$ git clone -n https://src.fedoraproject.org/rpms/vfrnav.git /var/lib/mock/f41-build-1037825-18818/root/chroot_tmpdir/scmroot/vfrnav
Cloning into '/var/lib/mock/f41-build-1037825-18818/root/chroot_tmpdir/scmroot/vfrnav'...
$ git fetch origin d7415395979ba2c386b9bc36e50a2723ebec0f75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vfrnav
 * [new ref]         d7415395979ba2c386b9bc36e50a2723ebec0f75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d741539 Rebuild (geos)