From b6215001cf4008549e2d17f6dc57822ba4d24ab9 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Sun, 4 Jun 2017 16:22:50 +1000
Subject: [PATCH] Add clear line to console_log only if stderr is going to
 console.

---
 src/ckpool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ckpool.c b/src/ckpool.c
index d3e71b4b..784a6a1f 100644
--- a/src/ckpool.c
+++ b/src/ckpool.c
@@ -57,7 +57,10 @@ static bool open_logfile(ckpool_t *ckp)
  * on any delays. */
 static void console_log(ckpool_t __maybe_unused *ckp, char *msg)
 {
-	fprintf(stderr, "\33[2K\r%s", msg);
+	/* Add clear line only if stderr is going to console */
+	if (isatty(fileno(stderr)))
+		fprintf(stderr, "\33[2K\r");
+	fprintf(stderr, "%s", msg);
 	fflush(stderr);
 
 	free(msg);