229 lines
5.7 KiB
Go
229 lines
5.7 KiB
Go
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// Copyright 2019 The gVisor Authors.
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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 uds contains helpers for testing external UDS functionality.
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package uds
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"syscall"
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"gvisor.dev/gvisor/pkg/log"
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"gvisor.dev/gvisor/pkg/unet"
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)
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// createEchoSocket creates a socket that echoes back anything received.
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//
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// Only works for stream, seqpacket sockets.
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func createEchoSocket(path string, protocol int) (cleanup func(), err error) {
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fd, err := syscall.Socket(syscall.AF_UNIX, protocol, 0)
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if err != nil {
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return nil, fmt.Errorf("error creating echo(%d) socket: %v", protocol, err)
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}
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if err := syscall.Bind(fd, &syscall.SockaddrUnix{Name: path}); err != nil {
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return nil, fmt.Errorf("error binding echo(%d) socket: %v", protocol, err)
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}
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if err := syscall.Listen(fd, 0); err != nil {
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return nil, fmt.Errorf("error listening echo(%d) socket: %v", protocol, err)
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}
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server, err := unet.NewServerSocket(fd)
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if err != nil {
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return nil, fmt.Errorf("error creating echo(%d) unet socket: %v", protocol, err)
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}
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acceptAndEchoOne := func() error {
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s, err := server.Accept()
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if err != nil {
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return fmt.Errorf("failed to accept: %v", err)
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}
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defer s.Close()
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for {
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buf := make([]byte, 512)
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for {
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n, err := s.Read(buf)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return fmt.Errorf("failed to read: %d, %v", n, err)
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}
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n, err = s.Write(buf[:n])
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if err != nil {
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return fmt.Errorf("failed to write: %d, %v", n, err)
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}
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}
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}
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}
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go func() {
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for {
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if err := acceptAndEchoOne(); err != nil {
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log.Warningf("Failed to handle echo(%d) socket: %v", protocol, err)
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return
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}
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}
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}()
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cleanup = func() {
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if err := server.Close(); err != nil {
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log.Warningf("Failed to close echo(%d) socket: %v", protocol, err)
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}
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}
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return cleanup, nil
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}
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// createNonListeningSocket creates a socket that is bound but not listening.
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//
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// Only relevant for stream, seqpacket sockets.
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func createNonListeningSocket(path string, protocol int) (cleanup func(), err error) {
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fd, err := syscall.Socket(syscall.AF_UNIX, protocol, 0)
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if err != nil {
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return nil, fmt.Errorf("error creating nonlistening(%d) socket: %v", protocol, err)
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}
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if err := syscall.Bind(fd, &syscall.SockaddrUnix{Name: path}); err != nil {
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return nil, fmt.Errorf("error binding nonlistening(%d) socket: %v", protocol, err)
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}
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cleanup = func() {
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if err := syscall.Close(fd); err != nil {
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log.Warningf("Failed to close nonlistening(%d) socket: %v", protocol, err)
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}
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}
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return cleanup, nil
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}
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// createNullSocket creates a socket that reads anything received.
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//
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// Only works for dgram sockets.
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func createNullSocket(path string, protocol int) (cleanup func(), err error) {
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fd, err := syscall.Socket(syscall.AF_UNIX, protocol, 0)
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if err != nil {
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return nil, fmt.Errorf("error creating null(%d) socket: %v", protocol, err)
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}
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if err := syscall.Bind(fd, &syscall.SockaddrUnix{Name: path}); err != nil {
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return nil, fmt.Errorf("error binding null(%d) socket: %v", protocol, err)
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}
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s, err := unet.NewSocket(fd)
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if err != nil {
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return nil, fmt.Errorf("error creating null(%d) unet socket: %v", protocol, err)
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}
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go func() {
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buf := make([]byte, 512)
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for {
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n, err := s.Read(buf)
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if err != nil {
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log.Warningf("failed to read: %d, %v", n, err)
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return
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}
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}
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}()
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cleanup = func() {
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if err := s.Close(); err != nil {
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log.Warningf("Failed to close null(%d) socket: %v", protocol, err)
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}
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}
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return cleanup, nil
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}
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type socketCreator func(path string, proto int) (cleanup func(), err error)
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// CreateSocketTree creates a local tree of unix domain sockets for use in
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// testing:
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// * /stream/echo
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// * /stream/nonlistening
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// * /seqpacket/echo
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// * /seqpacket/nonlistening
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// * /dgram/null
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func CreateSocketTree(baseDir string) (dir string, cleanup func(), err error) {
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dir, err = ioutil.TempDir(baseDir, "sockets")
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if err != nil {
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return "", nil, fmt.Errorf("error creating temp dir: %v", err)
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}
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var protocols = []struct {
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protocol int
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name string
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sockets map[string]socketCreator
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}{
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{
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protocol: syscall.SOCK_STREAM,
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name: "stream",
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sockets: map[string]socketCreator{
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"echo": createEchoSocket,
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"nonlistening": createNonListeningSocket,
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},
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},
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{
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protocol: syscall.SOCK_SEQPACKET,
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name: "seqpacket",
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sockets: map[string]socketCreator{
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"echo": createEchoSocket,
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"nonlistening": createNonListeningSocket,
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},
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},
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{
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protocol: syscall.SOCK_DGRAM,
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name: "dgram",
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sockets: map[string]socketCreator{
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"null": createNullSocket,
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},
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},
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}
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var cleanups []func()
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for _, proto := range protocols {
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protoDir := filepath.Join(dir, proto.name)
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if err := os.Mkdir(protoDir, 0755); err != nil {
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return "", nil, fmt.Errorf("error creating %s dir: %v", proto.name, err)
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}
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for name, fn := range proto.sockets {
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path := filepath.Join(protoDir, name)
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cleanup, err := fn(path, proto.protocol)
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if err != nil {
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return "", nil, fmt.Errorf("error creating %s %s socket: %v", proto.name, name, err)
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}
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cleanups = append(cleanups, cleanup)
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}
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}
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cleanup = func() {
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for _, c := range cleanups {
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c()
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}
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os.RemoveAll(dir)
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}
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return dir, cleanup, nil
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}
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