/usr/lib/ruby/vendor_ruby/rails/rack/log_tailer.rb is in ruby-railties 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | require 'active_support/deprecation'
module Rails
module Rack
class LogTailer
def initialize(app, log = nil)
ActiveSupport::Deprecation.warn('LogTailer is deprecated and will be removed on Rails 5.')
@app = app
path = Pathname.new(log || "#{::File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath
@cursor = @file = nil
if ::File.exist?(path)
@cursor = ::File.size(path)
@file = ::File.open(path, 'r')
end
end
def call(env)
response = @app.call(env)
tail!
response
end
def tail!
return unless @cursor
@file.seek @cursor
unless @file.eof?
contents = @file.read
@cursor = @file.tell
$stdout.print contents
end
end
end
end
end
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