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/*
* devname.c --- Support function to translate a user provided string
* identifying a device to an actual device path
*
* Copyright (C) 2022 Red Hat, Inc., Lukas Czerner <lczerner@redhat.com>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "config.h"
#include "devname.h"
#include "nls-enable.h"
/*
* blkid_get_devname() is primarily intended for parsing "NAME=value"
* tokens. It will return the device matching the specified token, NULL if
* nothing is found, or copy of the string if it's not in "NAME=value"
* format.
* get_devname() takes the same parameters and works the same way as
* blkid_get_devname() except it can handle '=' in the file name.
*/
char *get_devname(blkid_cache cache, const char *token, const char *value)
{
int is_file = 0;
char *ret = NULL;
if (!token)
goto out;
if (value) {
ret = blkid_get_devname(cache, token, value);
goto out;
}
if (access(token, F_OK) == 0)
is_file = 1;
ret = blkid_get_devname(cache, token, NULL);
if (ret) {
/*
* In case of collision prefer the result from
* blkid_get_devname() to avoid a file masking file system with
* existing tag.
*/
if (is_file && (strcmp(ret, token) != 0)) {
fprintf(stderr,
_("Collision found: '%s' refers to both '%s' "
"and a file '%s'. Using '%s'!\n"),
token, ret, token, ret);
}
goto out;
}
if (is_file)
ret = strdup(token);
out:
return ret;
}
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