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Commit | Line | Data |
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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" | |
9a5cb137 | 41 | #include "virt.h" |
1a14a53c LP |
42 | |
43 | /* TODO: | |
44 | * | |
45 | * - Properly handle cryptsetup partitions | |
46 | * - Define new partition type for encrypted swap | |
4b1b14a6 | 47 | * - Make /home automount rather than mount |
1a14a53c LP |
48 | * |
49 | */ | |
50 | ||
b47d419c ZJS |
51 | #define GPT_SWAP SD_ID128_MAKE(06,57,fd,6d,a4,ab,43,c4,84,e5,09,33,c8,4b,4f,4f) |
52 | #define GPT_HOME SD_ID128_MAKE(93,3a,c7,e1,2e,b4,4f,13,b8,44,0e,14,e2,ae,f9,15) | |
53 | ||
1a14a53c LP |
54 | static const char *arg_dest = "/tmp"; |
55 | ||
73841465 ZJS |
56 | static inline void blkid_free_probep(blkid_probe *b) { |
57 | if (*b) | |
58 | blkid_free_probe(*b); | |
59 | } | |
60 | #define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep) | |
61 | ||
3db604b9 | 62 | static int verify_gpt_partition(const char *node, sd_id128_t *type, unsigned *nr, char **fstype) { |
73841465 | 63 | _cleanup_blkid_freep_probe_ blkid_probe b = NULL; |
1a14a53c LP |
64 | const char *v; |
65 | int r; | |
66 | ||
1a14a53c | 67 | errno = 0; |
3db604b9 | 68 | b = blkid_new_probe_from_filename(node); |
73841465 ZJS |
69 | if (!b) |
70 | return errno != 0 ? -errno : -ENOMEM; | |
1a14a53c LP |
71 | |
72 | blkid_probe_enable_superblocks(b, 1); | |
73 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
74 | blkid_probe_enable_partitions(b, 1); | |
75 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
76 | ||
77 | errno = 0; | |
78 | r = blkid_do_safeprobe(b); | |
73841465 ZJS |
79 | if (r == -2) |
80 | return -ENODEV; | |
81 | else if (r == 1) | |
82 | return -ENODEV; | |
83 | else if (r != 0) | |
84 | return errno ? -errno : -EIO; | |
1a14a53c LP |
85 | |
86 | errno = 0; | |
87 | r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL); | |
73841465 | 88 | if (r != 0) |
091526ab ZJS |
89 | /* return 0 if we're not on GPT */ |
90 | return errno ? -errno : 0; | |
1a14a53c | 91 | |
73841465 ZJS |
92 | if (strcmp(v, "gpt") != 0) |
93 | return 0; | |
1a14a53c LP |
94 | |
95 | if (type) { | |
96 | errno = 0; | |
97 | r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); | |
73841465 ZJS |
98 | if (r != 0) |
99 | return errno ? -errno : -EIO; | |
1a14a53c LP |
100 | |
101 | r = sd_id128_from_string(v, type); | |
102 | if (r < 0) | |
103 | return r; | |
104 | } | |
105 | ||
106 | if (nr) { | |
107 | errno = 0; | |
108 | r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL); | |
73841465 ZJS |
109 | if (r != 0) |
110 | return errno ? -errno : -EIO; | |
1a14a53c LP |
111 | |
112 | r = safe_atou(v, nr); | |
113 | if (r < 0) | |
114 | return r; | |
115 | } | |
116 | ||
117 | ||
118 | if (fstype) { | |
1a14a53c LP |
119 | errno = 0; |
120 | r = blkid_probe_lookup_value(b, "TYPE", &v, NULL); | |
121 | if (r != 0) | |
122 | *fstype = NULL; | |
123 | else { | |
b47d419c ZJS |
124 | char *fst; |
125 | ||
1a14a53c | 126 | fst = strdup(v); |
73841465 ZJS |
127 | if (!fst) |
128 | return -ENOMEM; | |
1a14a53c LP |
129 | |
130 | *fstype = fst; | |
131 | } | |
132 | } | |
133 | ||
134 | return 1; | |
1a14a53c LP |
135 | } |
136 | ||
137 | static int add_swap(const char *path, const char *fstype) { | |
138 | _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; | |
139 | _cleanup_fclose_ FILE *f = NULL; | |
140 | ||
141 | log_debug("Adding swap: %s %s", path, fstype); | |
142 | ||
143 | name = unit_name_from_path(path, ".swap"); | |
144 | if (!name) | |
145 | return log_oom(); | |
146 | ||
147 | unit = strjoin(arg_dest, "/", name, NULL); | |
148 | if (!unit) | |
