bug#59545: 29.0.50; Eshell fails to redirect output of sourced eshell file

[Jim Porter <jporterbugs@gmail.com>]

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On 12/20/2022 4:18 PM, Jim Porter wrote:
> Attached is a patch series to fix this, with a bunch of new tests. I 
> also fixed a related issue where redirecting to /dev/null could clobber 
> your other redirects. (There's *also* an issue that should be fixed for 
> the release branch; I'll send that in a separate message.)

Eli, this is the patch for the release branch (it corresponds to part 
0003 of the patch series for master). Is this ok to merge? It's a 
regression that was introduced in Emacs 28.1, and the fix is pretty simple.

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From b04f42cca272b9a0f3b5e3167ce956523b161a7e Mon Sep 17 00:00:00 2001
From: Jim Porter <jporterbugs@gmail.com>
Date: Tue, 20 Dec 2022 16:20:50 -0800
Subject: [PATCH] When redirecting to the null device in Eshell, use
 "/dev/null"

This is so that users can type "cmd ... > /dev/null" in Eshell no
matter what their system's null device is called.  This partially
reverts 67a8bdb90c9b5865b7f17290c7135b1a5458c36d.

Do not merge to master.

* lisp/eshell/esh-io.el (eshell-set-output-handle): Use "/dev/null"
literally.
---
 lisp/eshell/esh-io.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/eshell/esh-io.el b/lisp/eshell/esh-io.el
index 4620565f857..6df40914060 100644
--- a/lisp/eshell/esh-io.el
+++ b/lisp/eshell/esh-io.el
@@ -342,7 +342,9 @@ eshell-set-output-handle
   (when target
     (let ((handles (or handles eshell-current-handles)))
       (if (and (stringp target)
-               (string= target (null-device)))
+               ;; This should be the literal string "/dev/null", not
+               ;; `null-device'.
+               (string= target "/dev/null"))
           (aset handles index nil)
         (let ((where (eshell-get-target target mode))
               (current (car (aref handles index))))
-- 
2.25.1