write-presubmit-scheduler.js

#!/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 ng-material. 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/v1-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 = path.join(process.env.MAT_PRESUBMIT_DIR, 'sync-material.sh');

/** Time to start presubmits. */
const startTime = '9:30 pm';

/** Number of minutes between presubmit runs. */
const intervalMinutes = 20;

/** 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/material 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} presubmit ${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, that you have no locally modified files, ' +
              'and push_tag has been run');
}