$ git clone -n https://src.fedoraproject.org/rpms/ddclient.git /var/lib/mock/f41-build-side-1-2646033-27211/root/chroot_tmpdir/scmroot/ddclient
Cloning into '/var/lib/mock/f41-build-side-1-2646033-27211/root/chroot_tmpdir/scmroot/ddclient'...
$ git fetch origin b12bce988a9b27b64d73723d8131a7876939794f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ddclient
 * [new ref]         b12bce988a9b27b64d73723d8131a7876939794f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b12bce9 convert GPLv2+ license to SPDX