Hello! Chris Marusich <cmmarus...@gmail.com> skribis:
> Chris Marusich <cmmarus...@gmail.com> writes: > >> l...@gnu.org (Ludovic Courtès) writes: >> >>>> There appear to be (at least) two problem that prevent this naive >>>> solution from working, which might point us in the right direction: >>>> >>>> First, the GRUB menu is trying to find a file system with label >>>> "gnu-disk-image" (via "search --label --set gnu-disk-image"), which >>>> won't work because there is no file system with that label in the >>>> resulting image. >>> >>> So it seems that the crux of the problem is that ISO9660 lacks file >>> system labels, which breaks the whole thing, right? >> >> Yes, probably. It seems we can set a "volume id", but not a label like >> in EXT file systems. For example, see here: >> >> https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/cd-dvd/iso-image.nix > > I discovered that grub-mkrescue also lets you pass through options to > xorriso. So, you can set the volume ID as follows: > > $ sudo grub-mkrescue -V gnu-disk-image -v -o /tmp/test-img.iso > /mnt/disk-image-partition-1 > ... > grub-mkrescue: info: enabling BIOS support .... > grub-mkrescue: info: grub-mkimage --directory > '/gnu/store/2hxz9cpipsbf2hkiz5aq70k73wjj0fw1-grub-2.02rc1/lib/grub/i386-pc' > --prefix '/boot/grub' --output > '/tmp/grub.zilpbK/boot/grub/i386-pc/eltorito.img' --format 'i386-pc-eltorito' > --compression 'auto' --config '/tmp/grub.N4OuA5' 'biosdisk' 'iso9660' > ... > grub-mkrescue: info: executing xorriso -as mkisofs -graft-points > --modification-date=2017042404413800 -b boot/grub/i386-pc/eltorito.img > -no-emul-boot -boot-load-size 4 -boot-info-table --grub2-boot-info > --grub2-mbr > /gnu/store/2hxz9cpipsbf2hkiz5aq70k73wjj0fw1-grub-2.02rc1/lib/grub/i386-pc/boot_hybrid.img > --protective-msdos-label -o /tmp/test-img.iso -r /tmp/grub.zilpbK > --sort-weight 0 / --sort-weight 1 /boot -V gnu-disk-image > /mnt/disk-image-partition-1. > ... > xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules > ... > Writing to 'stdio:/tmp/test-img.iso' completed successfully. > > > Looks like setting the volume ID worked (despite the warning above): > > $ sudo blkid /tmp/test-img.iso > /tmp/test-img.iso: UUID="2017-04-24-04-41-38-00" LABEL="gnu-disk-image" > TYPE="iso9660" PTTYPE="dos" Excellent. So we would first need to add support for reading ISO9660 labels in (gnu build file-systems), which is what we use instead of libblkid. With that in place, we should be almost done. Ludo’.