#!/bin/sh
is_substring() {
	case $2 in
	*$1*)
		return 0
		;;
	*)
		return 1
		;;
	esac
}

fail() {
	# TODO: make this exit cleanly, and from any subshell
	echo "Something went wrong, exiting..."
	exit
}

find_key_file() {
	search_dir="$1"
	for file in "$search_dir"/*
	do
		if cat "$file" | head -n1 | grep -q -- '-----BEGIN .* PRIVATE KEY-----'
		then
			echo "$file"
		fi
			
	done
}