#include <fcntl.h>
#include <sys/mount.h>
-#include <systemd/sd-id128.h>
+#include "systemd/sd-id128.h"
#include "machine-id-setup.h"
#include "macro.h"
int fd, r;
unsigned char *p;
sd_id128_t buf;
- char *q;
+ char *q;
ssize_t k;
- const char *vm_id;
- _cleanup_free_ char *dbus_machine_id = NULL;
+ const char *vm_id, *dbus_machine_id;
assert(id);
- if (asprintf(&dbus_machine_id, "%s/var/lib/dbus/machine-id", root) < 0)
- return log_oom();
+ if (isempty(root))
+ dbus_machine_id = "/var/lib/dbus/machine-id";
+ else
+ dbus_machine_id = strappenda(root, "/var/lib/dbus/machine-id");
/* First, try reading the D-Bus machine id, unless it is a symlink */
fd = open(dbus_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
}
}
- /* 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 */
- r = detect_container(NULL);
- if (r > 0) {
- _cleanup_free_ char *e = NULL;
-
- r = getenv_for_pid(1, "container_uuid", &e);
+ 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 */
+ r = detect_container(NULL);
if (r > 0) {
- if (strlen(e) >= 36) {
- r = shorten_uuid(id, e);
- if (r >= 0) {
- log_info("Initializing machine ID from container UUID.");
- return 0;
- }
- }
- }
-
- } else {
- /* 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 */
-
- r = detect_vm(&vm_id);
- if (r > 0 && streq(vm_id, "kvm")) {
- char uuid[37];
-
- fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fd >= 0) {
- k = loop_read(fd, uuid, 36, false);
- safe_close(fd);
+ _cleanup_free_ char *e = NULL;
- if (k >= 36) {
- r = shorten_uuid(id, uuid);
+ r = getenv_for_pid(1, "container_uuid", &e);
+ if (r > 0) {
+ if (strlen(e) >= 36) {
+ r = shorten_uuid(id, e);
if (r >= 0) {
- log_info("Initializing machine ID from KVM UUID.");
+ log_info("Initializing machine ID from container UUID.");
return 0;
}
}
}
+
+ } else {
+ /* 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 */
+
+ r = detect_vm(&vm_id);
+ if (r > 0 && streq(vm_id, "kvm")) {
+ char uuid[37];
+
+ fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd >= 0) {
+ k = loop_read(fd, uuid, 36, false);
+ safe_close(fd);
+
+ if (k >= 36) {
+ r = shorten_uuid(id, uuid);
+ if (r >= 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(&buf);
- if (r < 0) {
- log_error("Failed to open /dev/urandom: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to open /dev/urandom: %m");
for (p = buf.bytes, q = id; p < buf.bytes + sizeof(buf); p++, q += 2) {
q[0] = hexchar(*p >> 4);
int machine_id_setup(const char *root) {
const char *etc_machine_id, *run_machine_id;
_cleanup_close_ int fd = -1;
- bool writable = false;
+ bool writable = true;
struct stat st;
char id[34]; /* 32 + \n + \0 */
int r;
mkdir_parents(etc_machine_id, 0755);
fd = open(etc_machine_id, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
- if (fd >= 0)
- writable = true;
- else {
+ if (fd < 0) {
+ int old_errno = errno;
+
fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fd < 0) {
- log_error("Cannot open %s: %m", etc_machine_id);
+ if (old_errno == EROFS && errno == ENOENT)
+ log_error("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;
}
}
}
- if (fstat(fd, &st) < 0) {
- log_error("fstat() failed: %m");
- return -errno;
- }
+ if (fstat(fd, &st) < 0)
+ return log_error_errno(errno, "fstat() failed: %m");
if (S_ISREG(st.st_mode))
if (loop_read(fd, id, 33, false) == 33 && id[32] == '\n') {
r = write_string_file(run_machine_id, id);
}
if (r < 0) {
- log_error("Cannot write %s: %s", run_machine_id, strerror(-r));
+ log_error_errno(r, "Cannot write %s: %m", run_machine_id);
unlink(run_machine_id);
return r;
}
/* And now, let's mount it over */
r = mount(run_machine_id, etc_machine_id, NULL, MS_BIND, NULL);
if (r < 0) {
- log_error("Failed to mount %s: %m", etc_machine_id);
+ log_error_errno(errno, "Failed to mount %s: %m", etc_machine_id);
unlink_noerrno(run_machine_id);
return -errno;
}
/* Mark the mount read-only */
if (mount(NULL, etc_machine_id, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, NULL) < 0)
- log_warning("Failed to make transient %s read-only: %m", etc_machine_id);
+ log_warning_errno(errno, "Failed to make transient %s read-only: %m", etc_machine_id);
return 0;
}