* apt-pkg/deb/dpkgpm.cc:

[apt.git] / apt-pkg / deb / dpkgpm.cc

// -*- mode: cpp; mode: fold -*-
// Description                                                          /*{{{*/
// $Id: dpkgpm.cc,v 1.28 2004/01/27 02:25:01 mdz Exp $
/* ######################################################################

   DPKG Package Manager - Provide an interface to dpkg
   
   ##################################################################### */
                                                                        /*}}}*/
// Includes                                                             /*{{{*/
#include <config.h>

#include <apt-pkg/cachefile.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/depcache.h>
#include <apt-pkg/dpkgpm.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/install-progress.h>
#include <apt-pkg/packagemanager.h>
#include <apt-pkg/pkgrecords.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/cacheiterators.h>
#include <apt-pkg/macros.h>
#include <apt-pkg/pkgcache.h>

#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pty.h>
#include <pwd.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <algorithm>
#include <cstring>
#include <iostream>
#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include <apti18n.h>
                                                                        /*}}}*/

using namespace std;

class pkgDPkgPMPrivate 
{
public:
   pkgDPkgPMPrivate() : stdin_is_dev_null(false), dpkgbuf_pos(0),
                        term_out(NULL), history_out(NULL), 
                        progress(NULL), master(-1), slave(-1)
   {
      dpkgbuf[0] = '\0';
   }
   ~pkgDPkgPMPrivate()
   {
   }
   bool stdin_is_dev_null;
   // the buffer we use for the dpkg status-fd reading
   char dpkgbuf[1024];
   int dpkgbuf_pos;
   FILE *term_out;
   FILE *history_out;
   string dpkg_error;
   APT::Progress::PackageManager *progress;

   // pty stuff
   struct       termios tt;
   int master;
   int slave;

   // signals
   sigset_t sigmask;
   sigset_t original_sigmask;

};

namespace
{
  // Maps the dpkg "processing" info to human readable names.  Entry 0
  // of each array is the key, entry 1 is the value.
  const std::pair<const char *, const char *> PackageProcessingOps[] = {
    std::make_pair("install",   N_("Installing %s")),
    std::make_pair("configure", N_("Configuring %s")),
    std::make_pair("remove",    N_("Removing %s")),
    std::make_pair("purge",    N_("Completely removing %s")),
    std::make_pair("disappear", N_("Noting disappearance of %s")),
    std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  };

  const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);

  // Predicate to test whether an entry in the PackageProcessingOps
  // array matches a string.
  class MatchProcessingOp
  {
    const char *target;

  public:
    MatchProcessingOp(const char *the_target)
      : target(the_target)
    {
    }

    bool operator()(const std::pair<const char *, const char *> &pair) const
    {
      return strcmp(pair.first, target) == 0;
    }
  };
}

/* helper function to ionice the given PID 

 there is no C header for ionice yet - just the syscall interface
 so we use the binary from util-linux
*/
static bool
ionice(int PID)
{
   if (!FileExists("/usr/bin/ionice"))
      return false;
   pid_t Process = ExecFork();
   if (Process == 0)
   {
      char buf[32];
      snprintf(buf, sizeof(buf), "-p%d", PID);
      const char *Args[4];
      Args[0] = "/usr/bin/ionice";
      Args[1] = "-c3";
      Args[2] = buf;
      Args[3] = 0;
      execv(Args[0], (char **)Args);
   }
   return ExecWait(Process, "ionice");
}

static std::string getDpkgExecutable()
{
   string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
   string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
   size_t dpkgChrootLen = dpkgChrootDir.length();
   if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0)
   {
      if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
         --dpkgChrootLen;
      Tmp = Tmp.substr(dpkgChrootLen);
   }
   return Tmp;
}

// dpkgChrootDirectory - chrooting for dpkg if needed                   /*{{{*/
static void dpkgChrootDirectory()
{
   std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
   if (chrootDir == "/")
      return;
   std::cerr << "Chrooting into " << chrootDir << std::endl;
   if (chroot(chrootDir.c_str()) != 0)
      _exit(100);
   if (chdir("/") != 0)
      _exit(100);
}
                                                                        /*}}}*/


// FindNowVersion - Helper to find a Version in "now" state     /*{{{*/
// ---------------------------------------------------------------------
/* This is helpful when a package is no longer installed but has residual 
 * config files
 */
static 
pkgCache::VerIterator FindNowVersion(const pkgCache::PkgIterator &Pkg)
{
   pkgCache::VerIterator Ver;
   for (Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
   {
      pkgCache::VerFileIterator Vf = Ver.FileList();
      pkgCache::PkgFileIterator F = Vf.File();
      for (F = Vf.File(); F.end() == false; ++F)
      {
         if (F && F.Archive())
         {
            if (strcmp(F.Archive(), "now")) 
               return Ver;
         }
      }
   }
   return Ver;
}
                                                                        /*}}}*/

// DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
// ---------------------------------------------------------------------
/* */
pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache) 
   : pkgPackageManager(Cache), pkgFailures(0), PackagesDone(0), PackagesTotal(0)
{
   d = new pkgDPkgPMPrivate();
}
                                                                        /*}}}*/
// DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
// ---------------------------------------------------------------------
/* */
pkgDPkgPM::~pkgDPkgPM()
{
   delete d;
}
                                                                        /*}}}*/
// DPkgPM::Install - Install a package                                  /*{{{*/
// ---------------------------------------------------------------------
/* Add an install operation to the sequence list */
bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
{
   if (File.empty() == true || Pkg.end() == true)
      return _error->Error("Internal Error, No file name for %s",Pkg.FullName().c_str());

   // If the filename string begins with DPkg::Chroot-Directory, return the
   // substr that is within the chroot so dpkg can access it.
   string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
   if (chrootdir != "/" && File.find(chrootdir) == 0)
   {
      size_t len = chrootdir.length();
      if (chrootdir.at(len - 1) == '/')
        len--;
      List.push_back(Item(Item::Install,Pkg,File.substr(len)));
   }
   else
      List.push_back(Item(Item::Install,Pkg,File));

   return true;
}
                                                                        /*}}}*/
// DPkgPM::Configure - Configure a package                              /*{{{*/
// ---------------------------------------------------------------------
/* Add a configure operation to the sequence list */
bool pkgDPkgPM::Configure(PkgIterator Pkg)
{
   if (Pkg.end() == true)
      return false;

   List.push_back(Item(Item::Configure, Pkg));

   // Use triggers for config calls if we configure "smart"
   // as otherwise Pre-Depends will not be satisfied, see #526774
   if (_config->FindB("DPkg::TriggersPending", false) == true)
      List.push_back(Item(Item::TriggersPending, PkgIterator()));

   return true;
}
                                                                        /*}}}*/
// DPkgPM::Remove - Remove a package                                    /*{{{*/
// ---------------------------------------------------------------------
/* Add a remove operation to the sequence list */
bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
{
   if (Pkg.end() == true)
      return false;
   
   if (Purge == true)
      List.push_back(Item(Item::Purge,Pkg));
   else
      List.push_back(Item(Item::Remove,Pkg));
   return true;
}
                                                                        /*}}}*/
// DPkgPM::SendPkgInfo - Send info for install-pkgs hook                /*{{{*/
// ---------------------------------------------------------------------
/* This is part of the helper script communication interface, it sends
   very complete information down to the other end of the pipe.*/
bool pkgDPkgPM::SendV2Pkgs(FILE *F)
{
   return SendPkgsInfo(F, 2);
}
bool pkgDPkgPM::SendPkgsInfo(FILE * const F, unsigned int const &Version)
{
   // This version of APT supports only v3, so don't sent higher versions
   if (Version <= 3)
      fprintf(F,"VERSION %u\n", Version);
   else
      fprintf(F,"VERSION 3\n");

