From 24b22a84c7196c0a8e0d2d734286998a093a282d Mon Sep 17 00:00:00 2001
From: Alex Domingo <alex.domingo.toro@vub.be>
Date: Mon, 23 Dec 2024 00:51:35 +0100
Subject: [PATCH] only add stdin to non-blocking channels if there is content
 for it

---
 easybuild/tools/run.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/easybuild/tools/run.py b/easybuild/tools/run.py
index 4f83acd9c3..c327930a8d 100644
--- a/easybuild/tools/run.py
+++ b/easybuild/tools/run.py
@@ -514,9 +514,12 @@ def to_cmd_str(cmd):
 
         if qa_patterns:
             # make stdout, stderr, stdin non-blocking files
-            channels = [proc.stdout, proc.stdin]
+            channels = [proc.stdout]
+            if stdin:
+                channels.append(proc.stdin)
             if split_stderr:
-                channels += proc.stderr
+                channels.append(proc.stderr)
+
             for channel in channels:
                 fd = channel.fileno()
                 flags = fcntl.fcntl(fd, fcntl.F_GETFL)