Difference between revisions of "Fedora-rpm"

__NOTOC__

= Fedora RPM Build =

== Structure ==

To build an rpm must be created and/or placed different files under `/usr/src/redhat` as follow:

# Spec file with details of name, dependencies, instructions, etc and script of how to build the rpm under `SPEC` folder

# Compressed file with the sources under `SOURCES` folder

== Build ==

To build the new rpm, run the command:

<pre><nowiki>

# rpmbuild -ba SPEC/newrpm.spec

</nowiki></pre>

The created files will be placed as follow:

# New RPM created under `RPMS/''system_architecture''` folder

# RPM with sources and spec file packed under `SRPMS` folder

# Unpacked sources under `BUILD` folder

== Scripts ==

There are 4 types of scripts:

# Pre install: pre

# Post install: post

# Pre uninstall: preun

# Post uninstall: postun

The `rpm` command has 3 main types of execution to be considered:

# install

<pre><nowiki>

rpm -i newrpm.rpm

</nowiki></pre>

# upgrade

<pre><nowiki>

rpm -u newrpm.rpm

</nowiki></pre>

# remove

<pre><nowiki>

rpm -e newrpm.rpm

</nowiki></pre>

and different values are passed to each script based on which type of execution is performed by the `rpm` command.

More details on [[http://www.ibm.com/developerworks/library/l-rpm3.html]]

<pre><nowiki>#!wiki warning

'''warning'''

Be careful with the usage of each script section, please note the execution order which is crucial at upgrade time.

</nowiki></pre>

==== New installation ====

The execution order and values passed are:

* %pre NEW_PACKAGE ($1 = 1)

* %install

* %post NEW_PACKAGE ($1 = 1)

==== Upgrade ====

The execution order and values passed are:

* %pre NEW_PACKAGE ($1 = 2)

* %install

* %post NEW_PACKAGE ($1 = 2)

* %preun OLD_PACKAGE ($1 = 1)

* %files NEW_PACKAGE, Delete all files no longer listed

* %postun OLD_PACKAGE($1 = 1)

==== Remove ====

The execution order and values passed are:

* %preun OLD_PACKAGE ($1 = 0)

* %files OLD_PACKAGE, Delete all files listed

* %postun OLD_PACKAGE ($1 = 0)