Method: Chef::Provider::File#diff_current

Defined in:
lib/chef/provider/file.rb

#diff_current(temp_path) ⇒ Object 



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# File 'lib/chef/provider/file.rb', line 70

def diff_current(temp_path)
  suppress_resource_reporting = false

  return [ "(diff output suppressed by config)" ] if Chef::Config[:diff_disabled]
  return [ "(no temp file with new content, diff output suppressed)" ] unless ::File.exists?(temp_path)  # should never happen?

  # solaris does not support diff -N, so create tempfile to diff against if we are creating a new file
  target_path = if ::File.exists?(@current_resource.path)
                  @current_resource.path
                else
                  suppress_resource_reporting = true  # suppress big diffs going to resource reporting service
                  tempfile = Tempfile.new('chef-tempfile')
                  tempfile.path
                end

  diff_filesize_threshold = Chef::Config[:diff_filesize_threshold]
  diff_output_threshold = Chef::Config[:diff_output_threshold]

  if ::File.size(target_path) > diff_filesize_threshold || ::File.size(temp_path) > diff_filesize_threshold
    return [ "(file sizes exceed #{diff_filesize_threshold} bytes, diff output suppressed)" ]
  end

  # MacOSX(BSD?) diff will *sometimes* happily spit out nasty binary diffs
  return [ "(current file is binary, diff output suppressed)"] if is_binary?(target_path)
  return [ "(new content is binary, diff output suppressed)"] if is_binary?(temp_path)

  begin
    # -u: Unified diff format
    result = shell_out("diff -u #{target_path} #{temp_path}" )
  rescue Exception => e
    # Should *not* receive this, but in some circumstances it seems that 
    # an exception can be thrown even using shell_out instead of shell_out!
    return [ "Could not determine diff. Error: #{e.message}" ]
  end

  # diff will set a non-zero return code even when there's 
  # valid stdout results, if it encounters something unexpected
  # So as long as we have output, we'll show it.
  if not result.stdout.empty?
    if result.stdout.length > diff_output_threshold
      [ "(long diff of over #{diff_output_threshold} characters, diff output suppressed)" ]
    else
      val = result.stdout.split("\n")
      val.delete("\\ No newline at end of file")
      @new_resource.diff(val.join("\\n")) unless suppress_resource_reporting
      val
    end
  elsif not result.stderr.empty?
    [ "Could not determine diff. Error: #{result.stderr}" ]
  else
    [ "(no diff)" ]
  end
end