Adding upstream version 2.6.1.upstream/2.6.1upstream

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

1 files changed, 2564 insertions, 0 deletions

diff --git a/apt-pkg/depcache.cc b/apt-pkg/depcache.cc
new file mode 100644
index 0000000..322bf1b
--- /dev/null
+++ b/apt-pkg/depcache.cc
@@ -0,0 +1,2564 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Dependency Cache - Caches Dependency information.
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <config.h>
+
+#include <apt-pkg/algorithms.h>
+#include <apt-pkg/aptconfiguration.h>
+#include <apt-pkg/cachefile.h>
+#include <apt-pkg/cachefilter.h>
+#include <apt-pkg/cacheset.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/depcache.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/macros.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/prettyprinters.h>
+#include <apt-pkg/progress.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/tagfile-keys.h>
+#include <apt-pkg/tagfile.h>
+#include <apt-pkg/version.h>
+#include <apt-pkg/versionmatch.h>
+
+#include <algorithm>
+#include <iostream>
+#include <memory>
+#include <sstream>
+#include <iterator>
+#include <list>
+#include <set>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+#include <stdio.h>
+#include <string.h>
+
+#include <sys/stat.h>
+
+#include <apti18n.h>
+									/*}}}*/
+
+using std::string;
+
+// helper for kernel autoremoval				  	/*{{{*/
+
+/** \brief Returns \b true for packages matching a regular
+ *  expression in APT::NeverAutoRemove.
+ */
+class DefaultRootSetFunc2 : public pkgDepCache::DefaultRootSetFunc
+{
+   std::unique_ptr<APT::CacheFilter::Matcher> Kernels;
+
+   public:
+   DefaultRootSetFunc2(pkgCache *cache) : Kernels(APT::KernelAutoRemoveHelper::GetProtectedKernelsFilter(cache)){};
+   virtual ~DefaultRootSetFunc2(){};
+
+   bool InRootSet(const pkgCache::PkgIterator &pkg) APT_OVERRIDE { return pkg.end() == false && ((*Kernels)(pkg) || DefaultRootSetFunc::InRootSet(pkg)); };
+};
+
+									/*}}}*/
+// helper for Install-Recommends-Sections and Never-MarkAuto-Sections	/*{{{*/
+// FIXME: Has verbatim copy in cmdline/apt-mark.cc
+static bool ConfigValueInSubTree(const char* SubTree, std::string_view const needle)
+{
+   if (needle.empty())
+      return false;
+   Configuration::Item const *Opts = _config->Tree(SubTree);
+   if (Opts != nullptr && Opts->Child != nullptr)
+   {
+      Opts = Opts->Child;
+      for (; Opts != nullptr; Opts = Opts->Next)
+      {
+	 if (Opts->Value.empty())
+	    continue;
+	 if (needle == Opts->Value)
+	    return true;
+      }
+   }
+   return false;
+}
+static bool SectionInSubTree(char const * const SubTree, std::string_view Needle)
+{
+   if (ConfigValueInSubTree(SubTree, Needle))
+      return true;
+   auto const sub = Needle.rfind('/');
+   if (sub == std::string_view::npos)
+   {
+      std::string special{"/"};
+      special.append(Needle);
+      return ConfigValueInSubTree(SubTree, special);
+   }
+   return ConfigValueInSubTree(SubTree, Needle.substr(sub + 1));
+}
+									/*}}}*/
+pkgDepCache::ActionGroup::ActionGroup(pkgDepCache &cache) :		/*{{{*/
+  d(NULL), cache(cache), released(false)
+{
+  cache.IncreaseActionGroupLevel();
+}
+
+void pkgDepCache::ActionGroup::release()
+{
+  if(released)
+     return;
+  released = true;
+  if (cache.DecreaseActionGroupLevel() == 0)
+     cache.MarkAndSweep();
+}
+
+pkgDepCache::ActionGroup::~ActionGroup()
+{
+  release();
+}
+int pkgDepCache::IncreaseActionGroupLevel()
+{
+   return ++group_level;
+}
+int pkgDepCache::DecreaseActionGroupLevel()
+{
+   if(group_level == 0)
+   {
+      std::cerr << "W: Unbalanced action groups, expect badness\n";
+      return -1;
+   }
+   return --group_level;
+}
+									/*}}}*/
+// DepCache::pkgDepCache - Constructors					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+
+struct pkgDepCache::Private
+{
+   std::unique_ptr<InRootSetFunc> inRootSetFunc;
+   std::unique_ptr<APT::CacheFilter::Matcher> IsAVersionedKernelPackage, IsProtectedKernelPackage;
+};
+pkgDepCache::pkgDepCache(pkgCache *const pCache, Policy *const Plcy) : group_level(0), Cache(pCache), PkgState(0), DepState(0),
+								       iUsrSize(0), iDownloadSize(0), iInstCount(0), iDelCount(0), iKeepCount(0),
+								       iBrokenCount(0), iPolicyBrokenCount(0), iBadCount(0), d(new Private)
+{
+   DebugMarker = _config->FindB("Debug::pkgDepCache::Marker", false);
+   DebugAutoInstall = _config->FindB("Debug::pkgDepCache::AutoInstall", false);
+   delLocalPolicy = 0;
+   LocalPolicy = Plcy;
+   if (LocalPolicy == 0)
+      delLocalPolicy = LocalPolicy = new Policy;
+}
+									/*}}}*/
+// DepCache::~pkgDepCache - Destructor					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgDepCache::~pkgDepCache()
+{
+   delete [] PkgState;
+   delete [] DepState;
+   delete delLocalPolicy;
+   delete d;
+}
+									/*}}}*/
+bool pkgDepCache::CheckConsistency(char const *const msgtag)		/*{{{*/
+{
+   auto const OrigPkgState = PkgState;
+   auto const OrigDepState = DepState;
+
+   PkgState = new StateCache[Head().PackageCount];
+   DepState = new unsigned char[Head().DependsCount];
+   memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
+   memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
+
+   auto const origUsrSize = iUsrSize;
+   auto const origDownloadSize = iDownloadSize;
+   auto const origInstCount = iInstCount;
+   auto const origDelCount = iDelCount;
+   auto const origKeepCount = iKeepCount;
+   auto const origBrokenCount = iBrokenCount;
+   auto const origPolicyBrokenCount = iPolicyBrokenCount;
+   auto const origBadCount = iBadCount;
+
+   for (PkgIterator I = PkgBegin(); not I.end(); ++I)
+   {
+      auto &State = PkgState[I->ID];
+      auto const &OrigState = OrigPkgState[I->ID];
+      State.iFlags = OrigState.iFlags;
+
+      State.CandidateVer = OrigState.CandidateVer;
+      State.InstallVer = OrigState.InstallVer;
+      State.Mode = OrigState.Mode;
+      State.Update(I,*this);
+      State.Status = OrigState.Status;
+   }
+   PerformDependencyPass(nullptr);
+
+   _error->PushToStack();
+#define APT_CONSISTENCY_CHECK(VAR,STR) \
+   if (orig##VAR != i##VAR) \
+      _error->Warning("Internal Inconsistency in pkgDepCache: " #VAR " " STR " vs " STR " (%s)", i##VAR, orig##VAR, msgtag)
+   APT_CONSISTENCY_CHECK(UsrSize, "%lld");
+   APT_CONSISTENCY_CHECK(DownloadSize, "%lld");
+   APT_CONSISTENCY_CHECK(InstCount, "%lu");
+   APT_CONSISTENCY_CHECK(DelCount, "%lu");
+   APT_CONSISTENCY_CHECK(KeepCount, "%lu");
+   APT_CONSISTENCY_CHECK(BrokenCount, "%lu");
+   APT_CONSISTENCY_CHECK(PolicyBrokenCount, "%lu");
+   APT_CONSISTENCY_CHECK(BadCount, "%lu");
+#undef APT_CONSISTENCY_CHECK
+
+   for (PkgIterator P = PkgBegin(); not P.end(); ++P)
+   {
+      auto const &State = PkgState[P->ID];
+      auto const &OrigState = OrigPkgState[P->ID];
+      if (State.Status != OrigState.Status)
+	 _error->Warning("Internal Inconsistency in pkgDepCache: Status of %s is %d vs %d (%s)", P.FullName().c_str(), State.Status, OrigState.Status, msgtag);
+      if (State.NowBroken() != OrigState.NowBroken())
+	 _error->Warning("Internal Inconsistency in pkgDepCache: Now broken for %s is %d vs %d (%s)", P.FullName().c_str(), static_cast<int>(State.DepState), static_cast<int>(OrigState.DepState), msgtag);
+      if (State.NowPolicyBroken() != OrigState.NowPolicyBroken())
+	 _error->Warning("Internal Inconsistency in pkgDepCache: Now policy broken for %s is %d vs %d (%s)", P.FullName().c_str(), static_cast<int>(State.DepState), static_cast<int>(OrigState.DepState), msgtag);
+      if (State.InstBroken() != OrigState.InstBroken())
+	 _error->Warning("Internal Inconsistency in pkgDepCache: Install broken for %s is %d vs %d (%s)", P.FullName().c_str(), static_cast<int>(State.DepState), static_cast<int>(OrigState.DepState), msgtag);
+      if (State.InstPolicyBroken() != OrigState.InstPolicyBroken())
+	 _error->Warning("Internal Inconsistency in pkgDepCache: Install broken for %s is %d vs %d (%s)", P.FullName().c_str(), static_cast<int>(State.DepState), static_cast<int>(OrigState.DepState), msgtag);
+   }
+
+   auto inconsistent = _error->PendingError();
+   _error->MergeWithStack();
+
+   delete[] PkgState;
+   delete[] DepState;
+   PkgState = OrigPkgState;
+   DepState = OrigDepState;
+   iUsrSize = origUsrSize;
+   iDownloadSize = origDownloadSize;
+   iInstCount = origInstCount;
+   iDelCount = origDelCount;
+   iKeepCount = origKeepCount;
+   iBrokenCount = origBrokenCount;
+   iPolicyBrokenCount = origPolicyBrokenCount;
+   iBadCount = origBadCount;
+
+   return not inconsistent;
+}
+									/*}}}*/
+// DepCache::Init - Generate the initial extra structures.		/*{{{*/
+// ---------------------------------------------------------------------
+/* This allocats the extension buffers and initializes them. */
+bool pkgDepCache::Init(OpProgress * const Prog)
+{
+   // Suppress mark updates during this operation (just in case) and
+   // run a mark operation when Init terminates.
+   ActionGroup actions(*this);
+
+   delete [] PkgState;
+   delete [] DepState;
+   PkgState = new StateCache[Head().PackageCount];
+   DepState = new unsigned char[Head().DependsCount];
+   memset(PkgState,0,sizeof(*PkgState)*Head().PackageCount);
+   memset(DepState,0,sizeof(*DepState)*Head().DependsCount);
+
+   if (Prog != 0)
+   {
+      Prog->OverallProgress(0,2*Head().PackageCount,Head().PackageCount,
+			    _("Building dependency tree"));
+      Prog->SubProgress(Head().PackageCount,_("Candidate versions"));
+   }
+
+   /* Set the current state of everything. In this state all of the
+      packages are kept exactly as is. See AllUpgrade */
+   int Done = 0;
+   for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
+   {
+      if (Prog != 0 && Done%20 == 0)
+	 Prog->Progress(Done);
+
+      // Find the proper cache slot
+      StateCache &State = PkgState[I->ID];
+      State.iFlags = 0;
+
+      // Figure out the install version
+      State.CandidateVer = LocalPolicy->GetCandidateVer(I);
+      State.InstallVer = I.CurrentVer();
+      State.Mode = ModeKeep;
+
+      State.Update(I,*this);
+   }
+
+   if (Prog != 0)
+   {
+      Prog->OverallProgress(Head().PackageCount,2*Head().PackageCount,
+			    Head().PackageCount,
+			    _("Building dependency tree"));
+      Prog->SubProgress(Head().PackageCount,_("Dependency generation"));
+   }
+
+   Update(Prog);
+
+   if(Prog != 0)
+      Prog->Done();
+
+   return true;
+}
+									/*}}}*/
+bool pkgDepCache::readStateFile(OpProgress * const Prog)		/*{{{*/
+{
+   FileFd state_file;
+   string const state = _config->FindFile("Dir::State::extended_states");
+   if(RealFileExists(state)) {
+      state_file.Open(state, FileFd::ReadOnly, FileFd::Extension);
+      off_t const file_size = state_file.Size();
+      if(Prog != NULL)
+      {
+	 Prog->Done();
+	 Prog->OverallProgress(0, file_size, 1,
+			       _("Reading state information"));
+      }
+
+      pkgTagFile tagfile(&state_file);
+      pkgTagSection section;
+      off_t amt = 0;
+      bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
+      while(tagfile.Step(section)) {
+	 auto const pkgname = section.Find(pkgTagSection::Key::Package);
+	 auto pkgarch = section.Find(pkgTagSection::Key::Architecture);
+	 if (pkgarch.empty() == true)
+	    pkgarch = "any";
+	 pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
+	 // Silently ignore unknown packages and packages with no actual version.
+	 if(pkg.end() == true || pkg->VersionList == 0)
+	    continue;
+
+	 short const reason = section.FindI("Auto-Installed", 0);
+	 if(reason > 0)
+	 {
+	    PkgState[pkg->ID].Flags |= Flag::Auto;
+	    if (unlikely(debug_autoremove))
+	       std::clog << "Auto-Installed : " << pkg.FullName() << std::endl;
+	    if (pkgarch == "any")
+	    {
+	       pkgCache::GrpIterator G = pkg.Group();
+	       for (pkg = G.NextPkg(pkg); pkg.end() != true; pkg = G.NextPkg(pkg))
+		  if (pkg->VersionList != 0)
+		     PkgState[pkg->ID].Flags |= Flag::Auto;
+	    }
+	 }
+	 amt += section.size();
+	 if(Prog != NULL)
+	    Prog->OverallProgress(amt, file_size, 1, 
+				  _("Reading state information"));
+      }
+      if(Prog != NULL)
+	 Prog->OverallProgress(file_size, file_size, 1,
+			       _("Reading state information"));
+   }
+
+   return true;
+}
+									/*}}}*/
+bool pkgDepCache::writeStateFile(OpProgress * const /*prog*/, bool const InstalledOnly)	/*{{{*/
+{
+   bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
+   
+   if(debug_autoremove)
+      std::clog << "pkgDepCache::writeStateFile()" << std::endl;
+
+   FileFd StateFile;
+   string const state = _config->FindFile("Dir::State::extended_states");
+   if (CreateAPTDirectoryIfNeeded(_config->FindDir("Dir::State"), flNotFile(state)) == false)
+      return false;
+
+   // if it does not exist, create a empty one
+   if(!RealFileExists(state))
+   {
+      StateFile.Open(state, FileFd::WriteAtomic, FileFd::Extension);
+      StateFile.Close();
+   }
+
+   // open it
+   if (!StateFile.Open(state, FileFd::ReadOnly, FileFd::Extension))
+      return _error->Error(_("Failed to open StateFile %s"),
+			   state.c_str());
+
+   FileFd OutFile(state, FileFd::ReadWrite | FileFd::Atomic, FileFd::Extension);
+   if (OutFile.IsOpen() == false || OutFile.Failed() == true)
+      return _error->Error(_("Failed to write temporary StateFile %s"), state.c_str());
+
+   // first merge with the existing sections
+   pkgTagFile tagfile(&StateFile);
+   pkgTagSection section;
+   std::set<string> pkgs_seen;
+   while(tagfile.Step(section)) {
+	 auto const pkgname = section.Find(pkgTagSection::Key::Package);
+	 auto pkgarch = section.Find(pkgTagSection::Key::Architecture);
+	 if (pkgarch.empty() == true)
+	    pkgarch = "native";
+	 // Silently ignore unknown packages and packages with no actual
+	 // version.
+	 pkgCache::PkgIterator pkg = Cache->FindPkg(pkgname, pkgarch);
+	 if(pkg.end() || pkg.VersionList().end())
+	    continue;
+	 StateCache const &P = PkgState[pkg->ID];
+	 bool newAuto = (P.Flags & Flag::Auto);
+	 // reset to default (=manual) not installed or now-removed ones if requested
+	 if (InstalledOnly && (
+	     (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
+	     (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
+	    newAuto = false;
+	 if (newAuto == false)
+	 {
+	    // The section is obsolete if it contains no other tag
+	    auto const count = section.Count();
+	    if (count < 2 ||
+		(count == 2 && section.Exists("Auto-Installed")) ||
+		(count == 3 && section.Exists("Auto-Installed") && section.Exists("Architecture")))
+	    {
+	       if(debug_autoremove)
+		  std::clog << "Drop obsolete section with " << count << " fields for " << APT::PrettyPkg(this, pkg) << std::endl;
+	       continue;
+	    }
+	 }
+
+	 if(debug_autoremove)
+	    std::clog << "Update existing AutoInstall to " << newAuto << " for " << APT::PrettyPkg(this, pkg) << std::endl;
+
+	 std::vector<pkgTagSection::Tag> rewrite;
+	 rewrite.push_back(pkgTagSection::Tag::Rewrite("Architecture", pkg.Arch()));
+	 rewrite.push_back(pkgTagSection::Tag::Rewrite("Auto-Installed", newAuto ? "1" : "0"));
+	 section.Write(OutFile, NULL, rewrite);
+	 if (OutFile.Write("\n", 1) == false)
+	    return false;
+	 pkgs_seen.insert(pkg.FullName());
+   }
+
+   // then write the ones we have not seen yet
+   for(pkgCache::PkgIterator pkg=Cache->PkgBegin(); !pkg.end(); ++pkg) {
+      StateCache const &P = PkgState[pkg->ID];
+      if(P.Flags & Flag::Auto) {
+	 if (pkgs_seen.find(pkg.FullName()) != pkgs_seen.end()) {
+	    if(debug_autoremove)
+	       std::clog << "Skipping already written " << APT::PrettyPkg(this, pkg) << std::endl;
+	    continue;
+	 }
+	 // skip not installed ones if requested
+	 if (InstalledOnly && (
+	     (pkg->CurrentVer == 0 && P.Mode != ModeInstall) ||
+	     (pkg->CurrentVer != 0 && P.Mode == ModeDelete)))
+	    continue;
+	 if(debug_autoremove)
+	    std::clog << "Writing new AutoInstall: " << APT::PrettyPkg(this, pkg) << std::endl;
+	 std::string stanza = "Package: ";
+	 stanza.append(pkg.Name())
+	      .append("\nArchitecture: ").append(pkg.Arch())
+	      .append("\nAuto-Installed: 1\n\n");
+	 if (OutFile.Write(stanza.c_str(), stanza.length()) == false)
+	    return false;
+      }
+   }
+   if (StateFile.Failed())
+   {
+      OutFile.OpFail();
+      return false;
+   }
+   if (OutFile.Close() == false)
+      return false;
+   chmod(state.c_str(), 0644);
+   return true;
+}
+									/*}}}*/
+// DepCache::CheckDep - Checks a single dependency			/*{{{*/
+// ---------------------------------------------------------------------
+/* This first checks the dependency against the main target package and
+   then walks along the package provides list and checks if each provides 
+   will be installed then checks the provides against the dep. Res will be 
+   set to the package which was used to satisfy the dep. */
+bool pkgDepCache::CheckDep(DepIterator const &Dep,int const Type,PkgIterator &Res)
+{
+   Res = Dep.TargetPkg();
+
+   /* Check simple depends. A depends -should- never self match but 
+      we allow it anyhow because dpkg does. Technically it is a packaging
+      bug. Conflicts may never self match */
+   if (Dep.IsIgnorable(Res) == false)
+   {
+      // Check the base package
+      if (Type == NowVersion)
+      {
+	 if (Res->CurrentVer != 0 && Dep.IsSatisfied(Res.CurrentVer()) == true)
+	    return true;
+      }
+      else if (Type == InstallVersion)
+      {
+	 if (PkgState[Res->ID].InstallVer != 0 &&
+	       Dep.IsSatisfied(PkgState[Res->ID].InstVerIter(*this)) == true)
+	    return true;
+      }
+      else if (Type == CandidateVersion)
+	 if (PkgState[Res->ID].CandidateVer != 0 &&
+	       Dep.IsSatisfied(PkgState[Res->ID].CandidateVerIter(*this)) == true)
+	    return true;
+   }
+
+   if (Dep->Type == Dep::Obsoletes)
+      return false;
+
+   // Check the providing packages
+   PrvIterator P = Dep.TargetPkg().ProvidesList();
+   for (; P.end() != true; ++P)
+   {
+      if (Dep.IsIgnorable(P) == true)
+	 continue;
+
+      // Check if the provides is a hit
+      if (Type == NowVersion)
+      {
+	 if (P.OwnerPkg().CurrentVer() != P.OwnerVer())
+	    continue;
+      }
+      else if (Type == InstallVersion)
+      {
+	 StateCache &State = PkgState[P.OwnerPkg()->ID];
+	 if (State.InstallVer != (Version *)P.OwnerVer())
+	    continue;
+      }
+      else if (Type == CandidateVersion)
+      {
+	 StateCache &State = PkgState[P.OwnerPkg()->ID];
+	 if (State.CandidateVer != (Version *)P.OwnerVer())
+	    continue;
+      }
+
+      // Compare the versions.
+      if (Dep.IsSatisfied(P) == true)
+      {
+	 Res = P.OwnerPkg();
+	 return true;
+      }
+   }
+
+   return false;
+}
+									/*}}}*/
+// DepCache::AddSizes - Add the packages sizes to the counters		/*{{{*/
+// ---------------------------------------------------------------------
+/* Call with Inverse = true to perform the inverse operation */
+void pkgDepCache::AddSizes(const PkgIterator &Pkg, bool const Inverse)
+{
+   StateCache &P = PkgState[Pkg->ID];
+   
+   if (Pkg->VersionList == 0)
+      return;
+   
+   if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure && 
+       P.Keep() == true)
+      return;
+   
+   // Compute the size data
+   if (P.NewInstall() == true)
+   {
+      if (Inverse == false) {
+	 iUsrSize += P.InstVerIter(*this)->InstalledSize;
+	 iDownloadSize += P.InstVerIter(*this)->Size;
+      } else {
+	 iUsrSize -= P.InstVerIter(*this)->InstalledSize;
+	 iDownloadSize -= P.InstVerIter(*this)->Size;
+      }
+      return;
+   }
+   
+   // Upgrading
+   if (Pkg->CurrentVer != 0 && 
+       (P.InstallVer != (Version *)Pkg.CurrentVer() || 
+	(P.iFlags & ReInstall) == ReInstall) && P.InstallVer != 0)
+   {
+      if (Inverse == false) {
+	 iUsrSize -= Pkg.CurrentVer()->InstalledSize;
+	 iUsrSize += P.InstVerIter(*this)->InstalledSize;
+	 iDownloadSize += P.InstVerIter(*this)->Size;
+      } else {
+	 iUsrSize -= P.InstVerIter(*this)->InstalledSize;
+	 iUsrSize += Pkg.CurrentVer()->InstalledSize;
+	 iDownloadSize -= P.InstVerIter(*this)->Size;
+      }
+      return;
+   }
+   
+   // Reinstall
+   if (Pkg.State() == pkgCache::PkgIterator::NeedsUnpack &&
+       P.Delete() == false)
+   {
+      if (Inverse == false)
+	 iDownloadSize += P.InstVerIter(*this)->Size;
+      else
+	 iDownloadSize -= P.InstVerIter(*this)->Size;
+      return;
+   }
+   
+   // Removing
+   if (Pkg->CurrentVer != 0 && P.InstallVer == 0)
+   {
+      if (Inverse == false)
+	 iUsrSize -= Pkg.CurrentVer()->InstalledSize;
+      else
+	 iUsrSize += Pkg.CurrentVer()->InstalledSize;
+      return;
+   }   
+}
+									/*}}}*/
+// DepCache::AddStates - Add the package to the state counter		/*{{{*/
+// ---------------------------------------------------------------------
+/* This routine is tricky to use, you must make sure that it is never
+   called twice for the same package. This means the Remove/Add section
+   should be as short as possible and not encompass any code that will
+   call Remove/Add itself. Remember, dependencies can be circular so
+   while processing a dep for Pkg it is possible that Add/Remove
+   will be called on Pkg */
+void pkgDepCache::AddStates(const PkgIterator &Pkg, bool const Invert)
+{
+   signed char const Add = (Invert == false) ? 1 : -1;
+   StateCache &State = PkgState[Pkg->ID];
+
+   // The Package is broken (either minimal dep or policy dep)
+   if ((State.DepState & DepInstMin) != DepInstMin)
+      iBrokenCount += Add;
+   if ((State.DepState & DepInstPolicy) != DepInstPolicy)
+      iPolicyBrokenCount += Add;
+
+   // Bad state
+   if (Pkg.State() != PkgIterator::NeedsNothing)
+      iBadCount += Add;
+
+   // Not installed
+   if (Pkg->CurrentVer == 0)
+   {
+      if (State.Mode == ModeDelete &&
+	  (State.iFlags & Purge) == Purge && Pkg.Purge() == false)
+	 iDelCount += Add;
+
+      if (State.Mode == ModeInstall)
+	 iInstCount += Add;
+      return;
+   }
+
+   // Installed, no upgrade
+   if (State.Status == 0)
+   {
+      if (State.Mode == ModeDelete)
+	 iDelCount += Add;
+      else
+	 if ((State.iFlags & ReInstall) == ReInstall)
+	    iInstCount += Add;
+      return;
+   }
+
+   // Alll 3 are possible
+   if (State.Mode == ModeDelete)
+      iDelCount += Add;
+   else if (State.Mode == ModeKeep)
+      iKeepCount += Add;
+   else if (State.Mode == ModeInstall)
+      iInstCount += Add;
+}
+									/*}}}*/
+// DepCache::BuildGroupOrs - Generate the Or group dep data		/*{{{*/
+// ---------------------------------------------------------------------
+/* The or group results are stored in the last item of the or group. This
+   allows easy detection of the state of a whole or'd group. */
+void pkgDepCache::BuildGroupOrs(VerIterator const &V)
+{
+   unsigned char Group = 0;
+   for (DepIterator D = V.DependsList(); D.end() != true; ++D)
+   {
+      // Build the dependency state.
+      unsigned char &State = DepState[D->ID];
+
+      /* Invert for Conflicts. We have to do this twice to get the
+         right sense for a conflicts group */
+      if (D.IsNegative() == true)
+	 State = ~State;
+
+      // Add to the group if we are within an or..
+      State &= 0x7;
+      Group |= State;
+      State |= Group << 3;
+      if ((D->CompareOp & Dep::Or) != Dep::Or)
+	 Group = 0;
+
+      // Invert for Conflicts
+      if (D.IsNegative() == true)
+	 State = ~State;
+   }
+}
+									/*}}}*/
+// DepCache::VersionState - Perform a pass over a dependency list	/*{{{*/
+// ---------------------------------------------------------------------
+/* This is used to run over a dependency list and determine the dep
+   state of the list, filtering it through both a Min check and a Policy
+   check. The return result will have SetMin/SetPolicy low if a check
+   fails. It uses the DepState cache for it's computations. */
+unsigned char pkgDepCache::VersionState(DepIterator D, unsigned char const Check,
+				       unsigned char const SetMin,
+				       unsigned char const SetPolicy) const
+{
+   unsigned char Dep = 0xFF;
+   while (D.end() != true)
+   {
+      // the last or-dependency has the state of all previous or'ed
+      DepIterator Start, End;
+      D.GlobOr(Start, End);
+      // ignore if we are called with Dep{Install,…} or DepG{Install,…}
+      // the later would be more correct, but the first is what we get
+      unsigned char const State = DepState[End->ID] | (DepState[End->ID] >> 3);
+
+      // Minimum deps that must be satisfied to have a working package
+      if (Start.IsCritical() == true)
+      {
+	 if ((State & Check) != Check)
+	    return Dep &= ~(SetMin | SetPolicy);
+      }
+      // Policy deps that must be satisfied to install the package
+      else if (IsImportantDep(Start) == true &&
+	  (State & Check) != Check)
+	 Dep &= ~SetPolicy;
+   }
+   return Dep;
+}
+									/*}}}*/
+// DepCache::DependencyState - Compute the 3 results for a dep		/*{{{*/
+// ---------------------------------------------------------------------
+/* This is the main dependency computation bit. It computes the 3 main
+   results for a dependency: Now, Install and Candidate. Callers must
+   invert the result if dealing with conflicts. */
+unsigned char pkgDepCache::DependencyState(DepIterator const &D)
+{
+   unsigned char State = 0;
+
+   if (CheckDep(D,NowVersion) == true)
+      State |= DepNow;
+   if (CheckDep(D,InstallVersion) == true)
+      State |= DepInstall;
+   if (CheckDep(D,CandidateVersion) == true)
+      State |= DepCVer;
+
+   return State;
+}
+									/*}}}*/
+// DepCache::UpdateVerState - Compute the Dep member of the state	/*{{{*/
+// ---------------------------------------------------------------------
+/* This determines the combined dependency representation of a package
+   for its two states now and install. This is done by using the pre-generated
+   dependency information. */
+void pkgDepCache::UpdateVerState(PkgIterator const &Pkg)
+{   
+   // Empty deps are always true
+   StateCache &State = PkgState[Pkg->ID];
+   State.DepState = 0xFF;
+   
+   // Check the Current state
+   if (Pkg->CurrentVer != 0)
+   {
+      DepIterator D = Pkg.CurrentVer().DependsList();
+      State.DepState &= VersionState(D,DepNow,DepNowMin,DepNowPolicy);
+   }
+   
+   /* Check the candidate state. We do not compare against the whole as
+      a candidate state but check the candidate version against the 
+      install states */
+   if (State.CandidateVer != 0)
+   {
+      DepIterator D = State.CandidateVerIter(*this).DependsList();
+      State.DepState &= VersionState(D,DepInstall,DepCandMin,DepCandPolicy);
+   }
+   
+   // Check target state which can only be current or installed
+   if (State.InstallVer != 0)
+   {
+      DepIterator D = State.InstVerIter(*this).DependsList();
+      State.DepState &= VersionState(D,DepInstall,DepInstMin,DepInstPolicy);
+   }
+}
+									/*}}}*/
+// DepCache::Update - Figure out all the state information		/*{{{*/
+// ---------------------------------------------------------------------
+/* This will figure out the state of all the packages and all the 
+   dependencies based on the current policy. */
+void pkgDepCache::PerformDependencyPass(OpProgress * const Prog)
+{
+   iUsrSize = 0;
+   iDownloadSize = 0;
+   iInstCount = 0;
+   iDelCount = 0;
+   iKeepCount = 0;
+   iBrokenCount = 0;
+   iPolicyBrokenCount = 0;
+   iBadCount = 0;
+
+   int Done = 0;
+   for (PkgIterator I = PkgBegin(); I.end() != true; ++I, ++Done)
+   {
+      if (Prog != 0 && Done%20 == 0)
+	 Prog->Progress(Done);
+      for (VerIterator V = I.VersionList(); V.end() != true; ++V)
+      {
+	 unsigned char Group = 0;
+
+	 for (DepIterator D = V.DependsList(); D.end() != true; ++D)
+	 {
+	    // Build the dependency state.
+	    unsigned char &State = DepState[D->ID];
+	    State = DependencyState(D);
+
+	    // Add to the group if we are within an or..
+	    Group |= State;
+	    State |= Group << 3;
+	    if ((D->CompareOp & Dep::Or) != Dep::Or)
+	       Group = 0;
+
+	    // Invert for Conflicts
+	    if (D.IsNegative() == true)
+	       State = ~State;
+	 }
+      }
+
+      // Compute the package dependency state and size additions
+      AddSizes(I);
+      UpdateVerState(I);
+      AddStates(I);
+   }
+   if (Prog != 0)
+      Prog->Progress(Done);
+}
+void pkgDepCache::Update(OpProgress * const Prog)
+{
+   PerformDependencyPass(Prog);
+   readStateFile(Prog);
+}
+									/*}}}*/
+// DepCache::Update - Update the deps list of a package	   		/*{{{*/
+// ---------------------------------------------------------------------
+/* This is a helper for update that only does the dep portion of the scan. 
+   It is mainly meant to scan reverse dependencies. */
+void pkgDepCache::Update(DepIterator D)
+{
+   // Update the reverse deps
+   for (;D.end() != true; ++D)
+   {      
+      unsigned char &State = DepState[D->ID];
+      State = DependencyState(D);
+    
+      // Invert for Conflicts
+      if (D.IsNegative() == true)
+	 State = ~State;
+
+      RemoveStates(D.ParentPkg());
+      BuildGroupOrs(D.ParentVer());
+      UpdateVerState(D.ParentPkg());
+      AddStates(D.ParentPkg());
+   }
+}
+									/*}}}*/
+// DepCache::Update - Update the related deps of a package		/*{{{*/
+// ---------------------------------------------------------------------
+/* This is called whenever the state of a package changes. It updates
+   all cached dependencies related to this package. */
+void pkgDepCache::Update(PkgIterator const &Pkg)
+{   
+   // Recompute the dep of the package
+   RemoveStates(Pkg);
+   UpdateVerState(Pkg);
+   AddStates(Pkg);
+   
+   // Update the reverse deps
+   Update(Pkg.RevDependsList());
+
+   // Update the provides map for the current ver
+   auto const CurVer = Pkg.CurrentVer();
+   if (not CurVer.end())
+      for (PrvIterator P = CurVer.ProvidesList(); not P.end(); ++P)
+	 Update(P.ParentPkg().RevDependsList());
+
+   // Update the provides map for the candidate ver
+   auto const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
+   if (not CandVer.end() && CandVer != CurVer)
+      for (PrvIterator P = CandVer.ProvidesList(); not P.end(); ++P)
+	 Update(P.ParentPkg().RevDependsList());
+}
+									/*}}}*/
+// DepCache::IsModeChangeOk - check if it is ok to change the mode	/*{{{*/
+// ---------------------------------------------------------------------
+/* this is used by all Mark methods on the very first line to check sanity
+   and prevents mode changes for packages on hold for example.
+   If you want to check Mode specific stuff you can use the virtual public
+   Is<Mode>Ok methods instead */
+static char const* PrintMode(char const mode)
+{
+	 switch (mode)
+	 {
+	 case pkgDepCache::ModeInstall: return "Install";
+	 case pkgDepCache::ModeKeep: return "Keep";
+	 case pkgDepCache::ModeDelete: return "Delete";
+	 case pkgDepCache::ModeGarbage: return "Garbage";
+	 default: return "UNKNOWN";
+	 }
+}
+static bool IsModeChangeOk(pkgDepCache &Cache, pkgDepCache::ModeList const mode, pkgCache::PkgIterator const &Pkg,
+			   unsigned long const Depth, bool const FromUser, bool const DebugMarker)
+{
+   // we are not trying too hard…
+   if (unlikely(Depth > 3000))
+      return false;
+
+   // general sanity
+   if (unlikely(Pkg.end() == true || Pkg->VersionList == 0))
+      return false;
+
+   // the user is always right
+   if (FromUser == true)
+      return true;
+
+   auto &P = Cache[Pkg];
+   // not changing the mode is obviously also fine as we might want to call
+   // e.g. MarkInstall multiple times with different arguments for the same package
+   if (P.Mode == mode)
+      return true;
+
+   // if previous state was set by user only user can reset it
+   if ((P.iFlags & pkgDepCache::Protected) == pkgDepCache::Protected)
+   {
+      if (unlikely(DebugMarker == true))
+	 std::clog << OutputInDepth(Depth) << "Ignore Mark" << PrintMode(mode)
+		   << " of " << APT::PrettyPkg(&Cache, Pkg) << " as its mode (" << PrintMode(P.Mode)
+		   << ") is protected" << std::endl;
+      return false;
+   }
+   // enforce dpkg holds
+   else if (mode != pkgDepCache::ModeKeep && Pkg->SelectedState == pkgCache::State::Hold &&
+	    _config->FindB("APT::Ignore-Hold",false) == false)
+   {
+      if (unlikely(DebugMarker == true))
+	 std::clog << OutputInDepth(Depth) << "Hold prevents Mark" << PrintMode(mode)
+		   << " of " << APT::PrettyPkg(&Cache, Pkg) << std::endl;
+      return false;
+   }
+   // Do not allow removals of essential packages not explicitly triggered by the user
+   else if (mode == pkgDepCache::ModeDelete && (Pkg->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential &&
+	    not _config->FindB("APT::Get::Allow-Solver-Remove-Essential", false))
+   {
+      if (unlikely(DebugMarker == true))
+	 std::clog << OutputInDepth(Depth) << "Essential prevents Mark" << PrintMode(mode)
+		   << " of " << APT::PrettyPkg(&Cache, Pkg) << std::endl;
+      return false;
+   }
+   // Do not allow removals of essential packages not explicitly triggered by the user
+   else if (mode == pkgDepCache::ModeDelete && (Pkg->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important &&
+	    not _config->FindB("APT::Get::Allow-Solver-Remove-Essential", false))
+   {
+      if (unlikely(DebugMarker == true))
+	 std::clog << OutputInDepth(Depth) << "Protected prevents Mark" << PrintMode(mode)
+		   << " of " << APT::PrettyPkg(&Cache, Pkg) << std::endl;
+      return false;
+   }
+
+   return true;
+}
+									/*}}}*/
+// DepCache::MarkKeep - Put the package in the keep state		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgDepCache::MarkKeep(PkgIterator const &Pkg, bool Soft, bool FromUser,
+                           unsigned long Depth)
+{
+   if (not IsModeChangeOk(*this, ModeKeep, Pkg, Depth, FromUser, DebugMarker))
+      return false;
+
+   /* Reject an attempt to keep a non-source broken installed package, those
+      must be upgraded */
+   if (Pkg.State() == PkgIterator::NeedsUnpack && 
+       Pkg.CurrentVer().Downloadable() == false)
+      return false;
+
+   /* We changed the soft state all the time so the UI is a bit nicer
+      to use */
+   StateCache &P = PkgState[Pkg->ID];
+
+   // Check that it is not already kept
+   if (P.Mode == ModeKeep)
+      return true;
+
+   if (Soft == true)
+      P.iFlags |= AutoKept;
+   else
+      P.iFlags &= ~AutoKept;
+
+   ActionGroup group(*this);
+
+#if 0 // resetting the autoflag here means we lose the 
+      // auto-mark information if a user selects a package for removal
+      // but changes  his mind then and sets it for keep again
+      // - this makes sense as default when all Garbage dependencies
+      //   are automatically marked for removal (as aptitude does).
+      //   setting a package for keep then makes it no longer autoinstalled
+      //   for all other use-case this action is rather surprising
+   if(FromUser && !P.Marked)
+     P.Flags &= ~Flag::Auto;
+#endif
+
+   if (DebugMarker == true)
+      std::clog << OutputInDepth(Depth) << "MarkKeep " << APT::PrettyPkg(this, Pkg) << " FU=" << FromUser << std::endl;
+
+   RemoveSizes(Pkg);
+   RemoveStates(Pkg);
+
+   P.Mode = ModeKeep;
+   if (Pkg->CurrentVer == 0)
+      P.InstallVer = 0;
+   else
+      P.InstallVer = Pkg.CurrentVer();
+
+   AddStates(Pkg);
+   Update(Pkg);
+   AddSizes(Pkg);
+
+   return true;
+}
+									/*}}}*/
+// DepCache::MarkDelete - Put the package in the delete state		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgDepCache::MarkDelete(PkgIterator const &Pkg, bool rPurge,
+                             unsigned long Depth, bool FromUser)
+{
+   if (not IsModeChangeOk(*this, ModeDelete, Pkg, Depth, FromUser, DebugMarker))
+      return false;
+
+   StateCache &P = PkgState[Pkg->ID];
+
+   // Check that it is not already marked for delete
+   if ((P.Mode == ModeDelete || P.InstallVer == 0) && 
+       (Pkg.Purge() == true || rPurge == false))
+      return true;
+
+   // check if we are allowed to remove the package
+   if (IsDeleteOk(Pkg,rPurge,Depth,FromUser) == false)
+      return false;
+
+   P.iFlags &= ~(AutoKept | Purge);
+   if (rPurge == true)
+      P.iFlags |= Purge;
+
+   ActionGroup group(*this);
+
+   if (FromUser == false)
+   {
+      VerIterator const PV = P.InstVerIter(*this);
+      if (PV.end() == false)
+      {
+	 // removed metapackages mark their dependencies as manual to prevent in "desktop depends browser, texteditor"
+	 // the removal of browser to suggest the removal of desktop and texteditor.
+	 // We ignore the auto-bit here as we can't deal with metapackage cascardes otherwise.
+	 // We do not check for or-groups here as we don't know which package takes care of
+	 // providing the feature the user likes e.g.:  browser1 | browser2 | browser3
+	 // Temporary removals are effected by this as well, which is bad, but unlikely in practice
+	 bool const PinNeverMarkAutoSection = (PV->Section != 0 && SectionInSubTree("APT::Never-MarkAuto-Sections", PV.Section()));
+	 if (PinNeverMarkAutoSection)
+	 {
+	    for (DepIterator D = PV.DependsList(); D.end() != true; ++D)
+	    {
+	       if (D.IsMultiArchImplicit() == true || D.IsNegative() == true || IsImportantDep(D) == false)
+		  continue;
+
+	       pkgCacheFile CacheFile(this);
+	       APT::VersionList verlist = APT::VersionList::FromDependency(CacheFile, D, APT::CacheSetHelper::INSTALLED);
+	       for (auto const &V : verlist)
+	       {
+		  PkgIterator const DP = V.ParentPkg();
+		  if(DebugAutoInstall == true)
+		     std::clog << OutputInDepth(Depth) << "Setting " << DP.FullName(false) << " NOT as auto-installed (direct "
+			<< D.DepType() << " of " << Pkg.FullName(false) << " which is in APT::Never-MarkAuto-Sections)" << std::endl;
+
+		  MarkAuto(DP, false);
+	       }
+	    }
+	 }
+      }
+   }
+
+   if (DebugMarker == true)
+      std::clog << OutputInDepth(Depth) << (rPurge ? "MarkPurge " : "MarkDelete ") << APT::PrettyPkg(this, Pkg) << " FU=" << FromUser << std::endl;
+
+   RemoveSizes(Pkg);
+   RemoveStates(Pkg);
+   
+   if (Pkg->CurrentVer == 0 && (Pkg.Purge() == true || rPurge == false))
+      P.Mode = ModeKeep;
+   else
+      P.Mode = ModeDelete;
+   P.InstallVer = 0;
+
+   AddStates(Pkg);   
+   Update(Pkg);
+   AddSizes(Pkg);
+
+   return true;
+}
+									/*}}}*/
+// DepCache::IsDeleteOk - check if it is ok to remove this package	/*{{{*/
+// ---------------------------------------------------------------------
+/* The default implementation tries to prevent deletion of install requests.
+   dpkg holds are enforced by the private IsModeChangeOk */
+bool pkgDepCache::IsDeleteOk(PkgIterator const &Pkg,bool rPurge,
+			      unsigned long Depth, bool FromUser)
+{
+   return IsDeleteOkProtectInstallRequests(Pkg, rPurge, Depth, FromUser);
+}
+bool pkgDepCache::IsDeleteOkProtectInstallRequests(PkgIterator const &Pkg,
+      bool const /*rPurge*/, unsigned long const Depth, bool const FromUser)
+{
+   if (FromUser == false && Pkg->CurrentVer == 0)
+   {
+      StateCache &P = PkgState[Pkg->ID];
+      if (P.InstallVer != 0 && P.Status == 2 && (P.Flags & Flag::Auto) != Flag::Auto)
+      {
+	 if (DebugMarker == true)
+	    std::clog << OutputInDepth(Depth) << "Manual install request prevents MarkDelete of " << APT::PrettyPkg(this, Pkg) << std::endl;
+	 return false;
+      }
+   }
+   return true;
+}
+									/*}}}*/
+struct CompareProviders							/*{{{*/
+{
+   pkgDepCache const &Cache;
+   pkgCache::PkgIterator const Pkg;
+   explicit CompareProviders(pkgDepCache const &pCache, pkgCache::DepIterator const &Dep) : Cache{pCache}, Pkg{Dep.TargetPkg()} {}
+   bool operator() (pkgCache::VerIterator const &AV, pkgCache::VerIterator const &BV)
+   {
+      pkgCache::PkgIterator const A = AV.ParentPkg();
+      pkgCache::PkgIterator const B = BV.ParentPkg();
+      // Deal with protected first as if they don't work we usually have a problem
+      if (Cache[A].Protect() != Cache[B].Protect())
+	 return Cache[A].Protect();
+      // Prefer MA:same packages if other architectures for it are installed
+      if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same ||
+	  (BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
+      {
+	 bool instA = false;
+	 if ((AV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
+	 {
+	    pkgCache::GrpIterator Grp = A.Group();
+	    for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
+	       if (P->CurrentVer != 0)
+	       {
+		  instA = true;
+		  break;
+	       }
+	 }
+	 bool instB = false;
+	 if ((BV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
+	 {
+	    pkgCache::GrpIterator Grp = B.Group();
+	    for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
+	    {
+	       if (P->CurrentVer != 0)
+	       {
+		  instB = true;
+		  break;
+	       }
+	    }
+	 }
+	 if (instA != instB)
+	    return instA;
+      }
+      if ((A->CurrentVer == 0 || B->CurrentVer == 0) && A->CurrentVer != B->CurrentVer)
+	 return A->CurrentVer != 0;
+      // Prefer packages in the same group as the target; e.g. foo:i386, foo:amd64
+      if (A->Group != B->Group)
+      {
+	 if (A->Group == Pkg->Group && B->Group != Pkg->Group)
+	    return true;
+	 else if (B->Group == Pkg->Group && A->Group != Pkg->Group)
+	    return false;
+      }
+      // we like essentials
+      if ((A->Flags & pkgCache::Flag::Essential) != (B->Flags & pkgCache::Flag::Essential))
+      {
+	 if ((A->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
+	    return true;
+	 else if ((B->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential)
+	    return false;
+      }
+      if ((A->Flags & pkgCache::Flag::Important) != (B->Flags & pkgCache::Flag::Important))
+      {
+	 if ((A->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
+	    return true;
+	 else if ((B->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important)
+	    return false;
+      }
+      // prefer native architecture
+      if (strcmp(A.Arch(), B.Arch()) != 0)
+      {
+	 if (strcmp(A.Arch(), A.Cache()->NativeArch()) == 0)
+	    return true;
+	 else if (strcmp(B.Arch(), B.Cache()->NativeArch()) == 0)
+	    return false;
+	 std::vector<std::string> archs = APT::Configuration::getArchitectures();
+	 for (std::vector<std::string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
+	    if (*a == A.Arch())
+	       return true;
+	    else if (*a == B.Arch())
+	       return false;
+      }
+      // higher priority seems like a good idea
+      if (AV->Priority != BV->Priority)
+	 return AV->Priority < BV->Priority;
+      // unable to decide…
+      return A->ID > B->ID;
+   }
+};
+									/*}}}*/
+bool pkgDepCache::MarkInstall_StateChange(pkgCache::PkgIterator const &Pkg, bool AutoInst, bool FromUser) /*{{{*/
+{
+   bool AlwaysMarkAsAuto = _config->FindB("APT::Get::Mark-Auto", false) == true;
+   auto &P = (*this)[Pkg];
+   if (P.Protect() && P.InstallVer == P.CandidateVer)
+      return true;
+
+   P.iFlags &= ~pkgDepCache::AutoKept;
+
+   /* Target the candidate version and remove the autoflag. We reset the
+      autoflag below if this was called recursively. Otherwise the user
+      should have the ability to de-auto a package by changing its state */
+   RemoveSizes(Pkg);
+   RemoveStates(Pkg);
+
+   P.Mode = pkgDepCache::ModeInstall;
+   P.InstallVer = P.CandidateVer;
+
+   if(FromUser && !AlwaysMarkAsAuto)
+     {
+       // Set it to manual if it's a new install or already installed,
+       // but only if its not marked by the autoremover (aptitude depend on this behavior)
+       // or if we do automatic installation (aptitude never does it)
+       if(P.Status == 2 || (Pkg->CurrentVer != 0 && (AutoInst == true || P.Marked == false)))
+	 P.Flags &= ~pkgCache::Flag::Auto;
+     }
+   else
+     {
+       // Set it to auto if this is a new install.
+       if(P.Status == 2)
+	 P.Flags |= pkgCache::Flag::Auto;
+     }
+   if (P.CandidateVer == (pkgCache::Version *)Pkg.CurrentVer())
+      P.Mode = pkgDepCache::ModeKeep;
+
+   AddStates(Pkg);
+   Update(Pkg);
+   AddSizes(Pkg);
+   return true;
+}
+									/*}}}*/
+static bool MarkInstall_DiscardCandidate(pkgDepCache &Cache, pkgCache::PkgIterator const &Pkg) /*{{{*/
+{
+   auto &State = Cache[Pkg];
+   State.CandidateVer = State.InstallVer;
+   auto const oldStatus = State.Status;
+   State.Update(Pkg, Cache);
+   State.Status = oldStatus;
+   return true;
+}
+									/*}}}*/
+bool pkgDepCache::MarkInstall_DiscardInstall(pkgCache::PkgIterator const &Pkg) /*{{{*/
+{
+   StateCache &State = PkgState[Pkg->ID];
+   if (State.Mode == ModeKeep && State.InstallVer == State.CandidateVer && State.CandidateVer == Pkg.CurrentVer())
+      return true;
+   RemoveSizes(Pkg);
+   RemoveStates(Pkg);
+   if (Pkg->CurrentVer != 0)
+      State.InstallVer = Pkg.CurrentVer();
+   else
+      State.InstallVer = nullptr;
+   State.Mode = ModeKeep;
+   AddStates(Pkg);
+   Update(Pkg);
+   AddSizes(Pkg);
+   return MarkInstall_DiscardCandidate(*this, Pkg);
+}
+									/*}}}*/
+static bool MarkInstall_CollectDependencies(pkgDepCache const &Cache, pkgCache::VerIterator const &PV, std::vector<pkgCache::DepIterator> &toInstall, std::vector<pkgCache::DepIterator> &toRemove) /*{{{*/
+{
+   auto const propagateProtected = Cache[PV.ParentPkg()].Protect();
+   for (auto Dep = PV.DependsList(); not Dep.end();)
+   {
+      auto const Start = Dep;
+      // check if an installed package satisfies the dependency (and get the extend of the or-group)
+      bool foundSolution = false;
+      for (bool LastOR = true; not Dep.end() && LastOR; ++Dep)
+      {
+	 LastOR = (Dep->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
+	 if ((Cache[Dep] & pkgDepCache::DepInstall) == pkgDepCache::DepInstall)
+	    foundSolution = true;
+      }
+      if (foundSolution && not propagateProtected)
+	 continue;
+
+      /* Check if this dep should be consider for install.
+         (Pre-)Depends, Conflicts and Breaks for sure.
+         Recommends & Suggests depending on configuration */
+      if (not Cache.IsImportantDep(Start))
+	 continue;
+
+      if (Start.IsNegative())
+      {
+	 if (Start->Type != pkgCache::Dep::Obsoletes)
+	    toRemove.push_back(Start);
+      }
+      else
+	 toInstall.push_back(Start);
+   }
+   return true;
+}
+									/*}}}*/
+static APT::VersionVector getAllPossibleSolutions(pkgDepCache &Cache, pkgCache::DepIterator Start, pkgCache::DepIterator const &End, APT::CacheSetHelper::VerSelector const selector, bool const sorted) /*{{{*/
+{
+   pkgCacheFile CacheFile{&Cache};
+   APT::VersionVector toUpgrade, toNewInstall;
+   do
+   {
+      APT::VersionVector verlist = APT::VersionVector::FromDependency(CacheFile, Start, selector);
+      if (not sorted)
+      {
+	 std::move(verlist.begin(), verlist.end(), std::back_inserter(toUpgrade));
+	 continue;
+      }
+      std::sort(verlist.begin(), verlist.end(), CompareProviders{Cache, Start});
+      for (auto &&Ver : verlist)
+      {
+	 auto P = Ver.ParentPkg();
+	 if (P->CurrentVer != 0)
+	    toUpgrade.emplace_back(std::move(Ver));
+	 else
+	    toNewInstall.emplace_back(std::move(Ver));
+      }
+   } while (Start++ != End);
+   if (toUpgrade.empty())
+      toUpgrade = std::move(toNewInstall);
+   else
+      std::move(toNewInstall.begin(), toNewInstall.end(), std::back_inserter(toUpgrade));
+
+   if (not sorted)
+      std::sort(toUpgrade.begin(), toUpgrade.end(), [](pkgCache::VerIterator const &A, pkgCache::VerIterator const &B) { return A->ID < B->ID; });
+   toUpgrade.erase(std::unique(toUpgrade.begin(), toUpgrade.end()), toUpgrade.end());
+
+   if (not End.IsNegative())
+      toUpgrade.erase(std::remove_if(toUpgrade.begin(), toUpgrade.end(), [&Cache](pkgCache::VerIterator const &V) {
+			 auto const P = V.ParentPkg();
+			 auto const &State = Cache[P];
+			 return State.Protect() && (State.Delete() || (State.Keep() && P->CurrentVer == 0));
+		      }),
+		      toUpgrade.end());
+
+   return toUpgrade;
+}
+									/*}}}*/
+static bool MarkInstall_MarkDeleteForNotUpgradeable(pkgDepCache &Cache, bool const DebugAutoInstall, pkgCache::VerIterator const &PV, unsigned long const Depth, pkgCache::PkgIterator const &Pkg, bool const propagateProtected, APT::PackageVector &delayedRemove)/*{{{*/
+{
+   auto &State = Cache[Pkg];
+   if (not propagateProtected)
+   {
+      if (State.Delete())
+	 return true;
+      if(DebugAutoInstall)
+	 std::clog << OutputInDepth(Depth) << " Delayed Removing: " << Pkg.FullName() << " as upgrade is not an option for " << PV.ParentPkg().FullName() << " (" << PV.VerStr() << ")\n";
+      if (not IsModeChangeOk(Cache, pkgDepCache::ModeDelete, Pkg, Depth, false, DebugAutoInstall) ||
+	  not Cache.IsDeleteOk(Pkg, false, Depth, false))
+	 return false;
+      delayedRemove.push_back(Pkg);
+      return true;
+   }
+
+   if (not State.Delete())
+   {
+      if(DebugAutoInstall)
+	 std::clog << OutputInDepth(Depth) << " Removing: " << Pkg.FullName() << " as upgrade is not an option for " << PV.ParentPkg().FullName() << " (" << PV.VerStr() << ")\n";
+      if (not Cache.MarkDelete(Pkg, false, Depth + 1, false))
+	 return false;
+   }
+   MarkInstall_DiscardCandidate(Cache, Pkg);
+   Cache.MarkProtected(Pkg);
+   return true;
+}
+									/*}}}*/
+static bool MarkInstall_RemoveConflictsIfNotUpgradeable(pkgDepCache &Cache, bool const DebugAutoInstall, pkgCache::VerIterator const &PV, unsigned long Depth, std::vector<pkgCache::DepIterator> &toRemove, APT::PackageVector &toUpgrade, APT::PackageVector &delayedRemove, bool const propagateProtected, bool const FromUser) /*{{{*/
+{
+   /* Negative dependencies have no or-group
+      If the candidate is effected try to keep current and discard candidate
+      If the current is effected try upgrading to candidate or remove it */
+   bool failedToRemoveSomething = false;
+   APT::PackageVector badCandidate;
+   for (auto const &D : toRemove)
+   {
+      for (auto const &Ver : getAllPossibleSolutions(Cache, D, D, APT::CacheSetHelper::CANDIDATE, true))
+      {
+	 auto const Pkg = Ver.ParentPkg();
+	 auto &State = Cache[Pkg];
+	 if (State.CandidateVer != Ver)
+	    continue;
+	 if (Pkg.CurrentVer() != Ver)
+	 {
+	    if (State.Install() && not Cache.MarkKeep(Pkg, false, false, Depth))
+	    {
+	       failedToRemoveSomething = true;
+	       if (not propagateProtected && not FromUser)
+		  break;
+	    }
+	    else if (propagateProtected)
+	    {
+	       MarkInstall_DiscardCandidate(Cache, Pkg);
+	       if (Pkg->CurrentVer == 0)
+		  Cache.MarkProtected(Pkg);
+	    }
+	    else
+	       badCandidate.push_back(Pkg);
+	 }
+	 else if (not MarkInstall_MarkDeleteForNotUpgradeable(Cache, DebugAutoInstall, PV, Depth, Pkg, propagateProtected, delayedRemove))
+	 {
+	    failedToRemoveSomething = true;
+	    if (not propagateProtected && not FromUser)
+	       break;
+	 }
+      }
+      if (failedToRemoveSomething && not propagateProtected && not FromUser)
+	 break;
+      for (auto const &Ver : getAllPossibleSolutions(Cache, D, D, APT::CacheSetHelper::INSTALLED, true))
+      {
+	 auto const Pkg = Ver.ParentPkg();
+	 auto &State = Cache[Pkg];
+	 if (State.CandidateVer != Ver && State.CandidateVer != nullptr &&
+	     std::find(badCandidate.cbegin(), badCandidate.cend(), Pkg) == badCandidate.end())
+	    toUpgrade.push_back(Pkg);
+	 else if (State.CandidateVer == Pkg.CurrentVer())
+	    ; // already done in the first loop above
+	 else if (not MarkInstall_MarkDeleteForNotUpgradeable(Cache, DebugAutoInstall, PV, Depth, Pkg, propagateProtected, delayedRemove))
+	 {
+	    failedToRemoveSomething = true;
+	    if (not propagateProtected && not FromUser)
+	       break;
+	 }
+      }
+      if (failedToRemoveSomething && not propagateProtected && not FromUser)
+	 break;
+   }
+   toRemove.clear();
+   return not failedToRemoveSomething;
+}
+									/*}}}*/
+static bool MarkInstall_CollectReverseDepends(pkgDepCache &Cache, bool const DebugAutoInstall, pkgCache::VerIterator const &PV, unsigned long Depth, APT::PackageVector &toUpgrade) /*{{{*/
+{
+   auto CurrentVer = PV.ParentPkg().CurrentVer();
+   if (CurrentVer.end())
+      return true;
+   for (pkgCache::DepIterator D = PV.ParentPkg().RevDependsList(); D.end() == false; ++D)
+   {
+      auto ParentPkg = D.ParentPkg();
+      // Skip non-installed versions and packages already marked for upgrade
+      if (ParentPkg.CurrentVer() != D.ParentVer() || Cache[ParentPkg].Install())
+	 continue;
+      // We only handle important positive dependencies, RemoveConflictsIfNotUpgradeable handles negative
+      if (not Cache.IsImportantDep(D) || D.IsNegative())
+	 continue;
+      // The dependency was previously not satisfied (e.g. part of an or group) or will be satisfied, so it's OK
+      if (not D.IsSatisfied(CurrentVer) || D.IsSatisfied(PV))
+	 continue;
+      if (std::find(toUpgrade.begin(), toUpgrade.end(), ParentPkg) != toUpgrade.end())
+	 continue;
+
+      if (DebugAutoInstall)
+	 std::clog << OutputInDepth(Depth) << " Upgrading: " << APT::PrettyPkg(&Cache, ParentPkg) << " due to " << APT::PrettyDep(&Cache, D) << "\n";
+
+      toUpgrade.push_back(ParentPkg);
+   }
+   return true;
+}
+									/*}}}*/
+static bool MarkInstall_UpgradeOrRemoveConflicts(pkgDepCache &Cache, bool const DebugAutoInstall, unsigned long Depth, bool const ForceImportantDeps, APT::PackageVector &toUpgrade, bool const propagateProtected, bool const FromUser) /*{{{*/
+{
+   bool failedToRemoveSomething = false;
+   for (auto const &InstPkg : toUpgrade)
+      if (not Cache[InstPkg].Install() && not Cache.MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps))
+      {
+	 if (DebugAutoInstall)
+	    std::clog << OutputInDepth(Depth) << " Removing: " << InstPkg.FullName() << " as upgrade is not possible\n";
+	 if (not Cache.MarkDelete(InstPkg, false, Depth + 1, false))
+	 {
+	    failedToRemoveSomething = true;
+	    if (not propagateProtected && not FromUser)
+	       break;
+	 }
+	 else if (propagateProtected)
+	    Cache.MarkProtected(InstPkg);
+      }
+   toUpgrade.clear();
+   return not failedToRemoveSomething;
+}
+									/*}}}*/
+static bool MarkInstall_UpgradeOtherBinaries(pkgDepCache &Cache, bool const DebugAutoInstall, unsigned long Depth, bool const ForceImportantDeps, pkgCache::PkgIterator Pkg, pkgCache::VerIterator Ver) /*{{{*/
+{
+   APT::PackageSet toUpgrade;
+
+   if (not _config->FindB("APT::Get::Upgrade-By-Source-Package", true))
+      return true;
+
+   auto SrcGrp = Cache.FindGrp(Ver.SourcePkgName());
+   for (auto OtherBinary = SrcGrp.VersionsInSource(); not OtherBinary.end(); OtherBinary = OtherBinary.NextInSource())
+   {
+      auto OtherPkg = OtherBinary.ParentPkg();
+      auto OtherState = Cache[OtherPkg];
+      if (OtherPkg == Pkg)
+	 continue;
+      // Package is not installed or at right version, don't need to upgrade
+      if (OtherPkg->CurrentVer == 0 || OtherPkg.CurrentVer() == OtherBinary)
+	 continue;
+      // Package is to be installed at right version, don't need to upgrade
+      if (OtherState.Install() && OtherState.InstallVer == OtherBinary)
+	 continue;
+      // Package has a different source version than us, so it's not relevant
+      if (strcmp(OtherBinary.SourceVerStr(), Ver.SourceVerStr()) != 0 || OtherState.CandidateVer != OtherBinary)
+	 continue;
+      if (DebugAutoInstall)
+	 std::clog << OutputInDepth(Depth) << "Upgrading " << APT::PrettyPkg(&Cache, OtherPkg) << " due to " << Pkg.FullName() << '\n';
+
+      toUpgrade.insert(OtherPkg);
+   }
+   for (auto &OtherPkg : toUpgrade)
+      Cache.MarkInstall(OtherPkg, false, Depth + 1, false, ForceImportantDeps);
+   for (auto &OtherPkg : toUpgrade)
+      Cache.MarkInstall(OtherPkg, true, Depth + 1, false, ForceImportantDeps);
+   return true;
+}
+									/*}}}*/
+static bool MarkInstall_InstallDependencies(pkgDepCache &Cache, bool const DebugAutoInstall, bool const DebugMarker, pkgCache::PkgIterator const &Pkg, unsigned long Depth, bool const ForceImportantDeps, std::vector<pkgCache::DepIterator> &toInstall, APT::PackageVector *const toMoveAuto, bool const propagateProtected, bool const FromUser) /*{{{*/
+{
+   auto const IsSatisfiedByInstalled = [&](auto &D) { return (Cache[pkgCache::DepIterator{Cache, &D}] & pkgDepCache::DepInstall) == pkgDepCache::DepInstall; };
+   bool failedToInstallSomething = false;
+   for (auto &&Dep : toInstall)
+   {
+      auto const Copy = Dep;
+      pkgCache::DepIterator Start, End;
+      Dep.GlobOr(Start, End);
+      bool foundSolution = std::any_of(Start, Dep, IsSatisfiedByInstalled);
+      if (foundSolution && not propagateProtected)
+	 continue;
+      bool const IsCriticalDep = Start.IsCritical();
+      if (foundSolution)
+      {
+	 // try propagating protected to this satisfied dependency
+	 if (not IsCriticalDep)
+	    continue;
+	 auto const possibleSolutions = getAllPossibleSolutions(Cache, Start, End, APT::CacheSetHelper::CANDANDINST, false);
+	 if (possibleSolutions.size() != 1)
+	    continue;
+	 auto const InstPkg = possibleSolutions.begin().ParentPkg();
+	 if (Cache[InstPkg].Protect())
+	    continue;
+	 Cache.MarkProtected(InstPkg);
+	 if (not Cache.MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps))
+	    failedToInstallSomething = true;
+	 continue;
+      }
+
+      /* Check if any ImportantDep() (but not Critical) were added
+       * since we installed the package.  Also check for deps that
+       * were satisfied in the past: for instance, if a version
+       * restriction in a Recommends was tightened, upgrading the
+       * package should follow that Recommends rather than causing the
+       * dependency to be removed. (bug #470115)
+       */
+      if (Pkg->CurrentVer != 0 && not ForceImportantDeps && not IsCriticalDep)
+      {
+	 bool isNewImportantDep = true;
+	 bool isPreviouslySatisfiedImportantDep = false;
+	 for (pkgCache::DepIterator D = Pkg.CurrentVer().DependsList(); D.end() != true; ++D)
+	 {
+	    //FIXME: Should we handle or-group better here?
+	    // We do not check if the package we look for is part of the same or-group
+	    // we might find while searching, but could that really be a problem?
+	    if (D.IsCritical() || not Cache.IsImportantDep(D) ||
+		Start.TargetPkg() != D.TargetPkg())
+	       continue;
+
+	    isNewImportantDep = false;
+
+	    while ((D->CompareOp & pkgCache::Dep::Or) != 0)
+	       ++D;
+
+	    isPreviouslySatisfiedImportantDep = ((Cache[D] & pkgDepCache::DepGNow) != 0);
+	    if (isPreviouslySatisfiedImportantDep)
+	       break;
+	 }
+
+	 if (isNewImportantDep)
+	 {
+	    if (DebugAutoInstall)
+	       std::clog << OutputInDepth(Depth) << "new important dependency: "
+			 << Start.TargetPkg().FullName() << '\n';
+	 }
+	 else if (isPreviouslySatisfiedImportantDep)
+	 {
+	    if (DebugAutoInstall)
+	       std::clog << OutputInDepth(Depth) << "previously satisfied important dependency on "
+			 << Start.TargetPkg().FullName() << '\n';
+	 }
+	 else
+	 {
+	    if (DebugAutoInstall)
+	       std::clog << OutputInDepth(Depth) << "ignore old unsatisfied important dependency on "
+			 << Start.TargetPkg().FullName() << '\n';
+	    continue;
+	 }
+      }
+
+      auto const possibleSolutions = getAllPossibleSolutions(Cache, Start, End, APT::CacheSetHelper::CANDIDATE, true);
+      for (auto const &InstVer : possibleSolutions)
+      {
+	 auto const InstPkg = InstVer.ParentPkg();
+	 if (Cache[InstPkg].CandidateVer != InstVer)
+	    continue;
+	 if (DebugAutoInstall)
+	    std::clog << OutputInDepth(Depth) << "Installing " << InstPkg.FullName()
+		      << " as " << End.DepType() << " of " << Pkg.FullName() << '\n';
+	 if (propagateProtected && IsCriticalDep && possibleSolutions.size() == 1)
+	 {
+	    if (not Cache.MarkInstall(InstPkg, false, Depth + 1, false, ForceImportantDeps))
+	       continue;
+	    Cache.MarkProtected(InstPkg);
+	 }
+	 if (not Cache.MarkInstall(InstPkg, true, Depth + 1, false, ForceImportantDeps))
+	    continue;
+
+	 if (toMoveAuto != nullptr && InstPkg->CurrentVer == 0)
+	    toMoveAuto->push_back(InstPkg);
+
+	 foundSolution = true;
+	 break;
+      }
+      if (DebugMarker && not foundSolution)
+	 std::clog << OutputInDepth(Depth+1) << APT::PrettyDep(&Cache, Copy) << " can't be satisfied! (dep)\n";
+      if (not foundSolution && IsCriticalDep)
+      {
+	 failedToInstallSomething = true;
+	 if (not propagateProtected && not FromUser)
+	    break;
+      }
+   }
+   toInstall.clear();
+   return not failedToInstallSomething;
+}
+									/*}}}*/
+// DepCache::MarkInstall - Put the package in the install state		/*{{{*/
+bool pkgDepCache::MarkInstall(PkgIterator const &Pkg, bool AutoInst,
+			      unsigned long Depth, bool FromUser,
+			      bool ForceImportantDeps)
+{
+   StateCache &P = PkgState[Pkg->ID];
+   if (P.Protect() && P.Keep() && P.CandidateVer != nullptr && P.CandidateVer == Pkg.CurrentVer())
+      ; // we are here to mark our dependencies as protected, no state is changed
+   else if (not IsModeChangeOk(*this, ModeInstall, Pkg, Depth, FromUser, DebugMarker))
+      return false;
+
+
+   // See if there is even any possible installation candidate
+   if (P.CandidateVer == 0)
+      return false;
+
+   // Check that it is not already marked for install and that it can be installed
+   if (not P.Protect() && not P.InstPolicyBroken() && not P.InstBroken())
+   {
+      if (P.CandidateVer == Pkg.CurrentVer())
+      {
+	 if (P.InstallVer == 0)
+	    return MarkKeep(Pkg, false, FromUser, Depth + 1);
+	 return true;
+      }
+      else if (P.Mode == ModeInstall)
+	 return true;
+   }
+
+   // check if we are allowed to install the package
+   if (not IsInstallOk(Pkg, AutoInst, Depth, FromUser))
+      return false;
+
+   ActionGroup group(*this);
+   if (FromUser && not MarkInstall_StateChange(Pkg, AutoInst, FromUser))
+      return false;
+
+   bool const AutoSolve = AutoInst && _config->Find("APT::Solver", "internal") == "internal";
+   bool const failEarly = not P.Protect() && not FromUser;
+   bool hasFailed = false;
+
+   std::vector<pkgCache::DepIterator> toInstall, toRemove;
+   APT::PackageVector toUpgrade, delayedRemove;
+   if (AutoSolve)
+   {
+      VerIterator const PV = P.CandidateVerIter(*this);
+      if (unlikely(PV.end()))
+	 return false;
+      if (not MarkInstall_CollectDependencies(*this, PV, toInstall, toRemove))
+	 return false;
+
+      if (not MarkInstall_RemoveConflictsIfNotUpgradeable(*this, DebugAutoInstall, PV, Depth, toRemove, toUpgrade, delayedRemove, P.Protect(), FromUser))
+      {
+	 if (failEarly)
+	    return false;
+	 hasFailed = true;
+      }
+      if (not MarkInstall_CollectReverseDepends(*this, DebugAutoInstall, PV, Depth, toUpgrade))
+      {
+	 if (failEarly)
+	    return false;
+	 hasFailed = true;
+      }
+   }
+
+   if (not FromUser && not MarkInstall_StateChange(Pkg, AutoInst, FromUser))
+      return false;
+
+   if (not AutoSolve)
+      return not hasFailed;
+
+   if (DebugMarker)
+      std::clog << OutputInDepth(Depth) << "MarkInstall " << APT::PrettyPkg(this, Pkg) << " FU=" << FromUser << '\n';
+
+   class ScopedProtected
+   {
+      pkgDepCache::StateCache &P;
+      bool const already;
+
+      public:
+      ScopedProtected(pkgDepCache::StateCache &p) : P{p}, already{P.Protect()}
+      {
+	 if (not already)
+	    P.iFlags |= Protected;
+      }
+      ~ScopedProtected()
+      {
+	 if (not already)
+	    P.iFlags &= (~Protected);
+      }
+      operator bool() noexcept { return already; }
+   } propagateProtected{PkgState[Pkg->ID]};
+
+   if (not MarkInstall_UpgradeOtherBinaries(*this, DebugAutoInstall, Depth, ForceImportantDeps, Pkg, P.CandidateVerIter(*this)))
+      return false;
+   if (not MarkInstall_UpgradeOrRemoveConflicts(*this, DebugAutoInstall, Depth, ForceImportantDeps, toUpgrade, propagateProtected, FromUser))
+   {
+      if (failEarly)
+      {
+	 MarkInstall_DiscardInstall(Pkg);
+	 return false;
+      }
+      hasFailed = true;
+   }
+
+   bool const MoveAutoBitToDependencies = [&]() {
+      VerIterator const PV = P.InstVerIter(*this);
+      if (unlikely(PV.end()))
+	 return false;
+      if (PV->Section == 0 || (P.Flags & Flag::Auto) == Flag::Auto)
+	 return false;
+      VerIterator const CurVer = Pkg.CurrentVer();
+      if (not CurVer.end() && CurVer->Section != 0 && strcmp(CurVer.Section(), PV.Section()) != 0)
+      {
+	 bool const CurVerInMoveSection = SectionInSubTree("APT::Move-Autobit-Sections", CurVer.Section());
+	 bool const InstVerInMoveSection = SectionInSubTree("APT::Move-Autobit-Sections", PV.Section());
+	 return (not CurVerInMoveSection && InstVerInMoveSection);
+      }
+      return false;
+   }();
+
+   APT::PackageVector toMoveAuto;
+   if (not MarkInstall_InstallDependencies(*this, DebugAutoInstall, DebugMarker, Pkg, Depth, ForceImportantDeps, toInstall,
+					   MoveAutoBitToDependencies ? &toMoveAuto : nullptr, propagateProtected, FromUser))
+   {
+      if (failEarly)
+      {
+	 MarkInstall_DiscardInstall(Pkg);
+	 return false;
+      }
+      hasFailed = true;
+   }
+
+   for (auto const &R : delayedRemove)
+   {
+      if (not MarkDelete(R, false, Depth, false))
+      {
+	 if (failEarly)
+	 {
+	    MarkInstall_DiscardInstall(Pkg);
+	    return false;
+	 }
+	 hasFailed = true;
+      }
+   }
+
+   if (MoveAutoBitToDependencies)
+   {
+      if (DebugAutoInstall)
+	 std::clog << OutputInDepth(Depth) << "Setting " << Pkg.FullName(false) << " as auto-installed, moving manual to its dependencies" << std::endl;
+      MarkAuto(Pkg, true);
+      for (auto const &InstPkg : toMoveAuto)
+      {
+	 if (DebugAutoInstall)
+	    std::clog << OutputInDepth(Depth) << "Setting " << InstPkg.FullName(false) << " NOT as auto-installed (dependency"
+		      << " of " << Pkg.FullName(false) << " which is manual and in APT::Move-Autobit-Sections)\n";
+	 MarkAuto(InstPkg, false);
+      }
+   }
+   return not hasFailed;
+}
+									/*}}}*/
+// DepCache::IsInstallOk - check if it is ok to install this package	/*{{{*/
+// ---------------------------------------------------------------------
+/* The default implementation checks if the installation of an M-A:same
+   package would lead us into a version-screw and if so forbids it.
+   dpkg holds are enforced by the private IsModeChangeOk */
+bool pkgDepCache::IsInstallOk(PkgIterator const &Pkg,bool AutoInst,
+			      unsigned long Depth, bool FromUser)
+{
+   return IsInstallOkMultiArchSameVersionSynced(Pkg,AutoInst, Depth, FromUser) &&
+      IsInstallOkDependenciesSatisfiableByCandidates(Pkg,AutoInst, Depth, FromUser);
+}
+bool pkgDepCache::IsInstallOkMultiArchSameVersionSynced(PkgIterator const &Pkg,
+      bool const /*AutoInst*/, unsigned long const Depth, bool const FromUser)
+{
+   if (FromUser == true) // as always: user is always right
+      return true;
+
+   // if we have checked before and it was okay, it will still be okay
+   if (PkgState[Pkg->ID].Mode == ModeInstall &&
+	 PkgState[Pkg->ID].InstallVer == PkgState[Pkg->ID].CandidateVer)
+      return true;
+
+   // ignore packages with none-M-A:same candidates
+   VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
+   if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer() ||
+	 (CandVer->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
+      return true;
+
+   GrpIterator const Grp = Pkg.Group();
+   for (PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
+   {
+      // not installed or self-check: fine by definition
+      if (P->CurrentVer == 0 || P == Pkg)
+	 continue;
+
+      // not having a candidate or being in sync
+      // (simple string-compare as stuff like '1' == '0:1-0' can't happen here)
+      VerIterator CV = PkgState[P->ID].CandidateVerIter(*this);
+      if (CV.end() == true || strcmp(CandVer.VerStr(), CV.VerStr()) == 0)
+	 continue;
+
+      // packages losing M-A:same can be out-of-sync
+      if ((CV->MultiArch & pkgCache::Version::Same) != pkgCache::Version::Same)
+	 continue;
+
+      // not downloadable means the package is obsolete, so allow out-of-sync
+      if (CV.Downloadable() == false)
+	 continue;
+
+      PkgState[Pkg->ID].iFlags |= AutoKept;
+      if (unlikely(DebugMarker == true))
+	 std::clog << OutputInDepth(Depth) << "Ignore MarkInstall of " << APT::PrettyPkg(this, Pkg)
+	    << " as it is not in sync with its M-A:same sibling " << APT::PrettyPkg(this, P)
+	    << " (" << CandVer.VerStr() << " != " << CV.VerStr() << ")" << std::endl;
+      return false;
+   }
+
+   return true;
+}
+bool pkgDepCache::IsInstallOkDependenciesSatisfiableByCandidates(PkgIterator const &Pkg,
+      bool const AutoInst, unsigned long const Depth, bool const /*FromUser*/)
+{
+   if (AutoInst == false)
+      return true;
+
+   VerIterator const CandVer = PkgState[Pkg->ID].CandidateVerIter(*this);
+   if (unlikely(CandVer.end() == true) || CandVer == Pkg.CurrentVer())
+      return true;
+
+   for (DepIterator Dep = CandVer.DependsList(); Dep.end() != true;)
+   {
+      DepIterator Start = Dep;
+      bool foundSolution = false;
+      unsigned Ors = 0;
+      // Is it possible to satisfy this dependency?
+      for (bool LastOR = true; not Dep.end() && LastOR; ++Dep, ++Ors)
+      {
+	 LastOR = (Dep->CompareOp & Dep::Or) == Dep::Or;
+
+	 if ((DepState[Dep->ID] & (DepInstall | DepCVer)) != 0)
+	    foundSolution = true;
+      }
+
+      if (foundSolution || not Start.IsCritical() || Start.IsNegative())
+	 continue;
+
+      if (DebugAutoInstall == true)
+	 std::clog << OutputInDepth(Depth) << APT::PrettyDep(this, Start) << " can't be satisfied!" << std::endl;
+
+      // the dependency is critical, but can't be installed, so discard the candidate
+      // as the problemresolver will trip over it otherwise trying to install it (#735967)
+      StateCache &State = PkgState[Pkg->ID];
+      if (not State.Protect())
+      {
+	 if (Pkg->CurrentVer != 0)
+	    SetCandidateVersion(Pkg.CurrentVer());
+	 else
+	    State.CandidateVer = nullptr;
+	 if (not State.Delete())
+	 {
+	    State.Mode = ModeKeep;
+	    State.Update(Pkg, *this);
+	 }
+      }
+      return false;
+   }
+
+   return true;
+}
+									/*}}}*/
+// DepCache::SetReInstall - Set the reinstallation flag			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgDepCache::SetReInstall(PkgIterator const &Pkg,bool To)
+{
+   if (unlikely(Pkg.end() == true))
+      return;
+
+   APT::PackageList pkglist;
+   if (Pkg->CurrentVer != 0 &&
+       (Pkg.CurrentVer()-> MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same)
+   {
+      pkgCache::GrpIterator Grp = Pkg.Group();
+      for (pkgCache::PkgIterator P = Grp.PackageList(); P.end() == false; P = Grp.NextPkg(P))
+      {
+	 if (P->CurrentVer != 0)
+	    pkglist.insert(P);
+      }
+   }
+   else
+      pkglist.insert(Pkg);
+
+   ActionGroup group(*this);
+
+   for (APT::PackageList::const_iterator Pkg = pkglist.begin(); Pkg != pkglist.end(); ++Pkg)
+   {
+      RemoveSizes(Pkg);
+      RemoveStates(Pkg);
+
+      StateCache &P = PkgState[Pkg->ID];
+      if (To == true)
+	 P.iFlags |= ReInstall;
+      else
+	 P.iFlags &= ~ReInstall;
+
+      AddStates(Pkg);
+      AddSizes(Pkg);
+   }
+}
+									/*}}}*/
+pkgCache::VerIterator pkgDepCache::GetCandidateVersion(PkgIterator const &Pkg)/*{{{*/
+{
+   return PkgState[Pkg->ID].CandidateVerIter(*this);
+}
+									/*}}}*/
+// DepCache::SetCandidateVersion - Change the candidate version		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgDepCache::SetCandidateVersion(VerIterator TargetVer)
+{
+   pkgCache::PkgIterator Pkg = TargetVer.ParentPkg();
+   StateCache &P = PkgState[Pkg->ID];
+
+   if (P.CandidateVer == TargetVer)
+      return;
+
+   ActionGroup group(*this);
+
+   RemoveSizes(Pkg);
+   RemoveStates(Pkg);
+
+   if (P.CandidateVer == P.InstallVer && P.Install() == true)
+      P.InstallVer = (Version *)TargetVer;
+   P.CandidateVer = (Version *)TargetVer;
+   P.Update(Pkg,*this);
+   
+   AddStates(Pkg);
+   Update(Pkg);
+   AddSizes(Pkg);
+
+}
+									/*}}}*/
+// DepCache::SetCandidateRelease - Change the candidate version		/*{{{*/
+// ---------------------------------------------------------------------
+/* changes the candidate of a package and walks over all its dependencies
+   to check if it needs to change the candidate of the dependency, too,
+   to reach a installable versionstate */
+bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
+					std::string const &TargetRel)
+{
+   std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
+   return SetCandidateRelease(TargetVer, TargetRel, Changed);
+}
+bool pkgDepCache::SetCandidateRelease(pkgCache::VerIterator TargetVer,
+					std::string const &TargetRel,
+					std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > &Changed)
+{
+   ActionGroup group(*this);
+   SetCandidateVersion(TargetVer);
+
+   if (TargetRel == "installed" || TargetRel == "candidate") // both doesn't make sense in this context
+      return true;
+
+   pkgVersionMatch Match(TargetRel, pkgVersionMatch::Release);
+   // save the position of the last element we will not undo - if we have to
+   std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::iterator newChanged = --(Changed.end());
+
+   for (pkgCache::DepIterator D = TargetVer.DependsList(); D.end() == false; ++D)
+   {
+      if (D->Type != pkgCache::Dep::PreDepends && D->Type != pkgCache::Dep::Depends &&
+	  ((D->Type != pkgCache::Dep::Recommends && D->Type != pkgCache::Dep::Suggests) ||
+	   IsImportantDep(D) == false))
+	 continue;
+
+      // walk over an or-group and check if we need to do anything
+      // for simpilicity no or-group is handled as a or-group including one dependency
+      pkgCache::DepIterator Start = D;
+      bool itsFine = false;
+      for (bool stillOr = true; stillOr == true; ++Start)
+      {
+	 stillOr = (Start->CompareOp & Dep::Or) == Dep::Or;
+	 pkgCache::PkgIterator const P = Start.TargetPkg();
+	 // virtual packages can't be a solution
+	 if (P.end() == true || (P->ProvidesList == 0 && P->VersionList == 0))
+	    continue;
+	 // if its already installed, check if this one is good enough
+	 pkgCache::VerIterator const Now = P.CurrentVer();
+	 if (Now.end() == false && Start.IsSatisfied(Now))
+	 {
+	    itsFine = true;
+	    break;
+	 }
+	 pkgCache::VerIterator const Cand = PkgState[P->ID].CandidateVerIter(*this);
+	 // no versioned dependency - but is it installable?
+	 if (Start.TargetVer() == 0 || Start.TargetVer()[0] == '\0')
+	 {
+	    // Check if one of the providers is installable
+	    if (P->ProvidesList != 0)
+	    {
+	       pkgCache::PrvIterator Prv = P.ProvidesList();
+	       for (; Prv.end() == false; ++Prv)
+	       {
+		  pkgCache::VerIterator const C = PkgState[Prv.OwnerPkg()->ID].CandidateVerIter(*this);
+		  if (C.end() == true || C != Prv.OwnerVer() ||
+		      (VersionState(C.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
+		     continue;
+		  break;
+	       }
+	       if (Prv.end() == true)
+		  continue;
+	    }
+	    // no providers, so check if we have an installable candidate version
+	    else if (Cand.end() == true ||
+		(VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) != DepCandMin)
+	       continue;
+	    itsFine = true;
+	    break;
+	 }
+	 if (Cand.end() == true)
+	    continue;
+	 // check if the current candidate is enough for the versioned dependency - and installable?
+	 if (Start.IsSatisfied(Cand) == true &&
+	     (VersionState(Cand.DependsList(), DepInstall, DepCandMin, DepCandPolicy) & DepCandMin) == DepCandMin)
+	 {
+	    itsFine = true;
+	    break;
+	 }
+      }
+
+      if (itsFine == true) {
+	 // something in the or-group was fine, skip all other members
+	 for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
+	 continue;
+      }
+
+      // walk again over the or-group and check each if a candidate switch would help
+      itsFine = false;
+      for (bool stillOr = true; stillOr == true; ++D)
+      {
+	 stillOr = (D->CompareOp & Dep::Or) == Dep::Or;
+	 // changing candidate will not help if the dependency is not versioned
+	 if (D.TargetVer() == 0 || D.TargetVer()[0] == '\0')
+	 {
+	    if (stillOr == true)
+	       continue;
+	    break;
+	 }
+
+	 pkgCache::VerIterator V;
+	 if (TargetRel == "newest")
+	    V = D.TargetPkg().VersionList();
+	 else
+	    V = Match.Find(D.TargetPkg());
+
+	 // check if the version from this release could satisfy the dependency
+	 if (V.end() == true || D.IsSatisfied(V) == false)
+	 {
+	    if (stillOr == true)
+	       continue;
+	    break;
+	 }
+
+	 pkgCache::VerIterator oldCand = PkgState[D.TargetPkg()->ID].CandidateVerIter(*this);
+	 if (V == oldCand)
+	 {
+	    // Do we already touched this Version? If so, their versioned dependencies are okay, no need to check again
+	    for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
+		 c != Changed.end(); ++c)
+	    {
+	       if (c->first->ParentPkg != V->ParentPkg)
+		  continue;
+	       itsFine = true;
+	       break;
+	    }
+	 }
+
+	 if (itsFine == false)
+	 {
+	    // change the candidate
+	    Changed.emplace_back(V, TargetVer);
+	    if (SetCandidateRelease(V, TargetRel, Changed) == false)
+	    {
+	       if (stillOr == false)
+		  break;
+	       // undo the candidate changing
+	       SetCandidateVersion(oldCand);
+	       Changed.pop_back();
+	       continue;
+	    }
+	    itsFine = true;
+	 }
+
+	 // something in the or-group was fine, skip all other members
+	 for (; (D->CompareOp & Dep::Or) == Dep::Or; ++D);
+	 break;
+      }
+
+      if (itsFine == false && (D->Type == pkgCache::Dep::PreDepends || D->Type == pkgCache::Dep::Depends))
+      {
+	 // undo all changes which aren't lead to a solution
+	 for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = ++newChanged;
+	      c != Changed.end(); ++c)
+	    SetCandidateVersion(c->first);
+	 Changed.erase(newChanged, Changed.end());
+	 return false;
+      }
+   }
+   return true;
+}
+									/*}}}*/
+// DepCache::MarkAuto - set the Auto flag for a package			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgDepCache::MarkAuto(const PkgIterator &Pkg, bool Auto)
+{
+  StateCache &state = PkgState[Pkg->ID];
+
+  ActionGroup group(*this);
+
+  if(Auto)
+    state.Flags |= Flag::Auto;
+  else
+    state.Flags &= ~Flag::Auto;
+}
+									/*}}}*/
+// StateCache::Update - Compute the various static display things	/*{{{*/
+// ---------------------------------------------------------------------
+/* This is called whenever the Candidate version changes. */
+void pkgDepCache::StateCache::Update(PkgIterator Pkg,pkgCache &Cache)
+{
+   // Some info
+   VerIterator Ver = CandidateVerIter(Cache);
+
+   // Use a null string or the version string
+   if (Ver.end() == true)
+      CandVersion = "";
+   else
+      CandVersion = Ver.VerStr();
+
+   // Find the current version
+   if (Pkg->CurrentVer != 0)
+      CurVersion = Pkg.CurrentVer().VerStr();
+   else
+      CurVersion = "";
+
+   // Figure out if its up or down or equal
+   if (Pkg->CurrentVer == 0 || Pkg->VersionList == 0 || CandidateVer == 0)
+      Status = 2;
+   else
+      Status = Ver.CompareVer(Pkg.CurrentVer());
+}
+									/*}}}*/
+// Policy::GetCandidateVer - Returns the Candidate install version	/*{{{*/
+// ---------------------------------------------------------------------
+/* The default just returns the highest available version that is not
+   a source and automatic. */
+pkgCache::VerIterator pkgDepCache::Policy::GetCandidateVer(PkgIterator const &Pkg)
+{
+   /* Not source/not automatic versions cannot be a candidate version 
+      unless they are already installed */
+   VerIterator Last;
+   
+   for (VerIterator I = Pkg.VersionList(); I.end() == false; ++I)
+   {
+      if (Pkg.CurrentVer() == I)
+	 return I;
+      
+      for (VerFileIterator J = I.FileList(); J.end() == false; ++J)
+      {
+	 if (J.File().Flagged(Flag::NotSource))
+	    continue;
+
+	 /* Stash the highest version of a not-automatic source, we use it
+	    if there is nothing better */
+	 if (J.File().Flagged(Flag::NotAutomatic) ||
+	     J.File().Flagged(Flag::ButAutomaticUpgrades))
+	 {
+	    if (Last.end() == true)
+	       Last = I;
+	    continue;
+	 }
+
+	 return I;
+      }
+   }
+   
+   return Last;
+}
+									/*}}}*/
