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systemd/src/shared/discover-image.c
Lennart Poettering e1b3319b6c discover-image: support runtime scope also for .nspawn settings files and the pool dir 
discover-image.[ch] largely already supports per-scope operations, let's
extend this however to also cover finding .nspawn settings files and
managing the pool dir.
2025-09-25 22:43:59 +02:00

1984 lines
72 KiB
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/loop.h>
#include <linux/magic.h>
#include <stdio.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <unistd.h>
#include "sd-json.h"
#include "sd-path.h"
#include "alloc-util.h"
#include "blockdev-util.h"
#include "btrfs-util.h"
#include "chase.h"
#include "chattr-util.h"
#include "copy.h"
#include "dirent-util.h"
#include "discover-image.h"
#include "dissect-image.h"
#include "env-file.h"
#include "env-util.h"
#include "extension-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "hostname-setup.h"
#include "id128-util.h"
#include "initrd-util.h"
#include "lock-util.h"
#include "log.h"
#include "loop-util.h"
#include "mkdir.h"
#include "nulstr-util.h"
#include "os-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "runtime-scope.h"
#include "stat-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "time-util.h"
#include "vpick.h"
#include "xattr-util.h"
const char* const image_search_path[_IMAGE_CLASS_MAX] = {
[IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */
"/run/machines\0" /* and here too */
"/var/lib/machines\0" /* the main place for images */
"/var/lib/container\0" /* legacy */
"/usr/local/lib/machines\0"
"/usr/lib/machines\0",
[IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */
"/run/portables\0" /* and here too */
"/var/lib/portables\0" /* the main place for images */
"/usr/local/lib/portables\0"
"/usr/lib/portables\0",
/* Note that we don't allow storing extensions under /usr/, unlike with other image types. That's
* because extension images are supposed to extend /usr/, so you get into recursive races, especially
* with directory-based extensions, as the kernel's OverlayFS explicitly checks for this and errors
* out with -ELOOP if it finds that a lowerdir= is a child of another lowerdir=. */
[IMAGE_SYSEXT] = "/etc/extensions\0" /* only place symlinks here */
"/run/extensions\0" /* and here too */
"/var/lib/extensions\0", /* the main place for images */
[IMAGE_CONFEXT] = "/run/confexts\0" /* only place symlinks here */
"/var/lib/confexts\0" /* the main place for images */
"/usr/local/lib/confexts\0"
"/usr/lib/confexts\0",
};
/* Inside the initrd, use a slightly different set of search path (i.e. include .extra/sysext/,
* /.extra/global_sysext, .extra/confext/, and /.extra/global_confext in extension search dir) */
static const char* const image_search_path_initrd[_IMAGE_CLASS_MAX] = {
/* (entries that aren't listed here will get the same search path as for the non initrd-case) */
[IMAGE_SYSEXT] = "/etc/extensions\0" /* only place symlinks here */
"/run/extensions\0" /* and here too */
"/var/lib/extensions\0" /* the main place for images */
"/.extra/sysext\0" /* put sysext (per-UKI and global) picked up by systemd-stub */
"/.extra/global_sysext\0", /* last, since not trusted */
[IMAGE_CONFEXT] = "/run/confexts\0" /* only place symlinks here */
"/var/lib/confexts\0" /* the main place for images */
"/usr/local/lib/confexts\0"
"/.extra/confext\0" /* put confext (per-UKI and global) picked up by systemd-stub */
"/.extra/global_confext\0", /* last, since not trusted. */
};
static const char* image_class_suffix_table[_IMAGE_CLASS_MAX] = {
[IMAGE_SYSEXT] = ".sysext",
[IMAGE_CONFEXT] = ".confext",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(image_class_suffix, ImageClass);
static const char *const image_root_table[_IMAGE_CLASS_MAX] = {
[IMAGE_MACHINE] = "/var/lib/machines",
[IMAGE_PORTABLE] = "/var/lib/portables",
[IMAGE_SYSEXT] = "/var/lib/extensions",
[IMAGE_CONFEXT] = "/var/lib/confexts",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(image_root, ImageClass);
static const char *const image_root_runtime_table[_IMAGE_CLASS_MAX] = {
[IMAGE_MACHINE] = "/run/machines",
[IMAGE_PORTABLE] = "/run/portables",
[IMAGE_SYSEXT] = "/run/extensions",
[IMAGE_CONFEXT] = "/run/confexts",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(image_root_runtime, ImageClass);
static const char *const image_dirname_table[_IMAGE_CLASS_MAX] = {
[IMAGE_MACHINE] = "machines",
[IMAGE_PORTABLE] = "portables",
[IMAGE_SYSEXT] = "extensions",
[IMAGE_CONFEXT] = "confexts",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(image_dirname, ImageClass);
static Image* image_free(Image *i) {
assert(i);
free(i->name);
free(i->path);
free(i->hostname);
strv_free(i->machine_info);
strv_free(i->os_release);
strv_free(i->sysext_release);
strv_free(i->confext_release);
return mfree(i);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free);
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func,
Image, image_unref);
static char** image_settings_path(Image *image, RuntimeScope scope) {
_cleanup_strv_free_ char **l = NULL;
_cleanup_free_ char *fn = NULL;
size_t i = 0;
int r;
assert(image);
l = new0(char*, 5);
if (!l)
return NULL;
fn = strjoin(image->name, ".nspawn");
if (!fn)
return NULL;
static const uint64_t system_locations[] = {
SD_PATH_SYSTEM_CONFIGURATION,
SD_PATH_SYSTEM_RUNTIME,
SD_PATH_SYSTEM_LIBRARY_PRIVATE,
UINT64_MAX
};
static const uint64_t user_locations[] = {
SD_PATH_USER_CONFIGURATION,
SD_PATH_USER_RUNTIME,
SD_PATH_USER_LIBRARY_PRIVATE,
UINT64_MAX
};
const uint64_t *locations;
switch (scope) {
case RUNTIME_SCOPE_SYSTEM:
locations = system_locations;
break;
case RUNTIME_SCOPE_USER:
locations = user_locations;
break;
default:
assert_not_reached();
}
for (size_t k = 0; locations[k] != UINT64_MAX; k++) {
_cleanup_free_ char *s = NULL;
r = sd_path_lookup(locations[k], "systemd/nspawn", &s);
if (r == -ENXIO)
continue;
if (r < 0)
return NULL;
l[i] = path_join(s, fn);
if (!l[i])
return NULL;
i++;
}
r = file_in_same_dir(image->path, fn, l + i);
if (r == -ENOMEM)
return NULL;
if (r < 0)
log_debug_errno(r, "Failed to generate .nspawn settings path from image path, ignoring: %m");
strv_uniq(l);
return TAKE_PTR(l);
}
static int image_roothash_path(Image *image, char **ret) {
_cleanup_free_ char *fn = NULL;
assert(image);
fn = strjoin(image->name, ".roothash");
if (!fn)
return -ENOMEM;
return file_in_same_dir(image->path, fn, ret);
}
static int image_new(
ImageType t,
ImageClass c,
const char *pretty,
const char *path,
const char *filename,
bool read_only,
usec_t crtime,
usec_t mtime,
Image **ret) {
_cleanup_(image_unrefp) Image *i = NULL;
assert(t >= 0);
assert(t < _IMAGE_TYPE_MAX);
assert(pretty);
assert(filename);
assert(ret);
i = new(Image, 1);
if (!i)
return -ENOMEM;
*i = (Image) {
.n_ref = 1,
.type = t,
.class = c,
.read_only = read_only,
.crtime = crtime,
.mtime = mtime,
.usage = UINT64_MAX,
.usage_exclusive = UINT64_MAX,
.limit = UINT64_MAX,
.limit_exclusive = UINT64_MAX,
};
i->name = strdup(pretty);
if (!i->name)
return -ENOMEM;
i->path = path_join(path, filename);
if (!i->path)
return -ENOMEM;
path_simplify(i->path);
*ret = TAKE_PTR(i);
return 0;
}
static int extract_image_basename(
const char *path,
const char *class_suffix, /* e.g. ".sysext" (this is an optional suffix) */
char **format_suffixes, /* e.g. ".raw" (one of these will be required) */
char **ret_basename,
char **ret_suffix) {
_cleanup_free_ char *name = NULL, *suffix = NULL;
int r;
assert(path);
r = path_extract_filename(path, &name);
if (r < 0)
return r;
if (format_suffixes) {
char *e = endswith_strv(name, format_suffixes);
if (!e) /* Format suffix is required */
return -EINVAL;
if (ret_suffix) {
suffix = strdup(e);
if (!suffix)
return -ENOMEM;
}
*e = 0;
}
if (class_suffix) {
char *e = endswith(name, class_suffix);
if (e) { /* Class suffix is optional */
if (ret_suffix) {
_cleanup_free_ char *j = strjoin(e, suffix);
if (!j)
return -ENOMEM;
free_and_replace(suffix, j);
}
*e = 0;
}
}
if (!image_name_is_valid(name))
return -EINVAL;
if (ret_suffix)
*ret_suffix = TAKE_PTR(suffix);
if (ret_basename)
*ret_basename = TAKE_PTR(name);
return 0;
}
static int image_update_quota(Image *i, int fd) {
_cleanup_close_ int fd_close = -EBADF;
int r;
assert(i);
if (image_is_vendor(i) || image_is_host(i))
return -EROFS;
if (i->type != IMAGE_SUBVOLUME)
return -EOPNOTSUPP;
if (fd < 0) {
fd_close = open(i->path, O_CLOEXEC|O_DIRECTORY);
if (fd_close < 0)
return -errno;
fd = fd_close;
} else {
/* Convert from O_PATH to proper fd, if needed */
fd = fd_reopen_condition(fd, O_CLOEXEC|O_DIRECTORY, O_PATH, &fd_close);
if (fd < 0)
return fd;
}
r = btrfs_quota_scan_ongoing(fd);
if (r < 0)
return r;
if (r > 0)
return 0;
BtrfsQuotaInfo quota;
r = btrfs_subvol_get_subtree_quota_fd(fd, 0, &quota);
if (r < 0)
return r;
i->usage = quota.referenced;
i->usage_exclusive = quota.exclusive;
i->limit = quota.referenced_max;
i->limit_exclusive = quota.exclusive_max;
return 1;
}
static int image_make(
ImageClass c,
const char *pretty,
int dir_fd,
const char *dir_path,
const char *filename,
int fd, /* O_PATH fd */
const struct stat *st,
Image **ret) {
_cleanup_free_ char *pretty_buffer = NULL;
bool read_only;
int r;
assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
assert(dir_path || dir_fd == AT_FDCWD);
assert(filename);
/* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block
* devices into /var/lib/machines/, and treat them normally.
