/**
* mnt_resolve_tag:
* @token: tag name
* @value: tag value
* @cache: for results or NULL
*
* Returns: device name or NULL in case of error. The result has to be
* deallocated by free() if @cache is NULL.
*/
char *mnt_resolve_tag(const char *token, const char *value,
struct libmnt_cache *cache)
{
char *p = NULL;
/*DBG(CACHE, ul_debugobj(cache, "resolving tag token=%s value=%s",
token, value));*/
if (!token || !value)
return NULL;
if (cache)
p = (char *) cache_find_tag(cache, token, value);
if (!p) {
/* returns newly allocated string */
p = blkid_evaluate_tag(token, value, cache ? &cache->bc : NULL);
if (p && cache &&
cache_add_tag(cache, token, value, p, 0))
goto error;
}
return p;
error:
free(p);
return NULL;
}
/**
* mnt_cache_device_has_tag:
* @cache: paths cache
* @devname: path to the device
* @token: tag name (e.g "LABEL")
* @value: tag value
*
* Look up @cache to check if @tag+@value are associated with @devname.
*
* Returns: 1 on success or 0.
*/
int mnt_cache_device_has_tag(struct libmnt_cache *cache, const char *devname,
const char *token, const char *value)
{
const char *path = cache_find_tag(cache, token, value);
if (path && devname && strcmp(path, devname) == 0)
return 1;
return 0;
}
int test_read_tags(struct libmnt_test *ts, int argc, char *argv[])
{
char line[BUFSIZ];
struct libmnt_cache *cache;
int i;
cache = mnt_new_cache();
if (!cache)
return -ENOMEM;
while(fgets(line, sizeof(line), stdin)) {
size_t sz = strlen(line);
if (line[sz - 1] == '\n')
line[sz - 1] = '\0';
if (!strcmp(line, "quit"))
break;
if (*line == '/') {
if (mnt_cache_read_tags(cache, line) < 0)
fprintf(stderr, "%s: read tags failed\n", line);
} else if (strchr(line, '=')) {
char *tag, *val;
const char *cn = NULL;
if (!blkid_parse_tag_string(line, &tag, &val)) {
cn = cache_find_tag(cache, tag, val);
free(tag);
free(val);
}
if (cn)
printf("%s: %s\n", line, cn);
else
printf("%s: not cached\n", line);
}
}
for (i = 0; i < cache->nents; i++) {
struct mnt_cache_entry *e = &cache->ents[i];
if (!(e->flag & MNT_CACHE_ISTAG))
continue;
printf("%15s : %5s : %s\n", e->value, e->key,
e->key + strlen(e->key) + 1);
}
mnt_free_cache(cache);
return 0;
}
