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 inline void blkid_free_probep(blkid_probe *b) {
56 #define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep)
58 static int verify_gpt_partition(dev_t dev, sd_id128_t *type, unsigned *nr, char **fstype) {
59 _cleanup_free_ char *t = NULL;
60 _cleanup_blkid_freep_probe_ blkid_probe b = NULL;
64 r = asprintf(&t, "/dev/block/%u:%u", major(dev), minor(dev));
69 b = blkid_new_probe_from_filename(t);
71 return errno != 0 ? -errno : -ENOMEM;
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);
79 r = blkid_do_safeprobe(b);
85 return errno ? -errno : -EIO;
88 r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
90 return errno ? -errno : -EIO;
92 if (strcmp(v, "gpt") != 0)
97 r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
99 return errno ? -errno : -EIO;
101 r = sd_id128_from_string(v, type);
108 r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
110 return errno ? -errno : -EIO;
112 r = safe_atou(v, nr);
122 r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
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;
141 log_debug("Adding swap: %s %s", path, fstype);
143 name = unit_name_from_path(path, ".swap");
147 unit = strjoin(arg_dest, "/", name, NULL);
151 f = fopen(unit, "wxe");
153 log_error("Failed to create unit file %s: %m", unit);
158 "# Automatically generated by systemd-gpt-auto-generator\n\n"
160 "DefaultDependencies=no\n"
161 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
162 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_SWAP_TARGET "\n\n"
169 log_error("Failed to write unit file %s: %m", unit);
173 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
177 mkdir_parents_label(lnk, 0755);
178 if (symlink(unit, lnk) < 0) {
179 log_error("Failed to create symlink %s: %m", lnk);
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;
190 if (dir_is_empty("/home") <= 0)
193 log_debug("Adding home: %s %s", path, fstype);
195 unit = strappend(arg_dest, "/home.mount");
199 f = fopen(unit, "wxe");
201 log_error("Failed to create unit file %s: %m", unit);
206 "# Automatically generated by systemd-gpt-auto-generator\n\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"
221 log_error("Failed to write unit file %s: %m", unit);
225 lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL);
230 mkdir_parents_label(lnk, 0755);
231 if (symlink(unit, lnk) < 0) {
232 log_error("Failed to create symlink %s: %m", lnk);
239 static int enumerate_partitions(dev_t dev) {
241 struct udev_enumerate *e = NULL;
242 struct udev_device *parent = NULL, *d = NULL;
243 struct udev_list_entry *first, *item;
244 unsigned home_nr = (unsigned) -1;
245 _cleanup_free_ char *home = NULL, *home_fstype = NULL;
252 e = udev_enumerate_new(udev);
258 d = udev_device_new_from_devnum(udev, 'b', dev);
264 parent = udev_device_get_parent(d);
270 r = udev_enumerate_add_match_parent(e, parent);
276 r = udev_enumerate_add_match_subsystem(e, "block");
282 r = udev_enumerate_scan_devices(e);
284 log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s",
285 major(dev), minor(dev), strerror(-r));
289 first = udev_enumerate_get_list_entry(e);
290 udev_list_entry_foreach(item, first) {
291 _cleanup_free_ char *fstype = NULL;
292 const char *node = NULL;
293 struct udev_device *q;
298 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
304 if (udev_device_get_devnum(q) == udev_device_get_devnum(d))
307 if (udev_device_get_devnum(q) == udev_device_get_devnum(parent))
310 node = udev_device_get_devnode(q);
316 sub = udev_device_get_devnum(q);
318 r = verify_gpt_partition(sub, &type_id, &nr, &fstype);
320 log_error("Failed to verify GPT partition /dev/block/%u:%u: %s",
321 major(sub), minor(sub), strerror(-r));
322 udev_device_unref(q);
328 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)))
329 add_swap(node, fstype);
330 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 if (!home || nr < home_nr) {
343 home_fstype = fstype;
349 udev_device_unref(q);
352 if (home && home_fstype)
353 add_home(home, home_fstype);
357 udev_device_unref(d);
360 udev_enumerate_unref(e);
368 static int get_btrfs_block_device(const char *path, dev_t *dev) {
369 struct btrfs_ioctl_fs_info_args fsi;
370 _cleanup_close_ int fd = -1;
376 fd = open(path, O_DIRECTORY|O_CLOEXEC);
381 if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
384 /* We won't do this for btrfs RAID */
385 if (fsi.num_devices != 1)
388 for (id = 1; id <= fsi.max_id; id++) {
389 struct btrfs_ioctl_dev_info_args di;
395 if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
402 if (stat((char*) di.path, &st) < 0)
405 if (!S_ISBLK(st.st_mode))
408 if (major(st.st_rdev) == 0)
418 static int get_block_device(const char *path, dev_t *dev) {
428 if (major(st.st_dev) != 0) {
433 if (statfs("/", &sfs) < 0)
436 if (F_TYPE_CMP(sfs.f_type, BTRFS_SUPER_MAGIC))
437 return get_btrfs_block_device(path, dev);
442 int main(int argc, char *argv[]) {
446 if (argc > 1 && argc != 4) {
447 log_error("This program takes three or no arguments.");
454 log_set_target(LOG_TARGET_SAFE);
455 log_parse_environment();
463 r = get_block_device("/", &dev);
465 log_error("Failed to determine block device of root file system: %s", strerror(-r));
469 log_debug("Root file system not on a (single) block device.");
473 log_debug("Root device /dev/block/%u:%u.", major(dev), minor(dev));
475 r = verify_gpt_partition(dev, NULL, NULL, NULL);
477 log_error("Failed to verify GPT partition /dev/block/%u:%u: %s",
478 major(dev), minor(dev), strerror(-r));
484 r = enumerate_partitions(dev);
486 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;