Function getRubyPath

packages/ruby/src/install-ruby.ts:109–223

(meta: Meta, gemfileContents: string)

}

function getRubyPath(meta: Meta, gemfileContents: string) {
  let selection: RubyVersion | null = null;
  try {
    selection = getLatestRubyVersion();
  } catch {
    selection = null;
  }
  if (meta.isDev) {
    const sys = resolveSystemRuby();
    if (sys) {
      const result = makeLocalRubyEnv(sys);
      debug(
        `ruby: using system ruby for local dev: ${JSON.stringify({ ruby: sys.rubyPath, gem: sys.gemPath, version: `${sys.major}.${sys.minor}` })}`
      );
      return result;
    }
    throw new NowBuildError({
      code: 'RUBY_INVALID_VERSION',
      link: 'http://vercel.link/ruby-version',
      message:
        'Unable to find any supported Ruby versions (local). Ensure ruby and gem are on PATH.',
    });
  } else if (gemfileContents) {
    const line = gemfileContents
      .split('\n')
      .find(line => line.startsWith('ruby'));
    if (line) {
      const strVersion = line.slice(4).trim().slice(1, -1).replace(/~>\s*/, '');
      const found = allOptions.some(o => {
        // The array is already in order so return the first
        // match which will be the newest version.
        selection = o;
        return intersects(o.range, strVersion);
      });
      if (!found) {
        throw new NowBuildError({
          code: 'RUBY_INVALID_VERSION',
          message: `Found \`Gemfile\` with invalid Ruby version: \`${line}.\``,
          link: 'http://vercel.link/ruby-version',
        });
      }

      if (
        !selection ||
        selection.state === 'discontinued' ||
        !isInstalled(selection)
      ) {
        const sys = resolveSystemRuby();
        if (sys) {
          const sysRange = `${sys.major}.${sys.minor}.x`;
          if (!strVersion || intersects(sysRange, strVersion)) {
            const result = makeLocalRubyEnv(sys);
            debug(
              `ruby: using system ruby (Gemfile) version=${sys.major}.${sys.minor} ruby=${sys.rubyPath}`
            );
            return result;
          }
        }