add vendoring with go dep

vendor/github.com/vmware/govmomi/govc/flags/debug.go

@@ -0,0 +1,99 @@
+/*
+Copyright (c) 2014-2016 VMware, Inc. All Rights Reserved.
+
+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 flags
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/vmware/govmomi/vim25/debug"
+)
+
+type DebugFlag struct {
+	common
+
+	enable bool
+}
+
+var debugFlagKey = flagKey("debug")
+
+func NewDebugFlag(ctx context.Context) (*DebugFlag, context.Context) {
+	if v := ctx.Value(debugFlagKey); v != nil {
+		return v.(*DebugFlag), ctx
+	}
+
+	v := &DebugFlag{}
+	ctx = context.WithValue(ctx, debugFlagKey, v)
+	return v, ctx
+}
+
+func (flag *DebugFlag) Register(ctx context.Context, f *flag.FlagSet) {
+	flag.RegisterOnce(func() {
+		env := "GOVC_DEBUG"
+		enable := false
+		switch env := strings.ToLower(os.Getenv(env)); env {
+		case "1", "true":
+			enable = true
+		}
+
+		usage := fmt.Sprintf("Store debug logs [%s]", env)
+		f.BoolVar(&flag.enable, "debug", enable, usage)
+	})
+}
+
+func (flag *DebugFlag) Process(ctx context.Context) error {
+	if !flag.enable {
+		return nil
+	}
+
+	return flag.ProcessOnce(func() error {
+		// Base path for storing debug logs.
+		r := os.Getenv("GOVC_DEBUG_PATH")
+		if r == "" {
+			r = home
+		}
+		r = filepath.Join(r, "debug")
+
+		// Path for this particular run.
+		run := os.Getenv("GOVC_DEBUG_PATH_RUN")
+		if run == "" {
+			now := time.Now().Format("2006-01-02T15-04-05.999999999")
+			r = filepath.Join(r, now)
+		} else {
+			// reuse the same path
+			r = filepath.Join(r, run)
+			_ = os.RemoveAll(r)
+		}
+
+		err := os.MkdirAll(r, 0700)
+		if err != nil {
+			return err
+		}
+
+		p := debug.FileProvider{
+			Path: r,
+		}
+
+		debug.SetProvider(&p)
+		return nil
+	})
+}