$ git clone -n https://src.fedoraproject.org/rpms/wmCalClock.git /var/lib/mock/f45-build-38434-724/root/chroot_tmpdir/scmroot/wmCalClock
Cloning into '/var/lib/mock/f45-build-38434-724/root/chroot_tmpdir/scmroot/wmCalClock'...
$ git fetch origin e4a93eac18203114f4b5d206eded229e87a4480d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wmCalClock
 * [new ref]         e4a93eac18203114f4b5d206eded229e87a4480d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4a93ea Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild