Add support for Docker image build

.dockerignore

@@ -0,0 +1,2 @@
+.git
+vendor

.gitignore

@@ -4,9 +4,8 @@
 
 # build artifacts
 coverage
-opa
-opa_linux_amd64
-opa_darwin_amd64
+opa_*
+.Dockerfile_*
 
 # runtime artifacts
 policies

.travis.yml

@@ -1,6 +1,4 @@
 language: go
-env:
-  - CROSSCOMPILE="linux/amd64 darwin/amd64"
 go:
   - 1.6
   - 1.7

Dockerfile.in

@@ -0,0 +1,13 @@
+# Copyright 2016 The OPA Authors.  All rights reserved.
+# Use of this source code is governed by an Apache2
+# license that can be found in the LICENSE file.
+
+FROM scratch
+
+MAINTAINER Torin Sandall <[email protected]>
+
+ADD /opa_linux_GOARCH /opa
+
+ENTRYPOINT ["/opa"]
+
+CMD ["run"]

Makefile

@@ -2,7 +2,7 @@
 # Use of this source code is governed by an Apache2
 # license that can be found in the LICENSE file.
 
-VERSION := "0.1.1-dev"
+VERSION := 0.1.1-dev
 
 PACKAGES := \
 	github.com/open-policy-agent/opa/ast/.../ \
@@ -16,6 +16,13 @@ PACKAGES := \
 	github.com/open-policy-agent/opa/test/.../
 
 GO := go
+GOARCH := $(shell go env GOARCH)
+GOOS := $(shell go env GOOS)
+
+BIN := opa_$(GOOS)_$(GOARCH)
+
+REPOSITORY := openpolicyagent
+IMAGE := $(REPOSITORY)/opa
 
 BUILD_COMMIT := $(shell ./build/get-build-commit.sh)
 BUILD_TIMESTAMP := $(shell ./build/get-build-timestamp.sh)
@@ -26,10 +33,6 @@ LDFLAGS := "-X github.com/open-policy-agent/opa/version.Version=$(VERSION) \
 	-X github.com/open-policy-agent/opa/version.Timestamp=$(BUILD_TIMESTAMP) \
 	-X github.com/open-policy-agent/opa/version.Hostname=$(BUILD_HOSTNAME)"
 
-# Set CROSSCOMPILE to space separated list of <platform>/<arch> pairs to
-# have the build produce binaries for each platform/arch.
-CROSSCOMPILE ?=
-
 GO15VENDOREXPERIMENT := 1
 export GO15VENDOREXPERIMENT
 
@@ -46,11 +49,15 @@ generate:
 	$(GO) generate
 
 build: generate
-ifeq ($(CROSSCOMPILE),)
-	$(GO) build -o opa -ldflags $(LDFLAGS)
-else
-	@./build/cross-compile.sh --prefix opa --ldflags $(LDFLAGS) --platforms "$(CROSSCOMPILE)"
-endif
+	$(GO) build -o $(BIN) -ldflags $(LDFLAGS)
+
+image:
+	@$(MAKE) build GOOS=linux
+	sed -e 's/GOARCH/$(GOARCH)/g' Dockerfile.in > .Dockerfile_$(GOARCH)
+	docker build -t $(IMAGE):$(VERSION)	-f .Dockerfile_$(GOARCH) .
+
+push:
+	docker push $(IMAGE):$(VERSION)
 
 install: generate
 	$(GO) install -ldflags $(LDFLAGS)
@@ -87,6 +94,5 @@ fmt:
 	$(GO) fmt $(PACKAGES)
 
 clean:
-	rm -f ./opa
-	rm -f ./opa_linux_amd64
-	rm -f ./opa_darwin_amd64
+	rm -f opa_*_*
+	rm -f .Dockerfile_*

docs/RELEASE.md

@@ -65,18 +65,31 @@ CHANGELOG.md snippet and uploading the packages from the build phase.
 	git checkout v<semver>
 	```
 
-1. Run command to build packages. This will produce a bunch of binaries (e.g., amd64/linux, i386/linux, amd64/darwin, etc.) that can be published (“distributions”).
+1. Build binaries for target platforms.
 
 	```
-	make build CROSSCOMPILE="linux/amd64 darwin/amd64"
+	make build GOOS=linux GOARCH=amd64
+	make build GOOS=darwin GOARCH=amd64
 	```
 
+1. Build Docker image.
+
+    ```
+    make image
+    ```
+
 ## Publishing
 
 1. Open browser and go to https://github.com/open-policy-agent/opa/releases
 
 1. Create a new release for the version.
 	- Copy the changelog content into the message.
-	- Upload the distributions packages.
+	- Upload the binaries.
+
+1. Push the Docker image.
+
+    ```
+    make push
+    ```
 
-1. In addition to publishing the packages, there may be documentation updates that should be released. See [site/README.md](../site/README.md) for steps to update the website.
+1. There may be documentation updates that should be released. See [site/README.md](../site/README.md) for steps to update the website.