New command: cat

[boredzo]

Given one or more raw disk images, create a new partition map containing those partitions in order.

For source images that contain bare volumes, the bare volume will be added as a new (probably Apple_HFS) partition. For source images that contain partitions, those partitions will be added in the same order as in the source.

Options include:

• --partition-map-format=im5/im4: IM4 partition maps will reject any partitions that aren't of type Apple_Driver (added to the DDB but not the partition map) or Apple_HFS (added to the partition map as 'TFS1').
• --driver=…: Specify a driver to include in the new partition map. Default is auto: if any source images contain a driver, don't add any new drivers; otherwise, add the default driver. default adds a yet-to-be-chosen driver from the old days (likely from some version of Apple HD SC Setup). none adds no driver partition, like pdisk. 

[boredzo]

If --partition-map-format is im4, the command should limit the number of partitions to 42. https://github.com/boredzo/impluse-hfs/issues/23

(Unless, of course, more than 42 partitions actually does work somehow. But it appears to be impossible by my reading of the IM4 text.)