[PATCH] checkstyle: Work around bug in difflib
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Fri Mar 15 13:45:24 CET 2024
Hi Stefan,
Thank you for the patch.
On Thu, Mar 14, 2024 at 11:57:36AM +0100, Stefan Klug wrote:
> If a file misses the newline at the end it gets detected by checkstyle,
> but the resulting patch is incorrect and does not apply. It took me a
> while to understand that it wasn't me using checkstyle incorrectly, but
> that the patch was faulty. The bug itself is in difflib and dates back to
> 2008.
>
> To reproduce:
> - Remove trailing newline from a file
> - git add the file
> - run ./utils/checkstyle.py -s | patch -p0
>
> Signed-off-by: Stefan Klug <stefan.klug at ideasonboard.com>
> ---
> utils/checkstyle.py | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/utils/checkstyle.py b/utils/checkstyle.py
> index db5a550d..20a5a592 100755
> --- a/utils/checkstyle.py
> +++ b/utils/checkstyle.py
> @@ -168,6 +168,12 @@ def parse_diff(diff):
> hunk = DiffHunk(line)
>
> elif hunk is not None:
> + # Work around https://github.com/python/cpython/issues/46395
> + # See https://www.gnu.org/software/diffutils/manual/html_node/Incomplete-Lines.html
> + if line[-1] != '\n':
> + hunk.append(line + '\n')
> + line = "\\ No newline at end of file\n"
s/"/'/g
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> +
> hunk.append(line)
>
> if hunk:
--
Regards,
Laurent Pinchart
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