build: Add git sha to version output

Makefile

@@ -2,6 +2,13 @@
 UNAME=$(shell uname)
 PREFIX=github.com/derekparker/delve
 GOVERSION=$(shell go version)
+BUILD_SHA=$(shell git rev-parse HEAD)
+
+ifeq "$(UNAME)" "Darwin"
+    BUILD_FLAGS=-ldflags="-s -X main.Build=$(BUILD_SHA)"
+else
+    BUILD_FLAGS=-ldflags="-X main.Build=$(BUILD_SHA)"
+endif
 
 # Workaround for GO15VENDOREXPERIMENT bug (https://github.com/golang/go/issues/11659)
 ALL_PACKAGES=$(shell go list ./... | grep -v /vendor/)
@@ -13,7 +20,6 @@ ALL_PACKAGES=$(shell go list ./... | grep -v /vendor/)
 # unable to execute.
 # See https://github.com/golang/go/issues/11887#issuecomment-126117692.
 ifeq "$(UNAME)" "Darwin"
-	BUILD_FLAGS=-ldflags="-s"
 	TEST_FLAGS=-exec=$(shell pwd)/scripts/testsign
 	DARWIN="true"
 endif

cmd/dlv/main.go

@@ -24,6 +24,8 @@ import (
 
 const version string = "0.10.0-alpha"
 
+var Build string
+
 var (
 	Log        bool
 	Headless   bool
@@ -59,7 +61,7 @@ The goal of this tool is to provide a simple yet powerful interface for debuggin
 		Use:   "version",
 		Short: "Prints version.",
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("Delve version: " + version)
+			fmt.Printf("Delve Debugger\nVersion: %s\nBuild: %s\n", version, Build)
 		},
 	}
 	rootCommand.AddCommand(versionCommand)