Re: [U-Boot] [PATCH 6/7] tools/genboardscfg.py: check if the boards.cfg is up to date

Hi Simon,

On Wed, 20 Aug 2014 13:13:13 -0600 Simon Glass sjg@chromium.org wrote:

...

+def output_is_new():

• """Check if the boards.cfg file is up to date.
• Returns:

•  True if the boards.cfg file exists and is newer than any of
  

•  *_defconfig, MAINTAINERS and Kconfig*.  False otherwise.
  

• """
• try:

•    ctime = os.path.getctime(BOARD_FILE)
  

• except OSError, exception:

•    if exception.errno == errno.ENOENT:
  

•        # return False on 'No such file or directory' error
  

•        return False
  

•    else:
  

•        raise
  

if not os.path.exists(BOARD_FILE) return False

would probably be enough.

Actually my first code was as follows:

------------>8------------------------ if not os.path.exists(BOARD_FILE) return False

ctime = os.path.getctime(BOARD_FILE) -------------8<----------------------

But what if someone deletes BOARD_FILE between os.path.exists(BOARD_FILE) and os.path.getctime(BOARD_FILE)?

I know it is ridiculous to consider such a rare case.

But I believe it is Python style to follow "try something and then handle an exception" thing.

I am trying to be a bit strict to this rule when invoking OS system calls where there is possibility of failure.

Best Regards Masahiro Yamada