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-rw-r--r--src/core/machine-id-setup.c258
1 files changed, 0 insertions, 258 deletions
diff --git a/src/core/machine-id-setup.c b/src/core/machine-id-setup.c
deleted file mode 100644
index 76dfcfa6d7..0000000000
--- a/src/core/machine-id-setup.c
+++ /dev/null
@@ -1,258 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright 2010 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 <fcntl.h>
-#include <sched.h>
-#include <sys/mount.h>
-#include <unistd.h>
-
-#include "sd-id128.h"
-
-#include "alloc-util.h"
-#include "fd-util.h"
-#include "fs-util.h"
-#include "id128-util.h"
-#include "log.h"
-#include "machine-id-setup.h"
-#include "macro.h"
-#include "mkdir.h"
-#include "mount-util.h"
-#include "path-util.h"
-#include "process-util.h"
-#include "stat-util.h"
-#include "string-util.h"
-#include "umask-util.h"
-#include "util.h"
-#include "virt.h"
-
-static int generate_machine_id(const char *root, sd_id128_t *ret) {
- const char *dbus_machine_id;
- _cleanup_close_ int fd = -1;
- int r;
-
- assert(ret);
-
- /* First, try reading the D-Bus machine id, unless it is a symlink */
- dbus_machine_id = prefix_roota(root, "/var/lib/dbus/machine-id");
- fd = open(dbus_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fd >= 0) {
- if (id128_read_fd(fd, ID128_PLAIN, ret) >= 0) {
- log_info("Initializing machine ID from D-Bus machine ID.");
- return 0;
- }
-
- fd = safe_close(fd);
- }
-
- if (isempty(root)) {
- /* If that didn't work, see if we are running in a container,
- * and a machine ID was passed in via $container_uuid the way
- * libvirt/LXC does it */
-
- if (detect_container() > 0) {
- _cleanup_free_ char *e = NULL;
-
- if (getenv_for_pid(1, "container_uuid", &e) > 0 &&
- sd_id128_from_string(e, ret) >= 0) {
- log_info("Initializing machine ID from container UUID.");
- return 0;
- }
-
- } else if (detect_vm() == VIRTUALIZATION_KVM) {
-
- /* If we are not running in a container, see if we are
- * running in qemu/kvm and a machine ID was passed in
- * via -uuid on the qemu/kvm command line */
-
- if (id128_read("/sys/class/dmi/id/product_uuid", ID128_UUID, ret) >= 0) {
- log_info("Initializing machine ID from KVM UUID.");
- return 0;
- }
- }
- }
-
- /* If that didn't work, generate a random machine id */
- r = sd_id128_randomize(ret);
- if (r < 0)
- return log_error_errno(r, "Failed to generate randomized : %m");
-
- log_info("Initializing machine ID from random generator.");
- return 0;
-}
-
-int machine_id_setup(const char *root, sd_id128_t machine_id, sd_id128_t *ret) {
- const char *etc_machine_id, *run_machine_id;
- _cleanup_close_ int fd = -1;
- bool writable;
- int r;
-
- etc_machine_id = prefix_roota(root, "/etc/machine-id");
-
- RUN_WITH_UMASK(0000) {
- /* We create this 0444, to indicate that this isn't really
- * something you should ever modify. Of course, since the file
- * will be owned by root it doesn't matter much, but maybe
- * people look. */
-
- (void) mkdir_parents(etc_machine_id, 0755);
- fd = open(etc_machine_id, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
- if (fd < 0) {
- int old_errno = errno;
-
- fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0) {
- if (old_errno == EROFS && errno == ENOENT)
- log_error_errno(errno,
- "System cannot boot: Missing /etc/machine-id and /etc is mounted read-only.\n"
- "Booting up is supported only when:\n"
- "1) /etc/machine-id exists and is populated.\n"
- "2) /etc/machine-id exists and is empty.\n"
- "3) /etc/machine-id is missing and /etc is writable.\n");
- else
- log_error_errno(errno, "Cannot open %s: %m", etc_machine_id);
-
- return -errno;
- }
-
- writable = false;
- } else
- writable = true;
- }
-
- /* A we got a valid machine ID argument, that's what counts */
- if (sd_id128_is_null(machine_id)) {
-
- /* Try to read any existing machine ID */
- if (id128_read_fd(fd, ID128_PLAIN, ret) >= 0)
- return 0;
-
- /* Hmm, so, the id currently stored is not useful, then let's generate one */
- r = generate_machine_id(root, &machine_id);
- if (r < 0)
- return r;
-
- if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
- return log_error_errno(errno, "Failed to seek: %m");
- }
-
- if (writable)
- if (id128_write_fd(fd, ID128_PLAIN, machine_id, true) >= 0)
- goto finish;
-
- fd = safe_close(fd);
-
- /* Hmm, we couldn't write it? So let's write it to /run/machine-id as a replacement */
-
- run_machine_id = prefix_roota(root, "/run/machine-id");
-
- RUN_WITH_UMASK(0022)
- r = id128_write(run_machine_id, ID128_PLAIN, machine_id, false);
- if (r < 0) {
- (void) unlink(run_machine_id);
- return log_error_errno(r, "Cannot write %s: %m", run_machine_id);
- }
-
- /* And now, let's mount it over */
- if (mount(run_machine_id, etc_machine_id, NULL, MS_BIND, NULL) < 0) {
- (void) unlink_noerrno(run_machine_id);
- return log_error_errno(errno, "Failed to mount %s: %m", etc_machine_id);
- }
-
- log_info("Installed transient %s file.", etc_machine_id);
-
- /* Mark the mount read-only */
- if (mount(NULL, etc_machine_id, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, NULL) < 0)
- log_warning_errno(errno, "Failed to make transient %s read-only, ignoring: %m", etc_machine_id);
-
-finish:
- if (ret)
- *ret = machine_id;
-
- return 0;
-}
-
-int machine_id_commit(const char *root) {
- _cleanup_close_ int fd = -1, initial_mntns_fd = -1;
- const char *etc_machine_id;
- sd_id128_t id;
- int r;
-
- /* Replaces a tmpfs bind mount of /etc/machine-id by a proper file, atomically. For this, the umount is removed
- * in a mount namespace, a new file is created at the right place. Afterwards the mount is also removed in the
- * original mount namespace, thus revealing the file that was just created. */
-
- etc_machine_id = prefix_roota(root, "/etc/machine-id");
-
- r = path_is_mount_point(etc_machine_id, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to determine whether %s is a mount point: %m", etc_machine_id);
- if (r == 0) {
- log_debug("%s is not a mount point. Nothing to do.", etc_machine_id);
- return 0;
- }
-
- /* Read existing machine-id */
- fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0)
- return log_error_errno(errno, "Cannot open %s: %m", etc_machine_id);
-
- r = fd_is_temporary_fs(fd);
- if (r < 0)
- return log_error_errno(r, "Failed to determine whether %s is on a temporary file system: %m", etc_machine_id);
- if (r == 0) {
- log_error("%s is not on a temporary file system.", etc_machine_id);
- return -EROFS;
- }
-
- r = id128_read_fd(fd, ID128_PLAIN, &id);
- if (r < 0)
- return log_error_errno(r, "We didn't find a valid machine ID in %s.", etc_machine_id);
-
- fd = safe_close(fd);
-
- /* Store current mount namespace */
- r = namespace_open(0, NULL, &initial_mntns_fd, NULL, NULL, NULL);
- if (r < 0)
- return log_error_errno(r, "Can't fetch current mount namespace: %m");
-
- /* Switch to a new mount namespace, isolate ourself and unmount etc_machine_id in our new namespace */
- if (unshare(CLONE_NEWNS) < 0)
- return log_error_errno(errno, "Failed to enter new namespace: %m");
-
- if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0)
- return log_error_errno(errno, "Couldn't make-rslave / mountpoint in our private namespace: %m");
-
- if (umount(etc_machine_id) < 0)
- return log_error_errno(errno, "Failed to unmount transient %s file in our private namespace: %m", etc_machine_id);
-
- /* Update a persistent version of etc_machine_id */
- r = id128_write(etc_machine_id, ID128_PLAIN, id, true);
- if (r < 0)
- return log_error_errno(r, "Cannot write %s. This is mandatory to get a persistent machine ID: %m", etc_machine_id);
-
- /* Return to initial namespace and proceed a lazy tmpfs unmount */
- r = namespace_enter(-1, initial_mntns_fd, -1, -1, -1);
- if (r < 0)
- return log_warning_errno(r, "Failed to switch back to initial mount namespace: %m.\nWe'll keep transient %s file until next reboot.", etc_machine_id);
-
- if (umount2(etc_machine_id, MNT_DETACH) < 0)
- return log_warning_errno(errno, "Failed to unmount transient %s file: %m.\nWe keep that mount until next reboot.", etc_machine_id);
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-07 01:54:22 +0000