*
* This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we
* recognize. */
_cleanup_close_ int _fd = -EBADF;
if (fd < 0) {
/* If we didn't get an fd passed in, then let's pin it via O_PATH now */
_fd = openat(dir_fd, filename, O_PATH|O_CLOEXEC);
if (_fd < 0)
return -errno;
fd = _fd;
st = NULL; /* refresh stat() data now that we have the inode pinned */
}
struct stat stbuf;
if (!st) {
if (fstat(fd, &stbuf) < 0)
return -errno;
st = &stbuf;
}
_cleanup_free_ char *parent = NULL;
if (!dir_path) {
(void) fd_get_path(dir_fd, &parent);
dir_path = parent;
}
read_only =
(dir_path && path_startswith(dir_path, "/usr")) ||
(faccessat(fd, "", W_OK, AT_EACCESS|AT_EMPTY_PATH) < 0 && errno == EROFS);
if (S_ISDIR(st->st_mode)) {
unsigned file_attr = 0;
usec_t crtime = 0;
if (!ret)
return 0;
if (!pretty) {
r = extract_image_basename(
filename,
image_class_suffix_to_string(c),
/* format_suffixes= */ NULL,
&pretty_buffer,
/* ret_suffix= */ NULL);
if (r < 0)
return r;
pretty = pretty_buffer;
}
if (btrfs_might_be_subvol(st)) {
r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
if (r < 0)
return r;
if (r > 0) {
BtrfsSubvolInfo info;
/* It's a btrfs subvolume */
r = btrfs_subvol_get_info_fd(fd, 0, &info);
if (r < 0)
return r;
r = image_new(IMAGE_SUBVOLUME,
c,
pretty,
dir_path,
filename,
info.read_only || read_only,
info.otime,
info.ctime,
ret);
if (r < 0)
return r;
(void) image_update_quota(*ret, fd);
return 0;
}
}
/* Get directory creation time (not available everywhere, but that's OK */
(void) fd_getcrtime(fd, &crtime);
/* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not
* supported everywhere we ignore failures. */
(void) read_attr_fd(fd, &file_attr);
/* It's just a normal directory. */
r = image_new(IMAGE_DIRECTORY,
c,
pretty,
dir_path,
filename,
read_only || (file_attr & FS_IMMUTABLE_FL),
crtime,
0, /* we don't use mtime of stat() here, since it's not the time of last change of the tree, but only of the top-level dir */
ret);
if (r < 0)
return r;
return 0;
} else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) {
usec_t crtime = 0;
/* It's a RAW disk image */
if (!ret)
return 0;
(void) fd_getcrtime(fd, &crtime);
if (!pretty) {
r = extract_image_basename(
filename,
image_class_suffix_to_string(c),
STRV_MAKE(".raw"),
&pretty_buffer,
/* ret_suffix= */ NULL);
if (r < 0)
return r;
pretty = pretty_buffer;
}
r = image_new(IMAGE_RAW,
c,
pretty,
dir_path,
filename,
!(st->st_mode & 0222) || read_only,
crtime,
timespec_load(&st->st_mtim),
ret);
if (r < 0)
return r;
(*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512;
(*ret)->limit = (*ret)->limit_exclusive = st->st_size;
return 0;
} else if (S_ISBLK(st->st_mode)) {
uint64_t size = UINT64_MAX;
/* A block device */
if (!ret)
return 0;
if (!pretty) {
r = extract_image_basename(
filename,
/* class_suffix= */ NULL,
/* format_suffix= */ NULL,
&pretty_buffer,
/* ret_suffix= */ NULL);
if (r < 0)
return r;
pretty = pretty_buffer;
}
_cleanup_close_ int block_fd = fd_reopen(fd, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
if (block_fd < 0)
log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", strnull(dir_path), filename);
else {
if (!read_only) {
int state = 0;
if (ioctl(block_fd, BLKROGET, &state) < 0)
log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", strnull(dir_path), filename);
else if (state)
read_only = true;
}
r = blockdev_get_device_size(block_fd, &size);
if (r < 0)
log_debug_errno(r, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", strnull(dir_path), filename);
block_fd = safe_close(block_fd);
}
r = image_new(IMAGE_BLOCK,
c,
pretty,
dir_path,
filename,
!(st->st_mode & 0222) || read_only,
0,
0,
ret);
if (r < 0)
return r;
if (!IN_SET(size, 0, UINT64_MAX))
(*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size;
return 0;
}
return -EMEDIUMTYPE;
}
static int pick_image_search_path(
RuntimeScope scope,
ImageClass class,
char ***ret) {
int r;
assert(scope < _RUNTIME_SCOPE_MAX && scope != RUNTIME_SCOPE_GLOBAL);
assert(class < _IMAGE_CLASS_MAX);
assert(ret);
if (class < 0) {
*ret = NULL;
return 0;
}
if (scope < 0) {
_cleanup_strv_free_ char **a = NULL, **b = NULL;
r = pick_image_search_path(RUNTIME_SCOPE_USER, class, &a);
if (r < 0)
return r;
r = pick_image_search_path(RUNTIME_SCOPE_SYSTEM, class, &b);
if (r < 0)
return r;
r = strv_extend_strv(&a, b, /* filter_duplicates= */ false);
if (r < 0)
return r;
*ret = TAKE_PTR(a);
return 0;
}
switch (scope) {
case RUNTIME_SCOPE_SYSTEM: {
const char *ns;
/* Use the initrd search path if there is one, otherwise use the common one */
ns = in_initrd() && image_search_path_initrd[class] ?
image_search_path_initrd[class] :
image_search_path[class];
if (!ns)
break;
_cleanup_strv_free_ char **search = strv_split_nulstr(ns);
if (!search)
return -ENOMEM;
*ret = TAKE_PTR(search);
return 0;
}
case RUNTIME_SCOPE_USER: {
if (class != IMAGE_MACHINE)
break;
static const uint64_t dirs[] = {
SD_PATH_USER_RUNTIME,
SD_PATH_USER_STATE_PRIVATE,
SD_PATH_USER_LIBRARY_PRIVATE,
};
_cleanup_strv_free_ char **search = NULL;
FOREACH_ELEMENT(d, dirs) {
_cleanup_free_ char *p = NULL;
r = sd_path_lookup(*d, "machines", &p);
if (r == -ENXIO) /* No XDG_RUNTIME_DIR set */
continue;
if (r < 0)
return r;
r = strv_consume(&search, TAKE_PTR(p));
if (r < 0)
return r;
}
*ret = TAKE_PTR(search);
return 0;
}
default:
assert_not_reached();
}
*ret = NULL;
return 0;
}
static char** make_possible_filenames(ImageClass class, const char *image_name) {
_cleanup_strv_free_ char **l = NULL;
assert(image_name);
FOREACH_STRING(v_suffix, "", ".v")
FOREACH_STRING(format_suffix, "", ".raw") {
_cleanup_free_ char *j = NULL;
const char *class_suffix;
class_suffix = image_class_suffix_to_string(class);
if (class_suffix) {
j = strjoin(image_name, class_suffix, format_suffix, v_suffix);
if (!j)
return NULL;
if (strv_consume(&l, TAKE_PTR(j)) < 0)
return NULL;
}
j = strjoin(image_name, format_suffix, v_suffix);
if (!j)
return NULL;
if (strv_consume(&l, TAKE_PTR(j)) < 0)
return NULL;
}
return TAKE_PTR(l);
}
int image_find(RuntimeScope scope,
ImageClass class,
const char *name,
const char *root,
Image **ret) {
/* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to
* symlink block devices into the search path. (For now, we disable that when operating relative to
* some root directory.) */
int open_flags = root ? O_NOFOLLOW : 0, r;
assert(scope < _RUNTIME_SCOPE_MAX && scope != RUNTIME_SCOPE_GLOBAL);
assert(class >= 0);
assert(class < _IMAGE_CLASS_MAX);
assert(name);
/* There are no images with invalid names */
if (!image_name_is_valid(name))
return -ENOENT;
_cleanup_strv_free_ char **names = make_possible_filenames(class, name);
if (!names)
return -ENOMEM;
_cleanup_strv_free_ char **search = NULL;
r = pick_image_search_path(scope, class, &search);
if (r < 0)
return r;
STRV_FOREACH(path, search) {
_cleanup_free_ char *resolved = NULL;
_cleanup_closedir_ DIR *d = NULL;
r = chase_and_opendir(*path, root, CHASE_PREFIX_ROOT, &resolved, &d);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
STRV_FOREACH(n, names) {
_cleanup_free_ char *fname_buf = NULL;
const char *fname = *n;
_cleanup_close_ int fd = openat(dirfd(d), fname, O_PATH|O_CLOEXEC|open_flags);
if (fd < 0) {
if (errno != ENOENT)
return -errno;
continue;
}
struct stat st;
if (fstat(fd, &st) < 0)
return -errno;
if (endswith(fname, ".raw")) {
if (!S_ISREG(st.st_mode)) {
log_debug("Ignoring non-regular file '%s' with .raw suffix.", fname);
continue;
}
} else if (endswith(fname, ".v")) {
if (!S_ISDIR(st.st_mode)) {
log_debug("Ignoring non-directory file '%s' with .v suffix.", fname);
continue;
}
_cleanup_free_ char *suffix = NULL;
suffix = strdup(ASSERT_PTR(startswith(fname, name)));
if (!suffix)
return -ENOMEM;
*ASSERT_PTR(endswith(suffix, ".v")) = 0;
_cleanup_free_ char *vp = path_join(resolved, fname);
if (!vp)
return -ENOMEM;
PickFilter filter = {
.type_mask = endswith(suffix, ".raw") ? (UINT32_C(1) << DT_REG) | (UINT32_C(1) << DT_BLK) : (UINT32_C(1) << DT_DIR),
.basename = name,
.architecture = _ARCHITECTURE_INVALID,
.suffix = STRV_MAKE(suffix),
};
_cleanup_(pick_result_done) PickResult result = PICK_RESULT_NULL;
r = path_pick(root,
/* toplevel_fd= */ AT_FDCWD,
vp,
&filter,
PICK_ARCHITECTURE|PICK_TRIES,
&result);
if (r < 0) {
log_debug_errno(r, "Failed to pick versioned image on '%s', skipping: %m", vp);
continue;
}
if (!result.path) {
log_debug("Found versioned directory '%s', without matching entry, skipping: %m", vp);
continue;
}
/* Refresh the stat data for the discovered target */
st = result.st;
fd = safe_close(fd);
_cleanup_free_ char *bn = NULL;
r = path_extract_filename(result.path, &bn);
if (r < 0) {
log_debug_errno(r, "Failed to extract basename of image path '%s', skipping: %m", result.path);
continue;
}
fname_buf = path_join(fname, bn);
if (!fname_buf)
return log_oom();
fname = fname_buf;
} else if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) {
log_debug("Ignoring non-directory and non-block device file '%s' without suffix.", fname);
continue;
}
r = image_make(class, name, dirfd(d), resolved, fname, fd, &st, ret);
if (IN_SET(r, -ENOENT, -EMEDIUMTYPE))
continue;
if (r < 0)
return r;
if (ret)
(*ret)->discoverable = true;
return 1;
}
}
if (scope == RUNTIME_SCOPE_SYSTEM && class == IMAGE_MACHINE && streq(name, ".host")) {
r = image_make(class,
".host",
/* dir_fd= */ AT_FDCWD,
/* dir_path= */ NULL,
/* filename= */ empty_to_root(root),
/* fd= */ -EBADF,
/* st= */ NULL,
ret);
if (r < 0)
return r;
if (ret)
(*ret)->discoverable = true;
return 1;
}
return -ENOENT;
};
int image_from_path(const char *path, Image **ret) {
/* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether
* the image is in the image search path. And if it is we don't know if the path we used is actually not
* overridden by another, different image earlier in the search path */
if (path_equal(path, "/"))
return image_make(
IMAGE_MACHINE,
".host",
/* dir_fd= */ AT_FDCWD,
/* dir_path= */ NULL,
/* filename= */ "/",
/* fd= */ -EBADF,
/* st= */ NULL,
ret);
return image_make(
_IMAGE_CLASS_INVALID,
/* pretty= */ NULL,
/* dir_fd= */ AT_FDCWD,
/* dir_path= */ NULL,
/* filename= */ path,
/* fd= */ -EBADF,
/* st= */ NULL,
ret);
}
int image_find_harder(
RuntimeScope scope,
ImageClass class,
const char *name_or_path,
const char *root,
Image **ret) {
if (image_name_is_valid(name_or_path))
return image_find(scope, class, name_or_path, root, ret);
return image_from_path(name_or_path, ret);
}
int image_discover(
RuntimeScope scope,
ImageClass class,
const char *root,
Hashmap **images) {
/* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to
* symlink block devices into the search path. (For now, we disable that when operating relative to
* some root directory.) */
int open_flags = root ? O_NOFOLLOW : 0, r;
assert(scope < _RUNTIME_SCOPE_MAX && scope != RUNTIME_SCOPE_GLOBAL);
assert(class >= 0);
assert(class < _IMAGE_CLASS_MAX);
assert(images);
_cleanup_strv_free_ char **search = NULL;
r = pick_image_search_path(scope, class, &search);
if (r < 0)
return r;
STRV_FOREACH(path, search) {
_cleanup_free_ char *resolved = NULL;
_cleanup_closedir_ DIR *d = NULL;
r = chase_and_opendir(*path, root, CHASE_PREFIX_ROOT, &resolved, &d);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
FOREACH_DIRENT_ALL(de, d, return -errno) {
_cleanup_free_ char *pretty = NULL, *fname_buf = NULL;
_cleanup_(image_unrefp) Image *image = NULL;
const char *fname = de->d_name;
if (dot_or_dot_dot(fname))
continue;
_cleanup_close_ int fd = openat(dirfd(d), fname, O_PATH|O_CLOEXEC|open_flags);
if (fd < 0) {
if (errno != ENOENT)
return -errno;
continue; /* Vanished while we were looking at it */
}
struct stat st;
if (fstat(fd, &st) < 0)
return -errno;
if (S_ISREG(st.st_mode)) {
r = extract_image_basename(
fname,
image_class_suffix_to_string(class),
STRV_MAKE(".raw"),
&pretty,
/* ret_suffix= */ NULL);
if (r < 0) {
log_debug_errno(r, "Skipping directory entry '%s', which doesn't look like an image.", fname);
continue;
}
} else if (S_ISDIR(st.st_mode)) {
const char *v;
v = endswith(fname, ".v");
if (v) {
_cleanup_free_ char *suffix = NULL, *nov = NULL;
nov = strndup(fname, v - fname); /* Chop off the .v */
if (!nov)
return -ENOMEM;
r = extract_image_basename(
nov,
image_class_suffix_to_string(class),
STRV_MAKE(".raw", ""),
&pretty,
&suffix);
if (r < 0) {
log_debug_errno(r, "Skipping directory entry '%s', which doesn't look like a versioned image.", fname);
continue;
}
_cleanup_free_ char *vp = path_join(resolved, fname);
if (!vp)
return -ENOMEM;
PickFilter filter = {
.type_mask = endswith(suffix, ".raw") ? (UINT32_C(1) << DT_REG) | (UINT32_C(1) << DT_BLK) : (UINT32_C(1) << DT_DIR),
.basename = pretty,
.architecture = _ARCHITECTURE_INVALID,
.suffix = STRV_MAKE(suffix),
};
_cleanup_(pick_result_done) PickResult result = PICK_RESULT_NULL;
r = path_pick(root,
/* toplevel_fd= */ AT_FDCWD,
vp,
&filter,
PICK_ARCHITECTURE|PICK_TRIES,
&result);
if (r < 0) {
log_debug_errno(r, "Failed to pick versioned image on '%s', skipping: %m", vp);
continue;
}
if (!result.path) {
log_debug("Found versioned directory '%s', without matching entry, skipping: %m", vp);
continue;
}
/* Refresh the stat data for the discovered target */
st = result.st;
fd = safe_close(fd);
_cleanup_free_ char *bn = NULL;
r = path_extract_filename(result.path, &bn);
if (r < 0) {
log_debug_errno(r, "Failed to extract basename of image path '%s', skipping: %m", result.path);
continue;
}
fname_buf = path_join(fname, bn);
if (!fname_buf)
return log_oom();
fname = fname_buf;
} else {
r = extract_image_basename(
fname,
image_class_suffix_to_string(class),
/* format_suffixes= */ NULL,
&pretty,
/* ret_suffix= */ NULL);
if (r < 0) {
log_debug_errno(r, "Skipping directory entry '%s', which doesn't look like an image.", fname);
continue;
}
}
} else if (S_ISBLK(st.st_mode)) {
r = extract_image_basename(
fname,
/* class_suffix= */ NULL,
/* format_suffix= */ NULL,
&pretty,
/* ret_suffix= */ NULL);
if (r < 0) {
log_debug_errno(r, "Skipping directory entry '%s', which doesn't look like an image.", fname);
continue;
}
} else {
log_debug("Skipping directory entry '%s', which is neither regular file, directory nor block device.", fname);
continue;
}
if (hashmap_contains(*images, pretty))
continue;
r = image_make(class, pretty, dirfd(d), resolved, fname, fd, &st, &image);
if (IN_SET(r, -ENOENT, -EMEDIUMTYPE))
continue;
if (r < 0)
return r;
image->discoverable = true;
r = hashmap_ensure_put(images, &image_hash_ops, image->name, image);
if (r < 0)
return r;
TAKE_PTR(image);
}
}
if (scope == RUNTIME_SCOPE_SYSTEM && class == IMAGE_MACHINE && !hashmap_contains(*images, ".host")) {
_cleanup_(image_unrefp) Image *image = NULL;
r = image_make(IMAGE_MACHINE,
".host",
/* dir_fd= */ AT_FDCWD,
/* dir_path= */ NULL,
empty_to_root(root),
/* fd= */ -EBADF,
/* st= */ NULL,
&image);
if (r < 0)
return r;
image->discoverable = true;
r = hashmap_ensure_put(images, &image_hash_ops, image->name, image);
if (r < 0)
return r;
image = NULL;
}
return 0;
}
int image_remove(Image *i, RuntimeScope scope) {
_cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT;
_cleanup_strv_free_ char **settings = NULL;
_cleanup_free_ char *roothash = NULL;
int r;
assert(i);
if (image_is_vendor(i) || image_is_host(i))
return -EROFS;
settings = image_settings_path(i, scope);
if (!settings)
return -ENOMEM;
r = image_roothash_path(i, &roothash);
if (r < 0)
return r;
/* Make sure we don't interfere with a running nspawn */
r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock);
if (r < 0)
return r;
switch (i->type) {
case IMAGE_SUBVOLUME:
/* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the
* big guns */
if (unlink(i->path) < 0) {
r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
if (r < 0)
return r;
}
break;
case IMAGE_DIRECTORY:
/* Allow deletion of read-only directories */
(void) chattr_path(i->path, 0, FS_IMMUTABLE_FL);
r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
if (r < 0)
return r;
break;
case IMAGE_BLOCK:
/* If this is inside of /dev, then it's a real block device, hence let's not touch the device node
* itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink
* the thing (it's most likely a symlink after all). */
if (path_startswith(i->path, "/dev"))
break;
_fallthrough_;
case IMAGE_RAW:
if (unlink(i->path) < 0)
return -errno;
break;
default:
return -EOPNOTSUPP;
}
STRV_FOREACH(j, settings)
if (unlink(*j) < 0 && errno != ENOENT)
log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j);
if (unlink(roothash) < 0 && errno != ENOENT)
log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash);
return 0;
}
static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) {
_cleanup_free_ char *fn = NULL, *rs = NULL;
int r;
fn = strjoin(new_name, suffix);
if (!fn)
return -ENOMEM;
r = file_in_same_dir(path, fn, &rs);
if (r < 0)
return r;
return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs);
}
int image_rename(Image *i, const char *new_name, RuntimeScope scope) {
_cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT;
_cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL;
_cleanup_strv_free_ char **settings = NULL;
unsigned file_attr = 0;
int r;
assert(i);
if (!image_name_is_valid(new_name))
return -EINVAL;
if (image_is_vendor(i) || image_is_host(i))
return -EROFS;
settings = image_settings_path(i, scope);
if (!settings)
return -ENOMEM;
r = image_roothash_path(i, &roothash);
if (r < 0)
return r;
/* Make sure we don't interfere with a running nspawn */
r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock);
if (r < 0)
return r;
/* Make sure nobody takes the new name, between the time we
* checked it is currently unused in all search paths, and the
* time we take possession of it */
r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock);
if (r < 0)
return r;
r = image_find(scope, IMAGE_MACHINE, new_name, NULL, NULL);
if (r >= 0)
return -EEXIST;
if (r != -ENOENT)
return r;
switch (i->type) {
case IMAGE_DIRECTORY:
/* Turn of the immutable bit while we rename the image, so that we can rename it */
(void) read_attr_at(AT_FDCWD, i->path, &file_attr);
if (file_attr & FS_IMMUTABLE_FL)
(void) chattr_path(i->path, 0, FS_IMMUTABLE_FL);
_fallthrough_;
case IMAGE_SUBVOLUME:
r = file_in_same_dir(i->path, new_name, &new_path);
break;
case IMAGE_BLOCK:
/* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */
if (path_startswith(i->path, "/dev"))
return -EROFS;
r = file_in_same_dir(i->path, new_name, &new_path);
break;
case IMAGE_RAW: {
const char *fn;
fn = strjoina(new_name, ".raw");
r = file_in_same_dir(i->path, fn, &new_path);
break;
}
default:
return -EOPNOTSUPP;
}
if (r < 0)
return r;
nn = strdup(new_name);
if (!nn)
return -ENOMEM;
r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path);
if (r < 0)
return r;
/* Restore the immutable bit, if it was set before */
if (file_attr & FS_IMMUTABLE_FL)
(void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL);
free_and_replace(i->path, new_path);
free_and_replace(i->name, nn);
STRV_FOREACH(j, settings) {
r = rename_auxiliary_file(*j, new_name, ".nspawn");
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j);
}
r = rename_auxiliary_file(roothash, new_name, ".roothash");
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash);
return 0;
}
static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) {
_cleanup_free_ char *fn = NULL, *rs = NULL;
int r;
fn = strjoin(new_name, suffix);
if (!fn)
return -ENOMEM;
r = file_in_same_dir(path, fn, &rs);
if (r < 0)
return r;
return copy_file_atomic(path, rs, 0664, COPY_REFLINK);
}
static int get_pool_directory(
RuntimeScope scope,
ImageClass class,
const char *fname,
const char *suffix,
char **ret) {
int r;
assert(scope >= 0);
assert(scope < _RUNTIME_SCOPE_MAX);
assert(class >= 0);
assert(class < _IMAGE_CLASS_MAX);
assert(ret);
_cleanup_free_ char *root = NULL;
switch (scope) {
case RUNTIME_SCOPE_SYSTEM:
r = sd_path_lookup(SD_PATH_SYSTEM_STATE_PRIVATE, /* suffix= */ NULL, &root);
break;
case RUNTIME_SCOPE_USER:
r = sd_path_lookup(SD_PATH_USER_STATE_PRIVATE, /* suffix= */ NULL, &root);
break;
default:
return -EOPNOTSUPP;
}
if (r < 0)
return r;
const char *n = image_dirname_to_string(class);
if (!n)
return -EOPNOTSUPP;
_cleanup_free_ char *j = NULL;
const char *fn;
if (fname && suffix) {
j = strjoin(fname, suffix);
if (!j)
return -ENOMEM;
fn = j;
} else
fn = fname ?: suffix;
_cleanup_free_ char *p = path_join(root, n, fn);
if (!p)
return -ENOMEM;
*ret = TAKE_PTR(p);
return 0;
}
int image_clone(Image *i, const char *new_name, bool read_only, RuntimeScope scope) {
_cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT;
_cleanup_strv_free_ char **settings = NULL;
_cleanup_free_ char *roothash = NULL;
int r;
assert(i);
if (!image_name_is_valid(new_name))
return -EINVAL;
settings = image_settings_path(i, scope);
if (!settings)
return -ENOMEM;
r = image_roothash_path(i, &roothash);
if (r < 0)
return r;
/* Make sure nobody takes the new name, between the time we
* checked it is currently unused in all search paths, and the
* time we take possession of it */
r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock);
if (r < 0)
return r;
r = image_find(scope, i->class, new_name, NULL, NULL);
if (r >= 0)
return -EEXIST;
if (r != -ENOENT)
return r;
switch (i->type) {
case IMAGE_SUBVOLUME:
case IMAGE_DIRECTORY: {
/* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain
* directory. */
_cleanup_free_ char *new_path = NULL;
r = get_pool_directory(scope, i->class, new_name, /* suffix= */ NULL, &new_path);
if (r < 0)
return r;
r = btrfs_subvol_snapshot_at(AT_FDCWD, i->path, AT_FDCWD, new_path,
(read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
BTRFS_SNAPSHOT_FALLBACK_COPY |
BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
BTRFS_SNAPSHOT_RECURSIVE |
BTRFS_SNAPSHOT_QUOTA);
if (r >= 0)
/* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */
(void) btrfs_subvol_auto_qgroup(new_path, 0, true);
break;
}
case IMAGE_RAW: {
_cleanup_free_ char *new_path = NULL;
r = get_pool_directory(scope, i->class, new_name, ".raw", &new_path);
if (r < 0)
return r;
r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644,
COPY_REFLINK|COPY_CRTIME|COPY_NOCOW_AFTER);
break;
}
case IMAGE_BLOCK:
default:
return -EOPNOTSUPP;
}
if (r < 0)
return r;
STRV_FOREACH(j, settings) {
r = clone_auxiliary_file(*j, new_name, ".nspawn");
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j);
}
r = clone_auxiliary_file(roothash, new_name, ".roothash");
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash);
return 0;
}
int image_read_only(Image *i, bool b) {
_cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT;
int r;
assert(i);
if (image_is_vendor(i) || image_is_host(i))
return -EROFS;
/* Make sure we don't interfere with a running nspawn */
r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock);
if (r < 0)
return r;
switch (i->type) {
case IMAGE_SUBVOLUME:
/* Note that we set the flag only on the top-level
* subvolume of the image. */
r = btrfs_subvol_set_read_only(i->path, b);
if (r < 0)
return r;
break;
case IMAGE_DIRECTORY:
/* For simple directory trees we cannot use the access
mode of the top-level directory, since it has an
effect on the container itself. However, we can
use the "immutable" flag, to at least make the
top-level directory read-only. It's not as good as
a read-only subvolume, but at least something, and
we can read the value back. */
r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL);
if (r < 0)
return r;
break;
case IMAGE_RAW: {
struct stat st;
if (stat(i->path, &st) < 0)
return -errno;
if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0)
return -errno;
/* If the images is now read-only, it's a good time to
* defrag it, given that no write patterns will
* fragment it again. */
if (b)
(void) btrfs_defrag(i->path);
break;
}
case IMAGE_BLOCK: {
_cleanup_close_ int fd = -EBADF;
struct stat st;
int state = b;
fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY);
if (fd < 0)
return -errno;
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISBLK(st.st_mode))
return -ENOTTY;
if (ioctl(fd, BLKROSET, &state) < 0)
return -errno;
break;
}
default:
return -EOPNOTSUPP;
}
i->read_only = b;
return 0;
}
static void make_lock_dir(void) {
(void) mkdir_p("/run/systemd/nspawn", 0755);
(void) mkdir("/run/systemd/nspawn/locks", 0700);
}
int image_path_lock(
const char *path,
int operation,
LockFile *ret_global,
LockFile *ret_local) {
_cleanup_free_ char *p = NULL;
LockFile t = LOCK_FILE_INIT;
struct stat st;
bool exclusive;
int r;
assert(path);
assert(ret_local);
/* Locks an image path. This actually creates two locks: one "local" one, next to the image path
* itself, which might be shared via NFS. And another "global" one, in /run, that uses the
* device/inode number. This has the benefit that we can even lock a tree that is a mount point,
* correctly. */
if (!path_is_absolute(path))
return -EINVAL;
switch (operation & (LOCK_SH|LOCK_EX)) {
case LOCK_SH:
exclusive = false;
break;
case LOCK_EX:
exclusive = true;
break;
default:
return -EINVAL;
}
if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
*ret_local = LOCK_FILE_INIT;
if (ret_global)
*ret_global = LOCK_FILE_INIT;
return 0;
}
/* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are
* running off it after all, and we don't want any images to manipulate the host image. We make an
* exception for shared locks however: we allow those (and make them NOPs since there's no point in
* taking them if there can't be exclusive locks). Strictly speaking these are questionable as well,
* since it means changes made to the host might propagate to the container as they happen (and a
* shared lock kinda suggests that no changes happen at all while it is in place), but it's too
* useful not to allow read-only containers off the host root, hence let's support this, and trust
* the user to do the right thing with this. */
if (path_equal(path, "/")) {
if (exclusive)
return -EBUSY;
*ret_local = LOCK_FILE_INIT;
if (ret_global)
*ret_global = LOCK_FILE_INIT;
return 0;
}
if (ret_global) {
if (stat(path, &st) >= 0) {
if (S_ISBLK(st.st_mode))
r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev));
else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))
r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino);
else
return -ENOTTY;
if (r < 0)
return -ENOMEM;
}
}
/* For block devices we don't need the "local" lock, as the major/minor lock above should be
* sufficient, since block devices are host local anyway. */
if (!path_startswith(path, "/dev/")) {
r = make_lock_file_for(path, operation, &t);
if (r < 0) {
if (!exclusive && r == -EROFS)
log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path);
else
return r;
}
}
if (p) {
make_lock_dir();
r = make_lock_file(p, operation, ret_global);
if (r < 0) {
release_lock_file(&t);
return r;
}
} else if (ret_global)
*ret_global = LOCK_FILE_INIT;
*ret_local = t;
return 0;
}
int image_set_limit(Image *i, uint64_t referenced_max) {
int r;
assert(i);
if (image_is_vendor(i) || image_is_host(i))
return -EROFS;
if (i->type != IMAGE_SUBVOLUME)
return -EOPNOTSUPP;
/* We set the quota both for the subvolume as well as for the
* subtree. The latter is mostly for historical reasons, since
* we didn't use to have a concept of subtree quota, and hence
* only modified the subvolume quota. */
(void) btrfs_qgroup_set_limit(i->path, 0, referenced_max);
(void) btrfs_subvol_auto_qgroup(i->path, 0, true);
r = btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max);
if (r < 0)
return r;
(void) image_update_quota(i, -EBADF);
return 0;
}
int image_set_pool_limit(RuntimeScope scope, ImageClass class, uint64_t referenced_max) {
int r;
assert(scope >= 0 && scope < _RUNTIME_SCOPE_MAX);
assert(class >= 0 && class < _IMAGE_CLASS_MAX);
_cleanup_free_ char *pool = NULL;
r = get_pool_directory(scope, class, /* fname= */ NULL, /* suffix= */ NULL, &pool);
if (r < 0)
return r;
r = btrfs_qgroup_set_limit(pool, /* qgroupid = */ 0, referenced_max);
if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
return r;
if (r < 0)
log_debug_errno(r, "Failed to set limit on btrfs quota group for '%s', ignoring: %m", pool);
r = btrfs_subvol_set_subtree_quota_limit(pool, /* subvol_id = */ 0, referenced_max);
if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
return r;
if (r < 0)
return log_debug_errno(r, "Failed to set subtree quota limit for '%s': %m", pool);
return 0;
}
int image_read_metadata(Image *i, const ImagePolicy *image_policy) {
_cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT;
int r;
assert(i);
r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock);
if (r < 0)
return r;
switch (i->type) {
case IMAGE_SUBVOLUME:
case IMAGE_DIRECTORY: {
_cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **sysext_release = NULL, **confext_release = NULL;
_cleanup_free_ char *hostname = NULL, *path = NULL;
sd_id128_t machine_id = SD_ID128_NULL;
if (i->class == IMAGE_SYSEXT) {
r = extension_has_forbidden_content(i->path);
if (r < 0)
return r;
if (r > 0)
return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
