From cfa1d2e02fa3392431cbcf0d483d86bb7b3ad6ec Mon Sep 17 00:00:00 2001
From: Fabio Rehm <fgrehm@gmail.com>
Date: Sun, 9 Mar 2014 22:59:18 -0300
Subject: [PATCH] boxes: Update lxc-template to use a file lock around rootfs
 extraction

---
 boxes/common/lxc-template | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/boxes/common/lxc-template b/boxes/common/lxc-template
index a9318d1..b420c2a 100755
--- a/boxes/common/lxc-template
+++ b/boxes/common/lxc-template
@@ -106,8 +106,24 @@ fi
 # Unpack the rootfs
 echo "Unpacking the rootfs"
 
-mkdir -p ${LXC_ROOTFS}
-(cd ${LXC_ROOTFS} && tar xfz ${LXC_TARBALL} --strip-components=2)
+
+(
+    flock -x 200
+    if [ $? -ne 0 ]; then
+        echo "Cache repository is busy."
+        return 1
+    fi
+
+    mkdir -p ${LXC_ROOTFS}
+    (cd ${LXC_ROOTFS} && tar xfz ${LXC_TARBALL} --strip-components=2)
+    if [ $? -ne 0 ]; then
+        echo "Failed to extract rootfs"
+        return 1
+    fi
+
+    return 0
+
+) 200>/var/lock/subsys/lxc
 
 mkdir -p ${LXC_ROOTFS}/dev/pts/