/* vi: set sw=4 ts=4: *//* * resolve.c - resolve names and tags into specific devices * * Copyright (C) 2001, 2003 Theodore Ts'o. * Copyright (C) 2001 Andreas Dilger * * %Begin-Header% * This file may be redistributed under the terms of the * GNU Lesser General Public License. * %End-Header% */#include <stdio.h>#ifdef HAVE_UNISTD_H#include <unistd.h>#endif#include <stdlib.h>#include <fcntl.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include "blkidP.h"#include "probe.h"/* * Find a tagname (e.g. LABEL or UUID) on a specific device. */char *blkid_get_tag_value(blkid_cache cache, const char *tagname,			  const char *devname){	blkid_tag found;	blkid_dev dev;	blkid_cache c = cache;	char *ret = NULL;	DBG(DEBUG_RESOLVE, printf("looking for %s on %s\n", tagname, devname));	if (!devname)		return NULL;	if (!cache) {		if (blkid_get_cache(&c, NULL) < 0)			return NULL;	}	if ((dev = blkid_get_dev(c, devname, BLKID_DEV_NORMAL)) &&	    (found = blkid_find_tag_dev(dev, tagname)))		ret = blkid_strdup(found->bit_val);	if (!cache)		blkid_put_cache(c);	return ret;}/* * Locate a device name from a token (NAME=value string), or (name, value) * pair.  In the case of a token, value is ignored.  If the "token" is not * of the form "NAME=value" and there is no value given, then it is assumed * to be the actual devname and a copy is returned. */char *blkid_get_devname(blkid_cache cache, const char *token,			const char *value){	blkid_dev dev;	blkid_cache c = cache;	char *t = 0, *v = 0;	char *ret = NULL;	if (!token)		return NULL;	if (!cache) {		if (blkid_get_cache(&c, NULL) < 0)			return NULL;	}	DBG(DEBUG_RESOLVE,	    printf("looking for %s%s%s %s\n", token, value ? "=" : "",		   value ? value : "", cache ? "in cache" : "from disk"));	if (!value) {		if (!strchr(token, '='))			return blkid_strdup(token);		blkid_parse_tag_string(token, &t, &v);		if (!t || !v)			goto errout;		token = t;		value = v;	}	dev = blkid_find_dev_with_tag(c, token, value);	if (!dev)		goto errout;	ret = blkid_strdup(blkid_dev_devname(dev));errout:	free(t);	free(v);	if (!cache) {		blkid_put_cache(c);	}	return ret;}#ifdef TEST_PROGRAMint main(int argc, char **argv){	char *value;	blkid_cache cache;	blkid_debug_mask = DEBUG_ALL;	if (argc != 2 && argc != 3) {		fprintf(stderr, "Usage:\t%s tagname=value\n"			"\t%s tagname devname\n"			"Find which device holds a given token or\n"			"Find what the value of a tag is in a device\n",			argv[0], argv[0]);		exit(1);	}	if (blkid_get_cache(&cache, bb_dev_null) < 0) {		fprintf(stderr, "cannot get blkid cache\n");		exit(1);	}	if (argv[2]) {		value = blkid_get_tag_value(cache, argv[1], argv[2]);		printf("%s has tag %s=%s\n", argv[2], argv[1],		       value ? value : "<missing>");	} else {		value = blkid_get_devname(cache, argv[1], NULL);		printf("%s has tag %s\n", value ? value : "<none>", argv[1]);	}	blkid_put_cache(cache);	return value ? 0 : 1;}#endif