$ git clone -n https://src.fedoraproject.org/rpms/kf5-kpackage.git /var/lib/mock/f45-build-14902-465/root/chroot_tmpdir/scmroot/kf5-kpackage
Cloning into '/var/lib/mock/f45-build-14902-465/root/chroot_tmpdir/scmroot/kf5-kpackage'...
$ git fetch origin 051378a70d9a10f133536fa114c5b7462f363daf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kpackage
 * [new ref]         051378a70d9a10f133536fa114c5b7462f363daf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 051378a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild