How to build a dmg Mac OS X file (on a non-Mac platform)?

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Yep, mkfs.hfsplus does it.

dd if=/dev/zero of=/tmp/foo.dmg bs=1M count=64
mkfs.hfsplus -v ThisIsFoo /tmp/foo.dmg

This creates a dmg file (in this case 64M) that can be mounted on a mac. It can also be mounted on linux, with something like

mount -o loop /tmp/foo.dmg /mnt/foo

after wich you just copy the content you want to it (in /mnt/foo). Unmount it, and the dmg can be copied over to a mac and mounted there.

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