I want a service before systemd runs fstab and generates *.mount files to use, and some services that autostart on bootup that require that specific service to complete. Is there a way to have systemd wait for that service to finish before running a new service?
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You could have a service B require a service A (e.g. by putting RequiredBy=serviceB.service in the [Install] section of service A), where service A is a Type=oneshot service.
In this case systemd will wait for the main process of service A (specified by ExecStart= in service A unit file) to complete before it starts service B.
(Not sure though if I understand correctly the first part of your question. Maybe this isn't what you were asking)
