ci(travis): add custom npm install script/lock updater

BerkeleyTrue · BerkeleyTrue · commit 2dfa8b0ec728 · 2018-06-04T20:33:07.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,10 +5,15 @@ node_js:
   - '8'
   - '10'
 
-before_install: if [[ `npm -v` != 6* ]]; then npm install -g npm@6; fi
+before_install:
+  - if [[ `npm -v` != 6* ]]; then npm install -g npm@6; fi
+  - npm install -g greenkeeper-lockfile
 
 install:
-  - npm ci
+  - node travis-install.js
+
+before_script: greenkeeper-lockfile-update
+after_script: greenkeeper-lockfile-upload
 
 cache:
   directories:
diff --git a/travis-install.js b/travis-install.js
@@ -0,0 +1,58 @@
+/* eslint-disable max-len */
+'use strict';
+
+const exec = require('child_process').execSync;
+
+const env = process.env;
+
+const info = {
+  // The GitHub repo slug
+  repoSlug: env.TRAVIS_REPO_SLUG,
+  // The name of the current branch
+  branchName: env.TRAVIS_BRANCH,
+  // Is this the first push on this branch
+  // i.e. the Greenkeeper commit
+  firstPush: !env.TRAVIS_COMMIT_RANGE,
+  // Is this a regular build
+  correctBuild: env.TRAVIS_PULL_REQUEST === 'false',
+  // Should the lockfile be uploaded from this build
+  uploadBuild:
+    env.TRAVIS_JOB_NUMBER &&
+    env.TRAVIS_JOB_NUMBER.endsWith(`.${env.BUILD_LEADER_ID || 1}`),
+};
+
+function isGreenkeeperBranch() {
+  if (!info.branchName) {
+    console.error(
+      'No branch details set, so assuming not a Greenkeeper branch',
+    );
+    return false;
+  }
+
+  if (!info.branchName.startsWith('greenkeeper')) {
+    console.log(`${info.branchName} is not a greenkeeper branch`);
+    return false;
+  }
+
+  return true;
+}
+
+function execCmd(cmd) {
+  return exec(cmd, { stdio: [
+    process.stdin,
+    process.stdout,
+    process.stderr,
+  ] });
+}
+module.exports = function() {
+  if (isGreenkeeperBranch()) {
+    console.log('found greenkeeper branch build, use npm install');
+    return execCmd('npm install');
+  }
+  console.log('running npm ci');
+  return execCmd('npm ci');
+};
+
+if (require.main === module) {
+  module.exports();
+}
