]> git.saurik.com Git - apt.git/blobdiff - apt-pkg/edsp.cc
do not restore selections for already purged packages
[apt.git] / apt-pkg / edsp.cc
index f8925072e9bd7d06c30e8b2e15dd54d390d52a1a..f56625feb5e9044e04ac5a07fd41bf38d5798731 100644 (file)
@@ -7,18 +7,23 @@
 // Include Files                                                       /*{{{*/
 #include <config.h>
 
+#include <apt-pkg/algorithms.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/cacheset.h>
 #include <apt-pkg/depcache.h>
 #include <apt-pkg/pkgcache.h>
 #include <apt-pkg/cacheiterators.h>
+#include <apt-pkg/prettyprinters.h>
+#include <apt-pkg/packagemanager.h>
 #include <apt-pkg/progress.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/edsp.h>
 #include <apt-pkg/tagfile.h>
 #include <apt-pkg/strutl.h>
+#include <apt-pkg/string_view.h>
 #include <apt-pkg/pkgsystem.h>
 
+#include <sys/stat.h>
 #include <ctype.h>
 #include <stddef.h>
 #include <string.h>
@@ -335,7 +340,7 @@ static bool WriteScenarioLimitedDependency(FileFd &output,
 static bool SkipUnavailableVersions(pkgDepCache &Cache, pkgCache::PkgIterator const &Pkg, pkgCache::VerIterator const &Ver)/*{{{*/
 {
    /* versions which aren't current and aren't available in
-      any "online" source file are bad, expect if they are the choosen
+      any "online" source file are bad, expect if they are the chosen
       candidate: The exception is for build-dep implementation as it creates
       such pseudo (package) versions and removes them later on again.
       We filter out versions at all so packages in 'rc' state only available
@@ -435,7 +440,7 @@ bool EDSP::WriteScenario(pkgDepCache &Cache, FileFd &output, OpProgress *Progres
            Progress->Progress(p);
       }
    }
-   return true;
+   return Okay;
 }
                                                                        /*}}}*/
 // EDSP::WriteLimitedScenario - to the given file descriptor           /*{{{*/
@@ -596,10 +601,12 @@ bool EDSP::WriteRequest(pkgDepCache &Cache, FileFd &output,
       WriteOkay(Okay, output, "Forbid-New-Install: yes\n");
    if (flags & Request::FORBID_REMOVE)
       WriteOkay(Okay, output, "Forbid-Remove: yes\n");
+   auto const solver = _config->Find("APT::Solver", "internal");
+   WriteOkay(Okay, output, "Solver: ", solver, "\n");
    if (_config->FindB("APT::Solver::Strict-Pinning", true) == false)
       WriteOkay(Okay, output, "Strict-Pinning: no\n");
    string solverpref("APT::Solver::");
-   solverpref.append(_config->Find("APT::Solver", "internal")).append("::Preferences");
+   solverpref.append(solver).append("::Preferences");
    if (_config->Exists(solverpref) == true)
       WriteOkay(Okay, output, "Preferences: ", _config->Find(solverpref,""), "\n");
    return WriteOkay(Okay, output, "\n");
@@ -621,7 +628,7 @@ bool EDSP::ReadResponse(int const input, pkgDepCache &Cache, OpProgress *Progres
        }
 
        FileFd in;
-       in.OpenDescriptor(input, FileFd::ReadOnly);
+       in.OpenDescriptor(input, FileFd::ReadOnly, true);
        pkgTagFile response(&in, 100);
        pkgTagSection section;
 
@@ -655,8 +662,12 @@ bool EDSP::ReadResponse(int const input, pkgDepCache &Cache, OpProgress *Progres
                        return false;
                } else if (section.Exists("Autoremove") == true)
                        type = "Autoremove";
-               else
+               else {
+                       char const *Start, *End;
+                       section.GetSection(Start, End);
+                       _error->Warning("Encountered an unexpected section with %d fields: %s", section.Count(), std::string(Start, End).c_str());
                        continue;
+               }
 
                size_t const id = section.FindULL(type.c_str(), VersionCount);
                if (id == VersionCount) {
@@ -724,24 +735,31 @@ static bool ReadLine(int const input, std::string &line) {
 // StringToBool - convert yes/no to bool                               /*{{{*/
 // ---------------------------------------------------------------------
 /* we are not as lazy as we are in the global StringToBool as we really
-   only accept yes/no here - but we will ignore leading spaces */
-static bool StringToBool(char const *answer, bool const defValue) {
-   for (; isspace(*answer) != 0; ++answer);
-   if (strncasecmp(answer, "yes", 3) == 0)
+   only accept yes/no here */
+static bool localStringToBool(std::string answer, bool const defValue) {
+   std::transform(answer.begin(), answer.end(), answer.begin(), ::tolower);
+   if (answer == "yes")
       return true;
-   else if (strncasecmp(answer, "no", 2) == 0)
+   else if (answer == "no")
       return false;
    else
-      _error->Warning("Value '%s' is not a boolean 'yes' or 'no'!", answer);
+      _error->Warning("Value '%s' is not a boolean 'yes' or 'no'!", answer.c_str());
    return defValue;
 }
                                                                        /*}}}*/
-static bool ReadFlag(unsigned int &flags, std::string const &line, APT::StringView const name, unsigned int const setflag)/*{{{*/
+static bool LineStartsWithAndStrip(std::string &line, APT::StringView const with)/*{{{*/
+{
+   if (line.compare(0, with.size(), with.data()) != 0)
+      return false;
+   line = APT::String::Strip(line.substr(with.length()));
+   return true;
+}
+                                                                       /*}}}*/
+static bool ReadFlag(unsigned int &flags, std::string &line, APT::StringView const name, unsigned int const setflag)/*{{{*/
 {
-   if (line.compare(0, name.length(), name.data()) != 0)
+   if (LineStartsWithAndStrip(line, name) == false)
       return false;
-   auto const l = line.c_str() + name.length() + 1;
-   if (StringToBool(l, false))
+   if (localStringToBool(line, false))
       flags |= setflag;
    else
       flags &= ~setflag;
@@ -762,7 +780,7 @@ bool EDSP::ReadRequest(int const input, std::list<std::string> &install,
       if (line.empty() == true)
         continue;
       // The first Tag must be a request, so search for it
-      if (line.compare(0, 8, "Request:") != 0)
+      if (LineStartsWithAndStrip(line, "Request:"))
         continue;
 
       while (ReadLine(input, line) == true)
@@ -772,16 +790,10 @@ bool EDSP::ReadRequest(int const input, std::list<std::string> &install,
            return true;
 
         std::list<std::string> *request = NULL;
-        if (line.compare(0, 8, "Install:") == 0)
-        {
-           line.erase(0, 8);
+        if (LineStartsWithAndStrip(line, "Install:"))
            request = &install;
-        }
-        else if (line.compare(0, 7, "Remove:") == 0)
-        {
-           line.erase(0, 7);
+        else if (LineStartsWithAndStrip(line, "Remove:"))
            request = &remove;
-        }
         else if (ReadFlag(flags, line, "Upgrade:", (Request::UPGRADE_ALL | Request::FORBID_REMOVE | Request::FORBID_NEW_INSTALL)) ||
               ReadFlag(flags, line, "Dist-Upgrade:", Request::UPGRADE_ALL) ||
               ReadFlag(flags, line, "Upgrade-All:", Request::UPGRADE_ALL) ||
@@ -789,33 +801,19 @@ bool EDSP::ReadRequest(int const input, std::list<std::string> &install,
               ReadFlag(flags, line, "Forbid-Remove:", Request::FORBID_REMOVE) ||
               ReadFlag(flags, line, "Autoremove:", Request::AUTOREMOVE))
            ;
-        else if (line.compare(0, 13, "Architecture:") == 0)
-           _config->Set("APT::Architecture", line.c_str() + 14);
-        else if (line.compare(0, 14, "Architectures:") == 0)
-        {
-           std::string const archs = line.c_str() + 15;
-           _config->Set("APT::Architectures", SubstVar(archs, " ", ","));
-        }
-        else if (line.compare(0, 7, "Solver:") == 0)
+        else if (LineStartsWithAndStrip(line, "Architecture:"))
+           _config->Set("APT::Architecture", line);
+        else if (LineStartsWithAndStrip(line, "Architectures:"))
+           _config->Set("APT::Architectures", SubstVar(line, " ", ","));
+        else if (LineStartsWithAndStrip(line, "Solver:"))
            ; // purely informational line
         else
            _error->Warning("Unknown line in EDSP Request stanza: %s", line.c_str());
 
         if (request == NULL)
            continue;
-        size_t end = line.length();
-        do {
-           size_t begin = line.rfind(' ');
-           if (begin == std::string::npos)
-           {
-              request->push_back(line.substr(0, end));
-              break;
-           }
-           else if (begin < end)
-              request->push_back(line.substr(begin + 1, end));
-           line.erase(begin);
-           end = line.find_last_not_of(' ');
-        } while (end != std::string::npos);
+        auto const pkgs = VectorizeString(line, ' ');
+        std::move(pkgs.begin(), pkgs.end(), std::back_inserter(*request));
       }
    }
    return false;
@@ -871,7 +869,7 @@ bool EDSP::ApplyRequest(std::list<std::string> const &install,
        return true;
 }
                                                                        /*}}}*/
-// EDSP::WriteSolution - to the given file descriptor                  /*{{{*/
+// EDSP::WriteSolutionStanza - to the given file descriptor            /*{{{*/
 bool EDSP::WriteSolution(pkgDepCache &Cache, FILE* output)
 {
    bool const Debug = _config->FindB("Debug::EDSP::WriteSolution", false);
@@ -903,46 +901,25 @@ bool EDSP::WriteSolution(pkgDepCache &Cache, FILE* output)
 
    return true;
 }
-bool EDSP::WriteSolution(pkgDepCache &Cache, FileFd &output)
+bool EDSP::WriteSolutionStanza(FileFd &output, char const * const Type, pkgCache::VerIterator const &Ver)
 {
-   bool const Debug = _config->FindB("Debug::EDSP::WriteSolution", false);
    bool Okay = output.Failed() == false;
-   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false && likely(Okay); ++Pkg)
-   {
-      std::string action;
-      if (Cache[Pkg].Delete() == true)
-        WriteOkay(Okay, output, "Remove: ", _system->GetVersionMapping(Pkg.CurrentVer()->ID), "\n");
-      else if (Cache[Pkg].NewInstall() == true || Cache[Pkg].Upgrade() == true)
-        WriteOkay(Okay, output, "Install: ", _system->GetVersionMapping(Cache.GetCandidateVersion(Pkg)->ID), "\n");
-      else if (Cache[Pkg].Garbage == true)
-        WriteOkay(Okay, output, "Autoremove: ", _system->GetVersionMapping(Pkg.CurrentVer()->ID), "\n");
-      else
-        continue;
-
-      if (Debug)
-      {
-        WriteOkay(Okay, output, "Package: ", Pkg.FullName(), "\nVersion: ");
-        if (Cache[Pkg].Delete() == true || Cache[Pkg].Garbage == true)
-           WriteOkay(Okay, output, Pkg.CurrentVer().VerStr(), "\n\n");
-        else
-           WriteOkay(Okay, output, Cache.GetCandidateVersion(Pkg).VerStr(), "\n\n");
-      }
-      else
-        WriteOkay(Okay, output, "\n");
-   }
-   return Okay;
+   WriteOkay(Okay, output, Type, ": ", _system->GetVersionMapping(Ver->ID));
+   if (_config->FindB("Debug::EDSP::WriteSolution", false) == true)
+      WriteOkay(Okay, output, "\nPackage: ", Ver.ParentPkg().FullName(), "\nVersion: ", Ver.VerStr());
+   return WriteOkay(Okay, output, "\n\n");
 }
                                                                        /*}}}*/
 // EDSP::WriteProgess - pulse to the given file descriptor             /*{{{*/
 bool EDSP::WriteProgress(unsigned short const percent, const char* const message, FILE* output) {
-       fprintf(output, "Progress: %s\n", TimeRFC1123(time(NULL)).c_str());
+       fprintf(output, "Progress: %s\n", TimeRFC1123(time(NULL), true).c_str());
        fprintf(output, "Percentage: %d\n", percent);
        fprintf(output, "Message: %s\n\n", message);
        fflush(output);
        return true;
 }
 bool EDSP::WriteProgress(unsigned short const percent, const char* const message, FileFd &output) {
-       return WriteOkay(output, "Progress: ", TimeRFC1123(time(NULL)), "\n",
+       return WriteOkay(output, "Progress: ", TimeRFC1123(time(NULL), true), "\n",
              "Percentage: ", percent, "\n",
              "Message: ", message, "\n\n") && output.Flush();
 }
@@ -959,15 +936,23 @@ bool EDSP::WriteError(char const * const uuid, std::string const &message, FileF
              "\n\n");
 }
                                                                        /*}}}*/
+static std::string findExecutable(std::vector<std::string> const &dirs, char const * const binary) {/*{{{*/
+       for (auto && dir : dirs) {
+               std::string const file = flCombine(dir, binary);
+               if (RealFileExists(file) == true)
+                       return file;
+       }
+       return "";
+}
+                                                                       /*}}}*/
 static pid_t ExecuteExternal(char const* const type, char const * const binary, char const * const configdir, int * const solver_in, int * const solver_out) {/*{{{*/
-       std::vector<std::string> const solverDirs = _config->FindVector(configdir);
-       std::string file;
-       for (std::vector<std::string>::const_iterator dir = solverDirs.begin();
-            dir != solverDirs.end(); ++dir) {
-               file = flCombine(*dir, binary);
-               if (RealFileExists(file.c_str()) == true)
-                       break;
-               file.clear();
+       auto const solverDirs = _config->FindVector(configdir);
+       auto const file = findExecutable(solverDirs, binary);
+       std::string dumper;
+       {
+               dumper = findExecutable(solverDirs, "apt-dump-solver");
+               if (dumper.empty())
+                       dumper = findExecutable(solverDirs, "dump");
        }
 
        if (file.empty() == true)
@@ -988,8 +973,23 @@ static pid_t ExecuteExternal(char const* const type, char const * const binary,
        if (Solver == 0) {
                dup2(external[0], STDIN_FILENO);
                dup2(external[3], STDOUT_FILENO);
-               const char* calling[2] = { file.c_str(), 0 };
-               execv(calling[0], (char**) calling);
+               auto const dumpfile = _config->FindFile((std::string("Dir::Log::") + type).c_str());
+               auto const dumpdir = flNotFile(dumpfile);
+               auto const runasuser = _config->Find(std::string("APT::") + type + "::" + binary + "::RunAsUser",
+                     _config->Find(std::string("APT::") + type + "::RunAsUser",
+                        _config->Find("APT::Sandbox::User")));
+               if (dumper.empty() || dumpfile.empty() || dumper == file || CreateAPTDirectoryIfNeeded(dumpdir, dumpdir) == false)
+               {
+                  _config->Set("APT::Sandbox::User", runasuser);
+                  DropPrivileges();
+                  char const * const calling[] = { file.c_str(), nullptr };
+                  execv(calling[0], const_cast<char**>(calling));
+               }
+               else
+               {
+                  char const * const calling[] = { dumper.c_str(), "--user", runasuser.c_str(), dumpfile.c_str(), file.c_str(), nullptr };
+                  execv(calling[0], const_cast<char**>(calling));
+               }
                std::cerr << "Failed to execute " << type << " '" << binary << "'!" << std::endl;
                _exit(100);
        }
@@ -1017,9 +1017,40 @@ bool EDSP::ExecuteSolver(const char* const solver, int *solver_in, int *solver_o
    return true;
 }
                                                                        /*}}}*/
+static bool CreateDumpFile(char const * const id, char const * const type, FileFd &output)/*{{{*/
+{
+       auto const dumpfile = _config->FindFile((std::string("Dir::Log::") + type).c_str());
+       if (dumpfile.empty())
+               return false;
+       auto const dumpdir = flNotFile(dumpfile);
+       _error->PushToStack();
+       bool errored_out = CreateAPTDirectoryIfNeeded(dumpdir, dumpdir) == false ||
+          output.Open(dumpfile, FileFd::WriteOnly | FileFd::Exclusive | FileFd::Create, FileFd::Extension, 0644) == false;
+       std::vector<std::string> downgrademsgs;
+       while (_error->empty() == false)
+       {
+               std::string msg;
+               _error->PopMessage(msg);
+               downgrademsgs.emplace_back(std::move(msg));
+       }
+       _error->RevertToStack();
+       for (auto && msg : downgrademsgs)
+          _error->Warning("%s", msg.c_str());
+       if (errored_out)
+               return _error->WarningE(id, _("Could not open file '%s'"), dumpfile.c_str());
+       return true;
+}
+                                                                       /*}}}*/
 // EDSP::ResolveExternal - resolve problems by asking external for help        {{{*/
 bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
                         unsigned int const flags, OpProgress *Progress) {
+       if (strcmp(solver, "internal") == 0)
+       {
+               FileFd output;
+               bool Okay = CreateDumpFile("EDSP::Resolve", "solver", output);
+               Okay &= EDSP::WriteRequest(Cache, output, flags, nullptr);
+               return Okay && EDSP::WriteScenario(Cache, output, nullptr);
+       }
        int solver_in, solver_out;
        pid_t const solver_pid = EDSP::ExecuteSolver(solver, &solver_in, &solver_out, true);
        if (solver_pid == 0)
@@ -1030,20 +1061,21 @@ bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
                return _error->Errno("ResolveExternal", "Opening solver %s stdin on fd %d for writing failed", solver, solver_in);
 
        bool Okay = output.Failed() == false;
-       if (Progress != NULL)
+       if (Okay && Progress != NULL)
                Progress->OverallProgress(0, 100, 5, _("Execute external solver"));
        Okay &= EDSP::WriteRequest(Cache, output, flags, Progress);
-       if (Progress != NULL)
+       if (Okay && Progress != NULL)
                Progress->OverallProgress(5, 100, 20, _("Execute external solver"));
        Okay &= EDSP::WriteScenario(Cache, output, Progress);
        output.Close();
 
-       if (Progress != NULL)
+       if (Okay && Progress != NULL)
                Progress->OverallProgress(25, 100, 75, _("Execute external solver"));
        if (Okay && EDSP::ReadResponse(solver_out, Cache, Progress) == false)
                return false;
 
-       return ExecWait(solver_pid, solver);
+       bool const waited = ExecWait(solver_pid, solver);
+       return Okay && waited;
 }
 bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
                         bool const upgrade, bool const distUpgrade,
@@ -1058,3 +1090,401 @@ bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
    return ResolveExternal(solver, Cache, flags, Progress);
 }
                                                                        /*}}}*/
+
+bool EIPP::OrderInstall(char const * const solver, pkgPackageManager * const PM,       /*{{{*/
+                        unsigned int const flags, OpProgress * const Progress)
+{
+   if (strcmp(solver, "internal") == 0)
+   {
+      FileFd output;
+      _error->PushToStack();
+      bool Okay = CreateDumpFile("EIPP::OrderInstall", "planner", output);
+      if (Okay == false && dynamic_cast<pkgSimulate*>(PM) != nullptr)
+      {
+        _error->RevertToStack();
+        return false;
+      }
+      _error->MergeWithStack();
+      Okay &= EIPP::WriteRequest(PM->Cache, output, flags, nullptr);
+      return Okay && EIPP::WriteScenario(PM->Cache, output, nullptr);
+   }
+
+   int solver_in, solver_out;
+   pid_t const solver_pid = ExecuteExternal("planner", solver, "Dir::Bin::Planners", &solver_in, &solver_out);
+   if (solver_pid == 0)
+      return false;
+
+   FileFd output;
+   if (output.OpenDescriptor(solver_in, FileFd::WriteOnly | FileFd::BufferedWrite, true) == false)
+      return _error->Errno("EIPP::OrderInstall", "Opening planner %s stdin on fd %d for writing failed", solver, solver_in);
+
+   bool Okay = output.Failed() == false;
+   if (Okay && Progress != NULL)
+      Progress->OverallProgress(0, 100, 5, _("Execute external planner"));
+   Okay &= EIPP::WriteRequest(PM->Cache, output, flags, Progress);
+   if (Okay && Progress != NULL)
+      Progress->OverallProgress(5, 100, 20, _("Execute external planner"));
+   Okay &= EIPP::WriteScenario(PM->Cache, output, Progress);
+   output.Close();
+
+   if (Okay)
+   {
+      if (Progress != nullptr)
+        Progress->OverallProgress(25, 100, 75, _("Execute external planner"));
+
+      // we don't tell the external planners about boring things
+      for (auto Pkg = PM->Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
+      {
+        if (Pkg->CurrentState == pkgCache::State::ConfigFiles && PM->Cache[Pkg].Purge() == true)
+           PM->Remove(Pkg, true);
+      }
+   }
+
+   if (EIPP::ReadResponse(solver_out, PM, Progress) == false)
+      return false;
+
+   bool const waited = ExecWait(solver_pid, solver);
+   return Okay && waited;
+}
+                                                                       /*}}}*/
+bool EIPP::WriteRequest(pkgDepCache &Cache, FileFd &output,            /*{{{*/
+                       unsigned int const flags,
+                       OpProgress * const Progress)
+{
+   if (Progress != NULL)
+      Progress->SubProgress(Cache.Head().PackageCount, _("Send request to planner"));
+   unsigned long p = 0;
+   string del, inst, reinst;
+   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg, ++p)
+   {
+      if (Progress != NULL && p % 100 == 0)
+         Progress->Progress(p);
+      string* req;
+      pkgDepCache::StateCache &P = Cache[Pkg];
+      if (P.Purge() == true && Pkg->CurrentState == pkgCache::State::ConfigFiles)
+        continue;
+      if (P.Delete() == true)
+        req = &del;
+      else if (P.NewInstall() == true || P.Upgrade() == true || P.Downgrade() == true)
+        req = &inst;
+      else if (P.ReInstall() == true)
+        req = &reinst;
+      else
+        continue;
+      req->append(" ").append(Pkg.FullName());
+   }
+   bool Okay = WriteOkay(output, "Request: EIPP 0.1\n");
+
+   const char *arch = _config->Find("APT::Architecture").c_str();
