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# The program `remove-references-to' created by this derivation replaces all
# references to the given Nix store paths in the specified files by a
# non-existent path (/nix/store/eeee...). This is useful for getting rid of
# dependencies that you know are not actually needed at runtime.
{ stdenv, writeScriptBin }:
writeScriptBin "remove-references-to" ''
#! ${stdenv.shell} -e
# References to remove
targets=()
while getopts t: o; do
case "$o" in
t) storeId=$(echo "$OPTARG" | sed -n "s|^$NIX_STORE/\\([a-z0-9]\{32\}\\)-.*|\1|p")
if [ -z "$storeId" ]; then
echo "-t argument must be a Nix store path"
exit 1
fi
targets+=("$storeId")
esac
done
shift $(($OPTIND-1))
# Files to remove the references from
regions=()
for i in "$@"; do
test ! -L "$i" -a -f "$i" && regions+=("$i")
done
for target in "''${targets[@]}" ; do
sed -i -e "s|$NIX_STORE/$target-|$NIX_STORE/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-|g" "''${regions[@]}"
done
''