Reduce patching of Debian's live-boot

[zeha]

I've submitted most of the upstream-able delta to https://salsa.debian.org/live-team/live-boot/-/commits/master
The rest should hopefully be extractable into new files, so we can stop patching stuff.

If this succeeds, it should become possible to stop conflicting with live-boot, and unmerge the source trees.

[zeha]

open question: why are these lines deleted?

773bef6#diff-b0f403d00de9e16d2682047173ed4665b9458d7a805cfa8a52e4d0799e3e247fL313-L325

@mika please if you know... :)

[mika]

open question: why are these lines deleted?

773bef6#diff-b0f403d00de9e16d2682047173ed4665b9458d7a805cfa8a52e4d0799e3e247fL313-L325

@mika please if you know... :)

I think it's related to a boot attack vector, that someone could trick the system to boot from something unexpected (relevant esp. for forensics investigations). I'm not sure whether that's still true nowadays, we'd have to very this.

[zeha]

Needs a good test, otherwise done from my PoV.

[mika]

FTR: our Grml_Networking implementation (see components/9990-grml-networking.sh with its usage in components/9990-main.sh as well as the Grml branding in backend/initramfs-tools/live.hook + components/9990-initramfs-tools.sh needs to be ported (or if we decide to drop the Grml networking stuff properly document the relevant changes.