#!/bin/sh -x

[ "$#" -lt 2 ] && echo "Usage: sign_dmg.sh <dmg> <identity>" && exit

src_dmg="$1"
tmp_dmg="writable_$1"
signed_dmg="signed_$1"
identity="$2"
mount="/Volumes/$(basename "$src_dmg"|sed 's,-\([0-9]\)\(.*\),,')"
test -e "$tmp_dmg" && rm -rf "$tmp_dmg"
hdiutil convert "$src_dmg" -format UDRW -o "$tmp_dmg"
hdiutil attach "$tmp_dmg"
pushd "$mount"
codesign -s "$identity" "$mount"/*.app
popd
diskutil eject "$mount"
test -e "$signed_dmg" && rm -rf "$signed_dmg"
hdiutil convert "$tmp_dmg" -format UDBZ -o "$signed_dmg"