[ostree] tests: skip test-commit-sign.sh when not root

[Giuseppe Scrivano <gscrivano src gnome org>]

commit d3545b0661f3247cd8c106e64a71052ce9952243
Author: Giuseppe Scrivano <gscrivan redhat com>
Date:   Thu Apr 2 14:21:52 2015 +0200

    tests: skip test-commit-sign.sh when not root
    
    Signed-off-by: Giuseppe Scrivano <gscrivan redhat com>

 tests/test-commit-sign.sh |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/tests/test-commit-sign.sh b/tests/test-commit-sign.sh
index 7848324..01a3a2e 100755
--- a/tests/test-commit-sign.sh
+++ b/tests/test-commit-sign.sh
@@ -23,6 +23,12 @@ if ! ${CMD_PREFIX} ostree --version | grep -q -e '\+gpgme'; then
     exit 77
 fi
 
+# Skip the test when non-root as gpgme would not read files owned by
+# another user.
+if test "$(id -i)" != "0"; then
+    exit 77
+fi
+
 . $(dirname $0)/libtest.sh
 
 keyid="472CDAFA"