$ git clone -n https://src.fedoraproject.org/rpms/vfrnav.git /var/lib/mock/f38-build-side-42-init-devel-1348243-30695/root/chroot_tmpdir/scmroot/vfrnav
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1348243-30695/root/chroot_tmpdir/scmroot/vfrnav'...
$ git fetch origin 31418e9c83acb1b2d4940860335dd8b1d7dd72c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vfrnav
 * [new ref]         31418e9c83acb1b2d4940860335dd8b1d7dd72c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31418e9 rebuild for new libgps