fluent/fluentd

#
# Fluentd
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#

module Fluent
  module Compat
    module FileUtil
      # Check file is writable if file exists
      # Check directory is writable if file does not exist
      #
      # @param [String] path File path
      # @return [Boolean] file is writable or not
      def writable?(path)
        return false if File.directory?(path)
        return File.writable?(path) if File.exist?(path)

        dirname = File.dirname(path)
        return false if !File.directory?(dirname)
        File.writable?(dirname)
      end
      module_function :writable?

      # Check file is writable in conjunction with mkdir_p(dirname(path))
      #
      # @param [String] path File path
      # @return [Boolean] file writable or not
      def writable_p?(path)
        return false if File.directory?(path)
        return File.writable?(path) if File.exist?(path)

        dirname = File.dirname(path)
        until File.exist?(dirname)
          dirname = File.dirname(dirname)
        end

        return false if !File.directory?(dirname)
        File.writable?(dirname)
      end
      module_function :writable_p?
    end
  end
end