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authorLennart Poettering <lennart@poettering.net>2014-08-20 13:49:39 +0200
committerLennart Poettering <lennart@poettering.net>2014-08-20 13:51:17 +0200
commit5dd6d0f8ff1681fff9369e0aa2532979954dbfde (patch)
tree9579b85b9bca4d0273f9049ff7075bd053406adf /src/core
parent413f6df864083130a380b2f7adbb5aa970139fe7 (diff)
machine-id-setup: don't try to read UUID from VM/container manager if we operate on a root directory that's not /
This should make sure no UUID from the host systemd-machine-id-setup is running on leaks onto a disk image that is provisioned with the tool.
Diffstat (limited to 'src/core')
-rw-r--r--src/core/machine-id-setup.c79
1 files changed, 41 insertions, 38 deletions
diff --git a/src/core/machine-id-setup.c b/src/core/machine-id-setup.c
index 712f60cb11..efb074fcbd 100644
--- a/src/core/machine-id-setup.c
+++ b/src/core/machine-id-setup.c
@@ -64,15 +64,16 @@ static int generate(char id[34], const char *root) {
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);
@@ -93,46 +94,48 @@ static int generate(char id[34], const char *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) {
- _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 */
+ _cleanup_free_ char *e = NULL;
- 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);
+ 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;
+ }
+ }
+ }
+ }
}
}