2 files changed, 80 insertions, 0 deletions
diff --git a/pkg/sentry/fs/filetest/BUILD b/pkg/sentry/fs/filetest/BUILD
new file mode 100644
index 000000000..a8000e010
--- /dev/null
+++ b/pkg/sentry/fs/filetest/BUILD
@@ -0,0 +1,19 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "filetest",
+    testonly = 1,
+    srcs = ["filetest.go"],
+    visibility = ["//pkg/sentry:internal"],
+    deps = [
+        "//pkg/context",
+        "//pkg/sentry/contexttest",
+        "//pkg/sentry/fs",
+        "//pkg/sentry/fs/anon",
+        "//pkg/sentry/fs/fsutil",
+        "//pkg/usermem",
+        "//pkg/waiter",
+    ],
+)
diff --git a/pkg/sentry/fs/filetest/filetest.go b/pkg/sentry/fs/filetest/filetest.go
new file mode 100644
index 000000000..8049538f2
--- /dev/null
+++ b/pkg/sentry/fs/filetest/filetest.go
@@ -0,0 +1,61 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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 filetest provides a test implementation of an fs.File.
+package filetest
+
+import (
+	"fmt"
+	"testing"
+
+	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/sentry/contexttest"
+	"gvisor.dev/gvisor/pkg/sentry/fs"
+	"gvisor.dev/gvisor/pkg/sentry/fs/anon"
+	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
+	"gvisor.dev/gvisor/pkg/usermem"
+	"gvisor.dev/gvisor/pkg/waiter"
+)
+
+// TestFileOperations is an implementation of the File interface. It provides all
+// required methods.
+type TestFileOperations struct {
+	fsutil.FileNoopRelease          `state:"nosave"`
+	fsutil.FilePipeSeek             `state:"nosave"`
+	fsutil.FileNotDirReaddir        `state:"nosave"`
+	fsutil.FileNoFsync              `state:"nosave"`
+	fsutil.FileNoopFlush            `state:"nosave"`
+	fsutil.FileNoMMap               `state:"nosave"`
+	fsutil.FileNoIoctl              `state:"nosave"`
+	fsutil.FileNoSplice             `state:"nosave"`
+	fsutil.FileUseInodeUnstableAttr `state:"nosave"`
+	waiter.AlwaysReady              `state:"nosave"`
+}
+
+// NewTestFile creates and initializes a new test file.
+func NewTestFile(tb testing.TB) *fs.File {
+	ctx := contexttest.Context(tb)
+	dirent := fs.NewDirent(ctx, anon.NewInode(ctx), "test")
+	return fs.NewFile(ctx, dirent, fs.FileFlags{}, &TestFileOperations{})
+}
+
+// Read just fails the request.
+func (*TestFileOperations) Read(context.Context, *fs.File, usermem.IOSequence, int64) (int64, error) {
+	return 0, fmt.Errorf("Readv not implemented")
+}
+
+// Write just fails the request.
+func (*TestFileOperations) Write(context.Context, *fs.File, usermem.IOSequence, int64) (int64, error) {
+	return 0, fmt.Errorf("Writev not implemented")
+}