==> Creating clean working copy [build]...done
==> Making package: python-aiohttp 2.1.0-1 (Sat Jun  3 04:37:10 EDT 2017)
==> Retrieving sources...
  -> Found python-aiohttp-2.1.0.tar.gz
==> Validating source files with sha256sums...
    python-aiohttp-2.1.0.tar.gz ... Passed
==> Validating source files with sha512sums...
    python-aiohttp-2.1.0.tar.gz ... Passed
==> Making package: python-aiohttp 2.1.0-1 (Sat Jun  3 04:37:11 EDT 2017)
==> Checking runtime dependencies...
==> Installing missing dependencies...
error: failed to init transaction (unable to lock database)
error: could not lock database: File exists
  if you're sure a package manager is not already
  running, you can remove /var/lib/pacman/db.lck
==> ERROR: 'pacman' failed to install missing dependencies.
==> WARNING: Failed to remove installed dependencies.
==> ERROR: Build failed, check /chroot/i686/build/build