1 files changed, 56 insertions, 0 deletions
diff --git a/pkgs/by-name/ha/hare/hook.nix b/pkgs/by-name/ha/hare/hook.nix
new file mode 100644
index 0000000000000..e5a9bad131aa4
--- /dev/null
+++ b/pkgs/by-name/ha/hare/hook.nix
@@ -0,0 +1,56 @@
+{
+  hare,
+  lib,
+  makeSetupHook,
+  makeWrapper,
+  runCommand,
+  stdenv,
+  writeShellApplication,
+}:
+let
+  arch = stdenv.targetPlatform.uname.processor;
+  harePropagationInputs = builtins.attrValues { inherit (hare) harec qbe; };
+  hareWrappedScript = writeShellApplication {
+    # `name` MUST be `hare`, since its role is to replace the hare binary.
+    name = "hare";
+    runtimeInputs = [ hare ];
+    excludeShellChecks = [ "SC2086" ];
+    # ''${cmd:+"$cmd"} is used on the default case to keep the same behavior as
+    # the hare binary: If "$cmd" is passed directly and it's empty, the hare
+    # binary will treat it as an unrecognized command.
+    text = ''
+      readonly cmd="$1"
+      shift
+      case "$cmd" in
+        "test"|"run"|"build") exec hare "$cmd" $NIX_HAREFLAGS "$@" ;;
+        *) exec hare ''${cmd:+"$cmd"} "$@"
+      esac
+    '';
+  };
+  hareWrapper = runCommand "hare-wrapper" { nativeBuildInputs = [ makeWrapper ]; } ''
+    mkdir -p $out/bin
+    install ${lib.getExe hareWrappedScript} $out/bin/hare
+    makeWrapper ${lib.getExe hare} $out/bin/hare-native \
+      --inherit-argv0 \
+      --unset AR \
+      --unset LD \
+      --unset CC
+  '';
+in
+makeSetupHook {
+  name = "hare-hook";
+  # The propagation of `qbe` and `harec` (harePropagationInputs) is needed for
+  # build frameworks like `haredo`, which set the HAREC and QBE env vars to
+  # `harec` and `qbe` respectively. We use the derivations from the `hare`
+  # package to assure that there's no different behavior between the `hareHook`
+  # and `hare` packages.
+  propagatedBuildInputs = [ hareWrapper ] ++ harePropagationInputs;
+  substitutions = {
+    hare_unconditional_flags = "-q -a${arch}";
+    hare_stdlib = "${hare}/src/hare/stdlib";
+  };
+  meta = {
+    description = "A setup hook for the Hare compiler";
+    inherit (hare.meta) badPlatforms platforms;
+  };
+} ./setup-hook.sh