Using a detached header

[whitepj]

Scenario: Mount luks file using a detached header:

/sbin/cryptsetup --verbose luksOpen --type luks2 --header luksheader.img /dev/loop8 mybackup

Enrolling a yubikey key slot appears to work OK:

yubikey-luks-enroll -d luksheader.img -s 1

However, we cannot actually open the volume with yubikey-luks-open, because we can't currently pass both the header and the volume through to cryptsetup.