, Prv->ProvideVersion, Prv->Flags) == false)
 589                      return false;
 590             }
 591          }
 592
 593
 594          pkgCache::PkgIterator P;
 595          pkgCache::VerIterator Ver;
 596          Dynamic<pkgCache::PkgIterator> DynP(P);
 597          Dynamic<pkgCache::VerIterator> DynVer(Ver);
 598
 599          for (P = Grp.PackageList(); P.end() == false;  P = Grp.NextPkg(P))
 600             for (Ver = P.VersionList(); Ver.end() == false; ++Ver)
 601                if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign)
 602                   if (NewProvides(Ver, Pkg, Ver->VerStr, pkgCache::Flag::MultiArchImplicit) == false)
 603                      return false;
 604       }
 605       // and negative dependencies, don't forget negative dependencies
 606       {
 607          pkgCache::PkgIterator const M = Grp.FindPreferredPkg(false);
 608          if (M.end() == false) {
 609             pkgCache::DepIterator Dep;
 610             Dynamic<pkgCache::DepIterator> DynDep(Dep);
 611             for (Dep = M.RevDependsList(); Dep.end() == false; ++Dep)
 612             {
 613                if ((Dep->CompareOp & (pkgCache::Dep::ArchSpecific | pkgCache::Dep::MultiArchImplicit)) != 0)
 614                   continue;
 615                if (Dep->Type != pkgCache::Dep::DpkgBreaks && Dep->Type != pkgCache::Dep::Conflicts &&
 616                      Dep->Type != pkgCache::Dep::Replaces)
 617                   continue;
 618                pkgCache::VerIterator Ver = Dep.ParentVer();
 619                Dynamic<pkgCache::VerIterator> DynVer(Ver);
 620                map_pointer_t * unused = NULL;
 621                if (NewDepends(Pkg, Ver, Dep->Version, Dep->CompareOp, Dep->Type, unused) == false)
 622                   return false;
 623             }
 624          }
 625       }
 626
 627       // this package is the new last package
 628       pkgCache::PkgIterator LastPkg(Cache, Cache.PkgP + Grp->LastPackage);
 629       Pkg->NextPackage = LastPkg->NextPackage;
 630       LastPkg->NextPackage = Package;
 631    }
 632    Grp->LastPackage = Package;
 633
 634    // lazy-create foo (of amd64) provides foo:amd64 at the time we first need it
 635    if (Arch == "any")
 636    {
 637       size_t const found = Name.find(':');
 638       std::string const NameA = Name.substr(0, found);
 639       std::string const ArchA = Name.substr(found + 1);
 640       pkgCache::PkgIterator PkgA = Cache.FindPkg(NameA, ArchA);
 641       if (PkgA.end() == false)
 642       {
 643          Dynamic<pkgCache::PkgIterator> DynPkgA(PkgA);
 644          pkgCache::PrvIterator Prv = PkgA.ProvidesList();
 645          for (; Prv.end() == false; ++Prv)
 646          {
 647             if (Prv.IsMultiArchImplicit())
 648                continue;
 649             pkgCache::VerIterator V = Prv.OwnerVer();
 650             if (ArchA != V.ParentPkg().Arch())
 651                continue;
 652             if (NewProvides(V, Pkg, V->VerStr, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
 653                return false;
 654          }
 655          pkgCache::VerIterator V = PkgA.VersionList();
 656          Dynamic<pkgCache::VerIterator> DynV(V);
 657          for (; V.end() == false; ++V)
 658          {
 659             if (NewProvides(V, Pkg, V->VerStr, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
 660                return false;
 661          }
 662       }
 663    }
 664    return true;
 665 }
 666                                                                         /*}}}*/
 667 // CacheGenerator::AddImplicitDepends                                   /*{{{*/
 668 bool pkgCacheGenerator::AddImplicitDepends(pkgCache::GrpIterator &G,
 669                                            pkgCache::PkgIterator &P,
 670                                            pkgCache::VerIterator &V)
 671 {
 672    // copy P.Arch() into a string here as a cache remap
 673    // in NewDepends() later may alter the pointer location
 674    string Arch = P.Arch() == NULL ? "" : P.Arch();
 675    map_pointer_t *OldDepLast = NULL;
 676    /* MultiArch handling introduces a lot of implicit Dependencies:
 677       - MultiArch: same → Co-Installable if they have the same version
 678       - All others conflict with all other group members */
 679    bool const coInstall = ((V->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same);
 680    pkgCache::PkgIterator D = G.PackageList();
 681    Dynamic<pkgCache::PkgIterator> DynD(D);
 682    map_stringitem_t const VerStrIdx = V->VerStr;
 683    for (; D.end() != true; D = G.NextPkg(D))
 684    {
 685       if (Arch == D.Arch() || D->VersionList == 0)
 686          continue;
 687       /* We allow only one installed arch at the time
 688          per group, therefore each group member conflicts
 689          with all other group members */
 690       if (coInstall == true)
 691       {
 692          // Replaces: ${self}:other ( << ${binary:Version})
 693          NewDepends(D, V, VerStrIdx,
 694                     pkgCache::Dep::Less | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Replaces,
 695                     OldDepLast);
 696          // Breaks: ${self}:other (!= ${binary:Version})
 697          NewDepends(D, V, VerStrIdx,
 698                     pkgCache::Dep::NotEquals | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::DpkgBreaks,
 699                     OldDepLast);
 700       } else {
 701          // Conflicts: ${self}:other
 702          NewDepends(D, V, 0,
 703                     pkgCache::Dep::NoOp | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Conflicts,
 704                     OldDepLast);
 705       }
 706    }
 707    return true;
 708 }
 709 bool pkgCacheGenerator::AddImplicitDepends(pkgCache::VerIterator &V,
 710                                            pkgCache::PkgIterator &D)
 711 {
 712    /* MultiArch handling introduces a lot of implicit Dependencies:
 713       - MultiArch: same → Co-Installable if they have the same version
 714       - All others conflict with all other group members */
 715    map_pointer_t *OldDepLast = NULL;
 716    bool const coInstall = ((V->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same);
 717    if (coInstall == true)
 718    {
 719       map_stringitem_t const VerStrIdx = V->VerStr;
