grml
Add support of IMG format
This script handle ISOs, but not IMG.
Previous issue was strangely closed by @zeha saying that
Please find some support forum and ask there.
Ask what? I already tested - this software does not handle IMG images.
I'll finally note that Grml releases are provided as ISOs, and not as "IMG" (whatever that might be).
"whatever that might be" - please read https://en.wikipedia.org/wiki/IMG_(file_format), and as it was mentioned in the original issue - you can find an example here https://github.com/debootdevs/deboot/releases/tag/0.2.0
and
https://cdimage.ubuntu.com/releases/jammy/release
Grml can be provided in ISO or another form, this issue is about be able to boot an IMG.
Grml can be provided in ISO or another form, this issue is about be able to boot an IMG.
You seem to be misunderstanding what grml-rescueboot is about.
Quoting from https://github.com/grml/grml-rescueboot/tree/master/debian:
Usually systems are rescued with CD or USB stick. grml-rescueboot makes it possible to simply copy an Grml ISO image to the harddisk and boot the rescue image. This eliminates the need to carry around a USB stick to rescue a system as long as the hard disk and the boot manager still work.
grml-rescueboot includes the script 42_grml which is installed in /etc/grub.d and run when update-grub is executed. The script looks for ISO images in /boot/grml/ and adds an entry for each image found.
We care about our Grml ISO files (which are also dd-able to devices).
We (as in the Grml project where you're reporting your issue) don't have nor provide any img files .
I also don't know whether such a Ubuntu img file could even be loaded by GRUB and whether those Ubuntu or deboot img files include the GRUB loopback.cfg configuration file (see https://supergrubdisk.org/wiki/Loopback.cfg) which is essential for booting via grml-rescueboot / GRUB.
Put in other words: 1) you need to figure out whether GRUB supports booting / chainloading img files, 2) those img files provide the loopback.cfg configuration file. If both are given, we could technically add support for those within grml-rescueboot.
- you need to figure out whether GRUB supports booting / chainloading img files,
I was able to dd boot.img to USB and boot from it
- those img files provide the loopback.cfg configuration file.
According to my research, the same as with ISO - loopback.cfg may or may not be present.
Another project that provides not ISO but IMG https://tails.net/install/download/index.en.html
Just for your information - useful property of IMG - it can be writable, ISO is read-only.
On Wikipedia I see
ISO images are another type of optical disc image files, which commonly use the .iso file extension, but sometimes use the .img file extension as well
Non-Grml is probably better served by grub-rescueboot
Is it a project?
Like with this project - I can have multiple local images in grub?