I am using genisoimage and the dmg util from hfsplus-tools on RH 9.3 to produce dmg files on Linux. Specifically, a common java program is jpackage on 2 different platforms (intel mac and newer apple silicon M2). Each output DMG is opened with hdiutil mount -nobrowse file.dmg and the tree of contents scp’d to Linux in separate architecture-specific directories. This allows us to create a Linux-based “template”. New versions of jar files can be compiled and dropped into the template directly on Linux and the DMG created independent of the Mac. The key differentiator in the two templates is the architecture-specific launcher program i.e.