   /* Write out all of the configuration directives by walking the
      configuration tree */
   const Configuration::Item *Top = _config->Tree(0);
   for (; Top != 0;)
   {
      if (Top->Value.empty() == false)
      {
         fprintf(F,"%s=%s\n",
                 QuoteString(Top->FullTag(),"=\"\n").c_str(),
                 QuoteString(Top->Value,"\n").c_str());
      }

      if (Top->Child != 0)
      {
         Top = Top->Child;
         continue;
      }
      
      while (Top != 0 && Top->Next == 0)
         Top = Top->Parent;
      if (Top != 0)
         Top = Top->Next;
   }   
   fprintf(F,"\n");
 
   // Write out the package actions in order.
   for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
   {
      if(I->Pkg.end() == true)
         continue;

      pkgDepCache::StateCache &S = Cache[I->Pkg];
      
      fprintf(F,"%s ",I->Pkg.Name());

      // Current version which we are going to replace
      pkgCache::VerIterator CurVer = I->Pkg.CurrentVer();
      if (CurVer.end() == true && (I->Op == Item::Remove || I->Op == Item::Purge))
         CurVer = FindNowVersion(I->Pkg);

      if (CurVer.end() == true)
      {
         if (Version <= 2)
            fprintf(F, "- ");
         else
            fprintf(F, "- - none ");
      }
      else
      {
         fprintf(F, "%s ", CurVer.VerStr());
         if (Version >= 3)
            fprintf(F, "%s %s ", CurVer.Arch(), CurVer.MultiArchType());
      }

      // Show the compare operator between current and install version
      if (S.InstallVer != 0)
      {
         pkgCache::VerIterator const InstVer = S.InstVerIter(Cache);
         int Comp = 2;
         if (CurVer.end() == false)
            Comp = InstVer.CompareVer(CurVer);
         if (Comp < 0)
            fprintf(F,"> ");
         else if (Comp == 0)
            fprintf(F,"= ");
         else if (Comp > 0)
            fprintf(F,"< ");
         fprintf(F, "%s ", InstVer.VerStr());
         if (Version >= 3)
            fprintf(F, "%s %s ", InstVer.Arch(), InstVer.MultiArchType());
      }
      else
      {
         if (Version <= 2)
            fprintf(F, "> - ");
         else
            fprintf(F, "> - - none ");
      }

      // Show the filename/operation
      if (I->Op == Item::Install)
      {
         // No errors here..
         if (I->File[0] != '/')
            fprintf(F,"**ERROR**\n");
         else
            fprintf(F,"%s\n",I->File.c_str());
      }      
      else if (I->Op == Item::Configure)
         fprintf(F,"**CONFIGURE**\n");
      else if (I->Op == Item::Remove ||
          I->Op == Item::Purge)
         fprintf(F,"**REMOVE**\n");
      
      if (ferror(F) != 0)
         return false;
   }
   return true;
}
                                                                        /*}}}*/
// DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
// ---------------------------------------------------------------------
/* This looks for a list of scripts to run from the configuration file
   each one is run and is fed on standard input a list of all .deb files
   that are due to be installed. */
bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
{
   bool result = true;

   Configuration::Item const *Opts = _config->Tree(Cnf);
   if (Opts == 0 || Opts->Child == 0)
      return true;
   Opts = Opts->Child;

   sighandler_t old_sigpipe = signal(SIGPIPE, SIG_IGN);
   
   unsigned int Count = 1;
   for (; Opts != 0; Opts = Opts->Next, Count++)
   {
      if (Opts->Value.empty() == true)
         continue;

      if(_config->FindB("Debug::RunScripts", false) == true)
         std::clog << "Running external script with list of all .deb file: '"
                   << Opts->Value << "'" << std::endl;

      // Determine the protocol version
      string OptSec = Opts->Value;
      string::size_type Pos;
      if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
         Pos = OptSec.length();
      OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
      
      unsigned int Version = _config->FindI(OptSec+"::Version",1);
      unsigned int InfoFD = _config->FindI(OptSec + "::InfoFD", STDIN_FILENO);
      
      // Create the pipes
      std::set<int> KeepFDs;
      MergeKeepFdsFromConfiguration(KeepFDs);
      int Pipes[2];
      if (pipe(Pipes) != 0) {
         result = _error->Errno("pipe","Failed to create IPC pipe to subprocess");
         break;
      }
      if (InfoFD != (unsigned)Pipes[0])
         SetCloseExec(Pipes[0],true);
      else
         KeepFDs.insert(Pipes[0]);


      SetCloseExec(Pipes[1],true);

      // Purified Fork for running the script
      pid_t Process = ExecFork(KeepFDs);
      if (Process == 0)
      {
         // Setup the FDs
         dup2(Pipes[0], InfoFD);
         SetCloseExec(STDOUT_FILENO,false);
         SetCloseExec(STDIN_FILENO,false);
         SetCloseExec(STDERR_FILENO,false);

         string hookfd;
         strprintf(hookfd, "%d", InfoFD);
         setenv("APT_HOOK_INFO_FD", hookfd.c_str(), 1);

         dpkgChrootDirectory();
         const char *Args[4];
         Args[0] = "/bin/sh";
         Args[1] = "-c";
         Args[2] = Opts->Value.c_str();
         Args[3] = 0;
         execv(Args[0],(char **)Args);
         _exit(100);
      }
      close(Pipes[0]);
      FILE *F = fdopen(Pipes[1],"w");
      if (F == 0) {
         result = _error->Errno("fdopen","Faild to open new FD");
         break;
      }
      
      // Feed it the filenames.
      if (Version <= 1)
      {
         for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
         {
            // Only deal with packages to be installed from .deb
            if (I->Op != Item::Install)
               continue;

            // No errors here..
            if (I->File[0] != '/')
               continue;
            
            /* Feed the filename of each package that is pending install
               into the pipe. */
            fprintf(F,"%s\n",I->File.c_str());
            if (ferror(F) != 0)
               break;
         }
      }
      else
         SendPkgsInfo(F, Version);

      fclose(F);
      
      // Clean up the sub process
      if (ExecWait(Process,Opts->Value.c_str()) == false) {
         result = _error->Error("Failure running script %s",Opts->Value.c_str());
         break;
      }
   }
   signal(SIGPIPE, old_sigpipe);

   return result;
}
                                                                        /*}}}*/
// DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
// ---------------------------------------------------------------------
/*
*/
void pkgDPkgPM::DoStdin(int master)
{
   unsigned char input_buf[256] = {0,}; 
   ssize_t len = read(0, input_buf, sizeof(input_buf));
   if (len)
      FileFd::Write(master, input_buf, len);
   else
      d->stdin_is_dev_null = true;
}
                                                                        /*}}}*/
// DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
// ---------------------------------------------------------------------
/*
 * read the terminal pty and write log
 */
void pkgDPkgPM::DoTerminalPty(int master)
{
   unsigned char term_buf[1024] = {0,0, };

   ssize_t len=read(master, term_buf, sizeof(term_buf));
   if(len == -1 && errno == EIO)
   {
      // this happens when the child is about to exit, we
      // give it time to actually exit, otherwise we run
      // into a race so we sleep for half a second.
      struct timespec sleepfor = { 0, 500000000 };
      nanosleep(&sleepfor, NULL);
      return;
   }  
   if(len <= 0) 
      return;
   FileFd::Write(1, term_buf, len);
   if(d->term_out)
      fwrite(term_buf, len, sizeof(char), d->term_out);
}
                                                                        /*}}}*/
// DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
// ---------------------------------------------------------------------
/*
 */
void pkgDPkgPM::ProcessDpkgStatusLine(char *line)
{
   bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
   if (Debug == true)
      std::clog << "got from dpkg '" << line << "'" << std::endl;

   /* dpkg sends strings like this:
      'status:   <pkg>: <pkg  qstate>'
      'status:   <pkg>:<arch>: <pkg  qstate>'
      
      'processing: {install,configure,remove,purge,disappear,trigproc}: pkg'
      'processing: {install,configure,remove,purge,disappear,trigproc}: trigger'
   */

   // we need to split on ": " (note the appended space) as the ':' is
   // part of the pkgname:arch information that dpkg sends
   // 
   // A dpkg error message may contain additional ":" (like
   //  "failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb ..."
   // so we need to ensure to not split too much
   std::vector<std::string> list = StringSplit(line, ": ", 4);
   if(list.size() < 3)
   {
      if (Debug == true)
         std::clog << "ignoring line: not enough ':'" << std::endl;
      return;
   }

   // build the (prefix, pkgname, action) tuple, position of this
   // is different for "processing" or "status" messages
   std::string prefix = APT::String::Strip(list[0]);
   std::string pkgname;
   std::string action;

   // "processing" has the form "processing: action: pkg or trigger"
   // with action = ["install", "configure", "remove", "purge", "disappear",
   //                "trigproc"]
   if (prefix == "processing")
   {
      pkgname = APT::String::Strip(list[2]);
      action = APT::String::Strip(list[1]);
   }
   // "status" has the form: "status: pkg: state"
   // with state in ["half-installed", "unpacked", "half-configured", 
   //                "installed", "config-files", "not-installed"]
   else if (prefix == "status")
   {
      pkgname = APT::String::Strip(list[1]);
      action = APT::String::Strip(list[2]);
   } else {
      if (Debug == true)
         std::clog << "unknown prefix '" << prefix << "'" << std::endl;
      return;
   }


   /* handle the special cases first:

      errors look like this:
      'status: /var/cache/apt/archives/krecipes_0.8.1-0ubuntu1_i386.deb : error : trying to overwrite `/usr/share/doc/kde/HTML/en/krecipes/krectip.png', which is also in package krecipes-data 
      and conffile-prompt like this
      'status:/etc/compiz.conf/compiz.conf :  conffile-prompt: 'current-conffile' 'new-conffile' useredited distedited
   */
   if (prefix == "status")
   {
      if(action == "error")
      {
         d->progress->Error(pkgname, PackagesDone, PackagesTotal,
                            list[3]);
         pkgFailures++;
         WriteApportReport(pkgname.c_str(), list[3].c_str());
         return;
      }
      else if(action == "conffile-prompt")
      {
         d->progress->ConffilePrompt(pkgname, PackagesDone, PackagesTotal,
                                     list[3]);
         return;
      }
   }

   // at this point we know that we should have a valid pkgname, so build all 
   // the info from it

   // dpkg does not send always send "pkgname:arch" so we add it here 
   // if needed
   if (pkgname.find(":") == std::string::npos)
   {
      // find the package in the group that is in a touched by dpkg
      // if there are multiple dpkg will send us a full pkgname:arch
      pkgCache::GrpIterator Grp = Cache.FindGrp(pkgname);
      if (Grp.end() == false) 
      {
          pkgCache::PkgIterator P = Grp.PackageList();
          for (; P.end() != true; P = Grp.NextPkg(P))
          {
              if(Cache[P].Mode != pkgDepCache::ModeKeep)
              {
                  pkgname = P.FullName();
                  break;
              }
          }
      }
   }
   
   const char* const pkg = pkgname.c_str();
   std::string short_pkgname = StringSplit(pkgname, ":")[0];
   std::string arch = "";
   if (pkgname.find(":") != string::npos)
      arch = StringSplit(pkgname, ":")[1];
   std::string i18n_pkgname = pkgname;
   if (arch.size() != 0)
      strprintf(i18n_pkgname, "%s (%s)", short_pkgname.c_str(), arch.c_str());

   // 'processing' from dpkg looks like
   // 'processing: action: pkg'
   if(prefix == "processing")
   {
      const std::pair<const char *, const char *> * const iter =
        std::find_if(PackageProcessingOpsBegin,
                     PackageProcessingOpsEnd,
                     MatchProcessingOp(action.c_str()));
      if(iter == PackageProcessingOpsEnd)
      {
         if (Debug == true)
            std::clog << "ignoring unknown action: " << action << std::endl;
         return;
      }
      std::string msg;
      strprintf(msg, _(iter->second), i18n_pkgname.c_str());
      d->progress->StatusChanged(pkgname, PackagesDone, PackagesTotal, msg);

      // FIXME: this needs a muliarch testcase
      // FIXME2: is "pkgname" here reliable with dpkg only sending us 
      //         short pkgnames?
      if (action == "disappear")
         handleDisappearAction(pkgname);
      return;
   } 

   if (prefix == "status")
   {
      vector<struct DpkgState> const &states = PackageOps[pkg];
      const char *next_action = NULL;
      if(PackageOpsDone[pkg] < states.size())
         next_action = states[PackageOpsDone[pkg]].state;
      // check if the package moved to the next dpkg state
      if(next_action && (action == next_action))
      {
         // only read the translation if there is actually a next
         // action
         const char *translation = _(states[PackageOpsDone[pkg]].str);
         std::string msg;

         // we moved from one dpkg state to a new one, report that
         PackageOpsDone[pkg]++;
         PackagesDone++;

         strprintf(msg, translation, i18n_pkgname.c_str());
         d->progress->StatusChanged(pkgname, PackagesDone, PackagesTotal, msg);
         
      }
      if (Debug == true) 
         std::clog << "(parsed from dpkg) pkg: " << short_pkgname
                   << " action: " << action << endl;
   }
}
                                                                        /*}}}*/
// DPkgPM::handleDisappearAction                                        /*{{{*/
void pkgDPkgPM::handleDisappearAction(string const &pkgname)
{
   pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
   if (unlikely(Pkg.end() == true))
      return;

   // record the package name for display and stuff later
   disappearedPkgs.insert(Pkg.FullName(true));

   // the disappeared package was auto-installed - nothing to do
   if ((Cache[Pkg].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
      return;
   pkgCache::VerIterator PkgVer = Cache[Pkg].InstVerIter(Cache);
   if (unlikely(PkgVer.end() == true))
      return;
   /* search in the list of dependencies for (Pre)Depends,
      check if this dependency has a Replaces on our package
      and if so transfer the manual installed flag to it */
   for (pkgCache::DepIterator Dep = PkgVer.DependsList(); Dep.end() != true; ++Dep)
   {
      if (Dep->Type != pkgCache::Dep::Depends &&
          Dep->Type != pkgCache::Dep::PreDepends)
         continue;
      pkgCache::PkgIterator Tar = Dep.TargetPkg();
      if (unlikely(Tar.end() == true))
         continue;
      // the package is already marked as manual
      if ((Cache[Tar].Flags & pkgCache::Flag::Auto) != pkgCache::Flag::Auto)
         continue;
      pkgCache::VerIterator TarVer =  Cache[Tar].InstVerIter(Cache);
      if (TarVer.end() == true)
         continue;
      for (pkgCache::DepIterator Rep = TarVer.DependsList(); Rep.end() != true; ++Rep)
      {
         if (Rep->Type != pkgCache::Dep::Replaces)
            continue;
         if (Pkg != Rep.TargetPkg())
            continue;
         // okay, they are strongly connected - transfer manual-bit
         if (Debug == true)
            std::clog << "transfer manual-bit from disappeared »" << pkgname << "« to »" << Tar.FullName() << "«" << std::endl;
         Cache[Tar].Flags &= ~Flag::Auto;
         break;
      }
   }
}
                                                                        /*}}}*/
// DPkgPM::DoDpkgStatusFd                                               /*{{{*/
// ---------------------------------------------------------------------
/*
 */
void pkgDPkgPM::DoDpkgStatusFd(int statusfd)
{
   char *p, *q;
   int len;

   len=read(statusfd, &d->dpkgbuf[d->dpkgbuf_pos], sizeof(d->dpkgbuf)-d->dpkgbuf_pos);
   d->dpkgbuf_pos += len;
   if(len <= 0)
      return;

   // process line by line if we have a buffer
   p = q = d->dpkgbuf;
   while((q=(char*)memchr(p, '\n', d->dpkgbuf+d->dpkgbuf_pos-p)) != NULL)
   {
      *q = 0;
      ProcessDpkgStatusLine(p);
      p=q+1; // continue with next line
   }

   // now move the unprocessed bits (after the final \n that is now a 0x0) 
   // to the start and update d->dpkgbuf_pos
   p = (char*)memrchr(d->dpkgbuf, 0, d->dpkgbuf_pos);
   if(p == NULL)
      return;

   // we are interessted in the first char *after* 0x0
   p++;

   // move the unprocessed tail to the start and update pos
   memmove(d->dpkgbuf, p, p-d->dpkgbuf);
   d->dpkgbuf_pos = d->dpkgbuf+d->dpkgbuf_pos-p;
}
                                                                        /*}}}*/
// DPkgPM::WriteHistoryTag                                              /*{{{*/
void pkgDPkgPM::WriteHistoryTag(string const &tag, string value)
{
   size_t const length = value.length();
   if (length == 0)
      return;
   // poor mans rstrip(", ")
   if (value[length-2] == ',' && value[length-1] == ' ')
      value.erase(length - 2, 2);
   fprintf(d->history_out, "%s: %s\n", tag.c_str(), value.c_str());
}                                                                       /*}}}*/
// DPkgPM::OpenLog                                                      /*{{{*/
bool pkgDPkgPM::OpenLog()
{
   string const logdir = _config->FindDir("Dir::Log");
   if(CreateAPTDirectoryIfNeeded(logdir, logdir) == false)
      // FIXME: use a better string after freeze
      return _error->Error(_("Directory '%s' missing"), logdir.c_str());

   // get current time
   char timestr[200];
   time_t const t = time(NULL);
   struct tm const * const tmp = localtime(&t);
   strftime(timestr, sizeof(timestr), "%F  %T", tmp);

   // open terminal log
   string const logfile_name = flCombine(logdir,
                                   _config->Find("Dir::Log::Terminal"));
   if (!logfile_name.empty())
   {
      d->term_out = fopen(logfile_name.c_str(),"a");
      if (d->term_out == NULL)
         return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
      setvbuf(d->term_out, NULL, _IONBF, 0);
      SetCloseExec(fileno(d->term_out), true);
      if (getuid() == 0) // if we aren't root, we can't chown a file, so don't try it
      {
         struct passwd *pw = getpwnam("root");
         struct group *gr = getgrnam("adm");
         if (pw != NULL && gr != NULL && chown(logfile_name.c_str(), pw->pw_uid, gr->gr_gid) != 0)
            _error->WarningE("OpenLog", "chown to root:adm of file %s failed", logfile_name.c_str());
      }
      if (chmod(logfile_name.c_str(), 0640) != 0)
         _error->WarningE("OpenLog", "chmod 0640 of file %s failed", logfile_name.c_str());
      fprintf(d->term_out, "\nLog started: %s\n", timestr);
   }

   // write your history
   string const history_name = flCombine(logdir,
                                   _config->Find("Dir::Log::History"));
   if (!history_name.empty())
   {
      d->history_out = fopen(history_name.c_str(),"a");
      if (d->history_out == NULL)
         return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
      SetCloseExec(fileno(d->history_out), true);
      chmod(history_name.c_str(), 0644);
      fprintf(d->history_out, "\nStart-Date: %s\n", timestr);
      string remove, purge, install, reinstall, upgrade, downgrade;
      for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
      {
         enum { CANDIDATE, CANDIDATE_AUTO, CURRENT_CANDIDATE, CURRENT } infostring;
         string *line = NULL;
         #define HISTORYINFO(X, Y) { line = &X; infostring = Y; }
         if (Cache[I].NewInstall() == true)
            HISTORYINFO(install, CANDIDATE_AUTO)
         else if (Cache[I].ReInstall() == true)
            HISTORYINFO(reinstall, CANDIDATE)
         else if (Cache[I].Upgrade() == true)
            HISTORYINFO(upgrade, CURRENT_CANDIDATE)
         else if (Cache[I].Downgrade() == true)
            HISTORYINFO(downgrade, CURRENT_CANDIDATE)
         else if (Cache[I].Delete() == true)
            HISTORYINFO((Cache[I].Purge() ? purge : remove), CURRENT)
         else
            continue;
         #undef HISTORYINFO
         line->append(I.FullName(false)).append(" (");
         switch (infostring) {
         case CANDIDATE: line->append(Cache[I].CandVersion); break;
         case CANDIDATE_AUTO:
            line->append(Cache[I].CandVersion);
            if ((Cache[I].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
               line->append(", automatic");
            break;
         case CURRENT_CANDIDATE: line->append(Cache[I].CurVersion).append(", ").append(Cache[I].CandVersion); break;
         case CURRENT: line->append(Cache[I].CurVersion); break;
         }
         line->append("), ");
      }
      if (_config->Exists("Commandline::AsString") == true)
         WriteHistoryTag("Commandline", _config->Find("Commandline::AsString"));
      WriteHistoryTag("Install", install);
      WriteHistoryTag("Reinstall", reinstall);
      WriteHistoryTag("Upgrade", upgrade);
      WriteHistoryTag("Downgrade",downgrade);
      WriteHistoryTag("Remove",remove);
      WriteHistoryTag("Purge",purge);
      fflush(d->history_out);
   }
   
   return true;
}
                                                                        /*}}}*/
// DPkg::CloseLog                                                       /*{{{*/
bool pkgDPkgPM::CloseLog()
{
   char timestr[200];
   time_t t = time(NULL);
   struct tm *tmp = localtime(&t);
   strftime(timestr, sizeof(timestr), "%F  %T", tmp);

