From d8fd31f50ff55f7f334a2b9e58a82570e82ec28d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 18 Feb 2020 17:47:53 +0100
Subject: [PATCH] Disable the progress bar if $TERM == dumb or unset

Fixes #3363.
---
 src/nix/progress-bar.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/nix/progress-bar.cc b/src/nix/progress-bar.cc
index c445f31ccf3..26631416cc2 100644
--- a/src/nix/progress-bar.cc
+++ b/src/nix/progress-bar.cc
@@ -446,7 +446,9 @@ class ProgressBar : public Logger
 
 void startProgressBar(bool printBuildLogs)
 {
-    logger = new ProgressBar(printBuildLogs, isatty(STDERR_FILENO));
+    logger = new ProgressBar(
+        printBuildLogs,
+        isatty(STDERR_FILENO) && getEnv("TERM").value_or("dumb") != "dumb");
 }
 
 void stopProgressBar()