pg_checksums_progress_eta_V0.patch

diff --git a/src/bin/pg_checksums/pg_checksums.c b/src/bin/pg_checksums/pg_checksums.c
index a439da231f..1d82b92bf0 100644
--- a/src/bin/pg_checksums/pg_checksums.c
+++ b/src/bin/pg_checksums/pg_checksums.c
@@ -136,6 +136,7 @@ report_progress(bool force)
 {
 	instr_time	now;
 	double		elapsed;
+	double		remaining;
 	double		total_percent;
 	double		current_speed;
 
@@ -163,6 +164,9 @@ report_progress(bool force)
 	/* Calculate current percent done */
 	total_percent = total_size ? 100.0 * current_size / total_size : 0.0;
 
+	/* Calculate remaining time in milliseconds */
+	remaining = elapsed * (100 / total_percent) - elapsed;
+
 #define MEGABYTES (1024 * 1024)
 
 	/* Calculate current speed */
@@ -173,8 +177,13 @@ report_progress(bool force)
 	snprintf(currentstr, sizeof(currentstr), INT64_FORMAT,
 			 current_size / MEGABYTES);
 
-	fprintf(stderr, "%s/%s MB (%d%%, %.0f MB/s)",
-			currentstr, totalstr, (int)total_percent, current_speed);
+	/* Only print remainging time after five seconds */
+	if (elapsed / 1000 < 5)
+		fprintf(stderr, "%s/%s MB (%d%%, %.0f MB/s)%20s",
+				currentstr, totalstr, (int)total_percent, current_speed, "");
+	else
+		fprintf(stderr, "%s/%s MB (%d%%, %.0f MB/s, %.0f s remaining)%20s",
+				currentstr, totalstr, (int)total_percent, current_speed, remaining / 1000, "");
 
 	/* Stay on the same line if reporting to a terminal */
 	fprintf(stderr, isatty(fileno(stderr)) ? "\r" : "\n");