Build/release script and fix version annotation.

Makefile

@@ -3,11 +3,13 @@ KEY = host_key
 PORT = 2022
 
 SRCS = %.go
+VERSION := $(shell git describe --long --tags --dirty --always)
+LDFLAGS = LDFLAGS="-X main.Version=$(VERSION)"
 
 all: $(BINARY)
 
 $(BINARY): deps **/**/*.go **/*.go *.go
-	go build -ldflags "-X main.buildCommit=`git describe --long --tags --dirty --always`" ./cmd/ssh-chat
+	go build $(BUILDFLAGS) ./cmd/ssh-chat
 
 deps:
 	go get ./...
@@ -29,3 +31,8 @@ debug: $(BINARY) $(KEY)
 test:
 	go test ./...
 	golint ./...
+
+release:
+	ENV=GOOS=linux GOARCH=amd64 $(LDFLAGS) ./build_release "github.com/shazow/ssh-chat/cmd/ssh-chat" README.md LICENSE
+	ENV=GOOS=linux GOARCH=386 $(LDFLAGS) ./build_release "github.com/shazow/ssh-chat/cmd/ssh-chat" README.md LICENSE
+	ENV=GOOS=darwin GOARCH=amd64 $(LDFLAGS) ./build_release "github.com/shazow/ssh-chat/cmd/ssh-chat" README.md LICENSE

build_release

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+usage() {
+    echo "Build and bundle Go releases with the current dir as the build dir."
+    echo "Usage: $0 PACKAGE [ASSETS...]"
+}
+
+main() {
+    set -eo pipefail
+    [[ "$TRACE" ]] && set -x
+
+    if [[ ! "$1" ]]; then
+        usage
+        exit 1
+    fi
+
+    if [[ ! "$GOOS" ]]; then
+        export GOOS="linux"
+    fi
+    if [[ ! "$GOARCH" ]]; then
+        export GOARCH="amd64"
+    fi
+    if [[ ! "$BUILDDIR" ]]; then
+        export BUILDDIR="build"
+    fi
+
+    build "$@"
+}
+
+build() {
+    local package="$1"; shift
+    local assets="$@"
+
+    local bin="$(basename $package)"
+    local tarball="${bin}-${GOOS}_${GOARCH}.tgz"
+    local outdir="$BUILDDIR/$bin"
+
+    if [[ -d "$outdir" ]]; then
+        echo "err: outdir already exists: $PWD/$outdir"
+    fi
+    mkdir -p "$outdir"
+
+    go build -ldflags "$LDFLAGS" -o "$outdir/$bin" "$package"
+
+    # Stage asset bundle
+    if [[ "$assets" ]]; then
+        ln -f $assets "$outdir"
+    fi
+
+    # Create tarball
+    tar -C "$BUILDDIR" -czvf "$BUILDDIR/$tarball" "$bin"
+
+    # Cleanup
+    rm -rf "$outdir"
+
+    echo "Packaged: $tarball"
+}
+
+main "$@"

cmd/ssh-chat/cmd.go

@@ -22,9 +22,13 @@ import (
 )
 import _ "net/http/pprof"
 
+// Version of the binary, assigned during build.
+var Version string = "dev"
+
 // Options contains the flag options
 type Options struct {
 	Verbose   []bool `short:"v" long:"verbose" description:"Show verbose logging."`
+	Version   bool   `long:"version" description:"Print version and exit."`
 	Identity  string `short:"i" long:"identity" description:"Private key to identify server with." default:"~/.ssh/id_rsa"`
 	Bind      string `long:"bind" description:"Host and port to listen on." default:"0.0.0.0:2022"`
 	Admin     string `long:"admin" description:"File of public keys who are admins."`
@@ -63,6 +67,11 @@ func main() {
 		}()
 	}
 
+	if options.Version {
+		fmt.Println(Version)
+		os.Exit(0)
+	}
+
 	// Figure out the log level
 	numVerbose := len(options.Verbose)
 	if numVerbose > len(logLevels) {
@@ -111,6 +120,7 @@ func main() {
 
 	host := sshchat.NewHost(s, auth)
 	host.SetTheme(message.Themes[0])
+	host.Version = Version
 
 	err = fromFile(options.Admin, func(line []byte) error {
 		key, _, _, _, err := ssh.ParseAuthorizedKey(line)

host.go

@@ -13,8 +13,6 @@ import (
 	"github.com/shazow/ssh-chat/sshd"
 )
 
-var buildCommit string
-
 const maxInputLength int = 1024
 
 // GetPrompt will render the terminal prompt string based on the user.
@@ -37,6 +35,9 @@ type Host struct {
 	auth  *Auth
 	count int
 
+	// Version string to print on /version
+	Version string
+
 	// Default theme
 	theme message.Theme
 }
@@ -324,7 +325,7 @@ func (h *Host) InitCommands(c *chat.Commands) {
 	c.Add(chat.Command{
 		Prefix: "/version",
 		Handler: func(room *chat.Room, msg message.CommandMsg) error {
-			room.Send(message.NewSystemMsg(buildCommit, msg.From()))
+			room.Send(message.NewSystemMsg(h.Version, msg.From()))
 			return nil
 		},
 	})