   if(d->term_out)
   {
      fprintf(d->term_out, "Log ended: ");
      fprintf(d->term_out, "%s", timestr);
      fprintf(d->term_out, "\n");
      fclose(d->term_out);
   }
   d->term_out = NULL;

   if(d->history_out)
   {
      if (disappearedPkgs.empty() == false)
      {
         string disappear;
         for (std::set<std::string>::const_iterator d = disappearedPkgs.begin();
              d != disappearedPkgs.end(); ++d)
         {
            pkgCache::PkgIterator P = Cache.FindPkg(*d);
            disappear.append(*d);
            if (P.end() == true)
               disappear.append(", ");
            else
               disappear.append(" (").append(Cache[P].CurVersion).append("), ");
         }
         WriteHistoryTag("Disappeared", disappear);
      }
      if (d->dpkg_error.empty() == false)
         fprintf(d->history_out, "Error: %s\n", d->dpkg_error.c_str());
      fprintf(d->history_out, "End-Date: %s\n", timestr);
      fclose(d->history_out);
   }
   d->history_out = NULL;

   return true;
}
                                                                        /*}}}*/
                                                                        /*}}}*/
/*{{{*/
// This implements a racy version of pselect for those architectures
// that don't have a working implementation.
// FIXME: Probably can be removed on Lenny+1
static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
   fd_set *exceptfds, const struct timespec *timeout,
   const sigset_t *sigmask)
{
   sigset_t origmask;
   struct timeval tv;
   int retval;

   tv.tv_sec = timeout->tv_sec;
   tv.tv_usec = timeout->tv_nsec/1000;

   sigprocmask(SIG_SETMASK, sigmask, &origmask);
   retval = select(nfds, readfds, writefds, exceptfds, &tv);
   sigprocmask(SIG_SETMASK, &origmask, 0);
   return retval;
}
                                                                        /*}}}*/

// DPkgPM::BuildPackagesProgressMap                                     /*{{{*/
void pkgDPkgPM::BuildPackagesProgressMap()
{
   // map the dpkg states to the operations that are performed
   // (this is sorted in the same way as Item::Ops)
   static const struct DpkgState DpkgStatesOpMap[][7] = {
      // Install operation
      { 
         {"half-installed", N_("Preparing %s")}, 
         {"unpacked", N_("Unpacking %s") }, 
         {NULL, NULL}
      },
      // Configure operation
      { 
         {"unpacked",N_("Preparing to configure %s") },
         {"half-configured", N_("Configuring %s") },
         { "installed", N_("Installed %s")},
         {NULL, NULL}
      },
      // Remove operation
      { 
         {"half-configured", N_("Preparing for removal of %s")},
         {"half-installed", N_("Removing %s")},
         {"config-files",  N_("Removed %s")},
         {NULL, NULL}
      },
      // Purge operation
      { 
         {"config-files", N_("Preparing to completely remove %s")},
         {"not-installed", N_("Completely removed %s")},
         {NULL, NULL}
      },
   };

   // init the PackageOps map, go over the list of packages that
   // that will be [installed|configured|removed|purged] and add
   // them to the PackageOps map (the dpkg states it goes through)
   // and the PackageOpsTranslations (human readable strings)
   for (vector<Item>::const_iterator I = List.begin(); I != List.end(); ++I)
   {
      if((*I).Pkg.end() == true)
         continue;

      string const name = (*I).Pkg.FullName();
      PackageOpsDone[name] = 0;
      for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL; ++i)
      {
         PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
         PackagesTotal++;
      }
   }
}
                                                                        /*}}}*/
#if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR < 13)
bool pkgDPkgPM::Go(int StatusFd)
{
   APT::Progress::PackageManager *progress = NULL;
   if (StatusFd == -1)
      progress = APT::Progress::PackageManagerProgressFactory();
   else
      progress = new APT::Progress::PackageManagerProgressFd(StatusFd);
   
   return GoNoABIBreak(progress);
}
#endif

void pkgDPkgPM::StartPtyMagic()
{
   if (_config->FindB("Dpkg::Use-Pty", true) == false)
   {
      d->master = d->slave = -1;
      return;
   }

   // setup the pty and stuff
   struct winsize win;

   // if tcgetattr for both stdin/stdout returns 0 (no error)
   // we do the pty magic
   _error->PushToStack();
   if (tcgetattr(STDIN_FILENO, &d->tt) == 0 &&
       tcgetattr(STDOUT_FILENO, &d->tt) == 0)
   {
       if (ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) < 0)
       {
           _error->Errno("ioctl", _("ioctl(TIOCGWINSZ) failed"));
       } else if (openpty(&d->master, &d->slave, NULL, &d->tt, &win) < 0)
       {
           _error->Errno("openpty", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
           d->master = d->slave = -1;
        } else {
            struct termios rtt;
            rtt = d->tt;
            cfmakeraw(&rtt);
            rtt.c_lflag &= ~ECHO;
            rtt.c_lflag |= ISIG;
            // block SIGTTOU during tcsetattr to prevent a hang if
            // the process is a member of the background process group
            // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
            sigemptyset(&d->sigmask);
            sigaddset(&d->sigmask, SIGTTOU);
            sigprocmask(SIG_BLOCK,&d->sigmask, &d->original_sigmask);
            tcsetattr(0, TCSAFLUSH, &rtt);
            sigprocmask(SIG_SETMASK, &d->original_sigmask, 0);
        }
      }
   // complain only if stdout is either a terminal (but still failed) or is an invalid
      // descriptor otherwise we would complain about redirection to e.g. /dev/null as well.
      else if (isatty(STDOUT_FILENO) == 1 || errno == EBADF)
         _error->Errno("tcgetattr", _("Can not write log (%s)"), _("Is stdout a terminal?"));

      if (_error->PendingError() == true)
         _error->DumpErrors(std::cerr);
      _error->RevertToStack();
}

void pkgDPkgPM::StopPtyMagic()
{
   if(d->slave > 0)
      close(d->slave);
   if(d->master >= 0) 
   {
      tcsetattr(0, TCSAFLUSH, &d->tt);
      close(d->master);
   }
}

// DPkgPM::Go - Run the sequence                                        /*{{{*/
// ---------------------------------------------------------------------
/* This globs the operations and calls dpkg 
 *
 * If it is called with a progress object apt will report the install
 * progress to this object. It maps the dpkg states a package goes
 * through to human readable (and i10n-able)
 * names and calculates a percentage for each step.
 */
#if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR >= 13)
bool pkgDPkgPM::Go(APT::Progress::PackageManager *progress)
#else
bool pkgDPkgPM::GoNoABIBreak(APT::Progress::PackageManager *progress)
#endif
{
   pkgPackageManager::SigINTStop = false;
   d->progress = progress;

   // Generate the base argument list for dpkg
   unsigned long StartSize = 0;
   std::vector<const char *> Args;
   std::string DpkgExecutable = getDpkgExecutable();
   Args.push_back(DpkgExecutable.c_str());
   StartSize += DpkgExecutable.length();

   // Stick in any custom dpkg options
   Configuration::Item const *Opts = _config->Tree("DPkg::Options");
   if (Opts != 0)
   {
      Opts = Opts->Child;
      for (; Opts != 0; Opts = Opts->Next)
      {
         if (Opts->Value.empty() == true)
            continue;
         Args.push_back(Opts->Value.c_str());
         StartSize += Opts->Value.length();
      }
   }

   size_t const BaseArgs = Args.size();
   // we need to detect if we can qualify packages with the architecture or not
   Args.push_back("--assert-multi-arch");
   Args.push_back(NULL);

   pid_t dpkgAssertMultiArch = ExecFork();
   if (dpkgAssertMultiArch == 0)
   {
      dpkgChrootDirectory();
      // redirect everything to the ultimate sink as we only need the exit-status
      int const nullfd = open("/dev/null", O_RDONLY);
      dup2(nullfd, STDIN_FILENO);
      dup2(nullfd, STDOUT_FILENO);
      dup2(nullfd, STDERR_FILENO);
      execvp(Args[0], (char**) &Args[0]);
      _error->WarningE("dpkgGo", "Can't detect if dpkg supports multi-arch!");
      _exit(2);
   }

   fd_set rfds;
   struct timespec tv;

   unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
   unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
   bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);

   if (RunScripts("DPkg::Pre-Invoke") == false)
      return false;

   if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
      return false;

   // support subpressing of triggers processing for special
   // cases like d-i that runs the triggers handling manually
   bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
   bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
   if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
      List.push_back(Item(Item::ConfigurePending, PkgIterator()));

   // for the progress
   BuildPackagesProgressMap();

   d->stdin_is_dev_null = false;

   // create log
   OpenLog();

   bool dpkgMultiArch = false;
   if (dpkgAssertMultiArch > 0)
   {
      int Status = 0;
      while (waitpid(dpkgAssertMultiArch, &Status, 0) != dpkgAssertMultiArch)
      {
         if (errno == EINTR)
            continue;
         _error->WarningE("dpkgGo", _("Waited for %s but it wasn't there"), "dpkg --assert-multi-arch");
         break;
      }
      if (WIFEXITED(Status) == true && WEXITSTATUS(Status) == 0)
         dpkgMultiArch = true;
   }

   // start pty magic before the loop
   StartPtyMagic();

   // Tell the progress that its starting and fork dpkg 
   d->progress->Start(d->master);

   // this loop is runs once per dpkg operation
   vector<Item>::const_iterator I = List.begin();
   while (I != List.end())
   {
      // Do all actions with the same Op in one run
      vector<Item>::const_iterator J = I;
      if (TriggersPending == true)
         for (; J != List.end(); ++J)
         {
            if (J->Op == I->Op)
               continue;
            if (J->Op != Item::TriggersPending)
               break;
            vector<Item>::const_iterator T = J + 1;
            if (T != List.end() && T->Op == I->Op)
               continue;
            break;
         }
      else
         for (; J != List.end() && J->Op == I->Op; ++J)
            /* nothing */;

      // keep track of allocated strings for multiarch package names
      std::vector<char *> Packages;

      // start with the baseset of arguments
      unsigned long Size = StartSize;
      Args.erase(Args.begin() + BaseArgs, Args.end());

      // Now check if we are within the MaxArgs limit
      //
      // this code below is problematic, because it may happen that
      // the argument list is split in a way that A depends on B
      // and they are in the same "--configure A B" run
      // - with the split they may now be configured in different
      //   runs, using Immediate-Configure-All can help prevent this.
      if (J - I > (signed)MaxArgs)
      {
         J = I + MaxArgs;
         unsigned long const size = MaxArgs + 10;
         Args.reserve(size);
         Packages.reserve(size);
      }
      else
      {
         unsigned long const size = (J - I) + 10;
         Args.reserve(size);
         Packages.reserve(size);
      }

      int fd[2];
      if (pipe(fd) != 0)
         return _error->Errno("pipe","Failed to create IPC pipe to dpkg");

#define ADDARG(X) Args.push_back(X); Size += strlen(X)
#define ADDARGC(X) Args.push_back(X); Size += sizeof(X) - 1

      ADDARGC("--status-fd");
      char status_fd_buf[20];
      snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
      ADDARG(status_fd_buf);
      unsigned long const Op = I->Op;

      switch (I->Op)
      {
         case Item::Remove:
         ADDARGC("--force-depends");
         ADDARGC("--force-remove-essential");
         ADDARGC("--remove");
         break;
         
         case Item::Purge:
         ADDARGC("--force-depends");
         ADDARGC("--force-remove-essential");
         ADDARGC("--purge");
         break;
         
         case Item::Configure:
         ADDARGC("--configure");
         break;

         case Item::ConfigurePending:
         ADDARGC("--configure");
         ADDARGC("--pending");
         break;

         case Item::TriggersPending:
         ADDARGC("--triggers-only");
         ADDARGC("--pending");
         break;

         case Item::Install:
         ADDARGC("--unpack");
         ADDARGC("--auto-deconfigure");
         break;
      }

      if (NoTriggers == true && I->Op != Item::TriggersPending &&
          I->Op != Item::ConfigurePending)
      {
         ADDARGC("--no-triggers");
      }
#undef ADDARGC

      // Write in the file or package names
      if (I->Op == Item::Install)
      {
         for (;I != J && Size < MaxArgBytes; ++I)
         {
            if (I->File[0] != '/')
               return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
            Args.push_back(I->File.c_str());
            Size += I->File.length();
         }
      }
      else
      {
         string const nativeArch = _config->Find("APT::Architecture");
         unsigned long const oldSize = I->Op == Item::Configure ? Size : 0;
         for (;I != J && Size < MaxArgBytes; ++I)
         {
            if((*I).Pkg.end() == true)
               continue;
            if (I->Op == Item::Configure && disappearedPkgs.find(I->Pkg.FullName(true)) != disappearedPkgs.end())
               continue;
            // We keep this here to allow "smooth" transitions from e.g. multiarch dpkg/ubuntu to dpkg/debian
            if (dpkgMultiArch == false && (I->Pkg.Arch() == nativeArch ||
                                           strcmp(I->Pkg.Arch(), "all") == 0 ||
                                           strcmp(I->Pkg.Arch(), "none") == 0))
            {
               char const * const name = I->Pkg.Name();
               ADDARG(name);
            }
            else
            {
               pkgCache::VerIterator PkgVer;
               std::string name = I->Pkg.Name();
               if (Op == Item::Remove || Op == Item::Purge) 
               {
                  PkgVer = I->Pkg.CurrentVer();
                  if(PkgVer.end() == true)
                     PkgVer = FindNowVersion(I->Pkg);
               }
               else
                  PkgVer = Cache[I->Pkg].InstVerIter(Cache);
               if (strcmp(I->Pkg.Arch(), "none") == 0)
                  ; // never arch-qualify a package without an arch
               else if (PkgVer.end() == false)
                  name.append(":").append(PkgVer.Arch());
               else
                  _error->Warning("Can not find PkgVer for '%s'", name.c_str());
               char * const fullname = strdup(name.c_str());
               Packages.push_back(fullname);
               ADDARG(fullname);
            }
         }
         // skip configure action if all sheduled packages disappeared
         if (oldSize == Size)
            continue;
      }
#undef ADDARG

