moggen.org

Modifying an initrd file system

I needed to do this recently.

To unpack:

mkdir root
sudo chown root:root root
sudo chmod 775 root
cd root
zcat ../initrd.gz|sudo cpio -id

Do the alterations

To repack into a new image, current directory at root/:

find ./ | sudo cpio -H newc -o | gzip >../newinitrd.gz