$err = wfShellExecWithStderr( $cmd, $retval, $env );
wfProfileOut( 'jpegtran' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
$err = wfShellExecWithStderr( $cmd, $retval, $env );
wfProfileOut( 'jpegtran' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );