Add test for "are we running as root".

Most operations require root access.  Rather than ensure we generate
the right error message when something fails because we aren't root,
check early.
Note that "--examine" does not necessarily require root, so test
for that first.

Resolves-Debian-bug: 396570
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/mdadm.c b/mdadm.c
index be4fbf6dc29519b726a22adf8a733e7a818aae1c..eb124d53dcfd4c99f1539412fb638b946fe42eea 100644 (file)
--- a/mdadm.c
+++ b/mdadm.c
@@ -1046,6 +1046,12 @@ int main(int argc, char *argv[])
                }
        }
 
+       if ((mode != MISC || devmode != 'E') &&
+           geteuid() != 0) {
+               fprintf(stderr, Name ": must be super-user to perform this action\n");
+               exit(1);
+       }
+
        ident.autof = autof;
 
        rv = 0;