/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-sysinit is in ltsp-server 5.4.2-6+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | case "$MODE" in
after-install)
echo "# LTSP5 NFS root remount for [partially] rw" >> "$ROOT"/etc/sysconfig/init
echo "REMOUNT_ROOTFS_RW_COMMAND=/etc/rc.d/scripts/ltsp-client-bind-mounts" >> "$ROOT"/etc/sysconfig/init
;;
esac
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