$ git clone -n https://src.fedoraproject.org/rpms/diffstat.git /var/lib/mock/f45-build-7522-365/root/chroot_tmpdir/scmroot/diffstat
Cloning into '/var/lib/mock/f45-build-7522-365/root/chroot_tmpdir/scmroot/diffstat'...
$ git fetch origin 0f59e62961f403e714a9a3345614da48f05d2bed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diffstat
 * [new ref]         0f59e62961f403e714a9a3345614da48f05d2bed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f59e62 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild