$ git clone -n https://src.fedoraproject.org/rpms/rust-matchers.git /var/lib/mock/f45-build-43131-800/root/chroot_tmpdir/scmroot/rust-matchers
Cloning into '/var/lib/mock/f45-build-43131-800/root/chroot_tmpdir/scmroot/rust-matchers'...
$ git fetch origin a37afd3ad0739603833d9c7e7c1b82599a0a3853:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-matchers
 * [new ref]         a37afd3ad0739603833d9c7e7c1b82599a0a3853 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a37afd3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild