#!/bin/bash -x

# mkdmg - create a dmg disk image from app, pkg mpkg or directory
#
#	intended for smallish packages in Munki repo
#
#	cudos	https://github.com/hjuutilainen	wrap-dmg.py
# 
# 2016-02-24, LTu

if [ "1" -ne "$#" ] # wrong count of command line arguments
then
	echo "usage: $0 app-pkg-mpkg-or-folder"

elif [[ -e $1 &&
	$1 =~ .*\.app$  ||
	$1 =~ .*\.app/$ ||
	$1 =~ .*\.pkg$  ||
	$1 =~ .*\.mpkg$ ||
	-d $1
     ]]
then	# attempt image file creation

	name=$( basename $1 | sed -e 's/\..*$//' )

	tmpdir=$( uuidgen )

	mkdir $tmpdir

	version=$( awk ' /rtVer/ {	# extract .app version...
			getline
			gsub( /^[ \t]+<string>|<.*$/, "" )
			print
			exit
		} ' ${1}/Contents/Info.plist	\
			 ||			\
			echo X.y	# ...or default to X.y
	)

	# hdiutil likes directory contents to be similar to .dmg contents

	tar -cf - -- "$1" | (cd $tmpdir && tar -x)

	hdiutil create -srcFolder $tmpdir	\
		-format UDZO			\
		-volname $name			\
		-uid 99				\
		-gid 99				\
		-mode 555			\
		-noscrub			\
		${name}-${version}.dmg

	rm -rf $tmpdir
else
	echo "\"$1\" not found or not .app, .pkg, .mpkg or folder"	
fi