$ git clone -n https://src.fedoraproject.org/rpms/xastir.git /var/lib/mock/f40-build-2131701-50807/root/chroot_tmpdir/scmroot/xastir
Cloning into '/var/lib/mock/f40-build-2131701-50807/root/chroot_tmpdir/scmroot/xastir'...
$ git fetch origin 8b6db8ac7afcc0d619e83e2e9045bfa1e7495127:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xastir
 * [new ref]         8b6db8ac7afcc0d619e83e2e9045bfa1e7495127 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b6db8a Rebuild (shapelib)