Merge #985

985: Permit raspberry pi (and other architectures) builds r=mergify[bot] a=abondis

## What type of PR?

Enhancement

## What does this PR do?

Add an option to select base images and permit building for different CPU architectures.

### Related issue(s)
N/A

## Prerequistes

- [X] documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.


Co-authored-by: Aurélien Bondis <aurelien.bondis@gmail.com>
Co-authored-by: Aurelien <aurelien.bondis@gmail.com>

.gitignore

@@ -13,3 +13,4 @@ pip-selfcheck.json
 /docker-compose.yml
 /.idea
 /.vscode
+qemu-arm-static

core/admin/Dockerfile

@@ -1,5 +1,8 @@
 # First stage to build assets
-FROM node:8 as assets
+ARG DISTRO=alpine:3.10
+ARG ARCH=""
+FROM ${ARCH}node:8 as assets
+COPY --from=balenalib/rpi-alpine:3.10 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
 
 COPY package.json ./
 RUN npm install
@@ -11,7 +14,7 @@ RUN mkdir static \
 
 
 # Actual application
-FROM alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
@@ -41,4 +44,3 @@ ENV FLASK_APP mailu
 CMD /start.py
 
 HEALTHCHECK CMD curl -f -L http://localhost/ui/login?next=ui.index || exit 1
-

core/dovecot/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \

core/nginx/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \

core/none/Dockerfile

@@ -1,5 +1,6 @@
 # This is an idle image to dynamically replace any component if disabled.
 
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 
 CMD sleep 1000000d

core/postfix/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \

docs/Dockerfile

@@ -1,12 +1,13 @@
-FROM python:3-alpine
+ARG DISTRO=alpine:3.8
+FROM $DISTRO
 
 COPY requirements.txt /requirements.txt
 
 ARG version=master
 ENV VERSION=$version
 
-RUN pip install -r /requirements.txt \
+RUN apk add --no-cache nginx curl python3 \
- && apk add --no-cache nginx curl \
+ && pip3 install -r /requirements.txt \
  && mkdir /run/nginx
 
 COPY ./nginx.conf /etc/nginx/conf.d/default.conf

docs/rpi_build.rst

@@ -0,0 +1,25 @@
+.. _rpi_build:
+
+Building for a Raspberry Pi
+===========================
+
+The build does not need to be done on the Pi.
+
+To do so, go to ``tests/`` and call ``./build_arm.sh``, it will build all
+necessary images for arm.
+
+To push the locally built images to a remote server, run ``./deploy_to_pi.sh``.
+Docker 18.09+ is needed to use ``-H ssh://<user>@<host>``.
+
+Adjustments
+-----------
+
+``build_arm.sh`` uses some variables passed as ``build-arg`` to docker-compose:
+
+- ``ALPINE_VER``: version of ALPINE to use
+- ``DISTRO``: is the main distro used. Dockerfiles are set on Alpine 3.10, and
+  build script overrides for ``balenalib/rpi-alpine:3.10``
+- ``QEMU``: Used by webmails dockerfiles. It will add ``qemu-arm-static`` only
+  if ``QEMU`` is set to ``arm``
+- ``ARCH``: Architecture to use for ``admin``, and ``webmails`` as their images
+  are available for those architectures.

docs/setup.rst

@@ -19,9 +19,7 @@ Prepare the environment
 
 Mailu images are designed to work on x86 or equivalent hardware, so it
 should run on pretty much any cloud server as long as enough power is
-provided. If you find yourself running Mailu on small hardware, e.g.
+provided. For non x86 machines, see :ref:`rpi_build`
-Raspberry Pi or other platforms based on ARM, you will probably find
-some support from `MFAshby's fork`_.
 
 You are free to choose any operating system that runs Docker (>= 1.11),
 then chose between various flavors including Docker Compose, Kubernetes
@@ -34,7 +32,6 @@ You should also have at least a DNS hostname and a DNS name for receiving
 emails. Some instructions are provided on the matter in the article
 :ref:`dns_setup`.
 
-.. _`MFAshby's fork`: https://github.com/MFAshby/Mailu
 
 Pick a Mailu version
 --------------------

optional/clamav/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash \

optional/postgresql/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash \

optional/radicale/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 
 RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
  && apk add --no-cache radicale@testing curl bash

services/fetchmail/Dockerfile

@@ -1,5 +1,6 @@
 # First stage: Build
-FROM alpine:3.10 as builder
+ARG DISTRO=alpine:3.10
+FROM $DISTRO as builder
 
 # build dependencies
 RUN apk add --no-cache curl tar xz autoconf git gettext build-base openssl openssl-dev
@@ -10,7 +11,8 @@ RUN cd fetchmail-7.0.0-alpha6 && \
     ./configure --with-ssl --prefix /usr/local --disable-nls && \
     make
 
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 
 # python3 shared with most images
 RUN apk add --no-cache \

services/rspamd/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \

services/unbound/Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine:3.10
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \

setup/Dockerfile

@@ -1,11 +1,12 @@
-FROM python:3-alpine
+ARG DISTRO=alpine:3.10
+FROM $DISTRO
 
 RUN mkdir -p /app
 WORKDIR /app
 
 COPY requirements.txt requirements.txt
-RUN apk add --no-cache curl \
+RUN apk add --no-cache curl python3 py3-pip \
- && pip install -r requirements.txt
+    && pip3 install -r requirements.txt
 
 COPY server.py ./server.py
 COPY main.py ./main.py

tests/build_arm.sh

@@ -0,0 +1,15 @@
+#!/bin/bash -x
+
+ALPINE_VER="3.10"
+DISTRO="balenalib/rpi-alpine:$ALPINE_VER"
+# Used for webmails
+QEMU="arm"
+ARCH="arm32v7/"
+
+# use qemu-*-static from docker container
+docker run --rm --privileged multiarch/qemu-user-static:register 
+docker-compose -f build.yml build \
+  --build-arg DISTRO=$DISTRO \
+  --build-arg ARCH=$ARCH \
+  --build-arg QEMU=$QEMU \
+  --parallel $@

tests/deploy_to_pi.sh

@@ -0,0 +1,6 @@
+#!/bin/bash -x
+# Small script to deploy locally built images to a remote docker
+compose_options=$1
+images=$(docker-compose $1 images  | awk 'NR > 2 { printf $2":"$3" " }')
+docker save $images | pigz  - > mail.local.tgz
+echo "now run 'docker -H \"ssh://user@host\" load -i mail.local.tgz"

towncrier/newsfragments/985.feature

@@ -0,0 +1 @@
+Add options to support different architectures builds

webmails/rainloop/Dockerfile

@@ -1,4 +1,13 @@
-FROM php:7.3-apache
+ARG ARCH=""
+ARG QEMU=other
+
+# NOTE: only add file if building for arm
+FROM ${ARCH}php:7.3-apache as build_arm
+ONBUILD COPY --from=balenalib/rpi-alpine:3.10 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
+
+FROM ${ARCH}php:7.3-apache as build_other
+
+FROM build_${QEMU}
 #Shared layer between rainloop and roundcube
 RUN apt-get update && apt-get install -y \
   python3 curl python3-pip git \

webmails/roundcube/Dockerfile

@@ -1,4 +1,12 @@
-FROM php:7.3-apache
+# NOTE: only add file if building for arm
+ARG ARCH=""
+ARG QEMU=other
+FROM ${ARCH}php:7.3-apache as build_arm
+ONBUILD COPY --from=balenalib/rpi-alpine:3.10 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
+
+FROM ${ARCH}php:7.3-apache as build_other
+
+FROM build_${QEMU}
 #Shared layer between rainloop and roundcube
 RUN apt-get update && apt-get install -y \
   python3 curl python3-pip git \