I have an operating system install image that I need to install in VMware Fusion. The problem is the install image is a MacOS disk image file, or .dmg. I need a DVD image, or a .iso, in order to boot the VM and do the install.
It turns out that the Mac OS X command hdiutil to convert the .dmg to a .iso:
hdiutil convert .dmg -format UDTO -o .iso
See the hdiutil(1) manpage for more info.