lock

# File lib/bundler/process_lock.rb, line 5
    def self.lock(bundle_path = Bundler.bundle_path)
      lock_file_path = File.join(bundle_path, "bundler.lock")
      has_lock = false

      File.open(lock_file_path, "w") do |f|
        f.flock(File::LOCK_EX)
        has_lock = true
        yield
        f.flock(File::LOCK_UN)
      end
    rescue Errno::EACCES, Errno::ENOLCK, *[SharedHelpers.const_get_safely(:ENOTSUP, Errno)].compact
      # In the case the user does not have access to
      # create the lock file or is using NFS where
      # locks are not available we skip locking.
      yield
    ensure
      FileUtils.rm_f(lock_file_path) if has_lock
    end