systemd: Correct and clean up user/group definitions
This makes sure that packages are only added to USERADD_PACKAGES if
they will create users/groups. This avoids the following error:
ERROR: systemd_239.bb: meta/recipes-core/systemd/systemd_239.bb
inherits useradd but doesn't set USERADD_PARAM, GROUPADD_PARAM or
GROUPMEMS_PARAM for package systemd-journal-gateway
Normally this problem is not triggered even if the conditional code that
expands in, e.g., USERADD_PARAM_${PN}-journal-gateway is empty because
it is assigned with += and thus ends up as " ", which fools the check in
useradd.bbclass.
However, if USERADDEXTENSION += "useradd-staticids" and
INHERIT += "extrausers" are used, they cause the problem to occur. The
reason for this is because when useradd-staticids is used, it rewrites
USERADD_PARAM_${PN}-journal-gateway, which strips unnecessary whitespace
and thus USERADD_PARAM_${PN}-journal-gateway becomes empty. And
extrausers is needed, because otherwise the test in useradd.bbclass is
triggered before useradd-staticids has rewritten the variables...
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
