$ git clone -n https://src.fedoraproject.org/rpms/rust-maybe-rayon.git /var/lib/mock/f45-build-43150-800/root/chroot_tmpdir/scmroot/rust-maybe-rayon
Cloning into '/var/lib/mock/f45-build-43150-800/root/chroot_tmpdir/scmroot/rust-maybe-rayon'...
$ git fetch origin 9b6afeddca0c08aed5f9667f39e82b45cdb7602e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-maybe-rayon
 * [new ref]         9b6afeddca0c08aed5f9667f39e82b45cdb7602e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b6afed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild