$ git clone -n https://src.fedoraproject.org/rpms/root.git /var/lib/mock/f40-build-2257556-54325/root/chroot_tmpdir/scmroot/root
Cloning into '/var/lib/mock/f40-build-2257556-54325/root/chroot_tmpdir/scmroot/root'...
$ git fetch origin 40040121b9021fd13242af649095090e71e92877:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/root
 * [new ref]         40040121b9021fd13242af649095090e71e92877 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4004012 Rebuilt for TBB 2021.11