$ git clone -n https://src.fedoraproject.org/rpms/e16-themes.git /var/lib/mock/f45-build-7902-371/root/chroot_tmpdir/scmroot/e16-themes
Cloning into '/var/lib/mock/f45-build-7902-371/root/chroot_tmpdir/scmroot/e16-themes'...
$ git fetch origin 098ebe00e748fd202cc60a3d4a81e232136ac96a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/e16-themes
 * [new ref]         098ebe00e748fd202cc60a3d4a81e232136ac96a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 098ebe0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild