$ git clone -n https://src.fedoraproject.org/rpms/erlang-mustache.git /var/lib/mock/f45-build-8383-386/root/chroot_tmpdir/scmroot/erlang-mustache
Cloning into '/var/lib/mock/f45-build-8383-386/root/chroot_tmpdir/scmroot/erlang-mustache'...
$ git fetch origin b13e1b4434b32499b063acf6a2fb9bbc1c413f8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-mustache
 * [new ref]         b13e1b4434b32499b063acf6a2fb9bbc1c413f8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b13e1b4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild