in_tail: Preserve backward compatiblity for glob

This is because square brackets are permitted to use filename in macOS
and Windows.

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

lib/fluent/plugin/in_tail.rb

@@ -64,6 +64,8 @@ def initialize
  config_param :path, :string
  desc 'path delimiter used for spliting path config'
  config_param :path_delimiter, :string, default: ','
+ desc 'Use extended glob patterns. Adding a capability to handle [] and ?.'
+ config_param :use_extended_glob, :bool, default: false
  desc 'The tag of the event.'
  config_param :tag, :string
  desc 'The paths to exclude the files from watcher list.'
@@ -286,7 +288,11 @@ def have_read_capability?
  # Curly braces is not supported for now because the default delimiter of path is ",".
  # This should be collided for wildcard pattern for curly braces.
  def use_glob?(path)
- path.include?('*') || path.include?('?') || /\[.*\]/.match(path)
+ if @use_extended_glob
+ path.include?('*') || path.include?('?') || /\[.*\]/.match(path)
+ else
+ path.include?('*')
+ end
  end
 
  def expand_paths

test/plugin/test_in_tail.rb

@@ -1552,6 +1552,7 @@ def test_expand_paths_with_use_glob_p
  "pos_file" => "#{@tmp_dir}/tail.pos",
  "read_from_head" => true,
  "refresh_interval" => 30,
+ "use_extended_glob" => true,
  "rotate_wait" => "#{EX_ROTATE_WAIT}s",
  "follow_inodes" => "#{EX_FOLLOW_INODES}",
  })