hack: add test target

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

.gitignore

@@ -1 +1,2 @@
-bin
+bin
+cross-out

Dockerfile

@@ -29,6 +29,9 @@ RUN --mount=target=. --mount=target=/root/.cache,type=cache \
   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 buildx-build AS integration-tests
+COPY . .
+
 FROM golang:1.12-alpine AS docker-cli-build
 RUN apk add -U git bash coreutils gcc musl-dev
 ENV CGO_ENABLED=0

Makefile

@@ -14,10 +14,13 @@ install: binaries
 lint:
 	./hack/lint
 
+test:
+	./hack/test
+
 validate-vendor:
 	./hack/validate-vendor
 	
-validate-all: lint validate-vendor
+validate-all: lint test validate-vendor
 
 vendor:
 	./hack/update-vendor

hack/test

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+
+. $(dirname $0)/util
+set -eu -o pipefail
+
+: ${CONTINUOUS_INTEGRATION=}
+: ${BUILDX_NOCACHE=}
+
+progressFlag=""
+if [ "$CONTINUOUS_INTEGRATION" == "true" ]; then progressFlag="--progress=plain"; fi
+
+iid="buildx-tests"
+iidfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
+set -x
+
+case $buildmode in
+"buildkit")
+  tmpfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
+  buildctl build $progressFlag --frontend=dockerfile.v0 \
+    --local context=. --local dockerfile=. \
+    --frontend-opt target=integration-tests \
+    --output type=docker,name=$iid,dest=$tmpfile
+  docker load -i $tmpfile
+  rm $tmpfile
+  ;;
+"docker-buildkit")
+  export DOCKER_BUILDKIT=1
+  docker build --iidfile $iidfile --target integration-tests --force-rm .
+  iid=$(cat $iidfile)
+  ;;
+*)
+  echo "docker with buildkit support is required"
+  exit 1
+  ;;
+esac
+
+cacheVolume="buildx-cache"
+if ! docker inspect "$cacheVolume" 2>&1 >/dev/null ; then
+cacheVolume=$(docker create --name=buildx-cache -v /root/.cache -v /go/pkg/mod alpine)
+fi
+
+docker run --rm -v /tmp --volumes-from=$cacheVolume --privileged $iid go test ${TESTFLAGS:--v} ${TESTPKGS:-./...}
+
+if [ -n "$BUILDX_NOCACHE" ]; then
+  docker rm -v $cacheVolume
+fi
+
+case $buildmode in
+"docker-buildkit")
+  rm "$iidfile"
+  docker rmi $iid
+  ;;
+esac