1 files changed, 27 insertions, 0 deletions
diff --git a/lock.sh b/lock.sh
new file mode 100644
index 0000000..a67e019
--- /dev/null
+++ b/lock.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+cd $1
+
+set -o noclobber
+{ > status_waiting; }
+if [ "$?" != "0" ]
+then
+    echo "Some other thread is alreay waiting. Exit."
+
+    set +o noclobber
+    cd -
+    exit 1
+else
+
+    { > status_running; }
+    while [ "$?" != "0" ]
+    do
+        echo "Some other thread is already building. Waiting 5 sec!"
+        sleep 5
+        { > status_running; }
+    done
+    rm status_waiting
+
+    set +o noclobber
+    cd -
+    exit 0
+fi