Currently the baremetal ipi platform requires mkisofs to build the Config drive containing user data. Ironic has the ability to build this for the user in the most recent versions. The fix for this should be backported to 4.3 so when installing baremetal via Hive this dependency isn’t required.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:0581