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

#include <apt-pkg/acquire-item.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/algorithms.h>
#include <apt-pkg/cachefile.h>
#include <apt-pkg/cacheset.h>
#include <apt-pkg/cmndline.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/depcache.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/install-progress.h>
#include <apt-pkg/macros.h>
#include <apt-pkg/packagemanager.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/pkgrecords.h>
#include <apt-pkg/pkgsystem.h>
#include <apt-pkg/prettyprinters.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/upgrade.h>
#include <apt-pkg/version.h>

#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <vector>
#include <langinfo.h>
#include <sys/statvfs.h>

#include <apt-private/acqprogress.h>
#include <apt-private/private-cachefile.h>
#include <apt-private/private-cacheset.h>
#include <apt-private/private-download.h>
#include <apt-private/private-install.h>
#include <apt-private/private-json-hooks.h>
#include <apt-private/private-output.h>
#include <apt-private/private-update.h>

#include <apti18n.h>
									/*}}}*/
class pkgSourceList;

static bool CheckNothingBroken(std::ostream &out, CacheFile &Cache) /*{{{*/
{
   // Now we check the state of the packages,
   if (Cache->BrokenCount() == 0)
      return true;

   // FIXME: if an external solver showed an error, we shouldn't show one here
   if (_error->PendingError() && _config->Find("APT::Solver") == "dump")
      return false;

   out << _("Some packages could not be installed. This may mean that you have\n"
	    "requested an impossible situation or if you are using the unstable\n"
	    "distribution that some required packages have not yet been created\n"
	    "or been moved out of Incoming.")
       << std::endl;
   /*
   if (Packages == 1)
   {
      c1out << std::endl;
      c1out <<
	 _("Since you only requested a single operation it is extremely likely that\n"
	       "the package is simply not installable and a bug report against\n"
	       "that package should be filed.") << std::endl;
   }
   */

   out << _("The following information may help to resolve the situation:") << std::endl;
   out << std::endl;
   ShowBroken(out, Cache, false);
   if (_error->PendingError() == true)
      return false;
   else
      return _error->Error(_("Broken packages"));
}
bool CheckNothingBroken(CacheFile &Cache)
{
   return CheckNothingBroken(c1out, Cache);
}
									/*}}}*/
// WriteApportReport - Write an apport bug report	 		/*{{{*/
// ---------------------------------------------------------------------
static void WriteApportReport(pkgCacheFile &Cache, std::string &title, std::vector<std::string> const &errors, int mode, bool distUpgrade)
{
   auto dumpfile = flCombine(_config->FindDir("Dir::Log"), "edsp.log.zst");
   auto crashfile = flCombine(_config->FindDir("Dir::Apport", "/var/crash"), "apt-edsp." + std::to_string(getuid()) + ".crash");
   auto apt = Cache->FindPkg("apt");
   if (access(flNotFile(dumpfile).c_str(), W_OK) != 0 || access(flNotFile(crashfile).c_str(), W_OK) != 0)
      return;
   OpTextProgress Progress(*_config);
   Progress.OverallProgress(0, 100, 50, _("Writing error report"));
   FileFd edspDump(dumpfile,
		   FileFd::Exclusive | FileFd::Create | FileFd::WriteOnly | FileFd::BufferedWrite,
		   FileFd::Extension);
   int edspFlags = 0;
   if (mode || distUpgrade)
      edspFlags |= EDSP::Request::UPGRADE_ALL;
   if (mode & APT::Upgrade::FORBID_REMOVE_PACKAGES)
      edspFlags |= EDSP::Request::FORBID_REMOVE;
   if (mode & APT::Upgrade::FORBID_INSTALL_NEW_PACKAGES)
      edspFlags |= EDSP::Request::FORBID_NEW_INSTALL;

   EDSP::WriteRequest(Cache, edspDump, edspFlags, &Progress);
   EDSP::WriteLimitedScenario(Cache, edspDump, &Progress);
   edspDump.Close();

   Progress.OverallProgress(50, 100, 50, _("Writing error report"));

   std::ofstream crash(crashfile, std::ios::out | std::ios::trunc);
   chmod(crashfile.c_str(), 0600);
   time_t now = time(NULL);
   char ctime_buf[26]; // need at least 26 bytes according to ctime(3)
   crash << "ProblemType: AptSolver\n"
	 << "Architecture: " << _config->Find("APT::Architecture") << "\n"
	 << "Date: " << ctime_r(&now, ctime_buf)
	 << "Package: apt " << (apt.end() || apt.CurrentVer().end() ? "" : apt.CurrentVer().VerStr()) << "\n"
	 << "Title: " << title << "\n"
	 << "SourcePackage: apt\n";

   if (not errors.empty())
   {
      crash << "ErrorMessage:\n";
      for (auto &error : errors)
      {
	 crash << " " << SubstVar(SubstVar(APT::String::Strip(error), "\n\n", "\n.\n"), "\n", "\n ") << "\n";
      }
   }

   std::ifstream toCopy(edspDump.Name());
   std::ostringstream readStream;
   readStream << toCopy.rdbuf();
   const auto base64 = Base64Encode(readStream.str());
   if (not base64.empty())
   {
      crash << "AptSolverDump:\n";
      // Print the base64, with line wrapping, indented by one space; substr(i, 76)
      // returns at most 76 characters or as many as are left.
      for (size_t i=0; i < base64.size(); i += 76)
	 crash << " " << std::string_view{base64}.substr(i, 76) << "\n";
   }
   crash.close();
}

// InstallPackages - Actually download and install the packages		/*{{{*/
// ---------------------------------------------------------------------
/* This displays the informative messages describing what is going to 
   happen and then calls the download routines */
class SimulateWithActionGroupInhibited : public pkgSimulate
{
public:
      SimulateWithActionGroupInhibited(CacheFile &Cache) : pkgSimulate(Cache) { Sim.IncreaseActionGroupLevel(); }
      SimulateWithActionGroupInhibited(SimulateWithActionGroupInhibited const &Cache) = delete;
      SimulateWithActionGroupInhibited(SimulateWithActionGroupInhibited &&Cache) = delete;
      SimulateWithActionGroupInhibited& operator=(SimulateWithActionGroupInhibited const &Cache) = delete;
      SimulateWithActionGroupInhibited& operator=(SimulateWithActionGroupInhibited &&Cache) = delete;
      ~SimulateWithActionGroupInhibited() = default;
};
static void RemoveDownloadNeedingItemsFromFetcher(pkgAcquire &Fetcher, bool &Transient)
{
   for (pkgAcquire::ItemIterator I = Fetcher.ItemsBegin(); I < Fetcher.ItemsEnd();)
   {
      if ((*I)->Local == true)
      {
	 ++I;
	 continue;
      }

      // Close the item and check if it was found in cache
      (*I)->Finished();
      if ((*I)->Complete == false)
	 Transient = true;

      // Clear it out of the fetch list
      delete *I;
      I = Fetcher.ItemsBegin();
   }
}
#ifdef REQUIRE_MERGED_USR
// \brief Issues a warning about usrmerge when destructed so we can call it after install finished or failed or whatever.
struct WarnUsrMerge {
   CacheFile &Cache;
   WarnUsrMerge(CacheFile &Cache) : Cache(Cache) {

   }
   void warn() {
      auto usrmergePkg = Cache->FindPkg("usrmerge");
      if (not APT::Configuration::isChroot() && _config->FindDir("Dir") == std::string("/") &&
	  not usrmergePkg.end() && not usrmergePkg.VersionList().end() &&
	  not Cache[usrmergePkg].Install() && not APT::Configuration::checkUsrMerged())
      {
	 _error->Warning(_("Unmerged usr is no longer supported, use usrmerge to convert to a merged-usr system."));
	 for (auto VF = usrmergePkg.VersionList().FileList(); not VF.end(); ++VF)
	    if (VF.File().Origin() != nullptr && VF.File().Origin() == std::string("Debian"))
	    {
	       // TRANSLATORS: %s is a url to a page describing merged-usr (bookworm release notes)
	       _error->Notice(_("See %s for more details."), "https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#a-merged-usr-is-now-required");
	       break;
	    }
      }
   }
   ~WarnUsrMerge() {
      warn();
   }
};
#endif
static void ShowWeakDependencies(CacheFile &Cache);
bool InstallPackages(CacheFile &Cache, APT::PackageVector &HeldBackPackages, bool ShwKept, bool Ask, bool Safety, std::string const &Hook, CommandLine const &CmdL)
{
   auto outVer = _config->FindI("APT::Output-Version");
#ifdef REQUIRE_MERGED_USR
   WarnUsrMerge warnUsrMerge(Cache);
#endif
   if (not RunScripts("APT::Install::Pre-Invoke"))
      return false;
   if (_config->FindB("APT::Get::Purge", false) == true)
      for (pkgCache::PkgIterator I = Cache->PkgBegin(); I.end() == false; ++I)
	 if (Cache[I].Delete() == true && Cache[I].Purge() == false)
	    Cache->MarkDelete(I,true);

   // Create the download object
   auto const DownloadAllowed = _config->FindB("APT::Get::Download",true);
   aptAcquireWithTextStatus Fetcher;
   if (_config->FindB("APT::Get::Print-URIs", false) == true)
   {
      // force a hashsum for compatibility reasons
      _config->CndSet("Acquire::ForceHash", "md5sum");
   }
   else if (_config->FindB("APT::Get::Simulate") == true)
      ;
   else if (Fetcher.GetLock(_config->FindDir("Dir::Cache::Archives")) == false)
      return false;

   // Read the source list
   if (Cache.BuildSourceList() == false)
      return false;
   pkgSourceList * const List = Cache.GetSourceList();

   // Create the text record parser
   pkgRecords Recs(Cache);
   if (_error->PendingError() == true)
      return false;

   // Create the package manager and prepare to download
   std::unique_ptr<pkgPackageManager> PM(_system->CreatePM(Cache));
   if (PM->GetArchives(&Fetcher,List,&Recs) == false || 
       _error->PendingError() == true)
      return false;

   if (DownloadAllowed == false)
   {
      bool Missing = false;
      RemoveDownloadNeedingItemsFromFetcher(Fetcher, Missing);
      if (Missing)
      {
	 if (_config->FindB("APT::Get::Fix-Missing",false))
	 {
	    PM->FixMissing();
	    SortedPackageUniverse Universe(Cache);
	    APT::PackageVector NewHeldBackPackages;
	    for (auto const &Pkg: Universe)
	    {
	       if (Pkg->CurrentVer == 0 || Cache[Pkg].Delete())
		  continue;
	       if (Cache[Pkg].Upgradable() && not Cache[Pkg].Upgrade())
		  NewHeldBackPackages.push_back(Pkg);
	       else if (std::find(HeldBackPackages.begin(), HeldBackPackages.end(), Pkg) != HeldBackPackages.end())
		  NewHeldBackPackages.push_back(Pkg);
	    }
	    std::swap(NewHeldBackPackages, HeldBackPackages);
	 }
	 else
	    return _error->Error(_("Unable to fetch some archives, maybe run apt update or try with --fix-missing?"));
      }
      Fetcher.Shutdown();
      if (_error->PendingError() == true)
	 return false;
   }

   // Show all the various warning indicators
   if (_config->FindI("APT::Output-Version") < 30)
      ShowDel(c1out,Cache);
   if (_config->FindI("APT::Output-Version") >= 30 && _config->FindB("APT::Get::Show-Upgraded",true) == true)
      ShowUpgraded(c1out,Cache);
   ShowNew(c1out,Cache);
   if (_config->FindI("APT::Output-Version") >= 30)
      ShowWeakDependencies(Cache);
   if (ShwKept == true)
   {
      APT::PackageVector PhasingPackages;
      APT::PackageVector NotPhasingHeldBackPackages;
      for (auto const &Pkg : HeldBackPackages)
      {
	 if (Cache->PhasingApplied(Pkg))
	    PhasingPackages.push_back(Pkg);
	 else
	    NotPhasingHeldBackPackages.push_back(Pkg);
      }

      ShowPhasing(c1out, Cache, PhasingPackages);
      ShowKept(c1out, Cache, NotPhasingHeldBackPackages);
      if (not PhasingPackages.empty() && not NotPhasingHeldBackPackages.empty())
	 _error->Notice("Some packages may have been kept back due to phasing.");
   }
   bool const Hold = not ShowHold(c1out,Cache);
   if (_config->FindI("APT::Output-Version") < 30 && _config->FindB("APT::Get::Show-Upgraded",true) == true)
      ShowUpgraded(c1out,Cache);
   bool const Downgrade = !ShowDowngraded(c1out,Cache);

   // Show removed packages last
   if (_config->FindI("APT::Output-Version") >= 30)
      ShowDel(c1out,Cache);
   bool Essential = false;
   if (_config->FindB("APT::Get::Download-Only",false) == false)
        Essential = !ShowEssential(c1out,Cache);

   if (not Hook.empty())
      RunJsonHook(Hook, "org.debian.apt.hooks.install.package-list", CmdL.FileList, Cache);

   Stats(c1out,Cache, HeldBackPackages);
   if (not Hook.empty())
      RunJsonHook(Hook, "org.debian.apt.hooks.install.statistics", CmdL.FileList, Cache);

   // Sanity check
   if (Cache->BrokenCount() != 0)
   {
      ShowBroken(c1out,Cache,false);
      return _error->Error(_("Internal error, InstallPackages was called with broken packages!"));
   }

   if (Cache->DelCount() == 0 && Cache->InstCount() == 0 &&
       Cache->BadCount() == 0)
      return RunScripts("APT::Install::Post-Invoke-Success");

   // No remove flag
   if (Cache->DelCount() != 0 && _config->FindB("APT::Get::Remove",true) == false)
      return _error->Error(_("Packages need to be removed but remove is disabled."));

#ifdef REQUIRE_MERGED_USR
   warnUsrMerge.warn();
#endif

   // Fail safe check
   bool const Fail = (Essential || Downgrade || Hold);
   if (_config->FindI("quiet",0) >= 2 ||
       _config->FindB("APT::Get::Assume-Yes",false) == true)
   {
      if (Fail == true && _config->FindB("APT::Get::Force-Yes",false) == false) {
	 if (Essential == true && _config->FindB("APT::Get::allow-remove-essential", false) == false)
	    return _error->Error(_("Essential packages were removed and -y was used without --allow-remove-essential."));
	 if (Downgrade == true && _config->FindB("APT::Get::allow-downgrades", false) == false)
	    return _error->Error(_("Packages were downgraded and -y was used without --allow-downgrades."));
	 if (Hold == true && _config->FindB("APT::Get::allow-change-held-packages", false) == false)
	    return _error->Error(_("Held packages were changed and -y was used without --allow-change-held-packages."));
      }
   }

   // Run the simulator ..
   if (_config->FindB("APT::Get::Simulate") == true)
   {
      SimulateWithActionGroupInhibited PM(Cache);

      APT::Progress::PackageManager *progress = APT::Progress::PackageManagerProgressFactory();
      pkgPackageManager::OrderResult Res = PM.DoInstall(progress);
      delete progress;

      if (Res == pkgPackageManager::Failed)
	 return false;
      if (Res != pkgPackageManager::Completed)
	 return _error->Error(_("Internal error, Ordering didn't finish"));
      return true;
   }

   auto const FetchBytes = DownloadAllowed ? Fetcher.FetchNeeded() : 0;
   auto const FetchPBytes = DownloadAllowed ? Fetcher.PartialPresent() : 0;
   if (DownloadAllowed)
   {
      // Display statistics
      auto const DebBytes = Fetcher.TotalNeeded();
      if (DebBytes != Cache->DebSize())
      {
	 c0out << "E: " << DebBytes << ',' << Cache->DebSize() << std::endl;
	 c0out << "E: " << _("How odd... The sizes didn't match, email apt@packages.debian.org") << std::endl;
      }

      // Number of bytes
      if (DebBytes != FetchBytes)
	 //TRANSLATOR: The required space between number and unit is already included
	 // in the replacement strings, so %sB will be correctly translate in e.g. 1,5 MB
	 ioprintf(c1out,outVer < 30 ? _("Need to get %sB/%sB of archives.\n") : _("  Download size: %sB / %sB\n"),
	       SizeToStr(FetchBytes).c_str(),SizeToStr(DebBytes).c_str());
      else if (DebBytes != 0)
	 //TRANSLATOR: The required space between number and unit is already included
	 // in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
	 ioprintf(c1out,outVer < 30 ? _("Need to get %sB of archives.\n") : _("  Download size: %sB\n"),
	       SizeToStr(DebBytes).c_str());
   }

   // Size delta
   if (Cache->UsrSize() >= 0)
   {
      //TRANSLATOR: The required space between number and unit is already included
      // in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
      if (outVer < 30)
	 ioprintf(c1out, _("After this operation, %sB of additional disk space will be used.\n"),
		  SizeToStr(Cache->UsrSize()).c_str());
      else
      {
	 struct statvfs st;
	 if (statvfs(_config->FindDir("Dir::Usr").c_str(), &st) == 0)
	 {
	    struct statvfs st_boot;
	    unsigned long long BootSize = 0;
	    unsigned long long InitrdSize = 0;
	    if (statvfs(_config->FindDir("Dir::Boot").c_str(), &st_boot) == 0 && st_boot.f_fsid != st.f_fsid)
	       BootSize = Cache->BootSize(false);
	    else
	       InitrdSize = Cache->BootSize(true); /* initrd only, adding to /usr space */

	    ioprintf(c1out, "  ");
	    // TRANSLATOR: The required space between number and unit is already included
	    //  in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
	    ioprintf(c1out, _("Space needed: %sB / %sB available\n"),
		     SizeToStr(Cache->UsrSize() + InitrdSize).c_str(), SizeToStr((st.f_bsize * st.f_bavail)).c_str());

	    if (Cache->UsrSize() > 0 && static_cast<unsigned long long>(Cache->UsrSize()) > (st.f_bsize * st.f_bavail))
	    {
	       // TRANSLATOR: The required space between number and unit is already included
	       //  in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
	       _error->Warning(_("More space needed than available: %sB > %sB, installation may fail"),
			       SizeToStr(Cache->UsrSize()).c_str(),
			       SizeToStr((st.f_bsize * st.f_bavail)).c_str());
	    }
	    if (BootSize != 0)
	    {
	       bool Unicode = strcmp(nl_langinfo(CODESET), "UTF-8") == 0;
	       ioprintf(c1out,   Unicode ? "  └─ " : "   - ");
	       // TRANSLATOR: The required space between number and unit is already included
	       //  in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB -
	       //  The first %s is the location of the boot directory (determined from Dir::Boot),
	       //  and it tells the space being needed there.
	       //  (We have two spaces to align with parent "space needed:"for /boot)
	       ioprintf(c1out, _("in %s:  %sB / %sB available\n"),
			_config->FindFile("Dir::Boot").c_str(), SizeToStr(BootSize).c_str(), SizeToStr((st_boot.f_bsize * st_boot.f_bavail)).c_str());
	       if (BootSize > (st_boot.f_bsize * st_boot.f_bavail))
		  // TRANSLATOR: The required space between number and unit is already included
		  //  in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
		  //  The first %s is the location of the boot directory (determined from Dir::Boot)
		  _error->Warning(_("More space needed in %s than available: %sB > %sB, installation may fail"),
				  _config->FindFile("Dir::Boot").c_str(),
				  SizeToStr(BootSize).c_str(),
				  SizeToStr((st_boot.f_bsize * st_boot.f_bavail)).c_str());
	    }
	 }
	 else
	 {
	    // TRANSLATOR: The required space between number and unit is already included
	    //  in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
	    ioprintf(c1out, "  ");
	    ioprintf(c1out, _("Space needed: %sB\n"), SizeToStr(Cache->UsrSize()).c_str());
	 }
      }
   }
   else
      //TRANSLATOR: The required space between number and unit is already included
      // in the replacement string, so %sB will be correctly translate in e.g. 1,5 MB
      ioprintf(c1out,outVer < 30 ? _("After this operation, %sB disk space will be freed.\n") : _("  Freed space: %sB\n"),
	       SizeToStr(-1*Cache->UsrSize()).c_str());

   if (outVer >= 30)
      ioprintf(c1out,"\n");
   if (DownloadAllowed)
      if (CheckFreeSpaceBeforeDownload(_config->FindDir("Dir::Cache::Archives"), (FetchBytes - FetchPBytes)) == false)
	 return false;

   if (_error->PendingError() == true)
      return false;

   // Just print out the uris an exit if the --print-uris flag was used
   if (_config->FindB("APT::Get::Print-URIs") == true)
   {
      pkgAcquire::UriIterator I = Fetcher.UriBegin();
      for (; I != Fetcher.UriEnd(); ++I)
	 std::cout << '\'' << I->URI << "' " << flNotDir(I->Owner->DestFile) << ' ' <<
	       std::to_string(I->Owner->FileSize) << ' ' << I->Owner->HashSum() << std::endl;
      return true;
   }

   if (Essential == true && Safety == true && _config->FindB("APT::Get::allow-remove-essential", false) == false)
   {
      if (_config->FindB("APT::Get::Trivial-Only",false) == true)
	 return _error->Error(_("Trivial Only specified but this is not a trivial operation."));

      return _error->Error(_("Removing essential system-critical packages is not permitted. This might break the system."));
   }
   else
   {
      // Prompt to continue
      if (Ask == true || Fail == true)
      {
	 if (_config->FindB("APT::Get::Trivial-Only",false) == true)
	    return _error->Error(_("Trivial Only specified but this is not a trivial operation."));

	 if (_config->FindI("quiet",0) < 2 &&
	     _config->FindB("APT::Get::Assume-Yes",false) == false)
	 {
	    // YnPrompt shows all warnings before prompting, so ask stronger and default to N if we have any.
	    auto Default = outVer < 30 ? true : _error->empty();
	    if (not YnPrompt(outVer < 30 ? _("Do you want to continue?") : (Default ? _("Continue?") : _("Continue anyway?")), Default))
	    {
	       c2out << _("Abort.") << std::endl;
	       exit(1);
	    }
	 }
      }
   }

   if (!CheckAuth(Fetcher, true))
      return false;

   /* Unlock the dpkg lock if we are not going to be doing an install
      after. */
   if (_config->FindB("APT::Get::Download-Only",false) == true)
      _system->UnLock();

   // Run it
   bool Failed = false;
   while (1)
   {
      bool Transient = false;
      if (AcquireRun(Fetcher, 0, &Failed, &Transient) == false)
	 return false;

      if (_config->FindB("APT::Get::Download-Only",false) == true)
      {
	 if (Failed == true && _config->FindB("APT::Get::Fix-Missing",false) == false)
	    return _error->Error(_("Some files failed to download"));
	 c1out << _("Download complete and in download only mode") << std::endl;
	 return true;
      }

      if (Failed == true && _config->FindB("APT::Get::Fix-Missing",false) == false)
	 return _error->Error(_("Unable to fetch some archives, maybe run apt update or try with --fix-missing?"));

      if (Transient == true && Failed == true)
	 return _error->Error(_("--fix-missing and media swapping is not currently supported"));

      // Try to deal with missing package files
      if (Failed == true && PM->FixMissing() == false)
      {
	 c2out << _("Unable to correct missing packages.") << std::endl;
	 return _error->Error(_("Aborting install."));
      }

      auto const progress = APT::Progress::PackageManagerProgressFactory();
      _system->UnLockInner();
      pkgPackageManager::OrderResult const Res = PM->DoInstall(progress);
      delete progress;

      if (Res == pkgPackageManager::Failed || _error->PendingError() == true)
	 return false;
      if (Res == pkgPackageManager::Completed)
	 break;

      _system->LockInner();

