Comment 2 for bug 916414

The proper solution is one of these:
- set icon and background without 'Finder'
- add option to build script to disable icon and background in automated builds

A few other tools and scripts to set icon and background of dmg file is discussed here:

http://stackoverflow.com/questions/96882/how-do-i-create-a-nice-looking-dmg-for-mac-os-x-using-command-line-tools

Some tools discussed there:
- http://www.yoursway.com/free/#createdmg
- http://c-command.com/dropdmg/
- http://www.objectpark.org/buildDMG.html
- http://hg.adium.im/adium/file/c3da6ccb3f7f/Release
  - these scripts from adium seems to be a good base since they do not need Mac OS X gui to create dmg with icon and background