 720       // Replaces: ${self}:other ( << ${binary:Version})
 721       NewDepends(D, V, VerStrIdx,
 722                  pkgCache::Dep::Less | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Replaces,
 723                  OldDepLast);
 724       // Breaks: ${self}:other (!= ${binary:Version})
 725       NewDepends(D, V, VerStrIdx,
 726                  pkgCache::Dep::NotEquals | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::DpkgBreaks,
 727                  OldDepLast);
 728    } else {
 729       // Conflicts: ${self}:other
 730       NewDepends(D, V, 0,
 731                  pkgCache::Dep::NoOp | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Conflicts,
 732                  OldDepLast);
 733    }
 734    return true;
 735 }
 736
 737                                                                         /*}}}*/
 738 // CacheGenerator::NewFileVer - Create a new File<->Version association /*{{{*/
 739 // ---------------------------------------------------------------------
 740 /* */
 741 bool pkgCacheGenerator::NewFileVer(pkgCache::VerIterator &Ver,
 742                                    ListParser &List)
 743 {
 744    if (CurrentFile == 0)
 745       return true;
 746
 747    // Get a structure
 748    map_pointer_t const VerFile = AllocateInMap(sizeof(pkgCache::VerFile));
 749    if (VerFile == 0)
 750       return false;
 751
 752    pkgCache::VerFileIterator VF(Cache,Cache.VerFileP + VerFile);
 753    VF->File = CurrentFile - Cache.PkgFileP;
 754
 755    // Link it to the end of the list
 756    map_pointer_t *Last = &Ver->FileList;
 757    for (pkgCache::VerFileIterator V = Ver.FileList(); V.end() == false; ++V)
 758       Last = &V->NextFile;
 759    VF->NextFile = *Last;
 760    *Last = VF.Index();
 761
 762    VF->Offset = List.Offset();
 763    VF->Size = List.Size();
 764    if (Cache.HeaderP->MaxVerFileSize < VF->Size)
 765       Cache.HeaderP->MaxVerFileSize = VF->Size;
 766    Cache.HeaderP->VerFileCount++;
 767
 768    return true;
 769 }
 770                                                                         /*}}}*/
 771 // CacheGenerator::NewVersion - Create a new Version                    /*{{{*/
 772 // ---------------------------------------------------------------------
 773 /* This puts a version structure in the linked list */
 774 map_pointer_t pkgCacheGenerator::NewVersion(pkgCache::VerIterator &Ver,
 775                                             const string &VerStr,
 776                                             map_pointer_t const ParentPkg,
 777                                             unsigned short const Hash,
 778                                             map_pointer_t const Next)
 779 {
 780    // Get a structure
 781    map_pointer_t const Version = AllocateInMap(sizeof(pkgCache::Version));
 782    if (Version == 0)
 783       return 0;
 784
 785    // Fill it in
 786    Ver = pkgCache::VerIterator(Cache,Cache.VerP + Version);
 787    //Dynamic<pkgCache::VerIterator> DynV(Ver); // caller MergeListVersion already takes care of it
 788    Ver->NextVer = Next;
 789    Ver->ParentPkg = ParentPkg;
 790    Ver->Hash = Hash;
 791    Ver->ID = Cache.HeaderP->VersionCount++;
 792
 793    // try to find the version string in the group for reuse
 794    pkgCache::PkgIterator Pkg = Ver.ParentPkg();
 795    pkgCache::GrpIterator Grp = Pkg.Group();
 796    if (Pkg.end() == false && Grp.end() == false)
 797    {
 798       for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
 799       {
 800          if (Pkg == P)
 801             continue;
 802          for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; ++V)
 803          {
 804             int const cmp = strcmp(V.VerStr(), VerStr.c_str());
 805             if (cmp == 0)
 806             {
 807                Ver->VerStr = V->VerStr;
 808                return Version;
 809             }
 810             else if (cmp < 0)
 811                break;
 812          }
 813       }
 814    }
 815    // haven't found the version string, so create
 816    map_stringitem_t const idxVerStr = StoreString(VERSIONNUMBER, VerStr);
 817    if (unlikely(idxVerStr == 0))
 818       return 0;
 819    Ver->VerStr = idxVerStr;
 820    return Version;
 821 }
 822                                                                         /*}}}*/
 823 // CacheGenerator::NewFileDesc - Create a new File<->Desc association   /*{{{*/
 824 // ---------------------------------------------------------------------
 825 /* */
 826 bool pkgCacheGenerator::NewFileDesc(pkgCache::DescIterator &Desc,
 827                                    ListParser &List)
 828 {
 829    if (CurrentFile == 0)
 830       return true;
 831
 832    // Get a structure
 833    map_pointer_t const DescFile = AllocateInMap(sizeof(pkgCache::DescFile));
 834    if (DescFile == 0)
 835       return false;
 836
 837    pkgCache::DescFileIterator DF(Cache,Cache.DescFileP + DescFile);
 838    DF->File = CurrentFile - Cache.PkgFileP;
 839
 840    // Link it to the end of the list
 841    map_pointer_t *Last = &Desc->FileList;
 842    for (pkgCache::DescFileIterator D = Desc.FileList(); D.end() == false; ++D)
 843       Last = &D->NextFile;
 844
 845    DF->NextFile = *Last;
 846    *Last = DF.Index();
 847
 848    DF->Offset = List.Offset();
 849    DF->Size = List.Size();
 850    if (Cache.HeaderP->MaxDescFileSize < DF->Size)
 851       Cache.HeaderP->MaxDescFileSize = DF->Size;
 852    Cache.HeaderP->DescFileCount++;
 853
 854    return true;
 855 }
 856                                                                         /*}}}*/
 857 // CacheGenerator::NewDescription - Create a new Description            /*{{{*/
 858 // ---------------------------------------------------------------------
 859 /* This puts a description structure in the linked list */
 860 map_pointer_t pkgCacheGenerator::NewDescription(pkgCache::DescIterator &Desc,
 861                                             const string &Lang,
 862                                             const MD5SumValue &md5sum,
 863                                             map_stringitem_t const idxmd5str)
 864 {
 865    // Get a structure
 866    map_pointer_t const Description = AllocateInMap(sizeof(pkgCache::Description));
 867    if (Description == 0)
 868       return 0;
 869
 870    // Fill it in
 871    Desc = pkgCache::DescIterator(Cache,Cache.DescP + Description);
 872    Desc->ID = Cache.HeaderP->DescriptionCount++;
 873    map_stringitem_t const idxlanguage_code = StoreString(MIXED, Lang);
 874    if (unlikely(idxlanguage_code == 0))
 875       return 0;
 876    Desc->language_code = idxlanguage_code;
 877
 878    if (idxmd5str != 0)
 879       Desc->md5sum = idxmd5str;
 880    else
 881    {
 882       map_stringitem_t const idxmd5sum = WriteStringInMap(md5sum.Value());
 883       if (unlikely(idxmd5sum == 0))
 884          return 0;
 885       Desc->md5sum = idxmd5sum;
 886    }
 887
 888    return Description;
 889 }
 890                                                                         /*}}}*/
 891 // CacheGenerator::NewDepends - Create a dependency element             /*{{{*/
 892 // ---------------------------------------------------------------------
 893 /* This creates a dependency element in the tree. It is linked to the
 894    version and to the package that it is pointing to. */
 895 bool pkgCacheGenerator::NewDepends(pkgCache::PkgIterator &Pkg,
 896                                    pkgCache::VerIterator &Ver,
 897                                    map_pointer_t const Version,
 898                                    uint8_t const Op,
 899                                    uint8_t const Type,
 900                                    map_pointer_t* &OldDepLast)
 901 {
 902    void const * const oldMap = Map.Data();
 903    // Get a structure
 904    map_pointer_t const Dependency = AllocateInMap(sizeof(pkgCache::Dependency));
 905    if (unlikely(Dependency == 0))
 906       return false;
 907
 908    bool isDuplicate = false;
 909    map_pointer_t DependencyData = 0;
 910    map_pointer_t PreviousData = 0;
 911    if (Pkg->RevDepends != 0)
 912    {
 913       pkgCache::Dependency const * const L = Cache.DepP + Pkg->RevDepends;
 914       DependencyData = L->DependencyData;
 915       do {
 916          pkgCache::DependencyData const * const D = Cache.DepDataP + DependencyData;
 917          if (Version > D->Version)
 918             break;
 919          if (D->Version == Version && D->Type == Type && D->CompareOp == Op)
 920          {
 921             isDuplicate = true;
 922             break;
 923          }
 924          PreviousData = DependencyData;
 925          DependencyData = D->NextData;
 926       } while (DependencyData != 0);
 927    }
 928
 929    if (isDuplicate == false)
 930    {
 931       DependencyData = AllocateInMap(sizeof(pkgCache::DependencyData));
 932       if (unlikely(DependencyData == 0))
 933         return false;
 934    }
 935
 936    pkgCache::Dependency * Link = Cache.DepP + Dependency;
 937    Link->ParentVer = Ver.Index();
 938    Link->DependencyData = DependencyData;
 939    Link->ID = Cache.HeaderP->DependsCount++;
 940
 941    pkgCache::DepIterator Dep(Cache, Link);
 942    if (isDuplicate == false)
 943    {
 944       Dep->Type = Type;
 945       Dep->CompareOp = Op;
 946       Dep->Version = Version;
 947       Dep->Package = Pkg.Index();
 948       ++Cache.HeaderP->DependsDataCount;
 949       if (PreviousData != 0)
 950       {
 951          pkgCache::DependencyData * const D = Cache.DepDataP + PreviousData;
 952          Dep->NextData = D->NextData;
 953          D->NextData = DependencyData;
 954       }
 955       else if (Pkg->RevDepends != 0)
 956       {
 957          pkgCache::Dependency const * const D = Cache.DepP + Pkg->RevDepends;
 958          Dep->NextData = D->DependencyData;
 959       }
 960    }
 961
 962    if (isDuplicate == true || PreviousData != 0)
 963    {
 964       pkgCache::Dependency * const L = Cache.DepP + Pkg->RevDepends;
 965       Link->NextRevDepends = L->NextRevDepends;
 966       L->NextRevDepends = Dependency;
 967    }
 968    else
 969    {
 970       Link->NextRevDepends = Pkg->RevDepends;
 971       Pkg->RevDepends = Dependency;
 972    }
 973
 974
 975    // Do we know where to link the Dependency to?
 976    if (OldDepLast == NULL)
 977    {
 978       OldDepLast = &Ver->DependsList;
 979       for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false; ++D)
 980          OldDepLast = &D->NextDepends;
 981    } else if (oldMap != Map.Data())
 982       OldDepLast += (map_pointer_t const * const) Map.Data() - (map_pointer_t const * const) oldMap;
 983
 984    Dep->NextDepends = *OldDepLast;
 985    *OldDepLast = Dependency;
 986    OldDepLast = &Dep->NextDepends;
 987    return true;
 988 }
 989                                                                         /*}}}*/
 990 // ListParser::NewDepends - Create the environment for a new dependency /*{{{*/
 991 // ---------------------------------------------------------------------
 992 /* This creates a Group and the Package to link this dependency to if
 993    needed and handles also the caching of the old endpoint */
 994 bool pkgCacheListParser::NewDepends(pkgCache::VerIterator &Ver,
 995                                                const string &PackageName,
 996                                                const string &Arch,
 997                                                const string &Version,
 998                                                uint8_t const Op,
 999                                                uint8_t const Type)
1000 {
1001    pkgCache::GrpIterator Grp;
1002    Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
1003    if (unlikely(Owner->NewGroup(Grp, PackageName) == false))
1004       return false;
1005
1006    map_stringitem_t idxVersion = 0;
1007    if (Version.empty() == false)
1008    {
1009       int const CmpOp = Op & 0x0F;
1010       // =-deps are used (79:1) for lockstep on same-source packages (e.g. data-packages)
1011       if (CmpOp == pkgCache::Dep::Equals && strcmp(Version.c_str(), Ver.VerStr()) == 0)
1012          idxVersion = Ver->VerStr;
1013
1014       if (idxVersion == 0)
1015       {
1016          idxVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
1017          if (unlikely(idxVersion == 0))
1018             return false;
1019       }
1020    }
1021
1022    bool const isNegative = (Type == pkgCache::Dep::DpkgBreaks ||
1023          Type == pkgCache::Dep::Conflicts ||
1024          Type == pkgCache::Dep::Replaces);
1025
1026    pkgCache::PkgIterator Pkg;
1027    Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
1028    if (isNegative == false || (Op & pkgCache::Dep::ArchSpecific) == pkgCache::Dep::ArchSpecific || Grp->FirstPackage == 0)
1029    {
1030       // Locate the target package
1031       Pkg = Grp.FindPkg(Arch);
1032       if (Pkg.end() == true) {
1033          if (unlikely(Owner->NewPackage(Pkg, PackageName, Arch) == false))
1034             return false;
1035       }
1036
1037       /* Caching the old end point speeds up generation substantially */
1038       if (OldDepVer != Ver) {
1039          OldDepLast = NULL;
1040          OldDepVer = Ver;
1041       }
1042
1043       return Owner->NewDepends(Pkg, Ver, idxVersion, Op, Type, OldDepLast);
1044    }
1045    else
1046    {
1047       /* Caching the old end point speeds up generation substantially */
1048       if (OldDepVer != Ver) {
1049          OldDepLast = NULL;
1050          OldDepVer = Ver;
1051       }
1052
1053       for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
1054       {
1055          if (Owner->NewDepends(Pkg, Ver, idxVersion, Op, Type, OldDepLast) == false)
1056                return false;
1057       }
1058    }
1059    return true;
1060 }
1061                                                                         /*}}}*/
1062 // ListParser::NewProvides - Create a Provides element                  /*{{{*/
1063 bool pkgCacheListParser::NewProvides(pkgCache::VerIterator &Ver,
1064                                                 const string &PkgName,
1065                                                 const string &PkgArch,
1066                                                 const string &Version,
1067                                                 uint8_t const Flags)
1068 {
1069    pkgCache const &Cache = Owner->Cache;
1070
1071    // We do not add self referencing provides
1072    if (Ver.ParentPkg().Name() == PkgName && (PkgArch == Ver.ParentPkg().Arch() ||
1073         (PkgArch == "all" && strcmp((Cache.StrP + Cache.HeaderP->Architecture), Ver.ParentPkg().Arch()) == 0)) &&
1074          (Version.empty() || Version == Ver.VerStr()))
1075       return true;
1076
1077    // Locate the target package
1078    pkgCache::PkgIterator Pkg;
1079    Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
1080    if (unlikely(Owner->NewPackage(Pkg,PkgName, PkgArch) == false))
1081       return false;
1082
1083    map_stringitem_t idxProvideVersion = 0;
1084    if (Version.empty() == false) {
1085       idxProvideVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
1086       if (unlikely(idxProvideVersion == 0))
1087          return false;
1088    }
1089    return Owner->NewProvides(Ver, Pkg, idxProvideVersion, Flags);
1090 }
1091 bool pkgCacheGenerator::NewProvides(pkgCache::VerIterator &Ver,
1092                                     pkgCache::PkgIterator &Pkg,
1093                                     map_pointer_t const ProvideVersion,
1094                                     uint8_t const Flags)
1095 {
1096    // Get a structure
1097    map_pointer_t const Provides = AllocateInMap(sizeof(pkgCache::Provides));
1098    if (unlikely(Provides == 0))
1099       return false;
1100    ++Cache.HeaderP->ProvidesCount;
1101
1102    // Fill it in
1103    pkgCache::PrvIterator Prv(Cache,Cache.ProvideP + Provides,Cache.PkgP);
1104    Prv->Version = Ver.Index();
1105    Prv->ProvideVersion = ProvideVersion;
1106    Prv->Flags = Flags;
1107    Prv->NextPkgProv = Ver->ProvidesList;
1108    Ver->ProvidesList = Prv.Index();
1109
1110    // Link it to the package
1111    Prv->ParentPkg = Pkg.Index();
1112    Prv->NextProvides = Pkg->ProvidesList;
1113    Pkg->ProvidesList = Prv.Index();
1114    return true;
1115 }
1116                                                                         /*}}}*/
1117 // ListParser::NewProvidesAllArch - add provides for all architectures  /*{{{*/
1118 bool pkgCacheListParser::NewProvidesAllArch(pkgCache::VerIterator &Ver, string const &Package,
1119                                 string const &Version, uint8_t const Flags) {
1120    pkgCache &Cache = Owner->Cache;
1121    pkgCache::GrpIterator Grp = Cache.FindGrp(Package);
1122    Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
1123
1124    if (Grp.end() == true)
1125       return NewProvides(Ver, Package, Cache.NativeArch(), Version, Flags);
1126    else
1127    {
1128       map_stringitem_t idxProvideVersion = 0;
1129       if (Version.empty() == false) {
1130          idxProvideVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
1131          if (unlikely(idxProvideVersion == 0))
1132             return false;
1133       }
1134
1135       bool const isImplicit = (Flags & pkgCache::Flag::MultiArchImplicit) == pkgCache::Flag::MultiArchImplicit;
1136       bool const isArchSpecific = (Flags & pkgCache::Flag::ArchSpecific) == pkgCache::Flag::ArchSpecific;
1137       pkgCache::PkgIterator OwnerPkg = Ver.ParentPkg();
1138       Dynamic<pkgCache::PkgIterator> DynOwnerPkg(OwnerPkg);
1139       pkgCache::PkgIterator Pkg;
1140       Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
1141       for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
1142       {
1143          if (isImplicit && OwnerPkg == Pkg)
1144             continue;
1145          if (isArchSpecific == false && APT::Configuration::checkArchitecture(OwnerPkg.Arch()) == false)
1146             continue;
1147          if (Owner->NewProvides(Ver, Pkg, idxProvideVersion, Flags) == false)
1148             return false;
1149       }
1150    }
1151    return true;
1152 }
1153                                                                         /*}}}*/
1154 bool pkgCacheListParser::SameVersion(unsigned short const Hash,         /*{{{*/
1155       pkgCache::VerIterator const &Ver)
1156 {
1157    return Hash == Ver->Hash;
1158 }
1159                                                                         /*}}}*/
1160 // CacheGenerator::SelectReleaseFile - Select the current release file the indexes belong to    /*{{{*/
1161 bool pkgCacheGenerator::SelectReleaseFile(const string &File,const string &Site,
1162                                    unsigned long Flags)
1163 {
1164    if (File.empty() && Site.empty())
1165    {
1166       CurrentRlsFile = NULL;
1167       return true;
1168    }
1169
1170    // Get some space for the structure
1171    map_pointer_t const idxFile = AllocateInMap(sizeof(*CurrentRlsFile));
1172    if (unlikely(idxFile == 0))
1173       return false;
1174    CurrentRlsFile = Cache.RlsFileP + idxFile;
1175
1176    // Fill it in
1177    map_stringitem_t const idxFileName = WriteStringInMap(File);
1178    map_stringitem_t const idxSite = StoreString(MIXED, Site);
1179    if (unlikely(idxFileName == 0 || idxSite == 0))
1180       return false;
1181    CurrentRlsFile->FileName = idxFileName;
1182    CurrentRlsFile->Site = idxSite;
1183    CurrentRlsFile->NextFile = Cache.HeaderP->RlsFileList;
1184    CurrentRlsFile->Flags = Flags;
1185    CurrentRlsFile->ID = Cache.HeaderP->ReleaseFileCount;
1186    RlsFileName = File;
1187    Cache.HeaderP->RlsFileList = CurrentRlsFile - Cache.RlsFileP;
1188    Cache.HeaderP->ReleaseFileCount++;
1189
1190    return true;
1191 }
1192                                                                         /*}}}*/
1193 // CacheGenerator::SelectFile - Select the current file being parsed    /*{{{*/
1194 // ---------------------------------------------------------------------
1195 /* This is used to select which file is to be associated with all newly
1196    added versions. The caller is responsible for setting the IMS fields. */
1197 bool pkgCacheGenerator::SelectFile(std::string const &File,
1198                                    pkgIndexFile const &Index,
1199                                    std::string const &Architecture,
1200                                    std::string const &Component,
1201                                    unsigned long const Flags)
1202 {
1203    // Get some space for the structure
1204    map_pointer_t const idxFile = AllocateInMap(sizeof(*CurrentFile));
1205    if (unlikely(idxFile == 0))
1206       return false;
1207    CurrentFile = Cache.PkgFileP + idxFile;
1208
1209    // Fill it in
1210    map_stringitem_t const idxFileName = WriteStringInMap(File);
1211    if (unlikely(idxFileName == 0))
1212       return false;
1213    CurrentFile->FileName = idxFileName;
1214    CurrentFile->NextFile = Cache.HeaderP->FileList;
1215    CurrentFile->ID = Cache.HeaderP->PackageFileCount;
1216    map_stringitem_t const idxIndexType = StoreString(MIXED, Index.GetType()->Label);
1217    if (unlikely(idxIndexType == 0))
1218       return false;
1219    CurrentFile->IndexType = idxIndexType;
1220    if (Architecture.empty())
1221       CurrentFile->Architecture = 0;
1222    else
1223    {
1224       map_stringitem_t const arch = StoreString(pkgCacheGenerator::MIXED, Architecture);
1225       if (unlikely(arch == 0))
1226          return false;
1227       CurrentFile->Architecture = arch;
1228    }
1229    map_stringitem_t const component = StoreString(pkgCacheGenerator::MIXED, Component);
1230    if (unlikely(component == 0))
1231       return false;
1232    CurrentFile->Component = component;
1233    CurrentFile->Flags = Flags;
1234    if (CurrentRlsFile != NULL)
1235       CurrentFile->Release = CurrentRlsFile - Cache.RlsFileP;
1236    else
1237       CurrentFile->Release = 0;
1238    PkgFileName = File;
1239    Cache.HeaderP->FileList = CurrentFile - Cache.PkgFileP;
1240    Cache.HeaderP->PackageFileCount++;
1241
1242    if (Progress != 0)
1243       Progress->SubProgress(Index.Size());
1244    return true;
1245 }
1246                                                                         /*}}}*/
1247 // CacheGenerator::WriteUniqueString - Insert a unique string           /*{{{*/
1248 // ---------------------------------------------------------------------
1249 /* This is used to create handles to strings. Given the same text it
1250    always returns the same number */
1251 map_stringitem_t pkgCacheGenerator::StoreString(enum StringType const type, const char *S,
1252                                                  unsigned int Size)
1253 {
1254    std::string const key(S, Size);
1255
1256    std::unordered_map<std::string,map_stringitem_t> * strings;
1257    switch(type) {
1258       case MIXED: strings = &strMixed; break;
1259       case PKGNAME: strings = &strPkgNames; break;
1260       case VERSIONNUMBER: strings = &strVersions; break;
1261       case SECTION: strings = &strSections; break;
1262       default: _error->Fatal("Unknown enum type used for string storage of '%s'", key.c_str()); return 0;
1263    }
1264
1265    std::unordered_map<std::string,map_stringitem_t>::const_iterator const item = strings->find(key);
1266    if (item != strings->end())
1267       return item->second;
1268
1269    map_stringitem_t const idxString = WriteStringInMap(S,Size);
1270    strings->insert(std::make_pair(key, idxString));
1271    return idxString;
1272 }
1273                                                                         /*}}}*/
1274 // CheckValidity - Check that a cache is up-to-date                     /*{{{*/
1275 // ---------------------------------------------------------------------
1276 /* This just verifies that each file in the list of index files exists,
1277    has matching attributes with the cache and the cache does not have
1278    any extra files. */
1279 class APT_HIDDEN ScopedErrorRevert {
1280 public:
1281    ScopedErrorRevert() { _error->PushToStack(); }
1282    ~ScopedErrorRevert() { _error->RevertToStack(); }
1283 };
1284 static bool CheckValidity(const string &CacheFile,
1285                           pkgSourceList &List,
1286                           FileIterator const Start,
1287                           FileIterator const End,
1288                           MMap **OutMap = 0)
1289 {
1290    ScopedErrorRevert ser;
1291    bool const Debug = _config->FindB("Debug::pkgCacheGen", false);
1292    // No file, certainly invalid
1293    if (CacheFile.empty() == true || FileExists(CacheFile) == false)
1294    {
1295       if (Debug == true)
1296          std::clog << "CacheFile " << CacheFile << " doesn't exist" << std::endl;
1297       return false;
1298    }
1299
1300    if (List.GetLastModifiedTime() > GetModificationTime(CacheFile))
1301    {
1302       if (Debug == true)
1303          std::clog << "sources.list is newer than the cache" << std::endl;
1304       return false;
1305    }
1306
1307    // Map it
1308    FileFd CacheF(CacheFile,FileFd::ReadOnly);
1309    std::unique_ptr<MMap> Map(new MMap(CacheF,0));
1310    if (unlikely(Map->validData()) == false)
1311       return false;
1312    pkgCache Cache(Map.get());
1313    if (_error->PendingError() || Map->Size() == 0)
1314    {
1315       if (Debug == true)
1316          std::clog << "Errors are pending or Map is empty() for " << CacheFile << std::endl;
1317       return false;
1318    }
1319
1320    std::unique_ptr<bool[]> RlsVisited(new bool[Cache.HeaderP->ReleaseFileCount]);
1321    memset(RlsVisited.get(),0,sizeof(RlsVisited[0])*Cache.HeaderP->ReleaseFileCount);
1322    std::vector<pkgIndexFile *> Files;
1323    for (pkgSourceList::const_iterator i = List.begin(); i != List.end(); ++i)
1324    {
1325       if (Debug == true)
1326          std::clog << "Checking RlsFile " << (*i)->Describe() << ": ";
1327       pkgCache::RlsFileIterator const RlsFile = (*i)->FindInCache(Cache, true);
1328       if (RlsFile.end() == true)
1329       {
1330          if (Debug == true)
1331             std::clog << "FindInCache returned end-Pointer" << std::endl;
1332          return false;
1333       }
1334
1335       RlsVisited[RlsFile->ID] = true;
1336       if (Debug == true)
1337          std::clog << "with ID " << RlsFile->ID << " is valid" << std::endl;
1338
1339       std::vector <pkgIndexFile *> const * const Indexes = (*i)->GetIndexFiles();
1340       std::copy_if(Indexes->begin(), Indexes->end(), std::back_inserter(Files),
1341             [](pkgIndexFile const * const I) { return I->HasPackages(); });
1342    }
1343    for (unsigned I = 0; I != Cache.HeaderP->ReleaseFileCount; ++I)
1344       if (RlsVisited[I] == false)
1345       {
1346          if (Debug == true)
1347             std::clog << "RlsFile with ID" << I << " wasn't visited" << std::endl;
1348          return false;
1349       }
1350
1351    std::copy(Start, End, std::back_inserter(Files));
1352
1353    /* Now we check every index file, see if it is in the cache,
1354       verify the IMS data and check that it is on the disk too.. */
1355    std::unique_ptr<bool[]> Visited(new bool[Cache.HeaderP->PackageFileCount]);
1356    memset(Visited.get(),0,sizeof(Visited[0])*Cache.HeaderP->PackageFileCount);
1357    for (std::vector<pkgIndexFile *>::const_reverse_iterator PkgFile = Files.rbegin(); PkgFile != Files.rend(); ++PkgFile)
1358    {
1359       if (Debug == true)
1360          std::clog << "Checking PkgFile " << (*PkgFile)->Describe() << ": ";
1361       if ((*PkgFile)->Exists() == false)
1362       {
1363          if (Debug == true)
1364             std::clog << "file doesn't exist" << std::endl;
1365          continue;
1366       }
1367
1368       // FindInCache is also expected to do an IMS check.
1369       pkgCache::PkgFileIterator File = (*PkgFile)->FindInCache(Cache);
1370       if (File.end() == true)
1371       {
1372          if (Debug == true)
1373             std::clog << "FindInCache returned end-Pointer" << std::endl;
1374          return false;
1375       }
1376
1377       Visited[File->ID] = true;
1378       if (Debug == true)
1379          std::clog << "with ID " << File->ID << " is valid" << std::endl;
1380    }
1381
1382    for (unsigned I = 0; I != Cache.HeaderP->PackageFileCount; I++)
1383       if (Visited[I] == false)
1384       {
1385          if (Debug == true)
1386             std::clog << "PkgFile with ID" << I << " wasn't visited" << std::endl;
1387          return false;
1388       }
1389
1390    if (_error->PendingError() == true)
1391    {
1392       if (Debug == true)
1393       {
1394          std::clog << "Validity failed because of pending errors:" << std::endl;
1395          _error->DumpErrors(std::clog, GlobalError::DEBUG, false);
1396       }
1397       return false;
1398    }
1399
1400    if (OutMap != 0)
1401       *OutMap = Map.release();
1402    return true;
1403 }
1404                                                                         /*}}}*/
1405 // ComputeSize - Compute the total size of a bunch of files             /*{{{*/
1406 // ---------------------------------------------------------------------
1407 /* Size is kind of an abstract notion that is only used for the progress
1408    meter */
1409 static map_filesize_t ComputeSize(pkgSourceList const * const List, FileIterator Start,FileIterator End)
1410 {
1411    map_filesize_t TotalSize = 0;
1412    if (List !=  NULL)
1413    {
1414       for (pkgSourceList::const_iterator i = List->begin(); i != List->end(); ++i)
1415       {
1416          std::vector <pkgIndexFile *> *Indexes = (*i)->GetIndexFiles();
1417          for (std::vector<pkgIndexFile *>::const_iterator j = Indexes->begin(); j != Indexes->end(); ++j)
1418             if ((*j)->HasPackages() == true)
1419                TotalSize += (*j)->Size();
1420       }
1421    }
1422
1423    for (; Start < End; ++Start)
1424    {
1425       if ((*Start)->HasPackages() == false)
1426          continue;
1427       TotalSize += (*Start)->Size();
1428    }
1429    return TotalSize;
1430 }
1431                                                                         /*}}}*/
1432 // BuildCache - Merge the list of index files into the cache            /*{{{*/
1433 static bool BuildCache(pkgCacheGenerator &Gen,
1434                        OpProgress * const Progress,
1435                        map_filesize_t &CurrentSize,map_filesize_t TotalSize,
1436                        pkgSourceList const * const List,
1437                        FileIterator const Start, FileIterator const End)
1438 {
1439    bool mergeFailure = false;
1440
1441    auto const indexFileMerge = [&](pkgIndexFile * const I) {
1442       if (I->HasPackages() == false || mergeFailure)
1443          return;
1444
1445       if (I->Exists() == false)
1446          return;
1447
1448       if (I->FindInCache(Gen.GetCache()).end() == false)
1449       {
1450          _error->Warning("Duplicate sources.list entry %s",
1451                I->Describe().c_str());
1452          return;
1453       }
1454
1455       map_filesize_t const Size = I->Size();
1456       if (Progress != NULL)
1457          Progress->OverallProgress(CurrentSize, TotalSize, Size, _("Reading package lists"));
1458       CurrentSize += Size;
1459
1460       if (I->Merge(Gen,Progress) == false)
1461          mergeFailure = true;
1462    };
1463
1464    if (List !=  NULL)
1465    {
1466       for (pkgSourceList::const_iterator i = List->begin(); i != List->end(); ++i)
1467       {
1468          if ((*i)->FindInCache(Gen.GetCache(), false).end() == false)
1469          {
1470             _error->Warning("Duplicate sources.list entry %s",
1471                   (*i)->Describe().c_str());
1472             continue;
1473          }
1474
1475          if ((*i)->Merge(Gen, Progress) == false)
1476             return false;
1477
1478          std::vector <pkgIndexFile *> *Indexes = (*i)->GetIndexFiles();
1479          if (Indexes != NULL)
1480             std::for_each(Indexes->begin(), Indexes->end(), indexFileMerge);
1481          if (mergeFailure)
1482             return false;
1483       }
1484    }
1485
1486    if (Start != End)
1487    {
1488       Gen.SelectReleaseFile("", "");
1489       std::for_each(Start, End, indexFileMerge);
1490       if (mergeFailure)
1491          return false;
1492    }
1493    return true;
1494 }
1495                                                                         /*}}}*/
1496 // CacheGenerator::MakeStatusCache - Construct the status cache         /*{{{*/
1497 // ---------------------------------------------------------------------
1498 /* This makes sure that the status cache (the cache that has all
1499    index files from the sources list and all local ones) is ready
1500    to be mmaped. If OutMap is not zero then a MMap object representing
1501    the cache will be stored there. This is pretty much mandetory if you
1502    are using AllowMem. AllowMem lets the function be run as non-root
1503    where it builds the cache 'fast' into a memory buffer. */
1504 static DynamicMMap* CreateDynamicMMap(FileFd * const CacheF, unsigned long Flags)
1505 {
1506    map_filesize_t const MapStart = _config->FindI("APT::Cache-Start", 24*1024*1024);
1507    map_filesize_t const MapGrow = _config->FindI("APT::Cache-Grow", 1*1024*1024);
1508    map_filesize_t const MapLimit = _config->FindI("APT::Cache-Limit", 0);
1509    Flags |= MMap::Moveable;
1510    if (_config->FindB("APT::Cache-Fallback", false) == true)
1511       Flags |= MMap::Fallback;
1512    if (CacheF != NULL)
1513       return new DynamicMMap(*CacheF, Flags, MapStart, MapGrow, MapLimit);
1514    else
1515       return new DynamicMMap(Flags, MapStart, MapGrow, MapLimit);
1516 }
1517 static bool writeBackMMapToFile(pkgCacheGenerator * const Gen, DynamicMMap * const Map,
1518       std::string const &FileName)
1519 {
1520    FileFd SCacheF(FileName, FileFd::WriteAtomic);
1521    if (SCacheF.IsOpen() == false || SCacheF.Failed())
1522       return false;
1523
1524    fchmod(SCacheF.Fd(),0644);
1525
1526    // Write out the main data
1527    if (SCacheF.Write(Map->Data(),Map->Size()) == false)
1528       return _error->Error(_("IO Error saving source cache"));
1529    SCacheF.Sync();
1530
1531    // Write out the proper header
1532    Gen->GetCache().HeaderP->Dirty = false;
1533    if (SCacheF.Seek(0) == false ||
1534          SCacheF.Write(Map->Data(),sizeof(*Gen->GetCache().HeaderP)) == false)
1535       return _error->Error(_("IO Error saving source cache"));
1536    Gen->GetCache().HeaderP->Dirty = true;
1537    SCacheF.Sync();
1538    return true;
1539 }
1540 static bool loadBackMMapFromFile(std::unique_ptr<pkgCacheGenerator> &Gen,
1541       std::unique_ptr<DynamicMMap> &Map, OpProgress * const Progress, std::string const &FileName)
1542 {
1543    Map.reset(CreateDynamicMMap(NULL, 0));
1544    if (unlikely(Map->validData()) == false)
1545       return false;
1546    FileFd CacheF(FileName, FileFd::ReadOnly);
1547    if (CacheF.IsOpen() == false || CacheF.Failed())
1548       return false;
1549    _error->PushToStack();
1550    map_pointer_t const alloc = Map->RawAllocate(CacheF.Size());
1551    bool const newError = _error->PendingError();
1552    _error->MergeWithStack();
1553    if (alloc == 0 && newError)
1554       return false;
1555    if (CacheF.Read((unsigned char *)Map->Data() + alloc, CacheF.Size()) == false)
1556       return false;
1557    Gen.reset(new pkgCacheGenerator(Map.get(),Progress));
1558    return true;
1559 }
1560 bool pkgMakeStatusCache(pkgSourceList &List,OpProgress &Progress,
1561                         MMap **OutMap, bool AllowMem)
1562    { return pkgCacheGenerator::MakeStatusCache(List, &Progress, OutMap, AllowMem); }
1563 bool pkgCacheGenerator::MakeStatusCache(pkgSourceList &List,OpProgress *Progress,
1564                         MMap **OutMap,bool)
1565 {
1566    // FIXME: deprecate the ignored AllowMem parameter
1567    bool const Debug = _config->FindB("Debug::pkgCacheGen", false);
1568
1569    std::vector<pkgIndexFile *> Files;
1570    if (_system->AddStatusFiles(Files) == false)
1571       return false;
1572
1573    // Decide if we can write to the files..
1574    string const CacheFile = _config->FindFile("Dir::Cache::pkgcache");
1575    string const SrcCacheFile = _config->FindFile("Dir::Cache::srcpkgcache");
1576
1577    // ensure the cache directory exists
1578    if (CacheFile.empty() == false || SrcCacheFile.empty() == false)
1579    {
1580       string dir = _config->FindDir("Dir::Cache");
1581       size_t const len = dir.size();
1582       if (len > 5 && dir.find("/apt/", len - 6, 5) == len - 5)
1583          dir = dir.substr(0, len - 5);
1584       if (CacheFile.empty() == false)
1585          CreateDirectory(dir, flNotFile(CacheFile));
1586       if (SrcCacheFile.empty() == false)
1587          CreateDirectory(dir, flNotFile(SrcCacheFile));
1588    }
1589
1590    if (Progress != NULL)
1591       Progress->OverallProgress(0,1,1,_("Reading package lists"));
1592
1593    bool pkgcache_fine = false;
1594    bool srcpkgcache_fine = false;
1595    bool volatile_fine = List.GetVolatileFiles().empty();
1596
1597    if (CheckValidity(CacheFile, List, Files.begin(), Files.end(), volatile_fine ? OutMap : NULL) == true)
1598    {
1599       if (Debug == true)
1600          std::clog << "pkgcache.bin is valid - no need to build any cache" << std::endl;
1601       pkgcache_fine = true;
1602       srcpkgcache_fine = true;
1603    }
1604    if (pkgcache_fine == false)
1605    {
1606       if (CheckValidity(SrcCacheFile, List, Files.end(), Files.end()) == true)
1607       {
1608          if (Debug == true)
1609             std::clog << "srcpkgcache.bin is valid - it can be reused" << std::endl;
1610          srcpkgcache_fine = true;
1611       }
1612    }
1613
1614    if (volatile_fine == true && srcpkgcache_fine == true && pkgcache_fine == true)
1615    {
1616       if (Progress != NULL)
1617          Progress->OverallProgress(1,1,1,_("Reading package lists"));
1618       return true;
1619    }
1620
1621    bool Writeable = false;
1622    if (srcpkgcache_fine == false || pkgcache_fine == false)
1623    {
1624       if (CacheFile.empty() == false)
1625          Writeable = access(flNotFile(CacheFile).c_str(),W_OK) == 0;
1626       else if (SrcCacheFile.empty() == false)
1627          Writeable = access(flNotFile(SrcCacheFile).c_str(),W_OK) == 0;
1628
1629       if (Debug == true)
1630          std::clog << "Do we have write-access to the cache files? " << (Writeable ? "YES" : "NO") << std::endl;
1631    }
1632
1633    // At this point we know we need to construct something, so get storage ready
1634    std::unique_ptr<DynamicMMap> Map(CreateDynamicMMap(NULL, 0));
1635    if (unlikely(Map->validData()) == false)
1636       return false;
1637    if (Debug == true)
1638       std::clog << "Open memory Map (not filebased)" << std::endl;
1639
1640    std::unique_ptr<pkgCacheGenerator> Gen{nullptr};
1641    map_filesize_t CurrentSize = 0;
1642    std::vector<pkgIndexFile*> VolatileFiles = List.GetVolatileFiles();
1643    map_filesize_t TotalSize = ComputeSize(NULL, VolatileFiles.begin(), VolatileFiles.end());
1644    if (srcpkgcache_fine == true && pkgcache_fine == false)
1645    {
1646       if (Debug == true)
1647          std::clog << "srcpkgcache.bin was valid - populate MMap with it" << std::endl;
1648       if (loadBackMMapFromFile(Gen, Map, Progress, SrcCacheFile) == false)
1649          return false;
1650       srcpkgcache_fine = true;
1651       TotalSize += ComputeSize(NULL, Files.begin(), Files.end());
1652    }
1653    else if (srcpkgcache_fine == false)
1654    {
1655       if (Debug == true)
1656          std::clog << "srcpkgcache.bin is NOT valid - rebuild" << std::endl;
1657       Gen.reset(new pkgCacheGenerator(Map.get(),Progress));
1658
1659       TotalSize += ComputeSize(&List, Files.begin(),Files.end());
1660       if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, &List,
1661                Files.end(),Files.end()) == false)
1662          return false;
1663
1664       if (Writeable == true && SrcCacheFile.empty() == false)
1665          if (writeBackMMapToFile(Gen.get(), Map.get(), SrcCacheFile) == false)
1666             return false;
1667    }
1668
1669    if (pkgcache_fine == false)
1670    {
1671       if (Debug == true)
1672          std::clog << "Building status cache in pkgcache.bin now" << std::endl;
1673       if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, NULL,
1674                Files.begin(), Files.end()) == false)
1675          return false;
1676
1677       if (Writeable == true && CacheFile.empty() == false)
1678          if (writeBackMMapToFile(Gen.get(), Map.get(), CacheFile) == false)
1679             return false;
1680    }
1681
1682    if (Debug == true)
1683       std::clog << "Caches done. Now bring in the volatile files (if any)" << std::endl;
1684
1685    if (volatile_fine == false)
1686    {
1687       if (Gen == nullptr)
1688       {
1689          if (Debug == true)
1690             std::clog << "Populate new MMap with cachefile contents" << std::endl;
1691          if (loadBackMMapFromFile(Gen, Map, Progress, CacheFile) == false)
1692             return false;
1693       }
1694
1695       Files = List.GetVolatileFiles();
1696       if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, NULL,
1697                Files.begin(), Files.end()) == false)
1698          return false;
1699    }
1700
1701    if (OutMap != nullptr)
1702       *OutMap = Map.release();
1703
1704    if (Debug == true)
1705       std::clog << "Everything is ready for shipping" << std::endl;
1706    return true;
1707 }
1708                                                                         /*}}}*/
1709 // CacheGenerator::MakeOnlyStatusCache - Build only a status files cache/*{{{*/
1710 class APT_HIDDEN ScopedErrorMerge {
1711 public:
1712    ScopedErrorMerge() { _error->PushToStack(); }
1713    ~ScopedErrorMerge() { _error->MergeWithStack(); }
1714 };
1715 bool pkgMakeOnlyStatusCache(OpProgress &Progress,DynamicMMap **OutMap)
1716    { return pkgCacheGenerator::MakeOnlyStatusCache(&Progress, OutMap); }
1717 bool pkgCacheGenerator::MakeOnlyStatusCache(OpProgress *Progress,DynamicMMap **OutMap)
1718 {
1719    std::vector<pkgIndexFile *> Files;
1720    if (_system->AddStatusFiles(Files) == false)
1721       return false;
1722
1723    ScopedErrorMerge sem;
1724    std::unique_ptr<DynamicMMap> Map(CreateDynamicMMap(NULL, 0));
1725    if (unlikely(Map->validData()) == false)
1726       return false;
1727    map_filesize_t CurrentSize = 0;
1728    map_filesize_t TotalSize = 0;
1729    TotalSize = ComputeSize(NULL, Files.begin(), Files.end());
1730
1731    // Build the status cache
1732    if (Progress != NULL)
1733       Progress->OverallProgress(0,1,1,_("Reading package lists"));
1734    pkgCacheGenerator Gen(Map.get(),Progress);
1735    if (_error->PendingError() == true)
1736       return false;
1737    if (BuildCache(Gen,Progress,CurrentSize,TotalSize, NULL,
1738                   Files.begin(), Files.end()) == false)
1739       return false;
1740
1741    if (_error->PendingError() == true)
1742       return false;
1743    *OutMap = Map.release();
1744
1745    return true;
1746 }
1747                                                                         /*}}}*/
1748 // IsDuplicateDescription                                               /*{{{*/
1749 static bool IsDuplicateDescription(pkgCache::DescIterator Desc,
1750                             MD5SumValue const &CurMd5, std::string const &CurLang)
1751 {
1752    // Descriptions in the same link-list have all the same md5
1753    if (Desc.end() == true || MD5SumValue(Desc.md5()) != CurMd5)
1754       return false;
1755    for (; Desc.end() == false; ++Desc)
1756       if (Desc.LanguageCode() == CurLang)
1757          return true;
1758    return false;
1759 }
1760                                                                         /*}}}*/
1761
1762 pkgCacheListParser::pkgCacheListParser() : Owner(NULL), OldDepLast(NULL), d(NULL) {}
1763 pkgCacheListParser::~pkgCacheListParser() {}