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 #!/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