version: added more version information

added more version information output to aid debugging
print etcd Version, Git SHA, Go runtime version, OS
and architecture

Fixes #2560

build

@@ -11,6 +11,8 @@ ln -s ${PWD} $GOPATH/src/${REPO_PATH}
 
 eval $(go env)
 
+GIT_SHA=`git rev-parse --short HEAD`
+
 # Static compilation is useful when etcd is run in a container
-CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags '-s' -o bin/etcd ${REPO_PATH}
-CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags '-s' -o bin/etcdctl ${REPO_PATH}/etcdctl
+CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s -X ${REPO_PATH}/version.GitSHA ${GIT_SHA}" -o bin/etcd ${REPO_PATH}
+CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "-s" -o bin/etcdctl ${REPO_PATH}/etcdctl

etcdmain/config.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"net/url"
 	"os"
+	"runtime"
 	"strings"
 
 	"github.com/coreos/etcd/etcdserver"
@@ -223,7 +224,10 @@ func (cfg *config) Parse(arguments []string) error {
 	}
 
 	if cfg.printVersion {
-		fmt.Println("etcd version", version.Version)
+		fmt.Printf("etcd Version: %s\n", version.Version)
+		fmt.Printf("Git SHA: %s\n", version.GitSHA)
+		fmt.Printf("Go Version: %s\n", runtime.Version())
+		fmt.Printf("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
 		os.Exit(0)
 	}
 

version/version.go

@@ -28,6 +28,9 @@ var (
 	// MinClusterVersion is the min cluster version this etcd binary is compatible with.
 	MinClusterVersion = "2.0.0"
 	Version           = "2.1.0-alpha.0+git"
+
+	// Git SHA Value will be set during build
+	GitSHA = "Not provided (use ./build instead of go build)"
 )
 
 // WalVersion is an enum for versions of etcd logs.