Add backward-compatibility between old/new testgrid yaml file. (#768)

* Add backward compatibility with old testgrid yaml file.

* Change contant TestGrid yaml.

* Fix review suggestions.

Author: pasindujw

common/src/main/java/org/wso2/testgrid/common/TestGridConstants.java

@@ -27,13 +27,14 @@
  */
 public class TestGridConstants {
 
-    public static final String TESTGRID_YAML = ".testgrid.yaml";
+    public static final String TESTGRID_YAML = "testgrid.yaml";
     public static final String TEST_PLAN_YAML_PREFIX = "test-plan";
 
     public static final String TESTGRID_LOG_FILE_NAME = "testgrid.log";
     public static final String TESTGRID_LOGS_DIR = "logs";
     public static final String PRODUCT_TEST_PLANS_DIR = "test-plans";
     public static final String FILE_SEPARATOR = "/";
+    public static final String HIDDEN_FILE_INDICATOR = ".";
     public static final String LOG_FILE_EXTENSION = ".log";
 
     public static final String WORKSPACE = "workspace";

core/src/main/java/org/wso2/testgrid/core/command/GenerateTestPlanCommand.java

@@ -349,19 +349,17 @@ private TestgridYaml buildTestgridYamlContent(JobConfigFile jobConfigFile) {
         StringBuilder testgridYamlBuilder = new StringBuilder();
         String ls = System.lineSeparator();
         testgridYamlBuilder
-                .append(getTestgridYamlFor(Paths.get(infraRepositoryLocation, TestGridConstants.TESTGRID_YAML)))
+                .append(getTestgridYamlFor(getTestGridYamlLocation(infraRepositoryLocation)))
                 .append(ls);
         String testgridYamlContent = testgridYamlBuilder.toString().trim();
         if (!testgridYamlContent.isEmpty()) {
             if (!testgridYamlContent.contains("deploymentConfig")) {
                 testgridYamlBuilder
-                        .append(getTestgridYamlFor(
-                                Paths.get(deployRepositoryLocation, TestGridConstants.TESTGRID_YAML)))
+                        .append(getTestgridYamlFor(getTestGridYamlLocation(deployRepositoryLocation)))
                         .append(ls);
             }
             testgridYamlBuilder
-                    .append(getTestgridYamlFor(
-                            Paths.get(scenarioTestsRepositoryLocation, TestGridConstants.TESTGRID_YAML)))
+                    .append(getTestgridYamlFor(getTestGridYamlLocation(scenarioTestsRepositoryLocation)))
                     .append(ls);
         } else {
             logger.warn(StringUtil.concatStrings(
@@ -630,4 +628,20 @@ protected NodeTuple representJavaBeanProperty(Object javaBean, Property property
             }
         }
     }
+
+    /**
+     * If the testgrid yaml file is hidden in the directory, change the URI as to refer the hidden file.
+     * @param directory directory where the testgrid yaml file exists
+     * @return testgrid yaml file path
+     */
+    private Path getTestGridYamlLocation(String directory) {
+        Path hiddenYamlPath = Paths.get(
+                directory, TestGridConstants.HIDDEN_FILE_INDICATOR + TestGridConstants.TESTGRID_YAML);
+        Path defaultYamlPath = Paths.get(directory, TestGridConstants.TESTGRID_YAML);
+        if (Files.exists(hiddenYamlPath)) {
+            return hiddenYamlPath;
+        } else {
+            return defaultYamlPath;
+        }
+    }
 }