$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc-serialize.git /var/lib/mock/f40-build-2653646-66902/root/chroot_tmpdir/scmroot/rust-rustc-serialize
Cloning into '/var/lib/mock/f40-build-2653646-66902/root/chroot_tmpdir/scmroot/rust-rustc-serialize'...
$ git fetch origin 0ee37814ffecf27ce0b0a3ae387de91ab29b20c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc-serialize
 * [new ref]         0ee37814ffecf27ce0b0a3ae387de91ab29b20c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ee3781 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild