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107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* Copyright (c) 2008, XenSource Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Altering operations:
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*
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* 1. Change the parent pointer to another file.
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* 2. Change the size of the file containing the VHD image. This does NOT
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* affect the VHD disk capacity, only the physical size of the file containing
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* the VHD. Naturally, it is not possible to set the file size to be less than
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* the what VHD utilizes.
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* The operation doesn't actually change the file size, but it writes the
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* footer in the right location such that resizing the file (manually, as a
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* separate step) will produce the correct results. If the new file size is
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* greater than the current file size, the file must first be expanded and then
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* altered with this operation. If the new size is smaller than the current
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* size, the VHD must first be altered with this operation and then the file
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* must be shrunk. Failing to resize the file will result in a corrupted VHD.
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*/
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#include <errno.h>
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//#include <fcntl.h>
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#include <stdio.h>
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//#include <stdlib.h>
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#include <unistd.h>
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#include "libvhd.h"
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#include "libvhd-journal.h"
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int
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vhd_util_revert(int argc, char **argv)
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{
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char *name, *jname;
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vhd_journal_t journal;
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int c, err;
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name = NULL;
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jname = NULL;
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optind = 0;
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while ((c = getopt(argc, argv, "n:j:h")) != -1) {
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switch (c) {
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case 'n':
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name = optarg;
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break;
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case 'j':
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jname = optarg;
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break;
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case 'h':
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default:
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goto usage;
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}
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}
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if (!name || !jname || argc != optind)
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goto usage;
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libvhd_set_log_level(1);
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err = vhd_journal_open(&journal, name, jname);
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if (err) {
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printf("opening journal failed: %d\n", err);
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return err;
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}
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err = vhd_journal_revert(&journal);
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if (err) {
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printf("reverting journal failed: %d\n", err);
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vhd_journal_close(&journal);
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return err;
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}
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err = vhd_journal_remove(&journal);
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if (err) {
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printf("removing journal failed: %d\n", err);
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vhd_journal_close(&journal);
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return err;
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}
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return 0;
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usage:
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printf("options: <-n name> <-j journal> [-h help]\n");
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return -EINVAL;
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}
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