      J = I;
      
      if (_config->FindB("Debug::pkgDPkgPM",false) == true)
      {
         for (std::vector<const char *>::const_iterator a = Args.begin();
              a != Args.end(); ++a)
            clog << *a << ' ';
         clog << endl;
         continue;
      }
      Args.push_back(NULL);

      cout << flush;
      clog << flush;
      cerr << flush;

      /* Mask off sig int/quit. We do this because dpkg also does when 
         it forks scripts. What happens is that when you hit ctrl-c it sends
         it to all processes in the group. Since dpkg ignores the signal 
         it doesn't die but we do! So we must also ignore it */
      sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
      sighandler_t old_SIGINT = signal(SIGINT,SigINT);
      
      // Check here for any SIGINT
      if (pkgPackageManager::SigINTStop && (Op == Item::Remove || Op == Item::Purge || Op == Item::Install)) 
         break;
      
      
      // ignore SIGHUP as well (debian #463030)
      sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);

      // now run dpkg
      d->progress->StartDpkg();
      std::set<int> KeepFDs;
      KeepFDs.insert(fd[1]);
      MergeKeepFdsFromConfiguration(KeepFDs);
      pid_t Child = ExecFork(KeepFDs);
      if (Child == 0)
      {
         // This is the child
         if(d->slave >= 0 && d->master >= 0) 
         {
            setsid();
            int res = ioctl(d->slave, TIOCSCTTY, 0);
            if (res < 0) {
               std::cerr << "ioctl(TIOCSCTTY) failed for fd: " 
                         << d->slave << std::endl;
            } else {
               close(d->master);
               dup2(d->slave, 0);
               dup2(d->slave, 1);
               dup2(d->slave, 2);
               close(d->slave);
            }
         }
         close(fd[0]); // close the read end of the pipe

         dpkgChrootDirectory();

         if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
            _exit(100);

         if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
         {
            int Flags;
            int dummy = 0;
            if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
               _exit(100);
            
            // Discard everything in stdin before forking dpkg
            if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
               _exit(100);
            
            while (read(STDIN_FILENO,&dummy,1) == 1);
            
            if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
               _exit(100);
         }

         /* No Job Control Stop Env is a magic dpkg var that prevents it
            from using sigstop */
         putenv((char *)"DPKG_NO_TSTP=yes");
         execvp(Args[0], (char**) &Args[0]);
         cerr << "Could not exec dpkg!" << endl;
         _exit(100);
      }      

      // apply ionice
      if (_config->FindB("DPkg::UseIoNice", false) == true)
         ionice(Child);

      // Wait for dpkg
      int Status = 0;

      // we read from dpkg here
      int const _dpkgin = fd[0];
      close(fd[1]);                        // close the write end of the pipe

      // setups fds
      sigemptyset(&d->sigmask);
      sigprocmask(SIG_BLOCK,&d->sigmask,&d->original_sigmask);

      /* free vectors (and therefore memory) as we don't need the included data anymore */
      for (std::vector<char *>::const_iterator p = Packages.begin();
           p != Packages.end(); ++p)
         free(*p);
      Packages.clear();

      // the result of the waitpid call
      int res;
      int select_ret;
      while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
         if(res < 0) {
            // FIXME: move this to a function or something, looks ugly here
            // error handling, waitpid returned -1
            if (errno == EINTR)
               continue;
            RunScripts("DPkg::Post-Invoke");

            // Restore sig int/quit
            signal(SIGQUIT,old_SIGQUIT);
            signal(SIGINT,old_SIGINT);

            signal(SIGHUP,old_SIGHUP);
            return _error->Errno("waitpid","Couldn't wait for subprocess");
         }

         // wait for input or output here
         FD_ZERO(&rfds);
         if (d->master >= 0 && !d->stdin_is_dev_null)
            FD_SET(0, &rfds); 
         FD_SET(_dpkgin, &rfds);
         if(d->master >= 0)
            FD_SET(d->master, &rfds);
         tv.tv_sec = 0;
         tv.tv_nsec = d->progress->GetPulseInterval();
         select_ret = pselect(max(d->master, _dpkgin)+1, &rfds, NULL, NULL, 
                              &tv, &d->original_sigmask);
         if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
            select_ret = racy_pselect(max(d->master, _dpkgin)+1, &rfds, NULL,
                                      NULL, &tv, &d->original_sigmask);
         d->progress->Pulse();
         if (select_ret == 0) 
            continue;
         else if (select_ret < 0 && errno == EINTR)
            continue;
         else if (select_ret < 0) 
         {
            perror("select() returned error");
            continue;
         } 
         
         if(d->master >= 0 && FD_ISSET(d->master, &rfds))
            DoTerminalPty(d->master);
         if(d->master >= 0 && FD_ISSET(0, &rfds))
            DoStdin(d->master);
         if(FD_ISSET(_dpkgin, &rfds))
            DoDpkgStatusFd(_dpkgin);
      }
      close(_dpkgin);

      // Restore sig int/quit
      signal(SIGQUIT,old_SIGQUIT);
      signal(SIGINT,old_SIGINT);
      
      signal(SIGHUP,old_SIGHUP);
      // Check for an error code.
      if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
      {
         // if it was set to "keep-dpkg-runing" then we won't return
         // here but keep the loop going and just report it as a error
         // for later
         bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);

         if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
            strprintf(d->dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
         else if (WIFEXITED(Status) != 0)
            strprintf(d->dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
         else
            strprintf(d->dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
         _error->Error("%s", d->dpkg_error.c_str());

         if(stopOnError)
            break;
      }
   }
   // dpkg is done at this point
   d->progress->Stop();
   StopPtyMagic();
   CloseLog();

   if (pkgPackageManager::SigINTStop)
       _error->Warning(_("Operation was interrupted before it could finish"));

   if (RunScripts("DPkg::Post-Invoke") == false)
      return false;

   if (_config->FindB("Debug::pkgDPkgPM",false) == false)
   {
      std::string const oldpkgcache = _config->FindFile("Dir::cache::pkgcache");
      if (oldpkgcache.empty() == false && RealFileExists(oldpkgcache) == true &&
          unlink(oldpkgcache.c_str()) == 0)
      {
         std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache");
         if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true)
         {
            _error->PushToStack();
            pkgCacheFile CacheFile;
            CacheFile.BuildCaches(NULL, true);
            _error->RevertToStack();
         }
      }
   }

   Cache.writeStateFile(NULL);
   return d->dpkg_error.empty();
}

void SigINT(int /*sig*/) {
   pkgPackageManager::SigINTStop = true;
}
                                                                        /*}}}*/
// pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgDPkgPM::Reset() 
{
   List.erase(List.begin(),List.end());
}
                                                                        /*}}}*/
// pkgDpkgPM::WriteApportReport - write out error report pkg failure    /*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgDPkgPM::WriteApportReport(const char *pkgpath, const char *errormsg) 
{
   // If apport doesn't exist or isn't installed do nothing
   // This e.g. prevents messages in 'universes' without apport
   pkgCache::PkgIterator apportPkg = Cache.FindPkg("apport");
   if (apportPkg.end() == true || apportPkg->CurrentVer == 0)
      return;

   string pkgname, reportfile, srcpkgname, pkgver, arch;
   string::size_type pos;
   FILE *report;

   if (_config->FindB("Dpkg::ApportFailureReport", true) == false)
   {
      std::clog << "configured to not write apport reports" << std::endl;
      return;
   }

