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

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: dpkgpm.cc,v 1.9 1999/04/20 05:02:09 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>
									/*}}}*/

// 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)
{
   if (Pkg.end() == true)
      return false;
   
   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::Go - Run the sequence					/*{{{*/
// ---------------------------------------------------------------------
/* This globs the operations and calls dpkg */
bool pkgDPkgPM::Go()
{
   if (RunScripts("DPkg::Pre-Invoke") == 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::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;
}
									/*}}}*/
Commit	Line	Data
03e39e59 AL	1	// -- mode: cpp; mode: fold --
03e39e59 AL	2	// Description /{{{/
54676e1a	3	// $Id: dpkgpm.cc,v 1.9 1999/04/20 05:02:09 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>
	25	/}}}/
	26
	27	// DPkgPM::pkgDPkgPM - Constructor /{{{/
	28	// ---------------------------------------------------------------------
	29	/* */
	30	pkgDPkgPM::pkgDPkgPM(pkgDepCache &Cache) : pkgPackageManager(Cache)
	31	{
	32	}
	33	/}}}/
	34	// DPkgPM::pkgDPkgPM - Destructor /{{{/
	35	// ---------------------------------------------------------------------
	36	/* */
	37	pkgDPkgPM::~pkgDPkgPM()
	38	{
	39	}
	40	/}}}/
	41	// DPkgPM::Install - Install a package /{{{/
	42	// ---------------------------------------------------------------------
	43	/* Add an install operation to the sequence list */
	44	bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
	45	{
	46	if (File.empty() == true \|\| Pkg.end() == true)
	47	return _error->Error("Internal Error, No file name for %s",Pkg.Name());
	48
	49	List.push_back(Item(Item::Install,Pkg,File));
	50	return true;
	51	}
	52	/}}}/
	53	// DPkgPM::Configure - Configure a package /{{{/
	54	// ---------------------------------------------------------------------
	55	/* Add a configure operation to the sequence list */
	56	bool pkgDPkgPM::Configure(PkgIterator Pkg)
	57	{
	58	if (Pkg.end() == true)
	59	return false;
	60
	61	List.push_back(Item(Item::Configure,Pkg));
	62	return true;
	63	}
	64	/}}}/
	65	// DPkgPM::Remove - Remove a package /{{{/
	66	// ---------------------------------------------------------------------
	67	/* Add a remove operation to the sequence list */
68	bool pkgDPkgPM::Remove(PkgIterator Pkg)
69	{
70	if (Pkg.end() == true)
71	return false;
72
73	List.push_back(Item(Item::Remove,Pkg));
6dd55be7 AL	74	return true;
	75	}
	76	/}}}/
	77	// DPkgPM::RunScripts - Run a set of scripts /{{{/
	78	// ---------------------------------------------------------------------
	79	/* This looks for a list of script sto run from the configuration file,
	80	each one is run with system from a forked child. */
	81	bool pkgDPkgPM::RunScripts(const char *Cnf)
	82	{
	83	Configuration::Item const *Opts = _config->Tree(Cnf);
	84	if (Opts == 0 \|\| Opts->Child == 0)
	85	return true;
	86	Opts = Opts->Child;
	87
	88	// Fork for running the system calls
54676e1a	89	pid_t Child = ExecFork();
6dd55be7 AL	90
	91	// This is the child
	92	if (Child == 0)
	93	{
6dd55be7 AL	94	if (chdir("/tmp/") != 0)
	95	_exit(100);
	96
6dd55be7 AL	97	unsigned int Count = 1;
	98	for (; Opts != 0; Opts = Opts->Next, Count++)
	99	{
	100	if (Opts->Value.empty() == true)
	101	continue;
	102
	103	if (system(Opts->Value.c_str()) != 0)
	104	_exit(100+Count);
	105	}
	106	_exit(0);
	107	}
	108
	109	// Wait for the child
	110	int Status = 0;
	111	while (waitpid(Child,&Status,0) != Child)
	112	{
	113	if (errno == EINTR)
	114	continue;
	115	return _error->Errno("waitpid","Couldn't wait for subprocess");
	116	}
	117
	118	// Restore sig int/quit
	119	signal(SIGQUIT,SIG_DFL);
	120	signal(SIGINT,SIG_DFL);
	121
	122	// Check for an error code.
	123	if (WIFEXITED(Status) == 0 \|\| WEXITSTATUS(Status) != 0)
	124	{
	125	unsigned int Count = WEXITSTATUS(Status);
	126	if (Count > 100)
	127	{
	128	Count -= 100;
	129	for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
cf544e14	130	_error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
6dd55be7 AL	131	}
	132
	133	return _error->Error("Sub-process returned an error code");
	134	}
	135
03e39e59 AL	136	return true;
	137	}
	138	/}}}/
	139	// DPkgPM::Go - Run the sequence /{{{/
	140	// ---------------------------------------------------------------------
	141	/* This globs the operations and calls dpkg */
	142	bool pkgDPkgPM::Go()
	143	{
6dd55be7 AL	144	if (RunScripts("DPkg::Pre-Invoke") == false)
	145	return false;
	146
03e39e59 AL	147	for (vector<Item>::iterator I = List.begin(); I != List.end();)
	148	{
	149	vector<Item>::iterator J = I;
	150	for (; J != List.end() && J->Op == I->Op; J++);
30e1eab5	151
03e39e59 AL	152	// Generate the argument list
	153	const char *Args[400];
	154	if (J - I > 350)
	155	J = I + 350;
	156
30e1eab5 AL	157	unsigned int n = 0;
	158	unsigned long Size = 0;
	159	Args[n++] = _config->Find("Dir::Bin::dpkg","dpkg").c_str();
	160	Size += strlen(Args[n-1]);
03e39e59	161
6dd55be7 AL	162	// Stick in any custom dpkg options
	163	Configuration::Item const *Opts = _config->Tree("DPkg::Options");
	164	if (Opts != 0)
	165	{
	166	Opts = Opts->Child;
	167	for (; Opts != 0; Opts = Opts->Next)
	168	{
	169	if (Opts->Value.empty() == true)
	170	continue;
	171	Args[n++] = Opts->Value.c_str();
	172	Size += Opts->Value.length();
	173	}
	174	}
	175
03e39e59 AL	176	switch (I->Op)
	177	{
	178	case Item::Remove:
	179	Args[n++] = "--force-depends";
30e1eab5	180	Size += strlen(Args[n-1]);
03e39e59	181	Args[n++] = "--force-remove-essential";
30e1eab5	182	Size += strlen(Args[n-1]);
03e39e59	183	Args[n++] = "--remove";
30e1eab5	184	Size += strlen(Args[n-1]);
03e39e59 AL	185	break;
	186
	187	case Item::Configure:
	188	Args[n++] = "--configure";
30e1eab5	189	Size += strlen(Args[n-1]);
03e39e59 AL	190	break;
	191
	192	case Item::Install:
	193	Args[n++] = "--unpack";
30e1eab5	194	Size += strlen(Args[n-1]);
03e39e59 AL	195	break;
	196	}
	197
	198	// Write in the file or package names
	199	if (I->Op == Item::Install)
30e1eab5 AL	200	{
	201	for (;I != J && Size < 1024; I++)
	202	{
cf544e14 AL	203	if (I->File[0] != '/')
cf544e14 AL	204	return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
03e39e59	205	Args[n++] = I->File.c_str();
30e1eab5 AL	206	Size += strlen(Args[n-1]);
	207	}
	208	}
03e39e59	209	else
30e1eab5 AL	210	{
	211	for (;I != J && Size < 1024; I++)
	212	{
03e39e59	213	Args[n++] = I->Pkg.Name();
30e1eab5 AL	214	Size += strlen(Args[n-1]);
	215	}
	216	}
03e39e59	217	Args[n] = 0;
30e1eab5 AL	218	J = I;
	219
	220	if (_config->FindB("Debug::pkgDPkgPM",false) == true)
	221	{
	222	for (unsigned int k = 0; k != n; k++)
	223	clog << Args[k] << ' ';
	224	clog << endl;
	225	continue;
	226	}
03e39e59	227
03e39e59 AL	228	cout << flush;
	229	clog << flush;
	230	cerr << flush;
	231
	232	/* Mask off sig int/quit. We do this because dpkg also does when
	233	it forks scripts. What happens is that when you hit ctrl-c it sends
	234	it to all processes in the group. Since dpkg ignores the signal
	235	it doesn't die but we do! So we must also ignore it */
	236	signal(SIGQUIT,SIG_IGN);
	237	signal(SIGINT,SIG_IGN);
6dd55be7	238
03e39e59	239	// Fork dpkg
54676e1a	240	pid_t Child = ExecFork();
6dd55be7	241
03e39e59 AL	242	// This is the child
	243	if (Child == 0)
	244	{
cf544e14	245	if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
0dbb95d8	246	_exit(100);
03e39e59	247
03e39e59 AL	248	int Flags,dummy;
03e39e59 AL	249	if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
0dbb95d8	250	_exit(100);
03e39e59 AL	251
	252	// Discard everything in stdin before forking dpkg
	253	if (fcntl(STDIN_FILENO,F_SETFL,Flags \| O_NONBLOCK) < 0)
0dbb95d8	254	_exit(100);
03e39e59 AL	255
	256	while (read(STDIN_FILENO,&dummy,1) == 1);
	257
	258	if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
0dbb95d8	259	_exit(100);
03e39e59 AL	260
	261	/* No Job Control Stop Env is a magic dpkg var that prevents it
	262	from using sigstop */
	263	setenv("DPKG_NO_TSTP","yes",1);
d568ed2d	264	execvp(Args[0],(char **)Args);
03e39e59	265	cerr << "Could not exec dpkg!" << endl;
0dbb95d8	266	_exit(100);
03e39e59 AL	267	}
	268
	269	// Wait for dpkg
	270	int Status = 0;
	271	while (waitpid(Child,&Status,0) != Child)
	272	{
	273	if (errno == EINTR)
	274	continue;
6dd55be7	275	RunScripts("DPkg::Post-Invoke");
03e39e59 AL	276	return _error->Errno("waitpid","Couldn't wait for subprocess");
03e39e59 AL	277	}
03e39e59 AL	278
	279	// Restore sig int/quit
	280	signal(SIGQUIT,SIG_DFL);
	281	signal(SIGINT,SIG_DFL);
6dd55be7 AL	282
	283	// Check for an error code.
	284	if (WIFEXITED(Status) == 0 \|\| WEXITSTATUS(Status) != 0)
	285	{
	286	RunScripts("DPkg::Post-Invoke");
f956efb4 AL	287	if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
	288	return _error->Error("Sub-process recieved a segmentation fault.");
	289
	290	if (WIFEXITED(Status) != 0)
	291	return _error->Error("Sub-process returned an error code (%u)",WEXITSTATUS(Status));
	292
	293	return _error->Error("Sub-process exited unexpectedly");
6dd55be7	294	}
03e39e59	295	}
6dd55be7 AL	296
	297	if (RunScripts("DPkg::Post-Invoke") == false)
	298	return false;
03e39e59 AL	299	return true;
	300	}
	301	/}}}/