initial commit

Create Arch Linux ARM images using multi-stage Dockerfile. This
works well with binfmt emulation and allows to generate images
from scratch.

Inspiration taken from:
- https://github.com/archlinux/archlinux-docker
- https://github.com/lopsided98/archlinux

.travis.yml

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+dist: xenial
+language: generic
+sudo: required
+go:
+  - stable
+services:
+  - docker
+install:
+  - go get github.com/estesp/manifest-tool
+  - 'echo ''{ "experimental": true }'' | sudo tee /etc/docker/daemon.json'
+  - sudo systemctl restart docker
+  - sudo apt-get --yes --no-install-recommends install qemu-user-static
+  - sudo su -c 'echo -1 > /proc/sys/fs/binfmt_misc/qemu-arm'
+  - echo ':qemu-arm:M:0:\x7f\x45\x4c\x46\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:CF' | sudo tee -a /proc/sys/fs/binfmt_misc/register
+script:
+  - ./build
+after_success:
+  - '[ "$TRAVIS_PULL_REQUEST" == "false" ] && docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD" && ./push'

Dockerfile

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+FROM agners/archlinuxarm-arm32v7
+
+WORKDIR /archlinux
+
+RUN mkdir -p /archlinux/rootfs
+
+COPY pacstrap-docker /archlinux/
+
+RUN ./pacstrap-docker /archlinux/rootfs \
+	bash sed gzip pacman
+
+# Remove current pacman database, likely outdated very soon
+RUN rm rootfs/var/lib/pacman/sync/*
+
+FROM scratch
+COPY --from=0 /archlinux/rootfs/ /
+COPY rootfs/ /
+
+ENV LANG=en_US.UTF-8
+
+RUN locale-gen
+RUN pacman-key --init
+RUN pacman-key --populate archlinuxarm
+
+CMD ["/usr/bin/bash"]

build

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+#!/bin/bash -ex
+
+DOCKER_ARCH=arm32v7
+DOCKER_ORG=agners
+DOCKER_IMAGE=archlinuxarm-${DOCKER_ARCH}
+
+TAG_DATE=$(date +'%Y%m%d')
+
+docker build -t $DOCKER_ORG/$DOCKER_IMAGE \
+	-t $DOCKER_ORG/$DOCKER_IMAGE:$TAG_DATE .
+

pacstrap-docker

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+#!/bin/bash
+
+(( $# )) || die "No root directory specified"
+newroot=$1; shift
+pacman_args=("${@:-base}")
+
+[[ -d $newroot ]] || die "%s is not a directory" "$newroot"
+
+echo 'Creating install root at %s' "$newroot"
+mkdir -m 0755 -p "$newroot"/var/{cache/pacman/pkg,lib/pacman,log} "$newroot"/{dev,run,etc}
+mkdir -m 1777 -p "$newroot"/tmp
+mkdir -m 0555 -p "$newroot"/{sys,proc}
+
+echo 'Installing packages to %s' "$newroot"
+if ! pacman -r "$newroot" -Sy --noconfirm "${pacman_args[@]}"; then
+  die 'Failed to install packages to new root'
+fi

push

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+#!/bin/bash -ex
+
+DOCKER_ARCH=arm32v7
+DOCKER_ORG=agners
+DOCKER_IMAGE=archlinuxarm-${DOCKER_ARCH}
+
+TAG_DATE=$(date +'%Y%m%d')
+
+docker push $DOCKER_ORG/$DOCKER_IMAGE $DOCKER_ORG/$DOCKER_IMAGE:$TAG_DATE
+
+

rootfs/etc/locale.conf

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+LANG=en_US.UTF-8

rootfs/etc/locale.gen

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+en_US.UTF-8 UTF-8

rootfs/etc/pacman.d/mirrorlist

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+Server = http://mirror.archlinuxarm.org/$arch/$repo

rootfs/usr/share/libalpm/hooks/man-page-remove.hook

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+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Package
+Target = *
+
+[Action]
+Description = Cleaning up package cache...
+Depends = coreutils
+When = PostTransaction
+Exec = /usr/bin/rm -rf /usr/share/man/

rootfs/usr/share/libalpm/hooks/package-cleanup.hook

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+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Package
+Target = *
+
+[Action]
+Description = Cleaning up package cache...
+Depends = coreutils
+When = PostTransaction
+Exec = /usr/bin/rm -rf /var/cache/pacman/pkg