$ git clone -n https://src.fedoraproject.org/rpms/R-cliapp.git /var/lib/mock/f45-build-6010-345/root/chroot_tmpdir/scmroot/R-cliapp
Cloning into '/var/lib/mock/f45-build-6010-345/root/chroot_tmpdir/scmroot/R-cliapp'...
$ git fetch origin f358d01f70d9a384710ae69b1fd718a320c0900c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cliapp
 * [new ref]         f358d01f70d9a384710ae69b1fd718a320c0900c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f358d01 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild