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"
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;
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);
204 "# Automatically generated by systemd-gpt-auto-generator\n\n"
206 "DefaultDependencies=no\n"
207 "After=" SPECIAL_LOCAL_FS_PRE_TARGET "\n"
208 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
209 "Before=" SPECIAL_UMOUNT_TARGET " " SPECIAL_LOCAL_FS_TARGET "\n\n"
219 log_error("Failed to write unit file %s: %m", unit);
223 lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/home.mount", NULL);
228 mkdir_parents_label(lnk, 0755);
229 if (symlink(unit, lnk) < 0) {
230 log_error("Failed to create symlink %s: %m", lnk);
237 static int enumerate_partitions(struct udev *udev, dev_t dev) {
238 struct udev_device *parent = NULL;
239 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
240 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
241 struct udev_list_entry *first, *item;
242 unsigned home_nr = (unsigned) -1;
243 _cleanup_free_ char *home = NULL, *home_fstype = NULL;
246 e = udev_enumerate_new(udev);
250 d = udev_device_new_from_devnum(udev, 'b', dev);
254 parent = udev_device_get_parent(d);
258 r = udev_enumerate_add_match_parent(e, parent);
262 r = udev_enumerate_add_match_subsystem(e, "block");
266 r = udev_enumerate_scan_devices(e);
268 log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s",
269 major(dev), minor(dev), strerror(-r));
273 first = udev_enumerate_get_list_entry(e);
274 udev_list_entry_foreach(item, first) {
275 _cleanup_free_ char *fstype = NULL;
276 const char *node = NULL;
277 _cleanup_udev_device_unref_ struct udev_device *q;
281 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
285 if (udev_device_get_devnum(q) == udev_device_get_devnum(d))
288 if (udev_device_get_devnum(q) == udev_device_get_devnum(parent))
291 node = udev_device_get_devnode(q);
295 r = verify_gpt_partition(node, &type_id, &nr, &fstype);
297 log_error("Failed to verify GPT partition %s: %s",
304 if (sd_id128_equal(type_id, GPT_SWAP))
305 add_swap(node, fstype);
306 else if (sd_id128_equal(type_id, GPT_HOME)) {
307 if (!home || nr < home_nr) {
316 home_fstype = fstype;
322 if (home && home_fstype)
323 add_home(home, home_fstype);
328 static int get_btrfs_block_device(const char *path, dev_t *dev) {
329 struct btrfs_ioctl_fs_info_args fsi = {};
330 _cleanup_close_ int fd = -1;
336 fd = open(path, O_DIRECTORY|O_CLOEXEC);
340 if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
343 /* We won't do this for btrfs RAID */
344 if (fsi.num_devices != 1)
347 for (id = 1; id <= fsi.max_id; id++) {
348 struct btrfs_ioctl_dev_info_args di = {
353 if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
360 if (stat((char*) di.path, &st) < 0)
363 if (!S_ISBLK(st.st_mode))
366 if (major(st.st_rdev) == 0)
376 static int get_block_device(const char *path, dev_t *dev) {
386 if (major(st.st_dev) != 0) {
391 if (statfs("/", &sfs) < 0)
394 if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
395 return get_btrfs_block_device(path, dev);
400 static int devno_to_devnode(struct udev *udev, dev_t devno, char **ret) {
401 _cleanup_udev_device_unref_ struct udev_device *d;
405 d = udev_device_new_from_devnum(udev, 'b', devno);
409 t = udev_device_get_devnode(d);
421 int main(int argc, char *argv[]) {
422 _cleanup_free_ char *node = NULL;
423 _cleanup_udev_unref_ struct udev *udev = NULL;
427 if (argc > 1 && argc != 4) {
428 log_error("This program takes three or no arguments.");
436 log_set_target(LOG_TARGET_SAFE);
437 log_parse_environment();
443 log_debug("In initrd, exiting.");
447 if (detect_container(NULL) > 0) {
448 log_debug("In a container, exiting.");
452 r = get_block_device("/", &devno);
454 log_error("Failed to determine block device of root file system: %s", strerror(-r));
458 log_debug("Root file system not on a (single) block device.");
468 r = devno_to_devnode(udev, devno, &node);
470 log_error("Failed to determine block device node from major/minor: %s", strerror(-r));
474 log_debug("Root device %s.", node);
476 r = verify_gpt_partition(node, NULL, NULL, NULL);
478 log_error("Failed to verify GPT partition %s: %s", node, strerror(-r));
484 r = enumerate_partitions(udev, devno);
487 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;