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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../src/guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
char *
do_command (char * const * const argv)
{
char *out, *err;
int r;
int proc_ok, dev_ok, sys_ok;
/* We need a root filesystem mounted to do this. */
NEED_ROOT (NULL);
/* Conveniently, argv is already a NULL-terminated argv-style array
* of parameters, so we can pass it straight in to our internal
* commandv. We just have to check the list is non-empty.
*/
if (argv[0] == NULL) {
reply_with_error ("command: passed an empty list");
return NULL;
}
/* While running the command, bind-mount /dev, /proc, /sys
* into the chroot. However we must be careful to unmount them
* afterwards because otherwise they would interfere with
* future mount and unmount operations.
*
* We deliberately allow these commands to fail silently, BUT
* if a mount fails, don't unmount the corresponding mount.
*/
r = command (NULL, NULL, "mount", "--rbind", "/dev", "/sysroot/dev", NULL);
dev_ok = r != -1;
r = command (NULL, NULL, "mount", "--rbind", "/proc", "/sysroot/proc", NULL);
proc_ok = r != -1;
r = command (NULL, NULL, "mount", "--rbind", "/sys", "/sysroot/sys", NULL);
sys_ok = r != -1;
CHROOT_IN;
r = commandv (&out, &err, argv);
CHROOT_OUT;
if (sys_ok) command (NULL, NULL, "umount", "/sysroot/sys", NULL);
if (proc_ok) command (NULL, NULL, "umount", "/sysroot/proc", NULL);
if (dev_ok) command (NULL, NULL, "umount", "/sysroot/dev", NULL);
if (r == -1) {
reply_with_error ("%s", err);
free (out);
free (err);
return NULL;
}
free (err);
return out; /* Caller frees. */
}
char **
do_command_lines (char * const * const argv)
{
char *out;
char **lines;
out = do_command (argv);
if (out == NULL)
return NULL;
lines = split_lines (out);
free (out);
if (lines == NULL)
return NULL;
return lines; /* Caller frees. */
}
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