Add version command and version info to bucketbench

Signed-off-by: Phil Estes <[email protected]>

cmd/version.go

@@ -0,0 +1,40 @@
+// Copyright © 2018 Phil Estes <[email protected]>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// filled in at compile time
+var gitCommit = ""
+
+const version = "0.4.0"
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Display bucketbench version and git commit information.",
+	Long: `Display the bucketbench version and git commit information embedded in
+the binary at build time.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("bucketbench v%s (commit: %s)\n", version, gitCommit)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(versionCmd)
+}