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flake-utils
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eachSystem: push down `system` as far down as possible for Hydra jobs (#46)

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Maximilian Bosch 2021-11-28 18:59:42 +01:00 committed by GitHub
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commit 74f7e43192
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1 changed files with 36 additions and 6 deletions
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42
default.nix
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@ -66,16 +66,46 @@ let
#
eachSystem = systems: f:
let
# Taken from <nixpkgs/lib/attrsets.nix>
isDerivation = x: builtins.isAttrs x && x ? type && x.type == "derivation";
# Used to match Hydra's convention of how to define jobs. Basically transforms
#
# hydraJobs = {
# hello = <derivation>;
# haskellPackages.aeson = <derivation>;
# }
#
# to
#
# hydraJobs = {
# hello.x86_64-linux = <derivation>;
# haskellPackages.aeson.x86_64-linux = <derivation>;
# }
#
# if the given flake does `eachSystem [ "x86_64-linux" ] { ... }`.
pushDownSystem = system: merged:
builtins.mapAttrs
(name: value:
if ! (builtins.isAttrs value) then value
else if isDerivation value then (merged.${name} or {}) // { ${system} = value; }
else pushDownSystem system (merged.${name} or {}) value);
# Merge together the outputs for all systems.
op = attrs: system:
let
ret = f system;
op = attrs: key:
attrs //
{
${key} = (attrs.${key} or { }) // (if key == "hydraJobs"
then builtins.mapAttrs (name: value: (attrs.hydraJobs.${name} or { }) // { ${system} = value; }) ret.hydraJobs
else { ${system} = ret.${key}; });
}
let
appendSystem = key: system: ret:
if key == "hydraJobs"
then (pushDownSystem system (attrs.hydraJobs or {}) ret.hydraJobs)
else { ${system} = ret.${key}; };
in attrs //
{
${key} = (attrs.${key} or { })
// (appendSystem key system ret);
}
;
in
builtins.foldl' op attrs (builtins.attrNames ret);