Re: [PATCH v2] gc: use temporary file for editing crontab

[Derrick Stolee <derrickstolee@github.com>]

On 8/28/2022 5:41 PM, brian m. carlson wrote:
> While cron is specified by POSIX, there are a wide variety of
> implementations in use.  On FreeBSD, the cron implementation requires a
> file name argument: if the user wants to edit standard input, they must
> specify "-".  However, this notation is not specified by POSIX, allowing
> the possibility that making such a change may break other, less common
> implementations.
> 
> Since POSIX tells us that cron must accept a file name argument, let's
> solve this problem by specifying a temporary file instead.  This will
> ensure that we work with the vast majority of implementations.
> 
> Note that because delete_tempfile closes the file for us, we should not
> call fclose here on the handle, since doing so will introduce a double
> free.
> 
> Reported-by: Renato Botelho <garga@FreeBSD.org>
> Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
> ---
> Changes from v1:
> 
> * Use `goto out;` in additional places.
> * Fix broken test.
> * Use `delete_tempfile`.
> * Improve commit message to mention `fclose` rationale.

Thanks for this update. It resolves all of my concerns from v1.

Thanks,
-Stolee