chore: add script to generate presubmit scheduler script (#8581)

package.json

@@ -69,6 +69,7 @@
     "firebase-admin": "^5.0.0",
     "firebase-tools": "^3.11.0",
     "fs-extra": "^3.0.1",
+    "github": "^12.0.3",
     "glob": "^7.1.2",
     "google-closure-compiler": "20170409.0.0",
     "gulp": "^3.9.1",

scripts/caretaking/write-presumbit-scheduler.js

@@ -0,0 +1,82 @@
+#!/usr/bin/env node
+
+const path = require('path');
+const fs = require('fs');
+const GitHubApi = require('github');
+const github = new GitHubApi();
+
+
+/** CONFIGURATION: change these things if you want to tweak how the runs are made. */
+
+/** Path to the local material2. By default based on the location of this script. */
+const localRepo = path.resolve(__dirname, '..', '..');
+
+/** Where to write the output from the presubmit script. */
+const logDir = '/tmp/pr-presubmit-logs';
+
+/**
+ * The presubmit script to use (can change this if you want to use a locally modified script).
+ * The default path is stored in an environment variable because it references an internal-Google
+ * location.
+ */
+const presubmitScript = `${process.env.MAT_PRESUBMIT_DIR}/material-presubmit.sh`;
+
+/** Time to start presubmits. */
+const startTime = '9:30 pm';
+
+/** Number of minutes between presubmit runs. */
+const intervalMinutes = 10;
+
+/** Instead of querying github for PR numbers, manually provide the PR numbers to be presubmit */
+const explicitPullRequests = [];
+
+/** END OF CONFIGURATION. */
+
+
+
+/** Number of intervals that have scheduled tasks already. */
+let presubmitCount = 0;
+
+if (explicitPullRequests.length) {
+  writeScheduleScript(explicitPullRequests.map(n => ({number: n})));
+} else {
+  // Fetch PRs that are merge-ready but not merge-safe
+  github.search.issues({
+    per_page: 100,
+    q: 'repo:angular/material2 is:open type:pr label:"pr: merge ready" -label:"pr: merge safe"',
+  }, (error, response) => {
+    if (response) {
+      writeScheduleScript(response.data.items);
+    } else {
+      console.error('Fetching merge-ready PRs failed.');
+      console.error(error);
+    }
+  });
+}
+
+
+function writeScheduleScript(prs) {
+  let script =
+    `#!/bin/bash \n\n` +
+    `mkdir -p ${logDir} \n\n` +
+    `# Be sure you have no locally modified files in your git client before running this. \n\n`;
+
+  // Generate a command for each file to be piped into the `at` command, scheduling it to run at
+  // a later time.
+  for (const pr of prs) {
+    script +=
+      `echo '(` +
+        `cd ${localRepo} ; ` +
+        `${presubmitScript} ${pr.number} --global 2>&1 > ${logDir}/pr-${pr.number}.txt ` +
+      `)' | ` +
+      `at ${startTime} today + ${intervalMinutes * presubmitCount} min ` +
+    `\n`;
+
+    presubmitCount++;
+  }
+
+  fs.writeFileSync(path.join(localRepo, 'dist', 'schedule-presubmit.sh'), script, 'utf-8');
+
+  console.log('schedule-presubmit.sh written to dist');
+  console.log('Be sure to prodaccess overnight and that you have no locally modified files');
+}