cpio notes

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Revision as of 18:16, 26 February 2014 by Root (Talk | contribs) (Extract a Linux kernel)

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Create a cpio archive

Note that archive should be outside of the directory tree that is being archived.

find . | cpio -o > ../archive
find . | cpio --create --format='newc' > ../archive

Create a Linux kernel initrd

An initramfs is a root filesystem embedded into the Linux kernel. It is the successor of initrd.

IMPORTANT: Do not use the '-depth' option with `find`!

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

List the contents of initrd

gunzip --to-stdout /boot/initrd.img-2.6.31-22-server | cpio -t

Extract a Linux kernel

gunzip --to-stdout /boot/initrd.img-2.6.31-22-server | cpio -i -d -H newc --no-absolute-filenames

Also, often see this; although, this does not have newc or no absolute filename support. Probably not necessary for extraction.

cpio -id < initrd