Adding upstream version 2.33.1.upstream/2.33.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 839 insertions, 0 deletions

diff --git a/libmount/src/cache.c b/libmount/src/cache.c
new file mode 100644
index 0000000..7adadb8
--- /dev/null
+++ b/libmount/src/cache.c
@@ -0,0 +1,839 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/*
+ * This file is part of libmount from util-linux project.
+ *
+ * Copyright (C) 2009-2018 Karel Zak <kzak@redhat.com>
+ *
+ * libmount is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * SECTION: cache
+ * @title: Cache
+ * @short_description: paths and tags (UUID/LABEL) caching
+ *
+ * The cache is a very simple API for working with tags (LABEL, UUID, ...) and
+ * paths. The cache uses libblkid as a backend for TAGs resolution.
+ *
+ * All returned paths are always canonicalized.
+ */
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <blkid.h>
+
+#include "canonicalize.h"
+#include "mountP.h"
+#include "loopdev.h"
+#include "strutils.h"
+
+/*
+ * Canonicalized (resolved) paths & tags cache
+ */
+#define MNT_CACHE_CHUNKSZ	128
+
+#define MNT_CACHE_ISTAG		(1 << 1) /* entry is TAG */
+#define MNT_CACHE_ISPATH	(1 << 2) /* entry is path */
+#define MNT_CACHE_TAGREAD	(1 << 3) /* tag read by mnt_cache_read_tags() */
+
+/* path cache entry */
+struct mnt_cache_entry {
+	char			*key;	/* search key (e.g. uncanonicalized path) */
+	char			*value;	/* value (e.g. canonicalized path) */
+	int			flag;
+};
+
+struct libmnt_cache {
+	struct mnt_cache_entry	*ents;
+	size_t			nents;
+	size_t			nallocs;
+	int			refcount;
+
+	/* blkid_evaluate_tag() works in two ways:
+	 *
+	 * 1/ all tags are evaluated by udev /dev/disk/by-* symlinks,
+	 *    then the blkid_cache is NULL.
+	 *
+	 * 2/ all tags are read from blkid.tab and verified by /dev
+	 *    scanning, then the blkid_cache is not NULL and then it's
+	 *    better to reuse the blkid_cache.
+	 */
+	blkid_cache		bc;
+
+	struct libmnt_table	*mtab;
+};
+
+/**
+ * mnt_new_cache:
+ *
+ * Returns: new struct libmnt_cache instance or NULL in case of ENOMEM error.
+ */
+struct libmnt_cache *mnt_new_cache(void)
+{
+	struct libmnt_cache *cache = calloc(1, sizeof(*cache));
+	if (!cache)
+		return NULL;
+	DBG(CACHE, ul_debugobj(cache, "alloc"));
+	cache->refcount = 1;
+	return cache;
+}
+
+/**
+ * mnt_free_cache:
+ * @cache: pointer to struct libmnt_cache instance
+ *
+ * Deallocates the cache. This function does not care about reference count. Don't
+ * use this function directly -- it's better to use mnt_unref_cache().
+ */
+void mnt_free_cache(struct libmnt_cache *cache)
+{
+	size_t i;
+
+	if (!cache)
+		return;
+
+	DBG(CACHE, ul_debugobj(cache, "free [refcount=%d]", cache->refcount));
+
+	for (i = 0; i < cache->nents; i++) {
+		struct mnt_cache_entry *e = &cache->ents[i];
+		if (e->value != e->key)
+			free(e->value);
+		free(e->key);
+	}
+	free(cache->ents);
+	if (cache->bc)
+		blkid_put_cache(cache->bc);
+	free(cache);
+}
+
+/**
+ * mnt_ref_cache:
+ * @cache: cache pointer
+ *
+ * Increments reference counter.
