cooker, seitan: Add support for GID/UID in context

Similarly to namespace specifications, the special value "caller", as
well as login/group names and numeric UID/GIDs are supported.

Example of usage in demo/mknod.hjson. Light on checks and with some
TODOs left behind at the moment.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/demo/mknod.hjson b/demo/mknod.hjson
index 9124a8a..1936eb8 100644
--- a/demo/mknod.hjson
+++ b/demo/mknod.hjson
@@ -26,7 +26,7 @@
           "major": 1,
           "minor": { "tag": { "get": "minor" } }
         },
-        "context": { "mnt": "caller" }
+        "context": { "mnt": "caller", "uid": "caller", "gid": "caller" }
       },
     "return": { "value": 0, "error": 0 }
   }