Use grunt-shell to retrieve git commit if not existent as environment variable

gruntfile.js

@@ -63,9 +63,17 @@ module.exports = function(grunt) {
     var getCommitSha = function() {
         if (process.env.GIT_COMMIT) {
             return process.env.GIT_COMMIT;
+        }
         return "";
     };
 
+    var assignGitSHA = function(err, stdout, stderr, cb) {
+        if (!localCfg.commitSHA) {
+            localCfg.commitSHA = stdout.replace("\n", "");
+        }
+        cb();
+    };
+
     var getPackageVersion = function() {
         var buildVersion = process.env.PACKAGE_VERSION;
         if (!buildVersion) {
@@ -108,6 +116,7 @@ module.exports = function(grunt) {
             "!./ui/slide-out/**/*.*"
         ]
     };
+
     localCfg.mainPackageContent = grunt.file.readJSON(localCfg.packageJsonFilePath);
     localCfg.packageVersion = getPackageVersion(localCfg.packageJsonFilePath);
     localCfg.commitSHA = getCommitSha();
@@ -305,6 +314,14 @@ module.exports = function(grunt) {
                     return targetDirs;
                 }()
             }
+        },
+        shell: {
+            getGitSHA: {
+                command: "git rev-parse HEAD",
+                options: {
+                    callback: assignGitSHA
+                }
+            }
         }
     });
 
@@ -314,6 +331,7 @@ module.exports = function(grunt) {
     grunt.loadNpmTasks("grunt-exec");
     grunt.loadNpmTasks("grunt-tslint");
     grunt.loadNpmTasks("grunt-multi-dest");
+    grunt.loadNpmTasks("grunt-shell");
 
     var cloneTasks = function(originalTasks, taskNameSuffix)
     {
@@ -425,6 +443,7 @@ module.exports = function(grunt) {
 
     grunt.registerTask("default", ((typeof(grunt.option('runtslint')) != "undefined" && !grunt.option('runtslint')) ? [] : ["tslint:build"]).concat([
         "clean:build",
+        "shell:getGitSHA",
 
         "collect-apps-raw-files",
         "collect-definitions-raw-files",

package.json

@@ -3,8 +3,8 @@
   "description": "Telerik NativeScript Core",
   "version": "0.4.2",
   "repository": {
-      "type": "git",
-      "url": "https://github.com/NativeScript/cross-platform-modules"
+    "type": "git",
+    "url": "https://github.com/NativeScript/cross-platform-modules"
   },
   "files": [
     "**/*.*",
@@ -17,6 +17,7 @@
     "grunt-contrib-copy": "0.5.0",
     "grunt-exec": "0.4.5",
     "grunt-multi-dest": "1.0.0",
+    "grunt-shell": "1.1.2",
     "grunt-ts": "1.12.1",
     "grunt-tslint": "0.4.2",
     "typescript": "1.4.1"