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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 <unistd.h>
#include "daemon.h"
#include "actions.h"
/* You must mount something on "/" first, hence: */
int root_mounted = 0;
/* The "simple mount" call offers no complex options, you can just
* mount a device on a mountpoint.
*
* It's tempting to try a direct mount(2) syscall, but that doesn't
* do any autodetection, so we are better off calling out to
* /bin/mount.
*/
int
do_mount (const char *device, const char *mountpoint)
{
int len, r, is_root;
char *mp;
char *error;
is_root = strcmp (mountpoint, "/") == 0;
if (!root_mounted && !is_root) {
reply_with_error ("mount: you must mount something on / first");
return -1;
}
len = strlen (mountpoint) + 9;
mp = malloc (len);
if (!mp) {
reply_with_perror ("malloc");
return -1;
}
snprintf (mp, len, "/sysroot%s", mountpoint);
r = command (NULL, &error,
"mount", "-o", "sync,noatime", device, mp, NULL);
if (r == -1) {
reply_with_error ("mount: %s on %s: %s", device, mountpoint, error);
free (error);
return -1;
}
if (is_root)
root_mounted = 1;
return 0;
}
/* Again, use the external /bin/umount program, so that /etc/mtab
* is kept updated.
*/
int
do_umount (const char *pathordevice)
{
int len, freeit = 0, r;
char *buf;
char *err;
if (strncmp (pathordevice, "/dev/", 5) == 0)
buf = (char *) pathordevice;
else {
len = strlen (pathordevice) + 9;
freeit = 1;
buf = malloc (len);
if (buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
snprintf (buf, len, "/sysroot%s", pathordevice);
}
r = command (NULL, &err, "umount", buf, NULL);
if (freeit) free (buf);
if (r == -1) {
reply_with_error ("umount: %s: %s", pathordevice, err);
free (err);
return -1;
}
free (err);
/* update root_mounted? */
return 0;
}
char **
do_mounts (void)
{
char *out, *err;
int r;
char **ret = NULL;
int size = 0, alloc = 0;
char *p, *pend, *p2;
r = command (&out, &err, "mount", NULL);
if (r == -1) {
reply_with_error ("mount: %s", err);
free (out);
free (err);
return NULL;
}
free (err);
p = out;
while (p) {
pend = strchr (p, '\n');
if (pend) {
*pend = '\0';
pend++;
}
/* Lines have the format:
* /dev/foo on /mountpoint type ...
*/
p2 = strstr (p, " on /sysroot");
if (p2 != NULL) {
*p2 = '\0';
if (add_string (&ret, &size, &alloc, p) == -1) {
free (out);
return NULL;
}
}
p = pend;
}
free (out);
if (add_string (&ret, &size, &alloc, NULL) == -1)
return NULL;
return ret;
}
/* Only unmount stuff under /sysroot */
int
do_umount_all (void)
{
char **mounts;
int i, r;
char *err;
mounts = do_mounts ();
if (mounts == NULL) /* do_mounts has already replied */
return -1;
for (i = 0; mounts[i] != NULL; ++i) {
r = command (NULL, &err, "umount", mounts[i], NULL);
if (r == -1) {
reply_with_error ("umount: %s: %s", mounts[i], err);
free (err);
free_strings (mounts);
return -1;
}
free (err);
}
free_strings (mounts);
return 0;
}
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