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 <H1>LON-CAPA Software Developer Instructions</H1>  <H1>LON-CAPA Software Developer Instructions</H1>
   <BR><I>Written by Scott Harrison, January 17, 2001</I>
   <BR><I>Last updated, January 17, 2001</I>
 <OL>  <OL>
 <LI><A HREF="#Using_CVS">Using CVS</A>  <LI><A HREF="#Using_CVS">Using CVS</A>
 <UL>  <UL>
Line 152  alwaysrun: Line 153  alwaysrun:
 <LI><A NAME="loncapafiles">  <LI><A NAME="loncapafiles">
     <H2>Adding/removing files from the LON-CAPA installation (doc/loncapafiles/loncapafiles.html)</H2>      <H2>Adding/removing files from the LON-CAPA installation (doc/loncapafiles/loncapafiles.html)</H2>
 <STRONG>To add and remove (and alter)</STRONG>  <STRONG>To add and remove (and alter)</STRONG>
   <P>
 All that you have to do to alter the behavior of the installation is  All that you have to do to alter the behavior of the installation is
 edit a single file (<TT>doc/loncapafiles/loncapafiles.html</TT>).  edit a single file (<TT>doc/loncapafiles/loncapafiles.html</TT>).
 Adding, removing, and altering files requires proper attention  Adding, removing, and altering files requires proper attention
 to the syntax of file format of course.  to the syntax of file format of course.
   </P>
 <STRONG>File Format</STRONG>  <STRONG>File Format</STRONG>
 <P>  <P>
 The preceding <A HREF=#"makebuild">"make build"</A> documentation  The preceding <A HREF=#"makebuild">"make build"</A> documentation
Line 248  combination has been working very effici Line 251  combination has been working very effici
 </P>  </P>
 <LI><A NAME="configversusnonconfig">  <LI><A NAME="configversusnonconfig">
     <H2>Configurable files versus non-configurable files</H2>      <H2>Configurable files versus non-configurable files</H2>
   <STRONG>Machine-specific information is the difference</STRONG>
   <P>
   The current list of configurable files for the LON-CAPA system is
   /etc/httpd/access.conf.
   All of these configurable files contain machine-specific information.
   For instance, the LON-CAPA system relies on unique host IDs such
   as msua3, s1, s2, msul1, and 103a1 (specified as a "PerlSetVar lonHostID"
   field within /etc/httpd/access.conf).
   Non-configurable files simply do NOT have machine-specific information.
   <STRONG>The impact on updating software</STRONG>
   <P>
   What this means in terms of software updating is that
   <UL>
   <LI>non-configurable files can be simply overwritten with newer versions
   (without "anything" else to worry about),
   <LI>and configurable files must follow these steps to be safely overwritten
   <OL>
   <LI>have their machine specific information saved,
   <LI>be overwritten, and then
   <LI>have their machine specific information restored.
   </UL>
   </P>
 <LI><A NAME="makeinstall">  <LI><A NAME="makeinstall">
     <H2>Updating the non-configurable files on your machine (make install)</H2>      <H2>Updating the non-configurable files on your machine (make install)</H2>
   
   
 <LI><A NAME="makeconfiginstall">  <LI><A NAME="makeconfiginstall">
     <H2>Updating the configurable files on your machine (make configinstall)</H2>      <H2>Updating the configurable files on your machine (make configinstall)</H2>
   
   
 <LI><A NAME="makeRPM">  <LI><A NAME="makeRPM">
     <H2>Building RPMs (make RPM)</H2>      <H2>Building RPMs (make RPM)</H2>
 </OL>  </OL>
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