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#! /usr/bin/env nix-shell
#! nix-shell -i bash -p coreutils haskellPackages.cabal2nix-latest -I nixpkgs=.
# This script is used to regenerate nixpkgs' Haskell package set, using a tool
# called hackage2nix. hackage2nix looks at
# pkgs/development/haskell-modules/configuration-hackage2nix.yaml and generates
# a Nix expression for package version specified there, using the Cabal files
# from the Hackage database (available under all-cabal-hashes) and its
# companion tool cabal2nix.
#
# Related scripts are update-hackage.sh, for updating the snapshot of the
# Hackage database used by hackage2nix, and update-cabal2nix-latest.sh,
# for updating the version of hackage2nix used to perform this task.
set -euo pipefail
extractionDerivation='with import ./. {}; runCommand "unpacked-cabal-hashes" { } "tar xf ${all-cabal-hashes} --strip-components=1 --one-top-level=$out"'
unpacked_hackage="$(nix-build -E "$extractionDerivation" --no-out-link)"
hackage2nix --hackage "$unpacked_hackage" --preferred-versions <(for n in "$unpacked_hackage"/*/preferred-versions; do cat "$n"; echo; done) --nixpkgs "$PWD" --config pkgs/development/haskell-modules/configuration-hackage2nix.yaml
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