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cd61c3bf LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/statfs.h> | |
23 | ||
24 | #include "strv.h" | |
25 | #include "utf8.h" | |
26 | #include "btrfs-util.h" | |
ebeccf9e | 27 | #include "path-util.h" |
cd61c3bf | 28 | #include "image.h" |
cd61c3bf | 29 | |
c2ce6a3d LP |
30 | static const char image_search_path[] = |
31 | "/var/lib/container\0" | |
32 | "/var/lib/machine\0"; | |
33 | ||
cd61c3bf LP |
34 | Image *image_unref(Image *i) { |
35 | if (!i) | |
36 | return NULL; | |
37 | ||
38 | free(i->name); | |
39 | free(i->path); | |
40 | free(i); | |
41 | return NULL; | |
42 | } | |
43 | ||
c2ce6a3d | 44 | static int image_new( |
cd61c3bf LP |
45 | ImageType t, |
46 | const char *name, | |
47 | const char *path, | |
48 | bool read_only, | |
10f9c755 | 49 | usec_t crtime, |
cd61c3bf | 50 | usec_t mtime, |
c2ce6a3d | 51 | Image **ret) { |
cd61c3bf LP |
52 | |
53 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 54 | |
cd61c3bf LP |
55 | assert(t >= 0); |
56 | assert(t < _IMAGE_TYPE_MAX); | |
57 | assert(name); | |
c2ce6a3d | 58 | assert(ret); |
cd61c3bf | 59 | |
c2ce6a3d | 60 | i = new0(Image, 1); |
cd61c3bf LP |
61 | if (!i) |
62 | return -ENOMEM; | |
63 | ||
64 | i->type = t; | |
65 | i->read_only = read_only; | |
10f9c755 | 66 | i->crtime = crtime; |
cd61c3bf | 67 | i->mtime = mtime; |
cd61c3bf LP |
68 | |
69 | i->name = strdup(name); | |
70 | if (!i->name) | |
71 | return -ENOMEM; | |
72 | ||
73 | if (path) { | |
ebeccf9e | 74 | i->path = strjoin(path, "/", name, NULL); |
cd61c3bf LP |
75 | if (!i->path) |
76 | return -ENOMEM; | |
ebeccf9e LP |
77 | |
78 | path_kill_slashes(i->path); | |
cd61c3bf LP |
79 | } |
80 | ||
c2ce6a3d | 81 | *ret = i; |
cd61c3bf | 82 | i = NULL; |
c2ce6a3d | 83 | |
cd61c3bf LP |
84 | return 0; |
85 | } | |
86 | ||
c2ce6a3d LP |
87 | static int image_make(int dfd, const char *name, const char *path, Image **ret) { |
88 | struct stat st; | |
86e339c8 | 89 | bool writable; |
cd61c3bf LP |
90 | int r; |
91 | ||
c2ce6a3d LP |
92 | assert(dfd >= 0); |
93 | assert(name); | |
cd61c3bf | 94 | |
c2ce6a3d LP |
95 | /* We explicitly *do* follow symlinks here, since we want to |
96 | * allow symlinking trees into /var/lib/container/, and treat | |
97 | * them normally. */ | |
cd61c3bf | 98 | |
c2ce6a3d LP |
99 | if (fstatat(dfd, name, &st, 0) < 0) |
100 | return -errno; | |
cd61c3bf | 101 | |
86e339c8 LP |
102 | writable = faccessat(dfd, name, W_OK, AT_EACCESS) >= 0; |
103 | ||
c2ce6a3d | 104 | if (S_ISDIR(st.st_mode)) { |
cd61c3bf | 105 | |
c2ce6a3d LP |
106 | if (!ret) |
107 | return 1; | |
cd61c3bf | 108 | |
c2ce6a3d LP |
109 | /* btrfs subvolumes have inode 256 */ |
110 | if (st.st_ino == 256) { | |
111 | _cleanup_close_ int fd = -1; | |
112 | struct statfs sfs; | |
cd61c3bf | 113 | |
c2ce6a3d LP |
114 | fd = openat(dfd, name, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
115 | if (fd < 0) | |
116 | return -errno; | |
cd61c3bf | 117 | |
c2ce6a3d LP |
118 | if (fstatfs(fd, &sfs) < 0) |
119 | return -errno; | |
cd61c3bf | 120 | |
c2ce6a3d | 121 | if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) { |
10f9c755 | 122 | BtrfsSubvolInfo info; |
cd61c3bf | 123 | |
c2ce6a3d | 124 | /* It's a btrfs subvolume */ |
cd61c3bf | 125 | |
10f9c755 LP |
126 | r = btrfs_subvol_get_info_fd(fd, &info); |
127 | if (r < 0) | |
128 | return r; | |
c2ce6a3d LP |
129 | |
130 | r = image_new(IMAGE_SUBVOLUME, | |
131 | name, | |
132 | path, | |
86e339c8 | 133 | info.read_only || !writable, |
10f9c755 | 134 | info.otime, |
c2ce6a3d | 135 | 0, |
c2ce6a3d LP |
136 | ret); |
137 | if (r < 0) | |
138 | return r; | |
139 | ||
140 | return 1; | |
cd61c3bf | 141 | } |
c2ce6a3d | 142 | } |
cd61c3bf | 143 | |
c2ce6a3d | 144 | /* It's just a normal directory. */ |
cd61c3bf | 145 | |
c2ce6a3d LP |
146 | r = image_new(IMAGE_DIRECTORY, |
147 | name, | |
148 | path, | |
86e339c8 | 149 | !writable, |
c2ce6a3d LP |
150 | 0, |
151 | 0, | |
152 | ret); | |
153 | if (r < 0) | |
154 | return r; | |
cd61c3bf | 155 | |
c2ce6a3d | 156 | return 1; |
cd61c3bf | 157 | |
c2ce6a3d | 158 | } else if (S_ISREG(st.st_mode) && endswith(name, ".gpt")) { |
10f9c755 LP |
159 | const char *truncated; |
160 | usec_t crtime = 0; | |
cd61c3bf | 161 | |
c2ce6a3d | 162 | /* It's a GPT block device */ |
cd61c3bf | 163 | |
c2ce6a3d LP |
164 | if (!ret) |
165 | return 1; | |
cd61c3bf | 166 | |
10f9c755 LP |
167 | fd_getcrtime_at(dfd, name, &crtime, 0); |
168 | ||
169 | truncated = strndupa(name, strlen(name) - 4); | |
170 | ||
c2ce6a3d | 171 | r = image_new(IMAGE_GPT, |
10f9c755 | 172 | truncated, |
c2ce6a3d | 173 | path, |
86e339c8 | 174 | !(st.st_mode & 0222) || !writable, |
10f9c755 | 175 | crtime, |
c2ce6a3d | 176 | timespec_load(&st.st_mtim), |
c2ce6a3d LP |
177 | ret); |
178 | if (r < 0) | |
179 | return r; | |
cd61c3bf | 180 | |
c2ce6a3d LP |
181 | return 1; |
182 | } | |
cd61c3bf | 183 | |
c2ce6a3d LP |
184 | return 0; |
185 | } | |
cd61c3bf | 186 | |
c2ce6a3d LP |
187 | int image_find(const char *name, Image **ret) { |
188 | const char *path; | |
189 | int r; | |
cd61c3bf | 190 | |
c2ce6a3d | 191 | assert(name); |
cd61c3bf | 192 | |
c2ce6a3d LP |
193 | /* There are no images with invalid names */ |
194 | if (!image_name_is_valid(name)) | |
195 | return 0; | |
cd61c3bf | 196 | |
c2ce6a3d LP |
197 | NULSTR_FOREACH(path, image_search_path) { |
198 | _cleanup_closedir_ DIR *d = NULL; | |
cd61c3bf | 199 | |
c2ce6a3d LP |
200 | d = opendir(path); |
201 | if (!d) { | |
202 | if (errno == ENOENT) | |
203 | continue; | |
cd61c3bf | 204 | |
c2ce6a3d LP |
205 | return -errno; |
206 | } | |
cd61c3bf | 207 | |
c2ce6a3d LP |
208 | r = image_make(dirfd(d), name, path, ret); |
209 | if (r == 0 || r == -ENOENT) | |
210 | continue; | |
211 | if (r < 0) | |
212 | return r; | |
cd61c3bf | 213 | |
c2ce6a3d LP |
214 | return 1; |
215 | } | |
216 | ||
217 | return 0; | |
218 | }; | |
219 | ||
220 | int image_discover(Hashmap *h) { | |
221 | const char *path; | |
222 | int r; | |
223 | ||
224 | assert(h); | |
225 | ||
226 | NULSTR_FOREACH(path, image_search_path) { | |
227 | _cleanup_closedir_ DIR *d = NULL; | |
228 | struct dirent *de; | |
229 | ||
230 | d = opendir(path); | |
231 | if (!d) { | |
232 | if (errno == ENOENT) | |
233 | return 0; | |
234 | ||
235 | return -errno; | |
236 | } | |
237 | ||
238 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
239 | _cleanup_(image_unrefp) Image *image = NULL; | |
240 | ||
241 | if (!image_name_is_valid(de->d_name)) | |
242 | continue; | |
243 | ||
244 | if (hashmap_contains(h, de->d_name)) | |
245 | continue; | |
246 | ||
247 | r = image_make(dirfd(d), de->d_name, path, &image); | |
248 | if (r == 0 || r == -ENOENT) | |
249 | continue; | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | r = hashmap_put(h, image->name, image); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | image = NULL; | |
cd61c3bf LP |
258 | } |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | void image_hashmap_free(Hashmap *map) { | |
265 | Image *i; | |
266 | ||
267 | while ((i = hashmap_steal_first(map))) | |
268 | image_unref(i); | |
269 | ||
270 | hashmap_free(map); | |
271 | } | |
272 | ||
cd61c3bf LP |
273 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
274 | [IMAGE_DIRECTORY] = "directory", | |
275 | [IMAGE_SUBVOLUME] = "subvolume", | |
276 | [IMAGE_GPT] = "gpt", | |
277 | }; | |
278 | ||
279 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |