$ git clone -n https://src.fedoraproject.org/rpms/vfrnav.git /var/lib/mock/f40-build-1209575-22540/root/chroot_tmpdir/scmroot/vfrnav
Cloning into '/var/lib/mock/f40-build-1209575-22540/root/chroot_tmpdir/scmroot/vfrnav'...
$ git fetch origin d8871249268dedc9dc98b4b5d0cb9f2ce62561ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vfrnav
 * [new ref]         d8871249268dedc9dc98b4b5d0cb9f2ce62561ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d887124 Rebuild (geos)