From a7a05deb37b3db6aa3606f488467f621c40ce32d Mon Sep 17 00:00:00 2001
From: "Jan Alexander Steffens (heftig)" <jan.steffens@gmail.com>
Date: Thu, 2 May 2013 07:03:12 +0200
Subject: lib/common.sh: Introduce locking helper functions

Reduces code duplication.

With makechrootpkg not calling mkarchroot anymore,
the lock handover protocol is unneeded.

arch-nspawn does not do any locking, so add protection to archbuild.
---
 lib/common.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'lib')

diff --git a/lib/common.sh b/lib/common.sh
index b39bbbc..9446ff5 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -130,3 +130,27 @@ get_full_version() {
 		fi
 	fi
 }
+
+##
+#  usage : lock( $fd, $file, $message )
+##
+lock() {
+	eval "exec $1>"'"$2"'
+	if ! flock -n $1; then
+		stat_busy "$3"
+		flock $1
+		stat_done
+	fi
+}
+
+##
+#  usage : slock( $fd, $file, $message )
+##
+slock() {
+	eval "exec $1>"'"$2"'
+	if ! flock -sn $1; then
+		stat_busy "$3"
+		flock -s $1
+		stat_done
+	fi
+}
-- 
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