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><A
NAME="rpm">6. Allways Provide RPM Packages of Your Softwares</H1
><P
>This is extremely important for many reasons:</P
><P
></P
><OL
TYPE="1"
><LI
><P
>Ease-of-use. This is allways the primordial motivation.</P
></LI
><LI
><P
>Automates some tasks that must be made before and after the installation of your Software. Again bringing ease-of-use.</P
></LI
><LI
><P
>Intelligently manages configuration files, documentation etc, providing more control in an upgrade</P
></LI
><LI
><P
>Manages interdependencies with other packages and versions, guaranteeing good functionality.</P
></LI
><LI
><P
>Lets you distribute Software with your company's digital signature, and makes integrity checks (<SPAN
CLASS="acronym"
>MD5</SPAN
>) in each file, guaranteeing precedence, and reporting unwanted file modification.</P
></LI
><LI
><P
>Provides tools to let interact with your graphic installer.</P
></LI
></OL
><P
>But a good package is not only put together your files in a RPM. <SPAN
CLASS="acronym"
>FHS</SPAN
> must be followed, configuration and documentation files must be marked as is, and pre- and post-install scripts must be robust, to not let them damage the system (remember that installation processes is done by root).</P
><P
>Know well RPM because it can bring much power and facilities to you and your user. There are a lot of documentation available about RPM on the Internet:</P
><P
></P
><UL
COMPACT="COMPACT"
><LI
><P
>The book <A
HREF="http://www.redhat.com/docs/books/max-rpm/"
TARGET="_top"
>Maximum RPM</A
>, also available <A
HREF="http://www.rpm.org/max-rpm/"
TARGET="_top"
>on-line</A
> and in printable <A
HREF="http://www.rpm.org/local/maximum-rpm.ps.gz"
TARGET="_top"
>PostScript</A
> format.</P
></LI
><LI
><P
><A
HREF="http://www.rpm.org/RPM-HOWTO/"
TARGET="_top"
>RPM-HOWTO</A
> which is smaller and more straight-forward.</P
></LI
><LI
><P
><A
HREF="http://www.rpm.org/"
TARGET="_top"
>www.rpm.org</A
></P
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><H2
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><A
NAME="module">6.1. Software Package Modularization</H2
><P
>You should give user the option to install only the part of your Software he wants. Imagine your Software has a client part and a server part, and both use files and libraries in common. You should break them in 3 RPMs. For instance, lets say the name of your product is <EM
>MyDB</EM
>, so you'll provide the packages:</P
><P
></P
><OL
TYPE="1"
><LI
><P
><TT
CLASS="filename"
>MyDB-common-1.0-3.i386.rpm</TT
></P
></LI
><LI
><P
><TT
CLASS="filename"
>MyDB-server-1.0-3.i386.rpm</TT
></P
></LI
><LI
><P
><TT
CLASS="filename"
>MyDB-client-1.0-3.i386.rpm</TT
></P
></LI
></OL
><P
>and last 2 packages depends on the first. If the user is installing a client profile, he will use:</P
><P
></P
><OL
TYPE="1"
><LI
><P
><TT
CLASS="filename"
>MyDB-common-1.0-3.i386.rpm</TT
></P
></LI
><LI
><P
><TT
CLASS="filename"
>MyDB-client-1.0-3.i386.rpm</TT
></P
></LI
></OL
><P
>If he is installing a server profile:</P
><P
></P
><OL
TYPE="1"
><LI
><P
><TT
CLASS="filename"
>MyDB-common-1.0-3.i386.rpm</TT
></P
></LI
><LI
><P
><TT
CLASS="filename"
>MyDB-server-1.0-3.i386.rpm</TT
></P
></LI
></OL
><P
>This approach will help the user save disk space, and be aware of how your Software is organized.</P
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