1080 lines
34 KiB
C
1080 lines
34 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <linux/fs.h>
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#include "alloc-util.h"
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#include "btrfs-util.h"
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#include "chattr-util.h"
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#include "copy.h"
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#include "dirent-util.h"
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#include "dissect-image.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "hashmap.h"
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#include "hostname-util.h"
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#include "id128-util.h"
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#include "lockfile-util.h"
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#include "log.h"
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#include "loop-util.h"
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#include "machine-image.h"
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#include "macro.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "rm-rf.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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#include "utf8.h"
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#include "util.h"
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#include "xattr-util.h"
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static const char image_search_path[] =
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"/var/lib/machines\0"
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"/var/lib/container\0" /* legacy */
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"/usr/local/lib/machines\0"
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"/usr/lib/machines\0";
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Image *image_unref(Image *i) {
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if (!i)
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return NULL;
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free(i->name);
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free(i->path);
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free(i->hostname);
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strv_free(i->machine_info);
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strv_free(i->os_release);
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return mfree(i);
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}
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static char **image_settings_path(Image *image) {
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_cleanup_strv_free_ char **l = NULL;
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const char *fn, *s;
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unsigned i = 0;
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assert(image);
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l = new0(char*, 4);
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if (!l)
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return NULL;
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fn = strjoina(image->name, ".nspawn");
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FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") {
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l[i] = strappend(s, fn);
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if (!l[i])
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return NULL;
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i++;
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}
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l[i] = file_in_same_dir(image->path, fn);
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if (!l[i])
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return NULL;
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return TAKE_PTR(l);
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}
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static char *image_roothash_path(Image *image) {
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const char *fn;
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assert(image);
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fn = strjoina(image->name, ".roothash");
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return file_in_same_dir(image->path, fn);
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}
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static int image_new(
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ImageType t,
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const char *pretty,
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const char *path,
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const char *filename,
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bool read_only,
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usec_t crtime,
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usec_t mtime,
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Image **ret) {
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_cleanup_(image_unrefp) Image *i = NULL;
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assert(t >= 0);
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assert(t < _IMAGE_TYPE_MAX);
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assert(pretty);
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assert(filename);
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assert(ret);
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i = new0(Image, 1);
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if (!i)
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return -ENOMEM;
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i->type = t;
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i->read_only = read_only;
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i->crtime = crtime;
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i->mtime = mtime;
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i->usage = i->usage_exclusive = (uint64_t) -1;
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i->limit = i->limit_exclusive = (uint64_t) -1;
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i->name = strdup(pretty);
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if (!i->name)
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return -ENOMEM;
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if (path)
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i->path = strjoin(path, "/", filename);
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else
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i->path = strdup(filename);
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if (!i->path)
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return -ENOMEM;
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path_kill_slashes(i->path);
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*ret = i;
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i = NULL;
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return 0;
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}
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static int image_make(
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const char *pretty,
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int dfd,
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const char *path,
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const char *filename,
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Image **ret) {
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struct stat st;
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bool read_only;
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int r;
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assert(filename);
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/* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block
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* devices into /var/lib/machines/, and treat them normally. */
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if (fstatat(dfd, filename, &st, 0) < 0)
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return -errno;
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read_only =
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(path && path_startswith(path, "/usr")) ||
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(faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS);
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if (S_ISDIR(st.st_mode)) {
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_cleanup_close_ int fd = -1;
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unsigned file_attr = 0;
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if (!ret)
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return 1;
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if (!pretty)
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pretty = filename;
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fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY);
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if (fd < 0)
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return -errno;
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/* btrfs subvolumes have inode 256 */
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if (st.st_ino == 256) {
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r = btrfs_is_filesystem(fd);
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if (r < 0)
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return r;
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if (r) {
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BtrfsSubvolInfo info;
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/* It's a btrfs subvolume */
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r = btrfs_subvol_get_info_fd(fd, 0, &info);
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if (r < 0)
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return r;
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r = image_new(IMAGE_SUBVOLUME,
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pretty,
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path,
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filename,
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info.read_only || read_only,
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info.otime,
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0,
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ret);
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if (r < 0)
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return r;
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if (btrfs_quota_scan_ongoing(fd) == 0) {
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BtrfsQuotaInfo quota;
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r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a);
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if (r >= 0) {
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(*ret)->usage = quota.referenced;
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(*ret)->usage_exclusive = quota.exclusive;
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(*ret)->limit = quota.referenced_max;
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(*ret)->limit_exclusive = quota.exclusive_max;
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}
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}
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return 1;
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}
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}
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/* If the IMMUTABLE bit is set, we consider the
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* directory read-only. Since the ioctl is not
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* supported everywhere we ignore failures. */
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(void) read_attr_fd(fd, &file_attr);
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/* It's just a normal directory. */
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r = image_new(IMAGE_DIRECTORY,
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pretty,
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path,
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filename,
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read_only || (file_attr & FS_IMMUTABLE_FL),
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0,
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0,
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ret);
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if (r < 0)
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return r;
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return 1;
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} else if (S_ISREG(st.st_mode) && endswith(filename, ".raw")) {
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usec_t crtime = 0;
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/* It's a RAW disk image */
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if (!ret)
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return 1;
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fd_getcrtime_at(dfd, filename, &crtime, 0);
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if (!pretty)
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pretty = strndupa(filename, strlen(filename) - 4);
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r = image_new(IMAGE_RAW,
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pretty,
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path,
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filename,
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!(st.st_mode & 0222) || read_only,
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crtime,
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timespec_load(&st.st_mtim),
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ret);
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if (r < 0)
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return r;
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(*ret)->usage = (*ret)->usage_exclusive = st.st_blocks * 512;
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(*ret)->limit = (*ret)->limit_exclusive = st.st_size;
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return 1;
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} else if (S_ISBLK(st.st_mode)) {
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_cleanup_close_ int block_fd = -1;
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uint64_t size = UINT64_MAX;
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/* A block device */
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if (!ret)
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return 1;
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if (!pretty)
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pretty = filename;
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block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
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if (block_fd < 0)
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log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename);
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else {
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if (fstat(block_fd, &st) < 0)
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return -errno;
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if (!S_ISBLK(st.st_mode)) /* Verify that what we opened is actually what we think it is */
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return -ENOTTY;
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if (!read_only) {
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int state = 0;
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if (ioctl(block_fd, BLKROGET, &state) < 0)
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log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename);
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else if (state)
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read_only = true;
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}
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if (ioctl(block_fd, BLKGETSIZE64, &size) < 0)
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log_debug_errno(errno, "Failed to issue BLKFLSBUF on device %s/%s, ignoring: %m", path, filename);
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block_fd = safe_close(block_fd);
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}
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r = image_new(IMAGE_BLOCK,
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pretty,
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path,
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filename,
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!(st.st_mode & 0222) || read_only,
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0,
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0,
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ret);
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if (r < 0)
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return r;
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if (size != 0 && size != UINT64_MAX)
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(*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size;
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return 1;
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}
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return 0;
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}
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int image_find(const char *name, Image **ret) {
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const char *path;
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int r;
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assert(name);
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/* There are no images with invalid names */
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if (!image_name_is_valid(name))
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return 0;
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NULSTR_FOREACH(path, image_search_path) {
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_cleanup_closedir_ DIR *d = NULL;
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d = opendir(path);
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if (!d) {
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if (errno == ENOENT)
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continue;
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return -errno;
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}
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r = image_make(NULL, dirfd(d), path, name, ret);
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if (IN_SET(r, 0, -ENOENT)) {
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_cleanup_free_ char *raw = NULL;
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raw = strappend(name, ".raw");
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if (!raw)
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return -ENOMEM;
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r = image_make(NULL, dirfd(d), path, raw, ret);
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if (IN_SET(r, 0, -ENOENT))
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continue;
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}
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if (r < 0)
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return r;
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return 1;
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}
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if (streq(name, ".host"))
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return image_make(".host", AT_FDCWD, NULL, "/", ret);
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return 0;
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};
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int image_discover(Hashmap *h) {
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const char *path;
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int r;
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assert(h);
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NULSTR_FOREACH(path, image_search_path) {
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_cleanup_closedir_ DIR *d = NULL;
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struct dirent *de;
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d = opendir(path);
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if (!d) {
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if (errno == ENOENT)
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continue;
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return -errno;
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}
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FOREACH_DIRENT_ALL(de, d, return -errno) {
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_cleanup_(image_unrefp) Image *image = NULL;
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if (!image_name_is_valid(de->d_name))
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continue;
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if (hashmap_contains(h, de->d_name))
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continue;
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r = image_make(NULL, dirfd(d), path, de->d_name, &image);
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if (IN_SET(r, 0, -ENOENT))
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continue;
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if (r < 0)
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return r;
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r = hashmap_put(h, image->name, image);
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if (r < 0)
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return r;
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image = NULL;
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}
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}
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if (!hashmap_contains(h, ".host")) {
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_cleanup_(image_unrefp) Image *image = NULL;
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r = image_make(".host", AT_FDCWD, NULL, "/", &image);
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if (r < 0)
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return r;
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r = hashmap_put(h, image->name, image);
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if (r < 0)
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return r;
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image = NULL;
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}
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return 0;
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}
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int image_remove(Image *i) {
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_cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT;
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_cleanup_strv_free_ char **settings = NULL;
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_cleanup_free_ char *roothash = NULL;
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char **j;
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int r;
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assert(i);
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if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i))
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return -EROFS;
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settings = image_settings_path(i);
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if (!settings)
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return -ENOMEM;
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roothash = image_roothash_path(i);
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if (!roothash)
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return -ENOMEM;
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/* Make sure we don't interfere with a running nspawn */
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r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock);
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if (r < 0)
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return r;
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switch (i->type) {
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case IMAGE_SUBVOLUME:
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/* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the
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* big guns */
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if (unlink(i->path) < 0) {
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r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
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if (r < 0)
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return r;
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}
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break;
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case IMAGE_DIRECTORY:
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/* Allow deletion of read-only directories */
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(void) chattr_path(i->path, 0, FS_IMMUTABLE_FL);
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r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
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if (r < 0)
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return r;
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break;
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case IMAGE_BLOCK:
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/* If this is inside of /dev, then it's a real block device, hence let's not touch the device node
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* itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink
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* the thing (it's most likely a symlink after all). */
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if (path_startswith(i->path, "/dev"))
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break;
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_fallthrough_;
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case IMAGE_RAW:
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if (unlink(i->path) < 0)
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return -errno;
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break;
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default:
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return -EOPNOTSUPP;
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}
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STRV_FOREACH(j, settings) {
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if (unlink(*j) < 0 && errno != ENOENT)
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log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j);
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}
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if (unlink(roothash) < 0 && errno != ENOENT)
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log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash);
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return 0;
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}
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static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) {
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_cleanup_free_ char *rs = NULL;
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const char *fn;
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fn = strjoina(new_name, suffix);
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rs = file_in_same_dir(path, fn);
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if (!rs)
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return -ENOMEM;
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return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs);
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}
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int image_rename(Image *i, const char *new_name) {
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_cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT;
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_cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL;
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_cleanup_strv_free_ char **settings = NULL;
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unsigned file_attr = 0;
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char **j;
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int r;
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assert(i);
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if (!image_name_is_valid(new_name))
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return -EINVAL;
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if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i))
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return -EROFS;
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settings = image_settings_path(i);
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if (!settings)
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return -ENOMEM;
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roothash = image_roothash_path(i);
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if (!roothash)
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return -ENOMEM;
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/* 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);
|
|
|
|
_fallthrough_;
|
|
case IMAGE_SUBVOLUME:
|
|
new_path = file_in_same_dir(i->path, new_name);
|
|
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;
|
|
|
|
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_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 *rs = NULL;
|
|
const char *fn;
|
|
|
|
fn = strjoina(new_name, suffix);
|
|
|
|
rs = file_in_same_dir(path, fn);
|
|
if (!rs)
|
|
return -ENOMEM;
|
|
|
|
return copy_file_atomic(path, rs, 0664, 0, COPY_REFLINK);
|
|
}
|
|
|
|
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;
|
|
_cleanup_free_ char *roothash = 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;
|
|
|
|
roothash = image_roothash_path(i);
|
|
if (!roothash)
|
|
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_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:
|
|
new_path = strjoina("/var/lib/machines/", new_name, ".raw");
|
|
|
|
r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, COPY_REFLINK);
|
|
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 = -1;
|
|
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;
|
|
}
|
|
|
|
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_is_absolute(path))
|
|
return -EINVAL;
|
|
|
|
if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
|
|
*local = *global = (LockFile) LOCK_FILE_INIT;
|
|
return 0;
|
|
}
|
|
|
|
if (path_equal(path, "/"))
|
|
return -EBUSY;
|
|
|
|
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 device local anyway. */
|
|
if (!path_startswith(path, "/dev")) {
|
|
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;
|
|
}
|
|
} else
|
|
*global = (LockFile) LOCK_FILE_INIT;
|
|
|
|
*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_read_metadata(Image *i) {
|
|
_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;
|
|
sd_id128_t machine_id = SD_ID128_NULL;
|
|
_cleanup_free_ char *hostname = NULL;
|
|
_cleanup_free_ char *path = NULL;
|
|
|
|
r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT, &path);
|
|
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, &hostname);
|
|
if (r < 0)
|
|
log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name);
|
|
}
|
|
|
|
path = mfree(path);
|
|
|
|
r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT, &path);
|
|
if (r < 0 && r != -ENOENT)
|
|
log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name);
|
|
else if (r >= 0) {
|
|
_cleanup_close_ int fd = -1;
|
|
|
|
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
|
if (fd < 0)
|
|
log_debug_errno(errno, "Failed to open %s: %m", path);
|
|
else {
|
|
r = id128_read_fd(fd, ID128_PLAIN, &machine_id);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Image %s contains invalid machine ID.", i->name);
|
|
}
|
|
}
|
|
|
|
path = mfree(path);
|
|
|
|
r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT, &path);
|
|
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, NULL, &machine_info);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name);
|
|
}
|
|
|
|
path = mfree(path);
|
|
|
|
r = chase_symlinks("/etc/os-release", i->path, CHASE_PREFIX_ROOT, &path);
|
|
if (r == -ENOENT)
|
|
r = chase_symlinks("/usr/lib/os-release", i->path, CHASE_PREFIX_ROOT, &path);
|
|
if (r < 0 && r != -ENOENT)
|
|
log_debug_errno(r, "Failed to chase os-release in image: %m");
|
|
else if (r >= 0) {
|
|
r = load_env_file_pairs(NULL, path, NULL, &os_release);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to parse os-release data of %s: %m", i->name);
|
|
}
|
|
|
|
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);
|
|
|
|
break;
|
|
}
|
|
|
|
case IMAGE_RAW:
|
|
case IMAGE_BLOCK: {
|
|
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
|
|
_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
|
|
|
|
r = loop_device_make_by_path(i->path, O_RDONLY, &d);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dissected_image_acquire_metadata(m);
|
|
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);
|
|
|
|
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 (!image_name_is_valid(name))
|
|
return -EINVAL;
|
|
|
|
if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
|
|
*ret = (LockFile) LOCK_FILE_INIT;
|
|
return 0;
|
|
}
|
|
|
|
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",
|
|
[IMAGE_BLOCK] = "block",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType);
|