$ git clone -n https://src.fedoraproject.org/rpms/cpphs.git /var/lib/mock/f38-build-side-42-init-devel-879363-28483/root/chroot_tmpdir/scmroot/cpphs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-879363-28483/root/chroot_tmpdir/scmroot/cpphs'...
$ git fetch origin 064ff83fe19870b9e75eaa076ccda1defa6d7e1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpphs
 * [new ref]         064ff83fe19870b9e75eaa076ccda1defa6d7e1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 064ff83 bump release