commit 3065777ece6d14c6acd04f8b2b693a15c9f2f37c
author Christian Franke <nobody@nowhere.ws> Wed May 13 13:59:17 2015 +0200
committer David Lamparter <equinox@opensourcerouting.org> Wed May 27 20:39:04 2015 +0200
tree 5e8d9c5880ea7540a3e4dd6a7228b45330e5a0e8
parent 19ed526eab33728723e25f2727f60f41d3533503

lib/privs: display more info if cap_set_proc fails.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

lib/privs.c

diff --git a/lib/privs.c b/lib/privs.c
index f7269f4..3355f24 100644
--- a/lib/privs.c
+++ b/lib/privs.c
@@ -299,7 +299,21 @@
    */
   if ( cap_set_proc (zprivs_state.caps) ) 
     {
-      fprintf (stderr, "privs_init: initial cap_set_proc failed\n");
+      cap_t current_caps;
+      char *current_caps_text = NULL;
+      char *wanted_caps_text = NULL;
+
+      fprintf(stderr, "privs_init: initial cap_set_proc failed: %s\n",
+              safe_strerror(errno));
+
+      current_caps = cap_get_proc();
+      if (current_caps)
+          current_caps_text = cap_to_text(current_caps, NULL);
+
+      wanted_caps_text = cap_to_text(zprivs_state.caps, NULL);
+      fprintf(stderr, "Wanted caps: %s\n", wanted_caps_text ? wanted_caps_text : "???");
+      fprintf(stderr, "Have   caps: %s\n", current_caps_text ? current_caps_text : "???");
+
       exit (1);
     }