$ git clone -n https://src.fedoraproject.org/rpms/backupninja.git /var/lib/mock/f41-build-side-1-2632197-25777/root/chroot_tmpdir/scmroot/backupninja
Cloning into '/var/lib/mock/f41-build-side-1-2632197-25777/root/chroot_tmpdir/scmroot/backupninja'...
$ git fetch origin 29c175407c7e3049862859d3ec9e65f591be5838:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/backupninja
 * [new ref]         29c175407c7e3049862859d3ec9e65f591be5838 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29c1754 convert GPLv2 license to SPDX