From 5dfc67bf332c73ae1cb690974693721d3ad59307 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Mon, 16 May 2016 13:15:42 +0000
Subject: [PATCH] abuild-fetch: retry to create lock on ESTALE

---
 abuild-fetch.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/abuild-fetch.c b/abuild-fetch.c
index aaac7b3..d723550 100644
--- a/abuild-fetch.c
+++ b/abuild-fetch.c
@@ -26,6 +26,7 @@ THE SOFTWARE.
 #include <sys/wait.h>
 
 #include <err.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
@@ -99,9 +100,16 @@ int fetch(char *url, const char *destdir)
 		err(1, lockfile);
 
 	if (fcntl(lockfd, F_SETLK, &fl) < 0) {
+		int i;
 		printf("Waiting for %s ...\n", lockfile);
-		if (fcntl(lockfd, F_SETLKW, &fl) < 0)
-			err(1, "fcntl(F_SETLKW)");
+		for (i=0; i<10; i++) {
+			int r = fcntl(lockfd, F_SETLKW, &fl);
+			if (r == 0)
+				break;
+			if (r == -1 && errno != ESTALE)
+				err(1, "fcntl(F_SETLKW)");
+			sleep(1);
+		}
 	}
 
 	if (access(outfile, F_OK) == 0)