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{ writeScriptBin, stdenv, git, coreutils, patch }:
writeScriptBin "git-detach" ''
#!${stdenv.shell}
if [ $# -le 0 -o "$1" = "--help" -o "$1" = "-h" ]; then
echo "Usage: $0 COMMAND [ARGS...]" >&2
echo >&2
echo "Run COMMAND in a clean Git working directory" >&2
echo "without untracked files and .git directory." >&2
exit 1
fi
diffToHead="$("${git}/bin/git" diff HEAD)"
if tmpdir="$("${coreutils}/bin/mktemp" -d git-detach.XXXXXXXXXX)"; then
trap "rm -rf '${"\${tmpdir//\\'/\\'\\\\\\'\\'}"}'" EXIT
"${git}/bin/git" archive --format=tar HEAD | (
set -e
basedir="$tmpdir/$("${coreutils}/bin/basename" "$(pwd)")"
mkdir "$basedir"
cd "$basedir"
tar x
if [ -n "$diffToHead" ]; then
echo "$diffToHead" | "${patch}/bin/patch" -s -p1
fi
exec "$@"
)
exit $?
else
echo "Unable to create temporary directory!" >&2
fi
''
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