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authorLennart Poettering <lennart@poettering.net>2012-02-15 19:16:08 +0100
committerLennart Poettering <lennart@poettering.net>2012-02-15 19:16:08 +0100
commitd4eb120a23e6a19a2886b517b64d5f260c5a4a21 (patch)
tree3916a70f8e90b77ca219cbd76198dd3f85620853 /src
parent437b7dee328738b7aca89a9c7527f228ff8f2d34 (diff)
machine-id: initialize vom qemu/kvm -uuid parameter if available
Diffstat (limited to 'src')
-rw-r--r--src/machine-id-setup.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/src/machine-id-setup.c b/src/machine-id-setup.c
index 531f3b2073..d584181bed 100644
--- a/src/machine-id-setup.c
+++ b/src/machine-id-setup.c
@@ -33,6 +33,7 @@
#include "macro.h"
#include "util.h"
#include "log.h"
+#include "virt.h"
static int generate(char id[34]) {
int fd, r;
@@ -40,6 +41,7 @@ static int generate(char id[34]) {
sd_id128_t buf;
char *q;
ssize_t k;
+ const char *vm_id;
assert(id);
@@ -47,7 +49,7 @@ static int generate(char id[34]) {
fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd >= 0) {
- k = loop_read(fd, id, 33, false);
+ k = loop_read(fd, id, 32, false);
close_nointr_nofail(fd);
if (k >= 32) {
@@ -59,6 +61,43 @@ static int generate(char id[34]) {
}
}
+ /* If that didn't work, 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);
+ close_nointr_nofail(fd);
+
+ if (k >= 36) {
+ unsigned i, j;
+
+ for (i = 0, j = 0; i < 36 && j < 32; i++) {
+ int t;
+
+ t = unhexchar(uuid[i]);
+ if (t < 0)
+ continue;
+
+ id[j++] = hexchar(t);
+ }
+
+ if (i == 36 && j == 32) {
+ id[32] = '\n';
+ id[33] = 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) {