Docker can be used to set up a clean build environment for Debian packaging. This tutorial shows how to create a container with required build tools and how to use it to build packages.
For more complete solution with many improvements see container-deb-builder.
Start by building a container that will act as package build environment:
docker build -t docker-deb-builder:17.04 -f Dockerfile-ubuntu-17.04 .
In this example the target is Ubuntu 17.04 but you can create and
modify Dockerfile-nnn to match your target environment.
First download or git clone the source code of the package you are building:
git clone ... ~/my-package-source
The source code should contain subdirectory called debian with at
least a minimum set of packaging files: control, copyright,
changelog and rules.
Clone the docker-deb-builder (the repository you are reading now) and run the build script to see usage:
$ ./build
usage: build [options...] SOURCEDIR
Options:
-i IMAGE Name of the docker image (including tag) to use as package build environment.
-o DIR Destination directory to store packages to.
-d DIR Directory that contains other deb packages that need to be installed before build.
To build Debian packages run following commands:
# create destination directory to store the build results
mkdir output
# build package from source directory
./build -i docker-deb-builder:17.04 -o output ~/my-package-source
After successful build you will find the .deb files in output
directory.
Sometimes build might require dependencies that cannot be installed with
apt-get build-dep. You can install them into the build environment
by passing option -d DIR where DIR is a directory with *.deb files
in it.
./build -i docker-deb-builder:17.04 -o output -d dependencies ~/my-package-source
In this tutorial all package-specific build dependencies are installed from scratch each time build is executed in the container. The benefit is that the container is generic and reusable for building any package but the installation of build-time dependencies can add up to considerable overhead, both in time and bandwidth. This overhead may not be acceptable when building packages as part of continuous integration pipeline. One possible solution to reduce overhead is to install package-specific build dependencies into build environment container.
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