$ git clone -n https://src.fedoraproject.org/rpms/osgearth.git /var/lib/mock/f42-build-863026-171338/root/chroot_tmpdir/scmroot/osgearth
Cloning into '/var/lib/mock/f42-build-863026-171338/root/chroot_tmpdir/scmroot/osgearth'...
$ git fetch origin 8f3f9d162a04a62df182db9d13a62e9b2c4d921a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/osgearth
 * [new ref]         8f3f9d162a04a62df182db9d13a62e9b2c4d921a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f3f9d1 Rebuild (GDAL)