#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Elixir functions
#
# There's a problem with installing this onto mesh images, which is
# that qemu appears to run out of RAM when using yarn to add webpack.
#
# License
# =======
#
# Copyright (C) 2018 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

erlang_package='erlang-solutions_1.0_all.deb'

function remove_elixir {
    apt-get -yq remove elixir erlang-xmerl erlang-dev erlang-parsetools
    apt-get -yq remove esl-erlang
}

function install_elixir {
    if [ -f /usr/local/bin/mix ]; then
        return
    fi

    apt-get -yq install wget build-essential

    if [ ! -d "$INSTALL_DIR" ]; then
        mkdir -p "$INSTALL_DIR"
    fi

    cd "$INSTALL_DIR" || exit 768345274
    wget https://packages.erlang-solutions.com/$erlang_package
    if [ ! -f "$INSTALL_DIR/$erlang_package" ]; then
        exit 72853
    fi
    dpkg -i $erlang_package
    apt-get -yq update
    apt-get -yq install esl-erlang
    apt-get -yq install elixir erlang-xmerl erlang-dev erlang-parsetools

    if [ ! -f /usr/local/bin/mix ]; then
        echo $'/usr/local/bin/mix not found after elixir installation'
        exit 629352
    fi
}

function image_install_elixir {
    if [[ $VARIANT == "mesh"* ]]; then
        return
    fi

    # shellcheck disable=SC2154
    chroot "$rootdir" apt-get -yq install wget build-essential

    if [ ! -d "$rootdir$INSTALL_DIR" ]; then
        mkdir -p "$rootdir$INSTALL_DIR"
    fi

    { echo '#!/bin/bash';
      echo "cd $INSTALL_DIR || exit 1";
      echo "erlang_package=$erlang_package";
      echo "wget https://packages.erlang-solutions.com/\$erlang_package";
      echo "if [ ! -f \"$INSTALL_DIR/\$erlang_package\" ]; then";
      echo '    exit 2';
      echo 'fi';
      echo "dpkg -i \$erlang_package"; } > "$rootdir/usr/bin/install_elixir"
    chmod +x "$rootdir/usr/bin/install_elixir"
    chroot "$rootdir" /usr/bin/install_elixir
    chroot "$rootdir" apt-get -yq update
    chroot "$rootdir" apt-get -yq install esl-erlang
    chroot "$rootdir" apt-get -yq install elixir erlang-xmerl erlang-dev erlang-parsetools

    if [ ! -f "$rootdir/usr/local/bin/mix" ]; then
        echo $'/usr/local/bin/mix not found after elixir installation'
        exit 629352
    fi
}

# NOTE: deliberately no exit 0