colin
121936620a
this is useful for when we need to store files to disk purely due to their size, but don't actually want them to be persisted.
17 lines
821 B
Nix
17 lines
821 B
Nix
{ ... }:
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{
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# /etc/machine-id is a globally unique identifier used for:
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# - systemd-networkd: DHCP lease renewal (instead of keying by the MAC address)
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# - systemd-journald: to filter logs by host
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# - chromium (potentially to track re-installations)
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# - gdbus; system services that might upgrade to AF_LOCAL if both services can confirm they're on the same machine
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# because of e.g. the chromium use, we *don't want* to persist this.
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# however, `journalctl` won't show logs from previous boots unless the machine-ids match.
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# so for now, generate something unique from the host ssh key.
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# TODO: move this into modules?
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system.activationScripts.machine-id = {
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deps = [ "persist-ssh-host-keys" ];
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text = "sha256sum /etc/ssh/host_keys/ssh_host_ed25519_key | cut -c 1-32 > /etc/machine-id";
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};
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}
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