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

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: dpkgpm.cc,v 1.13 1999/07/30 06:15:14 jgg Exp $
/* ######################################################################

   DPKG Package Manager - Provide an interface to dpkg
   
   ##################################################################### */
									/*}}}*/
// Includes								/*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/dpkgpm.h"
#endif
#include <apt-pkg/dpkgpm.h>
#include <apt-pkg/error.h>
#include <apt-pkg/configuration.h>

#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <stdio.h>
									/*}}}*/

// DPkgPM::pkgDPkgPM - Constructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgDPkgPM::pkgDPkgPM(pkgDepCache &Cache) : pkgPackageManager(Cache)
{
}
									/*}}}*/
// DPkgPM::pkgDPkgPM - Destructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgDPkgPM::~pkgDPkgPM()
{
}
									/*}}}*/
// 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.Name());

   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));
   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::RunScripts - Run a set of scripts				/*{{{*/
// ---------------------------------------------------------------------
/* This looks for a list of script sto run from the configuration file,
   each one is run with system from a forked child. */
bool pkgDPkgPM::RunScripts(const char *Cnf)
{
   Configuration::Item const *Opts = _config->Tree(Cnf);
   if (Opts == 0 || Opts->Child == 0)
      return true;
   Opts = Opts->Child;

   // Fork for running the system calls
   pid_t Child = ExecFork();
   
   // This is the child
   if (Child == 0)
   {
      if (chdir("/tmp/") != 0)
	 _exit(100);
	 
      unsigned int Count = 1;
      for (; Opts != 0; Opts = Opts->Next, Count++)
      {
	 if (Opts->Value.empty() == true)
	    continue;
	 
	 if (system(Opts->Value.c_str()) != 0)
	    _exit(100+Count);
      }
      _exit(0);
   }      

   // Wait for the child
   int Status = 0;
   while (waitpid(Child,&Status,0) != Child)
   {
      if (errno == EINTR)
	 continue;
      return _error->Errno("waitpid","Couldn't wait for subprocess");
   }

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

   // Check for an error code.
   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
   {
      unsigned int Count = WEXITSTATUS(Status);
      if (Count > 100)
      {
	 Count -= 100;
	 for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
	 _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
      }
      
      return _error->Error("Sub-process returned an error code");
   }
   
   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)
{
   Configuration::Item const *Opts = _config->Tree(Cnf);
   if (Opts == 0 || Opts->Child == 0)
      return true;
   Opts = Opts->Child;
   
   unsigned int Count = 1;
   for (; Opts != 0; Opts = Opts->Next, Count++)
   {
      if (Opts->Value.empty() == true)
         continue;
		
      // Create the pipes
      int Pipes[2];
      if (pipe(Pipes) != 0)
	 return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
      SetCloseExec(Pipes[0],true);
      SetCloseExec(Pipes[1],true);
      
      // Purified Fork for running the script
      pid_t Process = ExecFork();      
      if (Process == 0)
      {
	 // Setup the FDs
	 dup2(Pipes[0],STDIN_FILENO);
	 SetCloseExec(STDOUT_FILENO,false);
	 SetCloseExec(STDIN_FILENO,false);      
	 SetCloseExec(STDERR_FILENO,false);
	 
	 const char *Args[5];
	 Args[0] = "/bin/sh";
	 Args[1] = "/bin/sh";
	 Args[2] = "-c";
	 Args[3] = Opts->Value.c_str();
	 Args[4] = 0;
	 execv(Args[0],(char **)Args);
	 _exit(100);
      }
      close(Pipes[0]);
      FileFd Fd(Pipes[1]);

      // Feed it the filenames.
      for (vector<Item>::iterator I = List.begin(); I != List.end();)
      {
	 // 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. */
	 if (Fd.Write(I->File.begin(),I->File.length()) == false || 
	     Fd.Write("\n",1) == false)
	 {
	    kill(Process,SIGINT);	    
	    Fd.Close();   
	    ExecWait(Process,Opts->Value.c_str(),true);
	    return false;
	 }	    
      }
      Fd.Close();
      
