[Spacewalk-list] rhnreg_ks in kickstart

[robin lus]

I want to kickstart Centos 5 and have it registered automatically to spacewalk 
(1.4)

=ERROR in ks-rhn-post.log
/tmp/ks-script-KOlpXy: line 128: rhnreg_ks: command not found
/tmp/ks-script-KOlpXy: line 134: rhn_check: command not found

 rhnreg_ks command depending on lot of  rpms: 
rhn-setup,rhn-client-tools, rhnsd,python-dmidecode .... etc
But looking at the kickstart file, it only installs 3 rpms: rhnlib 
libxml2-python,pyOpenSSL

=========
wget -P /tmp/rhn_rpms/optional 
http://rhs.example.com/download/package/a2aee7e02daa930974a2e49c6520d0dca9682ad0/0/1/2662/rhnlib-2.5.39-1.el5.noarch.rpm
http://rhs.example.com/download/package/39a4054951e42d1bc54d587753ae280781e71478/0/1/2661/libxml2-python-2.6.26-2.1.2.8.el5_5.1.i386.rpm
m 
http://rhs.example.com/download/package/3b96f749e282b785d1dcacc99fd0bd0b0a99f9f3/0/1/1068/pyOpenSSL-0.6-1.p24.7.2.2.i386.rpm

rpm -Uvh --replacepkgs --replacefiles /tmp/rhn_rpms/optional/pyOpenSSL* 
/tmp/rhn_rpms/optional/rhnlib* /tmp/rhn_rpms/optional/libxml2-python*

=========

I can add rhnreg_ks dependences to software list in addition to @base, But I 
want to know the right  way.