f63c842f1e
The original idea for this test was, on top of providing a networkd test, to provide newcomers with a sample configuration they could use to get started with networkd. That's precisely why we were doing this systemd tmpfile dance in the first place. It was a convenient way to create a runtime file with a specific mode and owner. Sadly, this tmpfile rule made the test flaky. There's a race condition between the wireguard interface configured by systemd-networkd and systemd-tmpfiles-setup. Sometimes, networkd is going to try loading the wireguard private key file *before* the said file gets created by systemd-tmpfiles. A perfect solution here would be to create a "After" dependency between wg0.netdev and systemd-tmpfiles-setup.service. Sadly, it is currently impossible to create such a dependency between a networkd-specific unit and a service. We're removing this tmp file in favor of pointing networkd directly to the Nix store. This is clearly something that shouldn't be done in the real world for a private file: the store is world-readable. However, this is the only way I found to fix this test flakiness for now.
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