      // Clean up the sub process
      if (ExecWait(Process,Opts->Value.c_str()) == false)
	 return false;
   }

   return true;
}

									/*}}}*/
// DPkgPM::Go - Run the sequence					/*{{{*/
// ---------------------------------------------------------------------
/* This globs the operations and calls dpkg */
bool pkgDPkgPM::Go()
{
   if (RunScripts("DPkg::Pre-Invoke") == false)
      return false;

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

   for (vector<Item>::iterator I = List.begin(); I != List.end();)
   {
      vector<Item>::iterator J = I;
      for (; J != List.end() && J->Op == I->Op; J++);

      // Generate the argument list
      const char *Args[400];
      if (J - I > 350)
	 J = I + 350;
      
      unsigned int n = 0;
      unsigned long Size = 0;
      Args[n++] = _config->Find("Dir::Bin::dpkg","dpkg").c_str();
      Size += strlen(Args[n-1]);
      
      // 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[n++] = Opts->Value.c_str();
	    Size += Opts->Value.length();
	 }	 
      }
      
      switch (I->Op)
      {
	 case Item::Remove:
	 Args[n++] = "--force-depends";
	 Size += strlen(Args[n-1]);
	 Args[n++] = "--force-remove-essential";
	 Size += strlen(Args[n-1]);
	 Args[n++] = "--remove";
	 Size += strlen(Args[n-1]);
	 break;
	 
	 case Item::Purge:
	 Args[n++] = "--force-depends";
	 Size += strlen(Args[n-1]);
	 Args[n++] = "--force-remove-essential";
	 Size += strlen(Args[n-1]);
	 Args[n++] = "--purge";
	 Size += strlen(Args[n-1]);
	 break;
	 
	 case Item::Configure:
	 Args[n++] = "--configure";
	 Size += strlen(Args[n-1]);
	 break;
	 
	 case Item::Install:
	 Args[n++] = "--unpack";
	 Size += strlen(Args[n-1]);
	 break;
      }
      
      // Write in the file or package names
      if (I->Op == Item::Install)
      {
	 for (;I != J && Size < 1024; I++)
	 {
	    if (I->File[0] != '/')
	       return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
	    Args[n++] = I->File.c_str();
	    Size += strlen(Args[n-1]);
	 }
      }      
      else
      {
	 for (;I != J && Size < 1024; I++)
	 {
	    Args[n++] = I->Pkg.Name();
	    Size += strlen(Args[n-1]);
	 }	 
      }      
      Args[n] = 0;
      J = I;
      
      if (_config->FindB("Debug::pkgDPkgPM",false) == true)
      {
	 for (unsigned int k = 0; k != n; k++)
	    clog << Args[k] << ' ';
	 clog << endl;
	 continue;
      }
      
      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 */
      signal(SIGQUIT,SIG_IGN);
      signal(SIGINT,SIG_IGN);
		     
      // Fork dpkg
      pid_t Child = ExecFork();
            
      // This is the child
      if (Child == 0)
      {
	 if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
	    _exit(100);
	 
	 int Flags,dummy;
	 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 */
	 setenv("DPKG_NO_TSTP","yes",1);
	 execvp(Args[0],(char **)Args);
	 cerr << "Could not exec dpkg!" << endl;
	 _exit(100);
      }      

      // Wait for dpkg
      int Status = 0;
      while (waitpid(Child,&Status,0) != Child)
      {
	 if (errno == EINTR)
	    continue;
	 RunScripts("DPkg::Post-Invoke");
	 return _error->Errno("waitpid","Couldn't wait for subprocess");
      }

      // Restore sig int/quit
      signal(SIGQUIT,SIG_DFL);
      signal(SIGINT,SIG_DFL);
       