      // Reload the fetcher object and loop again for media swapping
      Fetcher.Shutdown();
      if (PM->GetArchives(&Fetcher,List,&Recs) == false)
	 return false;

      Failed = false;
      if (DownloadAllowed == false)
	 RemoveDownloadNeedingItemsFromFetcher(Fetcher, Failed);
   }

   std::set<std::string> const disappearedPkgs = PM->GetDisappearedPackages();
   if (disappearedPkgs.empty() == false)
   {
      ShowList(c1out, P_("The following package disappeared from your system as\n"
	       "all files have been overwritten by other packages:",
	       "The following packages disappeared from your system as\n"
	       "all files have been overwritten by other packages:", disappearedPkgs.size()), disappearedPkgs,
	    [](std::string const &Pkg) { return Pkg.empty() == false; },
	    [](std::string const &Pkg) { return Pkg; },
	    [](std::string const &) { return std::string(); });
      c0out << _("Note: This is done automatically and on purpose by dpkg.") << std::endl;
   }

   // cleanup downloaded debs
   if (_config->FindB("APT::Keep-Downloaded-Packages", true) == false)
   {
      std::string const archivedir = _config->FindDir("Dir::Cache::archives");
      for (auto I = Fetcher.ItemsBegin(); I != Fetcher.ItemsEnd(); ++I)
      {
	 if (flNotFile((*I)->DestFile) != archivedir || (*I)->Local)
	    continue;
         RemoveFile("Keep-Downloaded-Packages=false", (*I)->DestFile);
      }
   }

   if (not RunScripts("APT::Install::Post-Invoke-Success"))
      return false;

   return true;
}
									/*}}}*/
// DoAutomaticRemove - Remove all automatic unused packages		/*{{{*/
// ---------------------------------------------------------------------
/* Remove unused automatic packages */
bool DoAutomaticRemove(CacheFile &Cache)
{
   bool Debug = _config->FindB("Debug::pkgAutoRemove",false);
   bool doAutoRemove = _config->FindB("APT::Get::AutomaticRemove", false);
   bool doAutoRemoveKernels = _config->FindB("APT::Get::AutomaticRemove::Kernels", false);
   bool hideAutoRemove = _config->FindB("APT::Get::HideAutoRemove");

   std::unique_ptr<APT::CacheFilter::Matcher> kernelAutoremovalMatcher;
   if (doAutoRemoveKernels && !doAutoRemove)
   {
      kernelAutoremovalMatcher = APT::KernelAutoRemoveHelper::GetProtectedKernelsFilter(Cache, true);
   }

   if(Debug)
      std::cout << "DoAutomaticRemove()" << std::endl;

   if (doAutoRemove == true &&
	_config->FindB("APT::Get::Remove",true) == false)
   {
      c1out << _("We are not supposed to delete stuff, can't start "
		 "AutoRemover") << std::endl;
      return false;
   }
   Cache->MarkAndSweep();

   bool purgePkgs = _config->FindB("APT::Get::Purge", false);
   bool smallList = (hideAutoRemove == false &&
		strcasecmp(_config->Find("APT::Get::HideAutoRemove","").c_str(),"small") == 0);

   unsigned long autoRemoveCount = 0;
   APT::PackageSet tooMuch;
   SortedPackageUniverse Universe(Cache);
   // look over the cache to see what can be removed
   for (auto const &Pkg: Universe)
   {
      if (Cache[Pkg].Garbage)
      {
	 if(Pkg.CurrentVer() != 0 || Cache[Pkg].Install())
	    if(Debug)
	       std::cout << "We could delete " <<  APT::PrettyPkg(Cache, Pkg) << std::endl;

	 if (doAutoRemove || (kernelAutoremovalMatcher != nullptr && (*kernelAutoremovalMatcher)(Pkg)))
	 {
	    if(Pkg.CurrentVer() != 0 &&
	       Pkg->CurrentState != pkgCache::State::ConfigFiles)
	       Cache->MarkDelete(Pkg, purgePkgs, 0, false);
	    else
	       Cache->MarkKeep(Pkg, false, false);
	 }
	 else
	 {
	    // if the package is a new install and already garbage we don't need to
	    // install it in the first place, so nuke it instead of show it
	    if (Cache[Pkg].Install() == true && Pkg.CurrentVer() == 0)
	    {
	       tooMuch.insert(Pkg);
	       Cache->MarkDelete(Pkg, false, 0, false);
	    }
	    // only show stuff in the list that is not yet marked for removal
	    else if(hideAutoRemove == false && Cache[Pkg].Delete() == false)
	       ++autoRemoveCount;
	 }
      }
   }

   // we could have removed a new dependency of a garbage package,
   // so check if a reverse depends is broken and if so install it again.
   if (tooMuch.empty() == false && (Cache->BrokenCount() != 0 || Cache->PolicyBrokenCount() != 0))
   {
      bool Changed;
      do {
	 Changed = false;
	 for (APT::PackageSet::iterator Pkg = tooMuch.begin();
	      Pkg != tooMuch.end(); ++Pkg)
	 {
	    auto const PkgCand = Cache[Pkg].CandidateVerIter(Cache);
	    if (unlikely(PkgCand.end()))
	       continue;
	    std::vector<std::pair<pkgCache::PkgIterator, char const *>> too;
	    too.emplace_back(*Pkg, PkgCand.VerStr());
	    for (pkgCache::PrvIterator Prv = PkgCand.ProvidesList(); not Prv.end(); ++Prv)
	       too.emplace_back(Prv.ParentPkg(), Prv.ProvideVersion());
	    for (auto const &[P, PVerStr] : too)
	    {
	       for (pkgCache::DepIterator R = P.RevDependsList();
		    R.end() == false; ++R)
	       {
		  if (R.IsNegative() == true ||
		      Cache->IsImportantDep(R) == false)
		     continue;
		 auto const RV = R.ParentVer();
		 if (unlikely(RV.end() == true))
		    continue;
		 auto const RP = RV.ParentPkg();
		 // check if that dependency comes from an interesting version
		 if (RP.CurrentVer() == RV)
		 {
		    if ((*Cache)[RP].Keep() == false)
		       continue;
		 }
		 else if (Cache[RP].CandidateVerIter(Cache) == RV)
		 {
		    if ((*Cache)[RP].NewInstall() == false && (*Cache)[RP].Upgrade() == false)
		       continue;
		 }
		 else // ignore dependency from a non-candidate version
		    continue;
		 if (R->Version != 0)
		 {
		    if (not Cache->VS().CheckDep(PVerStr, R->CompareOp, R.TargetVer()))
		       continue;
		 }
		 // ignore new providers if we have installed providers
		 if (Pkg->CurrentVer == 0)
		 {
		    std::unique_ptr<pkgCache::Version *[]> VList(R.AllTargets());
		    bool has_installed_alt_prov = false;
		    for (pkgCache::Version **V = VList.get(); *V != 0; ++V)
		    {
		       pkgCache::VerIterator Ver(Cache, *V);
		       auto const P = Ver.ParentPkg();
		       if (not P.end() && P->CurrentVer != 0 && Cache[P].InstallVer == *V)
		       {
			  has_installed_alt_prov = true;
			  break;
		       }
		    }
		    if (has_installed_alt_prov)
		       continue;
		 }
		 if (Debug == true)
		    std::clog << "Save " << APT::PrettyPkg(Cache, Pkg) << " as another installed package depends on it: " << APT::PrettyPkg(Cache, RP) << std::endl;
		 Cache->MarkInstall(Pkg, false, 0, false);
		 if (hideAutoRemove == false)
		    ++autoRemoveCount;
		 tooMuch.erase(Pkg);
		 Changed = true;
		 break;
	       }
	       if (Changed == true)
		  break;
	    }
	    if (Changed == true)
	       break;
	 }
      } while (Changed == true);
   }

