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authorLennart Poettering <lennart@poettering.net>2012-03-14 14:06:42 +0100
committerLennart Poettering <lennart@poettering.net>2012-03-14 14:06:42 +0100
commit09b967eaa51a39dabb7f238927f67bd682466dbc (patch)
tree96fef6956a89eb27703c84270a4100fbc3f6bfba /src/machine-id-setup.c
parent2d44fc7ba5aaf700672baa7b0697caefddafdc53 (diff)
machine-id: initialize from $container_uuid if not set otherwise
This is a result of the discussions on https://bugs.freedesktop.org/show_bug.cgi?id=46894
Diffstat (limited to 'src/machine-id-setup.c')
-rw-r--r--src/machine-id-setup.c81
1 files changed, 67 insertions, 14 deletions
diff --git a/src/machine-id-setup.c b/src/machine-id-setup.c
index d584181bed..0f97433804 100644
--- a/src/machine-id-setup.c
+++ b/src/machine-id-setup.c
@@ -35,6 +35,28 @@
#include "log.h"
#include "virt.h"
+static int shorten_uuid(char destination[36], const char *source) {
+ unsigned i, j;
+
+ for (i = 0, j = 0; i < 36 && j < 32; i++) {
+ int t;
+
+ t = unhexchar(source[i]);
+ if (t < 0)
+ continue;
+
+ destination[j++] = hexchar(t);
+ }
+
+ if (i == 36 && j == 32) {
+ destination[32] = '\n';
+ destination[33] = 0;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
static int generate(char id[34]) {
int fd, r;
unsigned char *p;
@@ -75,26 +97,57 @@ static int generate(char id[34]) {
close_nointr_nofail(fd);
if (k >= 36) {
- unsigned i, j;
+ r = shorten_uuid(id, uuid);
+ if (r >= 0) {
+ log_info("Initializing machine ID from KVM UUID");
+ return 0;
+ }
+ }
+ }
+ }
- for (i = 0, j = 0; i < 36 && j < 32; i++) {
- int t;
+ /* If that didn't work either, see if we are running in a
+ * container, and a machine ID was passed in via
+ * $container_uuid the way libvirt/LXC does it */
- t = unhexchar(uuid[i]);
- if (t < 0)
- continue;
+ r = detect_container(NULL);
+ if (r > 0) {
+ FILE *f;
- id[j++] = hexchar(t);
- }
+ f = fopen("/proc/1/environ", "re");
+ if (f) {
+ bool done = false;
- if (i == 36 && j == 32) {
- id[32] = '\n';
- id[33] = 0;
+ do {
+ char line[LINE_MAX];
+ unsigned i;
- log_info("Initializing machine ID from KVM UUID");
- return 0;
+ for (i = 0; i < sizeof(line)-1; i++) {
+ int c;
+
+ c = getc(f);
+ if (_unlikely_(c == EOF)) {
+ done = true;
+ break;
+ } else if (c == 0)
+ break;
+
+ line[i] = c;
}
- }
+ line[i] = 0;
+
+ if (startswith(line, "container_uuid=") &&
+ strlen(line + 15) >= 36) {
+ r = shorten_uuid(id, line + 15);
+ if (r >= 0) {
+ log_info("Initializing machine ID from container UUID");
+ return 0;
+ }
+ }
+
+ } while (!done);
+
+ fclose(f);
}
}