"Conflicting content found in image %s, refusing.",
i->name);
}
r = chase("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL);
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name);
else if (r >= 0) {
r = read_etc_hostname(path, /* substitute_wildcards= */ false, &hostname);
if (r < 0)
log_debug_errno(r, "Failed to read /etc/hostname of image %s: %m", i->name);
}
path = mfree(path);
r = id128_get_machine(i->path, &machine_id);
if (r < 0)
log_debug_errno(r, "Failed to read machine ID in image %s, ignoring: %m", i->name);
r = chase("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL);
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name);
else if (r >= 0) {
r = load_env_file_pairs(NULL, path, &machine_info);
if (r < 0)
log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name);
}
r = load_os_release_pairs(i->path, &os_release);
if (r < 0)
log_debug_errno(r, "Failed to read os-release in image, ignoring: %m");
r = load_extension_release_pairs(i->path, IMAGE_SYSEXT, i->name, /* relax_extension_release_check= */ false, &sysext_release);
if (r < 0)
log_debug_errno(r, "Failed to read sysext-release in image, ignoring: %m");
r = load_extension_release_pairs(i->path, IMAGE_CONFEXT, i->name, /* relax_extension_release_check= */ false, &confext_release);
if (r < 0)
log_debug_errno(r, "Failed to read confext-release in image, ignoring: %m");
free_and_replace(i->hostname, hostname);
i->machine_id = machine_id;
strv_free_and_replace(i->machine_info, machine_info);
strv_free_and_replace(i->os_release, os_release);
strv_free_and_replace(i->sysext_release, sysext_release);
strv_free_and_replace(i->confext_release, confext_release);
break;
}
case IMAGE_RAW:
case IMAGE_BLOCK: {
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
DissectImageFlags flags =
DISSECT_IMAGE_GENERIC_ROOT |
DISSECT_IMAGE_REQUIRE_ROOT |
DISSECT_IMAGE_RELAX_VAR_CHECK |
DISSECT_IMAGE_READ_ONLY |
DISSECT_IMAGE_USR_NO_ROOT |
DISSECT_IMAGE_ADD_PARTITION_DEVICES |
DISSECT_IMAGE_PIN_PARTITION_DEVICES |
DISSECT_IMAGE_VALIDATE_OS |
DISSECT_IMAGE_VALIDATE_OS_EXT |
DISSECT_IMAGE_ALLOW_USERSPACE_VERITY;
r = loop_device_make_by_path(
i->path,
O_RDONLY,
/* sector_size= */ UINT32_MAX,
LO_FLAGS_PARTSCAN,
LOCK_SH,
&d);
if (r < 0)
return r;
r = dissect_loop_device(
d,
/* verity= */ NULL,
/* mount_options= */ NULL,
image_policy,
/* image_filter= */ NULL,
flags,
&m);
if (r < 0)
return r;
r = dissected_image_acquire_metadata(
m,
/* userns_fd= */ -EBADF,
flags);
if (r < 0)
return r;
free_and_replace(i->hostname, m->hostname);
i->machine_id = m->machine_id;
strv_free_and_replace(i->machine_info, m->machine_info);
strv_free_and_replace(i->os_release, m->os_release);
strv_free_and_replace(i->sysext_release, m->sysext_release);
strv_free_and_replace(i->confext_release, m->confext_release);
break;
}
default:
return -EOPNOTSUPP;
}
i->metadata_valid = true;
return 0;
}
int image_name_lock(const char *name, int operation, LockFile *ret) {
const char *p;
assert(name);
assert(ret);
/* Locks an image name, regardless of the precise path used. */
if (streq(name, ".host"))
return -EBUSY;
if (!image_name_is_valid(name))
return -EINVAL;
if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
*ret = (LockFile) LOCK_FILE_INIT;
return 0;
}
make_lock_dir();
p = strjoina("/run/systemd/nspawn/locks/name-", name);
return make_lock_file(p, operation, ret);
}
bool image_in_search_path(
RuntimeScope scope,
ImageClass class,
const char *root,
const char *image) {
int r;
assert(scope < _RUNTIME_SCOPE_MAX && scope != RUNTIME_SCOPE_GLOBAL);
assert(class >= 0);
assert(class < _IMAGE_CLASS_MAX);
assert(image);
_cleanup_strv_free_ char **search = NULL;
r = pick_image_search_path(scope, class, &search);
if (r < 0)
return r;
STRV_FOREACH(path, search) {
const char *p, *q;
size_t k;
if (!empty_or_root(root)) {
q = path_startswith(*path, root);
if (!q)
continue;
} else
q = *path;
p = path_startswith(q, *path);
if (!p)
continue;
/* Make sure there's a filename following */
k = strcspn(p, "/");
if (k == 0)
continue;
p += k;
/* Accept trailing slashes */
if (p[strspn(p, "/")] == 0)
return true;
}
return false;
}
bool image_is_vendor(const struct Image *i) {
assert(i);
return i->path && path_startswith(i->path, "/usr");
}
bool image_is_host(const struct Image *i) {
assert(i);
if (i->name && streq(i->name, ".host"))
return true;
if (i->path && path_equal(i->path, "/"))
return true;
return false;
}
int image_to_json(const struct Image *img, sd_json_variant **ret) {
assert(img);
return sd_json_buildo(
ret,
SD_JSON_BUILD_PAIR_STRING("Type", image_type_to_string(img->type)),
SD_JSON_BUILD_PAIR_STRING("Class", image_class_to_string(img->class)),
SD_JSON_BUILD_PAIR_STRING("Name", img->name),
SD_JSON_BUILD_PAIR_CONDITION(!!img->path, "Path", SD_JSON_BUILD_STRING(img->path)),
SD_JSON_BUILD_PAIR_BOOLEAN("ReadOnly", img->read_only),
SD_JSON_BUILD_PAIR_CONDITION(img->crtime != 0, "CreationTimestamp", SD_JSON_BUILD_UNSIGNED(img->crtime)),
SD_JSON_BUILD_PAIR_CONDITION(img->mtime != 0, "ModificationTimestamp", SD_JSON_BUILD_UNSIGNED(img->mtime)),
SD_JSON_BUILD_PAIR_CONDITION(img->usage != UINT64_MAX, "Usage", SD_JSON_BUILD_UNSIGNED(img->usage)),
SD_JSON_BUILD_PAIR_CONDITION(img->usage_exclusive != UINT64_MAX, "UsageExclusive", SD_JSON_BUILD_UNSIGNED(img->usage_exclusive)),
SD_JSON_BUILD_PAIR_CONDITION(img->limit != UINT64_MAX, "Limit", SD_JSON_BUILD_UNSIGNED(img->limit)),
SD_JSON_BUILD_PAIR_CONDITION(img->limit_exclusive != UINT64_MAX, "LimitExclusive", SD_JSON_BUILD_UNSIGNED(img->limit_exclusive)));
}
static const char* const image_type_table[_IMAGE_TYPE_MAX] = {
[IMAGE_DIRECTORY] = "directory",
[IMAGE_SUBVOLUME] = "subvolume",
[IMAGE_RAW] = "raw",
[IMAGE_BLOCK] = "block",
};
DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType);
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