$ git clone -n https://src.fedoraproject.org/rpms/rust-self_cell.git /var/lib/mock/f39-build-1494628-34542/root/chroot_tmpdir/scmroot/rust-self_cell
Cloning into '/var/lib/mock/f39-build-1494628-34542/root/chroot_tmpdir/scmroot/rust-self_cell'...
$ git fetch origin 5a6939c7032fa8a5c8884c81291e93fc4578bd2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-self_cell
 * [new ref]         5a6939c7032fa8a5c8884c81291e93fc4578bd2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a6939c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild