linus/index.js

Get Linux distro name and version.

var readFile = require('fs').readFile,
    exec     = require('child_process').exec,
    memorize = require('memorize'),
    later    = require('whenever'),
    delayed  = later('getos');

var is_linux = process.platform === 'linux';

var lsb_release = memorize(function(option, cb) {
  exec('lsb_release ' + option + ' -s', function(err, stdout) {
    if (err) return cb(err);
    cb(null, stdout.toString().trim());
  });
})

var detect_chromeos = memorize(function(cb) {
  readFile('/etc/lsb-release', function(err, data) {
    if (err) return cb(err);

    if (!data.toString().match('CHROMEOS_RELEASE_VERSION='))
      return cb(new Error('Not Chrome OS'));

    var nmatch   = data.toString().match(/CHROMEOS_RELEASE_NAME=(.+)/),
        vermatch = data.toString().match(/CHROMEOS_RELEASE_VERSION=(.+)/),
        name     = nmatch[1] || 'Chrome OS',
        version  = vermatch[1];

    cb(null, { name: name, version: version });
  })
})

var get_issue = memorize(function(filter_cb, cb) {
  var cmd = 'cat /etc/issue | head -1';
  exec(cmd, function(err, out) {
    if (err) return cb(err);
    cb(null, filter_cb(out.toString()).trim());
  });
})

var get_distro_info = function(what, lsb_param, issue_cb, cb) {
  lsb_release(lsb_param, function(err, res) {
    if (res && res != '')
      return cb(null, res);

    detect_chromeos(function(err, obj) {
      if (obj) return cb(null, obj[what]);

      get_issue(issue_cb, function(err, name) {
        if (err || !name)
          return cb(err || new Error("Couldn't get distro " + what + "."));

        cb(null, name);
      });
    })
  })
}

var issue_cbs = {};

issue_cbs.version = function(out) {
  return out.replace(/[^0-9\.]/g, '');
};

issue_cbs.name = function(out) {
  return out.replace(/\d.*/, '').replace('release', '');
};

exports.name = function(cb) {
  if (!is_linux)
    return cb(new Error('Not Linux.'));

  var done = function(err, name) {
    if (err) return cb(err);

    cb(null, name.toString().replace(' Linux', ''));
  }

  get_distro_info('name', '-i', issue_cbs.name, function(err, name) {

    // if it failed, fallback to getos' module strategy.
    if (err || (!name || name == ''))
      return delayed.getos(done);

    done(err, name);
  });
};

exports.version = function(cb) {
  if (!is_linux)
    return cb(new Error('Not Linux.'));

  get_distro_info('version', '-r', issue_cbs.version, cb);
};