1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
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.
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.
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/>.
25 #include <sys/ioctl.h>
26 #include <sys/statfs.h>
29 #ifdef HAVE_LINUX_BTRFS_H
30 #include <linux/btrfs.h>
33 #include "path-util.h"
40 #include "unit-name.h"
44 * - Properly handle cryptsetup partitions
45 * - Define new partition type for encrypted swap
46 * - Make /home automount rather than mount
50 static const char *arg_dest = "/tmp";
52 static int verify_gpt_partition(dev_t dev, sd_id128_t *type, unsigned *nr, char **fstype) {
53 _cleanup_free_ char *t = NULL;
58 r = asprintf(&t, "/dev/block/%u:%u", major(dev), minor(dev));
63 b = blkid_new_probe_from_filename(t);
71 blkid_probe_enable_superblocks(b, 1);
72 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
73 blkid_probe_enable_partitions(b, 1);
74 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
77 r = blkid_do_safeprobe(b);
85 r = errno ? -errno : -EIO;
90 r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
92 r = errno ? -errno : -EIO;
96 if (strcmp(v, "gpt") != 0) {
103 r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
105 r = errno ? -errno : -EIO;
109 r = sd_id128_from_string(v, type);
116 r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
118 r = errno ? -errno : -EIO;
122 r = safe_atou(v, nr);
132 r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
155 static int add_swap(const char *path, const char *fstype) {
156 _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
157 _cleanup_fclose_ FILE *f = NULL;
159 log_debug("Adding swap: %s %s", path, fstype);
161 name = unit_name_from_path(path, ".swap");
165 unit = strjoin(arg_dest, "/", name, NULL);
169 f = fopen(unit, "wxe");
171 log_error("Failed to create unit file %s: %m", unit);
176 "# Automatically generated by systemd-gpt-auto-generator\n\n"
178 "DefaultDependencies=no\n"
179 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
180 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_SWAP_TARGET "\n\n"
187 log_error("Failed to write unit file %s: %m", unit);
191 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
195 mkdir_parents_label(lnk, 0755);
196 if (symlink(unit, lnk) < 0) {
197 log_error("Failed to create symlink %s: %m", lnk);
204 static int add_home(const char *path, const char *fstype) {
205 _cleanup_free_ char *unit = NULL, *lnk = NULL;
206 _cleanup_fclose_ FILE *f = NULL;
208 if (dir_is_empty("/home") <= 0)
211 log_debug("Adding home: %s %s", path, fstype);
213 unit = strappend(arg_dest, "/home.mount");
217 f = fopen(unit, "wxe");
219 log_error("Failed to create unit file %s: %m", unit);
224 "# Automatically generated by systemd-gpt-auto-generator\n\n"
226 "DefaultDependencies=no\n"
227 "After=" SPECIAL_LOCAL_FS_PRE_TARGET "\n"
228 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
229 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_LOCAL_FS_TARGET "\n\n"
239 log_error("Failed to write unit file %s: %m", unit);
243 lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL);
248 mkdir_parents_label(lnk, 0755);
249 if (symlink(unit, lnk) < 0) {
250 log_error("Failed to create symlink %s: %m", lnk);
257 static int enumerate_partitions(dev_t dev) {
259 struct udev_enumerate *e = NULL;
260 struct udev_device *parent = NULL, *d = NULL;
261 struct udev_list_entry *first, *item;
262 unsigned home_nr = (unsigned) -1;
263 _cleanup_free_ char *home = NULL, *home_fstype = NULL;
270 e = udev_enumerate_new(udev);
276 d = udev_device_new_from_devnum(udev, 'b', dev);
282 parent = udev_device_get_parent(d);
288 r = udev_enumerate_add_match_parent(e, parent);
294 r = udev_enumerate_add_match_subsystem(e, "block");
300 r = udev_enumerate_scan_devices(e);
302 log_error("Failed to enumerate partitions: %s", strerror(-r));
306 first = udev_enumerate_get_list_entry(e);
307 udev_list_entry_foreach(item, first) {
308 _cleanup_free_ char *fstype = NULL;
309 const char *node = NULL;
310 struct udev_device *q;
314 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
320 if (udev_device_get_devnum(q) == udev_device_get_devnum(d))
323 if (udev_device_get_devnum(q) == udev_device_get_devnum(parent))
326 node = udev_device_get_devnode(q);
332 r = verify_gpt_partition(udev_device_get_devnum(q), &type_id, &nr, &fstype);
334 log_error("Failed to verify GPT partition: %s", strerror(-r));
335 udev_device_unref(q);
341 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)))
342 add_swap(node, fstype);
343 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))) {
345 if (!home || nr < home_nr) {
356 home_fstype = fstype;
362 udev_device_unref(q);
365 if (home && home_fstype)
366 add_home(home, home_fstype);
370 udev_device_unref(d);
373 udev_enumerate_unref(e);
381 static int get_btrfs_block_device(const char *path, dev_t *dev) {
382 struct btrfs_ioctl_fs_info_args fsi;
383 _cleanup_close_ int fd = -1;
389 fd = open(path, O_DIRECTORY|O_CLOEXEC);
394 if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
397 /* We won't do this for btrfs RAID */
398 if (fsi.num_devices != 1)
401 for (id = 1; id <= fsi.max_id; id++) {
402 struct btrfs_ioctl_dev_info_args di;
408 if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
415 if (stat((char*) di.path, &st) < 0)
418 if (!S_ISBLK(st.st_mode))
421 if (major(st.st_rdev) == 0)
431 static int get_block_device(const char *path, dev_t *dev) {
441 if (major(st.st_dev) != 0) {
446 if (statfs("/", &sfs) < 0)
449 if (F_TYPE_CMP(sfs.f_type, BTRFS_SUPER_MAGIC))
450 return get_btrfs_block_device(path, dev);
455 int main(int argc, char *argv[]) {
459 if (argc > 1 && argc != 4) {
460 log_error("This program takes three or no arguments.");
467 log_set_target(LOG_TARGET_SAFE);
468 log_parse_environment();
476 r = get_block_device("/", &dev);
478 log_error("Failed to determine block device of root file system: %s", strerror(-r));
482 log_debug("Root file system not on a (single) block device.");
486 log_debug("Root device %u:%u.", major(dev), minor(dev));
488 r = verify_gpt_partition(dev, NULL, NULL, NULL);
490 log_error("Failed to verify GPT partition: %s", strerror(-r));
496 r = enumerate_partitions(dev);
498 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;