Fedora-rpm

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]]

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)`