Re: [Emacs-diffs] emacs-25 c23c965: Prevent bootstrap autoload backup files

[Stefan Monnier <monnier@IRO.UMontreal.CA>]

>>>>> "Phillip" == Phillip Lord <phillip.lord@russet.org.uk> writes:

> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>> -    (let ((delay-mode-hooks t))
>>> -      (find-file-noselect
>>> -       (autoload-ensure-default-file (autoload-generated-file))))))
>>> +    (let* ((delay-mode-hooks t)
>>> +           (file (autoload-generated-file))
>>> +           (file-missing (not (file-exists-p file))))
>>> +      (when file-missing
>>> +        (autoload-ensure-default-file file))
>>> +      (with-current-buffer
>>> +          (find-file-noselect
>>> +           (autoload-ensure-file-writeable
>>> +            file))
>>> +        ;; block backups when the file has just been created, since
>>> +        ;; the backups will just be the auto-generated headers.
>>> +        ;; bug#23203
>>> +        (when file-missing
>>> +          (setq buffer-backed-up t)
>>> +          (save-buffer))
>>> +        (current-buffer)))))
>> 
>> That looks quite complicated just to suppress backups.
>> Could you explain why we couldn't just do something like:
>> 
>> (let ((delay-mode-hooks t)
>> (make-backup-files))
>> (find-file-noselect
>> (autoload-ensure-default-file (autoload-generated-file))))))
>> or
>> (let ((delay-mode-hooks t))
>> (with-current-buffer
>> (find-file-noselect
>> (autoload-ensure-default-file (autoload-generated-file)))
>> (setq-local backup-inhibited t)))))

> It has different semantics. My patch preserves backup files except when
> the autoload file is created for the first time. This only happens
> because we create the header and footer in one place, then reopen with
> find-file-noselect.

I see.  Yuck!
And thanks for the explanation.


        Stefan