#! /bin/sh
#
# createDiskImage
 
# Requires three or more args
if [ $# -lt 3 ] ; then
    echo "usage: $0 <ImageSizeInMegabytes> <NameOfImageWithNoExtension> <FolderToCopyToImage> ..."
    exit 1
fi
 
# Grab the size and image name arguments.  Leave the rest of them in $*
imageSize=$1
shift
imageName=$1
shift
 
# Create the image and format it
echo
echo "Creating ${imageSize} MB disk image named ${imageName}..."
 
rm -f ${imageName}.dmg
hdiutil create ${imageName}.dmg -megabytes ${imageSize} -layout NONE
 
hdidOutput=`hdid -nomount ${imageName}.dmg | grep '/dev/disk[0-9]*'`
 
sudo /sbin/newfs_hfs -w -v ${imageName} -b 4096  ${hdidOutput}
 
hdiutil eject ${hdidOutput}
 
# Mount the image and copy stuff
hdidOutput=`hdid ${imageName}.dmg | grep '/dev/disk[0-9]*' | awk '{print $1}'`
sleep 4 # This sleep is needed and there seems to be no way to know when the image is mounted...
 
echo "Copying contents to ${imageName}..."
while [ $# -gt 0 ] ; do
    echo "...copying ${1}"
    /Developer/Tools/CpMac -r ${1} /Volumes/${imageName}
    shift
done
 
hdiutil eject ${hdidOutput}
 
# Compress the image
echo "Compressing ${imageName} disk image..."
 
mv ${imageName}.dmg ${imageName}.orig.dmg
hdiutil convert ${imageName}.orig.dmg -format UDCO -o ${imageName}
rm ${imageName}.orig.dmg
 
echo "Done."
echo