+   std::vector<string> archs = APT::Configuration::getArchitectures();
+   WriteOkay(Okay, output, "Architecture: ", arch, "\n",
+        "Architectures:");
+   for (std::vector<string>::const_iterator a = archs.begin(); a != archs.end(); ++a)
+       WriteOkay(Okay, output, " ", *a);
+   WriteOkay(Okay, output, "\n");
+
+   if (del.empty() == false)
+      WriteOkay(Okay, output, "Remove:", del, "\n");
+   if (inst.empty() == false)
+      WriteOkay(Okay, output, "Install:", inst, "\n");
+   if (reinst.empty() == false)
+      WriteOkay(Okay, output, "ReInstall:", reinst, "\n");
+   WriteOkay(Okay, output, "Planner: ", _config->Find("APT::Planner", "internal"), "\n");
+   if ((flags & Request::IMMEDIATE_CONFIGURATION_ALL) != 0)
+      WriteOkay(Okay, output, "Immediate-Configuration: yes\n");
+   else if ((flags & Request::NO_IMMEDIATE_CONFIGURATION) != 0)
+      WriteOkay(Okay, output, "Immediate-Configuration: no\n");
+   else if ((flags & Request::ALLOW_TEMPORARY_REMOVE_OF_ESSENTIALS) != 0)
+      WriteOkay(Okay, output, "Allow-Temporary-Remove-of-Essentials: yes\n");
+   return WriteOkay(Okay, output, "\n");
+}
+                                                                       /*}}}*/
+static bool WriteScenarioEIPPVersion(pkgDepCache &, FileFd &output, pkgCache::PkgIterator const &Pkg,/*{{{*/
+                               pkgCache::VerIterator const &Ver)
+{
+   bool Okay = true;
+   if (Pkg.CurrentVer() == Ver)
+      switch (Pkg->CurrentState)
+      {
+        case pkgCache::State::NotInstalled: WriteOkay(Okay, output, "\nStatus: not-installed"); break;
+        case pkgCache::State::ConfigFiles: WriteOkay(Okay, output, "\nStatus: config-files"); break;
+        case pkgCache::State::HalfInstalled: WriteOkay(Okay, output, "\nStatus: half-installed"); break;
+        case pkgCache::State::UnPacked: WriteOkay(Okay, output, "\nStatus: unpacked"); break;
+        case pkgCache::State::HalfConfigured: WriteOkay(Okay, output, "\nStatus: half-configured"); break;
+        case pkgCache::State::TriggersAwaited: WriteOkay(Okay, output, "\nStatus: triggers-awaited"); break;
+        case pkgCache::State::TriggersPending: WriteOkay(Okay, output, "\nStatus: triggers-pending"); break;
+        case pkgCache::State::Installed: WriteOkay(Okay, output, "\nStatus: installed"); break;
+      }
+   return Okay;
+}
+                                                                       /*}}}*/
+// EIPP::WriteScenario - to the given file descriptor                  /*{{{*/
+template<typename forVersion> void forAllInterestingVersions(pkgDepCache &Cache, pkgCache::PkgIterator const &Pkg, forVersion const &func)
+{
+   if (Pkg->CurrentState == pkgCache::State::NotInstalled)
+   {
+      auto P = Cache[Pkg];
+      if (P.Install() == false)
+        return;
+      func(Pkg, P.InstVerIter(Cache));
+   }
+   else
+   {
+      if (Pkg->CurrentVer != 0)
+        func(Pkg, Pkg.CurrentVer());
+      auto P = Cache[Pkg];
+      auto const V = P.InstVerIter(Cache);
+      if (P.Delete() == false && Pkg.CurrentVer() != V)
+        func(Pkg, V);
+   }
+}
+
+bool EIPP::WriteScenario(pkgDepCache &Cache, FileFd &output, OpProgress * const Progress)
+{
+   if (Progress != NULL)
+      Progress->SubProgress(Cache.Head().PackageCount, _("Send scenario to planner"));
+   unsigned long p = 0;
+   bool Okay = output.Failed() == false;
+   std::vector<std::string> archs = APT::Configuration::getArchitectures();
+   std::vector<bool> pkgset(Cache.Head().PackageCount, false);
+   auto const MarkVersion = [&](pkgCache::PkgIterator const &Pkg, pkgCache::VerIterator const &Ver) {
+      pkgset[Pkg->ID] = true;
+      for (auto D = Ver.DependsList(); D.end() == false; ++D)
+      {
+        if (D.IsCritical() == false)
+           continue;
+        auto const P = D.TargetPkg();
+        for (auto Prv = P.ProvidesList(); Prv.end() == false; ++Prv)
+        {
+           auto const V = Prv.OwnerVer();
+           auto const PV = V.ParentPkg();
+           if (V == PV.CurrentVer() || V == Cache[PV].InstVerIter(Cache))
+              pkgset[PV->ID] = true;
+        }
+        pkgset[P->ID] = true;
+        if (strcmp(P.Arch(), "any") == 0)
+        {
+           APT::StringView const pkgname(P.Name());
+           auto const idxColon = pkgname.find(':');
+           if (idxColon != APT::StringView::npos)
+           {
+              pkgCache::PkgIterator PA;
