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I recently came across this rather nice way of structuring build matrices for ci.nix. I think it makes the haskell.nix ci.nix a lot clearer!
115 lines
2.9 KiB
Nix
115 lines
2.9 KiB
Nix
# Borrowed from https://github.com/cachix/ghcide-nix/pull/4/files#diff-70bfff902f4dec33e545cac10ee5844d
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# Tweaked to use builtins.mapAttrs instead of needing the one from nixpkgs lib
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{
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/*
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dimension: name -> attrs -> function -> attrs
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where
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function: keyText -> value -> attrsOf package
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WARNING: Attribute names must not contain periods (".").
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See https://github.com/NixOS/nix/issues/3088
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NOTE: The dimension name will be picked up by agent and web ui soon.
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Specifies a dimension of the build matrix. For example
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dimension "Example" {
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withP = { p = true; }
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withoutP = { p = false; }
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} (key: # either "withP" or "withoutP"
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{ p }: # either p = true or p = false
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myProject p
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)
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evaluates roughly to
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{
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withP = myProject true;
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withoutP = myProject false;
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}
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Use nested calls for multiple dimensions.
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Example:
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dimension "System" {
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"x86_64-linux" = {};
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# ...
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}: (system: {}:
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dimension "Nixpkgs release" (
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{
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"nixpkgs-19_03".nixpkgs = someSource
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} // optionalAttrs (system != "...") {
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"nixpkgs-unstable".nixpkgs = someOtherSource
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}
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) (_key: { nixpkgs }:
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myProject system nixpkgs
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)
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)
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evaluates roughly to
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{
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x86_64-linux.nixpkgs-19_03 = myProject "x86_64-linux" someSource;
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x86_64-linux.nixpkgs-unstable = myProject "x86_64-linux" someOtherSource;
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...
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}
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If you need to make references across attributes, you can do so by binding
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the result. Wherever you write
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dimension "My dimension" {} (key: value: f1 key value)
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You can also write
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let
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myDimension = dimension "My dimension" {} (key: value: f2 key value myDimension)
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in
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myDimension
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This example builds a single test runner to reuse across releases:
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let
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overlay =
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testRunnerPkgs: self: super: {
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# ...
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};
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myProject =
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{ nixpkgs,
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pkgs ? import nixpkgs { overlays = [ overlay ]; },
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testRunnerPkgs ? pkgs
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}: pkgs;
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in
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let
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latest = "nixpkgs-19_03";
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releases =
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dimension "Nixpkgs release"
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{
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nixpkgs-18_09.nixpkgs = someSource
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nixpkgs-19_03.nixpkgs = someOtherSource
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}
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(_key: { nixpkgs }:
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myProject {
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inherit nixpkgs;
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testRunnerPkgs = releases."${latest}";
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}
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);
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in releases;
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*/
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dimension = name: attrs: f:
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builtins.mapAttrs
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(k: v:
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let o = f k v;
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in o // { recurseForDerivations = o.recurseForDerivations or true; }
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)
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attrs
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// { meta.dimension.name = name; };
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}
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