$ git clone -n https://src.fedoraproject.org/rpms/R-lokern.git /var/lib/mock/f40-build-789482-135730/root/chroot_tmpdir/scmroot/R-lokern
Cloning into '/var/lib/mock/f40-build-789482-135730/root/chroot_tmpdir/scmroot/R-lokern'...
$ git fetch origin fa45ecdb26f56e31693d9978d512e7d6fb350134:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lokern
 * [new ref]         fa45ecdb26f56e31693d9978d512e7d6fb350134 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa45ecd Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild