vendor: Add dependencies for discosrv

vendor/github.com/cznic/fileutil/storage/file.go

@@ -0,0 +1,50 @@
+// Copyright (c) 2011 CZ.NIC z.s.p.o. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// blame: jnml, labs.nic.cz
+
+package storage
+
+import (
+	"os"
+)
+
+// FileAccessor is the concrete type returned by NewFile and OpenFile.
+type FileAccessor struct {
+	*os.File
+}
+
+// Implementation of Accessor.
+func (f *FileAccessor) BeginUpdate() error { return nil }
+
+// Implementation of Accessor.
+func (f *FileAccessor) EndUpdate() error { return nil }
+
+// NewFile returns an Accessor backed by an os.File named name, It opens the
+// named file with specified flag (os.O_RDWR etc.) and perm, (0666 etc.) if
+// applicable.  If successful, methods on the returned Accessor can be used for
+// I/O.  It returns the Accessor and an Error, if any.
+//
+// NOTE: The returned Accessor implements BeginUpdate and EndUpdate as a no op.
+func NewFile(name string, flag int, perm os.FileMode) (store Accessor, err error) {
+	var f FileAccessor
+	if f.File, err = os.OpenFile(name, flag, perm); err == nil {
+		store = &f
+	}
+	return
+}
+
+// OpenFile returns an Accessor backed by an existing os.File named name, It
+// opens the named file with specified flag (os.O_RDWR etc.) and perm, (0666
+// etc.) if applicable.  If successful, methods on the returned Accessor can be
+// used for I/O.  It returns the Accessor and an Error, if any.
+//
+// NOTE: The returned Accessor implements BeginUpdate and EndUpdate as a no op.
+func OpenFile(name string, flag int, perm os.FileMode) (store Accessor, err error) {
+	var f FileAccessor
+	if f.File, err = os.OpenFile(name, flag, perm); err == nil {
+		store = &f
+	}
+	return
+}