Switch to xorriso causes failure in ppc64 image generation

[Paride Legovini]

The switch from mkisofs to `xorriso -as mkisofs` introduced in this change:

https://bazaar.launchpad.net/~ubuntu-cdimage/debian-cd/ubuntu/revision/2061

causes the following failure while generating the ppc64el iso images:

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xorriso -as mkisofs -r -checksum_algorithm_iso md5,sha1 -V Ubuntu-Server\ 20.10\ ppc64 -o /srv/cdimage.ubuntu.com/scratch/ubuntu-server/groovy/daily-live/debian-cd/ppc64el/groovy-live-server-ppc64el.raw --netatalk -hfs -probe -map /srv/cdimage.ubuntu.com/debian-cd/data/hfs.map -chrp-boot -iso-level 4 -part -no-desktop -hfs-bless CD1/install -hfs-volid Ubuntu-Server_PPC64EL_groovy -sort /srv/cdimage.ubuntu.com/scratch/ubuntu-server/groovy/daily-live/tmp/groovy-ppc64el/1.weights CD1
xorriso 1.4.2 : RockRidge filesystem manipulator, libburnia project.

Drive current: -outdev 'stdio:/srv/cdimage.ubuntu.com/scratch/ubuntu-server/groovy/daily-live/debian-cd/ppc64el/groovy-live-server-ppc64el.raw'
Media current: stdio file, overwriteable
Media status : is blank
Media summary: 0 sessions, 0 data blocks, 0 data, 263g free
xorriso : WARNING : -volid text problematic as automatic mount point name
xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
xorriso : FAILURE : -as mkisofs: Unsupported option '--netatalk'
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
Makefile:1063: recipe for target 'bin-images' failed
make: *** [bin-images] Error 5
ERROR WHILE BUILDING OFFICIAL IMAGES !!

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xorriso doesn't seem to support the --netatalk option in mkisofs emulation mode. This is still true with the version of xorriso in Groovy. I had a look in the upstream git repos and support doesn't seem to be implemented.

I found this old thread:

https://lists.debian.org/debian-live/2012/12/msg00130.html

where upstream says implementing --netatalk support is in the todo list, but I can't tell if any progress was actually made.

[Paride Legovini (paride)]

And it seems that genisoimage still doesn't support generating images in isohybrid mode, so we need to keep using both the tools I think. Unless we generate all the ISOs with genisoimage (aka mkisofs) and then convert the amd64 ones to isohybrid using isohybrid(1) from syslinux-utils...

[Dimitri John Ledkov (xnox)]

The plan is to switch to xorriso for all architectures, and to only use grub2 without syslinux for all variants of booting.

[Paride Legovini (paride)]

Fixed by:

https://bazaar.launchpad.net/~ubuntu-cdimage/debian-cd/ubuntu/revision/2066