   // only report the first errors
   if(pkgFailures > _config->FindI("APT::Apport::MaxReports", 3))
   {
      std::clog << _("No apport report written because MaxReports is reached already") << std::endl;
      return;
   }

   // check if its not a follow up error 
   const char *needle = dgettext("dpkg", "dependency problems - leaving unconfigured");
   if(strstr(errormsg, needle) != NULL) {
      std::clog << _("No apport report written because the error message indicates its a followup error from a previous failure.") << std::endl;
      return;
   }

   // do not report disk-full failures 
   if(strstr(errormsg, strerror(ENOSPC)) != NULL) {
      std::clog << _("No apport report written because the error message indicates a disk full error") << std::endl;
      return;
   }

   // do not report out-of-memory failures 
   if(strstr(errormsg, strerror(ENOMEM)) != NULL ||
      strstr(errormsg, "failed to allocate memory") != NULL) {
      std::clog << _("No apport report written because the error message indicates a out of memory error") << std::endl;
      return;
   }

   // do not report bugs regarding inaccessible local files
   if(strstr(errormsg, strerror(ENOENT)) != NULL ||
      strstr(errormsg, "cannot access archive") != NULL) {
      std::clog << _("No apport report written because the error message indicates an issue on the local system") << std::endl;
      return;
   }

   // do not report errors encountered when decompressing packages
   if(strstr(errormsg, "--fsys-tarfile returned error exit status 2") != NULL) {
      std::clog << _("No apport report written because the error message indicates an issue on the local system") << std::endl;
      return;
   }

   // do not report dpkg I/O errors, this is a format string, so we compare
   // the prefix and the suffix of the error with the dpkg error message
   vector<string> io_errors;
   io_errors.push_back(string("failed to read"));
   io_errors.push_back(string("failed to write"));
   io_errors.push_back(string("failed to seek"));
   io_errors.push_back(string("unexpected end of file or stream"));

   for (vector<string>::iterator I = io_errors.begin(); I != io_errors.end(); ++I)
   {
      vector<string> list = VectorizeString(dgettext("dpkg", (*I).c_str()), '%');
      if (list.size() > 1) {
         // we need to split %s, VectorizeString only allows char so we need
         // to kill the "s" manually
         if (list[1].size() > 1) {
            list[1].erase(0, 1);
            if(strstr(errormsg, list[0].c_str()) && 
               strstr(errormsg, list[1].c_str())) {
               std::clog << _("No apport report written because the error message indicates a dpkg I/O error") << std::endl;
               return;
            }
         }
      }
   }

   // get the pkgname and reportfile
   pkgname = flNotDir(pkgpath);
   pos = pkgname.find('_');
   if(pos != string::npos)
      pkgname = pkgname.substr(0, pos);

   // find the package versin and source package name
   pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
   if (Pkg.end() == true)
      return;
   pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);
   if (Ver.end() == true)
      return;
   pkgver = Ver.VerStr() == NULL ? "unknown" : Ver.VerStr();
   pkgRecords Recs(Cache);
   pkgRecords::Parser &Parse = Recs.Lookup(Ver.FileList());
   srcpkgname = Parse.SourcePkg();
   if(srcpkgname.empty())
      srcpkgname = pkgname;

   // if the file exists already, we check:
   // - if it was reported already (touched by apport). 
   //   If not, we do nothing, otherwise
   //    we overwrite it. This is the same behaviour as apport
   // - if we have a report with the same pkgversion already
   //   then we skip it
   reportfile = flCombine("/var/crash",pkgname+".0.crash");
   if(FileExists(reportfile))
   {
      struct stat buf;
      char strbuf[255];

      // check atime/mtime
      stat(reportfile.c_str(), &buf);
      if(buf.st_mtime > buf.st_atime)
         return;

      // check if the existing report is the same version
      report = fopen(reportfile.c_str(),"r");
      while(fgets(strbuf, sizeof(strbuf), report) != NULL)
      {
         if(strstr(strbuf,"Package:") == strbuf)
         {
            char pkgname[255], version[255];
            if(sscanf(strbuf, "Package: %254s %254s", pkgname, version) == 2)
               if(strcmp(pkgver.c_str(), version) == 0)
               {
                  fclose(report);
                  return;
               }
         }
      }
      fclose(report);
   }

   // now write the report
   arch = _config->Find("APT::Architecture");
   report = fopen(reportfile.c_str(),"w");
   if(report == NULL)
      return;
   if(_config->FindB("DPkgPM::InitialReportOnly",false) == true)
      chmod(reportfile.c_str(), 0);
   else
      chmod(reportfile.c_str(), 0600);
   fprintf(report, "ProblemType: Package\n");
   fprintf(report, "Architecture: %s\n", arch.c_str());
   time_t now = time(NULL);
   fprintf(report, "Date: %s" , ctime(&now));
   fprintf(report, "Package: %s %s\n", pkgname.c_str(), pkgver.c_str());
   fprintf(report, "SourcePackage: %s\n", srcpkgname.c_str());
   fprintf(report, "ErrorMessage:\n %s\n", errormsg);

   // ensure that the log is flushed
   if(d->term_out)
      fflush(d->term_out);

   // attach terminal log it if we have it
   string logfile_name = _config->FindFile("Dir::Log::Terminal");
   if (!logfile_name.empty())
   {
      FILE *log = NULL;

      fprintf(report, "DpkgTerminalLog:\n");
      log = fopen(logfile_name.c_str(),"r");
      if(log != NULL)
      {
         char buf[1024];
         while( fgets(buf, sizeof(buf), log) != NULL)
            fprintf(report, " %s", buf);
         fprintf(report, " \n");
         fclose(log);
      }
   }

   // attach history log it if we have it
   string histfile_name = _config->FindFile("Dir::Log::History");
   if (!histfile_name.empty())
   {
      fprintf(report, "DpkgHistoryLog:\n");
      FILE* log = fopen(histfile_name.c_str(),"r");
      if(log != NULL)
      {
         char buf[1024];
         while( fgets(buf, sizeof(buf), log) != NULL)
            fprintf(report, " %s", buf);
         fclose(log);
      }
   }

   // log the ordering 
   const char *ops_str[] = {"Install", "Configure","Remove","Purge"};
   fprintf(report, "AptOrdering:\n");
   for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
      if ((*I).Pkg != NULL)
         fprintf(report, " %s: %s\n", (*I).Pkg.Name(), ops_str[(*I).Op]);
      else
         fprintf(report, " %s: %s\n", "NULL", ops_str[(*I).Op]);

   // attach dmesg log (to learn about segfaults)
   if (FileExists("/bin/dmesg"))
   {
      fprintf(report, "Dmesg:\n");
      FILE *log = popen("/bin/dmesg","r");
      if(log != NULL)
      {
         char buf[1024];
         while( fgets(buf, sizeof(buf), log) != NULL)
            fprintf(report, " %s", buf);
         pclose(log);
      }
   }

   // attach df -l log (to learn about filesystem status)
   if (FileExists("/bin/df"))
   {

      fprintf(report, "Df:\n");
      FILE *log = popen("/bin/df -l","r");
      if(log != NULL)
      {
         char buf[1024];
         while( fgets(buf, sizeof(buf), log) != NULL)
            fprintf(report, " %s", buf);
         pclose(log);
      }
   }

   fclose(report);

}
                                                                        /*}}}*/