172e9cc3ee
We would resolve those specifiers to the calling user/group. This is mostly OK when done in the manager, because the manager generally operates as root in system mode, and a non-root in user mode. It would still be wrong if called with --test though. But in systemctl, this would be generally wrong, since we can call 'systemctl --system' as a normal user, either for testing or even for actual operation with '--root=…'. When operating in --global mode, %u/%U/%g/%G should return an error. The information whether we're operating in system mode, user mode, or global mode is passed as the data pointer to specifier_group_name(), specifier_user_name(), specifier_group_id(), specifier_user_id(). We can't use userdata, because it's already used for other things.
System and Service Manager
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