$ git clone -n https://src.fedoraproject.org/rpms/hydrogen.git /var/lib/mock/f41-build-766294-13472/root/chroot_tmpdir/scmroot/hydrogen
Cloning into '/var/lib/mock/f41-build-766294-13472/root/chroot_tmpdir/scmroot/hydrogen'...
$ git fetch origin 704db0dbc67d06902f5ca296eb9d242961c6a599:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hydrogen
 * [new ref]         704db0dbc67d06902f5ca296eb9d242961c6a599 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 704db0d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild