#!/bin/sh
# This script creates a Debian package. When run by `./mk`, it
# is run inside a debian:stable container. It's fine to also
# run this script from any debian-like system, as long as the
# following ASSUMPTIONS are met:
#
# 1. the `ooniprobe` we are packaging is available at
# this path `./CLI/linux/$GOARCH/ooniprobe`;
#
# 2. we are running on a debian system that has the same
# architecture of the `ooniprobe` we are packaging.

if [ $# -gt 1 ]; then
	echo "usage: $0 [run_number]" 1>&2
	exit 1
fi
run_number=$1

# Copy the target binary in the correct location expected
# by the debian/ooniprobe-cli.install file.
rm -rf ./debian/bin
mkdir -p ./debian/bin
machine=$(uname -m)
goarch=""
case $machine in
x86_64)
	cp ./CLI/linux/amd64/ooniprobe ./debian/bin
	goarch=amd64
	;;
aarch64)
	cp ./CLI/linux/arm64/ooniprobe ./debian/bin
	goarch=arm64
	;;
*)
	# TODO(bassosimone): here we probably want to further extend
	# this script to support at least armv7.
	echo "FATAL: unsupported machine: $machine" 1>&2
	exit 1
	;;
esac

set -ex

# figure out the version number from the binary itself (which rests
# on the assumption that we can run such a binary)
version=$(./debian/bin/ooniprobe version)
if [ -n "$run_number" ]; then
	version="${version}~${run_number}"
fi

# The OONI_DEB_DRY_RUN is a semi-undocumented feature allowing
# us to see the commands that would be run by this script.

# install the dependencies required by the build process
$OONI_DEB_DRY_RUN apt-get update -q
$OONI_DEB_DRY_RUN apt-get build-dep -y --no-install-recommends .

# keep the original changelog file safe
$OONI_DEB_DRY_RUN cp ./debian/changelog ./debian/changelog.oocopy

$OONI_DEB_DRY_RUN dch -v "$version" "New version ${version}"
$OONI_DEB_DRY_RUN dpkg-buildpackage -us -uc -b

# restore the original changelog file
$OONI_DEB_DRY_RUN mv ./debian/changelog.oocopy ./debian/changelog

# move the package so that we don't loose track
# of it when using a build container
$OONI_DEB_DRY_RUN mv ../*.deb .

# install the package on the container as a smoke test to
# ensure that it is installable.
DEBIAN_FRONTEND=noninteractive dpkg -i "ooniprobe-cli_${version}_${goarch}.deb"