      // Check for an error code.
      if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
      {
	 RunScripts("DPkg::Post-Invoke");
	 if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
	    return _error->Error("Sub-process recieved a segmentation fault.");
	    
	 if (WIFEXITED(Status) != 0)
	    return _error->Error("Sub-process returned an error code (%u)",WEXITSTATUS(Status));
	 
	 return _error->Error("Sub-process exited unexpectedly");
      }      
   }

   if (RunScripts("DPkg::Post-Invoke") == false)
      return false;
   return true;
}
									/*}}}*/
// pkgDpkgPM::Reset - Dump the contents of the command list		/*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgDPkgPM::Reset() 
{
   List.erase(List.begin(),List.end());
}
									/*}}}*/
Commit	Line	Data
03e39e59 AL	1	// -- mode: cpp; mode: fold --
03e39e59 AL	2	// Description /{{{/
db0c350f	3	// $Id: dpkgpm.cc,v 1.13 1999/07/30 06:15:14 jgg Exp $
03e39e59 AL	4	/* ######################################################################
	5
	6	DPKG Package Manager - Provide an interface to dpkg
	7
	8	##################################################################### */
	9	/}}}/
	10	// Includes /{{{/
	11	#ifdef __GNUG__
	12	#pragma implementation "apt-pkg/dpkgpm.h"
	13	#endif
	14	#include <apt-pkg/dpkgpm.h>
	15	#include <apt-pkg/error.h>
	16	#include <apt-pkg/configuration.h>
	17
	18	#include <unistd.h>
	19	#include <stdlib.h>
	20	#include <fcntl.h>
	21	#include <sys/types.h>
	22	#include <sys/wait.h>
	23	#include <signal.h>
	24	#include <errno.h>
db0c350f	25	#include <stdio.h>
03e39e59 AL	26	/}}}/
	27
	28	// DPkgPM::pkgDPkgPM - Constructor /{{{/
	29	// ---------------------------------------------------------------------
	30	/* */
	31	pkgDPkgPM::pkgDPkgPM(pkgDepCache &Cache) : pkgPackageManager(Cache)
	32	{
	33	}
	34	/}}}/
	35	// DPkgPM::pkgDPkgPM - Destructor /{{{/
	36	// ---------------------------------------------------------------------
	37	/* */
	38	pkgDPkgPM::~pkgDPkgPM()
	39	{
	40	}
	41	/}}}/
	42	// DPkgPM::Install - Install a package /{{{/
	43	// ---------------------------------------------------------------------
	44	/* Add an install operation to the sequence list */
	45	bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
	46	{
	47	if (File.empty() == true \|\| Pkg.end() == true)
	48	return _error->Error("Internal Error, No file name for %s",Pkg.Name());
	49
	50	List.push_back(Item(Item::Install,Pkg,File));
	51	return true;
	52	}
	53	/}}}/
	54	// DPkgPM::Configure - Configure a package /{{{/
	55	// ---------------------------------------------------------------------
	56	/* Add a configure operation to the sequence list */
	57	bool pkgDPkgPM::Configure(PkgIterator Pkg)
	58	{
	59	if (Pkg.end() == true)
	60	return false;
	61
	62	List.push_back(Item(Item::Configure,Pkg));
	63	return true;
	64	}
	65	/}}}/
	66	// DPkgPM::Remove - Remove a package /{{{/
	67	// ---------------------------------------------------------------------
	68	/* Add a remove operation to the sequence list */
fc4b5c9f	69	bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
03e39e59 AL	70	{
	71	if (Pkg.end() == true)
	72	return false;
	73
fc4b5c9f AL	74	if (Purge == true)
	75	List.push_back(Item(Item::Purge,Pkg));
	76	else
