Added a test for various file system error conditions.
This reproduces the writeMessage errors from GoogleCloudPlatform/gcsfuse#101.geesefs-0-30-9
Aaron Jacobs
commit
589f6c3c98
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package errorfs
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import (
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"fmt"
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"os"
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"reflect"
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"sync"
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"syscall"
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"golang.org/x/net/context"
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"github.com/jacobsa/fuse/fuseops"
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"github.com/jacobsa/fuse/fuseutil"
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)
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const FooContents = "xxxx"
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const fooInodeID = fuseops.RootInodeID + 1
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var fooAttrs = fuseops.InodeAttributes{
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Nlink: 1,
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Size: uint64(len(FooContents)),
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Mode: 0444,
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}
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// A file system whose sole contents are a file named "foo" containing the
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// string defined by FooContents.
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//
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// The file system can be configured to returned canned errors for particular
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// operations using the method SetError.
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type FS interface {
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fuseutil.FileSystem
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// Cause the file system to return the supplied error for all future
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// operations matching the supplied type.
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SetError(t reflect.Type, err syscall.Errno)
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}
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func New() (fs FS, err error) {
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fs = &errorFS{
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errors: make(map[reflect.Type]syscall.Errno),
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}
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return
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}
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type errorFS struct {
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fuseutil.NotImplementedFileSystem
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mu sync.Mutex
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// GUARDED_BY(mu)
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errors map[reflect.Type]syscall.Errno
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) SetError(t reflect.Type, err syscall.Errno) {
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fs.mu.Lock()
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defer fs.mu.Unlock()
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fs.errors[t] = err
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) transformError(op interface{}, err *error) bool {
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fs.mu.Lock()
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defer fs.mu.Unlock()
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cannedErr, ok := fs.errors[reflect.TypeOf(op)]
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if ok {
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*err = cannedErr
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return true
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}
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return false
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}
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////////////////////////////////////////////////////////////////////////
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// File system methods
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////////////////////////////////////////////////////////////////////////
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) GetInodeAttributes(
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ctx context.Context,
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op *fuseops.GetInodeAttributesOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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// Figure out which inode the request is for.
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switch {
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case op.Inode == fuseops.RootInodeID:
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op.Attributes = fuseops.InodeAttributes{
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Mode: os.ModeDir | 0777,
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}
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case op.Inode == fooInodeID:
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op.Attributes = fooAttrs
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default:
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err = fmt.Errorf("Unknown inode: %d", op.Inode)
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return
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}
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return
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) LookUpInode(
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ctx context.Context,
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op *fuseops.LookUpInodeOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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// Is this a known inode?
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if !(op.Parent == fuseops.RootInodeID && op.Name == "foo") {
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err = syscall.ENOENT
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return
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}
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op.Entry.Child = fooInodeID
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op.Entry.Attributes = fooAttrs
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return
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) OpenFile(
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ctx context.Context,
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op *fuseops.OpenFileOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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if op.Inode != fooInodeID {
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err = fmt.Errorf("Unsupported inode ID: %d", op.Inode)
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return
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}
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return
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) ReadFile(
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ctx context.Context,
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op *fuseops.ReadFileOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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if op.Inode != fooInodeID || op.Offset != 0 {
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err = fmt.Errorf("Unexpected request: %#v", op)
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return
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}
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op.BytesRead = copy(op.Dst, FooContents)
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return
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) OpenDir(
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ctx context.Context,
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op *fuseops.OpenDirOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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if op.Inode != fuseops.RootInodeID {
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err = fmt.Errorf("Unsupported inode ID: %d", op.Inode)
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return
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}
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return
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}
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// LOCKS_EXCLUDED(fs.mu)
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func (fs *errorFS) ReadDir(
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ctx context.Context,
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op *fuseops.ReadDirOp) (err error) {
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if fs.transformError(op, &err) {
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return
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}
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if op.Inode != fuseops.RootInodeID || op.Offset != 0 {
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err = fmt.Errorf("Unexpected request: %#v", op)
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return
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}
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op.BytesRead = fuseutil.WriteDirent(
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op.Dst,
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fuseutil.Dirent{
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Offset: 0,
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Inode: fooInodeID,
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Name: "foo",
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Type: fuseutil.DT_File,
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})
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return
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}
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@ -0,0 +1,102 @@
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package errorfs_test
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import (
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"io/ioutil"
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"os"
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"path"
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"reflect"
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"syscall"
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"testing"
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"github.com/jacobsa/fuse/fuseops"
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"github.com/jacobsa/fuse/fuseutil"
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"github.com/jacobsa/fuse/samples"
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"github.com/jacobsa/fuse/samples/errorfs"
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. "github.com/jacobsa/oglematchers"
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. "github.com/jacobsa/ogletest"
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)
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func TestErrorFS(t *testing.T) { RunTests(t) }
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////////////////////////////////////////////////////////////////////////
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// Boilerplate
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////////////////////////////////////////////////////////////////////////
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type ErrorFSTest struct {
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samples.SampleTest
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fs errorfs.FS
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}
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func init() { RegisterTestSuite(&ErrorFSTest{}) }
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var _ SetUpInterface = &ErrorFSTest{}
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var _ TearDownInterface = &ErrorFSTest{}
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func (t *ErrorFSTest) SetUp(ti *TestInfo) {
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var err error
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// Create the file system.
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t.fs, err = errorfs.New()
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AssertEq(nil, err)
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t.Server = fuseutil.NewFileSystemServer(t.fs)
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// Mount it.
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t.SampleTest.SetUp(ti)
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}
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////////////////////////////////////////////////////////////////////////
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// Tests
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////////////////////////////////////////////////////////////////////////
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func (t *ErrorFSTest) OpenFile() {
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t.fs.SetError(reflect.TypeOf(&fuseops.OpenFileOp{}), syscall.EOWNERDEAD)
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_, err := os.Open(path.Join(t.Dir, "foo"))
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ExpectThat(err, Error(MatchesRegexp("open.*: .*owner died")))
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}
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func (t *ErrorFSTest) ReadFile() {
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t.fs.SetError(reflect.TypeOf(&fuseops.ReadFileOp{}), syscall.EOWNERDEAD)
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// Open
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f, err := os.Open(path.Join(t.Dir, "foo"))
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AssertEq(nil, err)
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// Read
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_, err = ioutil.ReadAll(f)
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ExpectThat(err, Error(MatchesRegexp("read.*: .*owner died")))
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}
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func (t *ErrorFSTest) OpenDir() {
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t.fs.SetError(reflect.TypeOf(&fuseops.OpenDirOp{}), syscall.EOWNERDEAD)
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_, err := os.Open(t.Dir)
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ExpectThat(err, Error(MatchesRegexp("open.*: .*owner died")))
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}
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func (t *ErrorFSTest) ReadDir() {
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t.fs.SetError(reflect.TypeOf(&fuseops.ReadDirOp{}), syscall.EOWNERDEAD)
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// Open
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f, err := os.Open(t.Dir)
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AssertEq(nil, err)
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// Read
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_, err = f.Readdirnames(1)
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ExpectThat(err, Error(MatchesRegexp("read.*: .*owner died")))
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}
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