Revision as of 23:48, 27 May 2011

Fedora RPM Build

Structure

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

1. Spec file with details of name, dependencies, instructions, etc and script of how to build the rpm under `SPEC` folder
2. Compressed file with the sources under `SOURCES` folder

Build

To build the new rpm, run the command:

 # rpmbuild -ba SPEC/newrpm.spec
 

The created files will be placed as follow:

1. New RPM created under `RPMS/system_architecture` folder
2. RPM with sources and spec file packed under `SRPMS` folder
3. Unpacked sources under `BUILD` folder

Scripts

There are 4 types of scripts:

1. Pre install: pre
2. Post install: post
3. Pre uninstall: preun
4. Post uninstall: postun

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

1. install

 rpm -i newrpm.rpm
 

1. upgrade

 rpm -u newrpm.rpm
 

1. remove

 rpm -e newrpm.rpm
 

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

More details on [[1]]

#!wiki warning
'''warning'''

 * Be careful with the usage of each script section, please note the execution order which is crucial at upgrade time.
 * When importing specs from other distros use remove `%` in from of `make`

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)`