	77	List.push_back(Item(Item::Remove,Pkg));
6dd55be7 AL	78	return true;
	79	}
	80	/}}}/
	81	// DPkgPM::RunScripts - Run a set of scripts /{{{/
	82	// ---------------------------------------------------------------------
	83	/* This looks for a list of script sto run from the configuration file,
	84	each one is run with system from a forked child. */
	85	bool pkgDPkgPM::RunScripts(const char *Cnf)
	86	{
	87	Configuration::Item const *Opts = _config->Tree(Cnf);
	88	if (Opts == 0 \|\| Opts->Child == 0)
	89	return true;
	90	Opts = Opts->Child;
	91
	92	// Fork for running the system calls
54676e1a	93	pid_t Child = ExecFork();
6dd55be7 AL	94
	95	// This is the child
	96	if (Child == 0)
	97	{
6dd55be7 AL	98	if (chdir("/tmp/") != 0)
	99	_exit(100);
	100
6dd55be7 AL	101	unsigned int Count = 1;
	102	for (; Opts != 0; Opts = Opts->Next, Count++)
	103	{
	104	if (Opts->Value.empty() == true)
	105	continue;
	106
	107	if (system(Opts->Value.c_str()) != 0)
	108	_exit(100+Count);
	109	}
	110	_exit(0);
	111	}
	112
	113	// Wait for the child
	114	int Status = 0;
	115	while (waitpid(Child,&Status,0) != Child)
	116	{
	117	if (errno == EINTR)
	118	continue;
	119	return _error->Errno("waitpid","Couldn't wait for subprocess");
	120	}
	121
	122	// Restore sig int/quit
	123	signal(SIGQUIT,SIG_DFL);
	124	signal(SIGINT,SIG_DFL);
ddc1d8d0	125
6dd55be7 AL	126	// Check for an error code.
	127	if (WIFEXITED(Status) == 0 \|\| WEXITSTATUS(Status) != 0)
	128	{
	129	unsigned int Count = WEXITSTATUS(Status);
	130	if (Count > 100)
	131	{
	132	Count -= 100;
	133	for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
cf544e14	134	_error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
6dd55be7 AL	135	}
	136
	137	return _error->Error("Sub-process returned an error code");
	138	}
	139
03e39e59 AL	140	return true;
03e39e59 AL	141	}
db0c350f AL	142
	143	/}}}/
	144	// DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /{{{/
	145	// ---------------------------------------------------------------------
	146	/* This looks for a list of scripts to run from the configuration file
	147	each one is run and is fed on standard input a list of all .deb files
	148	that are due to be installed. */
	149	bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
	150	{
	151	Configuration::Item const *Opts = _config->Tree(Cnf);
	152	if (Opts == 0 \|\| Opts->Child == 0)
	153	return true;
	154	Opts = Opts->Child;
	155
	156	unsigned int Count = 1;
	157	for (; Opts != 0; Opts = Opts->Next, Count++)
	158	{
	159	if (Opts->Value.empty() == true)
	160	continue;
	161
	162	// Create the pipes
	163	int Pipes[2];
	164	if (pipe(Pipes) != 0)
	165	return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
	166	SetCloseExec(Pipes[0],true);
	167	SetCloseExec(Pipes[1],true);
	168
	169	// Purified Fork for running the script
	170	pid_t Process = ExecFork();
	171	if (Process == 0)
	172	{
	173	// Setup the FDs
	174	dup2(Pipes[0],STDIN_FILENO);
	175	SetCloseExec(STDOUT_FILENO,false);
	176	SetCloseExec(STDIN_FILENO,false);
	177	SetCloseExec(STDERR_FILENO,false);
	178
	179	const char *Args[5];
	180	Args[0] = "/bin/sh";
	181	Args[1] = "/bin/sh";
	182	Args[2] = "-c";
	183	Args[3] = Opts->Value.c_str();
	184	Args[4] = 0;
	185	execv(Args[0],(char **)Args);
