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-rw-r--r--src/shared/machine-image.c817
1 files changed, 0 insertions, 817 deletions
diff --git a/src/shared/machine-image.c b/src/shared/machine-image.c
deleted file mode 100644
index 060f8d50c7..0000000000
--- a/src/shared/machine-image.c
+++ /dev/null
@@ -1,817 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <linux/fs.h>
-#include "alloc-util.h"
-#include "btrfs-util.h"
-#include "chattr-util.h"
-#include "copy.h"
-#include "dirent-util.h"
-#include "fd-util.h"
-#include "fs-util.h"
-#include "hashmap.h"
-#include "lockfile-util.h"
-#include "log.h"
-#include "macro.h"
-#include "machine-image.h"
-#include "mkdir.h"
-#include "path-util.h"
-#include "rm-rf.h"
-#include "string-table.h"
-#include "string-util.h"
-#include "strv.h"
-#include "time-util.h"
-#include "utf8.h"
-#include "util.h"
-#include "xattr-util.h"
-
-static const char image_search_path[] =
- "/var/lib/machines\0"
- "/var/lib/container\0" /* legacy */
- "/usr/local/lib/machines\0"
- "/usr/lib/machines\0";
-
-Image *image_unref(Image *i) {
- if (!i)
- return NULL;
-
- free(i->name);
- free(i->path);
- return mfree(i);
-}
-
-static char **image_settings_path(Image *image) {
- _cleanup_strv_free_ char **l = NULL;
- char **ret;
- const char *fn, *s;
- unsigned i = 0;
-
- assert(image);
-
- l = new0(char*, 4);
- if (!l)
- return NULL;
-
- fn = strjoina(image->name, ".nspawn");
-
- FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") {
- l[i] = strappend(s, fn);
- if (!l[i])
- return NULL;
-
- i++;
- }
-
- l[i] = file_in_same_dir(image->path, fn);
- if (!l[i])
- return NULL;
-
- ret = l;
- l = NULL;
-
- return ret;
-}
-
-static int image_new(
- ImageType t,
- 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 = new0(Image, 1);
- if (!i)
- return -ENOMEM;
-
- i->type = t;
- i->read_only = read_only;
- i->crtime = crtime;
- i->mtime = mtime;
- i->usage = i->usage_exclusive = (uint64_t) -1;
- i->limit = i->limit_exclusive = (uint64_t) -1;
-
- i->name = strdup(pretty);
- if (!i->name)
- return -ENOMEM;
-
- if (path)
- i->path = strjoin(path, "/", filename, NULL);
- else
- i->path = strdup(filename);
-
- if (!i->path)
- return -ENOMEM;
-
- path_kill_slashes(i->path);
-
- *ret = i;
- i = NULL;
-
- return 0;
-}
-
-static int image_make(
- const char *pretty,
- int dfd,
- const char *path,
- const char *filename,
- Image **ret) {
-
- struct stat st;
- bool read_only;
- int r;
-
- assert(filename);
-
- /* We explicitly *do* follow symlinks here, since we want to
- * allow symlinking trees into /var/lib/machines/, and treat
- * them normally. */
-
- if (fstatat(dfd, filename, &st, 0) < 0)
- return -errno;
-
- read_only =
- (path && path_startswith(path, "/usr")) ||
- (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS);
-
- if (S_ISDIR(st.st_mode)) {
- _cleanup_close_ int fd = -1;
- unsigned file_attr = 0;
-
- if (!ret)
- return 1;
-
- if (!pretty)
- pretty = filename;
-
- fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY);
- if (fd < 0)
- return -errno;
-
- /* btrfs subvolumes have inode 256 */
- if (st.st_ino == 256) {
-
- r = btrfs_is_filesystem(fd);
- if (r < 0)
- return r;
- if (r) {
- 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,
- pretty,
- path,
- filename,
- info.read_only || read_only,
- info.otime,
- 0,
- ret);
- if (r < 0)
- return r;
-
- if (btrfs_quota_scan_ongoing(fd) == 0) {
- BtrfsQuotaInfo quota;
-
- r = btrfs_subvol_get_subtree_quota_fd(fd, 0, &quota);
- if (r >= 0) {
- (*ret)->usage = quota.referenced;
- (*ret)->usage_exclusive = quota.exclusive;
-
- (*ret)->limit = quota.referenced_max;
- (*ret)->limit_exclusive = quota.exclusive_max;
- }
- }
-
- return 1;
- }
- }
-
- /* 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,
- pretty,
- path,
- filename,
- read_only || (file_attr & FS_IMMUTABLE_FL),
- 0,
- 0,
- ret);
- if (r < 0)
- return r;
-
- return 1;
-
- } else if (S_ISREG(st.st_mode) && endswith(filename, ".raw")) {
- usec_t crtime = 0;
-
- /* It's a RAW disk image */
-
- if (!ret)
- return 1;
-
- fd_getcrtime_at(dfd, filename, &crtime, 0);
-
- if (!pretty)
- pretty = strndupa(filename, strlen(filename) - 4);
-
- r = image_new(IMAGE_RAW,
- pretty,
- 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 1;
- }
-
- return 0;
-}
-
-int image_find(const char *name, Image **ret) {
- const char *path;
- int r;
-
- assert(name);
-
- /* There are no images with invalid names */
- if (!image_name_is_valid(name))
- return 0;
-
- NULSTR_FOREACH(path, image_search_path) {
- _cleanup_closedir_ DIR *d = NULL;
-
- d = opendir(path);
- if (!d) {
- if (errno == ENOENT)
- continue;
-
- return -errno;
- }
-
- r = image_make(NULL, dirfd(d), path, name, ret);
- if (r == 0 || r == -ENOENT) {
- _cleanup_free_ char *raw = NULL;
-
- raw = strappend(name, ".raw");
- if (!raw)
- return -ENOMEM;
-
- r = image_make(NULL, dirfd(d), path, raw, ret);
- if (r == 0 || r == -ENOENT)
- continue;
- }
- if (r < 0)
- return r;
-
- return 1;
- }
-
- if (streq(name, ".host"))
- return image_make(".host", AT_FDCWD, NULL, "/", ret);
-
- return 0;
-};
-
-int image_discover(Hashmap *h) {
- const char *path;
- int r;
-
- assert(h);
-
- NULSTR_FOREACH(path, image_search_path) {
- _cleanup_closedir_ DIR *d = NULL;
- struct dirent *de;
-
- d = opendir(path);
- if (!d) {
- if (errno == ENOENT)
- continue;
-
- return -errno;
- }
-
- FOREACH_DIRENT_ALL(de, d, return -errno) {
- _cleanup_(image_unrefp) Image *image = NULL;
-
- if (!image_name_is_valid(de->d_name))
- continue;
-
- if (hashmap_contains(h, de->d_name))
- continue;
-
- r = image_make(NULL, dirfd(d), path, de->d_name, &image);
- if (r == 0 || r == -ENOENT)
- continue;
- if (r < 0)
- return r;
-
- r = hashmap_put(h, image->name, image);
- if (r < 0)
- return r;
-
- image = NULL;
- }
- }
-
- if (!hashmap_contains(h, ".host")) {
- _cleanup_(image_unrefp) Image *image = NULL;
-
- r = image_make(".host", AT_FDCWD, NULL, "/", &image);
- if (r < 0)
- return r;
-
- r = hashmap_put(h, image->name, image);
- if (r < 0)
- return r;
-
- image = NULL;
-
- }
-
- return 0;
-}
-
-void image_hashmap_free(Hashmap *map) {
- Image *i;
-
- while ((i = hashmap_steal_first(map)))
- image_unref(i);
-
- hashmap_free(map);
-}
-
-int image_remove(Image *i) {
- _cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT;
- _cleanup_strv_free_ char **settings = NULL;
- char **j;
- int r;
-
- assert(i);
-
- if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i))
- return -EROFS;
-
- settings = image_settings_path(i);
- if (!settings)
- return -ENOMEM;
-
- /* 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:
- 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_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);
- }
-
- return 0;
-}
-
-static int rename_settings_file(const char *path, const char *new_name) {
- _cleanup_free_ char *rs = NULL;
- const char *fn;
-
- fn = strjoina(new_name, ".nspawn");
-
- rs = file_in_same_dir(path, fn);
- if (!rs)
- return -ENOMEM;
-
- return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs);
-}
-
-int image_rename(Image *i, const char *new_name) {
- _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;
- _cleanup_strv_free_ char **settings = NULL;
- unsigned file_attr = 0;
- char **j;
- 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);
- if (!settings)
- return -ENOMEM;
-
- /* 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(new_name, NULL);
- if (r < 0)
- return r;
- if (r > 0)
- return -EEXIST;
-
- 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_path(i->path, &file_attr);
-
- if (file_attr & FS_IMMUTABLE_FL)
- (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL);
-
- /* fall through */
-
- case IMAGE_SUBVOLUME:
- new_path = file_in_same_dir(i->path, new_name);
- break;
-
- case IMAGE_RAW: {
- const char *fn;
-
- fn = strjoina(new_name, ".raw");
- new_path = file_in_same_dir(i->path, fn);
- break;
- }
-
- default:
- return -EOPNOTSUPP;
- }
-
- if (!new_path)
- return -ENOMEM;
-
- 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(i->path);
- i->path = new_path;
- new_path = NULL;
-
- free(i->name);
- i->name = nn;
- nn = NULL;
-
- STRV_FOREACH(j, settings) {
- r = rename_settings_file(*j, new_name);
- if (r < 0 && r != -ENOENT)
- log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j);
- }
-
- return 0;
-}
-
-static int clone_settings_file(const char *path, const char *new_name) {
- _cleanup_free_ char *rs = NULL;
- const char *fn;
-
- fn = strjoina(new_name, ".nspawn");
-
- rs = file_in_same_dir(path, fn);
- if (!rs)
- return -ENOMEM;
-
- return copy_file_atomic(path, rs, 0664, false, 0);
-}
-
-int image_clone(Image *i, const char *new_name, bool read_only) {
- _cleanup_release_lock_file_ LockFile name_lock = LOCK_FILE_INIT;
- _cleanup_strv_free_ char **settings = NULL;
- const char *new_path;
- char **j;
- int r;
-
- assert(i);
-
- if (!image_name_is_valid(new_name))
- return -EINVAL;
-
- settings = image_settings_path(i);
- if (!settings)
- return -ENOMEM;
-
- /* 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(new_name, NULL);
- if (r < 0)
- return r;
- if (r > 0)
- return -EEXIST;
-
- 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.*/
-
- new_path = strjoina("/var/lib/machines/", new_name);
-
- r = btrfs_subvol_snapshot(i->path, new_path, (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE | BTRFS_SNAPSHOT_QUOTA);
- if (r == -EOPNOTSUPP) {
- /* No btrfs snapshots supported, create a normal directory then. */
-
- r = copy_directory(i->path, new_path, false);
- if (r >= 0)
- (void) chattr_path(new_path, read_only ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL);
- } else 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:
- new_path = strjoina("/var/lib/machines/", new_name, ".raw");
-
- r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, false, FS_NOCOW_FL);
- break;
-
- default:
- return -EOPNOTSUPP;
- }
-
- if (r < 0)
- return r;
-
- STRV_FOREACH(j, settings) {
- r = clone_settings_file(*j, new_name);
- if (r < 0 && r != -ENOENT)
- log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j);
- }
-
- 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;
- }
-
- default:
- return -EOPNOTSUPP;
- }
-
- return 0;
-}
-
-int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) {
- _cleanup_free_ char *p = NULL;
- LockFile t = LOCK_FILE_INIT;
- struct stat st;
- int r;
-
- assert(path);
- assert(global);
- assert(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_equal(path, "/"))
- return -EBUSY;
-
- if (!path_is_absolute(path))
- return -EINVAL;
-
- if (stat(path, &st) >= 0) {
- if (asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
- return -ENOMEM;
- }
-
- r = make_lock_file_for(path, operation, &t);
- if (r < 0)
- return r;
-
- if (p) {
- mkdir_p("/run/systemd/nspawn/locks", 0700);
-
- r = make_lock_file(p, operation, global);
- if (r < 0) {
- release_lock_file(&t);
- return r;
- }
- }
-
- *local = t;
- return 0;
-}
-
-int image_set_limit(Image *i, uint64_t referenced_max) {
- 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);
- return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max);
-}
-
-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 (!image_name_is_valid(name))
- return -EINVAL;
-
- if (streq(name, ".host"))
- return -EBUSY;
-
- mkdir_p("/run/systemd/nspawn/locks", 0700);
- p = strjoina("/run/systemd/nspawn/locks/name-", name);
-
- return make_lock_file(p, operation, ret);
-}
-
-bool image_name_is_valid(const char *s) {
- if (!filename_is_valid(s))
- return false;
-
- if (string_has_cc(s, NULL))
- return false;
-
- if (!utf8_is_valid(s))
- return false;
-
- /* Temporary files for atomically creating new files */
- if (startswith(s, ".#"))
- return false;
-
- return true;
-}
-
-static const char* const image_type_table[_IMAGE_TYPE_MAX] = {
- [IMAGE_DIRECTORY] = "directory",
- [IMAGE_SUBVOLUME] = "subvolume",
- [IMAGE_RAW] = "raw",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 13:11:00 +0000