$ git clone -n https://src.fedoraproject.org/rpms/rust-derive_more.git /var/lib/mock/f40-build-2659451-66918/root/chroot_tmpdir/scmroot/rust-derive_more
Cloning into '/var/lib/mock/f40-build-2659451-66918/root/chroot_tmpdir/scmroot/rust-derive_more'...
$ git fetch origin 076df76661ded69b0aae692010cefe6e94449d39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive_more
 * [new ref]         076df76661ded69b0aae692010cefe6e94449d39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 076df76 Regenerate with rust2rpm v24