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nixpkgs/pkgs/development/compilers/ghc-wrapper/builder.sh

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source $stdenv/setup
export HOME=$(pwd)/fake-home
makeWrapper() {
wrapperBase="$1"
wrapperName="$2"
wrapper="$out/$wrapperName"
shift; shift #the other arguments are passed to the source app
echo '#!'"$SHELL" > "$wrapper"
echo "exec \"$wrapperBase/$wrapperName\" $@" '"$@"' > "$wrapper"
chmod +x "$wrapper"
}
mkdir -p $out/nix-support $out/bin
packages_db=$out/nix-support/package.conf
#create packages database (start with compiler base packages)
cp $ghc/lib/ghc-*/package.conf $packages_db
chmod +w $packages_db
for lib in $libraries; do
sh $lib/nix-support/register.sh $packages_db || exit 1
done
rm -f $packages_db.old
#create the wrappers
#NB: The double dash for ghc-pkg is not a typo!
makeWrapper $ghc "bin/ghc" "-package-conf" $packages_db
makeWrapper $ghc "bin/ghci" "-package-conf" $packages_db
makeWrapper $ghc "bin/runghc" "-package-conf" $packages_db
makeWrapper $ghc "bin/runhaskell" "-package-conf" $packages_db
makeWrapper $ghc "bin/ghc-pkg" "--global-conf" $packages_db
# todo: link all other binaries of ghc