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/* Copyright (c) 2008, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Altering operations:
*
* 1. Change the parent pointer to another file.
* 2. Change the size of the file containing the VHD image. This does NOT
* affect the VHD disk capacity, only the physical size of the file containing
* the VHD. Naturally, it is not possible to set the file size to be less than
* the what VHD utilizes.
* The operation doesn't actually change the file size, but it writes the
* footer in the right location such that resizing the file (manually, as a
* separate step) will produce the correct results. If the new file size is
* greater than the current file size, the file must first be expanded and then
* altered with this operation. If the new size is smaller than the current
* size, the VHD must first be altered with this operation and then the file
* must be shrunk. Failing to resize the file will result in a corrupted VHD.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "libvhd.h"
TEST_FAIL_EXTERN_VARS;
int
vhd_util_modify(int argc, char **argv)
{
char *name;
vhd_context_t vhd;
int err, c, size, parent, parent_raw;
off64_t newsize = 0;
char *newparent = NULL;
name = NULL;
size = 0;
parent = 0;
parent_raw = 0;
optind = 0;
while ((c = getopt(argc, argv, "n:s:p:mh")) != -1) {
switch (c) {
case 'n':
name = optarg;
break;
case 's':
size = 1;
errno = 0;
newsize = strtoll(optarg, NULL, 10);
if (errno) {
fprintf(stderr, "Invalid size '%s'\n", optarg);
goto usage;
}
break;
case 'p':
parent = 1;
newparent = optarg;
break;
case 'm':
parent_raw = 1;
break;
case 'h':
default:
goto usage;
}
}
if (!name || optind != argc)
goto usage;
err = vhd_open(&vhd, name, VHD_OPEN_RDWR);
if (err) {
printf("error opening %s: %d\n", name, err);
return err;
}
if (size) {
err = vhd_set_phys_size(&vhd, newsize);
if (err)
printf("failed to set physical size to %"PRIu64":"
" %d\n", newsize, err);
}
if (parent) {
TEST_FAIL_AT(FAIL_REPARENT_BEGIN);
err = vhd_change_parent(&vhd, newparent, parent_raw);
if (err) {
printf("failed to set parent to '%s': %d\n",
newparent, err);
goto done;
}
TEST_FAIL_AT(FAIL_REPARENT_END);
}
done:
vhd_close(&vhd);
return err;
usage:
printf("*** Dangerous operations, use with care ***\n");
printf("options: <-n name> [-p NEW_PARENT set parent [-m raw]] "
"[-s NEW_SIZE set size] [-h help]\n");
return -EINVAL;
}
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