On Thu, Jan 14, 2021 at 04:59:08PM +0100, Thomas Schmitt wrote: >Steve McIntyre wrote: >> [Dropping CC to Lou as we've wandered, re-adding Thomas for the GPT >> question.] > >[Lou and i are subscribed to debian-cd, obviously. :)) >It seems you dropped the original poster: The7up <the...@gmail.com> >who might indeed not be interested in partitioning.]
That's what I've assumed... >> For the >> sake of this kind of use-case, is it sensible when driving xorriso to >> tweak the created partition table to list the ESP as partition 1? At >> the moment we're just using "-append_partition 2 0xef >> /path/to/ESP.img", would just changing that to be partition 1 instead >> work? > >That would still work, but leave the ISO fileystem without a partition >entry to mark it. > >The man page of xorrisofs says: > > partition_number may be 1 to 4. Number 1 will put the whole ISO > image into the unclaimed space before partition 1. > >Minimalistic experiment: > > xorriso -as mkisofs -o test.iso /bin/ls -append_partition 1 0xef /bin/cp > >yields (with /bin/ls as ISO payload having ~ 120 KB and /bin/cp as >appended payload having ~150 KB): > > $ sbin/fdisk -l test.iso > ... > Device Boot Start End Sectors Size Id Type > test.iso1 364 659 296 148K ef EFI (FAT-12/16/32) > >-------------------------------------------------------------------------- > >I could tweak libisofs so that the ISO filesystem can appear as partition 2 >but that would be unusual by partition 2 sitting before partition 1. > >On the other hand, there is urgent need for an ISO filesystem partition >only if the reader cannot mount the base device but only its partitions. Cool, thanks for that. In the cases we're looking at, I don't think that we need that partition then. I'll have a play with this and a few other things. -- Steve McIntyre, Cambridge, UK. st...@einval.com "I used to be the first kid on the block wanting a cranial implant, now I want to be the first with a cranial firewall. " -- Charlie Stross