   // Now see if we had destroyed anything (if we had done anything)
   if (Cache->BrokenCount() != 0)
   {
      c1out << _("Hmm, seems like the AutoRemover destroyed something which really\n"
	         "shouldn't happen. Please file a bug report against apt.") << std::endl;
      c1out << std::endl;
      c1out << _("The following information may help to resolve the situation:") << std::endl;
      c1out << std::endl;
      ShowBroken(c1out,Cache,false);

      return _error->Error(_("Internal Error, AutoRemover broke stuff"));
   }

   // if we don't remove them, we should show them!
   if (doAutoRemove == false && autoRemoveCount != 0)
   {
      std::string note;
      std::string autocmd = "apt autoremove";
      if (getenv("SUDO_USER") != nullptr)
      {
	 auto const envsudocmd = getenv("SUDO_COMMAND");
	 auto const envshell = getenv("SHELL");
	 if (envsudocmd == nullptr || envshell == nullptr || strcmp(envsudocmd, envshell) != 0)
	    autocmd = "sudo " + autocmd;
      }
      strprintf(note, P_("Use '%s' to remove it.", "Use '%s' to remove them.", autoRemoveCount), autocmd.c_str());
      if (smallList == false)
      {
	 // trigger marking now so that the package list is correct
	 Cache->MarkAndSweep();
	 SortedPackageUniverse Universe(Cache);
	 ShowList(c1out, P_("The following package was automatically installed and is no longer required:",
	          "The following packages were automatically installed and are no longer required:",
	          autoRemoveCount), Universe,
	       [&Cache](pkgCache::PkgIterator const &Pkg) { return (*Cache)[Pkg].Garbage == true && (*Cache)[Pkg].Delete() == false; },
	       &PrettyFullName, CurrentVersion(&Cache), "", note);
      }
      else
      {
	 ioprintf(c1out, P_("%lu package was automatically installed and is no longer required.\n",
	          "%lu packages were automatically installed and are no longer required.\n", autoRemoveCount), autoRemoveCount);
	 c1out << note << std::endl;
      }
   }
   return true;
}
									/*}}}*/
// DoCacheManipulationFromCommandLine					/*{{{*/
static const unsigned short MOD_REMOVE = 1;
static const unsigned short MOD_INSTALL = 2;

bool DoCacheManipulationFromCommandLine(CommandLine &CmdL, std::vector<PseudoPkg> &VolatileCmdL, CacheFile &Cache, int UpgradeMode,
					APT::PackageVector &HeldBackPackages)
{
   std::map<unsigned short, APT::VersionVector> verset;
   std::set<std::string> UnknownPackages;
   return DoCacheManipulationFromCommandLine(CmdL, VolatileCmdL, Cache, verset, UpgradeMode, UnknownPackages, HeldBackPackages);
}
bool DoCacheManipulationFromCommandLine(CommandLine &CmdL, std::vector<PseudoPkg> &VolatileCmdL, CacheFile &Cache,
					std::map<unsigned short, APT::VersionVector> &verset, int UpgradeMode,
					std::set<std::string> &UnknownPackages, APT::PackageVector &HeldBackPackages)
{
   // Enter the special broken fixing mode if the user specified arguments
   bool BrokenFix = false;
   if (Cache->BrokenCount() != 0)
      BrokenFix = true;

   std::unique_ptr<pkgProblemResolver> Fix(nullptr);
   if (_config->FindB("APT::Get::CallResolver", true) == true)
      Fix.reset(new pkgProblemResolver(Cache));

   unsigned short fallback = MOD_INSTALL;
   if (strcasecmp(CmdL.FileList[0], "reinstall") == 0)
      _config->Set("APT::Get::ReInstall", "true");
   else if (strcasecmp(CmdL.FileList[0],"remove") == 0)
      fallback = MOD_REMOVE;
   else if (strcasecmp(CmdL.FileList[0], "purge") == 0)
   {
      _config->Set("APT::Get::Purge", true);
      fallback = MOD_REMOVE;
   }
   else if (strcasecmp(CmdL.FileList[0], "autoremove") == 0 ||
	    strcasecmp(CmdL.FileList[0], "auto-remove") == 0)
   {
      _config->Set("APT::Get::AutomaticRemove", "true");
      fallback = MOD_REMOVE;
   }
   else if (strcasecmp(CmdL.FileList[0], "autopurge") == 0)
   {
      _config->Set("APT::Get::AutomaticRemove", "true");
      _config->Set("APT::Get::Purge", true);
      fallback = MOD_REMOVE;
   }

   // We need to MarkAndSweep before parsing commandline so that ?garbage pattern works correctly.
   Cache->MarkAndSweep();

   std::list<APT::VersionSet::Modifier> mods;
   mods.push_back(APT::VersionSet::Modifier(MOD_INSTALL, "+",
		APT::VersionSet::Modifier::POSTFIX, APT::CacheSetHelper::CANDIDATE));
   mods.push_back(APT::VersionSet::Modifier(MOD_REMOVE, "-",
		APT::VersionSet::Modifier::POSTFIX, APT::CacheSetHelper::NEWEST));
   CacheSetHelperAPTGet helper(c0out);
   verset = APT::VersionVector::GroupedFromCommandLine(Cache,
		CmdL.FileList + 1, mods, fallback, helper);
   for (auto &vs : verset)
   {
      std::set<map_id_t> seen;
      vs.second.erase(std::remove_if(vs.second.begin(), vs.second.end(), [&](auto const &p) { return not seen.insert(p->ID).second; }), vs.second.end());
   }

   for (auto const &I: VolatileCmdL)
   {
      pkgCache::PkgIterator const P = Cache->FindPkg(I.name);
      if (P.end())
	 continue;

      // Set any version providing the .deb as the candidate.
      for (auto Prv = P.ProvidesList(); Prv.end() == false; Prv++)
      {
	 if (I.release.empty())
	    Cache.GetDepCache()->SetCandidateVersion(Prv.OwnerVer());
	 else
	    Cache.GetDepCache()->SetCandidateRelease(Prv.OwnerVer(), I.release);
      }

      // via cacheset to have our usual virtual handling
      APT::VersionContainerInterface::FromPackage(&(verset[MOD_INSTALL]), Cache, P, APT::CacheSetHelper::CANDIDATE, helper);
   }

   UnknownPackages = helper.notFound;

   if (_error->PendingError() == true)
   {
      helper.showVirtualPackageErrors(Cache);
      return false;
   }


  TryToInstall InstallAction(Cache, Fix.get(), BrokenFix);
  TryToRemove RemoveAction(Cache, Fix.get());
  APT::PackageSet UpgradablePackages;
  bool const distUpgradeMode = strcmp(CmdL.FileList[0], "dist-upgrade") == 0 || strcmp(CmdL.FileList[0], "full-upgrade") == 0;

  {
     unsigned short const order[] = {MOD_REMOVE, MOD_INSTALL, 0};

     for (unsigned short i = 0; order[i] != 0; ++i)
     {
	if (order[i] == MOD_INSTALL)
	   InstallAction = std::for_each(verset[MOD_INSTALL].begin(), verset[MOD_INSTALL].end(), InstallAction);
	else if (order[i] == MOD_REMOVE)
	   RemoveAction = std::for_each(verset[MOD_REMOVE].begin(), verset[MOD_REMOVE].end(), RemoveAction);
     }

     {
	APT::CacheSetHelper helper;
	helper.PackageFrom(APT::CacheSetHelper::PATTERN, &UpgradablePackages, Cache, "?upgradable");
     }

     // Record the state before we call the solver.
     pkgDepCache::Transaction transaction(Cache, pkgDepCache::Transaction::Behavior::COMMIT);
     auto runTheSolver = [&](std::ostream &out) -> bool
     {
	if (Fix != NULL && _config->FindB("APT::Get::AutoSolving", true) == true)
	{
	   InstallAction.propagateReleaseCandidateSwitching(helper.selectedByRelease, c0out);
	   InstallAction.doAutoInstall();
	}

	if (_error->PendingError() == true)
	{
	   return false;
	}

	/* If we are in the Broken fixing mode we do not attempt to fix the
	   problems. This is if the user invoked install without -f and gave
	   packages */
	if (BrokenFix == true && Cache->BrokenCount() != 0)
	{
	   out << _("You might want to run 'apt --fix-broken install' to correct these.") << std::endl;
	   ShowBroken(out, Cache, false);
	   return _error->Error(_("Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution)."));
	}

	if (Fix != NULL)
	{
	   // Call the scored problem resolver
	   OpTextProgress Progress(*_config);

	   if (distUpgradeMode && _config->Find("Binary") == "apt")
	      _config->CndSet("APT::Get::AutomaticRemove::Kernels", _config->FindB("APT::Get::AutomaticRemove", true));

	   bool resolver_fail = false;
	   if (distUpgradeMode == true || UpgradeMode != APT::Upgrade::ALLOW_EVERYTHING)
	      resolver_fail = APT::Upgrade::Upgrade(Cache, UpgradeMode, &Progress);
	   else
	      resolver_fail = Fix->Resolve(true, &Progress);

	   if (resolver_fail == false && Cache->BrokenCount() == 0)
	      return false;
	}

	if (CheckNothingBroken(out, Cache) == false)
	   return false;

	return true;
     };

     std::ostringstream out;
     _error->PushToStack();
     auto res = runTheSolver(out);

     // 3.0 solver is a bit more strict and applies the rules to user provided arguments as well, so if you provide
     // a removal request, but don't allow removals, it fails; or if you install something conflicting with an installed
     // package during an `upgrade` run, that's the same problem. So if an upgrade restriction is set and we have
     // arguments specified, don't try solver3.
     auto invalidCombinations = UpgradeMode && (not verset[MOD_REMOVE].empty() || not verset[MOD_INSTALL].empty());
     // Fallback to 3.0 if we don't get a result or apport is installed
     if (not invalidCombinations && _config->Find("APT::Solver", "internal") == "internal" && (not res || (not Cache->FindPkg("apport").end() && Cache->FindPkg("apport")->CurrentVer)))
     {
	bool isUpgrade = distUpgradeMode || UpgradeMode != APT::Upgrade::ALLOW_EVERYTHING;
	auto internalBroken = Cache->BrokenCount();
	auto internalDel = Cache->DelCount();
	auto internalInst = Cache->InstCount();
	auto internalUpgrade = Cache->UpgradeCount();

	// Create a nested transaction. When leaving this scope, we are back to the 'internal' result.
	pkgDepCache::Transaction solver3(Cache, pkgDepCache::Transaction::Behavior::ROLLBACK);
	transaction.temporaryRollback(); // Rollback to before internal solver made changes

	std::vector<std::string> errors;
	_error->PushToStack();
	_config->Set("APT::Solver", "3.0");
	_config->CndSet("APT::Solver::RemoveManual", "true"); // otherwise we are always "worse"
	std::ofstream solver3out;			      // empty out stream...
	bool solver3Res = runTheSolver(solver3out);

	std::string str;
	while (not _error->empty())
	   if (_error->PopMessage(str))
	      errors.push_back(str);
	_config->Set("APT::Solver", "internal");
	_error->RevertToStack();

	// Cost factors to compare two solutions
	auto solver3Cost = std::make_tuple(Cache->DelCount(), isUpgrade  ? -Cache->UpgradeCount() : 0, Cache->InstCount() - Cache->UpgradeCount(), Cache->UpgradeCount());
	auto internalCost = std::make_tuple(internalDel, isUpgrade ? -internalUpgrade : 0, internalInst - internalUpgrade, internalUpgrade);

	// An error summary for apport.
	std::string error;
	if (solver3Res && Cache->BrokenCount())
	{
	   error = "Internal error: The 3.0 solver produced a broken cache";
	}
	else if (not solver3Res || Cache->BrokenCount() || not errors.empty())
	{
	   if (res && not internalBroken)
	      error = "Failure: The 3.0 solver did not find a result";
	}
	else if (not res)
	{
	   // Commit the changes from the 3.0 solver. This in turn commits the 3.0 transaction into the internal
	   // transaction which sounds a bit awkward, but that's the way it goes: commit() is just delete the
	   // transaction stage so it can't rollback.
	   _error->Discard();
	   _error->Audit(_("Result calculated by the 3.0 solver."));
	   solver3.commit();
	   res = true;
	}
	else if (solver3Cost > internalCost)
	{
	   error = "Failure: The 3.0 solver produced a worse result";
	}

	if (res && not error.empty() && not Cache->FindPkg("apport").end() && Cache->FindPkg("apport")->CurrentVer)
	{
	   pkgDepCache::Transaction dumpTransaction(Cache, pkgDepCache::Transaction::Behavior::ROLLBACK);
	   transaction.temporaryRollback(); // Rollback to before internal solver made changes so we can dump the OG request
	   WriteApportReport(Cache, error, errors, UpgradeMode, distUpgradeMode);
	}

	if (not res && not errors.empty() && not _config->FindB("quiet::NoSolver3Explanation", false))
	   _error->Error("The following information from --solver 3.0 may provide additional context:\n%s", APT::String::Join(errors, "\n").c_str());
     }
     // If the 3.0 solver could not recover either, abort.
     _error->MergeWithStack();
     if (not res)
     {
	c1out << out.str() << std::flush;
	return false;
     }
  }
  if (!DoAutomaticRemove(Cache))
     return false;

  // if nothing changed in the cache, but only the automark information
  // we write the StateFile here, otherwise it will be written in
  // cache.commit()
  if (InstallAction.AutoMarkChanged > 0 &&
      Cache->DelCount() == 0 && Cache->InstCount() == 0 &&
      Cache->BadCount() == 0 &&
      _config->FindB("APT::Get::Simulate", false) == false)
     Cache->writeStateFile(NULL);

  SortedPackageUniverse Universe(Cache);
  for (auto const &Pkg : Universe)
     if (Pkg->CurrentVer != 0 && not Cache[Pkg].Upgrade() && not Cache[Pkg].Delete() &&
	 UpgradablePackages.find(Pkg) != UpgradablePackages.end())
	HeldBackPackages.push_back(Pkg);

  return true;
}
									/*}}}*/
bool AddVolatileSourceFile(pkgSourceList *const SL, PseudoPkg &&pkg, std::vector<PseudoPkg> &VolatileCmdL)/*{{{*/
{
   auto const ext = flExtension(pkg.name);
   if (ext != "dsc" && FileExists(pkg.name + "/debian/control") == false)
      return false;
   std::vector<std::string> files;
   SL->AddVolatileFile(pkg.name, &files);
   std::transform(files.begin(), files.end(), std::back_inserter(VolatileCmdL), [&](auto &&f) { return PseudoPkg{std::move(f), pkg.arch, pkg.release, pkg.index}; });
   return true;

