Test for uncommited changes in gradle

app/build.gradle

@@ -67,6 +67,26 @@ def generateDate = { ->
     return stringBuilder.toString()
 }
 
+def isMaster = { ->
+    return !version.contains('-')
+}
+
+def allCommited = { ->
+    StringBuilder stringBuilder = new StringBuilder();
+    try {
+        def stdout = new ByteArrayOutputStream()
+        exec {
+            commandLine 'git', 'status'
+            standardOutput = stdout
+        }
+        String commitObject = stdout.toString().trim()
+        stringBuilder.append(commitObject)
+    } catch (ignored) {
+        return false; // NoGitSystemAvailable
+    }
+    return stringBuilder.toString().contains("nothing to commit")
+}
+
 tasks.matching { it instanceof Test }.all {
     testLogging.events = ["failed", "skipped", "started"]
     testLogging.exceptionFormat = "full"
@@ -274,3 +294,12 @@ task full_clean(type: Delete) {
 
 clean.dependsOn full_clean
 preBuild.dependsOn copyLibs
+
+printf('--------------\n')
+printf('isMaster: %s\n', isMaster().toString())
+printf('allCommited: %s\n', allCommited().toString())
+printf('--------------\n')
+if (isMaster() && !allCommited()) {
+    throw new GradleException('There are uncommitted changes or git system is not available. Clone sources again as described in wiki and do not allow gradle update')
+}
+