[PATCH v2 0/3] useradd.bbclass: fix parse error when only USERADD_DEPENDS is set

["Zk47T" <zizuzacker@gmail.com>]

When a recipe inherits useradd and only sets USERADD_DEPENDS (to depend
on users/groups created by another recipe) without creating any
users/groups itself, the parse-time sanity check in
update_useradd_after_parse() unconditionally throws a fatal error about
missing USERADD_PACKAGES.

This series fixes the issue by skipping the USERADD_PACKAGES validation
when USERADD_DEPENDS is set, adds a selftest recipe to exercise this
code path, and adds an oe-selftest case to verify the build succeeds.

Changes in v2:
- Added oe-selftest test case in usergrouptests.py (patch 3/3)
  as suggested by Ross Burton

Fixes [YOCTO #15863]

Nguyen Minh Tien (3):
  useradd.bbclass: allow inheriting with only USERADD_DEPENDS set
  meta-selftest: add usegroup-deponly recipe to test USERADD_DEPENDS
    only
  oe-selftest: add test for useradd with only USERADD_DEPENDS

 .../selftest-users/usegroup-deponly.bb        | 25 +++++++++++++++++++
 meta/classes/useradd.bbclass                  |  5 ++++
 .../lib/oeqa/selftest/cases/usergrouptests.py |  6 +++++
 3 files changed, 36 insertions(+)
 create mode 100644 meta-selftest/recipes-test/selftest-users/usegroup-deponly.bb

-- 
2.34.1