}
									/*}}}*/
bool AddVolatileBinaryFile(pkgSourceList *const SL, PseudoPkg &&pkg, std::vector<PseudoPkg> &VolatileCmdL)/*{{{*/
{
   auto const ext = flExtension(pkg.name);
   if (ext != "deb" && ext != "ddeb" && ext != "changes")
      return false;
   std::vector<std::string> files;
   SL->AddVolatileFile(pkg.name, &files);
   std::transform(files.begin(), files.end(), std::back_inserter(VolatileCmdL), [&](auto &&f) { return PseudoPkg{std::move(f), pkg.arch, pkg.release, pkg.index}; });
   return true;
}
									/*}}}*/
static bool AddIfVolatile(pkgSourceList *const SL, std::vector<PseudoPkg> &VolatileCmdL, bool (*Add)(pkgSourceList *const, PseudoPkg &&, std::vector<PseudoPkg> &), char const * const I, std::string const &pseudoArch)/*{{{*/
{
   if (I != nullptr && (I[0] == '/' || (I[0] == '.' && (I[1] == '\0' || (I[1] == '.' && (I[2] == '\0' || I[2] == '/')) || I[1] == '/'))))
   {
      PseudoPkg pkg(I, pseudoArch, "", SL->GetVolatileFiles().size());
      if (FileExists(I)) // this accepts directories and symlinks, too
      {
	 if (Add(SL, std::move(pkg), VolatileCmdL))
	    ;
	 else
	    _error->Error(_("Unsupported file %s given on commandline"), I);
	 return true;
      }
      else
      {
	 auto const found = pkg.name.rfind("/");
	 if (found == pkg.name.find("/"))
	    _error->Error(_("Unsupported file %s given on commandline"), I);
	 else
	 {
	    pkg.release = pkg.name.substr(found + 1);
	    pkg.name.erase(found);
	    if (Add(SL, std::move(pkg), VolatileCmdL))
	       ;
	    else
	       _error->Error(_("Unsupported file %s given on commandline"), I);
	 }
	 return true;
      }
   }
   return false;
}
									/*}}}*/
std::vector<PseudoPkg> GetAllPackagesAsPseudo(pkgSourceList *const SL, CommandLine &CmdL, bool (*Add)(pkgSourceList *const, PseudoPkg &&, std::vector<PseudoPkg> &), std::string const &pseudoArch)/*{{{*/
{
   std::vector<PseudoPkg> PkgCmdL;
   std::for_each(CmdL.FileList + 1, CmdL.FileList + CmdL.FileSize(), [&](char const *const I) {
      if (AddIfVolatile(SL, PkgCmdL, Add, I, pseudoArch) == false)
	 PkgCmdL.emplace_back(I, pseudoArch, "", -1);
   });
   return PkgCmdL;
}
									/*}}}*/
std::vector<PseudoPkg> GetPseudoPackages(pkgSourceList *const SL, CommandLine &CmdL, bool (*Add)(pkgSourceList *const, PseudoPkg &&, std::vector<PseudoPkg> &), std::string const &pseudoArch)/*{{{*/
{
   std::vector<PseudoPkg> VolatileCmdL;
   (void)std::remove_if(CmdL.FileList + 1, CmdL.FileList + 1 + CmdL.FileSize(), [&](char const *const I) {
      return AddIfVolatile(SL, VolatileCmdL, Add, I, pseudoArch);
   });
   return VolatileCmdL;
}
									/*}}}*/
// DoInstall - Install packages from the command line			/*{{{*/
// ---------------------------------------------------------------------
/* Install named packages */
struct PkgIsExtraInstalled {
   pkgCacheFile * const Cache;
   APT::VersionVector const * const verset;
   PkgIsExtraInstalled(pkgCacheFile * const Cache, APT::VersionVector const * const Container) : Cache(Cache), verset(Container) {}
   bool operator() (pkgCache::PkgIterator const &Pkg)
   {
        if ((*Cache)[Pkg].Install() == false)
           return false;
        pkgCache::VerIterator const Cand = (*Cache)[Pkg].CandidateVerIter(*Cache);
	return std::find(verset->begin(), verset->end(), Cand) == verset->end();
   }
};
/* Print out a list of suggested and recommended packages */
static void ShowWeakDependencies(CacheFile &Cache)
{
   std::list<std::string> Recommends, Suggests, SingleRecommends, SingleSuggests;
   SortedPackageUniverse Universe(Cache);
   for (auto const &Pkg: Universe)
   {
      /* Just look at the ones we want to install */
      if ((*Cache)[Pkg].NewInstall() == false)
	continue;

      // get the recommends/suggests for the candidate ver
      pkgCache::VerIterator CV = (*Cache)[Pkg].CandidateVerIter(*Cache);
      for (pkgCache::DepIterator D = CV.DependsList(); D.end() == false; )
      {
	 pkgCache::DepIterator Start;
	 pkgCache::DepIterator End;
	 D.GlobOr(Start,End); // advances D
	 if (Start->Type != pkgCache::Dep::Recommends && Start->Type != pkgCache::Dep::Suggests)
	    continue;

	 {
	    // Skip if we already saw this
	    std::string target;
	    for (pkgCache::DepIterator I = Start; I != D; ++I)
	    {
	       if (target.empty() == false)
		  target.append(" | ");
	       target.append(I.TargetPkg().FullName(true));
	    }
	    std::list<std::string> &Type = Start->Type == pkgCache::Dep::Recommends ? SingleRecommends : SingleSuggests;
	    if (std::find(Type.begin(), Type.end(), target) != Type.end())
	       continue;
	    Type.push_back(target);
	 }

	 std::list<std::string> OrList;
	 bool foundInstalledInOrGroup = false;
	 for (pkgCache::DepIterator I = Start; I != D; ++I)
	 {
	    {
	       // satisfying package is installed and not marked for deletion
	       APT::VersionList installed = APT::VersionList::FromDependency(Cache, I, APT::CacheSetHelper::INSTALLED);
	       if (std::find_if(installed.begin(), installed.end(),
			[&Cache](pkgCache::VerIterator const &Ver) { return Cache[Ver.ParentPkg()].Delete() == false; }) != installed.end())
	       {
		  foundInstalledInOrGroup = true;
		  break;
	       }
	    }

	    {
	       // satisfying package is upgraded to/new install
	       APT::VersionList upgrades = APT::VersionList::FromDependency(Cache, I, APT::CacheSetHelper::CANDIDATE);
	       if (std::find_if(upgrades.begin(), upgrades.end(),
			[&Cache](pkgCache::VerIterator const &Ver) { return Cache[Ver.ParentPkg()].Upgrade(); }) != upgrades.end())
	       {
		  foundInstalledInOrGroup = true;
		  break;
	       }
	    }

	    if (OrList.empty())
	       OrList.push_back(I.TargetPkg().FullName(true));
	    else
	       OrList.push_back("| " + I.TargetPkg().FullName(true));
	 }

	 if(foundInstalledInOrGroup == false)
	 {
	    std::list<std::string> &Type = Start->Type == pkgCache::Dep::Recommends ? Recommends : Suggests;
	    std::move(OrList.begin(), OrList.end(), std::back_inserter(Type));
	 }
      }
   }
   auto always_true = [](std::string const&) { return true; };
   auto string_ident = [](std::string const&str) { return str; };
   auto verbose_show_candidate =
      [&Cache](std::string str)
      {
	 if (APT::String::Startswith(str, "| "))
	    str.erase(0, 2);
	 pkgCache::PkgIterator const Pkg = Cache->FindPkg(str);
	 if (Pkg.end() == true)
	    return "";
	 return (*Cache)[Pkg].CandVersion;
      };
   ShowList(c1out,_("Suggested packages:"), Suggests,
	 always_true, string_ident, verbose_show_candidate);
   ShowList(c1out,_("Recommended packages:"), Recommends,
	 always_true, string_ident, verbose_show_candidate);
}

bool DoInstall(CommandLine &CmdL)
{
   CacheFile Cache;

   if (_config->FindB("APT::Update") && not DoUpdate())
      return false;

   Cache.InhibitActionGroups(true);
   if (Cache.BuildSourceList() == false)
      return false;
   auto VolatileCmdL = GetPseudoPackages(Cache.GetSourceList(), CmdL, AddVolatileBinaryFile, "");

   // then open the cache
   if (Cache.OpenForInstall() == false || 
       Cache.CheckDeps(CmdL.FileSize() != 1) == false)
      return false;

   std::map<unsigned short, APT::VersionVector> verset;
   std::set<std::string> UnknownPackages;
   APT::PackageVector HeldBackPackages;

   if (not DoCacheManipulationFromCommandLine(CmdL, VolatileCmdL, Cache, verset, 0, UnknownPackages, HeldBackPackages))
   {
      RunJsonHook("AptCli::Hooks::Install", "org.debian.apt.hooks.install.fail", CmdL.FileList, Cache, UnknownPackages);
      return false;
   }

   /* Print out a list of packages that are going to be installed extra
      to what the user asked */
   SortedPackageUniverse Universe(Cache);
   if (_config->FindI("APT::Output-Version") < 30 && Cache->InstCount() != verset[MOD_INSTALL].size())
      ShowList(c1out, _("The following additional packages will be installed:"), Universe,
	    PkgIsExtraInstalled(&Cache, &verset[MOD_INSTALL]),
	    &PrettyFullName, CandidateVersion(&Cache), "action::install-dependencies");

   /* Print out a list of suggested and recommended packages */
   if (_config->FindI("APT::Output-Version") < 30)
      ShowWeakDependencies(Cache);

