Creating a DMG with an icon and background image

[Posted with permission from my client.]

Our Release mode build is designed to package up the final app bundle into a dmg. We wanted to make a nice user experience, similar to the images of Google Chrome and Firefox, so we added an alias to /Applications and set the alias' name to " ".
We use an applescript to set the position and size of the icons in icon view, and also to set the background image. However, we could not figure out how to set the icon for the mounted volume in Finder's sidebar. I knew that it involed .VolumeIcon.icns, but that was insufficient.
After much searching, we realized that we had to set extended Finder attributes for the volume's root directory, but couldn't figure out how to do so from the shell / applescript. Finally, we found xattr, but there was no documentation to indicate what names or attributes to use. However, Google Chrome and Firefox both had the same set of 32 4-byte hex flags, so we simply copied them.

Solution: with read/write dmg mounted (and a disk name of VOLUME_NAME), use the following command from the Terminal (or shell script):

xattr -wx com.apple.FinderInfo 00000000000000000400FFFFFFFF000000000000000000000000000000000000 "/Volumes/${VOLUME_NAME}"


UPDATE:
There is a much more intuitive interface: SetFile -a C "/Volumes/${VOLUME_NAME}".