64 lines
1.6 KiB
Nix
64 lines
1.6 KiB
Nix
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# Vendored from https://raw.githubusercontent.com/NixOS/infra/master/lib/service-order.nix
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# TODO: get rid of me?
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# Ordering Services
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#
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# Given a set of services, make them run one at a time in a specific
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# order, on a timer.
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{ lib }:
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{
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# Given a list of systemd service, give each one an After
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# attribute, so they start in a specific order. The returned
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# list can be converted in to a systemd.services attrset with
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# `lib.listToAttrs`.
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#
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# Example:
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#
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# mkOrderedChain [
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# { name = "foo"; value = { script = "true"; }; }
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# { name = "bar"; value = { script = "true"; }; }
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# ]
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#
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# => [
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# {
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# name = "foo";
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# value = {
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# script = "true";
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# unitConfig = { After = []; };
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# };
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# }
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# {
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# name = "bar";
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# value = {
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# script = "true";
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# unitConfig = { After = [ "bar" ]; };
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# };
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# }
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#
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mkOrderedChain = jobs: let
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unitConfigFrom = job: job.unitConfig or {};
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afterFrom = job: (unitConfigFrom job).After or [];
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previousFrom = collector:
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if collector ? previous
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then [collector.previous]
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else [];
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ordered = builtins.foldl'
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(collector: item: {
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services = collector.services
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++ [{
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inherit (item) name;
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value = item.value // {
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unitConfig = (unitConfigFrom item.value) //
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{
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After = (afterFrom item.value) ++
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(previousFrom collector);
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};
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};
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}];
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previous = "${item.name}.service";
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})
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{ services = []; }
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jobs;
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in ordered.services;
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}
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