1 /* Copyright (c) 2008, XenSource Inc.
2 * All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution.
11 * * Neither the name of XenSource Inc. nor the names of its contributors
12 * may be used to endorse or promote products derived from this software
13 * without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
19 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
23 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
24 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Altering operations:
28 *
29 * 1. Change the parent pointer to another file.
30 * 2. Change the size of the file containing the VHD image. This does NOT
31 * affect the VHD disk capacity, only the physical size of the file containing
32 * the VHD. Naturally, it is not possible to set the file size to be less than
33 * the what VHD utilizes.
34 * The operation doesn't actually change the file size, but it writes the
35 * footer in the right location such that resizing the file (manually, as a
36 * separate step) will produce the correct results. If the new file size is
37 * greater than the current file size, the file must first be expanded and then
38 * altered with this operation. If the new size is smaller than the current
39 * size, the VHD must first be altered with this operation and then the file
40 * must be shrunk. Failing to resize the file will result in a corrupted VHD.
41 */
42
43 #include <errno.h>
44 //#include <fcntl.h>
45 #include <stdio.h>
46 //#include <stdlib.h>
47 #include <unistd.h>
48
49 #include "libvhd.h"
50 #include "libvhd-journal.h"
51
52 int
vhd_util_revert(int argc,char ** argv)53 vhd_util_revert(int argc, char **argv)
54 {
55 char *name, *jname;
56 vhd_journal_t journal;
57 int c, err;
58
59 name = NULL;
60 jname = NULL;
61
62 optind = 0;
63 while ((c = getopt(argc, argv, "n:j:h")) != -1) {
64 switch (c) {
65 case 'n':
66 name = optarg;
67 break;
68 case 'j':
69 jname = optarg;
70 break;
71 case 'h':
72 default:
73 goto usage;
74 }
75 }
76
77 if (!name || !jname || argc != optind)
78 goto usage;
79
80 libvhd_set_log_level(1);
81 err = vhd_journal_open(&journal, name, jname);
82 if (err) {
83 printf("opening journal failed: %d\n", err);
84 return err;
85 }
86
87 err = vhd_journal_revert(&journal);
88 if (err) {
89 printf("reverting journal failed: %d\n", err);
90 vhd_journal_close(&journal);
91 return err;
92 }
93
94 err = vhd_journal_remove(&journal);
95 if (err) {
96 printf("removing journal failed: %d\n", err);
97 vhd_journal_close(&journal);
98 return err;
99 }
100
101 return 0;
102
103 usage:
104 printf("options: <-n name> <-j journal> [-h help]\n");
105 return -EINVAL;
106 }
107