apt/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;

APT_PURE static unsigned int
EnvironmentSize()
{
  unsigned int size = 0;
  char **envp = environ;

  while (*envp != NULL)
    size += strlen (*envp++) + 1;

  return size;
}

class pkgDPkgPMPrivate 
{
public:
   pkgDPkgPMPrivate() : stdin_is_dev_null(false), dpkgbuf_pos(0),
			term_out(NULL), history_out(NULL),
			progress(NULL), tt_is_valid(false), master(-1),
			slave(NULL), protect_slave_from_dying(-1),
			direct_stdin(false)
   {
      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;
   bool tt_is_valid;
   int master;
   char * slave;
   int protect_slave_from_dying;

   // signals
   sigset_t sigmask;
   sigset_t original_sigmask;

   bool direct_stdin;
};

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)
      for (pkgCache::VerFileIterator Vf = Ver.FileList(); Vf.end() == false; ++Vf)
	 for (pkgCache::PkgFileIterator F = Vf.File(); F.end() == false; ++F)
	    if (F->Archive != 0 && strcmp(F.Archive(), "now") == 0)
	       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 master pty			/*{{{*/
// ---------------------------------------------------------------------
/*
*/
void pkgDPkgPM::DoStdin(int master)
{
   unsigned char input_buf[256] = {0,}; 
   ssize_t len = read(STDIN_FILENO, 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,upgrade,configure,remove,purge,disappear,trigproc}: pkg'
      'processing: {install,upgrade,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", "upgrade", "configure", "remove", "purge",
   //                "disappear", "trigproc"]
   if (prefix == "processing")
   {
      pkgname = APT::String::Strip(list[2]);
      action = APT::String::Strip(list[1]);
      // we don't care for the difference (as dpkg doesn't really either)
      if (action == "upgrade")
	 action = "install";
   }
   // "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 always send "pkgname:arch" so we add it here if needed