Adding basic CLI infrastructure

.gitignore

@@ -21,3 +21,4 @@ _testmain.go
 
 *.exe
 *.test
+bin/

command/version.go

@@ -0,0 +1,38 @@
+package command
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/mitchellh/cli"
+)
+
+// VersionCommand is a Command implementation prints the version.
+type VersionCommand struct {
+	Revision          string
+	Version           string
+	VersionPrerelease string
+	Ui                cli.Ui
+}
+
+func (c *VersionCommand) Help() string {
+	return ""
+}
+
+func (c *VersionCommand) Run(_ []string) int {
+	var versionString bytes.Buffer
+	fmt.Fprintf(&versionString, "Consul v%s", c.Version)
+	if c.VersionPrerelease != "" {
+		fmt.Fprintf(&versionString, ".%s", c.VersionPrerelease)
+
+		if c.Revision != "" {
+			fmt.Fprintf(&versionString, " (%s)", c.Revision)
+		}
+	}
+
+	c.Ui.Output(versionString.String())
+	return 0
+}
+
+func (c *VersionCommand) Synopsis() string {
+	return "Prints the Consul version"
+}

command/version_test.go

@@ -0,0 +1,10 @@
+package command
+
+import (
+	"github.com/mitchellh/cli"
+	"testing"
+)
+
+func TestVersionCommand_implements(t *testing.T) {
+	var _ cli.Command = &VersionCommand{}
+}

commands.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"github.com/hashicorp/consul/command"
+	"github.com/mitchellh/cli"
+	"os"
+	"os/signal"
+)
+
+// Commands is the mapping of all the available Serf commands.
+var Commands map[string]cli.CommandFactory
+
+func init() {
+	ui := &cli.BasicUi{Writer: os.Stdout}
+
+	Commands = map[string]cli.CommandFactory{
+		"version": func() (cli.Command, error) {
+			return &command.VersionCommand{
+				Revision:          GitCommit,
+				Version:           Version,
+				VersionPrerelease: VersionPrerelease,
+				Ui:                ui,
+			}, nil
+		},
+	}
+}
+
+// makeShutdownCh returns a channel that can be used for shutdown
+// notifications for commands. This channel will send a message for every
+// interrupt received.
+func makeShutdownCh() <-chan struct{} {
+	resultCh := make(chan struct{})
+
+	signalCh := make(chan os.Signal, 4)
+	signal.Notify(signalCh, os.Interrupt)
+	go func() {
+		for {
+			<-signalCh
+			resultCh <- struct{}{}
+		}
+	}()
+
+	return resultCh
+}

main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"github.com/mitchellh/cli"
+	"io/ioutil"
+	"log"
+	"os"
+)
+
+func main() {
+	os.Exit(realMain())
+}
+
+func realMain() int {
+	log.SetOutput(ioutil.Discard)
+
+	// Get the command line args. We shortcut "--version" and "-v" to
+	// just show the version.
+	args := os.Args[1:]
+	for _, arg := range args {
+		if arg == "-v" || arg == "--version" {
+			newArgs := make([]string, len(args)+1)
+			newArgs[0] = "version"
+			copy(newArgs[1:], args)
+			args = newArgs
+			break
+		}
+	}
+
+	cli := &cli.CLI{
+		Args:     args,
+		Commands: Commands,
+	}
+
+	exitCode, err := cli.Run()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error executing CLI: %s\n", err.Error())
+		return 1
+	}
+
+	return exitCode
+}

main_test.go

@@ -0,0 +1 @@
+package main

scripts/build.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+#
+# This script builds the application from source.
+set -e
+
+# Get the parent directory of where this script is.
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
+DIR="$( cd -P "$( dirname "$SOURCE" )/.." && pwd )"
+
+# Change into that directory
+cd $DIR
+
+# Get the git commit
+GIT_COMMIT=$(git rev-parse HEAD)
+GIT_DIRTY=$(test -n "`git status --porcelain`" && echo "+CHANGES" || true)
+
+# If we're building on Windows, specify an extension
+EXTENSION=""
+if [ "$(go env GOOS)" = "windows" ]; then
+    EXTENSION=".exe"
+fi
+
+# Install dependencies
+echo "--> Installing dependencies to speed up builds..."
+go get ./...
+
+# Build!
+echo "--> Building..."
+go build \
+    -ldflags "-X main.GitCommit ${GIT_COMMIT}${GIT_DIRTY}" \
+    -v \
+    -o bin/consul${EXTENSION}
+cp bin/consul${EXTENSION} $GOPATH/bin

scripts/dist.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+set -e
+
+# Get the parent directory of where this script is.
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
+DIR="$( cd -P "$( dirname "$SOURCE" )/.." && pwd )"
+
+# Change into that dir because we expect that
+cd $DIR
+
+# Determine the version that we're building based on the contents
+# of packer/version.go.
+VERSION=$(grep "const Version " version.go | sed -E 's/.*"(.+)"$/\1/')
+VERSIONDIR="${VERSION}"
+PREVERSION=$(grep "const VersionPrerelease " version.go | sed -E 's/.*"(.*)"$/\1/')
+if [ ! -z $PREVERSION ]; then
+    PREVERSION="${PREVERSION}.$(date -u +%s)"
+    VERSIONDIR="${VERSIONDIR}-${PREVERSION}"
+fi
+
+echo "Version: ${VERSION} ${PREVERSION}"
+
+# Determine the arch/os combos we're building for
+XC_ARCH=${XC_ARCH:-"386 amd64 arm"}
+XC_OS=${XC_OS:-linux darwin windows freebsd openbsd}
+
+echo "Arch: ${XC_ARCH}"
+echo "OS: ${XC_OS}"
+
+# Make sure that if we're killed, we kill all our subprocseses
+trap "kill 0" SIGINT SIGTERM EXIT
+
+# This function builds whatever directory we're in...
+goxc \
+    -arch="$XC_ARCH" \
+    -os="$XC_OS" \
+    -d="${DIR}/pkg" \
+    -pv="${VERSION}" \
+    -pr="${PREVERSION}" \
+    $XC_OPTS \
+    go-install \
+    xc
+
+# Zip all the packages
+mkdir -p ./pkg/${VERSIONDIR}/dist
+for PLATFORM in $(find ./pkg/${VERSIONDIR} -mindepth 1 -maxdepth 1 -type d); do
+    PLATFORM_NAME=$(basename ${PLATFORM})
+    ARCHIVE_NAME="${VERSIONDIR}_${PLATFORM_NAME}"
+
+    if [ $PLATFORM_NAME = "dist" ]; then
+        continue
+    fi
+
+    pushd ${PLATFORM}
+    zip ${DIR}/pkg/${VERSIONDIR}/dist/${ARCHIVE_NAME}.zip ./*
+    popd
+done
+
+# Make the checksums
+pushd ./pkg/${VERSIONDIR}/dist
+shasum -a256 * > ./${VERSIONDIR}_SHA256SUMS
+popd
+
+exit 0

version.go

@@ -0,0 +1,12 @@
+package main
+
+// The git commit that was compiled. This will be filled in by the compiler.
+var GitCommit string
+
+// The main version number that is being run at the moment.
+const Version = "0.1.0"
+
+// A pre-release marker for the version. If this is "" (empty string)
+// then it means that it is a final release. Otherwise, this is a pre-release
+// such as "dev" (in development), "beta", "rc1", etc.
+const VersionPrerelease = "dev"