$ git clone -n https://git.cclinux.org/stage/rpms/tuna.git /var/lib/mock/dist-circle8-build-113371-73389/root/chroot_tmpdir/scmroot/tuna
Cloning into '/var/lib/mock/dist-circle8-build-113371-73389/root/chroot_tmpdir/scmroot/tuna'...
$ git fetch origin 47a39067d5bf495c0c3381a36a0bf9538bc396a5:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/tuna
 * [new ref]         47a39067d5bf495c0c3381a36a0bf9538bc396a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47a3906 import tuna-0.18-9.el8