mkdmg

#!/bin/sh
set -e
if [[ $# != 4 ]]; then
    echo "Usage: mkdmg <source_dir> <size_blocks> <title> <version>"
    exit 1
fi
source="$1"
size=$2
title="$3"
version="$4"

finalDMGName="${title}-${version}.dmg"
applicationName=applicationName

if (($size==0)); then
    size=$(du -ks "$source" | awk '{print $1}')
    size=$(($size+100))
fi
if (($size<600)); then
    size=600
fi
echo "size $source $size "
 
#Create a R/W DMG. It must be larger than the result will be. In this example, the bash variable "size" contains the size in Kb and the contents of the folder in the "source" bash variable will be copied into the DMG:

rm -f pack.temp.dmg "$finalDMGName"

hdiutil create -srcfolder "${source}" -volname "${title}" -fs HFS+ \
      -fsargs "-c c=64,a=16,e=16" -format UDRW -size ${size}k pack.temp.dmg

# Unmount old image
[[ -d "/Volumes/${title}" ]] && hdiutil detach "/Volumes/${title}"
#Mount the disk image, and store the device name (you might want to use sleep for a few seconds after this operation):

device=$(hdiutil attach -readwrite -noverify -noautoopen "pack.temp.dmg" | \
         egrep '^/dev/' | sed 1q | awk '{print $1}')
sleep 3

#Use AppleScript to set the visual styles (name of .app must be in bash variable "applicationName", use variables for the other properties as needed):

echo '
   activate application "Finder"
   tell application "Finder"
     tell disk "'${title}'"
           open
           set current view of container window to icon view
           set toolbar visible of container window to true
           set statusbar visible of container window to true
           set the bounds of container window to {400, 100, 885, 430}
           set theViewOptions to the icon view options of container window
           set arrangement of theViewOptions to not arranged
           set icon size of theViewOptions to 72
           close
     end tell
   end tell
' | osascript

#           open
#           update without registering applications
#           delay 5
#           eject

#           make new alias file at container window to POSIX file "/Applications" with properties {name:"Applications"}
#           set position of item "'${applicationName}'" of container window to {100, 100}
#           set position of item "Applications" of container window to {375, 100}
#           set background picture of theViewOptions to file ".background:'${backgroundPictureName}'"

#Finialize the DMG by setting permissions properly, compressing and releasing it:

chmod -Rf go-w /Volumes/"${title}" || echo "chmod"
sync
sync
hdiutil detach ${device}
hdiutil convert "pack.temp.dmg" -format UDZO -imagekey zlib-level=9 -o "${finalDMGName}"
rm -rf pack.temp.dmg 

exit 0