$ git clone -n https://src.fedoraproject.org/rpms/osbs-client.git /var/lib/mock/f45-build-21186-580/root/chroot_tmpdir/scmroot/osbs-client
Cloning into '/var/lib/mock/f45-build-21186-580/root/chroot_tmpdir/scmroot/osbs-client'...
$ git fetch origin a0802ff6985813276832be5dafbbee39e00f90cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/osbs-client
 * [new ref]         a0802ff6985813276832be5dafbbee39e00f90cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0802ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild