#!/bin/bash
set -eu

debsrc_url="https://www.xilinx.com/content/dam/xilinx/publications/solarflare/onload/openonload/8-1-3-40/SF-122451-LS-14-OpenOnload-DEB-Release-Package.zip"
debsrc_folder="onload-8.1.3.40"
build_packages=(
    "debhelper"
    "devscripts"
    "gawk"
    "libcap-dev"
    "libpcap-dev"
    "python3-dev"
)
build_folder="$(mktemp -d)"
build_log="$build_folder/log"

function log() {
    echo "-- $*"
}

function cmd() {
    cmd_redirect="$* 1>> \"$build_log\" 2>&1"
    log "Running: $*"
    eval "$cmd_redirect"
    return $?
}

log "Installing in $build_folder; logs available at $build_log"
log

log "Installing build packages:"
cmd sudo apt update && \
    cmd sudo apt install -y "${build_packages[@]}"
log

debsrc_filename="/tmp/$(basename $debsrc_url)"
log "Retrieving OpenOnload sources:"
cmd wget -NP /tmp "$debsrc_url"
log

log "Unpacking OpenOnload sources:"
cmd pushd "$build_folder" && \
    cmd busybox unzip "$debsrc_filename" && \
    cmd tar xf ./*.tgz && \
    cmd dpkg-source -x ./*.dsc
log

log "Building OpenOnload:"
cmd pushd "$build_folder/$debsrc_folder" && \
    cmd debuild -i -uc -us
log

install_debs=("$build_folder"/*.deb)
log "Installing OpenOnload packages:"
cmd sudo apt install -y "${install_debs[@]}"
log

log "Building OpenOnload kernel modules:"
cmd sudo module-assistant --non-inter auto-install onload && \
    # Not mentioned in the documentation, but:
    # OpenOnload installs a module named sfc.ko, which clashes with
    # the sfc.ko provided by the OS installation.
    # To deal with this, a depmod file is also installed, which should
    # instruct the OS to load OpenOnload's version.
    # However, unless depmod is re-run after installation, OpenOnload will fail
    # to load, citing "symbol not found" errors.
    sudo depmod
log

log "Loading OpenOnload kernel modules:"
cmd sudo onload_tool reload
log

log "Installation complete."