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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "daemon.h"
#include "actions.h"
GUESTFSD_EXT_CMD(str_sfdisk, sfdisk);
GUESTFSD_EXT_CMD(str_blockdev, blockdev);
static int
sfdisk (const char *device, int n, int cyls, int heads, int sectors,
const char *extra_flag,
char *const *lines)
{
FILE *fp;
char buf[256];
int i;
strcpy (buf, str_sfdisk);
if (n > 0)
sprintf (buf + strlen (buf), " -N %d", n);
if (cyls)
sprintf (buf + strlen (buf), " -C %d", cyls);
if (heads)
sprintf (buf + strlen (buf), " -H %d", heads);
if (sectors)
sprintf (buf + strlen (buf), " -S %d", sectors);
/* The above are all guaranteed to fit in the fixed-size buffer.
However, extra_flag and device have no restrictions,
so we must check. */
if (extra_flag) {
if (strlen (buf) + 1 + strlen (extra_flag) >= sizeof buf) {
reply_with_error ("internal buffer overflow: sfdisk extra_flag too long");
return -1;
}
sprintf (buf + strlen (buf), " %s", extra_flag);
}
if (strlen (buf) + 1 + strlen (device) >= sizeof buf) {
reply_with_error ("internal buffer overflow: sfdisk device name too long");
return -1;
}
sprintf (buf + strlen (buf), " %s", device);
if (verbose)
printf ("%s\n", buf);
fp = popen (buf, "w");
if (fp == NULL) {
reply_with_perror ("failed to open pipe: %s", buf);
return -1;
}
for (i = 0; lines[i] != NULL; ++i) {
if (fprintf (fp, "%s\n", lines[i]) < 0) {
reply_with_perror ("failed to write to pipe: %s", buf);
pclose (fp);
return -1;
}
}
if (pclose (fp) != 0) {
reply_with_error ("%s: external command failed", buf);
return -1;
}
/* sfdisk sometimes fails on fast machines with:
*
* Re-reading the partition table ...
* BLKRRPART: Device or resource busy
* The command to re-read the partition table failed.
* Run partprobe(8), kpartx(8) or reboot your system now,
* before using mkfs
*
* Unclear if this is a bug in sfdisk or the kernel or some
* other component. In any case, reread the partition table
* unconditionally here.
*/
(void) command (NULL, NULL, str_blockdev, "--rereadpt", device, NULL);
udev_settle ();
return 0;
}
int
do_sfdisk (const char *device, int cyls, int heads, int sectors,
char *const *lines)
{
return sfdisk (device, 0, cyls, heads, sectors, NULL, lines);
}
int
do_sfdisk_N (const char *device, int n, int cyls, int heads, int sectors,
const char *line)
{
char const *const lines[2] = { line, NULL };
return sfdisk (device, n, cyls, heads, sectors, NULL, (void *) lines);
}
int
do_sfdiskM (const char *device, char *const *lines)
{
return sfdisk (device, 0, 0, 0, 0, "-uM", lines);
}
static char *
sfdisk_flag (const char *device, const char *flag)
{
char *out, *err;
int r;
r = command (&out, &err, str_sfdisk, flag, device, NULL);
if (r == -1) {
reply_with_error ("%s: %s", device, err);
free (out);
free (err);
return NULL;
}
free (err);
udev_settle ();
return out; /* caller frees */
}
char *
do_sfdisk_l (const char *device)
{
return sfdisk_flag (device, "-l");
}
char *
do_sfdisk_kernel_geometry (const char *device)
{
return sfdisk_flag (device, "-g");
}
char *
do_sfdisk_disk_geometry (const char *device)
{
return sfdisk_flag (device, "-G");
}
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