src/core/machine-id-setup.c

	machine-id-setup.c revision 08e1fb68d78b4adf26cce8387fc428b9e370bcf4
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen/***
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  This file is part of systemd.
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  Copyright 2010 Lennart Poettering
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  systemd is free software; you can redistribute it and/or modify it
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  under the terms of the GNU Lesser General Public License as published by
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  the Free Software Foundation; either version 2.1 of the License, or
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  (at your option) any later version.
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  systemd is distributed in the hope that it will be useful, but
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  WITHOUT ANY WARRANTY; without even the implied warranty of
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  Lesser General Public License for more details.
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  You should have received a copy of the GNU Lesser General Public License
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen  along with systemd; If not, see <http://www.gnu.org/licenses/>.
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen***/
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <unistd.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <stdio.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <errno.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <string.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <stdlib.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <fcntl.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include <sys/mount.h>
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
268200a84e420471f8a30824b4f3e371b601d089slive#include <systemd/sd-id128.h>
268200a84e420471f8a30824b4f3e371b601d089slive
268200a84e420471f8a30824b4f3e371b601d089slive#include "machine-id-setup.h"
268200a84e420471f8a30824b4f3e371b601d089slive#include "macro.h"
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include "util.h"
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include "mkdir.h"
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include "log.h"
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen#include "virt.h"
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowenstatic int shorten_uuid(char destination[36], const char *source) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        unsigned i, j;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        for (i = 0, j = 0; i < 36 && j < 32; i++) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                int t;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                t = unhexchar(source[i]);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (t < 0)
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        continue;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                destination[j++] = hexchar(t);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (i == 36 && j == 32) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                destination[32] = '\n';
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                destination[33] = 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                return 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        return -EINVAL;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen}
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowenstatic int generate(char id[34]) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        int fd, r;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        unsigned char *p;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        sd_id128_t buf;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        char *q;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        ssize_t k;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        const char *vm_id;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        assert(id);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        /* First, try reading the D-Bus machine id, unless it is a symlink */
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (fd >= 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                k = loop_read(fd, id, 32, false);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                close_nointr_nofail(fd);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (k >= 32) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        id[32] = '\n';
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        id[33] = 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        log_info("Initializing machine ID from D-Bus machine ID.");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        return 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        /* If that didn't work, see if we are running in qemu/kvm and a
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen         * machine ID was passed in via -uuid on the qemu/kvm command
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen         * line */
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        r = detect_vm(&vm_id);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (r > 0 && streq(vm_id, "kvm")) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                char uuid[37];
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (fd >= 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        k = loop_read(fd, uuid, 36, false);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        close_nointr_nofail(fd);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        if (k >= 36) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                r = shorten_uuid(id, uuid);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                if (r >= 0) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                                        log_info("Initializing machine ID from KVM UUID");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        return 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        /* If that didn't work either, see if we are running in a
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen         * container, and a machine ID was passed in via
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen         * $container_uuid the way libvirt/LXC does it */
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        r = detect_container(NULL);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (r > 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                FILE *f;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                f = fopen("/proc/1/environ", "re");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (f) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        bool done = false;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        do {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                char line[LINE_MAX];
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                unsigned i;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                for (i = 0; i < sizeof(line)-1; i++) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        int c;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                                        c = getc(f);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        if (_unlikely_(c == EOF)) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                                done = true;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                                break;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        } else if (c == 0)
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                                                break;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        line[i] = c;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                line[i] = 0;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                if (startswith(line, "container_uuid=") &&
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                    strlen(line + 15) >= 36) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        r = shorten_uuid(id, line + 15);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                                        if (r >= 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                                log_info("Initializing machine ID from container UUID");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                                return 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                                }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        } while (!done);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        fclose(f);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        /* If that didn't work, generate a random machine id */
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        r = sd_id128_randomize(&buf);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        if (r < 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                log_error("Failed to open /dev/urandom: %s", strerror(-r));
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                return r;
c31b0f4fe27c68b46a051eb0b48a485c7bc3a875slive        }
c31b0f4fe27c68b46a051eb0b48a485c7bc3a875slive
c31b0f4fe27c68b46a051eb0b48a485c7bc3a875slive        for (p = buf.bytes, q = id; p < buf.bytes + sizeof(buf); p++, q += 2) {
c31b0f4fe27c68b46a051eb0b48a485c7bc3a875slive                q[0] = hexchar(*p >> 4);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                q[1] = hexchar(*p & 15);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        id[32] = '\n';
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        id[33] = 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        log_info("Initializing machine ID from random generator.");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        return 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen}
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowenint machine_id_setup(void) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        int fd, r;
393f9c667e58b8cd6083ce03d5e03cc9f7b0dfaabnicholes        bool writable;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        struct stat st;
393f9c667e58b8cd6083ce03d5e03cc9f7b0dfaabnicholes        char id[34]; /* 32 + \n + \0 */
393f9c667e58b8cd6083ce03d5e03cc9f7b0dfaabnicholes        mode_t m;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        m = umask(0000);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        /* We create this 0444, to indicate that this isn't really
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen         * something you should ever modify. Of course, since the file
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive         * will be owned by root it doesn't matter much, but maybe
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive         * people look. */
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (fd >= 0)
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                writable = true;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        else {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (fd < 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        umask(m);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        log_error("Cannot open /etc/machine-id: %m");
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        return -errno;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                writable = false;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        umask(m);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (fstat(fd, &st) < 0) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                log_error("fstat() failed: %m");
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                r = -errno;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                goto finish;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        if (S_ISREG(st.st_mode)) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                if (loop_read(fd, id, 32, false) >= 32) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        r = 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                        goto finish;
6ec3b97fc9c9f163cfaae67fc448eea3f887f34dslive                }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        /* Hmm, so, the id currently stored is not useful, then let's
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive         * generate one */
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        r = generate(id);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        if (r < 0)
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                goto finish;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        if (S_ISREG(st.st_mode) && writable) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                lseek(fd, 0, SEEK_SET);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                if (loop_write(fd, id, 33, false) == 33) {
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        r = 0;
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                        goto finish;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        }
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        close_nointr_nofail(fd);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        fd = -1;
3a9b96be347a9900a5ed381d2d7dba0129685b38yoshiki
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        /* Hmm, we couldn't write it? So let's write it to
3a9b96be347a9900a5ed381d2d7dba0129685b38yoshiki         * /run/machine-id as a replacement */
3a9b96be347a9900a5ed381d2d7dba0129685b38yoshiki
3a9b96be347a9900a5ed381d2d7dba0129685b38yoshiki        m = umask(0022);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        r = write_one_line_file("/run/machine-id", id);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        umask(m);
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (r < 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                log_error("Cannot write /run/machine-id: %s", strerror(-r));
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                unlink("/run/machine-id");
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                goto finish;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        }
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        /* And now, let's mount it over */
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        r = mount("/run/machine-id", "/etc/machine-id", "bind", MS_BIND|MS_RDONLY, NULL) < 0 ? -errno : 0;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        if (r < 0) {
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                unlink("/run/machine-id");
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen                log_error("Failed to mount /etc/machine-id: %s", strerror(-r));
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        } else
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                log_info("Installed transient /etc/machine-id file.");
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
519e249ff843c8805d5ce2fdc299caacf7ad9e43slivefinish:
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive        if (fd >= 0)
519e249ff843c8805d5ce2fdc299caacf7ad9e43slive                close_nointr_nofail(fd);
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen        return r;
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen}
57d0156f7bbd9ea3a72342cf9912aba61d118702rbowen