$ git clone -n https://src.fedoraproject.org/rpms/bear.git /var/lib/mock/f38-build-side-42-init-devel-1210988-30632/root/chroot_tmpdir/scmroot/bear
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1210988-30632/root/chroot_tmpdir/scmroot/bear'...
$ git fetch origin dc20482e8473a8795cff2dc5abc6211b144bdd65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bear
 * [new ref]         dc20482e8473a8795cff2dc5abc6211b144bdd65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc20482 Update to 3.1.2 (close RHBZ#2188808)