$ git clone -n https://src.fedoraproject.org/rpms/libdex.git /var/lib/mock/f39-build-1647169-40434/root/chroot_tmpdir/scmroot/libdex
Cloning into '/var/lib/mock/f39-build-1647169-40434/root/chroot_tmpdir/scmroot/libdex'...
$ git fetch origin f4c4fc372d4a3d65ecbb5082faa5498ac45fb89e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdex
 * [new ref]         f4c4fc372d4a3d65ecbb5082faa5498ac45fb89e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4c4fc3 Update to 0.4.1 (#2245721)