$ git clone -n https://src.fedoraproject.org/rpms/rustup.git /var/lib/mock/f40-build-2556348-62038/root/chroot_tmpdir/scmroot/rustup
Cloning into '/var/lib/mock/f40-build-2556348-62038/root/chroot_tmpdir/scmroot/rustup'...
$ git fetch origin 39255e98a3d25f72196342d81664f62145c79f9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rustup
 * [new ref]         39255e98a3d25f72196342d81664f62145c79f9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39255e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild