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Code

machine-id: initialize vom qemu/kvm -uuid parameter if available

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This commit is contained in:
Lennart Poettering 2012-02-15 19:16:08 +01:00
parent 437b7dee32
commit d4eb120a23
1 changed files with 40 additions and 1 deletions
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41
src/machine-id-setup.c
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@ -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) {