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/>.
24 #include <sys/statfs.h>
25 #include <blkid/blkid.h>
29 #include "path-util.h"
33 #include "udev-util.h"
35 #include "unit-name.h"
37 #include "generator.h"
41 #include "blkid-util.h"
42 #include "btrfs-util.h"
44 static const char *arg_dest
= "/tmp";
45 static bool arg_enabled
= true;
46 static bool arg_root_enabled
= true;
47 static bool arg_root_rw
= false;
49 static int add_cryptsetup(const char *id
, const char *what
, bool rw
, char **device
) {
50 _cleanup_free_
char *e
= NULL
, *n
= NULL
, *p
= NULL
, *d
= NULL
, *to
= NULL
;
51 _cleanup_fclose_
FILE *f
= NULL
;
59 r
= unit_name_from_path(what
, ".device", &d
);
61 return log_error_errno(r
, "Failed to generate unit name: %m");
63 e
= unit_name_escape(id
);
67 r
= unit_name_build("systemd-cryptsetup", e
, ".service", &n
);
69 return log_error_errno(r
, "Failed to generate unit name: %m");
71 p
= strjoin(arg_dest
, "/", n
, NULL
);
77 return log_error_errno(errno
, "Failed to create unit file %s: %m", p
);
80 "# Automatically generated by systemd-gpt-auto-generator\n\n"
82 "Description=Cryptography Setup for %%I\n"
83 "Documentation=man:systemd-gpt-auto-generator(8) man:systemd-cryptsetup@.service(8)\n"
84 "DefaultDependencies=no\n"
85 "Conflicts=umount.target\n"
86 "BindsTo=dev-mapper-%%i.device %s\n"
87 "Before=umount.target cryptsetup.target\n"
89 "IgnoreOnIsolate=true\n"
92 "RemainAfterExit=yes\n"
93 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
94 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH
" attach '%s' '%s' '' '%s'\n"
95 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH
" detach '%s'\n",
97 id
, what
, rw
? "" : "read-only",
100 r
= fflush_and_check(f
);
102 return log_error_errno(r
, "Failed to write file %s: %m", p
);
104 from
= strjoina("../", n
);
106 to
= strjoin(arg_dest
, "/", d
, ".wants/", n
, NULL
);
110 mkdir_parents_label(to
, 0755);
111 if (symlink(from
, to
) < 0)
112 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
115 to
= strjoin(arg_dest
, "/cryptsetup.target.requires/", n
, NULL
);
119 mkdir_parents_label(to
, 0755);
120 if (symlink(from
, to
) < 0)
121 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
124 to
= strjoin(arg_dest
, "/dev-mapper-", e
, ".device.requires/", n
, NULL
);
128 mkdir_parents_label(to
, 0755);
129 if (symlink(from
, to
) < 0)
130 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
133 p
= strjoin(arg_dest
, "/dev-mapper-", e
, ".device.d/50-job-timeout-sec-0.conf", NULL
);
137 mkdir_parents_label(p
, 0755);
138 r
= write_string_file(p
,
139 "# Automatically generated by systemd-gpt-auto-generator\n\n"
142 WRITE_STRING_FILE_CREATE
); /* the binary handles timeouts anyway */
144 return log_error_errno(r
, "Failed to write device drop-in: %m");
146 ret
= strappend("/dev/mapper/", id
);
154 static int add_mount(
161 const char *description
,
164 _cleanup_free_
char *unit
= NULL
, *lnk
= NULL
, *crypto_what
= NULL
, *p
= NULL
;
165 _cleanup_fclose_
FILE *f
= NULL
;
173 log_debug("Adding %s: %s %s", where
, what
, strna(fstype
));
175 if (streq_ptr(fstype
, "crypto_LUKS")) {
177 r
= add_cryptsetup(id
, what
, rw
, &crypto_what
);
185 r
= unit_name_from_path(where
, ".mount", &unit
);
187 return log_error_errno(r
, "Failed to generate unit name: %m");
189 p
= strjoin(arg_dest
, "/", unit
, NULL
);
195 return log_error_errno(errno
, "Failed to create unit file %s: %m", unit
);
198 "# Automatically generated by systemd-gpt-auto-generator\n\n"
201 "Documentation=man:systemd-gpt-auto-generator(8)\n",
205 fprintf(f
, "Before=%s\n", post
);
207 r
= generator_write_fsck_deps(f
, arg_dest
, what
, where
, fstype
);
219 fprintf(f
, "Type=%s\n", fstype
);
222 fprintf(f
, "Options=%s,%s\n", options
, rw
? "rw" : "ro");
224 fprintf(f
, "Options=%s\n", rw
? "rw" : "ro");
226 r
= fflush_and_check(f
);
228 return log_error_errno(r
, "Failed to write unit file %s: %m", p
);
231 lnk
= strjoin(arg_dest
, "/", post
, ".requires/", unit
, NULL
);
235 mkdir_parents_label(lnk
, 0755);
236 if (symlink(p
, lnk
) < 0)
237 return log_error_errno(errno
, "Failed to create symlink %s: %m", lnk
);
243 static int add_automount(
250 const char *description
,
253 _cleanup_free_
char *unit
= NULL
, *lnk
= NULL
;
254 _cleanup_free_
char *opt
, *p
= NULL
;
255 _cleanup_fclose_
FILE *f
= NULL
;
263 opt
= strjoin(options
, ",noauto", NULL
);
265 opt
= strdup("noauto");
280 r
= unit_name_from_path(where
, ".automount", &unit
);
282 return log_error_errno(r
, "Failed to generate unit name: %m");
284 p
= strjoin(arg_dest
, "/", unit
, NULL
);
290 return log_error_errno(errno
, "Failed to create unit file %s: %m", unit
);
293 "# Automatically generated by systemd-gpt-auto-generator\n\n"
296 "Documentation=man:systemd-gpt-auto-generator(8)\n"
299 "TimeoutIdleSec=%lld\n",
302 (unsigned long long)timeout
/ USEC_PER_SEC
);
304 r
= fflush_and_check(f
);
306 return log_error_errno(r
, "Failed to write unit file %s: %m", p
);
308 lnk
= strjoin(arg_dest
, "/" SPECIAL_LOCAL_FS_TARGET
".wants/", unit
, NULL
);
311 mkdir_parents_label(lnk
, 0755);
313 if (symlink(p
, lnk
) < 0)
314 return log_error_errno(errno
, "Failed to create symlink %s: %m", lnk
);
319 static bool path_is_busy(const char *where
) {
322 /* already a mountpoint; generators run during reload */
323 r
= path_is_mount_point(where
, AT_SYMLINK_FOLLOW
);
327 /* the directory might not exist on a stateless system */
334 /* not a mountpoint but it contains files */
335 if (dir_is_empty(where
) <= 0)
341 static int probe_and_add_mount(
346 const char *description
,
349 _cleanup_blkid_free_probe_ blkid_probe b
= NULL
;
350 const char *fstype
= NULL
;
358 if (path_is_busy(where
)) {
359 log_debug("%s already populated, ignoring.", where
);
363 /* Let's check the partition type here, so that we know
364 * whether to do LUKS magic. */
367 b
= blkid_new_probe_from_filename(what
);
371 log_error_errno(errno
, "Failed to allocate prober: %m");
375 blkid_probe_enable_superblocks(b
, 1);
376 blkid_probe_set_superblocks_flags(b
, BLKID_SUBLKS_TYPE
);
379 r
= blkid_do_safeprobe(b
);
380 if (r
== -2 || r
== 1) /* no result or uncertain */
383 return log_error_errno(errno
?: EIO
, "Failed to probe %s: %m", what
);
385 /* add_mount is OK with fstype being NULL. */
386 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
399 static int add_swap(const char *path
) {
400 _cleanup_free_
char *name
= NULL
, *unit
= NULL
, *lnk
= NULL
;
401 _cleanup_fclose_
FILE *f
= NULL
;
406 log_debug("Adding swap: %s", path
);
408 r
= unit_name_from_path(path
, ".swap", &name
);
410 return log_error_errno(r
, "Failed to generate unit name: %m");
412 unit
= strjoin(arg_dest
, "/", name
, NULL
);
416 f
= fopen(unit
, "wxe");
418 return log_error_errno(errno
, "Failed to create unit file %s: %m", unit
);
421 "# Automatically generated by systemd-gpt-auto-generator\n\n"
423 "Description=Swap Partition\n"
424 "Documentation=man:systemd-gpt-auto-generator(8)\n\n"
429 r
= fflush_and_check(f
);
431 return log_error_errno(r
, "Failed to write unit file %s: %m", unit
);
433 lnk
= strjoin(arg_dest
, "/" SPECIAL_SWAP_TARGET
".wants/", name
, NULL
);
437 mkdir_parents_label(lnk
, 0755);
438 if (symlink(unit
, lnk
) < 0)
439 return log_error_errno(errno
, "Failed to create symlink %s: %m", lnk
);
444 static int add_boot(const char *what
) {
446 _cleanup_blkid_free_probe_ blkid_probe b
= NULL
;
447 const char *fstype
= NULL
, *uuid
= NULL
;
448 sd_id128_t id
, type_id
;
453 if (!is_efi_boot()) {
454 log_debug("Not an EFI boot, ignoring /boot.");
459 log_debug("In initrd, ignoring /boot.");
463 if (detect_container(NULL
) > 0) {
464 log_debug("In a container, ignoring /boot.");
468 if (path_is_busy("/boot")) {
469 log_debug("/boot already populated, ignoring.");
473 r
= efi_loader_get_device_part_uuid(&id
);
475 log_debug("EFI loader partition unknown.");
480 log_error_errno(r
, "Failed to read ESP partition UUID: %m");
485 b
= blkid_new_probe_from_filename(what
);
489 log_error_errno(errno
, "Failed to allocate prober: %m");
493 blkid_probe_enable_partitions(b
, 1);
494 blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
497 r
= blkid_do_safeprobe(b
);
498 if (r
== -2 || r
== 1) /* no result or uncertain */
501 return log_error_errno(errno
?: EIO
, "Failed to probe %s: %m", what
);
503 (void) blkid_probe_lookup_value(b
, "TYPE", &fstype
, NULL
);
504 if (!streq(fstype
, "vfat")) {
505 log_debug("Partition for /boot is not a FAT filesystem, ignoring.");
509 r
= blkid_probe_lookup_value(b
, "PART_ENTRY_UUID", &uuid
, NULL
);
511 log_debug_errno(r
, "Partition for /boot does not have a UUID, ignoring. %m");
515 if (sd_id128_from_string(uuid
, &type_id
) < 0) {
516 log_debug("Partition for /boot does not have a valid UUID, ignoring.");
520 if (!sd_id128_equal(type_id
, id
)) {
521 log_debug("Partition for /boot does not appear to be the partition we are booted from.");
525 r
= add_automount("boot",
529 "EFI System Partition Automount",
540 static int enumerate_partitions(dev_t devnum
) {
542 _cleanup_udev_enumerate_unref_
struct udev_enumerate
*e
= NULL
;
543 _cleanup_udev_device_unref_
struct udev_device
*d
= NULL
;
544 _cleanup_blkid_free_probe_ blkid_probe b
= NULL
;
545 _cleanup_udev_unref_
struct udev
*udev
= NULL
;
546 _cleanup_free_
char *boot
= NULL
, *home
= NULL
, *srv
= NULL
;
547 struct udev_list_entry
*first
, *item
;
548 struct udev_device
*parent
= NULL
;
549 const char *name
, *node
, *pttype
, *devtype
;
550 int boot_nr
= -1, home_nr
= -1, srv_nr