149 | return log_oom(); | |
150 | ||
151 | f = fopen(unit, "wxe"); | |
152 | if (!f) { | |
153 | log_error("Failed to create unit file %s: %m", unit); | |
154 | return -errno; | |
155 | } | |
156 | ||
157 | fprintf(f, | |
158 | "# Automatically generated by systemd-gpt-auto-generator\n\n" | |
159 | "[Unit]\n" | |
160 | "DefaultDependencies=no\n" | |
161 | "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" | |
162 | "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_SWAP_TARGET "\n\n" | |
ee530d8b | 163 | "[Swap]\n" |
1a14a53c LP |
164 | "What=%s\n", |
165 | path); | |
166 | ||
167 | fflush(f); | |
168 | if (ferror(f)) { | |
169 | log_error("Failed to write unit file %s: %m", unit); | |
170 | return -errno; | |
171 | } | |
172 | ||
173 | lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); | |
174 | if (!lnk) | |
175 | return log_oom(); | |
176 | ||
177 | mkdir_parents_label(lnk, 0755); | |
178 | if (symlink(unit, lnk) < 0) { | |
179 | log_error("Failed to create symlink %s: %m", lnk); | |
180 | return -errno; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int add_home(const char *path, const char *fstype) { | |
187 | _cleanup_free_ char *unit = NULL, *lnk = NULL; | |
188 | _cleanup_fclose_ FILE *f = NULL; | |
189 | ||
4b1b14a6 LP |
190 | if (dir_is_empty("/home") <= 0) |
191 | return 0; | |
192 | ||
1a14a53c LP |
193 | log_debug("Adding home: %s %s", path, fstype); |
194 | ||
195 | unit = strappend(arg_dest, "/home.mount"); | |
196 | if (!unit) | |
197 | return log_oom(); | |
198 | ||
199 | f = fopen(unit, "wxe"); | |
200 | if (!f) { | |
201 | log_error("Failed to create unit file %s: %m", unit); | |
202 | return -errno; | |
203 | } | |
204 | ||
205 | fprintf(f, | |
206 | "# Automatically generated by systemd-gpt-auto-generator\n\n" | |
207 | "[Unit]\n" | |
208 | "DefaultDependencies=no\n" | |
209 | "After=" SPECIAL_LOCAL_FS_PRE_TARGET "\n" | |
210 | "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" | |
211 | "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_LOCAL_FS_TARGET "\n\n" | |
212 | "[Mount]\n" | |
213 | "What=%s\n" | |
214 | "Where=/home\n" | |
215 | "Type=%s\n" | |
216 | "FsckPassNo=2\n", | |
217 | path, fstype); | |
218 | ||
219 | fflush(f); | |
220 | if (ferror(f)) { | |
221 | log_error("Failed to write unit file %s: %m", unit); | |
222 | return -errno; | |
223 | } | |
224 | ||
225 | lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL); | |
226 | if (!lnk) | |
227 | return log_oom(); | |
228 | ||
229 | ||
230 | mkdir_parents_label(lnk, 0755); | |
231 | if (symlink(unit, lnk) < 0) { | |
232 | log_error("Failed to create symlink %s: %m", lnk); | |
233 | return -errno; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
3db604b9 | 239 | static int enumerate_partitions(struct udev *udev, dev_t dev) { |
1a14a53c LP |
240 | struct udev_enumerate *e = NULL; |
241 | struct udev_device *parent = NULL, *d = NULL; | |
242 | struct udev_list_entry *first, *item; | |
243 | unsigned home_nr = (unsigned) -1; | |
244 | _cleanup_free_ char *home = NULL, *home_fstype = NULL; | |
245 | int r; | |
246 | ||
1a14a53c | 247 | e = udev_enumerate_new(udev); |
b47d419c ZJS |
248 | if (!e) |
249 | return log_oom(); | |
1a14a53c LP |
250 | |
251 | d = udev_device_new_from_devnum(udev, 'b', dev); | |
252 | if (!d) { | |
253 | r = log_oom(); | |
254 | goto finish; | |
255 | } | |
256 | ||
257 | parent = udev_device_get_parent(d); | |
258 | if (!parent) { | |
259 | r = log_oom(); | |
260 | goto finish; | |
261 | } | |
262 | ||
263 | r = udev_enumerate_add_match_parent(e, parent); | |
264 | if (r < 0) { | |
265 | r = log_oom(); | |
266 | goto finish; | |
267 | } | |
268 | ||
269 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
270 | if (r < 0) { | |
271 | r = log_oom(); | |
272 | goto finish; | |
273 | } | |
274 | ||
275 | r = udev_enumerate_scan_devices(e); | |
276 | if (r < 0) { | |
d98cc1c0 ZJS |
277 | log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s", |
278 | major(dev), minor(dev), strerror(-r)); | |
1a14a53c LP |
279 | goto finish; |
280 | } | |
281 | ||
282 | first = udev_enumerate_get_list_entry(e); | |
283 | udev_list_entry_foreach(item, first) { | |
284 | _cleanup_free_ char *fstype = NULL; | |
285 | const char *node = NULL; | |
286 | struct udev_device *q; | |
287 | sd_id128_t type_id; | |
288 | unsigned nr; | |
289 | ||
290 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
291 | if (!q) { | |
292 | r = log_oom(); | |
293 | goto finish; | |
294 | } | |
295 | ||
296 | if (udev_device_get_devnum(q) == udev_device_get_devnum(d)) | |
297 | goto skip; | |
298 | ||
299 | if (udev_device_get_devnum(q) == udev_device_get_devnum(parent)) | |
300 | goto skip; | |
301 | ||
302 | node = udev_device_get_devnode(q); | |
303 | if (!node) { | |
304 | r = log_oom(); | |
305 | goto finish; | |
306 | } | |
307 | ||
3db604b9 | 308 | r = verify_gpt_partition(node, &type_id, &nr, &fstype); |
1a14a53c | 309 | if (r < 0) { |
3db604b9 LP |
310 | log_error("Failed to verify GPT partition %s: %s", |
311 | node, strerror(-r)); | |
1a14a53c LP |
312 | udev_device_unref(q); |
313 | goto finish; | |
314 | } | |
315 | if (r == 0) | |
316 | goto skip; | |
317 | ||
b47d419c | 318 | if (sd_id128_equal(type_id, GPT_SWAP)) |
1a14a53c | 319 | add_swap(node, fstype); |
b47d419c | 320 | else if (sd_id128_equal(type_id, GPT_HOME)) { |
1a14a53c LP |
321 | if (!home || nr < home_nr) { |
322 | free(home); | |
323 | home = strdup(node); | |
324 | if (!home) { | |
325 | r = log_oom(); | |
326 | goto finish; | |
327 | } | |
328 | ||
329 | home_nr = nr; | |
330 | ||
331 | free(home_fstype); | |
332 | home_fstype = fstype; | |
333 | fstype = NULL; | |
334 | } | |
335 | } | |
336 | ||
337 | skip: | |
338 | udev_device_unref(q); | |
339 | } | |
340 | ||
341 | if (home && home_fstype) | |
342 | add_home(home, home_fstype); | |
343 | ||
344 | finish: | |
345 | if (d) | |
346 | udev_device_unref(d); | |
347 | ||
348 | if (e) | |
349 | udev_enumerate_unref(e); | |
350 | ||
1a14a53c LP |
351 | |
352 | return r; | |
353 | } | |
354 | ||
355 | static int get_btrfs_block_device(const char *path, dev_t *dev) { | |
b47d419c | 356 | struct btrfs_ioctl_fs_info_args fsi = {}; |
1a14a53c LP |
357 | _cleanup_close_ int fd = -1; |
358 | uint64_t id; | |
359 | ||
360 | assert(path); | |
361 | assert(dev); | |
362 | ||
363 | fd = open(path, O_DIRECTORY|O_CLOEXEC); | |
364 | if (fd < 0) | |
365 | return -errno; | |
366 | ||
1a14a53c LP |
367 | if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0) |
368 | return -errno; | |
369 | ||
370 | /* We won't do this for btrfs RAID */ | |
371 | if (fsi.num_devices != 1) | |
372 | return 0; | |
373 | ||
374 | for (id = 1; id <= fsi.max_id; id++) { | |
b47d419c ZJS |
375 | struct btrfs_ioctl_dev_info_args di = { |
376 | .devid = id, | |
377 | }; | |
1a14a53c LP |
378 | struct stat st; |
379 | ||
1a14a53c LP |
380 | if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) { |
381 | if (errno == ENODEV) | |
382 | continue; | |
383 | ||
384 | return -errno; | |
385 | } | |
386 | ||
387 | if (stat((char*) di.path, &st) < 0) | |
388 | return -errno; | |
389 | ||
390 | if (!S_ISBLK(st.st_mode)) | |
391 | return -ENODEV; | |
392 | ||
393 | if (major(st.st_rdev) == 0) | |
394 | return -ENODEV; | |
395 | ||
396 | *dev = st.st_rdev; | |
397 | return 1; | |
398 | } | |
399 | ||
400 | return -ENODEV; | |
401 | } | |
402 | ||
403 | static int get_block_device(const char *path, dev_t *dev) { | |
404 | struct stat st; | |
405 | struct statfs sfs; | |
406 | ||
407 | assert(path); | |
408 | assert(dev); | |
409 | ||
410 | if (lstat("/", &st)) | |
411 | return -errno; | |
412 | ||
413 | if (major(st.st_dev) != 0) { | |
414 | *dev = st.st_dev; | |
415 | return 1; | |
416 | } | |
417 | ||
418 | if (statfs("/", &sfs) < 0) | |
419 | return -errno; | |
420 | ||
c51cf056 | 421 | if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) |
1a14a53c LP |
422 | return get_btrfs_block_device(path, dev); |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
3db604b9 LP |
427 | static int devno_to_devnode(struct udev *udev, dev_t devno, char **ret) { |
428 | struct udev_device *d = NULL; | |
429 | const char *t; | |
430 | char *n; | |
431 | int r; | |
432 | ||
433 | d = udev_device_new_from_devnum(udev, 'b', devno); | |
b47d419c ZJS |
434 | if (!d) |
435 | return log_oom(); | |
3db604b9 LP |
436 | |
437 | t = udev_device_get_devnode(d); | |
438 | if (!t) { | |
439 | r = -ENODEV; | |
440 | goto finish; | |
441 | } | |
442 | ||
443 | n = strdup(t); | |
444 | if (!n) { | |
445 | r = -ENOMEM; | |
446 | goto finish; | |
447 | } | |
448 | ||
449 | *ret = n; | |
450 | r = 0; | |
451 | ||
452 | finish: | |
b47d419c | 453 | udev_device_unref(d); |
3db604b9 LP |
454 | |
455 | return r; | |
456 | } | |
457 | ||
1a14a53c | 458 | int main(int argc, char *argv[]) { |
3db604b9 LP |
459 | _cleanup_free_ char *node = NULL; |
460 | struct udev *udev = NULL; | |
461 | dev_t devno; | |
1a14a53c LP |
462 | int r; |
463 | ||
464 | if (argc > 1 && argc != 4) { | |
465 | log_error("This program takes three or no arguments."); | |
3db604b9 LP |
466 | r = -EINVAL; |
467 | goto finish; | |
1a14a53c LP |
468 | } |
469 | ||
470 | if (argc > 1) | |
471 | arg_dest = argv[3]; | |
472 | ||
473 | log_set_target(LOG_TARGET_SAFE); | |
474 | log_parse_environment(); | |
475 | log_open(); | |
476 | ||
477 | umask(0022); | |
478 | ||
3db604b9 | 479 | if (in_initrd()) { |
9a5cb137 ZJS |
480 | log_debug("In initrd, exiting."); |
481 | r = 0; | |
482 | goto finish; | |
483 | } | |
484 | ||
485 | if (detect_container(NULL) > 0) { | |
486 | log_debug("In a container, exiting."); | |
3db604b9 LP |
487 | r = 0; |
488 | goto finish; | |
489 | } | |
1a14a53c | 490 | |
3db604b9 | 491 | r = get_block_device("/", &devno); |
1a14a53c LP |
492 | if (r < 0) { |
493 | log_error("Failed to determine block device of root file system: %s", strerror(-r)); | |
3db604b9 | 494 | goto finish; |
1a14a53c LP |
495 | } |
496 | if (r == 0) { | |
497 | log_debug("Root file system not on a (single) block device."); | |
3db604b9 LP |
498 | goto finish; |
499 | } | |
500 | ||
501 | udev = udev_new(); | |
502 | if (!udev) { | |
503 | r = log_oom(); | |
504 | goto finish; | |
505 | } | |
506 | ||
507 | r = devno_to_devnode(udev, devno, &node); | |
508 | if (r < 0) { | |
509 | log_error("Failed to determine block device node from major/minor: %s", strerror(-r)); | |
510 | goto finish; | |
1a14a53c LP |
511 | } |
512 | ||
3db604b9 | 513 | log_debug("Root device %s.", node); |
1a14a53c | 514 | |
3db604b9 | 515 | r = verify_gpt_partition(node, NULL, NULL, NULL); |
1a14a53c | 516 | if (r < 0) { |
3db604b9 LP |
517 | log_error("Failed to verify GPT partition %s: %s", node, strerror(-r)); |
518 | goto finish; | |
1a14a53c LP |
519 | } |
520 | if (r == 0) | |
3db604b9 LP |
521 | goto finish; |
522 | ||
523 | r = enumerate_partitions(udev, devno); | |
1a14a53c | 524 | |
3db604b9 LP |
525 | finish: |
526 | if (udev) | |
527 | udev_unref(udev); | |
1a14a53c LP |
528 | |
529 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
530 | } |