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/* virt-rescue
* Copyright (C) 2010-2019 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 <locale.h>
#include <libintl.h>
#include "guestfs.h"
#include "guestfs-utils.h"
#include "options.h"
#include "rescue.h"
static void suggest_filesystems (void);
static int
compare_keys_len (const void *p1, const void *p2)
{
const char *key1 = * (char * const *) p1;
const char *key2 = * (char * const *) p2;
return strlen (key1) - strlen (key2);
}
/* virt-rescue --suggest flag does a kind of inspection on the
* drives and suggests mount commands that you should use.
*/
void
do_suggestion (struct drv *drvs)
{
CLEANUP_FREE_STRING_LIST char **roots = NULL;
size_t i;
/* For inspection, force add_drives to add the drives read-only. */
read_only = 1;
/* Add drives. */
add_drives (drvs);
/* Free up data structures, no longer needed after this point. */
free_drives (drvs);
printf (_("Inspecting the virtual machine or disk image ...\n\n"));
fflush (stdout);
if (guestfs_launch (g) == -1)
exit (EXIT_FAILURE);
/* Don't use inspect_mount, since for virt-rescue we should allow
* arbitrary disks and disks with more than one OS on them. Let's
* do this using the basic API instead.
*/
roots = guestfs_inspect_os (g);
if (roots == NULL)
exit (EXIT_FAILURE);
if (roots[0] == NULL) {
suggest_filesystems ();
return;
}
printf (_("This disk contains one or more operating systems. You can use these mount\n"
"commands in virt-rescue (at the ><rescue> prompt) to mount the filesystems.\n\n"));
for (i = 0; roots[i] != NULL; ++i) {
CLEANUP_FREE_STRING_LIST char **mps = NULL;
CLEANUP_FREE char *type = NULL, *distro = NULL, *product_name = NULL;
int major, minor;
size_t j;
type = guestfs_inspect_get_type (g, roots[i]);
distro = guestfs_inspect_get_distro (g, roots[i]);
product_name = guestfs_inspect_get_product_name (g, roots[i]);
major = guestfs_inspect_get_major_version (g, roots[i]);
minor = guestfs_inspect_get_minor_version (g, roots[i]);
printf (_("# %s is the root of a %s operating system\n"
"# type: %s, distro: %s, version: %d.%d\n"
"# %s\n\n"),
roots[i], type ? : "unknown",
type ? : "unknown", distro ? : "unknown", major, minor,
product_name ? : "");
mps = guestfs_inspect_get_mountpoints (g, roots[i]);
if (mps == NULL)
exit (EXIT_FAILURE);
/* Sort by key length, shortest key first, so that we end up
* mounting the filesystems in the correct order.
*/
qsort (mps, guestfs_int_count_strings (mps) / 2, 2 * sizeof (char *),
compare_keys_len);
for (j = 0; mps[j] != NULL; j += 2)
printf ("mount %s /sysroot%s\n", mps[j+1], mps[j]);
/* If it's Linux, print the bind-mounts and a chroot command. */
if (type && STREQ (type, "linux")) {
printf ("mount --rbind /dev /sysroot/dev\n");
printf ("mount --rbind /proc /sysroot/proc\n");
printf ("mount --rbind /sys /sysroot/sys\n");
printf ("\n");
printf ("cd /sysroot\n");
printf ("chroot /sysroot\n");
}
printf ("\n");
}
}
/* Inspection failed, so it doesn't contain any OS that we recognise.
* However there might still be filesystems so print some suggestions
* for those.
*/
static void
suggest_filesystems (void)
{
size_t i, count;
CLEANUP_FREE_STRING_LIST char **fses = guestfs_list_filesystems (g);
if (fses == NULL)
exit (EXIT_FAILURE);
/* Count how many are not swap or unknown. Possibly we should try
* mounting to see which are mountable, but that has a high
* probability of breaking.
*/
#define TEST_MOUNTABLE(fs) STRNEQ ((fs), "swap") && STRNEQ ((fs), "unknown")
count = 0;
for (i = 0; fses[i] != NULL; i += 2) {
if (TEST_MOUNTABLE (fses[i+1]))
count++;
}
if (count == 0) {
printf (_("This disk contains no mountable filesystems that we recognize.\n\n"
"However you can still use virt-rescue on the disk image, to try to mount\n"
"filesystems that are not recognized by libguestfs, or to create partitions,\n"
"logical volumes and filesystems on a blank disk.\n"));
return;
}
printf (_("This disk contains one or more filesystems, but we don’t recognize any\n"
"operating system. You can use these mount commands in virt-rescue (at the\n"
"><rescue> prompt) to mount these filesystems.\n\n"));
for (i = 0; fses[i] != NULL; i += 2) {
printf (_("# %s has type ‘%s’\n"), fses[i], fses[i+1]);
if (TEST_MOUNTABLE (fses[i+1]))
printf ("mount %s /sysroot\n", fses[i]);
printf ("\n");
}
#undef TEST_MOUNTABLE
}
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