#!/bin/bash

if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

# NOTE(vponomaryov): this approach of ZFS installation is valid for
# Ubuntu 14.04 (Trusty) and is very likely to be different for other releases.
# Also, ZFS should be installed in 'post-install.d' section because its
# dependency 'dkms' is installed in 'install.d/99-dkms'.

# Presence of 'ARCH' env var blocks DKMS from building new dynamic kernel
# modules. So, unset it temporary.
ARCH_BACKUP=$ARCH
unset ARCH

# Install 'software-properties-common' to get 'apt-add-repository' installed
apt-get install -y software-properties-common

# Register ZFS private package archive
apt-add-repository --yes ppa:zfs-native/stable

# Update list of available packages and then upgrade
apt-get -y -q update && apt-get -y -q upgrade

# 'linux-headers-*' should be installed prior to any dynamic kernel modules,
# which are 'zfs' and its dependency 'spl'.
# Same about 'build-essential', that is required for package compilations.
apt-get install -y linux-headers-generic
apt-get install -y build-essential

# Install ZFS for Ubuntu
apt-get install -y ubuntu-zfs

echo """
# Expected following template:
# %module-name%, %module-version%, %kernel-version%, %arch%: installed
#
# examples:
# spl, 0.6.5.4, 3.13.0-76-generic, x86_64: installed
# zfs, 0.6.5.4, 3.13.0-76-generic, x86_64: installed
#
# If it looks like following:
# spl, x.y.z, added
# zfs, x.y.z, added
#
# then something went wrong.
#
# List of dynamic kernel modules:
"""
dkms status

# Return back env var changes
export ARCH=$ARCH_BACKUP
unset ARCH_BACKUP