Make mergeProposalBranch asynchronous

Author: codebytere

lib/promote_release.js

@@ -151,7 +151,7 @@ class ReleasePromotion {
     const keyPath = await cli.prompt(
       `Please enter the path to your ssh key (Default ${defaultKeyPath}): `,
       { questionType: 'input', defaultAnswer: defaultKeyPath });
-    await this.promoteAndSignRelease(keyPath);
+    this.promoteAndSignRelease(keyPath);
 
     cli.separator();
     cli.ok(`Release promotion for ${version} complete.\n`);
@@ -298,12 +298,12 @@ class ReleasePromotion {
     const releaseBranch = `v${versionComponents.major}.x`;
     const proposalBranch = `v${version}-proposal`;
 
-    runSync('git', ['checkout', releaseBranch]);
-    runSync('git', ['merge', '--ff-only', proposalBranch]);
-    runSync('git', ['push', 'upstream', releaseBranch]);
-    runSync('git', ['checkout', stagingBranch]);
-    runSync('git', ['rebase', releaseBranch]);
-    runSync('git', ['push', 'upstream', stagingBranch]);
+    await runAsync('git', ['checkout', releaseBranch]);
+    await runAsync('git', ['merge', '--ff-only', proposalBranch]);
+    await runAsync('git', ['push', 'upstream', releaseBranch]);
+    await runAsync('git', ['checkout', stagingBranch]);
+    await runAsync('git', ['rebase', releaseBranch]);
+    await runAsync('git', ['push', 'upstream', stagingBranch]);
   }
 
   pushReleaseTag() {
@@ -321,7 +321,7 @@ class ReleasePromotion {
     // Since we've committed the Working On commit, the release
     // commit will be 1 removed from tip-of-tree (e.g HEAD~1).
     const releaseCommitSha = this.getCommitSha(1);
-    runSync('git', ['checkout', 'master']);
+    runAsync('git', ['checkout', 'master']);
 
     // Pull master from upstream, in case it's not up-to-date.
     runSync('git', ['pull', '--rebase', 'upstream', 'master']);