Run multiple scripts for the same git hook

multiple-git-hooks.sh

#!/bin/bash

# This script should be saved in a git repo as a hook file, e.g. .git/hooks/pre-receive.
# It looks for scripts in the .git/hooks/pre-receive.d directory and executes them in order,
# passing along stdin. If any script exits with a non-zero status, this script exits.

local_script_dir=".git/hooks"
script_dir=$(dirname $0)
hook_name=$(basename $0)

stdin=$(cat /dev/stdin)

hooks=()

function add_file_to_hooks {
  file=$1

  if [ -f $file ]; then
    hooks+=($file)
  fi
}

function add_files_to_hooks {
  dir=$1

  if [ -d $dir ] && [ $(ls -A $dir) ]; then
    for hook in $dir/*; do
      hooks+=($hook)
    done
  fi
}

if [ ! "$local_script_dir" -ef "$script_dir" ]; then
  add_file_to_hooks "$local_script_dir/$hook_name"
  add_files_to_hooks "$local_script_dir/$hook_name.d"
fi
add_files_to_hooks "$script_dir/$hook_name.d"

for hook in ${hooks[@]}; do
  echo "$stdin" | $hook "$@"

  exit_code=$?

  if [ $exit_code != 0 ]; then
    exit $exit_code
  fi
done

exit 0