Adding aufs support to Ubuntu LTS 14.04 with 3.16-rc5 kernel

Adding aufs support to 3.16-rc5 is little different than what is was for older kernels. Below works for Ubuntu LTS 14.04.

# Switch to mainline kernel without Ubuntu patches
# We do this so we have "known good" kernel to troubleshoot
# if something goes wrong and also for suitable kernel config file
mkdir -p /opt/src/3.16rc5
cd /opt/src/3.16rc5
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/linux-headers-3.16.0-031600rc5-generic_3.16.0-031600rc5.201407131735_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/linux-headers-3.16.0-031600rc5_3.16.0-031600rc5.201407131735_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/linux-image-3.16.0-031600rc5-generic_3.16.0-031600rc5.201407131735_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/0001-base-packaging.patch
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/0002-debian-changelog.patch
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc5-utopic/0003-configs-based-on-Ubuntu-3.16.0-3.8.patch
dpkg -i linux-*3.16*.deb
 
# Deps for compiling kernel
apt-get update
apt-get -y install git-core kernel-package fakeroot build-essential ncurses-dev
 
# Download aufs, must match with kernel installed
mkdir -p /opt/src/aufs
cd /opt/src/aufs
git clone git://aufs.git.sourceforge.net/gitroot/aufs/aufs3-standalone.git aufs3-standalone.git
cd aufs3-standalone.git
#git checkout origin/aufs3.x-rcN
git checkout 501539c
 
# Get kernel source
mkdir -p /opt/src/3.16rc5aufs
cd /opt/src/3.16rc5aufs
wget https://www.kernel.org/pub/linux/kernel/v3.x/testing/linux-3.16-rc5.tar.gz
 
# Extract and patch with Ubuntu configs
tar xvzf linux-3.16-rc5.tar.gz
cd linux-3.16-rc5
patch -p1 </opt/src/3.16rc5/0001-base-packaging.patch
patch -p1 </opt/src/3.16rc5/0002-debian-changelog.patch
patch -p1 </opt/src/3.16rc5/0003-configs-based-on-Ubuntu-3.16.0-3.8.patch
 
# Apply aufs patches
patch -p1 </opt/src/aufs/aufs3-standalone.git/aufs3-base.patch
patch -p1 </opt/src/aufs/aufs3-standalone.git/aufs3-standalone.patch
patch -p1 </opt/src/aufs/aufs3-standalone.git/aufs3-mmap.patch

# Compile kernel and generate new dpkgs
cp /boot/config-3.16.0-031600rc5-generic .config
make olddefconfig
CONCURRENCY_LEVEL=4 fakeroot make-kpkg --initrd --append-to-version=-aufs kernel_image kernel_headers
 
# Install new kernel
cd ..
dpkg -i linux-headers-3.16.0-rc5-aufs_3.16.0-rc5-aufs-10.00.Custom_amd64.deb \
        linux-image-3.16.0-rc5-aufs_3.16.0-rc5-aufs-10.00.Custom_amd64.deb
 
# Prevent future kernel updates breaking things
echo "linux-image-3.16.0-rc5-aufs hold"             | dpkg --set-selections
echo "linux-headers-3.16.0-rc5-aufs hold"           | dpkg --set-selections
echo "linux-image-3.16.0-031600rc5-generic hold"    | dpkg --set-selections
echo "linux-headers-3.16.0-031600rc5-generic hold"  | dpkg --set-selections
 
# For new Ubuntu versions with silly grub submenu layout
# https://help.ubuntu.com/community/Grub2/Submenus#Setting_a_Submenu_entry_as_the_default
sed -i.bak /etc/default/grub \
    -e's|^GRUB_DEFAULT=.*|GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 3.16.0-rc5-aufs"|g'
 
# and run update-grub
update-grub
 
# Reboot

# Next aufs module
cd /opt/src/aufs/aufs3-standalone.git/
 
# Enable hnotify, allows direct access to branches bypassing aufs
sed -i.bak config.mk \
    -e's|^CONFIG_AUFS_HNOTIFY.*|CONFIG_AUFS_HNOTIFY = y|g' \
    -e's|^CONFIG_AUFS_HFSNOTIFY.*|CONFIG_AUFS_HFSNOTIFY = y|g'
 
# Fix missing binary that prevents compiling aufs
cd /opt/src/3.16rc5aufs/linux-3.16-rc5/scripts/
gcc unifdef.c -o unifdef
cd -
 
# Compile aufs
make
 
# Install aufs
make install
depmod -a
 
# We skip aufs-utils install as they're not needed