nlm/lib/git/ensure-tag.js

Lifecycle manager for node projects

/*
 * Copyright (c) 2015, Groupon, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * Neither the name of GROUPON nor the names of its contributors may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

'use strict';

const path = require('path');

const fs = require('fs');

const run = require('../run');

function fetchTag(cwd, tag) {
  return run('git', ['fetch', 'origin', 'tag', tag], { cwd });
}
/**
 * Ensure that a tag was fetched from the remote
 *
 * DotCI only fetches the ref that is currently being built.
 * We need the last version tag to determine the changes.
 * This checks if a tag exists locally. If it doesn't, it will
 * fetch the tag from `origin`.
 */

function ensureTag(cwd, tag) {
  if (tag === 'v0.0.0') {
    // There is no such thing (most likely)
    return null;
  }

  const tagFile = path.join(cwd, '.git', 'refs', 'tags', tag);

  try {
    return fs.readFileSync(tagFile);
  } catch (error) {
    if (error.code !== 'ENOENT') {
      throw error;
    }

    return fetchTag(cwd, tag);
  }
}

module.exports = ensureTag;