[systemd-devel] How to add a unit path to systemd?

[Filipe Brandenburger]

On Thu, Aug 9, 2018 at 10:21 AM Daniel Wang <wonderfly at google.com> wrote:
> I want to append to systemd's unit search path a directory on my OEM partition, which is mounted  by a .mount unit, at /usr/share/. I will be putting unit files in that partition, some of which I want to run before default.target. Is it possible to do so without a systemctl daemon-reload?
>
> I understand I could configure systemd at compile time, or use the SYSTEMD_UNIT_PATH env var at the kernel command line, but since /usr/share/ is probably mounted _after_ default.target is first referenced (?), they won't do what I need?

All the unit files need to be available at early boot, so if they're
coming from a separate partition, the partition needs to be mounted
before systemd starts (i.e. from the initramfs.)

See here for more details:
https://github.com/systemd/systemd/issues/8307#issuecomment-369298082

Cheers,
Filipe
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