tool-initramfs-extract
Subject
Prepare
grep 'COMPRESS:' /etc/initramfs-tools/initramfs.conf
show
# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]
install (de)compress utils
sudo apt-get install cpio gzip bzip2 xz-utils zstd lz4 lzop
Manual Install
install curl
sudo apt-get install curl
download initramfs-extract to ~/.local/bin/initramfs-extract,
curl -fLo ~/.local/bin/initramfs-extract --create-dirs https://raw.githubusercontent.com/samwhelp/tool-initramfs-extract/main/src/asset/bin/initramfs-extract
chmod 755 ~/.local/bin/initramfs-extract
Usage
Extract /boot/initrd.img
run
initramfs-extract /boot/initrd.img initrd-root
or run
initramfs-extract "/boot/initrd.img-$(uname -r)" initrd-root
unmkinitramfs -v /boot/initrd.img initramfs
unmkinitramfs -v "/boot/initrd.img-$(uname -r)" initramfs
Extract initrd (other compress format)
create new initrd
mkinitramfs -c bzip2 -o initrd.img
then extract
initramfs-extract initrd.img initrd-root
More case
unmkinitramfs -v initrd.img initramfs