#!/bin/bash

# This Source Code Form is subject to the terms of the Mozilla Public

# License, v. 2.0. If a copy of the MPL was not distributed with this

# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# Unpack a disk image to a specified target folder

#

# Usage: unpack-diskimage <image_file>

#                         <mountpoint>

#                         <target_path>

DMG_PATH=$1

MOUNTPOINT=$2

TARGETPATH=$3

# How long to wait before giving up waiting for the mount to finish (seconds)

TIMEOUT=90

# If mnt already exists, then the previous run may not have cleaned up

# properly.  We should try to umount and remove the mnt directory.

if [ -d $MOUNTPOINT ]; then

    echo "mnt already exists, trying to clean up"

    hdiutil detach $MOUNTPOINT -force

    rm -rdfv $MOUNTPOINT

fi

# Install an on-exit handler that will unmount and remove the '$MOUNTPOINT' directory

trap "{ if [ -d $MOUNTPOINT ]; then hdiutil detach $MOUNTPOINT -force; rm -rdfv $MOUNTPOINT; fi; }" EXIT

mkdir -p $MOUNTPOINT

hdiutil attach -verbose -noautoopen -mountpoint $MOUNTPOINT "$DMG_PATH"

# Wait for files to show up

# hdiutil uses a helper process, diskimages-helper, which isn't always done its

# work by the time hdiutil exits. So we wait until something shows up in the

# mnt directory. Due to the async nature of diskimages-helper, the best thing

# we can do is to make sure the glob() rsync is making can find files.

i=0

while [ "$(echo $MOUNTPOINT/*)" == "$MOUNTPOINT/*" ]; do

    if [ $i -gt $TIMEOUT ]; then

        echo "No files found, exiting"

        exit 1

    fi

    sleep 1

    i=$(expr $i + 1)

done

# Now we can copy everything out of the $MOUNTPOINT directory into the target directory

rsync -av $MOUNTPOINT/* $MOUNTPOINT/.DS_Store $MOUNTPOINT/.background $MOUNTPOINT/.VolumeIcon.icns $TARGETPATH/.

hdiutil detach $MOUNTPOINT

rm -rdf $MOUNTPOINT

# diskimage-helper prints messages to stdout asynchronously as well, sleep

# for a bit to ensure they don't disturb following commands in a script that

# might parse stdout messages

sleep 5