env/js-wasm, dashboard: add start of a js-wasm builder

Updates golang/go#18892

Change-Id: I4b16afe8f0ce74f6ecd022f8bca14ada94ab308f
Reviewed-on: https://go-review.googlesource.com/112736
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

dashboard/builders.go

@@ -62,6 +62,12 @@ var Hosts = map[string]*HostConfig{
 		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
 		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
 	},
+	"host-js-wasm": &HostConfig{
+		Notes:           "Container with node.js for testing js/wasm.",
+		ContainerImage:  "js-wasm:latest",
+		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
+		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
+	},
 	"host-s390x-cross-kube": &HostConfig{
 		Notes:           "Container with s390x cross-compiler.",
 		ContainerImage:  "linux-s390x-stretch:latest",
@@ -1120,6 +1126,17 @@ func init() {
 		numTryTestHelpers: 3,
 		env:               []string{"GOOS=nacl", "GOARCH=amd64p32", "GOHOSTOS=linux", "GOHOSTARCH=amd64"},
 	})
+	addBuilder(BuildConfig{
+		Name:              "js-wasm",
+		HostType:          "host-js-wasm",
+		TryBot:            false,
+		MaxAtOnce:         2,
+		numTryTestHelpers: 0,
+		env: []string{
+			"GOOS=js", "GOARCH=wasm", "GOHOSTOS=linux", "GOHOSTARCH=amd64",
+			"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/workdir/go/misc/wasm",
+		},
+	})
 	addBuilder(BuildConfig{
 		Name:              "openbsd-amd64-60",
 		HostType:          "host-openbsd-amd64-60",

env/js-wasm/Dockerfile

@@ -0,0 +1,16 @@
+# Copyright 2018 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.
+
+FROM {{REPO}}/linux-x86-sid:latest
+MAINTAINER golang-dev <golang-dev@googlegroups.com>
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Add node.js to run the js/wasm tests.
+RUN apt-get update && apt-get install -y \
+	--no-install-recommends \
+	nodejs \
+	&& rm -rf /var/lib/apt/lists/*
+
+CMD ["/usr/local/bin/stage0"]

env/js-wasm/Makefile

@@ -0,0 +1,31 @@
+# Copyright 2018 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 $(CURDIR))
+STAGING_REPO=gcr.io/go-dashboard-dev
+PROD_REPO=gcr.io/symbolic-datum-552
+
+usage:
+	echo "Use staging, prod, or dev targets. For dev, specify your Docker repository with the REPO=foo argument." ; exit 1
+
+staging: Dockerfile
+	sed 's|{{REPO}}|'"$(STAGING_REPO)"'|g' Dockerfile > Dockerfile.make
+	docker build -t $(STAGING_REPO)/$(IMAGE_NAME):latest -f Dockerfile.make .
+	docker push $(STAGING_REPO)/$(IMAGE_NAME):latest
+	rm Dockerfile.make
+
+prod: Dockerfile
+	sed 's|{{REPO}}|'"$(PROD_REPO)"'|g' Dockerfile > Dockerfile.make
+	docker build -t $(PROD_REPO)/$(IMAGE_NAME):latest -f Dockerfile.make .
+	docker push $(PROD_REPO)/$(IMAGE_NAME):latest
+	rm Dockerfile.make
+
+# You must provide a REPO=your-repo-name arg when you make
+# this target. REPO is the name of the Docker repository
+# that will be prefixed to the name of the image being built.
+dev: Dockerfile
+	sed 's|{{REPO}}|'"$(REPO)"'|g' Dockerfile > Dockerfile.make
+	docker build -t $(REPO)/$(IMAGE_NAME):latest -f Dockerfile.make .
+	docker push $(REPO)/$(IMAGE_NAME):latest
+	rm Dockerfile.make