$ git clone -n https://src.fedoraproject.org/rpms/tcmu-runner.git /var/lib/mock/f45-build-36858-708/root/chroot_tmpdir/scmroot/tcmu-runner
Cloning into '/var/lib/mock/f45-build-36858-708/root/chroot_tmpdir/scmroot/tcmu-runner'...
$ git fetch origin 77b7bee2036d1aaaf47ce9e1c158667847c66674:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcmu-runner
 * [new ref]         77b7bee2036d1aaaf47ce9e1c158667847c66674 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77b7bee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild