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Make README more user-centric and explain CI processes

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Resolves #40 and #48.
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Justin Kromlinger 2020-11-18 18:10:22 +01:00
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# Arch Linux Docker Image
[![pipeline status](https://gitlab.archlinux.org/archlinux/archlinux-docker/badges/master/pipeline.svg)](https://gitlab.archlinux.org/archlinux/archlinux-docker/-/commits/master)
This repository contains all scripts and files needed to create a Docker image for Arch Linux.
Arch Linux provides Docker images both in the [official DockerHub library](https://hub.docker.com/_/archlinux) (`docker pull library/archlinux:latest`) and in our [own repository](https://hub.docker.com/r/archlinux/archlinux) (`docker pull archlinux/archlinux:latest`).
## Dependencies
Images in the official library are updated weekly while our own repository is updated daily.
Two versions of the image are provided: `base` (~160MB) and `base-devel` (~240MB), containing the respective meta package / package group. Both are available as tags with `latest` pointing to `base`. Additionally, images are tagged with their date and build job number, f.e. `base-devel-20201118.0.9436`.
While the images are regularly kept up to date it is strongly recommended running `pacman -Syu` right after starting a container due to the rolling release nature of Arch Linux.
## Principles
* Provide the Arch experience in a Docker image
* Provide the simplest but complete image to `base` and `base-devel` on a regular basis
* `pacman` needs to work out of the box
* All installed packages have to be kept unmodified
## Building your own image
[This repository](https://gitlab.archlinux.org/archlinux/archlinux-docker) contains all scripts and files needed to create a Docker image for Arch Linux.
### Dependencies
Install the following Arch Linux packages:
* make
@ -12,15 +29,23 @@ Install the following Arch Linux packages:
* fakechroot
* fakeroot
Make sure your user can directly interact with Docker (ie. `docker info` works).
Make sure your user can directly interact with Docker (i.e. `docker info` works).
## Usage
Run `make docker-image-base` to build the image `archlinux/archlinux:base` with the
`base` group installed. You can also run `make docker-image-base-devel` to
build the image `archlinux/archlinux:base-devel` with the `base-devel` group installed.
### Usage
Run `make docker-image-base` to build the `archlinux:base` image with the
`base` meta package installed. You can also run `make docker-image-base-devel` to
build the image `archlinux:base-devel` which additionally has the `base-devel` group installed.
## Principles
* Provide the Arch experience in a Docker image
* Provide the most simple but complete image to base every other upon
* `pacman` needs to work out of the box
* All installed packages have to be kept unmodified
## Pipeline
### Daily builds
Daily images are build with scheduled [GitLabCI](https://gitlab.archlinux.org/archlinux/archlinux-docker/-/blob/master/.gitlab-ci.yml) using our own runner infrastructure. Initially root filesystem archives are constructed and provided in our [package registry](https://gitlab.archlinux.org/archlinux/archlinux-docker/-/packages). The released multi-stage Dockerfile downloads those archives and verifies their integrity before unpacking it into a Docker image layer. Images are build using [kaniko](https://github.com/GoogleContainerTools/kaniko) to avoid using privileged Docker containers, which also publishes them to our DockerHub repository.
### Weekly releases
Weekly releases to the official DockerHub library use the same pipeline as daily builds. Updates are provided as automatic [pull requests](https://github.com/docker-library/official-images/pulls?q=is%3Apr+archlinux+is%3Aclosed+author%3Aarchlinux-github) to the [official-images library](https://github.com/docker-library/official-images/blob/master/library/archlinux), whose GitHub pipeline will build the images using our provided rootfs archives and Dockerfiles.
### Development
Changes in Git feature branches are build and tested using the pipeline as well. Development images are uploaded to our [GitLab Container Registry](https://gitlab.archlinux.org/archlinux/archlinux-docker/container_registry).