enable-sudo

#!/bin/sh -eu

# enable-sudo: install sudo and add supplemental group sudo
# Copyright (C) 2018  "Michael G. Morey" <mgmorey@gmail.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

DEBIAN_PKGS="sudo"

abort() {
    printf "$@" >&2
    exit 1
}

abort_not_supported() {
    abort '%s: %s: %s not supported\n' "$0" "$PRETTY_NAME" "$*"
}

assert() {
    "$@" || abort '%s: Assertion failed: %s\n' "$0" "$*"
}

eval $(get-os-release -x)

case "$ID" in
    (debian|raspbian|ubuntu)
	su -c "apt-get install $DEBIAN_PKGS"
	;;
    (*)
	abort_not_supported "Operating system"
	;;
esac

if su -c "usermod -a -G sudo $USER"; then
    printf 'Please restart machine before using sudo\n'
fi