oci: Update docs for oci.WithUserID

Ian Campbell · estesp · commit 4d629f325340 · 2018-08-20T09:18:34.000-04:00
The behaviour was changed in 99df1a9 ("Set gid 0 when no group is specified"), part of #2529. Take the opportunity to tighten up the grammar a bit too. Signed-off-by: Ian Campbell <ian.campbell@docker.com> Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
diff --git a/oci/spec_opts_unix.go b/oci/spec_opts_unix.go
@@ -348,8 +348,8 @@ func WithUIDGID(uid, gid uint32) SpecOpts {
 
 // WithUserID sets the correct UID and GID for the container based
 // on the image's /etc/passwd contents. If /etc/passwd does not exist,
-// or uid is not found in /etc/passwd, it sets gid to be the same with
-// uid, and not returns error.
+// or uid is not found in /etc/passwd, it sets the requested uid,
+// additionally sets the gid to 0, and does not return an error.
 func WithUserID(uid uint32) SpecOpts {
 	return func(ctx context.Context, client Client, c *containers.Container, s *specs.Spec) (err error) {
 		setProcess(s)
