#!/bin/bash
#
# Copyright 2013 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

set -eu
set -o pipefail

SCRIPT_NAME=$(basename $0)
SCRIPT_HOME=$(dirname $0)

function show_options {
    echo "Usage: $SCRIPT_NAME"
    echo
    echo "Create a random password."
    echo
    echo "This outputs a random password."
    echo
    echo "The password is made by taking a uuid and passing it though sha1sum."
    echo "We may change this in future to gain more entropy."
    echo
    exit $1
}

TEMP=`getopt -o h -n $SCRIPT_NAME -- "$@"`
if [ $? != 0 ]; then
    echo "Terminating..." >&2;
    exit 1;
fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -h) show_options 0;;
        --) shift ; break ;;
        *) echo "Error: unsupported option $1." ; exit 1 ;;
    esac
done

EXTRA=${1:-""}

if [ -n "$EXTRA" ]; then
    show_options 1
fi

uuidgen | sha1sum | awk '{print $1}'