$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-untagged.git /var/lib/mock/f40-build-2556239-62038/root/chroot_tmpdir/scmroot/rust-serde-untagged
Cloning into '/var/lib/mock/f40-build-2556239-62038/root/chroot_tmpdir/scmroot/rust-serde-untagged'...
$ git fetch origin 85db59f03217ecb421cee4244f178de84cbb1bb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-untagged
 * [new ref]         85db59f03217ecb421cee4244f178de84cbb1bb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85db59f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild