$ git clone -n https://src.fedoraproject.org/rpms/bout++.git /var/lib/mock/f42-build-864639-172514/root/chroot_tmpdir/scmroot/bout++
Cloning into '/var/lib/mock/f42-build-864639-172514/root/chroot_tmpdir/scmroot/bout++'...
$ git fetch origin e651f838cd830267dbc9d75ae8611a836858a928:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bout++
 * [new ref]         e651f838cd830267dbc9d75ae8611a836858a928 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e651f83 Rebuild for petsc-3.22.2 and sundials-7.1.1