env: add alpine linux builder

Adds flag to upload to build binary statically.

Updates golang/go#17891

Change-Id: If19b2e2cf9a84fa2b4cc6fdf55d8add5b54abff7
Reviewed-on: https://go-review.googlesource.com/33890
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

cmd/buildlet/Makefile

@@ -20,6 +20,10 @@ buildlet.linux-amd64: FORCE
 	go install golang.org/x/build/cmd/upload
 	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet --public --cacheable=false go-builder-data/$@
 
+buildlet.linux-amd64-static: FORCE
+	go install golang.org/x/build/cmd/upload
+	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet --public --cacheable=false --static go-builder-data/$@
+
 buildlet.netbsd-amd64: FORCE
 	go install golang.org/x/build/cmd/upload
 	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet --public --cacheable=false go-builder-data/$@

cmd/buildlet/stage0/Makefile

@@ -36,6 +36,10 @@ buildlet-stage0.linux-amd64-kube: FORCE
 	go install golang.org/x/build/cmd/upload
 	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet/stage0 --public --cacheable=false go-builder-data/$@
 
+buildlet-stage0.linux-amd64-static: FORCE
+	go install golang.org/x/build/cmd/upload
+	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet/stage0 --public --cacheable=false --static go-builder-data/$@
+
 buildlet-stage0.linux-s390x: FORCE
 	go install golang.org/x/build/cmd/upload
 	upload --verbose --osarch=$@ --file=go:golang.org/x/build/cmd/buildlet/stage0 --public --cacheable=false go-builder-data/$@

cmd/upload/upload.go

@@ -41,6 +41,7 @@ var (
 	doGzip        = flag.Bool("gzip", false, "gzip the stored contents (not the upload's Content-Encoding); this forces the Content-Type to be application/octet-stream. To prevent misuse, the object name must also end in '.gz'")
 	extraEnv      = flag.String("extraenv", "", "comma-separated list of addition KEY=val environment pairs to include in build environment when building a target to upload")
 	installSuffix = flag.String("installsuffix", "", "installsuffix for the go command")
+	static        = flag.Bool("static", false, "compile the binary statically, adds necessary ldflags")
 )
 
 func main() {
@@ -203,12 +204,16 @@ func buildGoTarget() {
 	}
 
 	version := os.Getenv("USER") + "-" + time.Now().Format(time.RFC3339)
+	ldflags := "-X main.Version=" + version
+	if *static {
+		ldflags = "-linkmode=external -extldflags '-static -pthread' " + ldflags
+	}
 	cmd = exec.Command("go",
 		"install",
 		"--tags="+*tags,
 		"--installsuffix="+*installSuffix,
 		"-x",
-		"--ldflags=-X main.Version="+version,
+		"--ldflags="+ldflags,
 		target)
 	var stderr bytes.Buffer
 	cmd.Stderr = &stderr

dashboard/builders.go

@@ -53,6 +53,12 @@ var Hosts = map[string]*HostConfig{
 		buildletURLTmpl: "https://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
 		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
 	},
+	"host-linux-x86-alpine": &HostConfig{
+		Notes:           "Kubernetes alpine container on GKE.",
+		KubeImage:       "linux-x86-alpine:latest",
+		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64-static",
+		env:             []string{"GOROOT_BOOTSTRAP=/usr/lib/go"},
+	},
 	"host-linux-clang": &HostConfig{
 		Notes:           "GCE VM with clang.",
 		VMImage:         "linux-buildlet-clang",

env/linux-x86-alpine/Dockerfile

@@ -0,0 +1,31 @@
+# Copyright 2017 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# Alpine Linux builder
+# Docker tag gcr.io/go-dashboard-dev/linux-x86-alpine (staging)
+# and gcr.io/symbolic-datum-552/linux-x86-alpine (prod)
+
+FROM alpine:3.5
+MAINTAINER golang-dev <golang-dev@googlegroups.com>
+
+RUN apk add --no-cache \
+	bash \
+	binutils \
+	build-base \
+	ca-certificates \
+	curl \
+	gcc \
+	gdb \
+	gfortran \
+	git \
+	go \
+	libc-dev \
+	lsof \
+	procps \
+	strace
+
+RUN curl -o /usr/local/bin/stage0 https://storage.googleapis.com/go-builder-data/buildlet-stage0.linux-amd64-static
+RUN chmod +x /usr/local/bin/stage0
+
+ENV GOROOT_BOOTSTRAP=/usr/lib/go

env/linux-x86-alpine/Makefile

@@ -0,0 +1,24 @@
+# Copyright 2017 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+IMAGE_NAME=$(shell basename $(CURDIR))
+STAGING_REPO=gcr.io/go-dashboard-dev
+PROD_REPO=gcr.io/symbolic-datum-552
+
+usage:
+	echo "Use staging, prod, or dev targets. For dev, specify your Docker repository with the REPO=foo argument." ; exit 1
+
+staging: Dockerfile
+	docker build -t $(STAGING_REPO)/$(IMAGE_NAME):latest .
+	gcloud docker push $(STAGING_REPO)/$(IMAGE_NAME):latest
+
+prod: Dockerfile
+	docker build -t $(PROD_REPO)/$(IMAGE_NAME):latest .
+	gcloud docker push $(PROD_REPO)/$(IMAGE_NAME):latest
+
+# You must provide a REPO=your-repo-name arg when you make
+# this targarget. REPO is the name of the Docker repository
+# that will be prefixed to the name of the image being built.
+dev: Dockerfile
+	docker build -t $(REPO)/$(IMAGE_NAME):latest .
+	gcloud docker push $(REPO)/$(IMAGE_NAME):latest