Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 1 | /* |
| 2 | * resolve.c - resolve names and tags into specific devices |
| 3 | * |
Theodore Ts'o | 50b380b | 2003-02-12 23:51:21 -0500 | [diff] [blame] | 4 | * Copyright (C) 2001, 2003 Theodore Ts'o. |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 5 | * Copyright (C) 2001 Andreas Dilger |
| 6 | * |
| 7 | * %Begin-Header% |
| 8 | * This file may be redistributed under the terms of the |
| 9 | * GNU Lesser General Public License. |
| 10 | * %End-Header% |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #if HAVE_UNISTD_H |
| 15 | #include <unistd.h> |
| 16 | #endif |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 17 | #include <stdlib.h> |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 18 | #include <fcntl.h> |
| 19 | #include <string.h> |
| 20 | #include <sys/types.h> |
| 21 | #include <sys/stat.h> |
Theodore Ts'o | 7a603aa | 2003-01-26 01:54:39 -0500 | [diff] [blame] | 22 | #include "blkidP.h" |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 23 | #include "probe.h" |
| 24 | |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 25 | /* |
| 26 | * Find a tagname (e.g. LABEL or UUID) on a specific device. |
| 27 | */ |
Theodore Ts'o | 7a603aa | 2003-01-26 01:54:39 -0500 | [diff] [blame] | 28 | char *blkid_get_tagname_devname(blkid_cache cache, const char *tagname, |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 29 | const char *devname) |
| 30 | { |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 31 | blkid_tag found; |
Theodore Ts'o | 7a603aa | 2003-01-26 01:54:39 -0500 | [diff] [blame] | 32 | blkid_dev dev; |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 33 | char *ret = NULL; |
| 34 | |
Theodore Ts'o | f0a22d0 | 2003-02-22 13:19:53 -0500 | [diff] [blame] | 35 | DBG(DEBUG_RESOLVE, printf("looking for %s on %s\n", tagname, devname)); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 36 | |
| 37 | if (!devname) |
| 38 | return NULL; |
| 39 | |
Theodore Ts'o | 98999c3 | 2003-02-16 00:47:07 -0500 | [diff] [blame] | 40 | if ((dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL)) && |
Theodore Ts'o | 50b380b | 2003-02-12 23:51:21 -0500 | [diff] [blame] | 41 | (found = blkid_find_tag_dev(dev, tagname))) |
| 42 | ret = blkid_strdup(found->bit_val); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 43 | |
| 44 | if (!cache) |
| 45 | blkid_free_dev(dev); |
| 46 | |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | /* |
| 51 | * Locate a device name from a token (NAME=value string), or (name, value) |
| 52 | * pair. In the case of a token, value is ignored. If the "token" is not |
| 53 | * of the form "NAME=value" and there is no value given, then it is assumed |
| 54 | * to be the actual devname and a copy is returned. |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 55 | */ |
Theodore Ts'o | 98999c3 | 2003-02-16 00:47:07 -0500 | [diff] [blame] | 56 | char *blkid_get_devname(blkid_cache cache, const char *token, |
| 57 | const char *value) |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 58 | { |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 59 | blkid_dev dev; |
Theodore Ts'o | 7a603aa | 2003-01-26 01:54:39 -0500 | [diff] [blame] | 60 | blkid_cache c = cache; |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 61 | char *t = 0, *v = 0; |
| 62 | char *ret = NULL; |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 63 | |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 64 | if (!token) |
| 65 | return NULL; |
| 66 | |
Theodore Ts'o | f0a22d0 | 2003-02-22 13:19:53 -0500 | [diff] [blame] | 67 | DBG(DEBUG_RESOLVE, |
| 68 | printf("looking for %s%c%s %s\n", token, value ? '=' : ' ', |
Theodore Ts'o | d3f9179 | 2003-01-25 00:26:48 -0500 | [diff] [blame] | 69 | value ? value : "", cache ? "in cache" : "from disk")); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 70 | |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 71 | if (!cache) { |
Theodore Ts'o | 50b380b | 2003-02-12 23:51:21 -0500 | [diff] [blame] | 72 | if (blkid_get_cache(&c, NULL) < 0) |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 73 | return NULL; |
| 74 | } |
| 75 | |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 76 | if (!value) { |
| 77 | blkid_parse_tag_string(token, &t, &v); |
| 78 | if (!t || !v) |
| 79 | goto errout; |
| 80 | token = t; |
| 81 | value = v; |
| 82 | } |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 83 | |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 84 | dev = blkid_find_dev_with_tag(c, token, value); |
| 85 | if (!dev) |
| 86 | goto errout; |
| 87 | |
Theodore Ts'o | 98999c3 | 2003-02-16 00:47:07 -0500 | [diff] [blame] | 88 | ret = blkid_strdup(blkid_dev_devname(dev)); |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 89 | |
| 90 | errout: |
| 91 | if (t) |
| 92 | free(t); |
| 93 | if (v) |
| 94 | free(v); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 95 | if (!cache) { |
Theodore Ts'o | 50b380b | 2003-02-12 23:51:21 -0500 | [diff] [blame] | 96 | blkid_put_cache(c); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 97 | } |
Theodore Ts'o | 76b07bb | 2003-01-27 01:09:24 -0500 | [diff] [blame] | 98 | return (ret); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | #ifdef TEST_PROGRAM |
| 102 | int main(int argc, char **argv) |
| 103 | { |
| 104 | char *value; |
Theodore Ts'o | ce72b86 | 2003-02-14 01:31:45 -0500 | [diff] [blame] | 105 | blkid_cache cache; |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 106 | |
Theodore Ts'o | f0a22d0 | 2003-02-22 13:19:53 -0500 | [diff] [blame] | 107 | blkid_debug_mask = DEBUG_ALL; |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 108 | if (argc != 2 && argc != 3) { |
| 109 | fprintf(stderr, "Usage:\t%s tagname=value\n" |
| 110 | "\t%s tagname devname\n" |
| 111 | "Find which device holds a given token or\n" |
| 112 | "Find what the value of a tag is in a device\n", |
| 113 | argv[0], argv[0]); |
| 114 | exit(1); |
| 115 | } |
Theodore Ts'o | 79dd234 | 2003-02-22 17:15:20 -0500 | [diff] [blame^] | 116 | if (blkid_get_cache(&cache, "/dev/null") < 0) { |
Theodore Ts'o | ce72b86 | 2003-02-14 01:31:45 -0500 | [diff] [blame] | 117 | fprintf(stderr, "Couldn't get blkid cache\n"); |
| 118 | exit(1); |
| 119 | } |
| 120 | |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 121 | if (argv[2]) { |
Theodore Ts'o | ce72b86 | 2003-02-14 01:31:45 -0500 | [diff] [blame] | 122 | value = blkid_get_tagname_devname(cache, argv[1], argv[2]); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 123 | printf("%s has tag %s=%s\n", argv[2], argv[1], |
| 124 | value ? value : "<missing>"); |
| 125 | } else { |
Theodore Ts'o | 98999c3 | 2003-02-16 00:47:07 -0500 | [diff] [blame] | 126 | value = blkid_get_devname(cache, argv[1], NULL); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 127 | printf("%s has tag %s\n", value ? value : "<none>", argv[1]); |
| 128 | } |
Theodore Ts'o | ce72b86 | 2003-02-14 01:31:45 -0500 | [diff] [blame] | 129 | blkid_put_cache(cache); |
Theodore Ts'o | e12f2ae | 2003-01-23 16:45:16 -0500 | [diff] [blame] | 130 | return value ? 0 : 1; |
| 131 | } |
| 132 | #endif |