Adding an ISO to grub

[oshunluvr]

Work on your script-foo and make it work for either.

Here, I'll get you started:

if [[ -f initrd.lz

[Don B. Cilly]

So what.. I extract initrd* from the ISO and parse it?

[Don B. Cilly]

No eh?

Anyway, I've added a big fat warning popup to cover that:

[oshunluvr]

[FONT=monospace][COLOR=#54FF54][B]stuart@office[/B][/COLOR][COLOR=#000000]:[/COLOR][COLOR=#54FFFF][B]/subvol/@grub[/B][/COLOR][COLOR=#000000]$ isoinfo -l -i focal-desktop-amd64.iso |grep -i initrd[/COLOR]
----------   0    0    0        86500898 Apr 13 2020 [ 878291 00]  [COLOR=#FF5454][B]INITRD[/B][/COLOR][COLOR=#000000].;1  [/COLOR]
[COLOR=#54FF54][B]stuart@office[/B][/COLOR][COLOR=#000000]:[/COLOR][COLOR=#54FFFF][B]/subvol/@grub[/B][/COLOR][COLOR=#000000]$ isoinfo -l -i neon-useredition-amd64.iso |grep -i initrd                          [/COLOR]
----------   0    0    0        41101734 Apr  9 2020 [ 732392 00]  [COLOR=#FF5454][B]INITRD[/B][/COLOR][COLOR=#000000].LZ;1 [/COLOR]



[/FONT]

[oshunluvr]

NOt pretty, but seems to work:

$ isoinfo -l -i focal-desktop-amd64.iso |grep -i initrd | awk '{ print substr($NF, 1, length($NF)-2)}'
INITRD.

$ isoinfo -l -i neon-useredition-amd64.iso |grep -i initrd | awk '{ print substr($NF, 1, length($NF)-2)}'
INITRD.LZ

[oshunluvr]

BTW, @here df -P does indeed return /dev/nvme0n1p3, etc.

[Don B. Cilly]

NOt pretty, but seems to work:

$ isoinfo -l -i focal-desktop-amd64.iso |grep -i initrd | awk '{ print substr($NF, 1, length($NF)-2)}'
INITRD...

Thanks :·)
No, it's not pretty, because isoinfo converts everything to uppercase ;·) but that should easy to fix - even for me.

BTW, @here df -P does indeed return /dev/nvme0n1p3, etc.

OK, I guess I can also work on accounting for that... hopefully.
If not, I can always - after the required amount of groogling around - ask on a friendly forum we happen to know about, can't I?

[oshunluvr]

If you end up using the awk command, you can just add "tolower" function to it.

isoinfo -l -i neon-useredition-amd64.iso |grep -i initrd | awk '{ print tolower ( substr($NF, 1, length($NF)-2) )}
initrd.lz

[oshunluvr]

I assumed you'd use a bash if in your script so you wouldn't actually need to convert the case, just adjust for it.

[oshunluvr]

Curious as to why the "df -P" using only /dev/sdX9 is an issue?

[oshunluvr]

I see now, the bit in your script. Gotta be another way to get what you're looking for.

Why not just us "df" and the filename:

[FONT=monospace][COLOR=#54FF54][B]stuart@office[/B][/COLOR][COLOR=#000000]:[/COLOR][COLOR=#54FFFF][B]~[/B][/COLOR][COLOR=#000000]$ [/COLOR][/FONT]df --output=source testrun | sed 1d
/dev/nvme0n1p3
[FONT=monospace]
[/FONT]

If your service menu picks up the filename, then send it to the script and use "df", --output=source lists only the device name, then "| sed 1d" strips off the header line.

So this should work:

part=`df --output=source $1 | sed 1d`

[Don B. Cilly]

Thank you. Late here, going to bed. I'll certainly look into it tomorrow

[jlittle]

No, it's not pretty, because isoinfo converts everything to uppercase

You can avoid isoinfo by using the fuseiso package, which lets you do a fuse mount of the iso. F.ex.:

$ mkdir ~/lub
$ fuseiso /t/iso/lubuntu/focal-desktop-amd64.iso lub
$ ls ~/lub/casper
filesystem.manifest         filesystem.squashfs      vmlinuz
filesystem.manifest-remove  filesystem.squashfs.gpg
filesystem.size             initrd
$ fusermount -u ~/lub

(isoinfo looks like a minimal port of a MSDOS utility .)

[Don B. Cilly]

Right, but fuseiso (here) says Command not found, whereas isoinfo doesn't.
So, since I persist in my silly idea that the script could be useful to people who would like to boot and image without external media, and can't be bothered to edit configuration files, work out what hdx,y (/location) their image is, whether their initrd has an lz (for landing choppers? ;·) or not, and so on... chances are that they already have isoinfo. I don't think I installed it... I'm trying to find out if it's a "base" utility... it comes with genisoimage and I don't think I ever heard the name... oh well. We'll see.

Converting to lowercase is easy, anyway :·)

[Don B. Cilly]

So this should work: part=`df --output=source $1 | sed 1d`

But that still returns /dev/sdc2 here. So it would return /dev/nvme0n1p3 there, right?
I did make a bit that would parse /dev/nvme* partitions and convert them to hdx,y grub notation, but then I realised:
1) no-one has read RFC 9999(½) or if they have, they don't care :·)
2) nvme* partitions are for NVMe disks.
3) there's no telling what other mysterious/obnoxious/counterproductive naming schemes (like /dev/mmcblk0 and such) are - or will shortly be - out there.

So there's no way really to convert all possible user's partition names to the grub ones, right?
Or is there?

So, thanks to your suggestion - and assuming that isoinfo is installed in most KDE distros (well, Kubuntu and neon would be good enough, the rest can... ;·) - I can probably limit the warning to a partition-name check (within the script, not as a popup), check that isoinfo is installed, and have the script work for the "masses".