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>
27 #include <blkid/blkid.h>
29 #ifdef HAVE_LINUX_BTRFS_H
30 #include <linux/btrfs.h>
33 #include "path-util.h"
39 #include "udev-util.h"
41 #include "unit-name.h"
46 * - Properly handle cryptsetup partitions
47 * - Define new partition type for encrypted swap
48 * - Make /home automount rather than mount
52 #define GPT_SWAP SD_ID128_MAKE(06,57,fd,6d,a4,ab,43,c4,84,e5,09,33,c8,4b,4f,4f)
53 #define GPT_HOME SD_ID128_MAKE(93,3a,c7,e1,2e,b4,4f,13,b8,44,0e,14,e2,ae,f9,15)
55 static const char *arg_dest = "/tmp";
57 DEFINE_TRIVIAL_CLEANUP_FUNC(blkid_probe, blkid_free_probe);
58 #define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep)
60 static int verify_gpt_partition(const char *node, sd_id128_t *type, unsigned *nr, char **fstype) {
61 _cleanup_blkid_freep_probe_ blkid_probe b = NULL;
66 b = blkid_new_probe_from_filename(node);
68 return errno != 0 ? -errno : -ENOMEM;
70 blkid_probe_enable_superblocks(b, 1);
71 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
72 blkid_probe_enable_partitions(b, 1);
73 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
76 r = blkid_do_safeprobe(b);
82 return errno ? -errno : -EIO;
85 r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
87 /* return 0 if we're not on GPT */
88 return errno ? -errno : 0;
90 if (strcmp(v, "gpt") != 0)
95 r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
97 return errno ? -errno : -EIO;
99 r = sd_id128_from_string(v, type);
106 r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
108 return errno ? -errno : -EIO;
110 r = safe_atou(v, nr);
118 r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
135 static int add_swap(const char *path, const char *fstype) {
136 _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
137 _cleanup_fclose_ FILE *f = NULL;
139 log_debug("Adding swap: %s %s", path, fstype);
141 name = unit_name_from_path(path, ".swap");
145 unit = strjoin(arg_dest, "/", name, NULL);
149 f = fopen(unit, "wxe");
151 log_error("Failed to create unit file %s: %m", unit);
156 "# Automatically generated by systemd-gpt-auto-generator\n\n"
158 "DefaultDependencies=no\n"
159 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
160 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_SWAP_TARGET "\n\n"
167 log_error("Failed to write unit file %s: %m", unit);
171 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
175 mkdir_parents_label(lnk, 0755);
176 if (symlink(unit, lnk) < 0) {
177 log_error("Failed to create symlink %s: %m", lnk);
184 static int add_home(const char *path, const char *fstype) {
185 _cleanup_free_ char *unit = NULL, *lnk = NULL, *fsck = NULL;
186 _cleanup_fclose_ FILE *f = NULL;
188 if (dir_is_empty("/home") <= 0)
191 log_debug("Adding home: %s %s", path, fstype);
193 unit = strappend(arg_dest, "/home.mount");
197 f = fopen(unit, "wxe");
199 log_error("Failed to create unit file %s: %m", unit);
203 fsck = unit_name_from_path_instance("systemd-fsck", path, ".service");
208 "# Automatically generated by systemd-gpt-auto-generator\n\n"
210 "DefaultDependencies=no\n"
212 "After=" SPECIAL_LOCAL_FS_PRE_TARGET " %s\n"
213 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
214 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_LOCAL_FS_TARGET "\n\n"
219 fsck, fsck, path, fstype);
223 log_error("Failed to write unit file %s: %m", unit);
227 lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL);
231 mkdir_parents_label(lnk, 0755);
232 if (symlink(unit, lnk) < 0) {
233 log_error("Failed to create symlink %s: %m", lnk);
240 static int enumerate_partitions(struct udev *udev, dev_t dev) {
241 struct udev_device *parent = NULL;
242 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
243 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
244 struct udev_list_entry *first, *item;
245 unsigned home_nr = (unsigned) -1;
246 _cleanup_free_ char *home = NULL, *home_fstype = NULL;
249 e = udev_enumerate_new(udev);
253 d = udev_device_new_from_devnum(udev, 'b', dev);
257 parent = udev_device_get_parent(d);
261 r = udev_enumerate_add_match_parent(e, parent);
265 r = udev_enumerate_add_match_subsystem(e, "block");
269 r = udev_enumerate_scan_devices(e);
271 log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s",
272 major(dev), minor(dev), strerror(-r));
276 first = udev_enumerate_get_list_entry(e);
277 udev_list_entry_foreach(item, first) {
278 _cleanup_free_ char *fstype = NULL;
279 const char *node = NULL;
280 _cleanup_udev_device_unref_ struct udev_device *q;
284 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
288 if (udev_device_get_devnum(q) == udev_device_get_devnum(d))
291 if (udev_device_get_devnum(q) == udev_device_get_devnum(parent))
294 node = udev_device_get_devnode(q);
298 r = verify_gpt_partition(node, &type_id, &nr, &fstype);
300 log_error("Failed to verify GPT partition %s: %s",
307 if (sd_id128_equal(type_id, GPT_SWAP))
308 add_swap(node, fstype);
309 else if (sd_id128_equal(type_id, GPT_HOME)) {
310 if (!home || nr < home_nr) {
319 home_fstype = fstype;
325 if (home && home_fstype)
326 add_home(home, home_fstype);
331 static int get_btrfs_block_device(const char *path, dev_t *dev) {
332 struct btrfs_ioctl_fs_info_args fsi = {};
333 _cleanup_close_ int fd = -1;
339 fd = open(path, O_DIRECTORY|O_CLOEXEC);
343 if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
346 /* We won't do this for btrfs RAID */
347 if (fsi.num_devices != 1)
350 for (id = 1; id <= fsi.max_id; id++) {
351 struct btrfs_ioctl_dev_info_args di = {
356 if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
363 if (stat((char*) di.path, &st) < 0)
366 if (!S_ISBLK(st.st_mode))
369 if (major(st.st_rdev) == 0)
379 static int get_block_device(const char *path, dev_t *dev) {
389 if (major(st.st_dev) != 0) {
394 if (statfs("/", &sfs) < 0)
397 if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
398 return get_btrfs_block_device(path, dev);
403 static int devno_to_devnode(struct udev *udev, dev_t devno, char **ret) {
404 _cleanup_udev_device_unref_ struct udev_device *d;
408 d = udev_device_new_from_devnum(udev, 'b', devno);
412 t = udev_device_get_devnode(d);
424 int main(int argc, char *argv[]) {
425 _cleanup_free_ char *node = NULL;
426 _cleanup_udev_unref_ struct udev *udev = NULL;
430 if (argc > 1 && argc != 4) {
431 log_error("This program takes three or no arguments.");
439 log_set_target(LOG_TARGET_SAFE);
440 log_parse_environment();
446 log_debug("In initrd, exiting.");
450 if (detect_container(NULL) > 0) {
451 log_debug("In a container, exiting.");
455 r = get_block_device("/", &devno);
457 log_error("Failed to determine block device of root file system: %s", strerror(-r));
461 log_debug("Root file system not on a (single) block device.");
471 r = devno_to_devnode(udev, devno, &node);
473 log_error("Failed to determine block device node from major/minor: %s", strerror(-r));
477 log_debug("Root device %s.", node);
479 r = verify_gpt_partition(node, NULL, NULL, NULL);
481 log_error("Failed to verify GPT partition %s: %s", node, strerror(-r));
487 r = enumerate_partitions(udev, devno);
490 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;