	186	_exit(100);
	187	}
	188	close(Pipes[0]);
	189	FileFd Fd(Pipes[1]);
	190
	191	// Feed it the filenames.
	192	for (vector<Item>::iterator I = List.begin(); I != List.end();)
	193	{
	194	// Only deal with packages to be installed from .deb
	195	if (I->Op != Item::Install)
	196	continue;
	197
	198	// No errors here..
	199	if (I->File[0] != '/')
	200	continue;
	201
	202	/* Feed the filename of each package that is pending install
	203	into the pipe. */
	204	if (Fd.Write(I->File.begin(),I->File.length()) == false \|\|
	205	Fd.Write("\n",1) == false)
206	{
207	kill(Process,SIGINT);
208	Fd.Close();
209	ExecWait(Process,Opts->Value.c_str(),true);
210	return false;
211	}
212	}
213	Fd.Close();
214
215	// Clean up the sub process
216	if (ExecWait(Process,Opts->Value.c_str()) == false)
217	return false;
218	}
219
220	return true;
221	}
222
03e39e59 AL	223	/}}}/
	224	// DPkgPM::Go - Run the sequence /{{{/
	225	// ---------------------------------------------------------------------
	226	/* This globs the operations and calls dpkg */
	227	bool pkgDPkgPM::Go()
	228	{
6dd55be7 AL	229	if (RunScripts("DPkg::Pre-Invoke") == false)
6dd55be7 AL	230	return false;
db0c350f AL	231
	232	if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
	233	return false;
	234
03e39e59 AL	235	for (vector<Item>::iterator I = List.begin(); I != List.end();)
	236	{
	237	vector<Item>::iterator J = I;
	238	for (; J != List.end() && J->Op == I->Op; J++);
30e1eab5	239
03e39e59 AL	240	// Generate the argument list
	241	const char *Args[400];
	242	if (J - I > 350)
	243	J = I + 350;
	244
30e1eab5 AL	245	unsigned int n = 0;
	246	unsigned long Size = 0;
	247	Args[n++] = _config->Find("Dir::Bin::dpkg","dpkg").c_str();
	248	Size += strlen(Args[n-1]);
03e39e59	249
6dd55be7 AL	250	// Stick in any custom dpkg options
	251	Configuration::Item const *Opts = _config->Tree("DPkg::Options");
	252	if (Opts != 0)
	253	{
	254	Opts = Opts->Child;
	255	for (; Opts != 0; Opts = Opts->Next)
	256	{
	257	if (Opts->Value.empty() == true)
	258	continue;
	259	Args[n++] = Opts->Value.c_str();
	260	Size += Opts->Value.length();
	261	}
	262	}
	263
03e39e59 AL	264	switch (I->Op)
	265	{
	266	case Item::Remove:
	267	Args[n++] = "--force-depends";
30e1eab5	268	Size += strlen(Args[n-1]);
03e39e59	269	Args[n++] = "--force-remove-essential";
30e1eab5	270	Size += strlen(Args[n-1]);
03e39e59	271	Args[n++] = "--remove";
30e1eab5	272	Size += strlen(Args[n-1]);
03e39e59 AL	273	break;
03e39e59 AL	274
fc4b5c9f AL	275	case Item::Purge:
	276	Args[n++] = "--force-depends";
	277	Size += strlen(Args[n-1]);
	278	Args[n++] = "--force-remove-essential";
	279	Size += strlen(Args[n-1]);
	280	Args[n++] = "--purge";
	281	Size += strlen(Args[n-1]);
	282	break;
	283
03e39e59 AL	284	case Item::Configure:
03e39e59 AL	285	Args[n++] = "--configure";
30e1eab5	286	Size += strlen(Args[n-1]);
03e39e59 AL	287	break;
	288
	289	case Item::Install:
	290	Args[n++] = "--unpack";
30e1eab5	291	Size += strlen(Args[n-1]);
03e39e59 AL	292	break;
	293	}
	294
	295	// Write in the file or package names
	296	if (I->Op == Item::Install)
30e1eab5 AL	297	{
	298	for (;I != J && Size < 1024; I++)
	299	{
cf544e14 AL	300	if (I->File[0] != '/')
cf544e14 AL	301	return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
