$ git clone -n https://src.fedoraproject.org/rpms/rust-matrixcompare-core.git /var/lib/mock/f45-build-43141-800/root/chroot_tmpdir/scmroot/rust-matrixcompare-core
Cloning into '/var/lib/mock/f45-build-43141-800/root/chroot_tmpdir/scmroot/rust-matrixcompare-core'...
$ git fetch origin e1de2064fc88f20ad8cf2596704a23df0d9110bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-matrixcompare-core
 * [new ref]         e1de2064fc88f20ad8cf2596704a23df0d9110bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1de206 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild