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/* Nix expression to test for regressions in the Haskell configuration overlays.
test-configurations.nix determines all attributes touched by given Haskell
configuration overlays (i. e. pkgs/development/haskell-modules/configuration-*.nix)
and builds all derivations (or at least a reasonable subset) affected by
these overrides.
By default, it checks `configuration-{common,nix,ghc-8.10.x}.nix`. You can
invoke it like this:
nix-build maintainers/scripts/haskell/test-configurations.nix --keep-going
It is possible to specify other configurations:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--arg files '[ "configuration-ghc-9.0.x.nix" "configuration-ghc-9.2.x.nix" ]' \
--keep-going
You can also just supply a single string:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--argstr files "configuration-arm.nix" --keep-going
You can even supply full paths which is handy, as it allows for tab-completing
the configurations:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--argstr files pkgs/development/haskell-modules/configuration-arm.nix \
--keep-going
By default, derivation that fail to evaluate are skipped, unless they are
“just” marked as broken. You can check for other eval errors like this:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--arg skipEvalErrors false --keep-going
You can also disable checking broken packages by passing a nixpkgs config:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--arg config '{ allowBroken = false; }' --keep-going
By default the haskell.packages.ghc*Binary sets used for bootstrapping GHC
are _not_ tested. You can change this using:
nix-build maintainers/scripts/haskell/test-configurations.nix \
--arg skipBinaryGHCs false --keep-going
*/
{ files ? [
"configuration-common.nix"
"configuration-nix.nix"
"configuration-ghc-8.10.x.nix"
]
, nixpkgsPath ? ../../..
, config ? { allowBroken = true; }
, skipEvalErrors ? true
, skipBinaryGHCs ? true
}:
let
pkgs = import nixpkgsPath { inherit config; };
inherit (pkgs) lib;
# see usage explanation for the input format `files` allows
files' = builtins.map builtins.baseNameOf (
if !builtins.isList files then [ files ] else files
);
packageSetsWithVersionedHead = pkgs.haskell.packages // (
let
headSet = pkgs.haskell.packages.ghcHEAD;
# Determine the next GHC release version following GHC HEAD.
# GHC HEAD always has an uneven, tentative version number, e.g. 9.7.
# GHC releases always have even numbers, i.e. GHC 9.8 is branched off from
# GHC HEAD 9.7. Since we use the to be release number for GHC HEAD's
# configuration file, we need to calculate this here.
headVersion = lib.pipe headSet.ghc.version [
lib.versions.splitVersion
(lib.take 2)
lib.concatStrings
lib.strings.toInt
(builtins.add 1)
toString
];
in
{
"ghc${headVersion}" = headSet;
}
);
setsForFile = fileName:
let
# extract the unique part of the config's file name
configName = builtins.head (
builtins.match "configuration-(.+).nix" fileName
);
# match the major and minor version of the GHC the config is intended for, if any
configVersion = lib.concatStrings (
builtins.match "ghc-([0-9]+).([0-9]+).x" configName
);
# return all package sets under haskell.packages matching the version components
setsForVersion = builtins.map (name: packageSetsWithVersionedHead.${name}) (
builtins.filter (setName:
lib.hasPrefix "ghc${configVersion}" setName
&& (skipBinaryGHCs -> !(lib.hasInfix "Binary" setName))
) (
builtins.attrNames packageSetsWithVersionedHead
)
);
defaultSets = [ pkgs.haskellPackages ];
in {
# use plain haskellPackages for the version-agnostic files
# TODO(@sternenseemann): also consider currently selected versioned sets
"common" = defaultSets;
"nix" = defaultSets;
"arm" = defaultSets;
"darwin" = defaultSets;
}.${configName} or setsForVersion;
# attribute set that has all the attributes of haskellPackages set to null
availableHaskellPackages = builtins.listToAttrs (
builtins.map (attr: lib.nameValuePair attr null) (
builtins.attrNames pkgs.haskellPackages
)
);
# evaluate a configuration and only return the attributes changed by it,
# pass availableHaskellPackages as super in case intersectAttrs is used
overriddenAttrs = fileName: builtins.attrNames (
lib.fix (self:
import (nixpkgsPath + "/pkgs/development/haskell-modules/${fileName}") {
haskellLib = pkgs.haskell.lib.compose;
inherit pkgs;
} self availableHaskellPackages
)
);
# list of derivations that are affected by overrides in the given configuration
# overlays. For common, nix, darwin etc. only the derivation from the default
# package set will be emitted.
packages = builtins.filter (v:
lib.warnIf (v.meta.broken or false) "${v.pname} is marked as broken" (
v != null
&& (skipEvalErrors -> (builtins.tryEval (v.outPath or v)).success)
)
) (
lib.concatMap (fileName:
let
sets = setsForFile fileName;
attrs = overriddenAttrs fileName;
in
lib.concatMap (set: builtins.map (attr: set.${attr}) attrs) sets
) files'
);
in
packages
|