+// Policy::IsImportantDep - True if the dependency is important		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgDepCache::Policy::IsImportantDep(DepIterator const &Dep) const
+{
+   if(Dep.IsCritical())
+      return true;
+   else if(Dep->Type == pkgCache::Dep::Recommends)
+   {
+      if (InstallRecommends)
+	 return true;
+      // we support a special mode to only install-recommends for certain
+      // sections
+      // FIXME: this is a meant as a temporary solution until the
+      //        recommends are cleaned up
+      const char *sec = Dep.ParentVer().Section();
+      if (sec && SectionInSubTree("APT::Install-Recommends-Sections", sec))
+	 return true;
+   }
+   else if(Dep->Type == pkgCache::Dep::Suggests)
+      return InstallSuggests;
+
+   return false;
+}
+									/*}}}*/
+// Policy::GetPriority - Get the priority of the package pin		/*{{{*/
+APT_PURE signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgIterator const &/*Pkg*/)
+{ return 0; }
+APT_PURE signed short pkgDepCache::Policy::GetPriority(pkgCache::VerIterator const &/*Ver*/, bool /*ConsiderFiles*/)
+{ return 0; }
+APT_PURE signed short pkgDepCache::Policy::GetPriority(pkgCache::PkgFileIterator const &/*File*/)
+{ return 0; }
+									/*}}}*/
+pkgDepCache::InRootSetFunc *pkgDepCache::GetRootSetFunc()		/*{{{*/
+{
+   DefaultRootSetFunc *f = new DefaultRootSetFunc2(&GetCache());
+   if (f->wasConstructedSuccessfully())
+      return f;
+   else
+   {
+      delete f;
+      return NULL;
+   }
+}
+
+pkgDepCache::InRootSetFunc *pkgDepCache::GetCachedRootSetFunc()
+{
+   if (d->inRootSetFunc == nullptr)
+      d->inRootSetFunc.reset(GetRootSetFunc());
+   return d->inRootSetFunc.get();
+}
+									/*}}}*/
+bool pkgDepCache::MarkFollowsRecommends()				/*{{{*/
+{
+  return _config->FindB("APT::AutoRemove::RecommendsImportant", true);
+}
+									/*}}}*/
+bool pkgDepCache::MarkFollowsSuggests()					/*{{{*/
+{
+  return _config->FindB("APT::AutoRemove::SuggestsImportant", true);
+}
+									/*}}}*/
+static bool IsPkgInBoringState(pkgCache::PkgIterator const &Pkg, pkgDepCache::StateCache const * const PkgState)/*{{{*/
+{
+   if (Pkg->CurrentVer == 0)
+   {
+      if (PkgState[Pkg->ID].Keep())
+	 return true;
+   }
+   else
+   {
+      if (PkgState[Pkg->ID].Delete())
+	 return true;
+   }
+   return false;
+}
+									/*}}}*/
+// MarkPackage - mark a single package in Mark-and-Sweep		/*{{{*/
+static bool MarkPackage(pkgCache::PkgIterator const &Pkg,
+			pkgCache::VerIterator const &Ver,
+			bool const follow_recommends,
+			bool const follow_suggests,
+			bool const debug_autoremove,
+			std::string_view const reason,
+			size_t const Depth,
+			pkgCache &Cache,
+			pkgDepCache &DepCache,
+			pkgDepCache::StateCache *const PkgState,
+			std::vector<bool> &fullyExplored,
+			std::unique_ptr<APT::CacheFilter::Matcher> &IsAVersionedKernelPackage,
+			std::unique_ptr<APT::CacheFilter::Matcher> &IsProtectedKernelPackage)
+{
+   if (Ver.end() || PkgState[Pkg->ID].Marked)
+      return true;
+
+   if (IsPkgInBoringState(Pkg, PkgState))
+   {
+      fullyExplored[Pkg->ID] = true;
+      return true;
+   }
+
+   // we are not trying too hard…
+   if (unlikely(Depth > 3000))
+      return false;
+
+   PkgState[Pkg->ID].Marked = true;
+   if(debug_autoremove)
+      std::clog << "Marking: " << Pkg.FullName() << " " << Ver.VerStr()
+		<< " (" << reason << ")" << std::endl;
+
+   auto const sort_by_source_version = [](pkgCache::VerIterator const &A, pkgCache::VerIterator const &B) {
+      auto const verret = A.Cache()->VS->CmpVersion(A.SourceVerStr(), B.SourceVerStr());
+      if (verret != 0)
+	 return verret < 0;
+      return A->ID < B->ID;
+   };
+
+   for (auto D = Ver.DependsList(); not D.end(); ++D)
+   {
+      auto const T = D.TargetPkg();
+      if (T.end() || fullyExplored[T->ID])
+	 continue;
+
+      if (D->Type != pkgCache::Dep::Depends &&
+	    D->Type != pkgCache::Dep::PreDepends &&
+	    (not follow_recommends || D->Type != pkgCache::Dep::Recommends) &&
+	    (not follow_suggests || D->Type != pkgCache::Dep::Suggests))
+	 continue;
+
+      bool unsatisfied_choice = false;
+      std::unordered_map<std::string, APT::VersionVector> providers_by_source;
+      // collect real part
+      if (not IsPkgInBoringState(T, PkgState))
+      {
+	 auto const TV = (PkgState[T->ID].Install()) ? PkgState[T->ID].InstVerIter(DepCache) : T.CurrentVer();
+	 if (likely(not TV.end()))
+	 {
+	    if (not D.IsSatisfied(TV))
+	       unsatisfied_choice = true;
+	    else
+	       providers_by_source[TV.SourcePkgName()].push_back(TV);
+	 }
+      }
+      if (providers_by_source.empty() && not unsatisfied_choice)
+	 PkgState[T->ID].Marked = true;
+      // collect virtual part
+      for (auto Prv = T.ProvidesList(); not Prv.end(); ++Prv)
+      {
+	 auto const PP = Prv.OwnerPkg();
+	 if (IsPkgInBoringState(PP, PkgState))
+	    continue;
+
+	 // we want to ignore provides from uninteresting versions
+	 auto const PV = (PkgState[PP->ID].Install()) ?
+	    PkgState[PP->ID].InstVerIter(DepCache) : PP.CurrentVer();
+	 if (unlikely(PV.end()) || PV != Prv.OwnerVer())
+	    continue;
+
+	 if (not D.IsSatisfied(Prv))
+	    unsatisfied_choice = true;
+	 else
+	    providers_by_source[PV.SourcePkgName()].push_back(PV);
+      }
+      // only latest binary package of a source package is marked instead of all
+      for (auto &providers : providers_by_source)
+      {
+	 auto const highestSrcVer = (*std::max_element(providers.second.begin(), providers.second.end(), sort_by_source_version)).SourceVerStr();
+	 providers.second.erase(std::remove_if(providers.second.begin(), providers.second.end(), [&](auto const &V) { return strcmp(highestSrcVer, V.SourceVerStr()) != 0; }), providers.second.end());
+	 // if the provider is a versioned kernel package mark them only for protected kernels
+	 if (providers.second.size() == 1)
+	    continue;
+	 if (not IsAVersionedKernelPackage)
+	    IsAVersionedKernelPackage = [&]() -> std::unique_ptr<APT::CacheFilter::Matcher> {
+	       auto const patterns = _config->FindVector("APT::VersionedKernelPackages");
+	       if (patterns.empty())
+		  return std::make_unique<APT::CacheFilter::FalseMatcher>();
+	       std::ostringstream regex;
+	       regex << '^';
+	       std::copy(patterns.begin(), patterns.end() - 1, std::ostream_iterator<std::string>(regex, "-.*$|^"));
+	       regex << patterns.back() << "-.*$";
+	       return std::make_unique<APT::CacheFilter::PackageNameMatchesRegEx>(regex.str());
+	    }();
+	 if (not std::all_of(providers.second.begin(), providers.second.end(), [&](auto const &Prv) { return (*IsAVersionedKernelPackage)(Prv.ParentPkg()); }))
+	    continue;
+	 // … if there is at least one for protected kernels installed
+	 if (not IsProtectedKernelPackage)
+	    IsProtectedKernelPackage = APT::KernelAutoRemoveHelper::GetProtectedKernelsFilter(&Cache);
+	 if (not std::any_of(providers.second.begin(), providers.second.end(), [&](auto const &Prv) { return (*IsProtectedKernelPackage)(Prv.ParentPkg()); }))
+	    continue;
+	 providers.second.erase(std::remove_if(providers.second.begin(), providers.second.end(),
+					       [&](auto const &Prv) { return not((*IsProtectedKernelPackage)(Prv.ParentPkg())); }),
+				providers.second.end());
+      }
+
+      if (not unsatisfied_choice)
+	 fullyExplored[T->ID] = true;
+      for (auto const &providers : providers_by_source)
+      {
+	 for (auto const &PV : providers.second)
+	 {
+	    auto const PP = PV.ParentPkg();
+	    if (debug_autoremove)
+	       std::clog << "Following dep: " << APT::PrettyDep(&DepCache, D)
+			 << ", provided by " << PP.FullName() << " " << PV.VerStr()
+			 << " (" << providers_by_source.size() << "/" << providers.second.size() << ")\n";
+	    if (not MarkPackage(PP, PV, follow_recommends, follow_suggests, debug_autoremove,
+				"Dependency", Depth + 1, Cache, DepCache, PkgState, fullyExplored,
+				IsAVersionedKernelPackage, IsProtectedKernelPackage))
+	       return false;
+	 }
+      }
+   }
+   return true;
+}
+									/*}}}*/
+// pkgDepCache::MarkRequired - the main mark algorithm			/*{{{*/
+bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
+{
+   if (_config->Find("APT::Solver", "internal") != "internal")
+      return true;
+
+   // init the states
+   auto const PackagesCount = Head().PackageCount;
+   for(auto i = decltype(PackagesCount){0}; i < PackagesCount; ++i)
+   {
+      PkgState[i].Marked  = false;
+      PkgState[i].Garbage = false;
+   }
+   std::vector<bool> fullyExplored(PackagesCount, false);
+
+   bool const debug_autoremove = _config->FindB("Debug::pkgAutoRemove", false);
+   if (debug_autoremove)
+      for(PkgIterator p = PkgBegin(); !p.end(); ++p)
+	 if(PkgState[p->ID].Flags & Flag::Auto)
+	    std::clog << "AutoDep: " << p.FullName() << std::endl;
+
+   bool const follow_recommends = MarkFollowsRecommends();
+   bool const follow_suggests   = MarkFollowsSuggests();
+
+   // do the mark part, this is the core bit of the algorithm
+   for (PkgIterator P = PkgBegin(); !P.end(); ++P)
+   {
+      if (PkgState[P->ID].Marked || IsPkgInBoringState(P, PkgState))
+	 continue;
+
+      std::string_view reason;
+      if ((PkgState[P->ID].Flags & Flag::Auto) == 0)
+	 reason = "Manual-Installed";
+      else if (P->Flags & Flag::Essential)
+	 reason = "Essential";
+      else if (P->Flags & Flag::Important)
+	 reason = "Important";
+      else if (P->CurrentVer != 0 && P.CurrentVer()->Priority == pkgCache::State::Required)
+	 reason = "Required";
+      else if (userFunc.InRootSet(P))
+	 reason = "Blacklisted [APT::NeverAutoRemove]";
+      else if (not IsModeChangeOk(*this, ModeGarbage, P, 0, false, DebugMarker))
+	 reason = "Hold";
+      else
+	 continue;
+
+      pkgCache::VerIterator const PV = (PkgState[P->ID].Install()) ? PkgState[P->ID].InstVerIter(*this) : P.CurrentVer();
+      if (not MarkPackage(P, PV, follow_recommends, follow_suggests, debug_autoremove,
+			  reason, 0, *Cache, *this, PkgState, fullyExplored,
+			  d->IsAVersionedKernelPackage, d->IsProtectedKernelPackage))
+	 return false;
+   }
+   return true;
+}
+									/*}}}*/
+bool pkgDepCache::Sweep()						/*{{{*/
+{
+   bool debug_autoremove = _config->FindB("Debug::pkgAutoRemove",false);
+
+   // do the sweep
+   for(PkgIterator p=PkgBegin(); !p.end(); ++p)
+   {
+     StateCache &state=PkgState[p->ID];
+
+     // skip required packages
+     if (!p.CurrentVer().end() && 
+	 (p.CurrentVer()->Priority == pkgCache::State::Required))
+	continue;
+
+     // if it is not marked and it is installed, it's garbage 
+     if(!state.Marked && (!p.CurrentVer().end() || state.Install()))
+     {
+	state.Garbage=true;
+	if(debug_autoremove)
+	   std::clog << "Garbage: " << p.FullName() << std::endl;
+     }
+  }   
+
+   return true;
+}
+									/*}}}*/
+// DepCache::MarkAndSweep						/*{{{*/
+bool pkgDepCache::MarkAndSweep(InRootSetFunc &rootFunc)
+{
+   return MarkRequired(rootFunc) && Sweep();
+}
+bool pkgDepCache::MarkAndSweep()
+{
+   InRootSetFunc *f(GetCachedRootSetFunc());
+   if (f != NULL)
+      return MarkAndSweep(*f);
+   else
+      return false;
+}
+									/*}}}*/