/usr/share/gocode/src/github.com/jacobsa/fuse/samples/errorfs/error_fs.go is in golang-github-jacobsa-fuse-dev 0.0~git20150806.0.9a7512a-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | // Copyright 2015 Google 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 errorfs
import (
"fmt"
"os"
"reflect"
"sync"
"syscall"
"golang.org/x/net/context"
"github.com/jacobsa/fuse/fuseops"
"github.com/jacobsa/fuse/fuseutil"
)
const FooContents = "xxxx"
const fooInodeID = fuseops.RootInodeID + 1
var fooAttrs = fuseops.InodeAttributes{
Nlink: 1,
Size: uint64(len(FooContents)),
Mode: 0444,
}
// A file system whose sole contents are a file named "foo" containing the
// string defined by FooContents.
//
// The file system can be configured to returned canned errors for particular
// operations using the method SetError.
type FS interface {
fuseutil.FileSystem
// Cause the file system to return the supplied error for all future
// operations matching the supplied type.
SetError(t reflect.Type, err syscall.Errno)
}
func New() (fs FS, err error) {
fs = &errorFS{
errors: make(map[reflect.Type]syscall.Errno),
}
return
}
type errorFS struct {
fuseutil.NotImplementedFileSystem
mu sync.Mutex
// GUARDED_BY(mu)
errors map[reflect.Type]syscall.Errno
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) SetError(t reflect.Type, err syscall.Errno) {
fs.mu.Lock()
defer fs.mu.Unlock()
fs.errors[t] = err
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) transformError(op interface{}, err *error) bool {
fs.mu.Lock()
defer fs.mu.Unlock()
cannedErr, ok := fs.errors[reflect.TypeOf(op)]
if ok {
*err = cannedErr
return true
}
return false
}
////////////////////////////////////////////////////////////////////////
// File system methods
////////////////////////////////////////////////////////////////////////
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) GetInodeAttributes(
ctx context.Context,
op *fuseops.GetInodeAttributesOp) (err error) {
if fs.transformError(op, &err) {
return
}
// Figure out which inode the request is for.
switch {
case op.Inode == fuseops.RootInodeID:
op.Attributes = fuseops.InodeAttributes{
Mode: os.ModeDir | 0777,
}
case op.Inode == fooInodeID:
op.Attributes = fooAttrs
default:
err = fmt.Errorf("Unknown inode: %d", op.Inode)
return
}
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) LookUpInode(
ctx context.Context,
op *fuseops.LookUpInodeOp) (err error) {
if fs.transformError(op, &err) {
return
}
// Is this a known inode?
if !(op.Parent == fuseops.RootInodeID && op.Name == "foo") {
err = syscall.ENOENT
return
}
op.Entry.Child = fooInodeID
op.Entry.Attributes = fooAttrs
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) OpenFile(
ctx context.Context,
op *fuseops.OpenFileOp) (err error) {
if fs.transformError(op, &err) {
return
}
if op.Inode != fooInodeID {
err = fmt.Errorf("Unsupported inode ID: %d", op.Inode)
return
}
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) ReadFile(
ctx context.Context,
op *fuseops.ReadFileOp) (err error) {
if fs.transformError(op, &err) {
return
}
if op.Inode != fooInodeID || op.Offset != 0 {
err = fmt.Errorf("Unexpected request: %#v", op)
return
}
op.BytesRead = copy(op.Dst, FooContents)
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) OpenDir(
ctx context.Context,
op *fuseops.OpenDirOp) (err error) {
if fs.transformError(op, &err) {
return
}
if op.Inode != fuseops.RootInodeID {
err = fmt.Errorf("Unsupported inode ID: %d", op.Inode)
return
}
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *errorFS) ReadDir(
ctx context.Context,
op *fuseops.ReadDirOp) (err error) {
if fs.transformError(op, &err) {
return
}
if op.Inode != fuseops.RootInodeID || op.Offset != 0 {
err = fmt.Errorf("Unexpected request: %#v", op)
return
}
op.BytesRead = fuseutil.WriteDirent(
op.Dst,
fuseutil.Dirent{
Offset: 0,
Inode: fooInodeID,
Name: "foo",
Type: fuseutil.DT_File,
})
return
}
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