+              if (pkgname.substr(idxColon + 1) == "any")
+              {
+                 auto const GA = Cache.FindGrp(pkgname.substr(0, idxColon).to_string());
+                 for (auto PA = GA.PackageList(); PA.end() == false; PA = GA.NextPkg(PA))
+                 {
+                    pkgset[PA->ID] = true;
+                 }
+              }
+              else
+              {
+                 auto const PA = Cache.FindPkg(pkgname.to_string());
+                 if (PA.end() == false)
+                    pkgset[PA->ID] = true;
+              }
+           }
+        }
+        else
+        {
+           auto const PA = Cache.FindPkg(P.FullName(false), "any");
+           if (PA.end() == false)
+              pkgset[PA->ID] = true;
+        }
+      }
+   };
+   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
+      forAllInterestingVersions(Cache, Pkg, MarkVersion);
+   auto const WriteVersion = [&](pkgCache::PkgIterator const &Pkg, pkgCache::VerIterator const &Ver) {
+      Okay &= WriteScenarioVersion(output, Pkg, Ver);
+      Okay &= WriteScenarioEIPPVersion(Cache, output, Pkg, Ver);
+      Okay &= WriteScenarioLimitedDependency(output, Ver, pkgset, true);
+      WriteOkay(Okay, output, "\n");
+      if (Progress != NULL && p % 100 == 0)
+        Progress->Progress(p);
+   };
+   for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false && likely(Okay); ++Pkg, ++p)
+   {
+      if (pkgset[Pkg->ID] == false || Pkg->VersionList == 0)
+        continue;
+      forAllInterestingVersions(Cache, Pkg, WriteVersion);
+   }
+   return Okay;
+}
+                                                                       /*}}}*/
+// EIPP::ReadResponse - from the given file descriptor                 /*{{{*/
+bool EIPP::ReadResponse(int const input, pkgPackageManager * const PM, OpProgress *Progress) {
+   /* We build an map id to mmap offset here
+      In theory we could use the offset as ID, but then VersionCount
+      couldn't be used to create other versionmappings anymore and it
+      would be too easy for a (buggy) solver to segfault APT… */
+   unsigned long long const VersionCount = PM->Cache.Head().VersionCount;
+   unsigned long VerIdx[VersionCount];
+   for (pkgCache::PkgIterator P = PM->Cache.PkgBegin(); P.end() == false; ++P) {
+      for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; ++V)
+        VerIdx[V->ID] = V.Index();
+   }
+
+   FileFd in;
+   in.OpenDescriptor(input, FileFd::ReadOnly);
+   pkgTagFile response(&in, 100);
+   pkgTagSection section;
+
+   while (response.Step(section) == true) {
+      char const * type = nullptr;
+      if (section.Exists("Progress") == true) {
+        if (Progress != NULL) {
+           string msg = section.FindS("Message");
+           if (msg.empty() == true)
+              msg = _("Prepare for receiving solution");
+           Progress->SubProgress(100, msg, section.FindI("Percentage", 0));
+        }
+        continue;
+      } else if (section.Exists("Error") == true) {
+        std::string msg = SubstVar(SubstVar(section.FindS("Message"), "\n .\n", "\n\n"), "\n ", "\n");
+        if (msg.empty() == true) {
+           msg = _("External planner failed without a proper error message");
+           _error->Error("%s", msg.c_str());
+        } else
+           _error->Error("External planner failed with: %s", msg.substr(0,msg.find('\n')).c_str());
+        if (Progress != NULL)
+           Progress->Done();
+        std::cerr << "The planner encountered an error of type: " << section.FindS("Error") << std::endl;
+        std::cerr << "The following information might help you to understand what is wrong:" << std::endl;
+        std::cerr << msg << std::endl << std::endl;
+        return false;
+      } else if (section.Exists("Unpack") == true)
+        type = "Unpack";
+      else if (section.Exists("Configure") == true)
+        type = "Configure";
+      else if (section.Exists("Remove") == true)
+        type = "Remove";
+      else {
+        char const *Start, *End;
+        section.GetSection(Start, End);
+        _error->Warning("Encountered an unexpected section with %d fields: %s", section.Count(), std::string(Start, End).c_str());
+        continue;
+      }
+
+      if (type == nullptr)
+        continue;
+      size_t const id = section.FindULL(type, VersionCount);
+      if (id == VersionCount) {
+        _error->Warning("Unable to parse %s request with id value '%s'!", type, section.FindS(type).c_str());
