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 the tool `dh_install`.

* 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 and displays the message `No file found` in case no such file exists. 

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

1. In the `Makefile`, add statements to install the `calculate-average` binary and `scores` data file separately.

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

3. Write to the two `.install` files in the `debian/` directory and specify the relevant relative paths.

After these file modifications, perform the following steps:

1. Ensure that the `*.install` files are not executable by running `chmod -x <filename>`. 

2. Enter the commands to build the `.deb` packages.

3. Once the Debian packages are built, install the `calculate-average-data` package first and then install the `calculate-average` package.

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

# 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 the tool `dh_install`.

* 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 and displays the message `No file found` in case no such file exists. 

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

1. In the `Makefile`, add statements to install the `calculate-average` binary and `scores` data file separately.

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

3. Write to the two `.install` files in the `debian/` directory and specify the relevant relative paths.

After these file modifications, perform the following steps:

1. Ensure that the `*.install` files are not executable by running `chmod -x <filename>`. 

2. Enter the commands to build the `.deb` packages.

3. Once the Debian packages are built, install the `calculate-average-data` package first and then install the `calculate-average` package.

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

Build and install multiple packages using the dh_install tool.

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 dh_install

Task