#NEWLINE# def run( self ) : #NEWLINE# #INDENT# '\n        try open dockerfile, output an error if there is one\n        ' #NEWLINE# try : #NEWLINE# #INDENT# return DockerfileParser ( self . workflow . builder . df_path ) . content #NEWLINE# #UNINDENT# except ( IOError , OSError ) as ex : #NEWLINE# #INDENT# return ( "Couldn't retrieve dockerfile: %r" % ex )