1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
6 #include <linux/loop.h>
10 #include <sys/ioctl.h>
14 #include "alloc-util.h"
15 #include "btrfs-util.h"
16 #include "chattr-util.h"
18 #include "dirent-util.h"
19 #include "dissect-image.h"
25 #include "hostname-util.h"
26 #include "id128-util.h"
27 #include "lockfile-util.h"
29 #include "loop-util.h"
30 #include "machine-image.h"
33 #include "nulstr-util.h"
35 #include "path-util.h"
37 #include "string-table.h"
38 #include "string-util.h"
40 #include "time-util.h"
42 #include "xattr-util.h"
44 static const char* const image_search_path
[_IMAGE_CLASS_MAX
] = {
45 [IMAGE_MACHINE
] = "/etc/machines\0" /* only place symlinks here */
46 "/run/machines\0" /* and here too */
47 "/var/lib/machines\0" /* the main place for images */
48 "/var/lib/container\0" /* legacy */
49 "/usr/local/lib/machines\0"
50 "/usr/lib/machines\0",
52 [IMAGE_PORTABLE
] = "/etc/portables\0" /* only place symlinks here */
53 "/run/portables\0" /* and here too */
54 "/var/lib/portables\0" /* the main place for images */
55 "/usr/local/lib/portables\0"
56 "/usr/lib/portables\0",
59 static Image
*image_free(Image
*i
) {
66 strv_free(i
->machine_info
);
67 strv_free(i
->os_release
);
72 DEFINE_TRIVIAL_REF_UNREF_FUNC(Image
, image
, image_free
);
73 DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops
, char, string_hash_func
, string_compare_func
,
76 static char **image_settings_path(Image
*image
) {
77 _cleanup_strv_free_
char **l
= NULL
;
87 fn
= strjoina(image
->name
, ".nspawn");
89 FOREACH_STRING(s
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
90 l
[i
] = path_join(s
, fn
);
97 l
[i
] = file_in_same_dir(image
->path
, fn
);
104 static char *image_roothash_path(Image
*image
) {
109 fn
= strjoina(image
->name
, ".roothash");
111 return file_in_same_dir(image
->path
, fn
);
114 static int image_new(
118 const char *filename
,
124 _cleanup_(image_unrefp
) Image
*i
= NULL
;
127 assert(t
< _IMAGE_TYPE_MAX
);
138 i
->read_only
= read_only
;
141 i
->usage
= i
->usage_exclusive
= (uint64_t) -1;
142 i
->limit
= i
->limit_exclusive
= (uint64_t) -1;
144 i
->name
= strdup(pretty
);
148 i
->path
= path_join(path
, filename
);
152 path_simplify(i
->path
, false);
159 static int extract_pretty(const char *path
, const char *suffix
, char **ret
) {
160 _cleanup_free_
char *name
= NULL
;
167 p
= last_path_component(path
);
170 name
= strndup(p
, n
);
177 e
= endswith(name
, suffix
);
184 if (!image_name_is_valid(name
))
187 *ret
= TAKE_PTR(name
);
191 static int image_make(
195 const char *filename
,
196 const struct stat
*st
,
199 _cleanup_free_
char *pretty_buffer
= NULL
, *parent
= NULL
;
204 assert(dfd
>= 0 || dfd
== AT_FDCWD
);
205 assert(path
|| dfd
== AT_FDCWD
);
208 /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block
209 * devices into /var/lib/machines/, and treat them normally.
211 * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we
215 if (fstatat(dfd
, filename
, &stbuf
, 0) < 0)
223 (void) safe_getcwd(&parent
);
225 (void) fd_get_path(dfd
, &parent
);
229 (path
&& path_startswith(path
, "/usr")) ||
230 (faccessat(dfd
, filename
, W_OK
, AT_EACCESS
) < 0 && errno
== EROFS
);
232 if (S_ISDIR(st
->st_mode
)) {
233 _cleanup_close_
int fd
= -1;
234 unsigned file_attr
= 0;
240 r
= extract_pretty(filename
, NULL
, &pretty_buffer
);
244 pretty
= pretty_buffer
;
247 fd
= openat(dfd
, filename
, O_CLOEXEC
|O_NOCTTY
|O_DIRECTORY
);
251 /* btrfs subvolumes have inode 256 */
252 if (st
->st_ino
== 256) {
254 r
= btrfs_is_filesystem(fd
);
258 BtrfsSubvolInfo info
;
260 /* It's a btrfs subvolume */
262 r
= btrfs_subvol_get_info_fd(fd
, 0, &info
);
266 r
= image_new(IMAGE_SUBVOLUME
,
270 info
.read_only
|| read_only
,
277 if (btrfs_quota_scan_ongoing(fd
) == 0) {
278 BtrfsQuotaInfo quota
;
280 r
= btrfs_subvol_get_subtree_quota_fd(fd
, 0, "a
);
282 (*ret
)->usage
= quota
.referenced
;
283 (*ret
)->usage_exclusive
= quota
.exclusive
;
285 (*ret
)->limit
= quota
.referenced_max
;
286 (*ret
)->limit_exclusive
= quota
.exclusive_max
;
294 /* If the IMMUTABLE bit is set, we consider the
295 * directory read-only. Since the ioctl is not
296 * supported everywhere we ignore failures. */
297 (void) read_attr_fd(fd
, &file_attr
);
299 /* It's just a normal directory. */
300 r
= image_new(IMAGE_DIRECTORY
,
304 read_only
|| (file_attr
& FS_IMMUTABLE_FL
),
313 } else if (S_ISREG(st
->st_mode
) && endswith(filename
, ".raw")) {
316 /* It's a RAW disk image */
321 (void) fd_getcrtime_at(dfd
, filename
, &crtime
, 0);
324 r
= extract_pretty(filename
, ".raw", &pretty_buffer
);
328 pretty
= pretty_buffer
;
331 r
= image_new(IMAGE_RAW
,
335 !(st
->st_mode
& 0222) || read_only
,
337 timespec_load(&st
->st_mtim
),
342 (*ret
)->usage
= (*ret
)->usage_exclusive
= st
->st_blocks
* 512;
343 (*ret
)->limit
= (*ret
)->limit_exclusive
= st
->st_size
;
347 } else if (S_ISBLK(st
->st_mode
)) {
348 _cleanup_close_
int block_fd
= -1;
349 uint64_t size
= UINT64_MAX
;
357 r
= extract_pretty(filename
, NULL
, &pretty_buffer
);
361 pretty
= pretty_buffer
;
364 block_fd
= openat(dfd
, filename
, O_RDONLY
|O_NONBLOCK
|O_CLOEXEC
|O_NOCTTY
);
366 log_debug_errno(errno
, "Failed to open block device %s/%s, ignoring: %m", path
?: strnull(parent
), filename
);
368 /* Refresh stat data after opening the node */
369 if (fstat(block_fd
, &stbuf
) < 0)
373 if (!S_ISBLK(st
->st_mode
)) /* Verify that what we opened is actually what we think it is */
379 if (ioctl(block_fd
, BLKROGET
, &state
) < 0)
380 log_debug_errno(errno
, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path
?: strnull(parent
), filename
);
385 if (ioctl(block_fd
, BLKGETSIZE64
, &size
) < 0)
386 log_debug_errno(errno
, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path
?: strnull(parent
), filename
);
388 block_fd
= safe_close(block_fd
);
391 r
= image_new(IMAGE_BLOCK
,
395 !(st
->st_mode
& 0222) || read_only
,
402 if (!IN_SET(size
, 0, UINT64_MAX
))
403 (*ret
)->usage
= (*ret
)->usage_exclusive
= (*ret
)->limit
= (*ret
)->limit_exclusive
= size
;
411 int image_find(ImageClass
class, const char *name
, Image
**ret
) {
416 assert(class < _IMAGE_CLASS_MAX
);
419 /* There are no images with invalid names */
420 if (!image_name_is_valid(name
))
423 NULSTR_FOREACH(path
, image_search_path
[class]) {
424 _cleanup_closedir_
DIR *d
= NULL
;
435 /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to
436 * symlink block devices into the search path */
437 if (fstatat(dirfd(d
), name
, &st
, 0) < 0) {
438 _cleanup_free_
char *raw
= NULL
;
443 raw
= strjoin(name
, ".raw");
447 if (fstatat(dirfd(d
), raw
, &st
, 0) < 0) {
455 if (!S_ISREG(st
.st_mode
))
458 r
= image_make(name
, dirfd(d
), path
, raw
, &st
, ret
);
461 if (!S_ISDIR(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
464 r
= image_make(name
, dirfd(d
), path
, name
, &st
, ret
);
466 if (IN_SET(r
, -ENOENT
, -EMEDIUMTYPE
))
472 (*ret
)->discoverable
= true;
477 if (class == IMAGE_MACHINE
&& streq(name
, ".host")) {
478 r
= image_make(".host", AT_FDCWD
, NULL
, "/", NULL
, ret
);
483 (*ret
)->discoverable
= true;
491 int image_from_path(const char *path
, Image
**ret
) {
493 /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether
494 * the image is in the image search path. And if it is we don't know if the path we used is actually not
495 * overridden by another, different image earlier in the search path */
497 if (path_equal(path
, "/"))
498 return image_make(".host", AT_FDCWD
, NULL
, "/", NULL
, ret
);
500 return image_make(NULL
, AT_FDCWD
, NULL
, path
, NULL
, ret
);
503 int image_find_harder(ImageClass
class, const char *name_or_path
, Image
**ret
) {
504 if (image_name_is_valid(name_or_path
))
505 return image_find(class, name_or_path
, ret
);
507 return image_from_path(name_or_path
, ret
);
510 int image_discover(ImageClass
class, Hashmap
*h
) {
515 assert(class < _IMAGE_CLASS_MAX
);
518 NULSTR_FOREACH(path
, image_search_path
[class]) {
519 _cleanup_closedir_
DIR *d
= NULL
;
530 FOREACH_DIRENT_ALL(de
, d
, return -errno
) {
531 _cleanup_(image_unrefp
) Image
*image
= NULL
;
532 _cleanup_free_
char *truncated
= NULL
;
536 if (dot_or_dot_dot(de
->d_name
))
539 /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people
540 * to symlink block devices into the search path */
541 if (fstatat(dirfd(d
), de
->d_name
, &st
, 0) < 0) {
548 if (S_ISREG(st
.st_mode
)) {
551 e
= endswith(de
->d_name
, ".raw");
555 truncated
= strndup(de
->d_name
, e
- de
->d_name
);
560 } else if (S_ISDIR(st
.st_mode
) || S_ISBLK(st
.st_mode
))
565 if (!image_name_is_valid(pretty
))
568 if (hashmap_contains(h
, pretty
))
571 r
= image_make(pretty
, dirfd(d
), path
, de
->d_name
, &st
, &image
);
572 if (IN_SET(r
, -ENOENT
, -EMEDIUMTYPE
))
577 image
->discoverable
= true;
579 r
= hashmap_put(h
, image
->name
, image
);
587 if (class == IMAGE_MACHINE
&& !hashmap_contains(h
, ".host")) {
588 _cleanup_(image_unrefp
) Image
*image
= NULL
;
590 r
= image_make(".host", AT_FDCWD
, NULL
, "/", NULL
, &image
);
594 image
->discoverable
= true;
596 r
= hashmap_put(h
, image
->name
, image
);
606 int image_remove(Image
*i
) {
607 _cleanup_(release_lock_file
) LockFile global_lock
= LOCK_FILE_INIT
, local_lock
= LOCK_FILE_INIT
;
608 _cleanup_strv_free_
char **settings
= NULL
;
609 _cleanup_free_
char *roothash
= NULL
;
615 if (IMAGE_IS_VENDOR(i
) || IMAGE_IS_HOST(i
))
618 settings
= image_settings_path(i
);
622 roothash
= image_roothash_path(i
);
626 /* Make sure we don't interfere with a running nspawn */
627 r
= image_path_lock(i
->path
, LOCK_EX
|LOCK_NB
, &global_lock
, &local_lock
);
633 case IMAGE_SUBVOLUME
:
635 /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the
637 if (unlink(i
->path
) < 0) {
638 r
= btrfs_subvol_remove(i
->path
, BTRFS_REMOVE_RECURSIVE
|BTRFS_REMOVE_QUOTA
);
645 case IMAGE_DIRECTORY
:
646 /* Allow deletion of read-only directories */
647 (void) chattr_path(i
->path
, 0, FS_IMMUTABLE_FL
, NULL
);
648 r
= rm_rf(i
->path
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
656 /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node
657 * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink
658 * the thing (it's most likely a symlink after all). */
660 if (path_startswith(i
->path
, "/dev"))
665 if (unlink(i
->path
) < 0)
673 STRV_FOREACH(j
, settings
) {
674 if (unlink(*j
) < 0 && errno
!= ENOENT
)
675 log_debug_errno(errno
, "Failed to unlink %s, ignoring: %m", *j
);
678 if (unlink(roothash
) < 0 && errno
!= ENOENT
)
679 log_debug_errno(errno
, "Failed to unlink %s, ignoring: %m", roothash
);
684 static int rename_auxiliary_file(const char *path
, const char *new_name
, const char *suffix
) {
685 _cleanup_free_
char *rs
= NULL
;
688 fn
= strjoina(new_name
, suffix
);
690 rs
= file_in_same_dir(path
, fn
);
694 return rename_noreplace(AT_FDCWD
, path
, AT_FDCWD
, rs
);
697 int image_rename(Image
*i
, const char *new_name
) {
698 _cleanup_(release_lock_file
) LockFile global_lock
= LOCK_FILE_INIT
, local_lock
= LOCK_FILE_INIT
, name_lock
= LOCK_FILE_INIT
;
699 _cleanup_free_
char *new_path
= NULL
, *nn
= NULL
, *roothash
= NULL
;
700 _cleanup_strv_free_
char **settings
= NULL
;
701 unsigned file_attr
= 0;
707 if (!image_name_is_valid(new_name
))
710 if (IMAGE_IS_VENDOR(i
) || IMAGE_IS_HOST(i
))
713 settings
= image_settings_path(i
);
717 roothash
= image_roothash_path(i
);
721 /* Make sure we don't interfere with a running nspawn */
722 r
= image_path_lock(i
->path
, LOCK_EX
|LOCK_NB
, &global_lock
, &local_lock
);
726 /* Make sure nobody takes the new name, between the time we
727 * checked it is currently unused in all search paths, and the
728 * time we take possession of it */
729 r
= image_name_lock(new_name
, LOCK_EX
|LOCK_NB
, &name_lock
);
733 r
= image_find(IMAGE_MACHINE
, new_name
, NULL
);
741 case IMAGE_DIRECTORY
:
742 /* Turn of the immutable bit while we rename the image, so that we can rename it */
743 (void) read_attr_path(i
->path
, &file_attr
);
745 if (file_attr
& FS_IMMUTABLE_FL
)
746 (void) chattr_path(i
->path
, 0, FS_IMMUTABLE_FL
, NULL
);
749 case IMAGE_SUBVOLUME
:
750 new_path
= file_in_same_dir(i
->path
, new_name
);
755 /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */
756 if (path_startswith(i
->path
, "/dev"))
759 new_path
= file_in_same_dir(i
->path
, new_name
);
765 fn
= strjoina(new_name
, ".raw");
766 new_path
= file_in_same_dir(i
->path
, fn
);
777 nn
= strdup(new_name
);
781 r
= rename_noreplace(AT_FDCWD
, i
->path
, AT_FDCWD
, new_path
);
785 /* Restore the immutable bit, if it was set before */
786 if (file_attr
& FS_IMMUTABLE_FL
)
787 (void) chattr_path(new_path
, FS_IMMUTABLE_FL
, FS_IMMUTABLE_FL
, NULL
);
789 free_and_replace(i
->path
, new_path
);
790 free_and_replace(i
->name
, nn
);
792 STRV_FOREACH(j
, settings
) {
793 r
= rename_auxiliary_file(*j
, new_name
, ".nspawn");
794 if (r
< 0 && r
!= -ENOENT
)
795 log_debug_errno(r
, "Failed to rename settings file %s, ignoring: %m", *j
);
798 r
= rename_auxiliary_file(roothash
, new_name
, ".roothash");
799 if (r
< 0 && r
!= -ENOENT
)
800 log_debug_errno(r
, "Failed to rename roothash file %s, ignoring: %m", roothash
);
805 static int clone_auxiliary_file(const char *path
, const char *new_name
, const char *suffix
) {
806 _cleanup_free_
char *rs
= NULL
;
809 fn
= strjoina(new_name
, suffix
);
811 rs
= file_in_same_dir(path
, fn
);
815 return copy_file_atomic(path
, rs
, 0664, 0, 0, COPY_REFLINK
);
818 int image_clone(Image
*i
, const char *new_name
, bool read_only
) {
819 _cleanup_(release_lock_file
) LockFile name_lock
= LOCK_FILE_INIT
;
820 _cleanup_strv_free_
char **settings
= NULL
;
821 _cleanup_free_
char *roothash
= NULL
;
822 const char *new_path
;
828 if (!image_name_is_valid(new_name
))
831 settings
= image_settings_path(i
);
835 roothash
= image_roothash_path(i
);
839 /* Make sure nobody takes the new name, between the time we
840 * checked it is currently unused in all search paths, and the
841 * time we take possession of it */
842 r
= image_name_lock(new_name
, LOCK_EX
|LOCK_NB
, &name_lock
);
846 r
= image_find(IMAGE_MACHINE
, new_name
, NULL
);
854 case IMAGE_SUBVOLUME
:
855 case IMAGE_DIRECTORY
:
856 /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain
859 new_path
= strjoina("/var/lib/machines/", new_name
);
861 r
= btrfs_subvol_snapshot(i
->path
, new_path
,
862 (read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
863 BTRFS_SNAPSHOT_FALLBACK_COPY
|
864 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
865 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
866 BTRFS_SNAPSHOT_RECURSIVE
|
867 BTRFS_SNAPSHOT_QUOTA
);
869 /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */
870 (void) btrfs_subvol_auto_qgroup(new_path
, 0, true);
875 new_path
= strjoina("/var/lib/machines/", new_name
, ".raw");
877 r
= copy_file_atomic(i
->path
, new_path
, read_only
? 0444 : 0644, FS_NOCOW_FL
, FS_NOCOW_FL
, COPY_REFLINK
|COPY_CRTIME
);
888 STRV_FOREACH(j
, settings
) {
889 r
= clone_auxiliary_file(*j
, new_name
, ".nspawn");
890 if (r
< 0 && r
!= -ENOENT
)
891 log_debug_errno(r
, "Failed to clone settings %s, ignoring: %m", *j
);
894 r
= clone_auxiliary_file(roothash
, new_name
, ".roothash");
895 if (r
< 0 && r
!= -ENOENT
)
896 log_debug_errno(r
, "Failed to clone root hash file %s, ignoring: %m", roothash
);
901 int image_read_only(Image
*i
, bool b
) {
902 _cleanup_(release_lock_file
) LockFile global_lock
= LOCK_FILE_INIT
, local_lock
= LOCK_FILE_INIT
;
907 if (IMAGE_IS_VENDOR(i
) || IMAGE_IS_HOST(i
))
910 /* Make sure we don't interfere with a running nspawn */
911 r
= image_path_lock(i
->path
, LOCK_EX
|LOCK_NB
, &global_lock
, &local_lock
);
917 case IMAGE_SUBVOLUME
:
919 /* Note that we set the flag only on the top-level
920 * subvolume of the image. */
922 r
= btrfs_subvol_set_read_only(i
->path
, b
);
928 case IMAGE_DIRECTORY
:
929 /* For simple directory trees we cannot use the access
930 mode of the top-level directory, since it has an
931 effect on the container itself. However, we can
932 use the "immutable" flag, to at least make the
933 top-level directory read-only. It's not as good as
934 a read-only subvolume, but at least something, and
935 we can read the value back. */
937 r
= chattr_path(i
->path
, b
? FS_IMMUTABLE_FL
: 0, FS_IMMUTABLE_FL
, NULL
);
946 if (stat(i
->path
, &st
) < 0)
949 if (chmod(i
->path
, (st
.st_mode
& 0444) | (b
? 0000 : 0200)) < 0)
952 /* If the images is now read-only, it's a good time to
953 * defrag it, given that no write patterns will
954 * fragment it again. */
956 (void) btrfs_defrag(i
->path
);
961 _cleanup_close_
int fd
= -1;
965 fd
= open(i
->path
, O_CLOEXEC
|O_RDONLY
|O_NONBLOCK
|O_NOCTTY
);
969 if (fstat(fd
, &st
) < 0)
971 if (!S_ISBLK(st
.st_mode
))
974 if (ioctl(fd
, BLKROSET
, &state
) < 0)
987 int image_path_lock(const char *path
, int operation
, LockFile
*global
, LockFile
*local
) {
988 _cleanup_free_
char *p
= NULL
;
989 LockFile t
= LOCK_FILE_INIT
;
998 /* Locks an image path. This actually creates two locks: one "local" one, next to the image path
999 * itself, which might be shared via NFS. And another "global" one, in /run, that uses the
1000 * device/inode number. This has the benefit that we can even lock a tree that is a mount point,
1003 if (!path_is_absolute(path
))
1006 switch (operation
& (LOCK_SH
|LOCK_EX
)) {
1017 if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
1018 *local
= *global
= (LockFile
) LOCK_FILE_INIT
;
1022 /* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are
1023 * running off it after all, and we don't want any images to manipulate the host image. We make an
1024 * exception for shared locks however: we allow those (and make them NOPs since there's no point in
1025 * taking them if there can't be exclusive locks). Strictly speaking these are questionable as well,
1026 * since it means changes made to the host might propagate to the container as they happen (and a
1027 * shared lock kinda suggests that no changes happen at all while it is in place), but it's too
1028 * useful not to allow read-only containers off the host root, hence let's support this, and trust
1029 * the user to do the right thing with this. */
1030 if (path_equal(path
, "/")) {
1034 *local
= *global
= (LockFile
) LOCK_FILE_INIT
;
1038 if (stat(path
, &st
) >= 0) {
1039 if (S_ISBLK(st
.st_mode
))
1040 r
= asprintf(&p
, "/run/systemd/nspawn/locks/block-%u:%u", major(st
.st_rdev
), minor(st
.st_rdev
));
1041 else if (S_ISDIR(st
.st_mode
) || S_ISREG(st
.st_mode
))
1042 r
= asprintf(&p
, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st
.st_dev
, (unsigned long) st
.st_ino
);
1050 /* For block devices we don't need the "local" lock, as the major/minor lock above should be
1051 * sufficient, since block devices are host local anyway. */
1052 if (!path_startswith(path
, "/dev/")) {
1053 r
= make_lock_file_for(path
, operation
, &t
);
1055 if (!exclusive
&& r
== -EROFS
)
1056 log_debug_errno(r
, "Failed to create shared lock for '%s', ignoring: %m", path
);
1063 (void) mkdir_p("/run/systemd/nspawn/locks", 0700);
1065 r
= make_lock_file(p
, operation
, global
);
1067 release_lock_file(&t
);
1071 *global
= (LockFile
) LOCK_FILE_INIT
;
1077 int image_set_limit(Image
*i
, uint64_t referenced_max
) {
1080 if (IMAGE_IS_VENDOR(i
) || IMAGE_IS_HOST(i
))
1083 if (i
->type
!= IMAGE_SUBVOLUME
)
1086 /* We set the quota both for the subvolume as well as for the
1087 * subtree. The latter is mostly for historical reasons, since
1088 * we didn't use to have a concept of subtree quota, and hence
1089 * only modified the subvolume quota. */
1091 (void) btrfs_qgroup_set_limit(i
->path
, 0, referenced_max
);
1092 (void) btrfs_subvol_auto_qgroup(i
->path
, 0, true);
1093 return btrfs_subvol_set_subtree_quota_limit(i
->path
, 0, referenced_max
);
1096 int image_read_metadata(Image
*i
) {
1097 _cleanup_(release_lock_file
) LockFile global_lock
= LOCK_FILE_INIT
, local_lock
= LOCK_FILE_INIT
;
1102 r
= image_path_lock(i
->path
, LOCK_SH
|LOCK_NB
, &global_lock
, &local_lock
);
1108 case IMAGE_SUBVOLUME
:
1109 case IMAGE_DIRECTORY
: {
1110 _cleanup_strv_free_
char **machine_info
= NULL
, **os_release
= NULL
;
1111 sd_id128_t machine_id
= SD_ID128_NULL
;
1112 _cleanup_free_
char *hostname
= NULL
;
1113 _cleanup_free_
char *path
= NULL
;
1115 r
= chase_symlinks("/etc/hostname", i
->path
, CHASE_PREFIX_ROOT
|CHASE_TRAIL_SLASH
, &path
, NULL
);
1116 if (r
< 0 && r
!= -ENOENT
)
1117 log_debug_errno(r
, "Failed to chase /etc/hostname in image %s: %m", i
->name
);
1119 r
= read_etc_hostname(path
, &hostname
);
1121 log_debug_errno(errno
, "Failed to read /etc/hostname of image %s: %m", i
->name
);
1126 r
= chase_symlinks("/etc/machine-id", i
->path
, CHASE_PREFIX_ROOT
|CHASE_TRAIL_SLASH
, &path
, NULL
);
1127 if (r
< 0 && r
!= -ENOENT
)
1128 log_debug_errno(r
, "Failed to chase /etc/machine-id in image %s: %m", i
->name
);
1130 _cleanup_close_
int fd
= -1;
1132 fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
);
1134 log_debug_errno(errno
, "Failed to open %s: %m", path
);
1136 r
= id128_read_fd(fd
, ID128_PLAIN
, &machine_id
);
1138 log_debug_errno(r
, "Image %s contains invalid machine ID.", i
->name
);
1144 r
= chase_symlinks("/etc/machine-info", i
->path
, CHASE_PREFIX_ROOT
|CHASE_TRAIL_SLASH
, &path
, NULL
);
1145 if (r
< 0 && r
!= -ENOENT
)
1146 log_debug_errno(r
, "Failed to chase /etc/machine-info in image %s: %m", i
->name
);
1148 r
= load_env_file_pairs(NULL
, path
, &machine_info
);
1150 log_debug_errno(r
, "Failed to parse machine-info data of %s: %m", i
->name
);
1153 r
= load_os_release_pairs(i
->path
, &os_release
);
1155 log_debug_errno(r
, "Failed to read os-release in image, ignoring: %m");
1157 free_and_replace(i
->hostname
, hostname
);
1158 i
->machine_id
= machine_id
;
1159 strv_free_and_replace(i
->machine_info
, machine_info
);
1160 strv_free_and_replace(i
->os_release
, os_release
);
1167 _cleanup_(loop_device_unrefp
) LoopDevice
*d
= NULL
;
1168 _cleanup_(dissected_image_unrefp
) DissectedImage
*m
= NULL
;
1170 r
= loop_device_make_by_path(i
->path
, O_RDONLY
, LO_FLAGS_PARTSCAN
, &d
);
1174 r
= dissect_image(d
->fd
, NULL
, NULL
, DISSECT_IMAGE_REQUIRE_ROOT
|DISSECT_IMAGE_RELAX_VAR_CHECK
, &m
);
1178 r
= dissected_image_acquire_metadata(m
);
1182 free_and_replace(i
->hostname
, m
->hostname
);
1183 i
->machine_id
= m
->machine_id
;
1184 strv_free_and_replace(i
->machine_info
, m
->machine_info
);
1185 strv_free_and_replace(i
->os_release
, m
->os_release
);
1194 i
->metadata_valid
= true;
1199 int image_name_lock(const char *name
, int operation
, LockFile
*ret
) {
1203 /* Locks an image name, regardless of the precise path used. */
1205 if (!image_name_is_valid(name
))
1208 if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
1209 *ret
= (LockFile
) LOCK_FILE_INIT
;
1213 if (streq(name
, ".host"))
1216 const char *p
= strjoina("/run/systemd/nspawn/locks/name-", name
);
1217 (void) mkdir_p("/run/systemd/nspawn/locks", 0700);
1218 return make_lock_file(p
, operation
, ret
);
1221 bool image_name_is_valid(const char *s
) {
1222 if (!filename_is_valid(s
))
1225 if (string_has_cc(s
, NULL
))
1228 if (!utf8_is_valid(s
))
1231 /* Temporary files for atomically creating new files */
1232 if (startswith(s
, ".#"))
1238 bool image_in_search_path(ImageClass
class, const char *image
) {
1243 NULSTR_FOREACH(path
, image_search_path
[class]) {
1247 p
= path_startswith(image
, path
);
1251 /* Make sure there's a filename following */
1252 k
= strcspn(p
, "/");
1258 /* Accept trailing slashes */
1259 if (p
[strspn(p
, "/")] == 0)
1267 static const char* const image_type_table
[_IMAGE_TYPE_MAX
] = {
1268 [IMAGE_DIRECTORY
] = "directory",
1269 [IMAGE_SUBVOLUME
] = "subvolume",
1270 [IMAGE_RAW
] = "raw",
1271 [IMAGE_BLOCK
] = "block",
1274 DEFINE_STRING_TABLE_LOOKUP(image_type
, ImageType
);