[PATCHv3 02/11] run-command: report failure for degraded output just once

[Stefan Beller <sbeller@google.com>]

The warning message is cluttering the output itself,
so just report it once.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 run-command.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/run-command.c b/run-command.c
index 7c00c21..3ae563f 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1012,13 +1012,21 @@ static void pp_cleanup(struct parallel_processes *pp)
 
 static void set_nonblocking(int fd)
 {
+	static int reported_degrade = 0;
 	int flags = fcntl(fd, F_GETFL);
-	if (flags < 0)
-		warning("Could not get file status flags, "
-			"output will be degraded");
-	else if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
-		warning("Could not set file status flags, "
-			"output will be degraded");
+	if (flags < 0) {
+		if (!reported_degrade) {
+			warning("Could not get file status flags, "
+				"output will be degraded");
+			reported_degrade = 1;
+		}
+	} else if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
+		if (!reported_degrade) {
+			warning("Could not set file status flags, "
+				"output will be degraded");
+			reported_degrade = 1;
+		}
+	}
 }
 
 /* returns
-- 
2.6.1.247.ge8f2a41.dirty