Modular, context-aware and aspect-oriented dendritic Nix configurations.
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den.oeiuwq.com
configurations
den
dendritic
nix
aspect
oriented
example feature detection between hosts
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templates/ci/modules/features/resolve-adapters.nix
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templates/ci/modules/features/resolve-adapters.nix
···
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}
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);
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test-host-conditional-aspect-inclusion = denTest (
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{
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den,
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lib,
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iceberg,
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...
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}:
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{
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den.hosts.x86_64-linux.igloo = { };
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den.hosts.x86_64-linux.iceberg = { };
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den.aspects.foo.meta.key = "foo";
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den.aspects.foo.nixos.environment.sessionVariables.message = "foo";
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den.aspects.bar.nixos.environment.sessionVariables.message = "bar";
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# host igloo includes foo
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den.aspects.igloo.includes = [ den.aspects.foo ];
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# host iceberg feature detects if foo is available at host igloo
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den.aspects.iceberg.includes =
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let
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inherit (den.lib.aspects) resolve;
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inherit (den.hosts.x86_64-linux) igloo;
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iglooAspect = den.ctx.host { host = igloo; };
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detectFoo = resolve.withAdapter (hasAspectWithKey "foo") "nixos" iglooAspect;
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hasAspectWithKey =
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key:
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{ aspect, recurse, ... }:
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{
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found =
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aspect.meta.key or null == key || lib.any (i: (recurse i).found or false) (aspect.includes or [ ]);
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};
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in
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lib.optional detectFoo.found den.aspects.bar;
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expr = iceberg.environment.sessionVariables.message;
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expected = "bar";
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}
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);
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};
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}