this post was submitted on 01 Mar 2024
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I tried to solve these cross-distro compatibility problems in a generic way with this "standard", more years ago than I'd like to think about:
https://www.supergrubdisk.org/wiki/Loopback.cfg
If someone wants to come up with a bootloader agnostic solution rather than one tied to grub, like an extension to Bootloader spec , https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ , I'd be happy to evangelize it and add support to grub for using it.
I'm not aware of any other bootloader that supports reading a config file that exists within an iso though, and secure boot support may add additional complications.
Bottom line:
I feel like we could relatively easily get to a point where every Live iso that actually supports loop booting can just be added, as a file, to your USB drive (from Windows, or your android phone even) and be detected at boot in a nice little menu, no editing of config files needed.
I don't have the time or spoons to get the Linux community there alone, but if people are interested in helping I'm more than happy to pick this up again.
(Note: Please don't blindly suggest "Just chain load the iso!" Things aren't that easy, unfortunately).