+ */
+void mnt_ref_cache(struct libmnt_cache *cache)
+{
+	if (cache) {
+		cache->refcount++;
+		/*DBG(CACHE, ul_debugobj(cache, "ref=%d", cache->refcount));*/
+	}
+}
+
+/**
+ * mnt_unref_cache:
+ * @cache: cache pointer
+ *
+ * De-increments reference counter, on zero the cache is automatically
+ * deallocated by mnt_free_cache().
+ */
+void mnt_unref_cache(struct libmnt_cache *cache)
+{
+	if (cache) {
+		cache->refcount--;
+		/*DBG(CACHE, ul_debugobj(cache, "unref=%d", cache->refcount));*/
+		if (cache->refcount <= 0) {
+			mnt_unref_table(cache->mtab);
+
+			mnt_free_cache(cache);
+		}
+	}
+}
+
+/**
+ * mnt_cache_set_targets:
+ * @cache: cache pointer
+ * @mtab: table with already canonicalized mountpoints
+ *
+ * Add to @cache reference to @mtab. This allows to avoid unnecessary paths
+ * canonicalization in mnt_resolve_target().
+ *
+ * Returns: negative number in case of error, or 0 o success.
+ */
+int mnt_cache_set_targets(struct libmnt_cache *cache,
+				struct libmnt_table *mtab)
+{
+	if (!cache)
+		return -EINVAL;
+
+	mnt_ref_table(mtab);
+	mnt_unref_table(cache->mtab);
+	cache->mtab = mtab;
+	return 0;
+}
+
+
+/* note that the @key could be the same pointer as @value */
+static int cache_add_entry(struct libmnt_cache *cache, char *key,
+					char *value, int flag)
+{
+	struct mnt_cache_entry *e;
+
+	assert(cache);
+	assert(value);
+	assert(key);
+
+	if (cache->nents == cache->nallocs) {
+		size_t sz = cache->nallocs + MNT_CACHE_CHUNKSZ;
+
+		e = realloc(cache->ents, sz * sizeof(struct mnt_cache_entry));
+		if (!e)
+			return -ENOMEM;
+		cache->ents = e;
+		cache->nallocs = sz;
+	}
+
+	e = &cache->ents[cache->nents];
+	e->key = key;
+	e->value = value;
+	e->flag = flag;
+	cache->nents++;
+
+	DBG(CACHE, ul_debugobj(cache, "add entry [%2zd] (%s): %s: %s",
+			cache->nents,
+			(flag & MNT_CACHE_ISPATH) ? "path" : "tag",
+			value, key));
+	return 0;
+}
+
+/* add tag to the cache, @devname has to be an allocated string */
+static int cache_add_tag(struct libmnt_cache *cache, const char *tagname,
+				const char *tagval, char *devname, int flag)
+{
+	size_t tksz, vlsz;
+	char *key;
+	int rc;
+
+	assert(cache);
+	assert(devname);
+	assert(tagname);
+	assert(tagval);
+
+	/* add into cache -- cache format for TAGs is
+	 *	key    = "TAG_NAME\0TAG_VALUE\0"
+	 *	value  = "/dev/foo"
+	 */
+	tksz = strlen(tagname);
+	vlsz = strlen(tagval);
+
+	key = malloc(tksz + vlsz + 2);
+	if (!key)
+		return -ENOMEM;
+
+	memcpy(key, tagname, tksz + 1);	   /* include '\0' */
+	memcpy(key + tksz + 1, tagval, vlsz + 1);
+
+	rc = cache_add_entry(cache, key, devname, flag | MNT_CACHE_ISTAG);
+	if (!rc)
+		return 0;
+
+	free(key);
+	return rc;
+}
+
+
+/*
+ * Returns cached canonicalized path or NULL.
+ */
+static const char *cache_find_path(struct libmnt_cache *cache, const char *path)
+{
+	size_t i;
+
+	if (!cache || !path)
+		return NULL;
+
+	for (i = 0; i < cache->nents; i++) {
+		struct mnt_cache_entry *e = &cache->ents[i];
+		if (!(e->flag & MNT_CACHE_ISPATH))
+			continue;
+		if (streq_paths(path, e->key))
+			return e->value;
+	}
+	return NULL;
+}
+
+/*
+ * Returns cached path or NULL.
+ */
+static const char *cache_find_tag(struct libmnt_cache *cache,
+			const char *token, const char *value)
+{
+	size_t i;
+	size_t tksz;
+
+	if (!cache || !token || !value)
+		return NULL;
+
+	tksz = strlen(token);
+
+	for (i = 0; i < cache->nents; i++) {
+		struct mnt_cache_entry *e = &cache->ents[i];
+		if (!(e->flag & MNT_CACHE_ISTAG))
+			continue;
+		if (strcmp(token, e->key) == 0 &&
+		    strcmp(value, e->key + tksz + 1) == 0)
+			return e->value;
+	}
+	return NULL;
+}
+
+static char *cache_find_tag_value(struct libmnt_cache *cache,
+			const char *devname, const char *token)
+{
+	size_t i;
+
+	assert(cache);
+	assert(devname);
+	assert(token);
+
+	for (i = 0; i < cache->nents; i++) {
+		struct mnt_cache_entry *e = &cache->ents[i];
+		if (!(e->flag & MNT_CACHE_ISTAG))
+			continue;
+		if (strcmp(e->value, devname) == 0 &&	/* dev name */
+		    strcmp(token, e->key) == 0)	/* tag name */
+			return e->key + strlen(token) + 1;	/* tag value */
+	}
+
+	return NULL;
+}
+
+/**
+ * mnt_cache_read_tags
+ * @cache: pointer to struct libmnt_cache instance
+ * @devname: path device
+ *
+ * Reads @devname LABEL and UUID to the @cache.
+ *
+ * Returns: 0 if at least one tag was added, 1 if no tag was added or
+ *          negative number in case of error.
+ */
+int mnt_cache_read_tags(struct libmnt_cache *cache, const char *devname)
+{
+	blkid_probe pr;
+	size_t i, ntags = 0;
+	int rc;
+	const char *tags[] = { "LABEL", "UUID", "TYPE", "PARTUUID", "PARTLABEL" };
+	const char *blktags[] = { "LABEL", "UUID", "TYPE", "PART_ENTRY_UUID", "PART_ENTRY_NAME" };
+
+	if (!cache || !devname)
+		return -EINVAL;
+
+	DBG(CACHE, ul_debugobj(cache, "tags for %s requested", devname));
+
+	/* check if device is already cached */
+	for (i = 0; i < cache->nents; i++) {
+		struct mnt_cache_entry *e = &cache->ents[i];
+		if (!(e->flag & MNT_CACHE_TAGREAD))
+			continue;
+		if (strcmp(e->value, devname) == 0)
+			/* tags have already been read */
+			return 0;
+	}
+
+	pr =  blkid_new_probe_from_filename(devname);
+	if (!pr)
+		return -1;
+
+	blkid_probe_enable_superblocks(pr, 1);
+	blkid_probe_set_superblocks_flags(pr,
+			BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
+			BLKID_SUBLKS_TYPE);
+
+	blkid_probe_enable_partitions(pr, 1);
+	blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
+
+	rc = blkid_do_safeprobe(pr);
+	if (rc)
+		goto error;
+
+	DBG(CACHE, ul_debugobj(cache, "reading tags for: %s", devname));
+
+	for (i = 0; i < ARRAY_SIZE(tags); i++) {
+		const char *data;
+		char *dev;
+
+		if (cache_find_tag_value(cache, devname, tags[i])) {
+			DBG(CACHE, ul_debugobj(cache,
+					"\ntag %s already cached", tags[i]));
+			continue;
+		}
+		if (blkid_probe_lookup_value(pr, blktags[i], &data, NULL))
+			continue;
+		dev = strdup(devname);
+		if (!dev)
+			goto error;
+		if (cache_add_tag(cache, tags[i], data, dev,
+					MNT_CACHE_TAGREAD)) {
+			free(dev);
+			goto error;
+		}
+		ntags++;
+	}
+
+	DBG(CACHE, ul_debugobj(cache, "\tread %zd tags", ntags));
+	blkid_free_probe(pr);
+	return ntags ? 0 : 1;
+error:
+	blkid_free_probe(pr);
+	return rc < 0 ? rc : -1;
+}
+
+/**
+ * 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;
+}
+
+static int __mnt_cache_find_tag_value(struct libmnt_cache *cache,
+		const char *devname, const char *token, char **data)
+{
+	int rc = 0;
+
+	if (!cache || !devname || !token || !data)
+		return -EINVAL;
+
+	rc = mnt_cache_read_tags(cache, devname);
+	if (rc)
+		return rc;
+
+	*data = cache_find_tag_value(cache, devname, token);
+	return *data ? 0 : -1;
+}
+
+/**
+ * mnt_cache_find_tag_value:
+ * @cache: cache for results
+ * @devname: device name
+ * @token: tag name ("LABEL" or "UUID")
+ *
+ * Returns: LABEL or UUID for the @devname or NULL in case of error.
+ */
+char *mnt_cache_find_tag_value(struct libmnt_cache *cache,
+		const char *devname, const char *token)
+{
+	char *data = NULL;
+
+	if (__mnt_cache_find_tag_value(cache, devname, token, &data) == 0)
+		return data;
+	return NULL;
+}
+
+/**
+ * mnt_get_fstype:
+ * @devname: device name
+ * @ambi: returns TRUE if probing result is ambivalent (optional argument)
+ * @cache: cache for results or NULL
+ *
+ * Returns: filesystem type or NULL in case of error. The result has to be
+ * deallocated by free() if @cache is NULL.
+ */
+char *mnt_get_fstype(const char *devname, int *ambi, struct libmnt_cache *cache)
+{
+	blkid_probe pr;
+	const char *data;
+	char *type = NULL;
+	int rc;
+
+	DBG(CACHE, ul_debugobj(cache, "get %s FS type", devname));
+
+	if (cache) {
+		char *val = NULL;
+		rc = __mnt_cache_find_tag_value(cache, devname, "TYPE", &val);
+		if (ambi)
+			*ambi = rc == -2 ? TRUE : FALSE;
+		return rc ? NULL : val;
+	}
+
+	/*
+	 * no cache, probe directly
+	 */
+	pr =  blkid_new_probe_from_filename(devname);
+	if (!pr)
+		return NULL;
+
+	blkid_probe_enable_superblocks(pr, 1);
+	blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_TYPE);
+
+	rc = blkid_do_safeprobe(pr);
+
+	DBG(CACHE, ul_debugobj(cache, "libblkid rc=%d", rc));
+
+	if (!rc && !blkid_probe_lookup_value(pr, "TYPE", &data, NULL))
+		type = strdup(data);
+
+	if (ambi)
+		*ambi = rc == -2 ? TRUE : FALSE;
+
+	blkid_free_probe(pr);
+	return type;
+}
+
+static char *canonicalize_path_and_cache(const char *path,
+						struct libmnt_cache *cache)
+{
+	char *p;
+	char *key;
+	char *value;
+
+	DBG(CACHE, ul_debugobj(cache, "canonicalize path %s", path));
+	p = canonicalize_path(path);
+
+	if (p && cache) {
+		value = p;
+		key = strcmp(path, p) == 0 ? value : strdup(path);
+
+		if (!key || !value)
+			goto error;
+
+		if (cache_add_entry(cache, key, value,
+				MNT_CACHE_ISPATH))
+			goto error;
+	}
+
+	return p;
+error:
+	if (value != key)
+		free(value);
+	free(key);
+	return NULL;
+}
+
+/**
+ * mnt_resolve_path:
+ * @path: "native" path
+ * @cache: cache for results or NULL
+ *
+ * Converts path:
+ *	- to the absolute path
+ *	- /dev/dm-N to /dev/mapper/name
+ *
+ * Returns: absolute path or NULL in case of error. The result has to be
+ * deallocated by free() if @cache is NULL.
