generate-build-info.js

#!/usr/bin/env node

/* eslint-disable no-console */

const appInfoFile = `${__dirname}/../src/appinfo.js`;
const async = require('async');
const cp = require('child_process');
const fs = require('fs');

const exec = cmd => cb => cp.exec(cmd, (err, stdout, _stderr) => cb(err, ('' || stdout).trim()));

const buildOutput = results => {
  const data = {
    commitHash: results.commit,
    branch: results.branch,
    changeDate: results.changeDate
  };

  if (process.argv[2] === '--add-builddate') {
    data.buildDate = new Date().toISOString();
  }

  // make the format returned from git the same as from node
  data.changeDate = new Date(data.changeDate).toISOString();

  return 'const data = ' + JSON.stringify(data, null, '  ') + ';\n' + 'export default data;';
};

const gitcmd = 'git --git-dir ../.git --work-tree ..';
async.parallel(
  {
    branch: exec(gitcmd + ' rev-parse --abbrev-ref HEAD'),
    commit: exec(gitcmd + ' rev-parse HEAD'),
    changeDate: exec(gitcmd + ' show -s --format=%ci HEAD') // iso-like string. %cI (strict iso) is only supported in newer git versions (2.6+?), and the server has git 2.1
  },
  (err, results) => {
    if (err) {
      console.error(err);
      process.exit(1);
    }

    fs.writeFile(appInfoFile, buildOutput(results), err => {
      if (err) {
        console.error(err);
        process.exit(1);
      }
    });
  }
);