$ git clone -n https://src.fedoraproject.org/rpms/rust-speculoos.git /var/lib/mock/f45-build-45164-821/root/chroot_tmpdir/scmroot/rust-speculoos
Cloning into '/var/lib/mock/f45-build-45164-821/root/chroot_tmpdir/scmroot/rust-speculoos'...
$ git fetch origin 40a5b0c7315a2618e3ee1f5b787aa7994b52bbed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-speculoos
 * [new ref]         40a5b0c7315a2618e3ee1f5b787aa7994b52bbed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40a5b0c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild