Re: [PATCH 03/14] copy_fd: pass error message back through a strbuf

> This way, callers can put the message in context or even avoid
> printing the message altogether.
>
> Currently hold_lock_file_for_append tries to save errno in order to
> produce a meaningful message about the failure and tries to print a
> second message using errno.  Unfortunately the errno it uses is not
> meaningful because copy_fd makes no effort to set a meaningful errno
> value.  This change is preparation for simplifying the
> hold_lock_file_for_append behavior.
>
> No user-visible change intended yet.
>
> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
> ---
> The title feature.