From 1e7351550cf05f2c467c240ea93b245a2b6bf7c2 Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Sat, 5 Jun 2021 16:08:32 +0200
Subject: [PATCH] =?UTF-8?q?maintainers/=E2=80=A6/regenerate-hackage-packag?=
 =?UTF-8?q?es.sh:=20overrideable=20hackage2nix?=
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Allow setting the HACKAGE2NIX environment variable to change the
hackage2nix the script uses to an absolute path to a local build. Useful
to test local changes in a realistic environment.
---
 maintainers/scripts/haskell/regenerate-hackage-packages.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/maintainers/scripts/haskell/regenerate-hackage-packages.sh b/maintainers/scripts/haskell/regenerate-hackage-packages.sh
index 1effa5e2596c9..e7f91f2d79d18 100755
--- a/maintainers/scripts/haskell/regenerate-hackage-packages.sh
+++ b/maintainers/scripts/haskell/regenerate-hackage-packages.sh
@@ -14,6 +14,8 @@
 
 set -euo pipefail
 
+HACKAGE2NIX="${HACKAGE2NIX:-hackage2nix}"
+
 # To prevent hackage2nix fails because of encoding.
 # See: https://github.com/NixOS/nixpkgs/pull/122023
 export LC_ALL=C.UTF-8
@@ -23,7 +25,7 @@ unpacked_hackage="$(nix-build -E "$extraction_derivation" --no-out-link)"
 config_dir=pkgs/development/haskell-modules/configuration-hackage2nix
 
 echo "Starting hackage2nix to regenerate pkgs/development/haskell-modules/hackage-packages.nix ..."
-hackage2nix \
+"$HACKAGE2NIX" \
    --hackage "$unpacked_hackage" \
    --preferred-versions <(for n in "$unpacked_hackage"/*/preferred-versions; do cat "$n"; echo; done) \
    --nixpkgs "$PWD" \