Adding upstream version 2.7.12.upstream/2.7.12

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1886 insertions, 0 deletions

diff --git a/apt-pkg/pkgcachegen.cc b/apt-pkg/pkgcachegen.cc
new file mode 100644
index 0000000..5047561
--- /dev/null
+++ b/apt-pkg/pkgcachegen.cc
@@ -0,0 +1,1886 @@
+// -*- 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/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;
+
+static bool IsDuplicateDescription(pkgCache &Cache, pkgCache::DescIterator Desc,
+			    APT::StringView CurMd5, std::string const &CurLang);
+
+using std::string;
+using APT::StringView;
+
+// 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)
+{
+}
+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();
+      if (archs.size() > 1)
+      {
+	 std::vector<std::string>::const_iterator a = archs.begin();
+	 std::string list = *a;
+	 for (++a; a != archs.end(); ++a)
+	    list.append(",").append(*a);
+	 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 (APT::StringView* ViewP : Dynamic<APT::StringView>::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 = StringView(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;
+
+      Counter++;
+      if (Counter % 100 == 0 && Progress != 0)
+	 Progress->Progress(List.Offset());
+
+      APT::StringView Arch = List.Architecture();
+      Dynamic<APT::StringView> DynArch(Arch);
+      APT::StringView Version = List.Version();
+      Dynamic<APT::StringView> 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
+   StringView 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 (std::vector<std::string>::const_iterator CurLang = availDesc.begin(); CurLang != availDesc.end(); ++CurLang)
+      {
+	 // don't add a new description if we have one for the given
+	 // md5 && language
+	 if (IsDuplicateDescription(Cache, VerDesc, CurMd5, *CurLang) == true)
+	    continue;
+
+	 AddNewDescription(List, Ver, *CurLang, CurMd5, md5idx);
+      }
+
+      // 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,
+					 APT::StringView const &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();
+   APT::StringView ListSHA256;
+
+   bool const Debug = _config->FindB("Debug::pkgCacheGen", false);
+   auto DebList = dynamic_cast<debListParser *>(&List);
+   if (DebList != nullptr)
+      ListSHA256 = DebList->SHA256();
+   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() || VersionExtra[Ver->ID].SHA256[0] == 0)
+                  break;
+               // We have SHA256 for both, so they must match.
+               if (ListSHA256 == APT::StringView(VersionExtra[Ver->ID].SHA256, 64))
+                  break;
+	       if (Debug)
+		  std::cerr << "Found differing SHA256 for " << Pkg.Name() << "=" << Version.to_string() << 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;
+	    }
+	 }
+	 // 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 */
+   StringView 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();
+	P.end() == false; P = Grp.NextPkg(P))
+   {
+      for (pkgCache::VerIterator V = P.VersionList();
+	   V.end() == false; ++V)
+      {
+	 if (V->DescriptionList == 0 || Cache.ViewString(V.DescriptionList()->md5sum) != CurMd5)
+	    continue;
+	 Ver->DescriptionList = V->DescriptionList;
+      }
+   }
+
+   // We haven't found reusable descriptions, so add the first description(s)
+   map_stringitem_t md5idx = Ver->DescriptionList == 0 ? 0 : Ver.DescriptionList()->md5sum;
+   std::vector<std::string> availDesc = List.AvailableDescriptionLanguages();
+   for (std::vector<std::string>::const_iterator CurLang = availDesc.begin(); CurLang != availDesc.end(); ++CurLang)
+      if (AddNewDescription(List, Ver, *CurLang, CurMd5, md5idx) == false)
+	 return false;
+   return true;
+}
+									/*}}}*/
+bool pkgCacheGenerator::AddNewDescription(ListParser &List, pkgCache::VerIterator &Ver, std::string const &lang, APT::StringView CurMd5, map_stringitem_t &md5idx) /*{{{*/
+{
+   pkgCache::DescIterator Desc;
+   Dynamic<pkgCache::DescIterator> DynDesc(Desc);
+
+   map_pointer<pkgCache::Description> const descindex = NewDescription(Desc, lang, 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
+   pkgCache::DescIterator VerDesc = Ver.DescriptionList(); // old value might be invalid after ReMap
+   for (;VerDesc.end() == false && VerDesc->NextDesc != 0; ++VerDesc);
+   map_pointer<pkgCache::Description> * const LastNextDesc = (VerDesc.end() == true) ? &Ver->DescriptionList : &VerDesc->NextDesc;
+   *LastNextDesc = descindex;
+
+   if (NewFileDesc(Desc,List) == false)
+      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, StringView Name)
+{
+   Dynamic<StringView> 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, StringView Name,
+					StringView Arch) {
+   pkgCache::GrpIterator Grp;
+   Dynamic<StringView> DName(Name);
+   Dynamic<StringView> 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(':');
+      StringView ArchA = Name.substr(found + 1);
+      if (ArchA != "any")
+      {
+	 // ArchA is used inside the loop which might remap (NameA is not used)
+	 Dynamic<StringView> DynArchA(ArchA);
+	 StringView NameA = Name.substr(0, found);
+	 pkgCache::PkgIterator PkgA = Cache.FindPkg(NameA, ArchA);
+	 Dynamic<pkgCache::PkgIterator> DynPkgA(PkgA);
+	 if (PkgA.end())
+	 {
+	    Dynamic<StringView> 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!",
+		  NameA.to_string().c_str(), ArchA.to_string().c_str());
+	 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, V->VerStr, 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)
+{
+   APT::StringView Arch = P.Arch() == NULL ? "" : P.Arch();
+   Dynamic<APT::StringView> 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();
+   VF->Size = List.Size();
+   if (Cache.HeaderP->MaxVerFileSize < VF->Size)
+      Cache.HeaderP->MaxVerFileSize = VF->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,
+					    APT::StringView const &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();
+
+   //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;
+   
+   // Get a structure
+   auto const DescFile = AllocateInMap<pkgCache::DescFile>();
+   if (DescFile == 0)
+      return false;
+
+   pkgCache::DescFileIterator DF(Cache,Cache.DescFileP + DescFile);
+   DF->File = map_pointer<pkgCache::PackageFile>{NarrowOffset(CurrentFile - Cache.PkgFileP)};
+
+   // Link it to the end of the list
+   map_pointer<pkgCache::DescFile> *Last = &Desc->FileList;
+   for (pkgCache::DescFileIterator D = Desc.FileList(); D.end() == false; ++D)
+      Last = &D->NextFile;
+
+   DF->NextFile = *Last;
+   *Last = DF.MapPointer();
+   
+   DF->Offset = List.Offset();
+   DF->Size = List.Size();
+   if (Cache.HeaderP->MaxDescFileSize < DF->Size)
+      Cache.HeaderP->MaxDescFileSize = DF->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,
+					    APT::StringView 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,
+					       StringView PackageName,
+					       StringView Arch,
+					       StringView Version,
+					       uint8_t const Op,
+					       uint8_t const Type)
+{
+   pkgCache::GrpIterator Grp;
+   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
+   Dynamic<StringView> DynPackageName(PackageName);
+   Dynamic<StringView> DynArch(Arch);
+   Dynamic<StringView> 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,
+						StringView PkgName,
+						StringView PkgArch,
+						StringView Version,
+						uint8_t const Flags)
+{
+   pkgCache const &Cache = Owner->Cache;
+   Dynamic<StringView> DynPkgName(PkgName);
+   Dynamic<StringView> DynArch(PkgArch);
+   Dynamic<StringView> DynVersion(Version);
+
+   // We do not add self referencing provides
+   if (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, StringView Package,
+				StringView Version, uint8_t const Flags) {
+   pkgCache &Cache = Owner->Cache;
+   pkgCache::GrpIterator Grp = Cache.FindGrp(Package);
+   Dynamic<pkgCache::GrpIterator> DynGrp(Grp);
+   Dynamic<StringView> DynPackage(Package);
+   Dynamic<StringView> 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,
+				   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++;
+
+   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)
+{
+   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;
+}
+									/*}}}*/
+// IsDuplicateDescription						/*{{{*/
+static bool IsDuplicateDescription(pkgCache &Cache, pkgCache::DescIterator Desc,
+			    APT::StringView CurMd5, std::string const &CurLang)
+{
+   // Descriptions in the same link-list have all the same md5
+   if (Desc.end() == true || Cache.ViewString(Desc->md5sum) != CurMd5)
+      return false;
+   for (; Desc.end() == false; ++Desc)
+      if (Desc.LanguageCode() == CurLang)
+	 return true;
+   return false;
+}
+									/*}}}*/
+
+pkgCacheListParser::pkgCacheListParser() : Owner(NULL), OldDepLast(NULL), d(NULL) {}
+pkgCacheListParser::~pkgCacheListParser() {}