Link the given pre-commit hook to current pwd git repository or to those in arguments

fedpk-add-patch-check.sh

#!/bin/bash

HOOK=/usr/lib/fedpkg-patch-check.py

function addhook {
    hookdir="${1%%/}/.git/hooks"
    test -d "$hookdir" || (echo "$hookdir doesn't exist or is not a directory" 1>&2 && return 1)
    test -h "$hookdir/pre-commit" && echo "$hookdir/pre-commit is already a link, skipping" 1>&2 && return 1
    test -f "$hookdir/pre-commit" && echo "$hookdir/pre-commit is a file, you should call $HOOK manually from that file depending on what language is your hook written in" 1>&2 && return 1
    ln -s $HOOK "$hookdir/pre-commit" || (echo "Could not link the hook into $hookdir" 1>&2 && return 1)
    chmod +x "$hookdir/pre-commit"
}

if [ $# -eq 0 ]; then
    dir="`git rev-parse --show-toplevel`" || exit $?
    addhook "$dir"
else
    for i in "$@"; do 
        addhook "$i"
    done
fi