Arch Linux

Is there any particular reason why aufs is compiled together with the kernel? It is easy enough to compile it separately as a package, which would allow updates and configuration changes to be done more easily. You just have to apply the aufs2-standalone.patch to the kernel sources.

Also the latest version includes some bug-fixes, including to handling of the configuration options. For example in the present Arch configuration there is AUFS_INO_T_64 set to 'y' even on the 32-bit version, which will fail with the new aufs version because it is now recognized properly.

My specific interest is in having the new SHWH option enabled, but if you don't want that for some reason it would be easy enough for me to compile my own aufs package, so long as it is separated out from the kernel package.

Anyway, here is a sketch of how I have built an aufs package.

1) Get aufs standalone code:
#!/bin/sh

git clone http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-standalone.git aufs2-standalone.git
cd aufs2-standalone.git
git checkout origin/aufs2-29 # for instance, aufs2-27 for linux-2.6.27
# aufs2 (no -xx) for the latest -rc version.

#*** apply "aufs2-standalone.patch" to your kernel source files.

rm -rf aufs2-2.6.29_20090601
cp -a aufs2-standalone.git aufs2-2.6.29_20090601
tar -czf aufs2/aufs2-2.6.29_20090601.tar.gz --exclude=.git aufs2-2.6.29_20090601


2) PKGBUILD
pkgname=aufs2
pkgver=2.6.29_20090601
pkgrel=1
_kernver=${pkgver%_*}-ARCH
pkgdesc="Another Unionfs Implementation"
arch=('i686' 'x86_64')
url="http://aufs.sourceforge.net/"
license=('GPL2')
depends=('kernel26>=2.6.29' 'kernel26<2.6.30' 'aufs2-util')
install=${pkgname}.install
source=(${pkgname}-${pkgver}.tar.gz)

build() {
cd ${srcdir}/${pkgname}-${pkgver} || return 1

sed -i 's|CONFIG_AUFS_DEBUG =.*|CONFIG_AUFS_DEBUG =|' \
config.mk || return 1

sed -i 's|CONFIG_AUFS_BDEV_LOOP =.*|CONFIG_AUFS_BDEV_LOOP = y|' \
config.mk || return 1

if [ "${CARCH}" = "x86_64" ]; then
inot64=" y"
else
inot64=""
fi
sed -i "s|CONFIG_AUFS_INO_T_64 =.*|CONFIG_AUFS_INO_T_64 =${inot64}|" \
config.mk || return 1

sed -i 's|CONFIG_AUFS_EXPORT =.*|CONFIG_AUFS_EXPORT = y|' \
config.mk || return 1

sed -i 's|CONFIG_AUFS_SHWH =.*|CONFIG_AUFS_SHWH = y|' \
config.mk || return 1

# build

make KDIR=/usr/src/linux-${_kernver} || return 1

# install
install -D -m644 fs/aufs/aufs.ko \
$startdir/pkg/lib/modules/${_kernver}/kernel/fs/aufs/aufs.ko || return 1

# tweak the install script for the right kernel version
sed -i -e "s/KERNEL_VERSION=.*/KERNEL_VERSION=${_kernver}/g" \
$startdir/$pkgname.install || return 1
}


Alright, I see I've got $startdir there - but that can be changed!