added clout init image docs

helper.go

@@ -3,6 +3,7 @@
 package pve
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"io"
@@ -43,3 +44,25 @@ func (b httpbody) Reader() io.Reader {
 	}
 	return strings.NewReader(data.Encode())
 }
+
+type unreadBuffer struct {
+	b    *bytes.Buffer
+	save []byte
+}
+
+func newUnreadBuffer() (ub *unreadBuffer, buf *bytes.Buffer) {
+	buf = new(bytes.Buffer)
+	ub = &unreadBuffer{b: buf}
+	return
+}
+
+func (u *unreadBuffer) Save() {
+	u.save = u.b.Bytes()
+}
+
+func (u *unreadBuffer) Reset(b **bytes.Buffer) {
+	if u.save != nil && b != nil {
+		u.b = bytes.NewBuffer(u.save)
+		*b = u.b
+	}
+}