$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-options.git /var/lib/mock/f40-build-2477679-61604/root/chroot_tmpdir/scmroot/rust-cargo-options
Cloning into '/var/lib/mock/f40-build-2477679-61604/root/chroot_tmpdir/scmroot/rust-cargo-options'...
$ git fetch origin 831b62e815b8d718f583714ee9a5fa6a5fc0943a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-options
 * [new ref]         831b62e815b8d718f583714ee9a5fa6a5fc0943a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 831b62e Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild