Delve into the Debian package ecosystem, learn about repositories, package tools, and build packages using the fpm tool, enhancing your deployment skills and integration efficiency.

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Packages are fundamental units of software deployment in Debian and related operating systems. Packaging enables users to deploy your packages using the built-in tools of their operating system.

In this course, you’ll learn about the environment that Debian packages live in, including repositories, package management installation tools, source and binary packages, and the “upstream” concept. Then you’ll learn about the structure and metadata of packages and an efficient way to build Debian packages using the fpm tool. You’ll also learn to use the Debian Build System, including the tools used to create package skeletons and multiple packages from a single code base. You’ll finish with an introduction to repository and package management and integrity.

By the end of this course, you’ll have learned about the Debian package ecosystem and several ways to build and package. This will enable you to seamlessly integrate your packages into existing infrastructure and take your deployment skills to the next level.

Building Debian Packages from the Ground Up

# Task

In this exercise, you are required to create multiple binary packages (`calculate-average` and `calculate-average-data`) from one source package (`calculate-average`) using separate install targets.

* You are given a `scores` file with the content consisting of numbers on each line. 

* You are also given a `calculate-average.c` file, which reads the numbers from the `scores` file and calculates their average. If the `scores` file is empty, it prints a message informing the user of that and displays the message `No file found` if no such file exists. 

To complete the task, you need to perform the following steps:

1. In the `Makefile`, add statements to install the files `calculate-average` and `scores` separately to the location where they are expected to be found by `dh_builddeb`.

2. Make the necessary changes, if any in the `control` and `rules` files of the `calculate-average/debian` directory to build the packages `calculate-average` and `calculate-average-data`.

3. In the `debian/rules` file, override the `dh_auto_install` step to call `make install_binary` and `make install_data` with the appropriate install targets and the locations where the files can be found by `dh_builddeb`.

After these file modifications, perform the following steps:

1. Build and install the `calculate-average-data` package and then the `calculate-average` package.

2. If your package is built successfully, typing `calculate-average` will display an average of the scores present in the file `scores`.

Build multiple packages using separate install targets.

Exercise: Build Multiple Packages Using Separate Install Targets

Introduction

Debian Packages in Context

What's Inside a Debian Package

Quick Package Construction with fpm

The Debian Build System

Quick Debian Packaging and Multipackage Builds

Repository Management

Conclusion

Appendix

Exercise: Build Multiple Packages Using Separate Install Targets

Task