bug#63411: [PATCH] pcomplete/systemctl cannot complete units for old versions of systemd

[Liu Hui <liuhui1610@gmail.com>]

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Here is the patch that fixes the problem.

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From aaba4753ada1c003171d9a5342c87a945992e62f Mon Sep 17 00:00:00 2001
From: Liu Hui <liuhui1610@gmail.com>
Date: Wed, 17 May 2023 16:39:18 +0800
Subject: [PATCH] Fix systemd unit completion for old versions of systemd

* lisp/pcmpl-linux.el (pcmpl-linux--systemd-units): Use '--no-legend'
for compatibility.
---
 lisp/pcmpl-linux.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/pcmpl-linux.el b/lisp/pcmpl-linux.el
index 082072d87d2..589b4799c8d 100644
--- a/lisp/pcmpl-linux.el
+++ b/lisp/pcmpl-linux.el
@@ -119,7 +119,8 @@ pcmpl-linux--systemd-units
   (with-temp-buffer
     (apply #'call-process
            "systemctl" nil '(t nil) nil
-           "list-units" "--full" "--legend=no" "--plain" args)
+           ;; "--legend=no" doesn't exist before systemd v248
+           "list-units" "--full" "--no-legend" "--plain" args)
     (goto-char (point-min))
     (let (result)
       (while (re-search-forward (rx bol (group (+ (not space)))
-- 
2.25.1