$ git clone -n https://src.fedoraproject.org/rpms/rust-ref-cast.git /var/lib/mock/f40-build-2657860-66917/root/chroot_tmpdir/scmroot/rust-ref-cast
Cloning into '/var/lib/mock/f40-build-2657860-66917/root/chroot_tmpdir/scmroot/rust-ref-cast'...
$ git fetch origin 2caaa3652005b4aaef3fb4afbb0a1d34b70ab649:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ref-cast
 * [new ref]         2caaa3652005b4aaef3fb4afbb0a1d34b70ab649 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2caaa36 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild