hack: add Dockerfile and shell target

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

Dockerfile

@@ -1 +1,50 @@
-FROM alpine
+# syntax=docker/dockerfile:1.0-experimental
+
+ARG DOCKERD_VERSION=18.09
+ARG CLI_VERSION=19.03
+
+FROM docker:$DOCKERD_VERSION AS dockerd-release
+
+# xgo is a helper for golang cross-compilation
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:golang@sha256:6f7d999551dd471b58f70716754290495690efa8421e0a1fcf18eb11d0c0a537 AS xgo
+
+FROM --platform=$BUILDPLATFORM golang:1.12-alpine AS gobase
+COPY --from=xgo / /
+RUN apk add --no-cache file
+ENV GOFLAGS=-mod=vendor
+WORKDIR /src
+
+FROM gobase AS buildx-version
+RUN --mount=target=. \
+  PKG=github.com/tonistiigi/buildx VERSION=$(git describe --match 'v[0-9]*' --dirty='.m' --always --tags) REVISION=$(git rev-parse HEAD)$(if ! git diff --no-ext-diff --quiet --exit-code; then echo .m; fi); \
+  echo "-X ${PKG}/version.Version=${VERSION} -X ${PKG}/version.Revision=${REVISION} -X ${PKG}/version.Package=${PKG}" | tee /tmp/.ldflags; \
+  echo -n "${VERSION}" | tee /tmp/.version;
+
+FROM gobase AS buildx-build
+ENV CGO_ENABLED=0
+ARG TARGETPLATFORM
+RUN --mount=target=. --mount=target=/root/.cache,type=cache \
+  --mount=target=/go/pkg/mod,type=cache \
+  --mount=source=/tmp/.ldflags,target=/tmp/.ldflags,from=buildx-version \
+  set -x; go build -ldflags "$(cat /tmp/.ldflags)" -o /usr/bin/buildx ./cmd/buildx && \
+  file /usr/bin/buildx && file /usr/bin/buildx | egrep "statically linked|Mach-O|Windows"
+
+FROM golang:1.12-alpine AS docker-cli-build
+RUN apk add -U git bash coreutils gcc musl-dev
+ENV CGO_ENABLED=0
+ARG REPO=github.com/docker/cli
+ARG CLI_VERSION
+WORKDIR /go/src/github.com/docker/cli
+RUN git clone git://$REPO . && git checkout $BRANCH
+RUN ./scripts/build/binary
+
+FROM alpine AS demo-env
+RUN apk add --no-cache iptables tmux
+RUN mkdir -p /usr/local/lib/docker/cli-plugins && ln -s /usr/local/bin/buildx /usr/local/lib/docker/cli-plugins/docker-buildx
+COPY ./hack/demo-env/entrypoint.sh /usr/local/bin
+COPY ./hack/demo-env/tmux.conf /root/.tmux.conf
+COPY --from=dockerd-release /usr/local/bin /usr/local/bin
+COPY --from=docker-cli-build /go/src/github.com/docker/cli/build/docker /usr/local/bin
+COPY --from=buildx-build /usr/bin/buildx /usr/local/bin/
+VOLUME /var/lib/docker
+ENTRYPOINT ["entrypoint.sh"]

Makefile

@@ -0,0 +1,10 @@
+shell:
+	./hack/shell
+
+lint:
+	./hack/lint
+	
+vendor:
+	./hack/update-vendor
+
+.PHONY: vendor lint shell

hack/demo-env/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+tmux new -s demo -d
+tmux new-window 'dockerd -s overlay2 -D'
+tmux new-window
+tmux a -t demo
+
+

hack/demo-env/tmux.conf

@@ -0,0 +1 @@
+set -g mouse on

hack/shell

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+
+function clean {
+  docker rmi $(cat $iidfile)
+}
+
+iidfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
+docker build --iidfile $iidfile --target demo-env .
+trap clean EXIT
+docker run -it --privileged --rm $(cat $iidfile)