core: add "invocation ID" concept to service manager

[elogind.git] / src / libelogind / sd-id128 / sd-id128.c

diff --git a/src/libelogind/sd-id128/sd-id128.c b/src/libelogind/sd-id128/sd-id128.c
index 1470e4c01a7f9c71d365c115d141f084b6a3fdb0..d4450c70a003c357b0dafce92a542e2f67f87459 100644 (file)
--- a/src/libelogind/sd-id128/sd-id128.c
+++ b/src/libelogind/sd-id128/sd-id128.c
@@ -52,7 +52,6 @@ _public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
         bool is_guid = false;
 
         assert_return(s, -EINVAL);
-        assert_return(ret, -EINVAL);
 
         for (n = 0, i = 0; n < 16;) {
                 int a, b;
@@ -90,7 +89,8 @@ _public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
         if (s[i] != 0)
                 return -EINVAL;
 
-        *ret = t;
+        if (ret)
+                *ret = t;
         return 0;
 }
 
@@ -129,6 +129,28 @@ _public_ int sd_id128_get_boot(sd_id128_t *ret) {
         return 0;
 }
 
+_public_ int sd_id128_get_invocation(sd_id128_t *ret) {
+        static thread_local sd_id128_t saved_invocation_id = {};
+        int r;
+
+        assert_return(ret, -EINVAL);
+
+        if (sd_id128_is_null(saved_invocation_id)) {
+                const char *e;
+
+                e = secure_getenv("INVOCATION_ID");
+                if (!e)
+                        return -ENXIO;
+
+                r = sd_id128_from_string(e, &saved_invocation_id);
+                if (r < 0)
+                        return r;
+        }
+
+        *ret = saved_invocation_id;
+        return 0;
+}
+
 static sd_id128_t make_v4_uuid(sd_id128_t id) {
         /* Stolen from generate_random_uuid() of drivers/char/random.c
          * in the kernel sources */