$ git clone -n https://src.fedoraproject.org/rpms/rust-matrixcompare.git /var/lib/mock/f45-build-43134-800/root/chroot_tmpdir/scmroot/rust-matrixcompare
Cloning into '/var/lib/mock/f45-build-43134-800/root/chroot_tmpdir/scmroot/rust-matrixcompare'...
$ git fetch origin 5447a8bfadc72d6e12636a911e6048c6f399ffb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-matrixcompare
 * [new ref]         5447a8bfadc72d6e12636a911e6048c6f399ffb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5447a8b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild