// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
/* ######################################################################

   Package Cache Generator - Generator for the cache structure.

   This builds the cache structure from the abstract package list parser.

   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <config.h>

#include <apt-pkg/configuration.h>
#include <apt-pkg/deblistparser.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/indexfile.h>
#include <apt-pkg/macros.h>
#include <apt-pkg/metaindex.h>
#include <apt-pkg/mmap.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/pkgcachegen.h>
#include <apt-pkg/pkgsystem.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/version.h>

#include <algorithm>
#include <cstddef>
#include <cstring>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <sys/stat.h>
#include <unistd.h>

#include <apti18n.h>
									/*}}}*/
constexpr auto APT_CACHE_START_DEFAULT = 24 * 1024 * 1024;

template<class T> using Dynamic = pkgCacheGenerator::Dynamic<T>;
typedef std::vector<pkgIndexFile *>::iterator FileIterator;
template <typename Iter> std::vector<Iter*> pkgCacheGenerator::Dynamic<Iter>::toReMap;

using std::string;
using std::string_view;

// Convert an offset returned from e.g. DynamicMMap or ptr difference to
// an uint32_t location without data loss.
template <typename T>
static inline uint32_t NarrowOffset(T ptr)
{
   uint32_t res = static_cast<uint32_t>(ptr);
   if (unlikely(ptr < 0))
      abort();
   if (unlikely(static_cast<T>(res) != ptr))
      abort();
   return res;
}

// CacheGenerator::pkgCacheGenerator - Constructor			/*{{{*/
// ---------------------------------------------------------------------
/* We set the dirty flag and make sure that is written to the disk */
pkgCacheGenerator::pkgCacheGenerator(DynamicMMap *pMap,OpProgress *Prog) :
		    Map(*pMap), Cache(pMap,false), Progress(Prog),
		     CurrentRlsFile(nullptr), CurrentFile(nullptr), d(nullptr)
{
   // Reserve some space for version extra data, to avoid lots of small resizes.
   VersionExtra.reserve(32 * 1024);
}
bool pkgCacheGenerator::Start()
{
   if (Map.Size() == 0)
   {
      // Setup the map interface..
      Cache.HeaderP = (pkgCache::Header *)Map.Data();
      _error->PushToStack();
      Map.RawAllocate(sizeof(pkgCache::Header));
      bool const newError = _error->PendingError();
      _error->MergeWithStack();
      if (newError)
	 return false;
      if (Map.Size() <= 0)
	 return false;

      Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));

      // Starting header
      new (Cache.HeaderP) pkgCache::Header();

      // make room for the hashtables for packages and groups
      if (Map.RawAllocate(2 * (Cache.HeaderP->GetHashTableSize() * sizeof(map_pointer<void>))) == 0)
	 return false;

      map_stringitem_t const idxVerSysName = WriteStringInMap(_system->VS->Label);
      if (unlikely(idxVerSysName == 0))
	 return false;
      map_stringitem_t const idxArchitecture = StoreString(MIXED, _config->Find("APT::Architecture"));
      if (unlikely(idxArchitecture == 0))
	 return false;
      map_stringitem_t idxArchitectures;

      std::vector<std::string> archs = APT::Configuration::getArchitectures();
      auto const &variants = APT::Configuration::getArchitectureVariants(true);
      if (archs.size() > 1 || not variants.empty())
      {
	 std::vector<std::string>::const_iterator a = archs.begin();
	 std::string list = *a;
	 for (++a; a != archs.end(); ++a)
	    list.append(",").append(*a);
	 if (not variants.empty())
	 {
	    list.append(";");
	    for (auto const &variant : variants)
	    {
	       if (list.back() != ';')
		  list.append(",");
	       list.append(variant.name);
	    }
	 }
	 idxArchitectures = WriteStringInMap(list);
	 if (unlikely(idxArchitectures == 0))
	    return false;
      }
      else
	 idxArchitectures = idxArchitecture;

      Cache.HeaderP = (pkgCache::Header *)Map.Data();
      Cache.HeaderP->VerSysName = idxVerSysName;
      Cache.HeaderP->Architecture = idxArchitecture;
      Cache.HeaderP->SetArchitectures(idxArchitectures);

      // Calculate the hash for the empty map, so ReMap does not fail
      Cache.HeaderP->CacheFileSize = Cache.CacheHash();
      Cache.ReMap();
   }
   else
   {
      // Map directly from the existing file
      Cache.ReMap();
      Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));
      if (Cache.VS != _system->VS)
	 return _error->Error(_("Cache has an incompatible versioning system"));
   }

   Cache.HeaderP->Dirty = true;
   Map.Sync(0,sizeof(pkgCache::Header));
   return true;
}
									/*}}}*/
// CacheGenerator::~pkgCacheGenerator - Destructor 			/*{{{*/
// ---------------------------------------------------------------------
/* We sync the data then unset the dirty flag in two steps so as to
   advoid a problem during a crash */
pkgCacheGenerator::~pkgCacheGenerator()
{
   if (_error->PendingError() == true || Map.validData() == false)
      return;
   if (Map.Sync() == false)
      return;

   Cache.HeaderP->Dirty = false;
   Cache.HeaderP->CacheFileSize = Cache.CacheHash();

   if (_config->FindB("Debug::pkgCacheGen", false))
      std::clog << "Produced cache with hash " << Cache.HeaderP->CacheFileSize << std::endl;
   Map.Sync(0,sizeof(pkgCache::Header));
}
									/*}}}*/
void pkgCacheGenerator::ReMap(void const * const oldMap, void * const newMap, size_t oldSize) {/*{{{*/
   if (oldMap == newMap)
      return;

   // Prevent multiple remaps of the same iterator. If seen.insert(iterator)
   // returns (something, true) the iterator was not yet seen and we can
   // remap it.
   std::unordered_set<void *> seen;

   if (_config->FindB("Debug::pkgCacheGen", false))
      std::clog << "Remapping from " << oldMap << " to " << newMap << std::endl;

   Cache.ReMap(false);

   if (CurrentFile != nullptr)
      CurrentFile = static_cast<pkgCache::PackageFile *>(newMap) + (CurrentFile - static_cast<pkgCache::PackageFile const *>(oldMap));
   if (CurrentRlsFile != nullptr)
      CurrentRlsFile = static_cast<pkgCache::ReleaseFile *>(newMap) + (CurrentRlsFile - static_cast<pkgCache::ReleaseFile const *>(oldMap));

#define APT_REMAP(TYPE) \
   for (auto * const i : Dynamic<TYPE>::toReMap) \
      if (seen.insert(i).second) \
	 i->ReMap(oldMap, newMap)
   APT_REMAP(pkgCache::GrpIterator);
   APT_REMAP(pkgCache::PkgIterator);
   APT_REMAP(pkgCache::VerIterator);
   APT_REMAP(pkgCache::DepIterator);
   APT_REMAP(pkgCache::DescIterator);
   APT_REMAP(pkgCache::PrvIterator);
   APT_REMAP(pkgCache::PkgFileIterator);
   APT_REMAP(pkgCache::RlsFileIterator);
#undef APT_REMAP

   for (std::string_view* ViewP : Dynamic<std::string_view>::toReMap) {
      if (std::get<1>(seen.insert(ViewP)) == false)
	 continue;
      // Ignore views outside of the cache.
      if (ViewP->data() < static_cast<const char*>(oldMap)
	 || ViewP->data() > static_cast<const char*>(oldMap) + oldSize)
	 continue;
      const char *data = ViewP->data() + (static_cast<const char*>(newMap) - static_cast<const char*>(oldMap));
      *ViewP = string_view(data , ViewP->size());
   }
}									/*}}}*/
// CacheGenerator::WriteStringInMap					/*{{{*/
map_stringitem_t pkgCacheGenerator::WriteStringInMap(const char *String,
					const unsigned long &Len) {
   size_t oldSize = Map.Size();
   void const * const oldMap = Map.Data();
   map_stringitem_t const index{NarrowOffset(Map.WriteString(String, Len))};
   if (index != 0)
      ReMap(oldMap, Map.Data(), oldSize);
   return index;
}
									/*}}}*/
// CacheGenerator::WriteStringInMap					/*{{{*/
map_stringitem_t pkgCacheGenerator::WriteStringInMap(const char *String) {
   size_t oldSize = Map.Size();
   void const * const oldMap = Map.Data();
   map_stringitem_t const index{NarrowOffset(Map.WriteString(String))};
   if (index != 0)
      ReMap(oldMap, Map.Data(), oldSize);
   return index;
}
									/*}}}*/
uint32_t pkgCacheGenerator::AllocateInMap(const unsigned long &size) {/*{{{*/
   size_t oldSize = Map.Size();
   void const * const oldMap = Map.Data();
   auto index = Map.Allocate(size);
   if (index != 0)
      ReMap(oldMap, Map.Data(), oldSize);
   if (index != static_cast<uint32_t>(index))
      abort();					// Internal error
   return static_cast<uint32_t>(index);
}
									/*}}}*/
// CacheGenerator::MergeList - Merge the package list			/*{{{*/
// ---------------------------------------------------------------------
/* This provides the generation of the entries in the cache. Each loop
   goes through a single package record from the underlying parse engine. */
bool pkgCacheGenerator::MergeList(ListParser &List,
				  pkgCache::VerIterator *OutVer)
{
   List.Owner = this;

   unsigned int Counter = 0;
   while (List.Step() == true)
   {
      string const PackageName = List.Package();
      if (PackageName.empty() == true)
	 return false;

      // Package is excluded
      if (exclude.find(PackageName) != exclude.end())
	 continue;

      // Includes are specified, this is the total set of packages to include,
      // so we need to skip the package if it is not in the include list.
      if (not include.empty() && include.find(PackageName) == include.end())
	 continue;

      Counter++;
      if (Counter % 100 == 0 && Progress != 0)
	 Progress->Progress(List.Offset());

      std::string_view Arch = List.Architecture();
      Dynamic<std::string_view> DynArch(Arch);
      std::string_view Version = List.Version();
      Dynamic<std::string_view> DynVersion(Version);
      if (Version.empty() == true && Arch.empty() == true)
      {
	 // package descriptions
	 if (MergeListGroup(List, PackageName) == false)
	    return false;
	 continue;
      }

      // Get a pointer to the package structure
      pkgCache::PkgIterator Pkg;
      Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
      if (NewPackage(Pkg, PackageName, Arch) == false)
	 // TRANSLATOR: The first placeholder is a package name,
	 // the other two should be copied verbatim as they include debug info
	 return _error->Error(_("Error occurred while processing %s (%s%d)"),
			      PackageName.c_str(), "NewPackage", 1);


      if (Version.empty() == true)
      {
	 if (MergeListPackage(List, Pkg) == false)
	    return false;
      }
      else
      {
	 if (MergeListVersion(List, Pkg, Version, OutVer) == false)
	    return false;
      }

      if (OutVer != 0)
	 return true;
   }

   if (Cache.HeaderP->PackageCount >= std::numeric_limits<map_id_t>::max())
      return _error->Error(_("Wow, you exceeded the number of package "
			     "names this APT is capable of."));
   if (Cache.HeaderP->VersionCount >= std::numeric_limits<map_id_t>::max())
      return _error->Error(_("Wow, you exceeded the number of versions "
			     "this APT is capable of."));
   if (Cache.HeaderP->DescriptionCount >= std::numeric_limits<map_id_t>::max())
      return _error->Error(_("Wow, you exceeded the number of descriptions "
			     "this APT is capable of."));
   if (Cache.HeaderP->DependsCount >= std::numeric_limits<map_id_t>::max())
      return _error->Error(_("Wow, you exceeded the number of dependencies "
			     "this APT is capable of."));

   return true;
}
// CacheGenerator::MergeListGroup					/*{{{*/
bool pkgCacheGenerator::MergeListGroup(ListParser &List, std::string const &GrpName)
{
   pkgCache::GrpIterator Grp = Cache.FindGrp(GrpName);
   // a group has no data on it's own, only packages have it but these
   // stanzas like this come from Translation- files to add descriptions,
   // but without a version we don't need a description for it…
   if (Grp.end() == true)
      return true;
   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);

   pkgCache::PkgIterator Pkg;
   Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
   for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
      if (MergeListPackage(List, Pkg) == false)
	 return false;

   return true;
}
									/*}}}*/
// CacheGenerator::MergeListPackage					/*{{{*/
bool pkgCacheGenerator::MergeListPackage(ListParser &List, pkgCache::PkgIterator &Pkg)
{
   // we first process the package, then the descriptions
   // (for deb this package processing is in fact a no-op)
   pkgCache::VerIterator Ver(Cache);
   Dynamic<pkgCache::VerIterator> DynVer(Ver);
   if (List.UsePackage(Pkg, Ver) == false)
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "UsePackage", 1);

   // Find the right version to write the description
   string_view CurMd5 = List.Description_md5();
   std::vector<std::string> availDesc = List.AvailableDescriptionLanguages();
   for (Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
   {
      pkgCache::DescIterator VerDesc = Ver.DescriptionList();

      // a version can only have one md5 describing it
      if (VerDesc.end() == true || Cache.ViewString(VerDesc->md5sum) != CurMd5)
	 continue;

      map_stringitem_t md5idx = VerDesc->md5sum;
      for (auto const &CurLang : availDesc)
      {
	 if (not AddNewDescription(List, Ver, CurLang, CurMd5, md5idx))
	    return false;
      }

      // we can stop here as all "same" versions will share the description
      break;
   }

   return true;
}
									/*}}}*/
// CacheGenerator::MergeListVersion					/*{{{*/
bool pkgCacheGenerator::MergeListVersion(ListParser &List, pkgCache::PkgIterator &Pkg,
					 std::string_view Version, pkgCache::VerIterator* &OutVer)
{
   pkgCache::VerIterator Ver = Pkg.VersionList();
   Dynamic<pkgCache::VerIterator> DynVer(Ver);
   map_pointer<pkgCache::Version> *LastVer = &Pkg->VersionList;
   void const * oldMap = Map.Data();

   auto Hash = List.VersionHash();
   std::string_view ListSHA256;
   std::string_view ListArchVariant;

   bool const Debug = _config->FindB("Debug::pkgCacheGen", false);
   auto DebList = dynamic_cast<debListParser *>(&List);
   if (DebList != nullptr)
      ListSHA256 = DebList->SHA256();
   if (DebList != nullptr)
      ListArchVariant = DebList->ArchVariant();

   auto variants = _config->FindVector("APT::Architecture-Variants");
   // Always add "no variant" at the back of the list. If it's already configured earlier, that wins
   if (variants.empty() || variants.back() != "")
      variants.push_back("");

   if (Ver.end() == false)
   {
      /* We know the list is sorted so we use that fact in the search.
         Insertion of new versions is done with correct sorting */
      int Res = 1;
      for (; Ver.end() == false; LastVer = &Ver->NextVer, ++Ver)
      {
	 char const * const VerStr = Ver.VerStr();
	 Res = Cache.VS->DoCmpVersion(Version.data(), Version.data() + Version.length(),
	       VerStr, VerStr + strlen(VerStr));
	 // Version is higher as current version - insert here
	 if (Res > 0)
	    break;
	 // Versionstrings are equal - is hash also equal?
	 if (Res == 0)
	 {
	    if (List.SameVersion(Hash, Ver))
	    {
               // We do not have SHA256 for both, so we cannot compare them, trust the call from SameVersion()
	       if (ListSHA256.empty() || Ver->ID >= VersionExtra.size() || VersionExtra[Ver->ID].SHA256[0] == 0)
		  break;
               // We have SHA256 for both, so they must match.
               if (ListSHA256 == std::string_view(VersionExtra[Ver->ID].SHA256, 64))
                  break;
	       if (Debug)
		  std::cerr << "Found differing SHA256 for " << Pkg.Name() << "=" << Version << std::endl;
	    }

	    // sort (volatile) sources above not-sources like the status file
	    if (CurrentFile == nullptr || (CurrentFile->Flags & pkgCache::Flag::NotSource) == 0)
	    {
	       auto VF = Ver.FileList();
	       for (; VF.end() == false; ++VF)
		  if (VF.File().Flagged(pkgCache::Flag::NotSource) == false)
		     break;
	       if (VF.end() == true)
		  break;
	    }

	    // Variants are ordered by their index in the variant list.
	    if (std::find(variants.begin(), variants.end(), Ver.ArchVariant()) > std::find(variants.begin(), variants.end(), ListArchVariant))
	    {
	       Res = 1;
	       break;
	    }
	 }
	 // proceed with the next till we have either the right
	 // or we found another version (which will be lower)
      }

      /* We already have a version for this item, record that we saw it */
      if (Res == 0 && Ver.end() == false && Ver->Hash == Hash)
      {
	 if (List.UsePackage(Pkg,Ver) == false)
	    return _error->Error(_("Error occurred while processing %s (%s%d)"),
				 Pkg.Name(), "UsePackage", 2);

	 if (NewFileVer(Ver,List) == false)
	    return _error->Error(_("Error occurred while processing %s (%s%d)"),
				 Pkg.Name(), "NewFileVer", 1);

	 // Read only a single record and return
	 if (OutVer != 0)
	 {
	    *OutVer = Ver;
	    return true;
	 }

	 return true;
      }
   }

   // Add a new version
   map_pointer<pkgCache::Version> const verindex = NewVersion(Ver, Version, Pkg.MapPointer(), Hash, *LastVer);
   if (unlikely(verindex == 0))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "NewVersion", 1);

   if (oldMap != Map.Data())
	 LastVer = static_cast<map_pointer<pkgCache::Version> *>(Map.Data()) + (LastVer - static_cast<map_pointer<pkgCache::Version> const *>(oldMap));
   *LastVer = verindex;
   if (ListSHA256.size() == 64)
	 memcpy(VersionExtra[Ver->ID].SHA256, ListSHA256.data(), 64);

   if (unlikely(List.NewVersion(Ver) == false))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "NewVersion", 2);

   if (unlikely(List.UsePackage(Pkg,Ver) == false))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "UsePackage", 3);

   if (unlikely(NewFileVer(Ver,List) == false))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "NewFileVer", 2);

   pkgCache::GrpIterator Grp = Pkg.Group();
   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);

   /* If it is the first version of this package we need to add implicit
      Multi-Arch dependencies to all other package versions in the group now -
      otherwise we just add them for this new version */
   if (Pkg.VersionList()->NextVer == 0)
   {
      pkgCache::PkgIterator P = Grp.PackageList();
      Dynamic<pkgCache::PkgIterator> DynP(P);
      for (; P.end() != true; P = Grp.NextPkg(P))
      {
	 if (P->ID == Pkg->ID)
	    continue;
	 pkgCache::VerIterator V = P.VersionList();
	 Dynamic<pkgCache::VerIterator> DynV(V);
	 for (; V.end() != true; ++V)
	    if (unlikely(AddImplicitDepends(V, Pkg) == false))
	       return _error->Error(_("Error occurred while processing %s (%s%d)"),
				    Pkg.Name(), "AddImplicitDepends", 1);
      }
   }
   if (unlikely(AddImplicitDepends(Grp, Pkg, Ver) == false))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
			   Pkg.Name(), "AddImplicitDepends", 2);

   // Read only a single record and return
   if (OutVer != 0)
   {
      *OutVer = Ver;
      return true;
   }

   /* Record the Description(s) based on their master md5sum */
   string_view CurMd5 = List.Description_md5();

   /* Before we add a new description we first search in the group for
      a version with a description of the same MD5 - if so we reuse this
      description group instead of creating our own for this version */
   for (pkgCache::PkgIterator P = Grp.PackageList();
	not P.end() && Ver->DescriptionList == 0; P = Grp.NextPkg(P))
   {
      for (pkgCache::VerIterator V = P.VersionList(); not V.end(); ++V)
      {
	 if (V->DescriptionList == 0 || Cache.ViewString(V.DescriptionList()->md5sum) != CurMd5)
	    continue;
	 Ver->DescriptionList = V->DescriptionList;
	 break;
      }
   }

   map_stringitem_t md5idx = Ver->DescriptionList == 0 ? 0 : Ver.DescriptionList()->md5sum;
   for (auto const &CurLang : List.AvailableDescriptionLanguages())
      if (not AddNewDescription(List, Ver, CurLang, CurMd5, md5idx))
	 return false;
   return true;
}
									/*}}}*/
// findDescription							/*{{{*/
static bool findDescription(pkgCache &Cache, pkgCache::DescIterator &Desc,
			    std::string_view CurMd5, std::string_view const CurLang)
{
   // Descriptions in the same link-list have all the same md5
   if (Desc.end() || Cache.ViewString(Desc->md5sum) != CurMd5)
      return false;
   for (; not Desc.end(); ++Desc)
      if (CurLang == Cache.ViewString(Desc->language_code))
	 return true;
   return false;
}
									/*}}}*/
bool pkgCacheGenerator::AddNewDescription(ListParser &List, pkgCache::VerIterator &Ver, std::string const &CurLang, std::string_view CurMd5, map_stringitem_t &md5idx) /*{{{*/
{
   pkgCache::DescIterator Desc = Ver.DescriptionList();
   Dynamic<pkgCache::DescIterator> DynDesc(Desc);

   // don't add a new description if we have one for the given md5 && language
   if (not findDescription(Cache, Desc, CurMd5, CurLang))
   {
      map_pointer<pkgCache::Description> const descindex = NewDescription(Desc, CurLang, CurMd5, md5idx);
      if (unlikely(descindex == 0))
	 return _error->Error(_("Error occurred while processing %s (%s%d)"),
	       Ver.ParentPkg().Name(), "NewDescription", 1);

      md5idx = Desc->md5sum;
      Desc->ParentPkg = Ver.ParentPkg().MapPointer();

      // we add at the end, so that the start is constant as we need
      // that to be able to efficiently share these lists
      if (Ver->DescriptionList == 0)
	 Ver->DescriptionList = descindex;
      else
      {
	 auto VerDesc = Ver.DescriptionList();
	 for (; VerDesc->NextDesc != 0; ++VerDesc);
	 VerDesc->NextDesc = descindex;
      }
   }

   if (not NewFileDesc(Desc, List))
      return _error->Error(_("Error occurred while processing %s (%s%d)"),
	    Ver.ParentPkg().Name(), "NewFileDesc", 1);

   return true;
}
									/*}}}*/
									/*}}}*/
// CacheGenerator::NewGroup - Add a new group				/*{{{*/
// ---------------------------------------------------------------------
/* This creates a new group structure and adds it to the hash table */
bool pkgCacheGenerator::NewGroup(pkgCache::GrpIterator &Grp, string_view Name)
{
   Dynamic<string_view> DName(Name);
   Grp = Cache.FindGrp(Name);
   if (Grp.end() == false)
      return true;

   // Get a structure
   auto const Group = AllocateInMap<pkgCache::Group>();
   if (unlikely(Group == 0))
      return false;

   map_stringitem_t const idxName = WriteStringInMap(Name);
   if (unlikely(idxName == 0))
      return false;

   Grp = pkgCache::GrpIterator(Cache, Cache.GrpP + Group);
   Grp->Name = idxName;

   // Insert it into the hash table
   unsigned long const Hash = Cache.Hash(Name);
   map_pointer<pkgCache::Group> *insertAt = &Cache.HeaderP->GrpHashTableP()[Hash];

   while (*insertAt != 0 && StringViewCompareFast(Name, Cache.ViewString((Cache.GrpP + *insertAt)->Name)) > 0)
      insertAt = &(Cache.GrpP + *insertAt)->Next;
   Grp->Next = *insertAt;
   *insertAt = Group;

   Grp->ID = Cache.HeaderP->GroupCount++;
   return true;
}
									/*}}}*/
// CacheGenerator::NewPackage - Add a new package			/*{{{*/
// ---------------------------------------------------------------------
/* This creates a new package structure and adds it to the hash table */
bool pkgCacheGenerator::NewPackage(pkgCache::PkgIterator &Pkg, string_view Name,
					string_view Arch) {
   pkgCache::GrpIterator Grp;
   Dynamic<string_view> DName(Name);
   Dynamic<string_view> DArch(Arch);
   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
   if (unlikely(NewGroup(Grp, Name) == false))
      return false;

   Pkg = Grp.FindPkg(Arch);
      if (Pkg.end() == false)
	 return true;

   // Get a structure
   auto const Package = AllocateInMap<pkgCache::Package>();
   if (unlikely(Package == 0))
      return false;
   Pkg = pkgCache::PkgIterator(Cache,Cache.PkgP + Package);

   // Set the name, arch and the ID
   Pkg->Group = Grp.MapPointer();
   // all is mapped to the native architecture
   map_stringitem_t const idxArch = (Arch == "all") ? Cache.HeaderP->Architecture : StoreString(MIXED, Arch);
   if (unlikely(idxArch == 0))
      return false;
   Pkg->Arch = idxArch;
   Pkg->ID = Cache.HeaderP->PackageCount++;

   // Insert the package into our package list
   if (Grp->FirstPackage == 0) // the group is new
   {
      Grp->FirstPackage = Package;
      // Insert it into the hash table
      map_id_t const Hash = Cache.Hash(Name);
      map_pointer<pkgCache::Package> *insertAt = &Cache.HeaderP->PkgHashTableP()[Hash];
      while (*insertAt != 0 && StringViewCompareFast(Name, Cache.ViewString((Cache.GrpP + (Cache.PkgP + *insertAt)->Group)->Name)) > 0)
	 insertAt = &(Cache.PkgP + *insertAt)->NextPackage;
      Pkg->NextPackage = *insertAt;
      *insertAt = Package;
   }
   else // Group the Packages together
   {
      // if sibling is provided by another package, this one is too
      {
	 pkgCache::PkgIterator const M = Grp.FindPreferredPkg(false); // native or any foreign pkg will do
	 if (M.end() == false) {
	    pkgCache::PrvIterator Prv;
	    pkgCache::VerIterator Ver;
	    Dynamic<pkgCache::PrvIterator> DynPrv(Prv);
	    Dynamic<pkgCache::VerIterator> DynVer(Ver);
	    for (Prv = M.ProvidesList(); Prv.end() == false; ++Prv)
	    {
	       if ((Prv->Flags & pkgCache::Flag::ArchSpecific) != 0)
		  continue;
	       Ver = Prv.OwnerVer();
	       if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign &&
		   (Prv->Flags & pkgCache::Flag::MultiArchImplicit) == 0)
	       {
		  if (APT::Configuration::checkArchitecture(Ver.ParentPkg().Arch()) == false)
		     continue;
		  if (NewProvides(Ver, Pkg, Prv->ProvideVersion, Prv->Flags) == false)
		     return false;
	       }
	    }
	 }
      }
      // let M-A:foreign package siblings provide this package
      {
	 pkgCache::PkgIterator P;
	 pkgCache::VerIterator Ver;
	 Dynamic<pkgCache::PkgIterator> DynP(P);
	 Dynamic<pkgCache::VerIterator> DynVer(Ver);

	 for (P = Grp.PackageList(); P.end() == false;  P = Grp.NextPkg(P))
	 {
	    if (APT::Configuration::checkArchitecture(P.Arch()) == false)
	       continue;
	    for (Ver = P.VersionList(); Ver.end() == false; ++Ver)
	       if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign)
		  if (NewProvides(Ver, Pkg, Ver->VerStr, pkgCache::Flag::MultiArchImplicit) == false)
		     return false;
	 }
      }
      // and negative dependencies, don't forget negative dependencies
      {
	 pkgCache::PkgIterator const M = Grp.FindPreferredPkg(false);
	 if (M.end() == false) {
	    pkgCache::DepIterator Dep;
	    Dynamic<pkgCache::DepIterator> DynDep(Dep);
	    for (Dep = M.RevDependsList(); Dep.end() == false; ++Dep)
	    {
	       if ((Dep->CompareOp & (pkgCache::Dep::ArchSpecific | pkgCache::Dep::MultiArchImplicit)) != 0)
		  continue;
	       if (Dep->Type != pkgCache::Dep::DpkgBreaks && Dep->Type != pkgCache::Dep::Conflicts &&
		     Dep->Type != pkgCache::Dep::Replaces)
		  continue;
	       pkgCache::VerIterator Ver = Dep.ParentVer();
	       Dynamic<pkgCache::VerIterator> DynVer(Ver);
	       map_pointer<pkgCache::Dependency> * unused = NULL;
	       if (NewDepends(Pkg, Ver, Dep->Version, Dep->CompareOp, Dep->Type, unused) == false)
		  return false;
	    }
	 }
      }

      // this package is the new last package
      pkgCache::PkgIterator LastPkg(Cache, Cache.PkgP + Grp->LastPackage);
      Pkg->NextPackage = LastPkg->NextPackage;
      LastPkg->NextPackage = Package;
   }
   Grp->LastPackage = Package;

   // lazy-create foo (of amd64) provides foo:amd64 at the time we first need it
   if (Arch == "any")
   {
      size_t const found = Name.rfind(':');
      string_view ArchA = Name.substr(found + 1);
      if (ArchA != "any")
      {
	 // ArchA is used inside the loop which might remap (NameA is not used)
	 Dynamic<string_view> DynArchA(ArchA);
	 string_view NameA = Name.substr(0, found);
	 pkgCache::PkgIterator PkgA = Cache.FindPkg(NameA, ArchA);
	 Dynamic<pkgCache::PkgIterator> DynPkgA(PkgA);
	 if (PkgA.end())
	 {
	    Dynamic<string_view> DynNameA(NameA);
	    if (NewPackage(PkgA, NameA, ArchA) == false)
	       return false;
	 }
	 if (unlikely(PkgA.end()))
	    return _error->Fatal("NewPackage was successful for %.*s:%.*s,"
		  "but the package doesn't exist anyhow!",
		  (int)NameA.size(), NameA.data(), (int)ArchA.size(), ArchA.data());
	 else
	 {
	    pkgCache::PrvIterator Prv = PkgA.ProvidesList();
	    for (; Prv.end() == false; ++Prv)
	    {
	       if (Prv.IsMultiArchImplicit())
		  continue;
	       pkgCache::VerIterator V = Prv.OwnerVer();
	       if (ArchA != V.ParentPkg().Arch())
		  continue;
	       if (NewProvides(V, Pkg, Prv->ProvideVersion, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
		  return false;
	    }
	    pkgCache::VerIterator V = PkgA.VersionList();
	    Dynamic<pkgCache::VerIterator> DynV(V);
	    for (; V.end() == false; ++V)
	    {
	       if (NewProvides(V, Pkg, V->VerStr, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
		  return false;
	    }
	 }
      }
   }
   return true;
}
									/*}}}*/
// CacheGenerator::AddImplicitDepends					/*{{{*/
bool pkgCacheGenerator::AddImplicitDepends(pkgCache::GrpIterator &G,
					   pkgCache::PkgIterator &P,
					   pkgCache::VerIterator &V)
{
   std::string_view Arch = P.Arch() == NULL ? "" : P.Arch();
   Dynamic<std::string_view> DynArch(Arch);
   map_pointer<pkgCache::Dependency> *OldDepLast = NULL;
   /* MultiArch handling introduces a lot of implicit Dependencies:
      - MultiArch: same → Co-Installable if they have the same version
      - All others conflict with all other group members */
   bool const coInstall = ((V->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same);
   pkgCache::PkgIterator D = G.PackageList();
   Dynamic<pkgCache::PkgIterator> DynD(D);
   map_stringitem_t const VerStrIdx = V->VerStr;
   for (; D.end() != true; D = G.NextPkg(D))
   {
      if (Arch == D.Arch() || D->VersionList == 0)
	 continue;
      /* We allow only one installed arch at the time
	 per group, therefore each group member conflicts
	 with all other group members */
      if (coInstall == true)
      {
	 // Replaces: ${self}:other ( << ${binary:Version})
	 NewDepends(D, V, VerStrIdx,
		    pkgCache::Dep::Less | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Replaces,
		    OldDepLast);
	 // Breaks: ${self}:other (!= ${binary:Version})
	 NewDepends(D, V, VerStrIdx,
		    pkgCache::Dep::NotEquals | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::DpkgBreaks,
		    OldDepLast);
      } else {
	 // Conflicts: ${self}:other
	 NewDepends(D, V, 0,
		    pkgCache::Dep::NoOp | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Conflicts,
		    OldDepLast);
      }
   }
   return true;
}
bool pkgCacheGenerator::AddImplicitDepends(pkgCache::VerIterator &V,
					   pkgCache::PkgIterator &D)
{
   /* MultiArch handling introduces a lot of implicit Dependencies:
      - MultiArch: same → Co-Installable if they have the same version
      - All others conflict with all other group members */
   map_pointer<pkgCache::Dependency> *OldDepLast = NULL;
   bool const coInstall = ((V->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same);
   if (coInstall == true)
   {
      map_stringitem_t const VerStrIdx = V->VerStr;
      // Replaces: ${self}:other ( << ${binary:Version})
      NewDepends(D, V, VerStrIdx,
		 pkgCache::Dep::Less | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Replaces,
		 OldDepLast);
      // Breaks: ${self}:other (!= ${binary:Version})
      NewDepends(D, V, VerStrIdx,
		 pkgCache::Dep::NotEquals | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::DpkgBreaks,
		 OldDepLast);
   } else {
      // Conflicts: ${self}:other
      NewDepends(D, V, 0,
		 pkgCache::Dep::NoOp | pkgCache::Dep::MultiArchImplicit, pkgCache::Dep::Conflicts,
		 OldDepLast);
   }
   return true;
}

									/*}}}*/
// CacheGenerator::NewFileVer - Create a new File<->Version association	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgCacheGenerator::NewFileVer(pkgCache::VerIterator &Ver,
				   ListParser &List)
{
   if (CurrentFile == nullptr)
      return true;

   // Get a structure
   auto const VerFile = AllocateInMap<pkgCache::VerFile>();
   if (VerFile == 0)
      return false;

   pkgCache::VerFileIterator VF(Cache,Cache.VerFileP + VerFile);
   VF->File = map_pointer<pkgCache::PackageFile>{NarrowOffset(CurrentFile - Cache.PkgFileP)};

   // Link it to the end of the list
   map_pointer<pkgCache::VerFile> *Last = &Ver->FileList;
   for (pkgCache::VerFileIterator V = Ver.FileList(); V.end() == false; ++V)
      Last = &V->NextFile;
   VF->NextFile = *Last;
   *Last = VF.MapPointer();

   VF->Offset = List.Offset();
   auto const Size = List.Size();
   if (Cache.HeaderP->MaxVerFileSize < Size)
      Cache.HeaderP->MaxVerFileSize = Size;
   Cache.HeaderP->VerFileCount++;

   return true;
}
									/*}}}*/
// CacheGenerator::NewVersion - Create a new Version 			/*{{{*/
// ---------------------------------------------------------------------
/* This puts a version structure in the linked list */
map_pointer<pkgCache::Version> pkgCacheGenerator::NewVersion(pkgCache::VerIterator &Ver,
					    std::string_view VerStr,
					    map_pointer<pkgCache::Package> const ParentPkg,
					    uint32_t Hash,
					    map_pointer<pkgCache::Version> const Next)
{
   // Get a structure
   auto const Version = AllocateInMap<pkgCache::Version>();
   if (Version == 0)
      return 0;

   // Fill it in
   Ver = pkgCache::VerIterator(Cache,Cache.VerP + Version);
   auto d = AllocateInMap<pkgCache::Version::Extra>(); // sequence point so Ver can be moved if needed
   Ver->d = d;
   if (not Ver.PhasedUpdatePercentage(100))
      abort();
   auto SourceVersion = AllocateInMap<pkgCache::SourceVersion>(); // sequence point so Ver can be moved if needed
   Ver->SourceVersion = SourceVersion;
   Ver.SourceVersion()->ID = Cache.HeaderP->SourceVersionCount++;
   if (not Ver.SourceVersion())
      abort();

   //Dynamic<pkgCache::VerIterator> DynV(Ver); // caller MergeListVersion already takes care of it
   Ver->NextVer = Next;
   Ver->ParentPkg = ParentPkg;
   Ver->Hash = Hash;
   Ver->ID = Cache.HeaderP->VersionCount++;

   // Allocate size for extra store
   if (VersionExtra.size() <= Ver->ID)
      VersionExtra.resize(Ver->ID + 1);

   // try to find the version string in the group for reuse
   pkgCache::PkgIterator Pkg = Ver.ParentPkg();
   pkgCache::GrpIterator Grp = Pkg.Group();
   if (Pkg.end() == false && Grp.end() == false)
   {
      for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
      {
	 if (Pkg == P)
	    continue;
	 for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; ++V)
	 {
	    int const cmp = strncmp(V.VerStr(), VerStr.data(), VerStr.length());
	    if (cmp == 0 && V.VerStr()[VerStr.length()] == '\0')
	    {
	       Ver->VerStr = V->VerStr;
	       return Version;
	    }
	    else if (cmp < 0)
	       break;
	 }
      }
   }
   // haven't found the version string, so create
   map_stringitem_t const idxVerStr = StoreString(VERSIONNUMBER, VerStr);
   if (unlikely(idxVerStr == 0))
      return 0;
   Ver->VerStr = idxVerStr;
   return Version;
}
									/*}}}*/
// CacheGenerator::NewFileDesc - Create a new File<->Desc association	/*{{{*/
bool pkgCacheGenerator::NewFileDesc(pkgCache::DescIterator &Desc,
				   ListParser &List)
{
   if (CurrentFile == nullptr)
      return true;

   auto const DFFile = map_pointer<pkgCache::PackageFile>{NarrowOffset(CurrentFile - Cache.PkgFileP)};
   auto const DFOffset = List.Offset();
   for (auto DF = Desc.FileList(); not DF.end(); ++DF)
      if (DF->File == DFFile && DF->Offset == DFOffset)
	 return true;

   // Get a structure
   auto const DescFile = AllocateInMap<pkgCache::DescFile>();
   if (DescFile == 0)
      return false;

   pkgCache::DescFileIterator DF(Cache,Cache.DescFileP + DescFile);
   DF->File = DFFile;
   DF->Offset = DFOffset;

   // Link it to the end of the list
   if (Desc->FileList == 0)
      Desc->FileList = DescFile;
   else
   {
      auto Last = Desc.FileList();
      for (; Last->NextFile != 0; ++Last);
      Last->NextFile = DescFile;
   }

   auto const Size = List.Size();
   if (Cache.HeaderP->MaxDescFileSize < Size)
      Cache.HeaderP->MaxDescFileSize = Size;
   Cache.HeaderP->DescFileCount++;

   return true;
}
									/*}}}*/
// CacheGenerator::NewDescription - Create a new Description		/*{{{*/
// ---------------------------------------------------------------------
/* This puts a description structure in the linked list */
map_pointer<pkgCache::Description> pkgCacheGenerator::NewDescription(pkgCache::DescIterator &Desc,
					    const string &Lang,
					    std::string_view md5sum,
					    map_stringitem_t const idxmd5str)
{
   // Get a structure
   auto const Description = AllocateInMap<pkgCache::Description>();
   if (Description == 0)
      return 0;

   // Fill it in
   Desc = pkgCache::DescIterator(Cache,Cache.DescP + Description);
   Desc->ID = Cache.HeaderP->DescriptionCount++;
   map_stringitem_t const idxlanguage_code = StoreString(MIXED, Lang);
   if (unlikely(idxlanguage_code == 0))
      return 0;
   Desc->language_code = idxlanguage_code;

   if (idxmd5str != 0)
      Desc->md5sum = idxmd5str;
   else
   {
      map_stringitem_t const idxmd5sum = WriteStringInMap(md5sum);
      if (unlikely(idxmd5sum == 0))
	 return 0;
      Desc->md5sum = idxmd5sum;
   }

   return Description;
}
									/*}}}*/
// CacheGenerator::NewDepends - Create a dependency element		/*{{{*/
// ---------------------------------------------------------------------
/* This creates a dependency element in the tree. It is linked to the
   version and to the package that it is pointing to. */
bool pkgCacheGenerator::NewDepends(pkgCache::PkgIterator &Pkg,
				   pkgCache::VerIterator &Ver,
				   map_stringitem_t const Version,
				   uint8_t const Op,
				   uint8_t const Type,
				   map_pointer<pkgCache::Dependency> * &OldDepLast)
{
   void const * const oldMap = Map.Data();
   // Get a structure
   auto const Dependency = AllocateInMap<pkgCache::Dependency>();
   if (unlikely(Dependency == 0))
      return false;

   bool isDuplicate = false;
   map_pointer<pkgCache::DependencyData> DependencyData = 0;
   map_pointer<pkgCache::DependencyData> PreviousData = 0;
   if (Pkg->RevDepends != 0)
   {
      pkgCache::Dependency const * const L = Cache.DepP + Pkg->RevDepends;
      DependencyData = L->DependencyData;
      do {
	 pkgCache::DependencyData const * const D = Cache.DepDataP + DependencyData;
	 if (Version > D->Version)
	    break;
	 if (D->Version == Version && D->Type == Type && D->CompareOp == Op)
	 {
	    isDuplicate = true;
	    break;
	 }
	 PreviousData = DependencyData;
	 DependencyData = D->NextData;
      } while (DependencyData != 0);
   }

   if (isDuplicate == false)
   {
      DependencyData = AllocateInMap<pkgCache::DependencyData>();
      if (unlikely(DependencyData == 0))
        return false;
   }

   pkgCache::Dependency * Link = Cache.DepP + Dependency;
   Link->ParentVer = Ver.MapPointer();
   Link->DependencyData = DependencyData;
   Link->ID = Cache.HeaderP->DependsCount++;

   pkgCache::DepIterator Dep(Cache, Link);
   if (isDuplicate == false)
   {
      Dep->Type = Type;
      Dep->CompareOp = Op;
      Dep->Version = Version;
      Dep->Package = Pkg.MapPointer();
      ++Cache.HeaderP->DependsDataCount;
      if (PreviousData != 0)
      {
	 pkgCache::DependencyData * const D = Cache.DepDataP + PreviousData;
	 Dep->NextData = D->NextData;
	 D->NextData = DependencyData;
      }
      else if (Pkg->RevDepends != 0)
      {
	 pkgCache::Dependency const * const D = Cache.DepP + Pkg->RevDepends;
	 Dep->NextData = D->DependencyData;
      }
   }

   if (isDuplicate == true || PreviousData != 0)
   {
      pkgCache::Dependency * const L = Cache.DepP + Pkg->RevDepends;
      Link->NextRevDepends = L->NextRevDepends;
      L->NextRevDepends = Dependency;
   }
   else
   {
      Link->NextRevDepends = Pkg->RevDepends;
      Pkg->RevDepends = Dependency;
   }


   // Do we know where to link the Dependency to?
   if (OldDepLast == NULL)
   {
      OldDepLast = &Ver->DependsList;
      for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false; ++D)
	 OldDepLast = &D->NextDepends;
   } else if (oldMap != Map.Data())
      OldDepLast = static_cast<map_pointer<pkgCache::Dependency> *>(Map.Data()) + (OldDepLast - static_cast<map_pointer<pkgCache::Dependency> const *>(oldMap));

   Dep->NextDepends = *OldDepLast;
   *OldDepLast = Dependency;
   OldDepLast = &Dep->NextDepends;
   return true;
}
									/*}}}*/
// ListParser::NewDepends - Create the environment for a new dependency	/*{{{*/
// ---------------------------------------------------------------------
/* This creates a Group and the Package to link this dependency to if
   needed and handles also the caching of the old endpoint */
bool pkgCacheListParser::NewDepends(pkgCache::VerIterator &Ver,
					       string_view PackageName,
					       string_view Arch,
					       string_view Version,
					       uint8_t const Op,
					       uint8_t const Type)
{
   pkgCache::GrpIterator Grp;
   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
   Dynamic<string_view> DynPackageName(PackageName);
   Dynamic<string_view> DynArch(Arch);
   Dynamic<string_view> DynVersion(Version);
   if (unlikely(Owner->NewGroup(Grp, PackageName) == false))
      return false;

   map_stringitem_t idxVersion = 0;
   if (Version.empty() == false)
   {
      int const CmpOp = Op & 0x0F;
      // =-deps are used (79:1) for lockstep on same-source packages (e.g. data-packages)
      if (CmpOp == pkgCache::Dep::Equals && Version == Ver.VerStr())
	 idxVersion = Ver->VerStr;

      if (idxVersion == 0)
      {
	 idxVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
	 if (unlikely(idxVersion == 0))
	    return false;
      }
   }

   bool const isNegative = (Type == pkgCache::Dep::DpkgBreaks ||
	 Type == pkgCache::Dep::Conflicts ||
	 Type == pkgCache::Dep::Replaces);

   pkgCache::PkgIterator Pkg;
   Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
   if (isNegative == false || (Op & pkgCache::Dep::ArchSpecific) == pkgCache::Dep::ArchSpecific || Grp->FirstPackage == 0)
   {
      // Locate the target package
      Pkg = Grp.FindPkg(Arch);
      if (Pkg.end() == true) {
	 if (unlikely(Owner->NewPackage(Pkg, PackageName, Arch) == false))
	    return false;
      }

      /* Caching the old end point speeds up generation substantially */
      if (OldDepVer != Ver) {
	 OldDepLast = NULL;
	 OldDepVer = Ver;
      }

      return Owner->NewDepends(Pkg, Ver, idxVersion, Op, Type, OldDepLast);
   }
   else
   {
      /* Caching the old end point speeds up generation substantially */
      if (OldDepVer != Ver) {
	 OldDepLast = NULL;
	 OldDepVer = Ver;
      }

      for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
      {
	 if (Owner->NewDepends(Pkg, Ver, idxVersion, Op, Type, OldDepLast) == false)
	       return false;
      }
   }
   return true;
}
									/*}}}*/
// ListParser::NewProvides - Create a Provides element			/*{{{*/
bool pkgCacheListParser::NewProvides(pkgCache::VerIterator &Ver,
						string_view PkgName,
						string_view PkgArch,
						string_view Version,
						uint8_t const Flags)
{
   pkgCache const &Cache = Owner->Cache;
   Dynamic<string_view> DynPkgName(PkgName);
   Dynamic<string_view> DynArch(PkgArch);
   Dynamic<string_view> DynVersion(Version);

   // We do not add self referencing provides
   if (string_view{Ver.ParentPkg().Name()} == PkgName && (PkgArch == Ver.ParentPkg().Arch() ||
	(PkgArch == "all" && strcmp((Cache.StrP + Cache.HeaderP->Architecture), Ver.ParentPkg().Arch()) == 0)) &&
	 (Version.empty() || Version == Ver.VerStr()))
      return true;

   // Locate the target package
   pkgCache::PkgIterator Pkg;
   Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
   if (unlikely(Owner->NewPackage(Pkg,PkgName, PkgArch) == false))
      return false;

   map_stringitem_t idxProvideVersion = 0;
   if (Version.empty() == false) {
      idxProvideVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
      if (unlikely(idxProvideVersion == 0))
	 return false;
   }
   return Owner->NewProvides(Ver, Pkg, idxProvideVersion, Flags);
}
bool pkgCacheGenerator::NewProvides(pkgCache::VerIterator &Ver,
				    pkgCache::PkgIterator &Pkg,
				    map_stringitem_t const ProvideVersion,
				    uint8_t const Flags)
{
   // Get a structure
   auto const Provides = AllocateInMap<pkgCache::Provides>();
   if (unlikely(Provides == 0))
      return false;
   ++Cache.HeaderP->ProvidesCount;

   // Fill it in
   pkgCache::PrvIterator Prv(Cache,Cache.ProvideP + Provides,Cache.PkgP);
   Prv->Version = Ver.MapPointer();
   Prv->ProvideVersion = ProvideVersion;
   Prv->Flags = Flags;
   Prv->NextPkgProv = Ver->ProvidesList;
   Ver->ProvidesList = Prv.MapPointer();

   // Link it to the package
   Prv->ParentPkg = Pkg.MapPointer();
   Prv->NextProvides = Pkg->ProvidesList;
   Pkg->ProvidesList = Prv.MapPointer();
   return true;
}
									/*}}}*/
// ListParser::NewProvidesAllArch - add provides for all architectures	/*{{{*/
bool pkgCacheListParser::NewProvidesAllArch(pkgCache::VerIterator &Ver, string_view Package,
				string_view Version, uint8_t const Flags) {
   pkgCache &Cache = Owner->Cache;
   pkgCache::GrpIterator Grp = Cache.FindGrp(Package);
   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
   Dynamic<string_view> DynPackage(Package);
   Dynamic<string_view> DynVersion(Version);

   if (Grp.end() == true || Grp->FirstPackage == 0)
      return NewProvides(Ver, Package, Cache.NativeArch(), Version, Flags);
   else
   {
      map_stringitem_t idxProvideVersion = 0;
      if (Version.empty() == false) {
	 idxProvideVersion = StoreString(pkgCacheGenerator::VERSIONNUMBER, Version);
	 if (unlikely(idxProvideVersion == 0))
	    return false;
      }

      bool const isImplicit = (Flags & pkgCache::Flag::MultiArchImplicit) == pkgCache::Flag::MultiArchImplicit;
      bool const isArchSpecific = (Flags & pkgCache::Flag::ArchSpecific) == pkgCache::Flag::ArchSpecific;
      pkgCache::PkgIterator OwnerPkg = Ver.ParentPkg();
      Dynamic<pkgCache::PkgIterator> DynOwnerPkg(OwnerPkg);
      pkgCache::PkgIterator Pkg;
      Dynamic<pkgCache::PkgIterator> DynPkg(Pkg);
      for (Pkg = Grp.PackageList(); Pkg.end() == false; Pkg = Grp.NextPkg(Pkg))
      {
	 if (isImplicit && OwnerPkg == Pkg)
	    continue;
	 if (isArchSpecific == false && APT::Configuration::checkArchitecture(OwnerPkg.Arch()) == false)
	    continue;
	 if (Owner->NewProvides(Ver, Pkg, idxProvideVersion, Flags) == false)
	    return false;
      }
   }
   return true;
}
									/*}}}*/
bool pkgCacheListParser::SameVersion(uint32_t Hash,		/*{{{*/
      pkgCache::VerIterator const &Ver)
{
   return Hash == Ver->Hash;
}
									/*}}}*/
// CacheGenerator::SelectReleaseFile - Select the current release file the indexes belong to	/*{{{*/
bool pkgCacheGenerator::SelectReleaseFile(const string &File,const string &Site,
				   unsigned long Flags)
{
   CurrentRlsFile = nullptr;
   if (File.empty() && Site.empty())
      return true;

   // Get some space for the structure
   auto const idxFile = AllocateInMap<pkgCache::ReleaseFile>();
   if (unlikely(idxFile == 0))
      return false;
   CurrentRlsFile = Cache.RlsFileP + idxFile;

   // Fill it in
   map_stringitem_t const idxFileName = WriteStringInMap(File);
   map_stringitem_t const idxSite = StoreString(MIXED, Site);
   if (unlikely(idxFileName == 0 || idxSite == 0))
      return false;
   CurrentRlsFile->FileName = idxFileName;
   CurrentRlsFile->Site = idxSite;
   CurrentRlsFile->NextFile = Cache.HeaderP->RlsFileList;
   CurrentRlsFile->Flags = Flags;
   CurrentRlsFile->ID = Cache.HeaderP->ReleaseFileCount;
   RlsFileName = File;
   Cache.HeaderP->RlsFileList = map_pointer<pkgCache::ReleaseFile>{NarrowOffset(CurrentRlsFile - Cache.RlsFileP)};
   Cache.HeaderP->ReleaseFileCount++;

   return true;
}
									/*}}}*/
// CacheGenerator::SelectFile - Select the current file being parsed	/*{{{*/
// ---------------------------------------------------------------------
/* This is used to select which file is to be associated with all newly
   added versions. The caller is responsible for setting the IMS fields. */
bool pkgCacheGenerator::SelectFile(std::string const &File,
				   pkgIndexFile const &Index,
				   std::string const &Architecture,
				   std::string const &Component,
				   const IndexTarget *Target,
				   unsigned long const Flags)
{
   CurrentFile = nullptr;
   // Get some space for the structure
   auto const idxFile = AllocateInMap<pkgCache::PackageFile>();
   if (unlikely(idxFile == 0))
      return false;
   CurrentFile = Cache.PkgFileP + idxFile;

   // Fill it in
   map_stringitem_t const idxFileName = WriteStringInMap(File);
   if (unlikely(idxFileName == 0))
      return false;
   CurrentFile->FileName = idxFileName;
   CurrentFile->NextFile = Cache.HeaderP->FileList;
   CurrentFile->ID = Cache.HeaderP->PackageFileCount;
   map_stringitem_t const idxIndexType = StoreString(MIXED, Index.GetType()->Label);
   if (unlikely(idxIndexType == 0))
      return false;
   CurrentFile->IndexType = idxIndexType;
   if (Architecture.empty())
      CurrentFile->Architecture = 0;
   else
   {
      map_stringitem_t const arch = StoreString(pkgCacheGenerator::MIXED, Architecture);
      if (unlikely(arch == 0))
	 return false;
      CurrentFile->Architecture = arch;
   }
   map_stringitem_t const component = StoreString(pkgCacheGenerator::MIXED, Component);
   if (unlikely(component == 0))
      return false;
   CurrentFile->Component = component;
   CurrentFile->Flags = Flags;
   if (CurrentRlsFile != nullptr)
      CurrentFile->Release = map_pointer<pkgCache::ReleaseFile>{NarrowOffset(CurrentRlsFile - Cache.RlsFileP)};
   else
      CurrentFile->Release = 0;
   PkgFileName = File;
   Cache.HeaderP->FileList = map_pointer<pkgCache::PackageFile>{NarrowOffset(CurrentFile - Cache.PkgFileP)};
   Cache.HeaderP->PackageFileCount++;

   include.clear();
   exclude.clear();
   if (Target)
   {
      if (auto inc = Target->Options.find("INCLUDE"); inc != Target->Options.end())
      {
	 auto v = VectorizeString(inc->second, ' ');
	 include.insert(v.begin(), v.end());
      }
      if (auto exc = Target->Options.find("EXCLUDE"); exc != Target->Options.end())
      {
	 auto v = VectorizeString(exc->second, ' ');
	 exclude.insert(v.begin(), v.end());
      }
   }

   if (Progress != 0)
      Progress->SubProgress(Index.Size());
   return true;
}
									/*}}}*/
// CacheGenerator::WriteUniqueString - Insert a unique string		/*{{{*/
// ---------------------------------------------------------------------
/* This is used to create handles to strings. Given the same text it
   always returns the same number */
map_stringitem_t pkgCacheGenerator::StoreString(enum StringType const type, const char *S,
						 unsigned int Size)
{
   auto strings = &strMixed;
   switch(type) {
      case MIXED: strings = &strMixed; break;
      case VERSIONNUMBER: strings = &strVersions; break;
      case SECTION: strings = &strSections; break;
      default: _error->Fatal("Unknown enum type used for string storage of '%.*s'", Size, S); return 0;
   }

   auto const item = strings->find({S, Size, nullptr, 0});
   if (item != strings->end())
      return item->item;

   map_stringitem_t const idxString = WriteStringInMap(S,Size);
   strings->insert({nullptr, Size, this, idxString});
   return idxString;
}
									/*}}}*/
// CheckValidity - Check that a cache is up-to-date			/*{{{*/
// ---------------------------------------------------------------------
/* This just verifies that each file in the list of index files exists,
   has matching attributes with the cache and the cache does not have
   any extra files. */
class APT_HIDDEN ScopedErrorRevert {
public:
   ScopedErrorRevert() { _error->PushToStack(); }
   ~ScopedErrorRevert() { _error->RevertToStack(); }
};

static bool CheckValidity(FileFd &CacheFile, std::string const &CacheFileName,
                          pkgSourceList &List,
                          FileIterator const Start,
                          FileIterator const End,
                          MMap **OutMap = 0,
			  pkgCache **OutCache = 0)
{
   if (CacheFileName.empty())
      return false;
   ScopedErrorRevert ser;

   bool const Debug = _config->FindB("Debug::pkgCacheGen", false);
   // No file, certainly invalid
   if (CacheFile.Open(CacheFileName, FileFd::ReadOnly, FileFd::None) == false)
   {
      if (Debug == true)
	 std::clog << "CacheFile " << CacheFileName << " doesn't exist" << std::endl;
      return false;
   }

   if (_config->FindI("APT::Cache-Start", 0) == 0)
   {
      auto const size = CacheFile.FileSize();
      if (std::numeric_limits<int>::max() >= size && size > APT_CACHE_START_DEFAULT)
	 _config->Set("APT::Cache-Start", size);
   }

   if (List.GetLastModifiedTime() > CacheFile.ModificationTime())
   {
      if (Debug == true)
	 std::clog << "sources.list is newer than the cache" << std::endl;
      return false;
   }

   // Map it
   std::unique_ptr<MMap> Map(new MMap(CacheFile,0));
   if (unlikely(Map->validData()) == false)
      return false;
   std::unique_ptr<pkgCache> CacheP(new pkgCache(Map.get()));
   pkgCache &Cache = *CacheP.get();
   if (_error->PendingError() || Map->Size() == 0)
   {
      if (Debug == true)
	 std::clog << "Errors are pending or Map is empty() for " << CacheFileName << std::endl;
      return false;
   }

   std::unique_ptr<bool[]> RlsVisited(new bool[Cache.HeaderP->ReleaseFileCount]);
   memset(RlsVisited.get(),0,sizeof(RlsVisited[0])*Cache.HeaderP->ReleaseFileCount);
   std::vector<pkgIndexFile *> Files;
   for (pkgSourceList::const_iterator i = List.begin(); i != List.end(); ++i)
   {
      if (Debug == true)
	 std::clog << "Checking RlsFile " << (*i)->Describe() << ": ";
      pkgCache::RlsFileIterator const RlsFile = (*i)->FindInCache(Cache, true);
      if (RlsFile.end() == true)
      {
	 if (Debug == true)
	    std::clog << "FindInCache returned end-Pointer" << std::endl;
	 return false;
      }

      RlsVisited[RlsFile->ID] = true;
      if (Debug == true)
	 std::clog << "with ID " << RlsFile->ID << " is valid" << std::endl;

      std::vector <pkgIndexFile *> const * const Indexes = (*i)->GetIndexFiles();
      std::copy_if(Indexes->begin(), Indexes->end(), std::back_inserter(Files),
	    [](pkgIndexFile const * const I) { return I->HasPackages(); });
   }
   for (unsigned I = 0; I != Cache.HeaderP->ReleaseFileCount; ++I)
      if (RlsVisited[I] == false)
      {
	 if (Debug == true)
	    std::clog << "RlsFile with ID" << I << " wasn't visited" << std::endl;
	 return false;
      }

   std::copy(Start, End, std::back_inserter(Files));

   /* Now we check every index file, see if it is in the cache,
      verify the IMS data and check that it is on the disk too.. */
   std::unique_ptr<bool[]> Visited(new bool[Cache.HeaderP->PackageFileCount]);
   memset(Visited.get(),0,sizeof(Visited[0])*Cache.HeaderP->PackageFileCount);
   for (std::vector<pkgIndexFile *>::const_reverse_iterator PkgFile = Files.rbegin(); PkgFile != Files.rend(); ++PkgFile)
   {
      if (Debug == true)
	 std::clog << "Checking PkgFile " << (*PkgFile)->Describe() << ": ";
      if ((*PkgFile)->Exists() == false)
      {
         if (Debug == true)
	    std::clog << "file doesn't exist" << std::endl;
	 continue;
      }

      // FindInCache is also expected to do an IMS check.
      pkgCache::PkgFileIterator File = (*PkgFile)->FindInCache(Cache);
      if (File.end() == true)
      {
	 if (Debug == true)
	    std::clog << "FindInCache returned end-Pointer" << std::endl;
	 return false;
      }

      Visited[File->ID] = true;
      if (Debug == true)
	 std::clog << "with ID " << File->ID << " is valid" << std::endl;
   }

   for (unsigned I = 0; I != Cache.HeaderP->PackageFileCount; I++)
      if (Visited[I] == false)
      {
	 if (Debug == true)
	    std::clog << "PkgFile with ID" << I << " wasn't visited" << std::endl;
	 return false;
      }

   if (_error->PendingError() == true)
   {
      if (Debug == true)
      {
	 std::clog << "Validity failed because of pending errors:" << std::endl;
	 _error->DumpErrors(std::clog, GlobalError::DEBUG, false);
      }
      return false;
   }

   if (OutMap != 0)
      *OutMap = Map.release();
   if (OutCache != 0)
      *OutCache = CacheP.release();
   return true;
}
									/*}}}*/
// ComputeSize - Compute the total size of a bunch of files		/*{{{*/
// ---------------------------------------------------------------------
/* Size is kind of an abstract notion that is only used for the progress
   meter */
static map_filesize_t ComputeSize(pkgSourceList const * const List, FileIterator Start,FileIterator End)
{
   map_filesize_t TotalSize = 0;
   if (List !=  NULL)
   {
      for (pkgSourceList::const_iterator i = List->begin(); i != List->end(); ++i)
      {
	 std::vector <pkgIndexFile *> *Indexes = (*i)->GetIndexFiles();
	 for (std::vector<pkgIndexFile *>::const_iterator j = Indexes->begin(); j != Indexes->end(); ++j)
	    if ((*j)->HasPackages() == true)
	       TotalSize += (*j)->Size();
      }
   }

   for (; Start < End; ++Start)
   {
      if ((*Start)->HasPackages() == false)
	 continue;
      TotalSize += (*Start)->Size();
   }
   return TotalSize;
}
									/*}}}*/
// BuildCache - Merge the list of index files into the cache		/*{{{*/
static bool BuildCache(pkgCacheGenerator &Gen,
		       OpProgress * const Progress,
		       map_filesize_t &CurrentSize,map_filesize_t TotalSize,
		       pkgSourceList const * const List,
		       FileIterator const Start, FileIterator const End)
{
   bool mergeFailure = false;

   auto const indexFileMerge = [&](pkgIndexFile * const I) {
      if (I->HasPackages() == false || mergeFailure)
	 return;

      if (I->Exists() == false)
	 return;

      if (I->FindInCache(Gen.GetCache()).end() == false)
      {
	 _error->Warning("Duplicate sources.list entry %s",
	       I->Describe().c_str());
	 return;
      }

      map_filesize_t const Size = I->Size();
      if (Progress != NULL)
	 Progress->OverallProgress(CurrentSize, TotalSize, Size, _("Reading package lists"));
      CurrentSize += Size;

      if (I->Merge(Gen,Progress) == false)
	 mergeFailure = true;
   };

   if (List !=  NULL)
   {
      for (pkgSourceList::const_iterator i = List->begin(); i != List->end(); ++i)
      {
	 if ((*i)->FindInCache(Gen.GetCache(), false).end() == false)
	 {
	    _error->Warning("Duplicate sources.list entry %s",
		  (*i)->Describe().c_str());
	    continue;
	 }

	 if ((*i)->Merge(Gen, Progress) == false)
	    return false;

	 std::vector <pkgIndexFile *> *Indexes = (*i)->GetIndexFiles();
	 if (Indexes != NULL)
	    std::for_each(Indexes->begin(), Indexes->end(), indexFileMerge);
	 if (mergeFailure)
	    return false;
      }
   }

   if (Start != End)
   {
      Gen.SelectReleaseFile("", "");
      std::for_each(Start, End, indexFileMerge);
      if (mergeFailure)
	 return false;
   }
   return true;
}
									/*}}}*/
// CacheGenerator::MakeStatusCache - Construct the status cache		/*{{{*/
// ---------------------------------------------------------------------
/* This makes sure that the status cache (the cache that has all
   index files from the sources list and all local ones) is ready
   to be mmaped. If OutMap is not zero then a MMap object representing
   the cache will be stored there. This is pretty much mandatory if you
   are using AllowMem. AllowMem lets the function be run as non-root
   where it builds the cache 'fast' into a memory buffer. */
static DynamicMMap* CreateDynamicMMap(FileFd * const CacheF, unsigned long Flags)
{
   map_filesize_t const MapStart = _config->FindI("APT::Cache-Start", APT_CACHE_START_DEFAULT);
   map_filesize_t const MapGrow = _config->FindI("APT::Cache-Grow", 1*1024*1024);
   map_filesize_t const MapLimit = _config->FindI("APT::Cache-Limit", 0);
   Flags |= MMap::Moveable;
   if (_config->FindB("APT::Cache-Fallback", false) == true)
      Flags |= MMap::Fallback;
   if (CacheF != NULL)
      return new DynamicMMap(*CacheF, Flags, MapStart, MapGrow, MapLimit);
   else
      return new DynamicMMap(Flags, MapStart, MapGrow, MapLimit);
}
static bool writeBackMMapToFile(pkgCacheGenerator * const Gen, DynamicMMap * const Map,
      std::string const &FileName)
{
   // Do not write the file back to /dev/null or try to change its mode...
   if (FileName == "/dev/null")
      return true;