03e39e59	302	Args[n++] = I->File.c_str();
30e1eab5 AL	303	Size += strlen(Args[n-1]);
	304	}
	305	}
03e39e59	306	else
30e1eab5 AL	307	{
	308	for (;I != J && Size < 1024; I++)
	309	{
03e39e59	310	Args[n++] = I->Pkg.Name();
30e1eab5 AL	311	Size += strlen(Args[n-1]);
	312	}
	313	}
03e39e59	314	Args[n] = 0;
30e1eab5 AL	315	J = I;
	316
	317	if (_config->FindB("Debug::pkgDPkgPM",false) == true)
	318	{
	319	for (unsigned int k = 0; k != n; k++)
	320	clog << Args[k] << ' ';
	321	clog << endl;
	322	continue;
	323	}
03e39e59	324
03e39e59 AL	325	cout << flush;
	326	clog << flush;
	327	cerr << flush;
	328
	329	/* Mask off sig int/quit. We do this because dpkg also does when
	330	it forks scripts. What happens is that when you hit ctrl-c it sends
	331	it to all processes in the group. Since dpkg ignores the signal
	332	it doesn't die but we do! So we must also ignore it */
	333	signal(SIGQUIT,SIG_IGN);
	334	signal(SIGINT,SIG_IGN);
6dd55be7	335
03e39e59	336	// Fork dpkg
54676e1a	337	pid_t Child = ExecFork();
6dd55be7	338
03e39e59 AL	339	// This is the child
	340	if (Child == 0)
	341	{
cf544e14	342	if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
0dbb95d8	343	_exit(100);
03e39e59	344
03e39e59 AL	345	int Flags,dummy;
03e39e59 AL	346	if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
0dbb95d8	347	_exit(100);
03e39e59 AL	348
	349	// Discard everything in stdin before forking dpkg
	350	if (fcntl(STDIN_FILENO,F_SETFL,Flags \| O_NONBLOCK) < 0)
0dbb95d8	351	_exit(100);
03e39e59 AL	352
	353	while (read(STDIN_FILENO,&dummy,1) == 1);
	354
	355	if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
0dbb95d8	356	_exit(100);
03e39e59 AL	357
	358	/* No Job Control Stop Env is a magic dpkg var that prevents it
	359	from using sigstop */
	360	setenv("DPKG_NO_TSTP","yes",1);
d568ed2d	361	execvp(Args[0],(char **)Args);
03e39e59	362	cerr << "Could not exec dpkg!" << endl;
0dbb95d8	363	_exit(100);
03e39e59 AL	364	}
	365
	366	// Wait for dpkg
	367	int Status = 0;
	368	while (waitpid(Child,&Status,0) != Child)
	369	{
	370	if (errno == EINTR)
	371	continue;
6dd55be7	372	RunScripts("DPkg::Post-Invoke");
03e39e59 AL	373	return _error->Errno("waitpid","Couldn't wait for subprocess");
03e39e59 AL	374	}
03e39e59 AL	375
	376	// Restore sig int/quit
	377	signal(SIGQUIT,SIG_DFL);
	378	signal(SIGINT,SIG_DFL);
6dd55be7 AL	379
	380	// Check for an error code.
	381	if (WIFEXITED(Status) == 0 \|\| WEXITSTATUS(Status) != 0)
	382	{
	383	RunScripts("DPkg::Post-Invoke");
f956efb4 AL	384	if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
	385	return _error->Error("Sub-process recieved a segmentation fault.");
	386
	387	if (WIFEXITED(Status) != 0)
	388	return _error->Error("Sub-process returned an error code (%u)",WEXITSTATUS(Status));
	389
	390	return _error->Error("Sub-process exited unexpectedly");
6dd55be7	391	}
03e39e59	392	}
6dd55be7 AL	393
	394	if (RunScripts("DPkg::Post-Invoke") == false)
	395	return false;
03e39e59 AL	396	return true;
	397	}
	398	/}}}/
281daf46 AL	399	// pkgDpkgPM::Reset - Dump the contents of the command list /{{{/
	400	// ---------------------------------------------------------------------
	401	/* */
	402	void pkgDPkgPM::Reset()
	403	{
	404	List.erase(List.begin(),List.end());
	405	}
	406	/}}}/