Dockerfile-dind-rootless.template

FROM docker:{{ env.version }}-dind

# busybox "ip" is insufficient:
#   [rootlesskit:child ] error: executing [[ip tuntap add name tap0 mode tap] [ip link set tap0 address 02:50:00:00:00:01]]: exit status 1
RUN apk add --no-cache iproute2

# "/run/user/UID" will be used by default as the value of XDG_RUNTIME_DIR
RUN mkdir /run/user && chmod 1777 /run/user

# create a default user preconfigured for running rootless dockerd
RUN set -eux; \
	adduser -h /home/rootless -g 'Rootless' -D -u 1000 rootless; \
	echo 'rootless:100000:65536' >> /etc/subuid; \
	echo 'rootless:100000:65536' >> /etc/subgid

RUN set -eux; \
	\
	apkArch="$(apk --print-arch)"; \
	case "$apkArch" in \
{{
	[
		.arches | to_entries[]
		| select(.value.rootlessExtrasUrl)
		| .key as $bashbrewArch
		| (
			{
				amd64: "x86_64",
				arm32v6: "armhf",
				arm32v7: "armv7",
				arm64v8: "aarch64",
			}
			| .[$bashbrewArch] // $bashbrewArch
		) as $apkArch
		| .value
		| (
-}}
		{{ $apkArch | @sh }}) \
			url={{ .rootlessExtrasUrl | @sh }}; \
			;; \
{{
		)
	] | add
-}}
		*) echo >&2 "error: unsupported architecture ($apkArch)"; exit 1 ;; \
	esac; \
	\
	wget -O rootless.tgz "$url"; \
	\
	tar --extract \
		--file rootless.tgz \
		--strip-components 1 \
		--directory /usr/local/bin/ \
		'docker-rootless-extras/rootlesskit' \
		'docker-rootless-extras/rootlesskit-docker-proxy' \
		'docker-rootless-extras/vpnkit' \
	; \
	rm rootless.tgz; \
	\
	rootlesskit --version; \
	vpnkit --version

# pre-create "/var/lib/docker" for our rootless user
RUN set -eux; \
	mkdir -p /home/rootless/.local/share/docker; \
	chown -R rootless:rootless /home/rootless/.local/share/docker
VOLUME /home/rootless/.local/share/docker
USER rootless