run litmus scripts only if code in the dav app did change changed

.travis.yml

@@ -21,6 +21,7 @@ addons:
     - realpath
 
 before_install:
+  - bash tests/travis/test_for_app.sh $APP
   - bash tests/travis/before_install.sh $DB
 
 install:

apps/dav/tests/travis/litmus-v1.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-
 SCRIPT=`realpath $0`
 SCRIPTPATH=`dirname $SCRIPT`
 

apps/dav/tests/travis/litmus-v2.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-
 SCRIPT=`realpath $0`
 SCRIPTPATH=`dirname $SCRIPT`
 

tests/travis/test_for_app.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# ownCloud
+#
+# @author Thomas Müller
+# @copyright 2015 Thomas Müller thomas.mueller@tmit.eu
+#
+
+set -e
+APP=$1
+
+if git diff ${TRAVIS_COMMIT_RANGE} | grep -- "^+++ b/apps/$APP/"; then
+	echo "Executing this test config ...."
+else
+	echo "Test config is not relevant for this change. terminating"
+	exit 1
+fi