ci,version: add statically linked versioned binary

The release binaries are also uploaded to GitHub releases page.

.drone.sec

@@ -0,0 +1 @@
+eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.SytNdB4wH1wYUiVY5gORAvJCiHovYJ0mlnPCwYv6ClytsRuZkJZsVW5PTkSMH7Xt4idQATISPvagxZaizxYme-bAgJqsoERzvQV3g4l5NrwbI2AR0zZr2ZXWoqEa-LiuRfFNeAAaY8xhtFjmOlL-aNcfR8nDgJQLD9Lhs2VPCdTdrqYGrIYvASo-lVkzhhBSD8DzPx8qIHEUsp_3QtFWLYa-X3C-eWBgefF0fN7nz_SqrHyT82YXX1uCc9qCQx3dlSxYUSNBU6UMiTnF-mwykDC0GoVcQ3RImDHCIrafNAneAC5QgpgDzS9uK0liw28mAaPVdBIISEdvlUYmBfystg.-hI9dcTpYd9mIaly.KlOqcJAceQ4KfhzagQvf9andq6KF_vh1reYM3OgHNEJB5DRexGAVd9LY_X81Wiynv-d5ZSFeGm2PbWne9LtlOW-R8bakf-H-9oL1HqgCMKgDt5qrl08LiFjBBWr7m6HWcEW7ZRLj-pVUuwpltfhxBrHXcNzekaaMTn9cstXBPhPHdEI6ZMZF6T0n992CXZE.zOUAbIwC29tgYOofC8GwRg

.drone.yml

@@ -5,3 +5,11 @@ build:
   commands:
     - go get ./...
     - go test ./...
+    - make -j2
+publish:
+  github_release:
+    when:
+      event: tag
+    api_key: $$GH_API_KEY
+    files: bin/acme-*
+    checksum: sha1

.gitignore

@@ -1 +1,3 @@
+.drone.sec.yml
 *.pem
+bin

Makefile

@@ -0,0 +1,34 @@
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+RELEASES=bin/acme-darwin-amd64 \
+	 bin/acme-linux-amd64 \
+	 bin/acme-linux-386 \
+	 bin/acme-linux-arm \
+	 bin/acme-windows-amd64.exe \
+	 bin/acme-windows-386.exe
+
+all: $(RELEASES)
+
+bin/acme-%: GOOS=$(firstword $(subst -, ,$*))
+bin/acme-%: GOARCH=$(subst .exe,,$(word 2,$(subst -, ,$*)))
+bin/acme-%: $(wildcard *.go)
+	GOOS=$(GOOS) GOARCH=$(GOARCH) CGO_ENABLED=0 go build \
+	     -ldflags "-X main.osarch=$(GOOS)/$(GOARCH) -s -w" \
+	     -buildmode=exe \
+	     -tags release \
+	     -o $@
+
+clean:
+	rm -rf bin

version.go

@@ -0,0 +1,40 @@
+// Copyright 2015 Google Inc. All Rights Reserved.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build release
+
+package main
+
+import "fmt"
+
+var (
+	version = "1.0.0"
+	osarch  string // set by ldflags
+
+	cmdVersion = &command{
+		run:       runVersion,
+		UsageLine: "version",
+		Short:     "display acme tool version",
+		Long: `
+The version command is available only for releases.
+The binary built with "go get" will not have the version subcommand.
+		`,
+	}
+)
+
+func init() {
+	// Insert "acme version" at the top of the commands.
+	commands = append([]*command{cmdVersion}, commands...)
+}
+
+func runVersion(args []string) {
+	fmt.Println(version, osarch)
+}