$ git clone -n https://src.fedoraproject.org/rpms/rust-matrixcompare-mock.git /var/lib/mock/f45-build-43137-800/root/chroot_tmpdir/scmroot/rust-matrixcompare-mock
Cloning into '/var/lib/mock/f45-build-43137-800/root/chroot_tmpdir/scmroot/rust-matrixcompare-mock'...
$ git fetch origin e0ef6e30fb3d29db203575b6324a1a94dfb01930:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-matrixcompare-mock
 * [new ref]         e0ef6e30fb3d29db203575b6324a1a94dfb01930 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0ef6e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild