int main(int argc, char *argv[])
{
blkid_probe pr = NULL;
char *uuid = NULL, *label = NULL, *devname;
int c, rc = -1;
static const struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ "label", 1, 0, 'L' },
{ "uuid", 1, 0, 'U' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long(argc, argv, "hVL:U:", longopts, NULL)) != -1) {
switch (c) {
case 'h':
usage(stdout);
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'L':
label = optarg;
break;
case 'U':
#ifdef HAVE_LIBUUID
uuid = optarg;
#else
warnx(_("ignore -U (UUIDs are unsupported)"));
#endif
break;
default:
usage(stderr);
break;
}
}
if (optind == argc)
usage(stderr);
devname = argv[optind];
pr = get_swap_prober(devname);
if (pr) {
if (uuid || label)
rc = change_info(devname, label, uuid);
else
rc = print_info(pr);
blkid_free_probe(pr);
}
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
/*
* This function works like mnt_resolve_tag(), but it's able to read UUiD/LABEL
* from regular swap files too (according to entries in /proc/swaps). Note that
* mnt_resolve_tag() and mnt_resolve_spec() works with system visible block
* devices only.
*/
static char *swapoff_resolve_tag(const char *name, const char *value,
struct libmnt_cache *cache)
{
char *path;
struct libmnt_table *tb;
struct libmnt_iter *itr;
struct libmnt_fs *fs;
/* this is usual case for block devices (and it's really fast as it uses
* udev /dev/disk/by-* symlinks by default */
path = mnt_resolve_tag(name, value, cache);
if (path)
return path;
/* try regular files from /proc/swaps */
tb = get_swaps();
if (!tb)
return NULL;
itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr)
err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
while (tb && mnt_table_next_fs(tb, itr, &fs) == 0) {
blkid_probe pr = NULL;
const char *src = mnt_fs_get_source(fs);
const char *type = mnt_fs_get_swaptype(fs);
const char *data = NULL;
if (!src || !type || strcmp(type, "file") != 0)
continue;
pr = get_swap_prober(src);
if (!pr)
continue;
blkid_probe_lookup_value(pr, name, &data, NULL);
if (data && strcmp(data, value) == 0)
path = xstrdup(src);
blkid_free_probe(pr);
if (path)
break;
}
mnt_free_iter(itr);
return path;
}
