Show fission deployment version with cli (#538)

Add version information to binary through go ldflags

builder/builder.go

@@ -33,6 +33,8 @@ import (
 	"time"
 
 	"github.com/dchest/uniuri"
+
+	"github.com/fission/fission"
 )
 
 const (
@@ -68,6 +70,11 @@ func MakeBuilder(sharedVolumePath string) *Builder {
 	}
 }
 
+func (builder *Builder) VersionHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	fmt.Fprintf(w, fission.VersionInfo().String())
+}
+
 func (builder *Builder) Handler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "POST" {
 		e := fmt.Sprintf("Method not allowed: %v", r.Method)

builder/cmd/build.sh

@@ -1,3 +1,18 @@
 #!/bin/bash
-CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -gcflags=-trimpath=$GOPATH -asmflags=-trimpath=$GOPATH -o builder .
+version=$1
+if [ -z $version ]; then
+    version=$(git rev-parse HEAD)
+fi
+
+date=$2
+if [ -z $date ]; then
+    date=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+fi
+
+gitcommit=$3
+if [ -z $gitcommit ]; then
+    gitcommit=$(git rev-parse HEAD)
+fi
+
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -gcflags=-trimpath=$GOPATH -asmflags=-trimpath=$GOPATH -ldflags "-X github.com/fission/fission.GitCommit=$gitcommit -X github.com/fission/fission.BuildDate=$date -X github.com/fission/fission.Version=$version" -o builder .
 

builder/cmd/main.go

@@ -38,6 +38,7 @@ func main() {
 	builder := builder.MakeBuilder(dir)
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", builder.Handler)
+	mux.HandleFunc("/version", builder.VersionHandler)
 	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
 	})