add --tag-only to prepare-platform-release-branch

src/platform-release.js

@@ -277,11 +277,13 @@ exports.prepareReleaseBranchCommand = function * () {
     executil.reportGitPushResult(repos, [repoBranchName, branchName]);
 };
 
-function * tagJs (repo, version, pretend) {
+function * tagJs (repo, version, pretend, tagOnly) {
 
     function * execOrPretend (cmd) {
         if (pretend) {
             print('PRETENDING TO RUN: ' + cmd.join(' '));
+        } else if (tagOnly && cmd[1] === 'push') {
+            print('SKIP: ' + cmd.join(' '));
         } else {
             yield executil.execHelper(cmd);
         }
@@ -313,18 +315,25 @@ exports.tagReleaseBranchCommand = function * (argv) {
             desc: 'Don\'t actually run git commands, just print out what would be run.',
             type: 'boolean'
         })
+        .options('tag-only', {
+            desc: 'Don\'t actually push to origin, just print out what would be pushed.',
+            type: 'boolean'
+        })
     );
     var repos = flagutil.computeReposFromFlag(argv.r);
     var version = flagutil.validateVersionString(argv.version);
     var pretend = argv.pretend;
     var branchName = versionutil.getReleaseBranchNameFromVersion(version);
+    var tagOnly = argv['tag-only'];
 
     // First - perform precondition checks.
     yield repoupdate.updateRepos(repos, [], true);
 
     function * execOrPretend (cmd) {
         if (pretend) {
             print('PRETENDING TO RUN: ' + cmd.join(' '));
+        } else if (tagOnly && cmd[1] === 'push') {
+            print('SKIP: ' + cmd.join(' '));
         } else {
             yield executil.execHelper(cmd);
         }
@@ -356,7 +365,7 @@ exports.tagReleaseBranchCommand = function * (argv) {
             } else {
                 print('Repo ' + repo.repoName + ' is already tagged.');
             }
-            yield tagJs(repo, version, pretend);
+            yield tagJs(repo, version, pretend, tagOnly);
 
         });
     });