[OE-core] [PATCH] useradd-staticids: don't create username-group if gid is specified

[André Draszik]

From: André Draszik <adraszik at tycoint.com>

Adding distcc to an image, and having staticids enabled,
doesn't work as it causes a a superfluous 'distcc' group
being added using a conflicting  GID, thus failing the
build:
 | ERROR: distcc-3.2-r0 do_prepare_recipe_sysroot: distcc: groupadd command did not succeed.

Compared to other recipes, the distcc recipe only
specifies --gid for the primary group, and doesn't specify
--no-user-group, but when --gid is given, it doesn't make
sense to create a matching username-group in addition,
even if --no-user-group was not specified, and 'useradd'
actually complains if --gid and --user-group are given
both.

If only --gid is given, the current code in here
effectively behaves as if --user-group was specified,
taking the group-id of the username-group from the
--gid parameter. This causes the error above, as we try
to add a new group (distcc) with an existing group-id
(nogroup).

This is contrary to the comment in this file just above,
contrary to what useradd can do, contrary to behaviour
without the useradd-staticids bbclass, and non-intuitive.

Change the code such that a username-group is only created
if actually requested, of if a primary group using --gid
was *not* specified.

Signed-off-by: André Draszik <adraszik at tycoint.com>
---
 meta/classes/useradd-staticids.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/useradd-staticids.bbclass b/meta/classes/useradd-staticids.bbclass
index ce4ac62ab5..1b61a8bf9b 100644
--- a/meta/classes/useradd-staticids.bbclass
+++ b/meta/classes/useradd-staticids.bbclass
@@ -102,7 +102,7 @@ def update_useradd_static_config(d):
             # So if the implicit username-group creation is on, then the implicit groupname (LOGIN)
             # is used, and we disable the user_group option.
             #
-            user_group = uaargs.user_group is None or uaargs.user_group is True
+            user_group = uaargs.gid is None or uaargs.user_group is True
             uaargs.groupname = uaargs.LOGIN if user_group else uaargs.gid
             uaargs.groupid = field[3] or uaargs.gid or uaargs.groupname
 
-- 
2.14.1