$ git clone -n https://src.fedoraproject.org/rpms/erlang-bbmustache.git /var/lib/mock/f45-build-8225-379/root/chroot_tmpdir/scmroot/erlang-bbmustache
Cloning into '/var/lib/mock/f45-build-8225-379/root/chroot_tmpdir/scmroot/erlang-bbmustache'...
$ git fetch origin 70199c7bdd77f9c1b347d8aca8f08978427df7e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-bbmustache
 * [new ref]         70199c7bdd77f9c1b347d8aca8f08978427df7e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70199c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild