When using unknown command line options with the GDM daemon, the
program hangs until explicitly getting killed.
This commit addresses that bug by dropping an unnecessary call to
g_option_context_set_ignore_unknown_options, so GOptionContext will
now give an error when encountering unknown options.
daemon/gdm-manager.c: quit plymouth when xdmcp is the only allowed connection.
gdm is responsible to kill plymouth by spawning the "plymouth quit"
subprocesses in gdm-manager.c. The current code pathes of quiting
plymouth can never be reached when xdmcp is the only connection
allowed. Consequently in the case of
!show_local_greeter && xdmcp_enabled
the plymouth-quit-wait.service will never quit and the login prompt
will not popup without manual interference. This issue could be
more obviously observed when a downstream like openSUSE which
allows a customized sysconfig to switch the corresponding two
options on a headless server (s390), where the setup is usually:
