$ git clone -n https://src.fedoraproject.org/rpms/reg.git /var/lib/mock/f39-build-1887743-42786/root/chroot_tmpdir/scmroot/reg
Cloning into '/var/lib/mock/f39-build-1887743-42786/root/chroot_tmpdir/scmroot/reg'...
$ git fetch origin 9048be804fc19648fc081a19ff5aa735a17e2f28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reg
 * [new ref]         9048be804fc19648fc081a19ff5aa735a17e2f28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9048be8 Explicitly depends on quay v3