= -1;
551 bool home_rw
= true, srv_rw
= true;
560 d
= udev_device_new_from_devnum(udev
, 'b', devnum
);
564 name
= udev_device_get_devnode(d
);
566 name
= udev_device_get_syspath(d
);
568 log_debug("Device %u:%u does not have a name, ignoring.",
569 major(devnum
), minor(devnum
));
573 parent
= udev_device_get_parent(d
);
575 log_debug("%s: not a partitioned device, ignoring.", name
);
579 /* Does it have a devtype? */
580 devtype
= udev_device_get_devtype(parent
);
582 log_debug("%s: parent doesn't have a device type, ignoring.", name
);
586 /* Is this a disk or a partition? We only care for disks... */
587 if (!streq(devtype
, "disk")) {
588 log_debug("%s: parent isn't a raw disk, ignoring.", name
);
592 /* Does it have a device node? */
593 node
= udev_device_get_devnode(parent
);
595 log_debug("%s: parent device does not have device node, ignoring.", name
);
599 log_debug("%s: root device %s.", name
, node
);
601 pn
= udev_device_get_devnum(parent
);
606 b
= blkid_new_probe_from_filename(node
);
611 return log_error_errno(errno
, "%s: failed to allocate prober: %m", node
);
614 blkid_probe_enable_partitions(b
, 1);
615 blkid_probe_set_partitions_flags(b
, BLKID_PARTS_ENTRY_DETAILS
);
618 r
= blkid_do_safeprobe(b
);
619 if (r
== -2 || r
== 1) /* no result or uncertain */
622 return log_error_errno(errno
?: EIO
, "%s: failed to probe: %m", node
);
625 r
= blkid_probe_lookup_value(b
, "PTTYPE", &pttype
, NULL
);
627 return log_error_errno(errno
?: EIO
,
628 "%s: failed to determine partition table type: %m", node
);
630 /* We only do this all for GPT... */
631 if (!streq_ptr(pttype
, "gpt")) {
632 log_debug("%s: not a GPT partition table, ignoring.", node
);
637 pl
= blkid_probe_get_partitions(b
);
642 return log_error_errno(errno
, "%s: failed to list partitions: %m", node
);
645 e
= udev_enumerate_new(udev
);
649 r
= udev_enumerate_add_match_parent(e
, parent
);
653 r
= udev_enumerate_add_match_subsystem(e
, "block");
657 r
= udev_enumerate_scan_devices(e
);
659 return log_error_errno(r
, "%s: failed to enumerate partitions: %m", node
);
661 first
= udev_enumerate_get_list_entry(e
);
662 udev_list_entry_foreach(item
, first
) {
663 _cleanup_udev_device_unref_
struct udev_device
*q
;
664 const char *stype
, *subnode
;
669 unsigned long long flags
;
671 q
= udev_device_new_from_syspath(udev
, udev_list_entry_get_name(item
));
675 qn
= udev_device_get_devnum(q
);
685 subnode
= udev_device_get_devnode(q
);
689 pp
= blkid_partlist_devno_to_partition(pl
, qn
);
693 flags
= blkid_partition_get_flags(pp
);
695 /* Ignore partitions that are not marked for automatic
696 * mounting on discovery */
697 if (flags
& GPT_FLAG_NO_AUTO
)
700 nr
= blkid_partition_get_partno(pp
);
704 stype
= blkid_partition_get_type_string(pp
);
708 if (sd_id128_from_string(stype
, &type_id
) < 0)
711 if (sd_id128_equal(type_id
, GPT_SWAP
)) {
713 if (flags
& GPT_FLAG_READ_ONLY
) {
714 log_debug("%s marked as read-only swap partition, which is bogus. Ignoring.", subnode
);
718 k
= add_swap(subnode
);
722 } else if (sd_id128_equal(type_id
, GPT_ESP
)) {
724 /* We only care for the first /boot partition */
725 if (boot
&& nr
>= boot_nr
)
730 r
= free_and_strdup(&boot
, subnode
);
734 } else if (sd_id128_equal(type_id
, GPT_HOME
)) {
736 /* We only care for the first /home partition */
737 if (home
&& nr
>= home_nr
)
741 home_rw
= !(flags
& GPT_FLAG_READ_ONLY
),
743 r
= free_and_strdup(&home
, subnode
);
747 } else if (sd_id128_equal(type_id
, GPT_SRV
)) {
749 /* We only care for the first /srv partition */
750 if (srv
&& nr
>= srv_nr
)
754 srv_rw
= !(flags
& GPT_FLAG_READ_ONLY
),
756 r
= free_and_strdup(&srv
, subnode
);
769 k
= probe_and_add_mount("home", home
, "/home", home_rw
, "Home Partition", SPECIAL_LOCAL_FS_TARGET
);
775 k
= probe_and_add_mount("srv", srv
, "/srv", srv_rw
, "Server Data Partition", SPECIAL_LOCAL_FS_TARGET
);
783 static int get_block_device(const char *path
, dev_t
*dev
) {
790 if (lstat(path
, &st
))
793 if (major(st
.st_dev
) != 0) {
798 if (statfs(path
, &sfs
) < 0)
801 if (F_TYPE_EQUAL(sfs
.f_type
, BTRFS_SUPER_MAGIC
))
802 return btrfs_get_block_device(path
, dev
);
807 static int parse_proc_cmdline_item(const char *key
, const char *value
) {
812 if (STR_IN_SET(key
, "systemd.gpt_auto", "rd.systemd.gpt_auto") && value
) {
814 r
= parse_boolean(value
);
816 log_warning("Failed to parse gpt-auto switch \"%s\". Ignoring.", value
);
820 } else if (streq(key
, "root") && value
) {
822 /* Disable root disk logic if there's a root= value
823 * specified (unless it happens to be "gpt-auto") */
825 arg_root_enabled
= streq(value
, "gpt-auto");
827 } else if (streq(key
, "rw") && !value
)
829 else if (streq(key
, "ro") && !value
)
835 static int add_root_mount(void) {
840 if (!is_efi_boot()) {
841 log_debug("Not a EFI boot, not creating root mount.");
845 r
= efi_loader_get_device_part_uuid(NULL
);
847 log_debug("EFI loader partition unknown, exiting.");
850 return log_error_errno(r
, "Failed to read ESP partition UUID: %m");
852 /* OK, we have an ESP partition, this is fantastic, so let's
853 * wait for a root device to show up. A udev rule will create
854 * the link for us under the right name. */
858 "/dev/gpt-auto-root",
859 in_initrd() ? "/sysroot" : "/",
864 in_initrd() ? SPECIAL_INITRD_ROOT_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
);
870 static int add_mounts(void) {
874 r
= get_block_device("/", &devno
);
876 return log_error_errno(r
, "Failed to determine block device of root file system: %m");
878 r
= get_block_device("/usr", &devno
);
880 return log_error_errno(r
, "Failed to determine block device of /usr file system: %m");
882 log_debug("Neither root nor /usr file system are on a (single) block device.");
887 return enumerate_partitions(devno
);
890 int main(int argc
, char *argv
[]) {
893 if (argc
> 1 && argc
!= 4) {
894 log_error("This program takes three or no arguments.");
901 log_set_target(LOG_TARGET_SAFE
);
902 log_parse_environment();
907 if (detect_container(NULL
) > 0) {
908 log_debug("In a container, exiting.");
912 r
= parse_proc_cmdline(parse_proc_cmdline_item
);
914 log_warning_errno(r
, "Failed to parse kernel command line, ignoring: %m");
917 log_debug("Disabled, exiting.");
921 if (arg_root_enabled
)
922 r
= add_root_mount();
932 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;