#!/bin/bash

# Build a package for a specific distribution using a Docker image.
#
# ./build DISTRO RELEASE 
#
# From a given DISTRO:RELEASE it create a new local Docker image named
# DISTRO-builder:RELEASE and installs tools required to build a
# package (it does not install package build depends).
#
# It also creates a builder user to prevent from building packages as
# root.
#
# Once the image is setup, it starts a docker image and run
# build-helper to build the packages. The packages files are stored in
# _OUT/DISTRO/RELEASE.
#


vendor="$1"
release="$2"

if test -z "$vendor" -o -z "$release"; then
    cat<<EOF >&2
$0 VENDOR RELEASE
EOF
    exit 1
fi

source_dir=$(git rev-parse --show-toplevel)
output_dir=$source_dir/_out
empty_dir=$output__dir/_empty

if test "$vendor" = "opensuse"; then
    vendor=opensuse/leap
    pkg_dir=$output_dir/$vendor-$release
else
    pkg_dir=$output_dir/$vendor/$release
fi

image=$vendor-builder:$release

mkdir -p $pkg_dir
mkdir -p $output_dir/_empty

# Build docker image
docker build -t $image -f packages/Dockerfile \
       --build-arg vendor="$vendor" \
       --build-arg release="$release" \
       .

docker_args="-v $source_dir:/source-ro:ro -v $empty_dir:/source-ro/_out:ro"
docker_args="$docker_args -v $pkg_dir:/output:rw"
docker_args="$docker_args -v $source_dir/packages/build-helper:/build-helper"
docker_args="$docker_args --rm"

docker run -it $docker_args $image /build-helper