$ git clone -n https://src.fedoraproject.org/rpms/erlang-webmachine.git /var/lib/mock/f45-build-8478-389/root/chroot_tmpdir/scmroot/erlang-webmachine
Cloning into '/var/lib/mock/f45-build-8478-389/root/chroot_tmpdir/scmroot/erlang-webmachine'...
$ git fetch origin b62e1c8857a274f7cbb82d9dd1759738192ebcfa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-webmachine
 * [new ref]         b62e1c8857a274f7cbb82d9dd1759738192ebcfa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b62e1c8 Webmachine 1.13.0