+        continue;
+      } else if (id > PM->Cache.Head().VersionCount) {
+        _error->Warning("ID value '%s' in %s request stanza is to high to refer to a known version!", section.FindS(type).c_str(), type);
+        continue;
+      }
+
+      pkgCache::VerIterator Ver(PM->Cache.GetCache(), PM->Cache.GetCache().VerP + VerIdx[id]);
+      auto const Pkg = Ver.ParentPkg();
+      if (strcmp(type, "Unpack") == 0)
+        PM->Install(Pkg, PM->FileNames[Pkg->ID]);
+      else if (strcmp(type, "Configure") == 0)
+        PM->Configure(Pkg);
+      else if (strcmp(type, "Remove") == 0)
+        PM->Remove(Pkg, PM->Cache[Pkg].Purge());
+   }
+   return in.Failed() == false;
+}
+                                                                       /*}}}*/
+bool EIPP::ReadRequest(int const input, std::list<std::pair<std::string,PKG_ACTION>> &actions,/*{{{*/
+      unsigned int &flags)
+{
+   actions.clear();
+   flags = 0;
+   std::string line;
+   while (ReadLine(input, line) == true)
+   {
+      // Skip empty lines before request
+      if (line.empty() == true)
+        continue;
+      // The first Tag must be a request, so search for it
+      if (line.compare(0, 8, "Request:") != 0)
+        continue;
+
+      while (ReadLine(input, line) == true)
+      {
+        // empty lines are the end of the request
+        if (line.empty() == true)
+           return true;
+
+        PKG_ACTION pkgact = PKG_ACTION::NOOP;
+        if (LineStartsWithAndStrip(line, "Install:"))
+           pkgact = PKG_ACTION::INSTALL;
+        else if (LineStartsWithAndStrip(line, "ReInstall:"))
+           pkgact = PKG_ACTION::REINSTALL;
+        else if (LineStartsWithAndStrip(line, "Remove:"))
+           pkgact = PKG_ACTION::REMOVE;
+        else if (LineStartsWithAndStrip(line, "Architecture:"))
+           _config->Set("APT::Architecture", line);
+        else if (LineStartsWithAndStrip(line, "Architectures:"))
+           _config->Set("APT::Architectures", SubstVar(line, " ", ","));
+        else if (LineStartsWithAndStrip(line, "Planner:"))
+           ; // purely informational line
+        else if (LineStartsWithAndStrip(line, "Immediate-Configuration:"))
+        {
+           if (localStringToBool(line, true))
+              flags |= Request::IMMEDIATE_CONFIGURATION_ALL;
+           else
+              flags |= Request::NO_IMMEDIATE_CONFIGURATION;
+        }
+        else if (ReadFlag(flags, line, "Allow-Temporary-Remove-of-Essentials:", Request::ALLOW_TEMPORARY_REMOVE_OF_ESSENTIALS))
+           ;
+        else
+           _error->Warning("Unknown line in EIPP Request stanza: %s", line.c_str());
+
+        if (pkgact == PKG_ACTION::NOOP)
+           continue;
+        for (auto && p: VectorizeString(line, ' '))
+           actions.emplace_back(std::move(p), pkgact);
+      }
+   }
+   return false;
+}
+                                                                       /*}}}*/
+bool EIPP::ApplyRequest(std::list<std::pair<std::string,PKG_ACTION>> &actions,/*{{{*/
+        pkgDepCache &Cache)
+{
+   for (auto Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
+   {
+      short versions = 0;
+      for (auto Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
+      {
+        ++versions;
+        if (Pkg.CurrentVer() == Ver)
+           continue;
+        Cache.SetCandidateVersion(Ver);
+      }
+      if (unlikely(versions > 2))
+        _error->Warning("Package %s has %d versions, but should have at most 2!", Pkg.FullName().c_str(), versions);
+   }
+   for (auto && a: actions)
+   {
+      pkgCache::PkgIterator P = Cache.FindPkg(a.first);
+      if (P.end() == true)
+      {
+        _error->Warning("Package %s is not known, so can't be acted on", a.first.c_str());
+        continue;
+      }
+      switch (a.second)
+      {
+        case PKG_ACTION::NOOP:
+           _error->Warning("Package %s has NOOP as action?!?", a.first.c_str());
+           break;
+        case PKG_ACTION::INSTALL:
+           Cache.MarkInstall(P, false);
+           break;
+        case PKG_ACTION::REINSTALL:
+           Cache.MarkInstall(P, false);
+           Cache.SetReInstall(P, true);
+           break;
+        case PKG_ACTION::REMOVE:
+           Cache.MarkDelete(P);
+           break;
+      }
+   }
+   return true;
+}
+                                                                       /*}}}*/