Does anyone know how I can decompress initrd.img to a directory, make my changes in this directory and then create a new initrd.img with the data in this directory?

i have this here about changing a module
perhaps it is usefull perhaps not.......
i hope it doesn't take you in a wrong direction
i don't use initrd.img so i have never tried to used this
but it does seem to make sense based on what i know about boot image

cp ./initrd.img /tmp/
gzip -dc /tmp/initrd.img > /tmp/initrd.unc.img
mkdir /tmp/imagemount
mount -o loop /tmp/initrd.unc.img /tmp/imagemount
gzip -dc /tmp/imagemount/modules/modules.cgz > /tmp/modules.cpio
mkdir /tmp/modules
cd /tmp/modules
cpio -idumv < ../modules.cpio
cd x.x.xBOOT(whatever the directory is)
rm <whateverModule>
cp /usr/src/linux-x.x/whatever/whatever/<whateverModule> ./<WhateverModule>
cd ..
find . -type f | cpio -ocO /tmp/newmods.cpio
cd ..
gzip -c newmods.cpio > imagemount/modules/modules.cgz
umount /tmp/imagemount
gzip -c initrd.unc.img > initrd.img
cp initrd.img <to wherever it goes>

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