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/* guestfish - the filesystem interactive shell
* 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 <inttypes.h>
#include <errno.h>
#include "xstrtol.h"
#include "fish.h"
int
run_alloc (const char *cmd, size_t argc, char *argv[])
{
if (argc != 2) {
fprintf (stderr, _("use 'alloc file size' to create an image\n"));
return -1;
}
if (alloc_disk (argv[0], argv[1], 1, 0) == -1)
return -1;
return 0;
}
int
run_sparse (const char *cmd, size_t argc, char *argv[])
{
if (argc != 2) {
fprintf (stderr, _("use 'sparse file size' to create a sparse image\n"));
return -1;
}
if (alloc_disk (argv[0], argv[1], 1, 1) == -1)
return -1;
return 0;
}
/* This is the underlying allocation function. It's called from
* a few other places in guestfish.
*/
int
alloc_disk (const char *filename, const char *size_str, int add, int sparse)
{
off_t size;
int fd;
char c = 0;
if (parse_size (size_str, &size) == -1)
return -1;
if (!guestfs_is_config (g)) {
fprintf (stderr, _("can't allocate or add disks after launching\n"));
return -1;
}
fd = open (filename, O_WRONLY|O_CREAT|O_NOCTTY|O_TRUNC|O_CLOEXEC, 0666);
if (fd == -1) {
perror (filename);
return -1;
}
if (!sparse) { /* Not sparse */
#ifdef HAVE_POSIX_FALLOCATE
int err = posix_fallocate (fd, 0, size);
if (err != 0) {
errno = err;
perror ("fallocate");
close (fd);
unlink (filename);
return -1;
}
#else
/* Slow emulation of posix_fallocate on platforms which don't have it. */
char buffer[BUFSIZ];
memset (buffer, 0, sizeof buffer);
size_t remaining = size;
while (remaining > 0) {
size_t n = remaining > sizeof buffer ? sizeof buffer : remaining;
ssize_t r = write (fd, buffer, n);
if (r == -1) {
perror ("write");
close (fd);
unlink (filename);
return -1;
}
remaining -= r;
}
#endif
} else { /* Sparse */
if (lseek (fd, size-1, SEEK_SET) == (off_t) -1) {
perror ("lseek");
close (fd);
unlink (filename);
return -1;
}
if (write (fd, &c, 1) != 1) {
perror ("write");
close (fd);
unlink (filename);
return -1;
}
}
if (close (fd) == -1) {
perror (filename);
unlink (filename);
return -1;
}
if (add) {
if (guestfs_add_drive_opts (g, filename,
GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
-1) == -1) {
unlink (filename);
return -1;
}
}
return 0;
}
int
parse_size (const char *str, off_t *size_rtn)
{
unsigned long long size;
strtol_error xerr;
xerr = xstrtoull (str, NULL, 0, &size, "0kKMGTPEZY");
if (xerr != LONGINT_OK) {
fprintf (stderr,
_("%s: invalid integer parameter (%s returned %d)\n"),
"parse_size", "xstrtoull", xerr);
return -1;
}
/* XXX 32 bit file offsets, if anyone uses them? GCC should give
* a warning here anyhow.
*/
*size_rtn = size;
return 0;
}
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