+ */
+char *mnt_resolve_path(const char *path, struct libmnt_cache *cache)
+{
+	char *p = NULL;
+
+	/*DBG(CACHE, ul_debugobj(cache, "resolving path %s", path));*/
+
+	if (!path)
+		return NULL;
+	if (cache)
+		p = (char *) cache_find_path(cache, path);
+	if (!p)
+		p = canonicalize_path_and_cache(path, cache);
+
+	return p;
+}
+
+/**
+ * mnt_resolve_target:
+ * @path: "native" path, a potential mount point
+ * @cache: cache for results or NULL.
+ *
+ * Like mnt_resolve_path(), unless @cache is not NULL and
+ * mnt_cache_set_targets(cache, mtab) was called: if @path is found in the
+ * cached @mtab and the matching entry was provided by the kernel, assume that
+ * @path is already canonicalized. By avoiding a call to realpath(2) on
+ * known mount points, there is a lower risk of stepping on a stale mount
+ * point, which can result in an application freeze. This is also faster in
+ * general, as stat(2) on a mount point is slower than on a regular file.
+ *
+ * Returns: absolute path or NULL in case of error. The result has to be
+ * deallocated by free() if @cache is NULL.
+ */
+char *mnt_resolve_target(const char *path, struct libmnt_cache *cache)
+{
+	char *p = NULL;
+
+	/*DBG(CACHE, ul_debugobj(cache, "resolving target %s", path));*/
+
+	if (!cache || !cache->mtab)
+		return mnt_resolve_path(path, cache);
+
+	p = (char *) cache_find_path(cache, path);
+	if (p)
+		return p;
+	else {
+		struct libmnt_iter itr;
+		struct libmnt_fs *fs = NULL;
+
+		mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
+		while (mnt_table_next_fs(cache->mtab, &itr, &fs) == 0) {
+
+			if (!mnt_fs_is_kernel(fs)
+                            || mnt_fs_is_swaparea(fs)
+                            || !mnt_fs_streq_target(fs, path))
+				continue;
+
+			p = strdup(path);
+			if (!p)
+				return NULL;	/* ENOMEM */
+
+			if (cache_add_entry(cache, p, p, MNT_CACHE_ISPATH)) {
+				free(p);
+				return NULL;	/* ENOMEM */
+			}
+			break;
+		}
+	}
+
+	if (!p)
+		p = canonicalize_path_and_cache(path, cache);
+	return p;
+}
+
+/**
+ * mnt_pretty_path:
+ * @path: any path
+ * @cache: NULL or pointer to the cache
+ *
+ * Converts path:
+ *	- to the absolute path
+ *	- /dev/dm-N to /dev/mapper/name
+ *	- /dev/loopN to the loop backing filename
+ *	- empty path (NULL) to 'none'
+ *
+ * Returns: newly allocated string with path, result always has to be deallocated
+ *          by free().
+ */
+char *mnt_pretty_path(const char *path, struct libmnt_cache *cache)
+{
+	char *pretty = mnt_resolve_path(path, cache);
+
+	if (!pretty)
+		return strdup("none");
+
+#ifdef __linux__
+	/* users assume backing file name rather than /dev/loopN in
+	 * output if the device has been initialized by mount(8).
+	 */
+	if (strncmp(pretty, "/dev/loop", 9) == 0) {
+		struct loopdev_cxt lc;
+
+		if (loopcxt_init(&lc, 0) || loopcxt_set_device(&lc, pretty))
+			goto done;
+
+		if (loopcxt_is_autoclear(&lc)) {
+			char *tmp = loopcxt_get_backing_file(&lc);
+			if (tmp) {
+				loopcxt_deinit(&lc);
+				if (!cache)
+					free(pretty);	/* not cached, deallocate */
+				return tmp;		/* return backing file */
+			}
+		}
+		loopcxt_deinit(&lc);
+
+	}
+#endif
+
+done:
+	/* don't return pointer to the cache, allocate a new string */
+	return cache ? strdup(pretty) : pretty;
+}
+
+/**
+ * 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_resolve_spec:
+ * @spec: path or tag
+ * @cache: paths cache
+ *
+ * Returns: canonicalized path or NULL. The result has to be
+ * deallocated by free() if @cache is NULL.
+ */
+char *mnt_resolve_spec(const char *spec, struct libmnt_cache *cache)
+{
+	char *cn = NULL;
+	char *t = NULL, *v = NULL;
+
+	if (!spec)
+		return NULL;
+
+	if (blkid_parse_tag_string(spec, &t, &v) == 0 && mnt_valid_tagname(t))
+		cn = mnt_resolve_tag(t, v, cache);
+	else
+		cn = mnt_resolve_path(spec, cache);
+
+	free(t);
+	free(v);
+	return cn;
+}
+
+
+#ifdef TEST_PROGRAM
+
+static int test_resolve_path(struct libmnt_test *ts, int argc, char *argv[])
+{
+	char line[BUFSIZ];
+	struct libmnt_cache *cache;
+
+	cache = mnt_new_cache();
+	if (!cache)
+		return -ENOMEM;
+
+	while(fgets(line, sizeof(line), stdin)) {
+		size_t sz = strlen(line);
+		char *p;
+
+		if (sz > 0 && line[sz - 1] == '\n')
+			line[sz - 1] = '\0';
+
+		p = mnt_resolve_path(line, cache);
+		printf("%s : %s\n", line, p);
+	}
+	mnt_unref_cache(cache);
+	return 0;
+}
+
+static int test_resolve_spec(struct libmnt_test *ts, int argc, char *argv[])
+{
+	char line[BUFSIZ];
+	struct libmnt_cache *cache;
+
+	cache = mnt_new_cache();
+	if (!cache)
+		return -ENOMEM;
+
+	while(fgets(line, sizeof(line), stdin)) {
+		size_t sz = strlen(line);
+		char *p;
+
+		if (sz > 0 && line[sz - 1] == '\n')
+			line[sz - 1] = '\0';
+
+		p = mnt_resolve_spec(line, cache);
+		printf("%s : %s\n", line, p);
+	}
+	mnt_unref_cache(cache);
+	return 0;
+}
+
+static int test_read_tags(struct libmnt_test *ts, int argc, char *argv[])
+{
+	char line[BUFSIZ];
+	struct libmnt_cache *cache;
+	size_t i;
+
+	cache = mnt_new_cache();
+	if (!cache)
+		return -ENOMEM;
+
+	while(fgets(line, sizeof(line), stdin)) {
+		size_t sz = strlen(line);
+		char *t = NULL, *v = NULL;
+
+		if (sz > 0 && 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 (blkid_parse_tag_string(line, &t, &v) == 0) {
+			const char *cn = NULL;
+
+			if (mnt_valid_tagname(t))
+				cn = cache_find_tag(cache, t, v);
+			free(t);
+			free(v);
+
+			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_unref_cache(cache);
+	return 0;
+
+}
+
+int main(int argc, char *argv[])
+{
+	struct libmnt_test ts[] = {
+		{ "--resolve-path", test_resolve_path, "  resolve paths from stdin" },
+		{ "--resolve-spec", test_resolve_spec, "  evaluate specs from stdin" },
+		{ "--read-tags", test_read_tags,       "  read devname or TAG from stdin (\"quit\" to exit)" },
+		{ NULL }
+	};
+
+	return mnt_run_test(ts, argc, argv);
+}
+#endif