   RunJsonHook("AptCli::Hooks::Install", "org.debian.apt.hooks.install.pre-prompt", CmdL.FileList, Cache);

   bool result;
   // See if we need to prompt
   // FIXME: check if really the packages in the set are going to be installed
   if (Cache->InstCount() == verset[MOD_INSTALL].size() && Cache->DelCount() == 0)
      result = InstallPackages(Cache, HeldBackPackages, false, false, true, "AptCli::Hooks::Install", CmdL);
   else
      result = InstallPackages(Cache, HeldBackPackages, false, true, true, "AptCli::Hooks::Install", CmdL);

   if (result)
      result = RunJsonHook("AptCli::Hooks::Install", "org.debian.apt.hooks.install.post", CmdL.FileList, Cache);
   else
      /* not a result */ RunJsonHook("AptCli::Hooks::Install", "org.debian.apt.hooks.install.fail", CmdL.FileList, Cache);

   return result;
}
									/*}}}*/

// TryToInstall - Mark a package for installation			/*{{{*/
void TryToInstall::operator() (pkgCache::VerIterator const &Ver) {
   if (unlikely(Ver.end()))
   {
      _error->Fatal("The given version to TryToInstall is invalid!");
      return;
   }
   pkgCache::PkgIterator Pkg = Ver.ParentPkg();
   if (unlikely(Pkg.end()))
   {
      _error->Fatal("The given version to TryToInstall has an invalid parent package!");
      return;
   }

   Cache->GetDepCache()->SetCandidateVersion(Ver);
   pkgDepCache::StateCache &State = (*Cache)[Pkg];

   // Handle the no-upgrade case
   if (_config->FindB("APT::Get::upgrade",true) == false && Pkg->CurrentVer != 0)
      ioprintf(c1out,_("Skipping %s, it is already installed and upgrade is not set.\n"),
	    Pkg.FullName(true).c_str());
   // Ignore request for install if package would be new
   else if (_config->FindB("APT::Get::Only-Upgrade", false) == true && Pkg->CurrentVer == 0)
      ioprintf(c1out,_("Skipping %s, it is not installed and only upgrades are requested.\n"),
	    Pkg.FullName(true).c_str());
   else {
      if (Fix != NULL) {
	 Fix->Clear(Pkg);
	 Fix->Protect(Pkg);
      }
      Cache->GetDepCache()->MarkInstall(Pkg,false);

      if (State.Install() == false) {
	 if (_config->FindB("APT::Get::ReInstall",false) == true) {
	    if (Pkg->CurrentVer == 0 || Pkg.CurrentVer().Downloadable() == false)
	       ioprintf(c1out,_("Reinstallation of %s is not possible, it cannot be downloaded.\n"),
		     Pkg.FullName(true).c_str());
	    else
	       Cache->GetDepCache()->SetReInstall(Pkg, true);
	 } else
	    // TRANSLATORS: First string is package name, second is version
	    ioprintf(c1out,_("%s is already the newest version (%s).\n"),
		  Pkg.FullName(true).c_str(), Pkg.CurrentVer().VerStr());
      }

      // Install it with autoinstalling enabled (if we not respect the minial
      // required deps or the policy)
      if (FixBroken == false)
	 doAutoInstallLater.insert(Pkg);
   }

   // see if we need to fix the auto-mark flag
   // e.g. apt-get install foo
   // where foo is marked automatic
   if (State.Install() == false &&
	 (State.Flags & pkgCache::Flag::Auto) &&
	 _config->FindB("APT::Get::ReInstall",false) == false &&
	 _config->FindB("APT::Get::Only-Upgrade",false) == false &&
	 _config->FindB("APT::Get::Download-Only",false) == false)
   {
      ioprintf(c1out,_("%s set to manually installed.\n"),
	    Pkg.FullName(true).c_str());
      Cache->GetDepCache()->MarkAuto(Pkg,false);
      AutoMarkChanged++;
   }
}
									/*}}}*/
bool TryToInstall::propagateReleaseCandidateSwitching(std::list<std::pair<pkgCache::VerIterator, std::string> > const &start, std::ostream &out)/*{{{*/
{
   for (std::list<std::pair<pkgCache::VerIterator, std::string> >::const_iterator s = start.begin();
	 s != start.end(); ++s)
      Cache->GetDepCache()->SetCandidateVersion(s->first);

   bool Success = true;
   // the Changed list contains:
   //   first: "new version"
   //   second: "what-caused the change"
   std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> > Changed;
   for (std::list<std::pair<pkgCache::VerIterator, std::string> >::const_iterator s = start.begin();
	 s != start.end(); ++s)
   {
      Changed.push_back(std::make_pair(s->first, pkgCache::VerIterator(*Cache)));
      // We continue here even if it failed to enhance the ShowBroken output
      Success &= Cache->GetDepCache()->SetCandidateRelease(s->first, s->second, Changed);
   }
   for (std::list<std::pair<pkgCache::VerIterator, pkgCache::VerIterator> >::const_iterator c = Changed.begin();
	 c != Changed.end(); ++c)
   {
      if (c->second.end() == true)
      {
	 auto const pkgname = c->first.ParentPkg().FullName(true);
	 if (APT::String::Startswith(pkgname, "builddeps:"))
	    continue;
	 ioprintf(out, _("Selected version '%s' (%s) for '%s'\n"),
	       c->first.VerStr(), c->first.RelStr().c_str(), pkgname.c_str());
      }
      else if (c->first.ParentPkg()->Group != c->second.ParentPkg()->Group)
      {
	 auto pkgname = c->second.ParentPkg().FullName(true);
	 if (APT::String::Startswith(pkgname, "builddeps:"))
	    pkgname.replace(0, strlen("builddeps"), "src");
	 pkgCache::VerIterator V = (*Cache)[c->first.ParentPkg()].CandidateVerIter(*Cache);
	 ioprintf(out, _("Selected version '%s' (%s) for '%s' because of '%s'\n"), V.VerStr(),
	       V.RelStr().c_str(), V.ParentPkg().FullName(true).c_str(), pkgname.c_str());
      }
   }
   return Success;
}
									/*}}}*/
void TryToInstall::doAutoInstall() {					/*{{{*/
   auto * const DCache = Cache->GetDepCache();
   for (auto const &P: doAutoInstallLater)
      DCache->MarkInstall(P, true);
   doAutoInstallLater.clear();
}
									/*}}}*/
// TryToRemove - Mark a package for removal				/*{{{*/
void TryToRemove::operator() (pkgCache::VerIterator const &Ver)
{
   pkgCache::PkgIterator Pkg = Ver.ParentPkg();

   if (Fix != NULL)
   {
      Fix->Clear(Pkg);
      Fix->Protect(Pkg);
      Fix->Remove(Pkg);
   }

   if ((Pkg->CurrentVer == 0 && PurgePkgs == false) ||
	 (PurgePkgs == true && Pkg->CurrentState == pkgCache::State::NotInstalled))
   {
      pkgCache::GrpIterator Grp = Pkg.Group();
      pkgCache::PkgIterator P = Grp.PackageList();
      for (; P.end() != true; P = Grp.NextPkg(P))
      {
	 if (P == Pkg)
	    continue;
	 if (P->CurrentVer != 0 || (PurgePkgs == true && P->CurrentState != pkgCache::State::NotInstalled))
	 {
	    // TRANSLATORS: Note, this is not an interactive question
	    ioprintf(c1out,_("Package '%s' is not installed, so not removed. Did you mean '%s'?\n"),
		  Pkg.FullName(true).c_str(), P.FullName(true).c_str());
	    break;
	 }
      }
      if (P.end() == true)
	 ioprintf(c1out,_("Package '%s' is not installed, so not removed\n"),Pkg.FullName(true).c_str());

      // MarkInstall refuses to install packages on hold
      Pkg->SelectedState = pkgCache::State::Hold;
   }
   else
      Cache->GetDepCache()->MarkDelete(Pkg, PurgePkgs);
}
									/*}}}*/