def runCmd()

in testsuite/driver/testlib.py [0:0]

• 38 lines of code
• 15 McCabe index (conditional complexity)

def runCmd(cmd, stdin=None, stdout=None, stderr=None, timeout_multiplier=1.0, print_output=False):
    timeout_prog = strip_quotes(config.timeout_prog)
    timeout = str(int(ceil(config.timeout * timeout_multiplier)))

    # Format cmd using config. Example: cmd='{hpc} report A.tix'
    cmd = cmd.format(**config.__dict__)
    if_verbose(3, cmd + ('< ' + os.path.basename(stdin) if stdin else ''))

    stdin_file = io.open(stdin, 'rb') if stdin else None
    stdout_buffer = b''
    stderr_buffer = b''

    hStdErr = subprocess.PIPE
    if stderr is subprocess.STDOUT:
        hStdErr = subprocess.STDOUT

    try:
        # cmd is a complex command in Bourne-shell syntax
        # e.g (cd . && 'C:/users/simonpj/HEAD/inplace/bin/ghc-stage2' ...etc)
        # Hence it must ultimately be run by a Bourne shell. It's timeout's job
        # to invoke the Bourne shell

        r = subprocess.Popen([timeout_prog, timeout, cmd],
                             stdin=stdin_file,
                             stdout=subprocess.PIPE,
                             stderr=hStdErr,
                             env=ghc_env)

        stdout_buffer, stderr_buffer = r.communicate()
    finally:
        if stdin_file:
            stdin_file.close()
        if config.verbose >= 1 and print_output:
            if stdout_buffer:
                sys.stdout.buffer.write(stdout_buffer)
            if stderr_buffer:
                sys.stderr.buffer.write(stderr_buffer)

        if stdout:
            with io.open(stdout, 'wb') as f:
                f.write(stdout_buffer)
        if stderr:
            if stderr is not subprocess.STDOUT:
                with io.open(stderr, 'wb') as f:
                    f.write(stderr_buffer)

    if r.returncode == 98:
        # The python timeout program uses 98 to signal that ^C was pressed
        stopNow()
    if r.returncode == 99 and getTestOpts().exit_code != 99:
        # Only print a message when timeout killed the process unexpectedly.
        if_verbose(1, 'Timeout happened...killed process "{0}"...\n'.format(cmd))
    return r.returncode