A PKGBUILD that helps you compile kernel from local source tree

xedchou · 2014-12-23 10:06:56

I don't know if someone did this beofore. Hours ago I wrote a PKGBUILD file for compiling kernel,
it is different than the one from abs. It allows you

compile a kernel from a exiting kernel source tree and leave it clean.
honor the Archway, this means you have a clean filesystem

It is acutally because I'm currently playing with The Eudyptula Challenge.
and I'm tied our compress/decompress a kernel tree all the time. If you are kernel developer, you
may also find it useful.

The PKGBUILD file worked on my machine, I will add headers and docs later.

Oh, almost forgot: here is my PKGBUILD:

#So we will have a clean src tree
pkgbase=linux-test
_kernel_bin=kernel_build
#the variable you have to provide
_builddir=kernel_build
kernel_src_dir='/home/developer/Courses/kernel-base'
_srcname=kernel_tree
#end the variable you have to provide
pkgver=3.8.1
pkgrel=1
pkgdesc="The Linux kernel and modules"
depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc')
optdepends=('crda: to set the correct wireless channels of your country')
provides=("kernel26${_kernelname}=${pkgver}")
conflicts=("kernel26${_kernelname}")
replaces=("kernel26${_kernelname}")
arch=('i686' 'x86_64')
url="http://www.kernel.org/"
license=('GPL2')
source=(#if we provide this, means kernel compile progress is already done
"${_kernel_bin}.tar.xz"
'linux.preset'
)
sha256sums=('65847bc847344434657db729d2dde4a408e303ea29ae1409520cecee8da6fc3d'
'2c2e8428e2281babcaf542e246c2b63dea599abb7ae086fa482081580f108a98')
#this one strip the linux off
_kernelname=${pkgbase#linux}
prepare() {
#XXX:checked
#build dir has to be the same as kernel_bin files, then builddir is created
#automatically by tar
if [ "${kernel_src_dir}" == "" ];then
return 1
fi
#provide kernel source tree for compile and move modules
ln -s ${kernel_src_dir} ${srcdir}/${_srcname}
mkdir -p "${srcdir}/${_srcname}"
#we need to check here if there exist kernel bin files
if [ "${_kernel_bin}" == "" ]; then
make O="${srcdir}/${_builddir}" menuconfig
fi
}
build() {
#XXX:checked
cd "${srcdir}/${_srcname}"
#we need to check here if there exist kernel bin files
if [ "${_kernel_bin}" == "" ]; then
#return 1
make O="${srcdir}/${_builddir}" bzImage modules
fi
#otherwise this step is done already done
}
_package() {
#we dont need to worry about mkinitcpio, depmod thing, They are done by
#install script, we need to provide a preset and install file instead.
#we build kernel objs on _builddir, and install them in pkgdir
#install binary files, this means we have a compiled binary tree
cd "${srcdir}/${_srcname}"
#echo "$(pwd)"
KARCH=x86
install=linux.install
# get kernel version
_kernver="$(make O="${srcdir}/${_builddir}" kernelrelease)"
_kernver=$(echo "${_kernver}" | sed -n 2p -)
#strip the -dirty away
_kernver=${_kernver%-*}	
_basekernel=${_kernver%%-*}
_basekernel=${_basekernel%.*}
mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
make O="${srcdir}/${_builddir}" INSTALL_MOD_PATH="${pkgdir}" modules_install
cp "${srcdir}/${_builddir}"/arch/$KARCH/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"
# set correct depmod command for install
cp -f "${startdir}/${install}" "${startdir}/${install}.pkg"
true && install=${install}.pkg
sed -e "s/KERNEL_NAME=.*/KERNEL_NAME=${_kernelname}/" -i "${startdir}/${install}"
sed "s/KERNEL_VERSION=.*/KERNEL_VERSION=${_kernver}/" -i "${startdir}/${install}"
# install mkinitcpio preset file for kernel
install -D -m644 "${srcdir}/linux.preset" "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
sed \
-e "1s|'linux.*'|'${pkgbase}'|" \
-e "s|ALL_kver=.*|ALL_kver=\"/boot/vmlinuz-${pkgbase}\"|" \
-e "s|default_image=.*|default_image=\"/boot/initramfs-${pkgbase}.img\"|" \
-i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
# remove build and source links
rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
# remove the firmware
rm -rf "${pkgdir}/lib/firmware"
# gzip -9 all modules to save 100MB of space
find "${pkgdir}" -name '*.ko' -exec gzip -9 {} \;
# make room for external modules
ln -s "../extramodules-${_basekernel}${_kernelname:--ARCH}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
# add real version for building modules and running depmod from post_install/upgrade
mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}"
echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}/version"
# Now we call depmod...
#echo "Call Depmod"
cp "${srcdir}/${_builddir}/System.map" System.map
depmod -b "${pkgdir}" -F System.map "${_kernver}"
#echo "Called Depmod"
# move module tree /lib -> /usr/lib
mkdir -p "${pkgdir}/usr"
mv "${pkgdir}/lib" "${pkgdir}/usr/"
# add vmlinux
install -D -m644 "${srcdir}/${_builddir}/"vmlinux "${pkgdir}/usr/lib/modules/${_kernver}/build/vmlinux"
}
pkgname=("${pkgbase}")
for _p in ${pkgname[@]}; do
eval "package_${_p}() {
_package${_p#${pkgbase}}
}"
done

and here is the address of it on github

Last edited by xedchou (2014-12-23 12:41:55)

Trilby · 2014-12-23 12:32:42

Based on the title alone I almost reflexively binned this thread. Please rename this thread to *something* relating to what you're actually posting.

jasonwryan · 2014-12-23 18:44:23

Moving to Creating and Modifying Packages...

Arch Linux

#1 2014-12-23 10:06:56

A PKGBUILD that helps you compile kernel from local source tree

#2 2014-12-23 12:32:42

Re: A PKGBUILD that helps you compile kernel from local source tree

#3 2014-12-23 18:44:23

Re: A PKGBUILD that helps you compile kernel from local source tree

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