Fix for Support selection of datastore for dynamic provisioning in vSphere

vendor/github.com/vmware/govmomi/object/diagnostic_log.go

@@ -0,0 +1,76 @@
+/*
+Copyright (c) 2015 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 object
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math"
+)
+
+// DiagnosticLog wraps DiagnosticManager.BrowseLog
+type DiagnosticLog struct {
+	m DiagnosticManager
+
+	Key  string
+	Host *HostSystem
+
+	Start int32
+}
+
+// Seek to log position starting at the last nlines of the log
+func (l *DiagnosticLog) Seek(ctx context.Context, nlines int32) error {
+	h, err := l.m.BrowseLog(ctx, l.Host, l.Key, math.MaxInt32, 0)
+	if err != nil {
+		return err
+	}
+
+	l.Start = h.LineEnd - nlines
+
+	return nil
+}
+
+// Copy log starting from l.Start to the given io.Writer
+// Returns on error or when end of log is reached.
+func (l *DiagnosticLog) Copy(ctx context.Context, w io.Writer) (int, error) {
+	const max = 500 // VC max == 500, ESX max == 1000
+	written := 0
+
+	for {
+		h, err := l.m.BrowseLog(ctx, l.Host, l.Key, l.Start, max)
+		if err != nil {
+			return 0, err
+		}
+
+		for _, line := range h.LineText {
+			n, err := fmt.Fprintln(w, line)
+			written += n
+			if err != nil {
+				return written, err
+			}
+		}
+
+		l.Start += int32(len(h.LineText))
+
+		if l.Start >= h.LineEnd {
+			break
+		}
+	}
+
+	return written, nil
+}