443 lines
11 KiB
Go
443 lines
11 KiB
Go
// 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 memfs_test
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import (
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"io/ioutil"
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"log"
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"os"
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"os/user"
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"path"
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"strconv"
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"strings"
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"syscall"
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"testing"
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"time"
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"github.com/jacobsa/fuse"
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"github.com/jacobsa/fuse/samples/memfs"
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"github.com/jacobsa/gcsfuse/timeutil"
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. "github.com/jacobsa/oglematchers"
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. "github.com/jacobsa/ogletest"
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"golang.org/x/net/context"
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)
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func TestMemFS(t *testing.T) { RunTests(t) }
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////////////////////////////////////////////////////////////////////////
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// Helpers
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////////////////////////////////////////////////////////////////////////
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func currentUid() uint32 {
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user, err := user.Current()
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if err != nil {
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panic(err)
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}
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uid, err := strconv.ParseUint(user.Uid, 10, 32)
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if err != nil {
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panic(err)
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}
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return uint32(uid)
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}
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func currentGid() uint32 {
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user, err := user.Current()
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if err != nil {
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panic(err)
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}
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gid, err := strconv.ParseUint(user.Gid, 10, 32)
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if err != nil {
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panic(err)
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}
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return uint32(gid)
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}
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func timespecToTime(ts syscall.Timespec) time.Time {
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return time.Unix(ts.Sec, ts.Nsec)
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}
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////////////////////////////////////////////////////////////////////////
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// Boilerplate
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////////////////////////////////////////////////////////////////////////
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type MemFSTest struct {
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clock timeutil.SimulatedClock
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mfs *fuse.MountedFileSystem
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}
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var _ SetUpInterface = &MemFSTest{}
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var _ TearDownInterface = &MemFSTest{}
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func init() { RegisterTestSuite(&MemFSTest{}) }
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func (t *MemFSTest) SetUp(ti *TestInfo) {
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var err error
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// Set up a fixed, non-zero time.
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t.clock.SetTime(time.Now())
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// Set up a temporary directory for mounting.
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mountPoint, err := ioutil.TempDir("", "memfs_test")
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if err != nil {
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panic("ioutil.TempDir: " + err.Error())
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}
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// Mount a file system.
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fs := memfs.NewMemFS(&t.clock)
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if t.mfs, err = fuse.Mount(mountPoint, fs); err != nil {
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panic("Mount: " + err.Error())
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}
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if err = t.mfs.WaitForReady(context.Background()); err != nil {
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panic("MountedFileSystem.WaitForReady: " + err.Error())
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}
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}
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func (t *MemFSTest) TearDown() {
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// Unmount the file system. Try again on "resource busy" errors.
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delay := 10 * time.Millisecond
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for {
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err := t.mfs.Unmount()
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if err == nil {
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break
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}
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if strings.Contains(err.Error(), "resource busy") {
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log.Println("Resource busy error while unmounting; trying again")
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time.Sleep(delay)
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delay = time.Duration(1.3 * float64(delay))
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continue
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}
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panic("MountedFileSystem.Unmount: " + err.Error())
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}
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if err := t.mfs.Join(context.Background()); err != nil {
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panic("MountedFileSystem.Join: " + err.Error())
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}
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}
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////////////////////////////////////////////////////////////////////////
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// Test functions
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////////////////////////////////////////////////////////////////////////
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func (t *MemFSTest) ContentsOfEmptyFileSystem() {
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entries, err := ioutil.ReadDir(t.mfs.Dir())
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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}
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func (t *MemFSTest) Mkdir_OneLevel() {
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var err error
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var fi os.FileInfo
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var stat *syscall.Stat_t
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var entries []os.FileInfo
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dirName := path.Join(t.mfs.Dir(), "dir")
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// Create a directory within the root.
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createTime := t.clock.Now()
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err = os.Mkdir(dirName, 0754)
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AssertEq(nil, err)
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// Simulate time advancing.
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t.clock.AdvanceTime(time.Second)
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// Stat the directory.
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fi, err = os.Stat(dirName)
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("dir", fi.Name())
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ExpectEq(0, fi.Size())
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ExpectEq(os.ModeDir|0754, fi.Mode())
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ExpectEq(0, fi.ModTime().Sub(createTime))
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ExpectTrue(fi.IsDir())
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ExpectNe(0, stat.Ino)
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ExpectEq(1, stat.Nlink)
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ExpectEq(currentUid(), stat.Uid)
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ExpectEq(currentGid(), stat.Gid)
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ExpectEq(0, stat.Size)
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ExpectEq(0, timespecToTime(stat.Atimespec).Sub(createTime))
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ExpectEq(0, timespecToTime(stat.Mtimespec).Sub(createTime))
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ExpectEq(0, timespecToTime(stat.Ctimespec).Sub(createTime))
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// Read the directory.
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entries, err = ioutil.ReadDir(dirName)
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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// Read the root.
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entries, err = ioutil.ReadDir(t.mfs.Dir())
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AssertEq(nil, err)
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AssertEq(1, len(entries))
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fi = entries[0]
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ExpectEq("dir", fi.Name())
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ExpectEq(os.ModeDir|0754, fi.Mode())
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}
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func (t *MemFSTest) Mkdir_TwoLevels() {
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var err error
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var fi os.FileInfo
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var stat *syscall.Stat_t
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var entries []os.FileInfo
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// Create a directory within the root.
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err = os.Mkdir(path.Join(t.mfs.Dir(), "parent"), 0700)
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AssertEq(nil, err)
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// Create a child of that directory.
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createTime := t.clock.Now()
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err = os.Mkdir(path.Join(t.mfs.Dir(), "parent/dir"), 0754)
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AssertEq(nil, err)
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// Simulate time advancing.
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t.clock.AdvanceTime(time.Second)
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// Stat the directory.
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fi, err = os.Stat(path.Join(t.mfs.Dir(), "parent/dir"))
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("dir", fi.Name())
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ExpectEq(0, fi.Size())
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ExpectEq(os.ModeDir|0754, fi.Mode())
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ExpectEq(0, fi.ModTime().Sub(createTime))
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ExpectTrue(fi.IsDir())
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ExpectNe(0, stat.Ino)
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ExpectEq(1, stat.Nlink)
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ExpectEq(currentUid(), stat.Uid)
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ExpectEq(currentGid(), stat.Gid)
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ExpectEq(0, stat.Size)
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ExpectEq(0, timespecToTime(stat.Atimespec).Sub(createTime))
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ExpectEq(0, timespecToTime(stat.Mtimespec).Sub(createTime))
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ExpectEq(0, timespecToTime(stat.Ctimespec).Sub(createTime))
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// Read the directory.
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entries, err = ioutil.ReadDir(path.Join(t.mfs.Dir(), "parent/dir"))
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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// Read the parent.
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entries, err = ioutil.ReadDir(path.Join(t.mfs.Dir(), "parent"))
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AssertEq(nil, err)
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AssertEq(1, len(entries))
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fi = entries[0]
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ExpectEq("dir", fi.Name())
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ExpectEq(os.ModeDir|0754, fi.Mode())
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}
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func (t *MemFSTest) Mkdir_AlreadyExists() {
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var err error
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dirName := path.Join(t.mfs.Dir(), "dir")
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// Create the directory once.
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err = os.Mkdir(dirName, 0754)
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AssertEq(nil, err)
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// Attempt to create it again.
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err = os.Mkdir(dirName, 0754)
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("exists")))
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}
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func (t *MemFSTest) Mkdir_IntermediateIsFile() {
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var err error
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// Create a file.
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fileName := path.Join(t.mfs.Dir(), "foo")
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err = ioutil.WriteFile(fileName, []byte{}, 0700)
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AssertEq(nil, err)
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// Attempt to create a directory within the file.
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dirName := path.Join(fileName, "dir")
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err = os.Mkdir(dirName, 0754)
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("TODO")))
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}
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func (t *MemFSTest) Mkdir_IntermediateIsNonExistent() {
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var err error
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// Attempt to create a sub-directory of a non-existent sub-directory.
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dirName := path.Join(t.mfs.Dir(), "foo/dir")
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err = os.Mkdir(dirName, 0754)
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("no such file or directory")))
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}
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func (t *MemFSTest) Mkdir_PermissionDenied() {
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var err error
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// Create a directory within the root without write permissions.
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err = os.Mkdir(path.Join(t.mfs.Dir(), "parent"), 0500)
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AssertEq(nil, err)
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// Attempt to create a child of that directory.
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err = os.Mkdir(path.Join(t.mfs.Dir(), "parent/dir"), 0754)
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("permission denied")))
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}
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func (t *MemFSTest) CreateNewFile_InRoot() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) CreateNewFile_InSubDir() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) ModifyExistingFile_InRoot() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) ModifyExistingFile_InSubDir() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) UnlinkFile_Exists() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) UnlinkFile_NotAFile() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) UnlinkFile_NonExistent() {
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AssertTrue(false, "TODO")
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}
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func (t *MemFSTest) Rmdir_NonEmpty() {
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var err error
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// Create two levels of directories.
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err = os.MkdirAll(path.Join(t.mfs.Dir(), "foo/bar"), 0754)
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AssertEq(nil, err)
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// Attempt to remove the parent.
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err = os.Remove(path.Join(t.mfs.Dir(), "foo"))
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("not empty")))
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}
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func (t *MemFSTest) Rmdir_Empty() {
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var err error
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var entries []os.FileInfo
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// Create two levels of directories.
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err = os.MkdirAll(path.Join(t.mfs.Dir(), "foo/bar"), 0754)
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AssertEq(nil, err)
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// Remove the leaf.
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err = os.Remove(path.Join(t.mfs.Dir(), "foo/bar"))
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AssertEq(nil, err)
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// There should be nothing left in the parent.
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entries, err = ioutil.ReadDir(path.Join(t.mfs.Dir(), "foo"))
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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// Remove the parent.
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err = os.Remove(path.Join(t.mfs.Dir(), "foo"))
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AssertEq(nil, err)
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// Now the root directory should be empty, too.
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entries, err = ioutil.ReadDir(t.mfs.Dir())
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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}
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func (t *MemFSTest) Rmdir_NonExistent() {
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err := os.Remove(path.Join(t.mfs.Dir(), "blah"))
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("no such file or directory")))
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}
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func (t *MemFSTest) Rmdir_OpenedForReading() {
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var err error
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// Create a directory.
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createTime := t.clock.Now()
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err = os.Mkdir(path.Join(t.mfs.Dir(), "dir"), 0700)
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AssertEq(nil, err)
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// Simulate time advancing.
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t.clock.AdvanceTime(time.Second)
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// Open the directory for reading.
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f, err := os.Open(path.Join(t.mfs.Dir(), "dir"))
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defer func() {
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if f != nil {
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ExpectEq(nil, f.Close())
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}
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}()
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AssertEq(nil, err)
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// Remove the directory.
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err = os.Remove(path.Join(t.mfs.Dir(), "dir"))
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AssertEq(nil, err)
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// Create a new directory, with the same name even, and add some contents
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// within it.
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err = os.MkdirAll(path.Join(t.mfs.Dir(), "dir/foo"), 0700)
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AssertEq(nil, err)
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err = os.MkdirAll(path.Join(t.mfs.Dir(), "dir/bar"), 0700)
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AssertEq(nil, err)
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err = os.MkdirAll(path.Join(t.mfs.Dir(), "dir/baz"), 0700)
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AssertEq(nil, err)
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// We should still be able to stat the open file handle. It should show up as
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// unlinked.
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fi, err := f.Stat()
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ExpectEq("dir", fi.Name())
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ExpectEq(0, fi.ModTime().Sub(createTime))
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// TODO(jacobsa): Re-enable this assertion if the following issue is fixed:
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// https://github.com/bazillion/fuse/issues/66
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// ExpectEq(0, fi.Sys().(*syscall.Stat_t).Nlink)
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// Attempt to read from the directory. This should succeed even though it has
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// been unlinked, and we shouldn't see any junk from the new directory.
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entries, err := f.Readdir(0)
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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}
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