Try #1546:

Author: iohk-bors[bot]

.buildkite/pipeline.yml

@@ -44,3 +44,9 @@ steps:
       - nix build .#roots.x86_64-linux --option allow-import-from-derivation false
     agents:
       system: x86_64-linux
+
+  - label: 'Check that evaluation of hydra jobs works without using remote builders'
+    command:
+      - nix-instantiate release.nix -A required-unstable-ghc8107-x86_64-darwin-native --show-trace --builders ''
+    agents:
+      system: x86_64-linux

build.nix

@@ -8,8 +8,9 @@ in
 { nixpkgs ? haskellNix.sources.nixpkgs-2111
 , nixpkgsArgs ? haskellNix.nixpkgsArgs
 , pkgs ? import nixpkgs nixpkgsArgs
+, evalPackages ? import nixpkgs nixpkgsArgs
 , nixpkgsForHydra ? haskellNix.sources.nixpkgs-2105
-, pkgsForHydra ? import nixpkgsForHydra nixpkgsArgs
+, pkgsForHydra ? import nixpkgsForHydra (nixpkgsArgs // { inherit (pkgs) system; })
 , ifdLevel ? 1000
 , compiler-nix-name ? throw "No `compiler-nix-name` passed to build.nix"
 }:
@@ -19,12 +20,13 @@ let
   buildHaskell = pkgs.buildPackages.haskell-nix;
   tool = buildHaskell.tool;
 in rec {
-  tests = import ./test/default.nix { inherit pkgs ifdLevel compiler-nix-name; };
+  tests = import ./test/default.nix { inherit pkgs evalPackages ifdLevel compiler-nix-name; };
 
   tools = pkgs.lib.optionalAttrs (ifdLevel >= 3) (
     pkgs.recurseIntoAttrs ({
-      cabal-latest = tool compiler-nix-name "cabal" "latest";
+      cabal-latest = tool compiler-nix-name "cabal" { inherit evalPackages; };
       hlint-latest = tool compiler-nix-name "hlint" {
+        inherit evalPackages;
         version = {
             "ghc865" = "3.2.8";
             "ghc882" = "3.3.6";
@@ -33,7 +35,7 @@ in rec {
           }.compiler-nix-name or "latest";
       };
     } // pkgs.lib.optionalAttrs (!__elem compiler-nix-name ["ghc921" "ghc922" "ghc923"]) {
-      hls-latest = tool compiler-nix-name "haskell-language-server" "latest";
+      hls-latest = tool compiler-nix-name "haskell-language-server" { inherit evalPackages; };
     })
   );
 
@@ -85,7 +87,7 @@ in rec {
   # These are pure parts of maintainer-script so they can be built by hydra
   # and added to the cache to speed up buildkite.
   maintainer-script-cache = pkgs.recurseIntoAttrs (
-      (pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux {
+      (pkgs.lib.optionalAttrs (pkgsForHydra.system == "x86_64-linux") {
         inherit (maintainer-scripts) check-hydra;
       })
     // (pkgs.lib.optionalAttrs (ifdLevel > 2) {

builder/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, buildPackages, stdenv, lib, haskellLib, ghc, compiler-nix-name, fetchurl, pkgconfig, nonReinstallablePkgs, hsPkgs, compiler }:
+{ pkgs, buildPackages, evalPackages, stdenv, lib, haskellLib, ghc, compiler-nix-name, fetchurl, pkgconfig, nonReinstallablePkgs, hsPkgs, compiler }:
 
 let
   # Builds a single component of a package.
@@ -46,6 +46,7 @@ let
   hoogleLocal = let
     nixpkgsHoogle = import (pkgs.path + /pkgs/development/haskell-modules/hoogle.nix);
   in { packages ? [], hoogle ? pkgs.buildPackages.haskell-nix.tool "ghc8107" "hoogle" {
+        inherit evalPackages;
         version = "5.0.18.3";
         index-state = pkgs.haskell-nix.internalHackageIndexState;
       }
@@ -66,7 +67,7 @@ let
 
   # Same as haskellPackages.shellFor in nixpkgs.
   shellFor = haskellLib.weakCallPackage pkgs ./shell-for.nix {
-    inherit hsPkgs ghcForComponent makeConfigFiles hoogleLocal haskellLib buildPackages compiler;
+    inherit hsPkgs ghcForComponent makeConfigFiles hoogleLocal haskellLib buildPackages evalPackages compiler;
     inherit (buildPackages) glibcLocales;
   };
 

builder/shell-for.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, mkShell, glibcLocales, pkgconfig, ghcForComponent, makeConfigFiles, hsPkgs, hoogleLocal, haskellLib, buildPackages, compiler }:
+{ lib, stdenv, mkShell, glibcLocales, pkgconfig, ghcForComponent, makeConfigFiles, hsPkgs, hoogleLocal, haskellLib, buildPackages, evalPackages, compiler }:
 
 { # `packages` function selects packages that will be worked on in the shell itself.
   # These packages will not be built by `shellFor`, but their
@@ -133,7 +133,12 @@ let
     # inherit (hsPkgs) hoogle;
   } // (
     lib.optionalAttrs (args ? tools && args.tools ? hoogle) {
-      hoogle = buildPackages.haskell-nix.tool compiler.nix-name "hoogle" args.tools.hoogle;
+      hoogle = buildPackages.haskell-nix.hackage-tool (
+        haskellLib.versionOrModToMods args.tools.hoogle ++ [{
+          name = "hoogle";
+          compiler-nix-name = compiler.nix-name;
+          inherit evalPackages;
+        }]);
     }
   ));
 
@@ -147,7 +152,7 @@ in
     nativeBuildInputs = [ ghcEnv ]
       ++ nativeBuildInputs
       ++ mkDrvArgs.nativeBuildInputs or []
-      ++ lib.attrValues (buildPackages.haskell-nix.tools compiler.nix-name tools)
+      ++ lib.attrValues (buildPackages.haskell-nix.tools evalPackages compiler.nix-name tools)
       # If this shell is a cross compilation shell include
       # wrapper script for running cabal build with appropriate args.
       # Includes `--with-compiler` in case the `cabal.project` file has `with-compiler:` in it.

changelog.md

@@ -1,6 +1,32 @@
 This file contains a summary of changes to Haskell.nix and `nix-tools`
 that will impact users.
 
+## Jul 22, 2022
+* Removed reliance on `builtins.currentSystem`.  It was used it to provide
+  `pkgs.evalPackages` via an overlay that it used to run derivations
+  used in imports from derivation (IFDs).
+
+  These derivations are now run on `buildPackages` by default.
+
+  Passsing `evalPackages` to a project function will change where all the
+  derivations used in IFDs are run for that project (including shell tools):
+    evalPackages = import nixpkgs haskellNix.nixpkgsArgs;
+
+  Passing `evalSystem` instead will use create a suitable `nixpkgs` using `pkgs.path`
+  and `pkgs.overlay`:
+    evalSystem = "x86_64-linux";
+  or
+    evalSystem = builtins.currentSystem;
+
+  The `haskellLib.cleanGit` function is also affected by this change.  If you are cross
+  compiling and using `cleanGit` you should probably do something like:
+    pkgs = import nixpkgs haskellNix.nixpkgsArgs;
+    evalPackages = import nixpkgs (haskellNix.nixpkgsArgs // { system = evalSystem; });
+    p = pkgs.pkgsCross.mingwW64.haskell-nix.cabalProject {
+      inherit evalPackages;
+      src = evalPackages.haskell-nix.haskellLib.cleanGit { src = ./.; };
+    };
+
 ## Feb 16, 2022
 * Removed lookupSha256 argument from project functions.
   Pass a `sha256map` instead.

ci.nix

@@ -78,12 +78,11 @@
 in
 dimension "Nixpkgs version" nixpkgsVersions (nixpkgsName: nixpkgs-pin:
   let pinnedNixpkgsSrc = sources.${nixpkgs-pin};
-      # We need this for generic nixpkgs stuff at the right version
-      genericPkgs = import pinnedNixpkgsSrc {};
-  in dimension "GHC version" (compilerNixNames nixpkgsName genericPkgs) (compiler-nix-name: {runTests}:
-    dimension "System" (systems nixpkgsName genericPkgs compiler-nix-name) (systemName: system:
+      evalPackages = import pinnedNixpkgsSrc nixpkgsArgs;
+  in dimension "GHC version" (compilerNixNames nixpkgsName evalPackages) (compiler-nix-name: {runTests}:
+    dimension "System" (systems nixpkgsName evalPackages compiler-nix-name) (systemName: system:
       let pkgs = import pinnedNixpkgsSrc (nixpkgsArgs // { inherit system; });
-          build = import ./build.nix { inherit pkgs ifdLevel compiler-nix-name; };
+          build = import ./build.nix { inherit pkgs evalPackages ifdLevel compiler-nix-name; };
           platformFilter = platformFilterGeneric pkgs system;
       in filterAttrsOnlyRecursive (_: v: platformFilter v && !(isDisabled v)) ({
         # Native builds
@@ -96,14 +95,14 @@ dimension "Nixpkgs version" nixpkgsVersions (nixpkgsName: nixpkgs-pin:
         } // pkgs.lib.optionalAttrs (ifdLevel >= 1) {
           iserv-proxy = pkgs.ghc-extra-projects."${compiler-nix-name}".getComponent "iserv-proxy:exe:iserv-proxy";
         } // pkgs.lib.optionalAttrs (ifdLevel >= 3) {
-          hello = (pkgs.haskell-nix.hackage-package { name = "hello"; version = "1.0.0.2"; inherit compiler-nix-name; }).getComponent "exe:hello";
+          hello = (pkgs.haskell-nix.hackage-package { name = "hello"; version = "1.0.0.2"; inherit evalPackages compiler-nix-name; }).getComponent "exe:hello";
         });
       }
       //
-      dimension "Cross system" (crossSystems nixpkgsName genericPkgs compiler-nix-name system) (crossSystemName: crossSystem:
+      dimension "Cross system" (crossSystems nixpkgsName evalPackages compiler-nix-name system) (crossSystemName: crossSystem:
         # Cross builds
         let pkgs = import pinnedNixpkgsSrc (nixpkgsArgs // { inherit system crossSystem; });
-            build = import ./build.nix { inherit pkgs ifdLevel compiler-nix-name; };
+            build = import ./build.nix { inherit pkgs evalPackages ifdLevel compiler-nix-name; };
         in pkgs.recurseIntoAttrs (pkgs.lib.optionalAttrs (ifdLevel >= 1) ({
             roots = pkgs.haskell-nix.roots' compiler-nix-name ifdLevel;
             ghc = pkgs.buildPackages.haskell-nix.compiler."${compiler-nix-name}";

flake.nix

@@ -59,7 +59,7 @@
     };
   };
 
-  outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-2105, flake-utils, ... }@inputs:
+  outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-2105, nixpkgs-2111, nixpkgs-2205, flake-utils, ... }@inputs:
     let compiler = "ghc923";
       config = import ./config.nix;
     in {
@@ -101,6 +101,12 @@
             };
             pkgs = import nixpkgs
               (nixpkgsArgs // { localSystem = { inherit system; }; });
+            pkgs-2105 = import nixpkgs-2105
+              (nixpkgsArgs // { localSystem = { inherit system; }; });
+            pkgs-2111 = import nixpkgs-2111
+              (nixpkgsArgs // { localSystem = { inherit system; }; });
+            pkgs-2205 = import nixpkgs-2205
+              (nixpkgsArgs // { localSystem = { inherit system; }; });
             pkgs-unstable = import nixpkgs-unstable
               (nixpkgsArgs // { localSystem = { inherit system; }; });
             hix = import ./hix/default.nix { inherit pkgs; };

hix/project.nix

@@ -56,20 +56,20 @@ let
         nixpkgsArgs = config.haskellNix.nixpkgsArgs // {
           overlays = config.haskellNix.nixpkgsArgs.overlays ++ config.overlays;
         };
-        pkgs = import config.nixpkgs config.nixpkgsArgs;
-        project = config.pkgs.haskell-nix.project [
+        _module.args.pkgs = import config.nixpkgs config.nixpkgsArgs;
+        project = pkgs.haskell-nix.project [
             (import ../modules/hix-project.nix)
             userDefaults
             projectDefaults
             commandArgs'
-            {
+            ({config, ...}: {
               src =
                 if __pathExists (toString (src.origSrcSubDir or src) + "/.git")
-                  then config.pkgs.haskell-nix.haskellLib.cleanGit {
+                  then config.evalPackages.haskell-nix.haskellLib.cleanGit {
                     inherit src name;
                   }
                   else src;
-            }
+            })
           ];
       })
     ];

lib/cabal-project-parser.nix

@@ -122,7 +122,7 @@ let
   # This works because `cabal configure` does not include any of the `/nix/sore/`
   # paths in the `plan.json` (so materialized plan-nix will still work as expeced).
   # See tests/unit.nix for examples of input and output.
-  parseRepositoryBlock = cabalProjectFileName: sha256map: inputMap: cabal-install: nix-tools: block:
+  parseRepositoryBlock = evalPackages: cabalProjectFileName: sha256map: inputMap: cabal-install: nix-tools: block:
     let
       lines = pkgs.lib.splitString "\n" block;
       # The first line will contain the repository name.
@@ -138,7 +138,7 @@ let
       # The $HOME/.cabal/packages/${name} after running `cabal v2-update` to download the repository
       repoContents = if inputMap ? ${attrs.url}
         # If there is an input use it to make `file:` url and create a suitable `.cabal/packages/${name}` directory
-        then pkgs.evalPackages.runCommand name ({
+        then evalPackages.runCommand name ({
           nativeBuildInputs = [ cabal-install ];
           preferLocalBuild = true;
         }) ''
@@ -155,9 +155,9 @@ let
             cabal v2-update ${name}
             cp -r $HOME/.cabal/packages/${name} $out
         ''
-        else pkgs.evalPackages.runCommand name ({
-          nativeBuildInputs = [ cabal-install pkgs.evalPackages.curl nix-tools ];
-          LOCALE_ARCHIVE = pkgs.lib.optionalString (pkgs.evalPackages.stdenv.buildPlatform.libc == "glibc") "${pkgs.evalPackages.glibcLocales}/lib/locale/locale-archive";
+        else evalPackages.runCommand name ({
+          nativeBuildInputs = [ cabal-install evalPackages.curl nix-tools ];
+          LOCALE_ARCHIVE = pkgs.lib.optionalString (evalPackages.stdenv.buildPlatform.libc == "glibc") "${evalPackages.glibcLocales}/lib/locale/locale-archive";
           LANG = "en_US.UTF-8";
           preferLocalBuild = true;
         } // pkgs.lib.optionalAttrs (sha256 != null) {
@@ -175,15 +175,15 @@ let
               ${pkgs.lib.optionalString (attrs ? key-threshold) "key-threshold: ${attrs.key-threshold}"}
             EOF
 
-            export SSL_CERT_FILE=${pkgs.evalPackages.cacert}/etc/ssl/certs/ca-bundle.crt
+            export SSL_CERT_FILE=${evalPackages.cacert}/etc/ssl/certs/ca-bundle.crt
             cabal v2-update ${name}
             cp -r $HOME/.cabal/packages/${name} $out
         '';
       # Output of hackage-to-nix
       hackage = import (
-        pkgs.evalPackages.runCommand ("hackage-to-nix-" + name) {
-          nativeBuildInputs = [ cabal-install pkgs.evalPackages.curl nix-tools ];
-          LOCALE_ARCHIVE = pkgs.lib.optionalString (pkgs.evalPackages.stdenv.buildPlatform.libc == "glibc") "${pkgs.evalPackages.glibcLocales}/lib/locale/locale-archive";
+        evalPackages.runCommand ("hackage-to-nix-" + name) {
+          nativeBuildInputs = [ cabal-install evalPackages.curl nix-tools ];
+          LOCALE_ARCHIVE = pkgs.lib.optionalString (evalPackages.stdenv.buildPlatform.libc == "glibc") "${evalPackages.glibcLocales}/lib/locale/locale-archive";
           LANG = "en_US.UTF-8";
           preferLocalBuild = true;
         } ''
@@ -196,11 +196,11 @@ let
       };
     };
 
-  parseRepositories = cabalProjectFileName: sha256map: inputMap: cabal-install: nix-tools: projectFile:
+  parseRepositories = evalPackages: cabalProjectFileName: sha256map: inputMap: cabal-install: nix-tools: projectFile:
     let
       # This will leave the name of repository in the first line of each block
       blocks = pkgs.lib.splitString "\nrepository " ("\n" + projectFile);
-      repoBlocks = builtins.map (parseRepositoryBlock cabalProjectFileName sha256map inputMap cabal-install nix-tools) (pkgs.lib.lists.drop 1 blocks);
+      repoBlocks = builtins.map (parseRepositoryBlock evalPackages cabalProjectFileName sha256map inputMap cabal-install nix-tools) (pkgs.lib.lists.drop 1 blocks);
     in {
       extra-hackages = pkgs.lib.lists.map (block: block.hackage) repoBlocks;
       repos = pkgs.lib.lists.foldl' (x: block: x // block.repo) {} repoBlocks;