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bug#36598: 26.1; (error "‘/tmp/emacs1000’ is not a safe directory becaus

From: phillip . lord
Subject: bug#36598: 26.1; (error "‘/tmp/emacs1000’ is not a safe directory because it is a symlink")
Date: Sun, 14 Jul 2019 20:11:31 +0100
User-agent: Roundcube Webmail/1.3.8

On 2019-07-14 12:44, Lars Ingebrigtsen wrote:
address@hidden writes:

On 2019-07-13 15:45, Lars Ingebrigtsen wrote:
address@hidden writes:

Launch emacs-27, start the server. Now launch emacs-26 and start the
server with a different. The problem is that
emacs-27 creates the file /tmp/emacs($PID) as a symlink, while
emacs-26 doesn't like it.

Probably created by

b663c837249 (Stefan Monnier          2019-05-03  538)

Could you post a backtrace for the "doesn't like it" case?

Sure. It is Emacs-26 that errors.

As far as I can see, this will only affect the edge case of someone
running two versions of Emacs. I tend to do this (I run gnus in a
standalone release emacs, and everything else in another emacs).

Commit b663c837249 (in May) which says "Cosmetic changes" is the one
that introduced this code?

    (let ((olddir (or (getenv "TMPDIR") "/tmp")))
(when (and (equal dir (format "%s/emacs" (getenv "XDG_RUNTIME_DIR")))
                 (file-writable-p olddir))
        (let ((link (format "%s/emacs%d" olddir (user-uid))))
          (unless (file-directory-p link)
;; We're using the new location, so try and setup a symlink from ;; the old location, in case we want to use an old emacsclient.
            ;; FIXME: Check that it's safe to use!
            (make-symbolic-link dir link t)))))

And instead of making things work with an old emacsclient, it breaks the
Emacs 26 emacsclient?

Nearly. I think it breaks emacs-26 not the emacsclient. I haven't check the emacsclient code, but I guess Stefan was aiming for the situation when someone is using (say) emacsclient-26 with emacs-27.

This is all a bit of a guess, though.

I may be reading the region history wrong, though.

Stefan, was this checked in by mistake?

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