$ git clone -n https://src.fedoraproject.org/rpms/rust-wu-diff.git /var/lib/mock/f45-build-46244-832/root/chroot_tmpdir/scmroot/rust-wu-diff
Cloning into '/var/lib/mock/f45-build-46244-832/root/chroot_tmpdir/scmroot/rust-wu-diff'...
$ git fetch origin 90bef5c1713ca1904b5e70b0ccd28c404626d9d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-wu-diff
 * [new ref]         90bef5c1713ca1904b5e70b0ccd28c404626d9d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90bef5c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild