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1a14a53c 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 <unistd.h> | |
23 | #include <stdlib.h> | |
24 | #include <fcntl.h> | |
1a14a53c LP |
25 | #include <sys/ioctl.h> |
26 | #include <sys/statfs.h> | |
27 | #include <blkid.h> | |
28 | ||
4b357e15 MM |
29 | #ifdef HAVE_LINUX_BTRFS_H |
30 | #include <linux/btrfs.h> | |
31 | #endif | |
32 | ||
1a14a53c LP |
33 | #include "path-util.h" |
34 | #include "util.h" | |
35 | #include "mkdir.h" | |
36 | #include "missing.h" | |
37 | #include "sd-id128.h" | |
38 | #include "libudev.h" | |
39 | #include "special.h" | |
40 | #include "unit-name.h" | |
41 | ||
42 | /* TODO: | |
43 | * | |
44 | * - Properly handle cryptsetup partitions | |
45 | * - Define new partition type for encrypted swap | |
4b1b14a6 | 46 | * - Make /home automount rather than mount |
1a14a53c LP |
47 | * |
48 | */ | |
49 | ||
50 | static const char *arg_dest = "/tmp"; | |
51 | ||
73841465 ZJS |
52 | static inline void blkid_free_probep(blkid_probe *b) { |
53 | if (*b) | |
54 | blkid_free_probe(*b); | |
55 | } | |
56 | #define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep) | |
57 | ||
1a14a53c LP |
58 | static int verify_gpt_partition(dev_t dev, sd_id128_t *type, unsigned *nr, char **fstype) { |
59 | _cleanup_free_ char *t = NULL; | |
73841465 | 60 | _cleanup_blkid_freep_probe_ blkid_probe b = NULL; |
1a14a53c LP |
61 | const char *v; |
62 | int r; | |
63 | ||
64 | r = asprintf(&t, "/dev/block/%u:%u", major(dev), minor(dev)); | |
65 | if (r < 0) | |
66 | return -ENOMEM; | |
67 | ||
68 | errno = 0; | |
69 | b = blkid_new_probe_from_filename(t); | |
73841465 ZJS |
70 | if (!b) |
71 | return errno != 0 ? -errno : -ENOMEM; | |
1a14a53c LP |
72 | |
73 | blkid_probe_enable_superblocks(b, 1); | |
74 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
75 | blkid_probe_enable_partitions(b, 1); | |
76 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
77 | ||
78 | errno = 0; | |
79 | r = blkid_do_safeprobe(b); | |
73841465 ZJS |
80 | if (r == -2) |
81 | return -ENODEV; | |
82 | else if (r == 1) | |
83 | return -ENODEV; | |
84 | else if (r != 0) | |
85 | return errno ? -errno : -EIO; | |
1a14a53c LP |
86 | |
87 | errno = 0; | |
88 | r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL); | |
73841465 | 89 | if (r != 0) |
091526ab ZJS |
90 | /* return 0 if we're not on GPT */ |
91 | return errno ? -errno : 0; | |
1a14a53c | 92 | |
73841465 ZJS |
93 | if (strcmp(v, "gpt") != 0) |
94 | return 0; | |
1a14a53c LP |
95 | |
96 | if (type) { | |
97 | errno = 0; | |
98 | r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); | |
73841465 ZJS |
99 | if (r != 0) |
100 | return errno ? -errno : -EIO; | |
1a14a53c LP |
101 | |
102 | r = sd_id128_from_string(v, type); | |
103 | if (r < 0) | |
104 | return r; | |
105 | } | |
106 | ||
107 | if (nr) { | |
108 | errno = 0; | |
109 | r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL); | |
73841465 ZJS |
110 | if (r != 0) |
111 | return errno ? -errno : -EIO; | |
1a14a53c LP |
112 | |
113 | r = safe_atou(v, nr); | |
114 | if (r < 0) | |
115 | return r; | |
116 | } | |
117 | ||
118 | ||
119 | if (fstype) { | |
120 | char *fst; | |
121 | ||
122 | errno = 0; | |
123 | r = blkid_probe_lookup_value(b, "TYPE", &v, NULL); | |
124 | if (r != 0) | |
125 | *fstype = NULL; | |
126 | else { | |
127 | fst = strdup(v); | |
73841465 ZJS |
128 | if (!fst) |
129 | return -ENOMEM; | |
1a14a53c LP |
130 | |
131 | *fstype = fst; | |
132 | } | |
133 | } | |
134 | ||
135 | return 1; | |
1a14a53c LP |
136 | } |
137 | ||
138 | static int add_swap(const char *path, const char *fstype) { | |
139 | _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; | |
140 | _cleanup_fclose_ FILE *f = NULL; | |
141 | ||
142 | log_debug("Adding swap: %s %s", path, fstype); | |
143 | ||
144 | name = unit_name_from_path(path, ".swap"); | |
145 | if (!name) | |
146 | return log_oom(); | |
147 | ||
148 | unit = strjoin(arg_dest, "/", name, NULL); | |
149 | if (!unit) | |
150 | return log_oom(); | |
151 | ||
152 | f = fopen(unit, "wxe"); | |
153 | if (!f) { | |
154 | log_error("Failed to create unit file %s: %m", unit); | |
155 | return -errno; | |
156 | } | |
157 | ||
158 | fprintf(f, | |
159 | "# Automatically generated by systemd-gpt-auto-generator\n\n" | |
160 | "[Unit]\n" | |
161 | "DefaultDependencies=no\n" | |
162 | "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" | |
163 | "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_SWAP_TARGET "\n\n" | |
ee530d8b | 164 | "[Swap]\n" |
1a14a53c LP |
165 | "What=%s\n", |
166 | path); | |
167 | ||
168 | fflush(f); | |
169 | if (ferror(f)) { | |
170 | log_error("Failed to write unit file %s: %m", unit); | |
171 | return -errno; | |
172 | } | |
173 | ||
174 | lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); | |
175 | if (!lnk) | |
176 | return log_oom(); | |
177 | ||
178 | mkdir_parents_label(lnk, 0755); | |
179 | if (symlink(unit, lnk) < 0) { | |
180 | log_error("Failed to create symlink %s: %m", lnk); | |
181 | return -errno; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int add_home(const char *path, const char *fstype) { | |
188 | _cleanup_free_ char *unit = NULL, *lnk = NULL; | |
189 | _cleanup_fclose_ FILE *f = NULL; | |
190 | ||
4b1b14a6 LP |
191 | if (dir_is_empty("/home") <= 0) |
192 | return 0; | |
193 | ||
1a14a53c LP |
194 | log_debug("Adding home: %s %s", path, fstype); |
195 | ||
196 | unit = strappend(arg_dest, "/home.mount"); | |
197 | if (!unit) | |
198 | return log_oom(); | |
199 | ||
200 | f = fopen(unit, "wxe"); | |
201 | if (!f) { | |
202 | log_error("Failed to create unit file %s: %m", unit); | |
203 | return -errno; | |
204 | } | |
205 | ||
206 | fprintf(f, | |
207 | "# Automatically generated by systemd-gpt-auto-generator\n\n" | |
208 | "[Unit]\n" | |
209 | "DefaultDependencies=no\n" | |
210 | "After=" SPECIAL_LOCAL_FS_PRE_TARGET "\n" | |
211 | "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" | |
212 | "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_LOCAL_FS_TARGET "\n\n" | |
213 | "[Mount]\n" | |
214 | "What=%s\n" | |
215 | "Where=/home\n" | |
216 | "Type=%s\n" | |
217 | "FsckPassNo=2\n", | |
218 | path, fstype); | |
219 | ||
220 | fflush(f); | |
221 | if (ferror(f)) { | |
222 | log_error("Failed to write unit file %s: %m", unit); | |
223 | return -errno; | |
224 | } | |
225 | ||
226 | lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL); | |
227 | if (!lnk) | |
228 | return log_oom(); | |
229 | ||
230 | ||
231 | mkdir_parents_label(lnk, 0755); | |
232 | if (symlink(unit, lnk) < 0) { | |
233 | log_error("Failed to create symlink %s: %m", lnk); | |
234 | return -errno; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int enumerate_partitions(dev_t dev) { | |
241 | struct udev *udev; | |
242 | struct udev_enumerate *e = NULL; | |
243 | struct udev_device *parent = NULL, *d = NULL; | |
244 | struct udev_list_entry *first, *item; | |
245 | unsigned home_nr = (unsigned) -1; | |
246 | _cleanup_free_ char *home = NULL, *home_fstype = NULL; | |
247 | int r; | |
248 | ||
249 | udev = udev_new(); | |
250 | if (!udev) | |
251 | return log_oom(); | |
252 | ||
253 | e = udev_enumerate_new(udev); | |
254 | if (!e) { | |
255 | r = log_oom(); | |
256 | goto finish; | |
257 | } | |
258 | ||
259 | d = udev_device_new_from_devnum(udev, 'b', dev); | |
260 | if (!d) { | |
261 | r = log_oom(); | |
262 | goto finish; | |
263 | } | |
264 | ||
265 | parent = udev_device_get_parent(d); | |
266 | if (!parent) { | |
267 | r = log_oom(); | |
268 | goto finish; | |
269 | } | |
270 | ||
271 | r = udev_enumerate_add_match_parent(e, parent); | |
272 | if (r < 0) { | |
273 | r = log_oom(); | |
274 | goto finish; | |
275 | } | |
276 | ||
277 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
278 | if (r < 0) { | |
279 | r = log_oom(); | |
280 | goto finish; | |
281 | } | |
282 | ||
283 | r = udev_enumerate_scan_devices(e); | |
284 | if (r < 0) { | |
d98cc1c0 ZJS |
285 | log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s", |
286 | major(dev), minor(dev), strerror(-r)); | |
1a14a53c LP |
287 | goto finish; |
288 | } | |
289 | ||
290 | first = udev_enumerate_get_list_entry(e); | |
291 | udev_list_entry_foreach(item, first) { | |
292 | _cleanup_free_ char *fstype = NULL; | |
293 | const char *node = NULL; | |
294 | struct udev_device *q; | |
295 | sd_id128_t type_id; | |
296 | unsigned nr; | |
d98cc1c0 | 297 | dev_t sub; |
1a14a53c LP |
298 | |
299 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
300 | if (!q) { | |
301 | r = log_oom(); | |
302 | goto finish; | |
303 | } | |
304 | ||
305 | if (udev_device_get_devnum(q) == udev_device_get_devnum(d)) | |
306 | goto skip; | |
307 | ||
308 | if (udev_device_get_devnum(q) == udev_device_get_devnum(parent)) | |
309 | goto skip; | |
310 | ||
311 | node = udev_device_get_devnode(q); | |
312 | if (!node) { | |
313 | r = log_oom(); | |
314 | goto finish; | |
315 | } | |
316 | ||
d98cc1c0 ZJS |
317 | sub = udev_device_get_devnum(q); |
318 | ||
319 | r = verify_gpt_partition(sub, &type_id, &nr, &fstype); | |
1a14a53c | 320 | if (r < 0) { |
d98cc1c0 ZJS |
321 | log_error("Failed to verify GPT partition /dev/block/%u:%u: %s", |
322 | major(sub), minor(sub), strerror(-r)); | |
1a14a53c LP |
323 | udev_device_unref(q); |
324 | goto finish; | |
325 | } | |
326 | if (r == 0) | |
327 | goto skip; | |
328 | ||
329 | if (sd_id128_equal(type_id, SD_ID128_MAKE(06,57,fd,6d,a4,ab,43,c4,84,e5,09,33,c8,4b,4f,4f))) | |
330 | add_swap(node, fstype); | |
331 | else if (sd_id128_equal(type_id, SD_ID128_MAKE(93,3a,c7,e1,2e,b4,4f,13,b8,44,0e,14,e2,ae,f9,15))) { | |
332 | ||
333 | if (!home || nr < home_nr) { | |
334 | free(home); | |
335 | home = strdup(node); | |
336 | if (!home) { | |
337 | r = log_oom(); | |
338 | goto finish; | |
339 | } | |
340 | ||
341 | home_nr = nr; | |
342 | ||
343 | free(home_fstype); | |
344 | home_fstype = fstype; | |
345 | fstype = NULL; | |
346 | } | |
347 | } | |
348 | ||
349 | skip: | |
350 | udev_device_unref(q); | |
351 | } | |
352 | ||
353 | if (home && home_fstype) | |
354 | add_home(home, home_fstype); | |
355 | ||
356 | finish: | |
357 | if (d) | |
358 | udev_device_unref(d); | |
359 | ||
360 | if (e) | |
361 | udev_enumerate_unref(e); | |
362 | ||
363 | if (udev) | |
364 | udev_unref(udev); | |
365 | ||
366 | return r; | |
367 | } | |
368 | ||
369 | static int get_btrfs_block_device(const char *path, dev_t *dev) { | |
370 | struct btrfs_ioctl_fs_info_args fsi; | |
371 | _cleanup_close_ int fd = -1; | |
372 | uint64_t id; | |
373 | ||
374 | assert(path); | |
375 | assert(dev); | |
376 | ||
377 | fd = open(path, O_DIRECTORY|O_CLOEXEC); | |
378 | if (fd < 0) | |
379 | return -errno; | |
380 | ||
381 | zero(fsi); | |
382 | if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0) | |
383 | return -errno; | |
384 | ||
385 | /* We won't do this for btrfs RAID */ | |
386 | if (fsi.num_devices != 1) | |
387 | return 0; | |
388 | ||
389 | for (id = 1; id <= fsi.max_id; id++) { | |
390 | struct btrfs_ioctl_dev_info_args di; | |
391 | struct stat st; | |
392 | ||
393 | zero(di); | |
394 | di.devid = id; | |
395 | ||
396 | if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) { | |
397 | if (errno == ENODEV) | |
398 | continue; | |
399 | ||
400 | return -errno; | |
401 | } | |
402 | ||
403 | if (stat((char*) di.path, &st) < 0) | |
404 | return -errno; | |
405 | ||
406 | if (!S_ISBLK(st.st_mode)) | |
407 | return -ENODEV; | |
408 | ||
409 | if (major(st.st_rdev) == 0) | |
410 | return -ENODEV; | |
411 | ||
412 | *dev = st.st_rdev; | |
413 | return 1; | |
414 | } | |
415 | ||
416 | return -ENODEV; | |
417 | } | |
418 | ||
419 | static int get_block_device(const char *path, dev_t *dev) { | |
420 | struct stat st; | |
421 | struct statfs sfs; | |
422 | ||
423 | assert(path); | |
424 | assert(dev); | |
425 | ||
426 | if (lstat("/", &st)) | |
427 | return -errno; | |
428 | ||
429 | if (major(st.st_dev) != 0) { | |
430 | *dev = st.st_dev; | |
431 | return 1; | |
432 | } | |
433 | ||
434 | if (statfs("/", &sfs) < 0) | |
435 | return -errno; | |
436 | ||
437 | if (F_TYPE_CMP(sfs.f_type, BTRFS_SUPER_MAGIC)) | |
438 | return get_btrfs_block_device(path, dev); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | int main(int argc, char *argv[]) { | |
444 | dev_t dev; | |
445 | int r; | |
446 | ||
447 | if (argc > 1 && argc != 4) { | |
448 | log_error("This program takes three or no arguments."); | |
449 | return EXIT_FAILURE; | |
450 | } | |
451 | ||
452 | if (argc > 1) | |
453 | arg_dest = argv[3]; | |
454 | ||
455 | log_set_target(LOG_TARGET_SAFE); | |
456 | log_parse_environment(); | |
457 | log_open(); | |
458 | ||
459 | umask(0022); | |
460 | ||
461 | if (in_initrd()) | |
462 | return EXIT_SUCCESS; | |
463 | ||
464 | r = get_block_device("/", &dev); | |
465 | if (r < 0) { | |
466 | log_error("Failed to determine block device of root file system: %s", strerror(-r)); | |
467 | return EXIT_FAILURE; | |
468 | } | |
469 | if (r == 0) { | |
470 | log_debug("Root file system not on a (single) block device."); | |
471 | return EXIT_SUCCESS; | |
472 | } | |
473 | ||
d98cc1c0 | 474 | log_debug("Root device /dev/block/%u:%u.", major(dev), minor(dev)); |
1a14a53c LP |
475 | |
476 | r = verify_gpt_partition(dev, NULL, NULL, NULL); | |
477 | if (r < 0) { | |
d98cc1c0 ZJS |
478 | log_error("Failed to verify GPT partition /dev/block/%u:%u: %s", |
479 | major(dev), minor(dev), strerror(-r)); | |
1a14a53c LP |
480 | return EXIT_FAILURE; |
481 | } | |
482 | if (r == 0) | |
483 | return EXIT_SUCCESS; | |
484 | ||
485 | r = enumerate_partitions(dev); | |
486 | ||
487 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
488 | } |