   FileFd SCacheF(FileName, FileFd::WriteAtomic);
   if (SCacheF.IsOpen() == false || SCacheF.Failed())
      return false;

   fchmod(SCacheF.Fd(),0644);

   // Write out the main data
   if (SCacheF.Write(Map->Data(),Map->Size()) == false)
      return _error->Error(_("IO Error saving source cache"));

   // Write out the proper header
   Gen->GetCache().HeaderP->Dirty = false;
   Gen->GetCache().HeaderP->CacheFileSize = Gen->GetCache().CacheHash();
   if (SCacheF.Seek(0) == false ||
	 SCacheF.Write(Map->Data(),sizeof(*Gen->GetCache().HeaderP)) == false)
      return _error->Error(_("IO Error saving source cache"));
   Gen->GetCache().HeaderP->Dirty = true;
   return true;
}
static bool loadBackMMapFromFile(std::unique_ptr<pkgCacheGenerator> &Gen,
      std::unique_ptr<DynamicMMap> &Map, OpProgress * const Progress, FileFd &CacheF)
{
   Map.reset(CreateDynamicMMap(NULL, 0));
   if (unlikely(Map->validData()) == false)
      return false;
   if (CacheF.IsOpen() == false || CacheF.Seek(0) == false || CacheF.Failed())
      return false;
   _error->PushToStack();
   uint32_t const alloc = Map->RawAllocate(CacheF.Size());
   bool const newError = _error->PendingError();
   _error->MergeWithStack();
   if (alloc == 0 && newError)
      return false;
   if (CacheF.Read((unsigned char *)Map->Data() + alloc, CacheF.Size()) == false)
      return false;
   Gen.reset(new pkgCacheGenerator(Map.get(),Progress));
   return Gen->Start();
}
bool pkgCacheGenerator::MakeStatusCache(pkgSourceList &List,OpProgress *Progress,
			MMap **OutMap,bool)
{
   return pkgCacheGenerator::MakeStatusCache(List, Progress, OutMap, nullptr, true);
}
bool pkgCacheGenerator::MakeStatusCache(pkgSourceList &List,OpProgress *Progress,
			MMap **OutMap,pkgCache **OutCache, bool)
{
   // FIXME: deprecate the ignored AllowMem parameter
   bool const Debug = _config->FindB("Debug::pkgCacheGen", false);

   std::vector<pkgIndexFile *> Files;
   if (_system->AddStatusFiles(Files) == false)
      return false;

   // Decide if we can write to the files..
   string const CacheFileName = _config->FindFile("Dir::Cache::pkgcache");
   string const SrcCacheFileName = _config->FindFile("Dir::Cache::srcpkgcache");

   // ensure the cache directory exists
   if (CacheFileName.empty() == false || SrcCacheFileName.empty() == false)
   {
      string dir = _config->FindDir("Dir::Cache");
      size_t const len = dir.size();
      if (len > 5 && dir.find("/apt/", len - 6, 5) == len - 5)
	 dir = dir.substr(0, len - 5);
      if (CacheFileName.empty() == false)
	 CreateDirectory(dir, flNotFile(CacheFileName));
      if (SrcCacheFileName.empty() == false)
	 CreateDirectory(dir, flNotFile(SrcCacheFileName));
   }

   if (Progress != NULL)
      Progress->OverallProgress(0,1,1,_("Reading package lists"));

   bool pkgcache_fine = false;
   bool srcpkgcache_fine = false;
   bool volatile_fine = List.GetVolatileFiles().empty();
   FileFd CacheFile;
   if (CheckValidity(CacheFile, CacheFileName, List, Files.begin(), Files.end(), volatile_fine ? OutMap : NULL,
		     volatile_fine ? OutCache : NULL) == true)
   {
      if (Debug == true)
	 std::clog << "pkgcache.bin is valid - no need to build any cache" << std::endl;
      pkgcache_fine = true;
      srcpkgcache_fine = true;
   }

   FileFd SrcCacheFile;
   if (pkgcache_fine == false)
   {
      if (CheckValidity(SrcCacheFile, SrcCacheFileName, List, Files.end(), Files.end()) == true)
      {
	 if (Debug == true)
	    std::clog << "srcpkgcache.bin is valid - it can be reused" << std::endl;
	 srcpkgcache_fine = true;
      }
   }

   if (volatile_fine == true && srcpkgcache_fine == true && pkgcache_fine == true)
   {
      if (Progress != NULL)
	 Progress->OverallProgress(1,1,1,_("Reading package lists"));
      return true;
   }

   bool Writeable = false;
   if (srcpkgcache_fine == false || pkgcache_fine == false)
   {
      if (CacheFileName.empty() == false)
	 Writeable = access(flNotFile(CacheFileName).c_str(),W_OK) == 0;
      else if (SrcCacheFileName.empty() == false)
	 Writeable = access(flNotFile(SrcCacheFileName).c_str(),W_OK) == 0;

      if (Debug == true)
	 std::clog << "Do we have write-access to the cache files? " << (Writeable ? "YES" : "NO") << std::endl;
   }

   // At this point we know we need to construct something, so get storage ready
   std::unique_ptr<DynamicMMap> Map(CreateDynamicMMap(NULL, 0));
   if (unlikely(Map->validData()) == false)
      return false;
   if (Debug == true)
      std::clog << "Open memory Map (not filebased)" << std::endl;

   std::unique_ptr<pkgCacheGenerator> Gen{nullptr};
   map_filesize_t CurrentSize = 0;
   std::vector<pkgIndexFile*> VolatileFiles = List.GetVolatileFiles();
   map_filesize_t TotalSize = ComputeSize(NULL, VolatileFiles.begin(), VolatileFiles.end());
   if (srcpkgcache_fine == true && pkgcache_fine == false)
   {
      if (Debug == true)
	 std::clog << "srcpkgcache.bin was valid - populate MMap with it" << std::endl;
      if (loadBackMMapFromFile(Gen, Map, Progress, SrcCacheFile) == false)
	 return false;
      srcpkgcache_fine = true;
      TotalSize += ComputeSize(NULL, Files.begin(), Files.end());
   }
   else if (srcpkgcache_fine == false)
   {
      if (Debug == true)
	 std::clog << "srcpkgcache.bin is NOT valid - rebuild" << std::endl;
      Gen.reset(new pkgCacheGenerator(Map.get(),Progress));
      if (Gen->Start() == false)
	 return false;

      TotalSize += ComputeSize(&List, Files.begin(),Files.end());
      if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, &List,
	       Files.end(),Files.end()) == false)
	 return false;

      if (Writeable == true && SrcCacheFileName.empty() == false)
	 if (writeBackMMapToFile(Gen.get(), Map.get(), SrcCacheFileName) == false)
	    return false;
   }

   if (pkgcache_fine == false)
   {
      if (Debug == true)
	 std::clog << "Building status cache in pkgcache.bin now" << std::endl;
      if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, NULL,
	       Files.begin(), Files.end()) == false)
	 return false;

      if (Writeable == true && CacheFileName.empty() == false)
	 if (writeBackMMapToFile(Gen.get(), Map.get(), CacheFileName) == false)
	    return false;
   }

   if (Debug == true)
      std::clog << "Caches done. " << (volatile_fine ? "No volatile files, so we are done here." : "Now bring in the volatile files") << std::endl;

   if (volatile_fine == false)
   {
      if (Gen == nullptr)
      {
	 if (Debug == true)
	    std::clog << "Populate new MMap with cachefile contents" << std::endl;
	 if (loadBackMMapFromFile(Gen, Map, Progress, CacheFile) == false)
	    return false;
      }

      Files = List.GetVolatileFiles();
      if (BuildCache(*Gen, Progress, CurrentSize, TotalSize, NULL,
	       Files.begin(), Files.end()) == false)
	 return false;
   }

   if (OutMap != nullptr)
      *OutMap = Map.release();

   if (Debug == true)
      std::clog << "Everything is ready for shipping" << std::endl;
   return true;
}
									/*}}}*/
// CacheGenerator::MakeOnlyStatusCache - Build only a status files cache/*{{{*/
class APT_HIDDEN ScopedErrorMerge {
public:
   ScopedErrorMerge() { _error->PushToStack(); }
   ~ScopedErrorMerge() { _error->MergeWithStack(); }
};
bool pkgCacheGenerator::MakeOnlyStatusCache(OpProgress *Progress,DynamicMMap **OutMap)
{
   std::vector<pkgIndexFile *> Files;
   if (_system->AddStatusFiles(Files) == false)
      return false;

   ScopedErrorMerge sem;
   std::unique_ptr<DynamicMMap> Map(CreateDynamicMMap(NULL, 0));
   if (unlikely(Map->validData()) == false)
      return false;
   map_filesize_t CurrentSize = 0;
   map_filesize_t TotalSize = 0;
   TotalSize = ComputeSize(NULL, Files.begin(), Files.end());

   // Build the status cache
   if (Progress != NULL)
      Progress->OverallProgress(0,1,1,_("Reading package lists"));
   pkgCacheGenerator Gen(Map.get(),Progress);
   if (Gen.Start() == false || _error->PendingError() == true)
      return false;
   if (BuildCache(Gen,Progress,CurrentSize,TotalSize, NULL,
		  Files.begin(), Files.end()) == false)
      return false;

   if (_error->PendingError() == true)
      return false;
   *OutMap = Map.release();

   return true;
}
									/*}}}*/

pkgCacheListParser::pkgCacheListParser() : Owner(NULL), OldDepLast(NULL), d(NULL) {}
pkgCacheListParser::~pkgCacheListParser() {}