$ git clone -n https://src.fedoraproject.org/rpms/erlang-riaknostic.git /var/lib/mock/f45-build-8436-389/root/chroot_tmpdir/scmroot/erlang-riaknostic
Cloning into '/var/lib/mock/f45-build-8436-389/root/chroot_tmpdir/scmroot/erlang-riaknostic'...
$ git fetch origin c000ea813fcc9bf8b566146ec9499eb54da72f1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-riaknostic
 * [new ref]         c000ea813fcc9bf8b566146ec9499eb54da72f1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c000ea8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild