#linux-kernel #config-file #kernel #linux #config #command-line-tool

app ikconfig

A CLI utility to extract the .config file from a kernel image

9 releases

0.2.0 Feb 12, 2023
0.1.7 Jan 30, 2023
0.1.3 Dec 21, 2022

#108 in #linux-kernel

32 downloads per month

GPL-3.0-or-later OR MIT and GPL-3.0-or-later

30KB
585 lines

ikconfig

This is a Rust re-implementation of extract-ikconfig from Linux kernel, to extract the .config file from a kernel image.

This will only work when the kernel was compiled with CONFIG_IKCONFIG, which is enabled on Arch Linux by default but not on Ubuntu.

It supports all 7 compression algorithms in Linux kernel:

  • CONFIG_KERNEL_GZIP
  • CONFIG_KERNEL_BZIP2
  • CONFIG_KERNEL_LZMA
  • CONFIG_KERNEL_XZ
  • CONFIG_KERNEL_LZO
  • CONFIG_KERNEL_LZ4
  • CONFIG_KERNEL_ZSTD

Prerequisites

This crate requires liblzma being present in the system before installation and pkg-config is used to find liblzma and other libraries during the build.

Arch Linux

sudo pacman -S pkgconf xz

Ubuntu

sudo apt install pkg-config liblzma-dev

Please refer to system manuals for other distributions. You can check if liblzma is installed by running:

$ pkg-config --libs liblzma

And it should output -llzma if liblzma is correctly installed.

Install

This crate has been published onto crates.io, so you can use the following command to install ikconfig executable in ~/.cargo/bin directory:

cargo install ikconfig

Usage

ikconfig <path_of_kernel_image>

The extracted config file will be printed on standard output as the original shell script does. Please use output redirection to save as a file if needed, e.g.:

ikconfig /boot/vmlinuz-linux > .config

Tests

The integration tests in this repository will compare the execution time of ikconfig and extract-ikconfig shell script. The latter uses the commands on system to accomplish corresponding decompression, most of which are pre-installed except lzop(1), so you might need to install it before running cargo test.

Arch Linux

sudo pacman -S lzop

Ubuntu

sudo apt install lzop

License

This project is licensed under GPL-3.0 or MIT license.

Dependencies

~8–19MB
~261K SLoC