On Tue, Apr 23, 2019 at 10:18:10PM +0200, Thomas Schmitt wrote: > Florian Pelz wrote: > > florian@florianmacbook ~ [env]$ grub-mkrescue -o output.iso minimal > > --xorriso=./grub-mkrescue-sed.sh > > grub-mkrescue: warning: Your xorriso doesn't support `--grub2-boot-info'. > > Some features are disabled. Please use xorriso 1.2.9 or later.. > > > > and yields no output.iso for me. Note that xorriso actually has > > version 1.5.0. > > Does the script offer x-permission ? > (Shame on me for not thinking of this in my download instructions.) >
This was the error. It works after `chmod +x grub-mkrescue-sed.sh`. On Tue, Apr 23, 2019 at 08:14:48PM +0200, Thomas Schmitt wrote: > It would be interesting to learn about EFIs which fail without MBR > signature. > […] > - Put the resulting output.iso on USB stick and offer it to your firmware > at boot time. > Is it not found by the EFI boot manager ? > If you let it boot, does the machine not show a GRUB prompt in the end ? > It shows up twice in the boot selection screen as “GRUB 2.02” and “EFI Boot” just like the Guix USB drive before. It is bootable and shows a GRUB prompt on my Macbook. > - Negative results with other mode settings in MKRESCUE_SED_MODE would be > interesting, too. > I can try tomorrow. By the way, someone I know has a most peculiar machine called Lenovo Ideapad 100S which does not boot Guix, but apparently is very picky in general (cf. <https://forums.linuxmint.com/viewtopic.php?t=216476>). Its CPU is claimed to support 64-bit, but its boot firmware rejects most 64-bit isos. I wonder if we could get that machine to boot Guix (at least it currently cannot boot guixsd-install-0.15.0.i686-linux.iso), but that may well be a waste of time. It might just not be feasible to please every EFI system. > I wrote: > > > So programs like /sbin/isosize can tell the image size even when the > > > ISO has already been copied to USB stick. > > > Sounds like this could be used to get a checksum or maybe GPG > > verification of a USB drive that supposedly contains the iso. > > That's what this property is advised for in Debian's CD FAQ. > One can read trailing garbage not only from USB sticks but also from > most DVD types. > (The layout with nested partitions obsoletes the cleanliness > considerations about partition start at LBA 0.) > So… GPT is wrong for some optical media too? Regards, Florian
