Dev1 Galaxy Forum / [SOLVED]How do I unpack our intrd.img

Re: [SOLVED]How do I unpack our intrd.img

dummy@example.com (aus9) — Wed, 22 Apr 2020 01:41:34 +0000

Thanks will check out later

Re: [SOLVED]How do I unpack our intrd.img

dummy@example.com (dgrif) — Tue, 21 Apr 2020 17:59:49 +0000

Almost easier is to use the programs found in the package "initramfs-tools-core". In particular lsinitramfs and unmkinitramfs work really well for me. I build a custom kernel and initramfs to have a router system that runs completely within memory once booted, no disk or usb stick
access.

[SOLVED]How do I unpack our intrd.img

dummy@example.com (aus9) — Mon, 30 Mar 2020 03:21:43 +0000

I want to do some exploring of our initrd.img

I found a simple command that appeared to work but it only unpacks microcode

eg all commands done as root

cp /boot/initrd.img-4.19.0-8-amd64 /tmp
cd /tmp
cpio -i -F initrd.img*
ls -al (culling older timestamps) 
kernel

and the kernel has sub dirs to lead to your amd or intel or both microcodes.

I am aware that we have a file as follows

file initrd.img-4.19.0-8-amd64 
initrd.img-4.19.0-8-amd64: ASCII cpio archive (SVR4 with no CRC)

I found a hit after changing my search to ask why I could only see a kernel got this
https://unix.stackexchange.com/question … ely-kernel

new root commands

mkdir /tmp/unpack
cp /boot/initrd.img-4.19.0-8-amd64 /tmp/unpack
cd /tmp/unpack
(cpio -id; zcat | cpio -id) < initrd.img-4.19.0-8-amd64

ls
bin  conf  cryptroot  etc  init  initrd.img-4.19.0-8-amd64  kernel  lib  lib64	run  sbin  scripts  usr