ruby_version_check.rb

#!/usr/bin/env ruby
#
# Copyright (C) 2017 Harald Sitter <sitter@kde.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) version 3, or any
# later version accepted by the membership of KDE e.V. (or its
# successor approved by the membership of KDE e.V.), which shall
# act as a proxy defined in Section 6 of version 3 of the license.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library.  If not, see <http://www.gnu.org/licenses/>.

require 'yaml'

target = YAML.load_file('ruby_version.yaml')
constraint = ">= #{target}"

if Gem::Dependency.new('', constraint).match?('', RUBY_VERSION)
  puts "Ruby version looks good enough (got #{RUBY_VERSION}, wanted #{target})."
  exit 0
end

warn "Ruby version not sufficient (got #{RUBY_VERSION}, wanted #{target})!"
exit 1