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# Kbuilder

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From ArchWiki

kbuilder is a bash script that allows you to build one of the four officially supported kernels locally with your own optional patches and configuration, under a different package name.

For example, you could fetch the sources of the linux-lts kernel, apply a patch that optimizes the kernel for intel processors, and install that kernel as linux-lts-intel-optimized.

## Installation

The following methods can be used to get kbuilder:

- Install the kbuilderAUR package.
- Install the latest development version from the github repository.

## Building a kernel

To fetch the default vanilla linux kernel sources and build the package with the default name linux-kbuilder-custom:

    $ kbuilder build

Note: The build directory is `~/.kbuilder/cache`.

During the build process, kbuilder will inject a bash shell into the PKGBUILD. The shell will be run right before `build()` is called, allowing you to add any patches or change the kernel config interactively. The build will continue once you exit from the shell.

To install the built packages:

    $ kbuilder install

## Build variables

Although kbuilder does not have a configuration file, you can control the build process with environment variables.

- `KBUILDER_SOURCE_PKG` should be set as 'linux', 'linux-lts', 'linux-zen' or 'linux-hardened'. kbuilder will fetch and build the kernel specified with this variable. Defaults to 'linux'. For more information about the official kernels, see kernel.

Note: Patches that work on one kernel may not necessarily work on another.

- `KBUILDER_PKG_NAME_APPEND` can be set as any string. It will be appended to the end of the kernel version and the kernel package. Defaults to 'kbuilder-custom'.

- `KBUILDER_BUILD_JOBS` should be set as an integer. kbuilder will replace the `make all` line in the PKGBUILD with `make -jX all`, where X is the integer specified.

Example usage:

    $ KBUILDER_BUILD_JOBS=4 KBUILDER_PKG_NAME_APPEND="my-custom-patch" KBUILDER_SOURCE_PKG="linux-zen" kbuilder build

## Hooks

kbuilder looks for hooks in `/etc/kbuilder/hooks/`, and uses run-parts to execute them right before `build()` is called. The run-parts command is executed with the flag `--regex "kbuilder-hook-*"`.

An example hook:

    /etc/kbuilder/hooks/05-kbuilder-hook-cpu-optimize.sh

    #!/bin/bash
    #
    # kbuilder hook for applying graysky2's kernel compiler patch:
    # https://github.com/graysky2/kernel_compiler_patch
    #

    SOURCE="https://raw.githubusercontent.com/graysky2/kernel_compiler_patch/master"
    PATCH="more-uarches-for-kernel-5.17+.patch"
    HOOK_NAME="cpu-optimize-hook"

    curl -o $PATCH $SOURCE/$PATCH || { echo "$HOOK_NAME failed when fetching $PATCH from $SOURCE" ; exit 1 ; }
    patch -Np1 -i "$PATCH" || { echo "$HOOK_NAME failed when applying $PATCH" ; exit 1 ; }

To create a hook, create and make executable a file, with a name following the `xx-kbuilder-hook-hookname` form: they will be run in order according to the xx value.

## See also

- Kernel
- The Linux Kernel Documentation
- Applying Patches To The Linux Kernel

Category:

- Kernel