1117 lines
26 KiB
Go
1117 lines
26 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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"bytes"
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"io"
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"io/ioutil"
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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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"syscall"
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"testing"
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"time"
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"github.com/jacobsa/fuse/fusetesting"
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"github.com/jacobsa/fuse/samples"
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"github.com/jacobsa/fuse/samples/memfs"
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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 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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// Transform the supplied mode by the current umask.
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func applyUmask(m os.FileMode) os.FileMode {
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// HACK(jacobsa): Use umask(2) to change and restore the umask in order to
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// figure out what the mask is. See the listing in `man getumask`.
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umask := syscall.Umask(0)
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syscall.Umask(umask)
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// Apply it.
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return m &^ os.FileMode(umask)
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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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samples.SampleTest
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}
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func init() { RegisterTestSuite(&MemFSTest{}) }
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func (t *MemFSTest) SetUp(ti *TestInfo) {
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t.Server = memfs.NewMemFS(currentUid(), currentGid(), &t.Clock)
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t.SampleTest.SetUp(ti)
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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 := fusetesting.ReadDirPicky(t.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.Dir, "dir")
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// Simulate time advancing.
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t.Clock.AdvanceTime(time.Second)
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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|applyUmask(0754), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(createTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(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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// Check the root's mtime.
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fi, err = os.Stat(t.Dir)
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AssertEq(nil, err)
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ExpectEq(0, fi.ModTime().Sub(createTime))
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// Read the directory.
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entries, err = fusetesting.ReadDirPicky(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 = fusetesting.ReadDirPicky(t.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|applyUmask(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.Dir, "parent"), 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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// Create a child of that directory.
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createTime := t.Clock.Now()
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err = os.Mkdir(path.Join(t.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.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|applyUmask(0754), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(createTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(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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// Check the parent's mtime.
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fi, err = os.Stat(path.Join(t.Dir, "parent"))
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AssertEq(nil, err)
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ExpectEq(0, fi.ModTime().Sub(createTime))
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// Read the directory.
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entries, err = fusetesting.ReadDirPicky(path.Join(t.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 = fusetesting.ReadDirPicky(path.Join(t.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|applyUmask(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.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.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("not a directory")))
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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.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.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.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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var err error
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var fi os.FileInfo
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var stat *syscall.Stat_t
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// Write a file.
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fileName := path.Join(t.Dir, "foo")
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const contents = "Hello\x00world"
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createTime := t.Clock.Now()
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err = ioutil.WriteFile(fileName, []byte(contents), 0400)
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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 it.
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fi, err = os.Stat(fileName)
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("foo", fi.Name())
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ExpectEq(len(contents), fi.Size())
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ExpectEq(applyUmask(0400), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(createTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(createTime))
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ExpectFalse(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(len(contents), stat.Size)
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// Read it back.
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slice, err := ioutil.ReadFile(fileName)
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AssertEq(nil, err)
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ExpectEq(contents, string(slice))
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}
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func (t *MemFSTest) CreateNewFile_InSubDir() {
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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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// Create a sub-dir.
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dirName := path.Join(t.Dir, "dir")
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err = os.Mkdir(dirName, 0700)
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AssertEq(nil, err)
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// Write a file.
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fileName := path.Join(dirName, "foo")
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const contents = "Hello\x00world"
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createTime := t.Clock.Now()
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err = ioutil.WriteFile(fileName, []byte(contents), 0400)
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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 it.
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fi, err = os.Stat(fileName)
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("foo", fi.Name())
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ExpectEq(len(contents), fi.Size())
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ExpectEq(applyUmask(0400), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(createTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(createTime))
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ExpectFalse(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(len(contents), stat.Size)
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// Read it back.
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slice, err := ioutil.ReadFile(fileName)
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AssertEq(nil, err)
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ExpectEq(contents, string(slice))
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}
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func (t *MemFSTest) ModifyExistingFile_InRoot() {
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var err error
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var n int
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var fi os.FileInfo
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var stat *syscall.Stat_t
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// Write a file.
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fileName := path.Join(t.Dir, "foo")
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createTime := t.Clock.Now()
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err = ioutil.WriteFile(fileName, []byte("Hello, world!"), 0600)
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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 file and modify it.
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f, err := os.OpenFile(fileName, os.O_WRONLY, 0400)
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t.ToClose = append(t.ToClose, f)
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AssertEq(nil, err)
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modifyTime := t.Clock.Now()
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n, err = f.WriteAt([]byte("H"), 0)
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AssertEq(nil, err)
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AssertEq(1, n)
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// Simulate time advancing.
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t.Clock.AdvanceTime(time.Second)
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// Stat the file.
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fi, err = os.Stat(fileName)
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("foo", fi.Name())
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ExpectEq(len("Hello, world!"), fi.Size())
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ExpectEq(applyUmask(0600), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(modifyTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(createTime))
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ExpectFalse(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(len("Hello, world!"), stat.Size)
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// Read the file back.
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slice, err := ioutil.ReadFile(fileName)
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AssertEq(nil, err)
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ExpectEq("Hello, world!", string(slice))
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}
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func (t *MemFSTest) ModifyExistingFile_InSubDir() {
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var err error
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var n int
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var fi os.FileInfo
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var stat *syscall.Stat_t
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// Create a sub-directory.
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dirName := path.Join(t.Dir, "dir")
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err = os.Mkdir(dirName, 0700)
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AssertEq(nil, err)
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// Write a file.
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fileName := path.Join(dirName, "foo")
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createTime := t.Clock.Now()
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err = ioutil.WriteFile(fileName, []byte("Hello, world!"), 0600)
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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 file and modify it.
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f, err := os.OpenFile(fileName, os.O_WRONLY, 0400)
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t.ToClose = append(t.ToClose, f)
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AssertEq(nil, err)
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modifyTime := t.Clock.Now()
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n, err = f.WriteAt([]byte("H"), 0)
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AssertEq(nil, err)
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AssertEq(1, n)
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// Simulate time advancing.
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t.Clock.AdvanceTime(time.Second)
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// Stat the file.
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fi, err = os.Stat(fileName)
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stat = fi.Sys().(*syscall.Stat_t)
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AssertEq(nil, err)
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ExpectEq("foo", fi.Name())
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ExpectEq(len("Hello, world!"), fi.Size())
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ExpectEq(applyUmask(0600), fi.Mode())
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ExpectThat(fi, fusetesting.MtimeIs(modifyTime))
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ExpectThat(fi, fusetesting.BirthtimeIs(createTime))
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ExpectFalse(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(len("Hello, world!"), stat.Size)
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// Read the file back.
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slice, err := ioutil.ReadFile(fileName)
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AssertEq(nil, err)
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ExpectEq("Hello, world!", string(slice))
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}
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func (t *MemFSTest) UnlinkFile_Exists() {
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var err error
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// Write a file.
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fileName := path.Join(t.Dir, "foo")
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err = ioutil.WriteFile(fileName, []byte("Hello, world!"), 0600)
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AssertEq(nil, err)
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// Unlink it.
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err = os.Remove(fileName)
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AssertEq(nil, err)
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// Statting it should fail.
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_, err = os.Stat(fileName)
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("no such file")))
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// Nothing should be in the directory.
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entries, err := fusetesting.ReadDirPicky(t.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) UnlinkFile_NonExistent() {
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err := os.Remove(path.Join(t.Dir, "foo"))
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AssertNe(nil, err)
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ExpectThat(err, Error(HasSubstr("no such file")))
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}
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func (t *MemFSTest) UnlinkFile_StillOpen() {
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fileName := path.Join(t.Dir, "foo")
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// Create and open a file.
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f, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0600)
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t.ToClose = append(t.ToClose, f)
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AssertEq(nil, err)
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// Write some data into it.
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n, err := f.Write([]byte("taco"))
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AssertEq(nil, err)
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AssertEq(4, n)
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// Unlink it.
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err = os.Remove(fileName)
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AssertEq(nil, err)
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// The directory should no longer contain it.
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entries, err := fusetesting.ReadDirPicky(t.Dir)
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AssertEq(nil, err)
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ExpectThat(entries, ElementsAre())
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// We should be able to stat the file. It should still show as having
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// contents, but with no links.
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fi, err := f.Stat()
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AssertEq(nil, err)
|
|
ExpectEq(4, fi.Size())
|
|
ExpectEq(0, fi.Sys().(*syscall.Stat_t).Nlink)
|
|
|
|
// The contents should still be available.
|
|
buf := make([]byte, 1024)
|
|
n, err = f.ReadAt(buf, 0)
|
|
|
|
AssertEq(io.EOF, err)
|
|
AssertEq(4, n)
|
|
ExpectEq("taco", string(buf[:4]))
|
|
|
|
// Writing should still work, too.
|
|
n, err = f.Write([]byte("burrito"))
|
|
AssertEq(nil, err)
|
|
AssertEq(len("burrito"), n)
|
|
}
|
|
|
|
func (t *MemFSTest) Rmdir_NonEmpty() {
|
|
var err error
|
|
|
|
// Create two levels of directories.
|
|
err = os.MkdirAll(path.Join(t.Dir, "foo/bar"), 0754)
|
|
AssertEq(nil, err)
|
|
|
|
// Attempt to remove the parent.
|
|
err = os.Remove(path.Join(t.Dir, "foo"))
|
|
|
|
AssertNe(nil, err)
|
|
ExpectThat(err, Error(HasSubstr("not empty")))
|
|
}
|
|
|
|
func (t *MemFSTest) Rmdir_Empty() {
|
|
var err error
|
|
var entries []os.FileInfo
|
|
|
|
// Create two levels of directories.
|
|
err = os.MkdirAll(path.Join(t.Dir, "foo/bar"), 0754)
|
|
AssertEq(nil, err)
|
|
|
|
// Simulate time advancing.
|
|
t.Clock.AdvanceTime(time.Second)
|
|
|
|
// Remove the leaf.
|
|
rmTime := t.Clock.Now()
|
|
err = os.Remove(path.Join(t.Dir, "foo/bar"))
|
|
AssertEq(nil, err)
|
|
|
|
// Simulate time advancing.
|
|
t.Clock.AdvanceTime(time.Second)
|
|
|
|
// There should be nothing left in the parent.
|
|
entries, err = fusetesting.ReadDirPicky(path.Join(t.Dir, "foo"))
|
|
|
|
AssertEq(nil, err)
|
|
ExpectThat(entries, ElementsAre())
|
|
|
|
// Check the parent's mtime.
|
|
fi, err := os.Stat(path.Join(t.Dir, "foo"))
|
|
AssertEq(nil, err)
|
|
ExpectEq(0, fi.ModTime().Sub(rmTime))
|
|
|
|
// Remove the parent.
|
|
err = os.Remove(path.Join(t.Dir, "foo"))
|
|
AssertEq(nil, err)
|
|
|
|
// Now the root directory should be empty, too.
|
|
entries, err = fusetesting.ReadDirPicky(t.Dir)
|
|
|
|
AssertEq(nil, err)
|
|
ExpectThat(entries, ElementsAre())
|
|
}
|
|
|
|
func (t *MemFSTest) Rmdir_NonExistent() {
|
|
err := os.Remove(path.Join(t.Dir, "blah"))
|
|
|
|
AssertNe(nil, err)
|
|
ExpectThat(err, Error(HasSubstr("no such file or directory")))
|
|
}
|
|
|
|
func (t *MemFSTest) Rmdir_OpenedForReading() {
|
|
var err error
|
|
|
|
// Create a directory.
|
|
createTime := t.Clock.Now()
|
|
err = os.Mkdir(path.Join(t.Dir, "dir"), 0700)
|
|
AssertEq(nil, err)
|
|
|
|
// Simulate time advancing.
|
|
t.Clock.AdvanceTime(time.Second)
|
|
|
|
// Open the directory for reading.
|
|
f, err := os.Open(path.Join(t.Dir, "dir"))
|
|
defer func() {
|
|
if f != nil {
|
|
ExpectEq(nil, f.Close())
|
|
}
|
|
}()
|
|
|
|
AssertEq(nil, err)
|
|
|
|
// Remove the directory.
|
|
err = os.Remove(path.Join(t.Dir, "dir"))
|
|
AssertEq(nil, err)
|
|
|
|
// Create a new directory, with the same name even, and add some contents
|
|
// within it.
|
|
err = os.MkdirAll(path.Join(t.Dir, "dir/foo"), 0700)
|
|
AssertEq(nil, err)
|
|
|
|
err = os.MkdirAll(path.Join(t.Dir, "dir/bar"), 0700)
|
|
AssertEq(nil, err)
|
|
|
|
err = os.MkdirAll(path.Join(t.Dir, "dir/baz"), 0700)
|
|
AssertEq(nil, err)
|
|
|
|
// We should still be able to stat the open file handle. It should show up as
|
|
// unlinked.
|
|
fi, err := f.Stat()
|
|
|
|
ExpectEq("dir", fi.Name())
|
|
ExpectEq(0, fi.ModTime().Sub(createTime))
|
|
ExpectEq(0, fi.Sys().(*syscall.Stat_t).Nlink)
|
|
|
|
// Attempt to read from the directory. This shouldn't see any junk from the
|
|
// new directory. It should either succeed with an empty result or should
|
|
// return ENOENT.
|
|
names, err := f.Readdirnames(0)
|
|
|
|
if err != nil {
|
|
ExpectThat(err, Error(HasSubstr("no such file")))
|
|
} else {
|
|
ExpectThat(names, ElementsAre())
|
|
}
|
|
}
|
|
|
|
func (t *MemFSTest) CaseSensitive() {
|
|
var err error
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(path.Join(t.Dir, "file"), []byte{}, 0400)
|
|
AssertEq(nil, err)
|
|
|
|
// Create a directory.
|
|
err = os.Mkdir(path.Join(t.Dir, "dir"), 0400)
|
|
AssertEq(nil, err)
|
|
|
|
// Attempt to stat with the wrong case.
|
|
names := []string{
|
|
"FILE",
|
|
"File",
|
|
"filE",
|
|
"DIR",
|
|
"Dir",
|
|
"dIr",
|
|
}
|
|
|
|
for _, name := range names {
|
|
_, err = os.Stat(path.Join(t.Dir, name))
|
|
AssertNe(nil, err, "Name: %s", name)
|
|
AssertThat(err, Error(HasSubstr("no such file or directory")))
|
|
}
|
|
}
|
|
|
|
func (t *MemFSTest) WriteOverlapsEndOfFile() {
|
|
var err error
|
|
var n int
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Make it 4 bytes long.
|
|
err = f.Truncate(4)
|
|
AssertEq(nil, err)
|
|
|
|
// Write the range [2, 6).
|
|
n, err = f.WriteAt([]byte("taco"), 2)
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// Read the full contents of the file.
|
|
contents, err := ioutil.ReadAll(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq("\x00\x00taco", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) WriteStartsAtEndOfFile() {
|
|
var err error
|
|
var n int
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Make it 2 bytes long.
|
|
err = f.Truncate(2)
|
|
AssertEq(nil, err)
|
|
|
|
// Write the range [2, 6).
|
|
n, err = f.WriteAt([]byte("taco"), 2)
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// Read the full contents of the file.
|
|
contents, err := ioutil.ReadAll(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq("\x00\x00taco", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) WriteStartsPastEndOfFile() {
|
|
var err error
|
|
var n int
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Write the range [2, 6).
|
|
n, err = f.WriteAt([]byte("taco"), 2)
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// Read the full contents of the file.
|
|
contents, err := ioutil.ReadAll(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq("\x00\x00taco", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) WriteAtDoesntChangeOffset_NotAppendMode() {
|
|
var err error
|
|
var n int
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Make it 16 bytes long.
|
|
err = f.Truncate(16)
|
|
AssertEq(nil, err)
|
|
|
|
// Seek to offset 4.
|
|
_, err = f.Seek(4, 0)
|
|
AssertEq(nil, err)
|
|
|
|
// Write the range [10, 14).
|
|
n, err = f.WriteAt([]byte("taco"), 2)
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// We should still be at offset 4.
|
|
offset, err := getFileOffset(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq(4, offset)
|
|
}
|
|
|
|
func (t *MemFSTest) WriteAtDoesntChangeOffset_AppendMode() {
|
|
var err error
|
|
var n int
|
|
|
|
// Create a file in append mode.
|
|
f, err := os.OpenFile(
|
|
path.Join(t.Dir, "foo"),
|
|
os.O_RDWR|os.O_APPEND|os.O_CREATE,
|
|
0600)
|
|
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Make it 16 bytes long.
|
|
err = f.Truncate(16)
|
|
AssertEq(nil, err)
|
|
|
|
// Seek to offset 4.
|
|
_, err = f.Seek(4, 0)
|
|
AssertEq(nil, err)
|
|
|
|
// Write the range [10, 14).
|
|
n, err = f.WriteAt([]byte("taco"), 2)
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// We should still be at offset 4.
|
|
offset, err := getFileOffset(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq(4, offset)
|
|
}
|
|
|
|
func (t *MemFSTest) LargeFile() {
|
|
var err error
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Copy in large contents.
|
|
const size = 1 << 24
|
|
contents := bytes.Repeat([]byte{0x20}, size)
|
|
|
|
_, err = io.Copy(f, bytes.NewReader(contents))
|
|
AssertEq(nil, err)
|
|
|
|
// Read the full contents of the file.
|
|
contents, err = ioutil.ReadFile(f.Name())
|
|
AssertEq(nil, err)
|
|
ExpectEq(size, len(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) AppendMode() {
|
|
var err error
|
|
var n int
|
|
var off int64
|
|
buf := make([]byte, 1024)
|
|
|
|
// Create a file with some contents.
|
|
fileName := path.Join(t.Dir, "foo")
|
|
err = ioutil.WriteFile(fileName, []byte("Jello, "), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Open the file in append mode.
|
|
f, err := os.OpenFile(fileName, os.O_RDWR|os.O_APPEND, 0600)
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Seek to somewhere silly and then write.
|
|
off, err = f.Seek(2, 0)
|
|
AssertEq(nil, err)
|
|
AssertEq(2, off)
|
|
|
|
n, err = f.Write([]byte("world!"))
|
|
AssertEq(nil, err)
|
|
AssertEq(6, n)
|
|
|
|
// The offset should have been updated to point at the end of the file.
|
|
off, err = getFileOffset(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq(13, off)
|
|
|
|
// A random write should still work, without updating the offset.
|
|
n, err = f.WriteAt([]byte("H"), 0)
|
|
AssertEq(nil, err)
|
|
AssertEq(1, n)
|
|
|
|
off, err = getFileOffset(f)
|
|
AssertEq(nil, err)
|
|
ExpectEq(13, off)
|
|
|
|
// Read back the contents of the file, which should be correct even though we
|
|
// seeked to a silly place before writing the world part.
|
|
//
|
|
// Linux's support for pwrite is buggy; the pwrite(2) man page says this:
|
|
//
|
|
// POSIX requires that opening a file with the O_APPEND flag should have
|
|
// no affect on the location at which pwrite() writes data. However, on
|
|
// Linux, if a file is opened with O_APPEND, pwrite() appends data to
|
|
// the end of the file, regardless of the value of offset.
|
|
//
|
|
// So we allow either the POSIX result or the Linux result.
|
|
n, err = f.ReadAt(buf, 0)
|
|
AssertEq(io.EOF, err)
|
|
ExpectThat(string(buf[:n]), AnyOf("Hello, world!", "Jello, world!H"))
|
|
}
|
|
|
|
func (t *MemFSTest) ReadsPastEndOfFile() {
|
|
var err error
|
|
var n int
|
|
buf := make([]byte, 1024)
|
|
|
|
// Create a file.
|
|
f, err := os.Create(path.Join(t.Dir, "foo"))
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Give it some contents.
|
|
n, err = f.Write([]byte("taco"))
|
|
AssertEq(nil, err)
|
|
AssertEq(4, n)
|
|
|
|
// Read a range overlapping EOF.
|
|
n, err = f.ReadAt(buf[:4], 2)
|
|
AssertEq(io.EOF, err)
|
|
ExpectEq(2, n)
|
|
ExpectEq("co", string(buf[:n]))
|
|
|
|
// Read a range starting at EOF.
|
|
n, err = f.ReadAt(buf[:4], 4)
|
|
AssertEq(io.EOF, err)
|
|
ExpectEq(0, n)
|
|
ExpectEq("", string(buf[:n]))
|
|
|
|
// Read a range starting past EOF.
|
|
n, err = f.ReadAt(buf[:4], 100)
|
|
AssertEq(io.EOF, err)
|
|
ExpectEq(0, n)
|
|
ExpectEq("", string(buf[:n]))
|
|
}
|
|
|
|
func (t *MemFSTest) Truncate_Smaller() {
|
|
var err error
|
|
fileName := path.Join(t.Dir, "foo")
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(fileName, []byte("taco"), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Open it for modification.
|
|
f, err := os.OpenFile(fileName, os.O_RDWR, 0)
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Truncate it.
|
|
err = f.Truncate(2)
|
|
AssertEq(nil, err)
|
|
|
|
// Stat it.
|
|
fi, err := f.Stat()
|
|
AssertEq(nil, err)
|
|
ExpectEq(2, fi.Size())
|
|
|
|
// Read the contents.
|
|
contents, err := ioutil.ReadFile(fileName)
|
|
AssertEq(nil, err)
|
|
ExpectEq("ta", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) Truncate_SameSize() {
|
|
var err error
|
|
fileName := path.Join(t.Dir, "foo")
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(fileName, []byte("taco"), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Open it for modification.
|
|
f, err := os.OpenFile(fileName, os.O_RDWR, 0)
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Truncate it.
|
|
err = f.Truncate(4)
|
|
AssertEq(nil, err)
|
|
|
|
// Stat it.
|
|
fi, err := f.Stat()
|
|
AssertEq(nil, err)
|
|
ExpectEq(4, fi.Size())
|
|
|
|
// Read the contents.
|
|
contents, err := ioutil.ReadFile(fileName)
|
|
AssertEq(nil, err)
|
|
ExpectEq("taco", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) Truncate_Larger() {
|
|
var err error
|
|
fileName := path.Join(t.Dir, "foo")
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(fileName, []byte("taco"), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Open it for modification.
|
|
f, err := os.OpenFile(fileName, os.O_RDWR, 0)
|
|
t.ToClose = append(t.ToClose, f)
|
|
AssertEq(nil, err)
|
|
|
|
// Truncate it.
|
|
err = f.Truncate(6)
|
|
AssertEq(nil, err)
|
|
|
|
// Stat it.
|
|
fi, err := f.Stat()
|
|
AssertEq(nil, err)
|
|
ExpectEq(6, fi.Size())
|
|
|
|
// Read the contents.
|
|
contents, err := ioutil.ReadFile(fileName)
|
|
AssertEq(nil, err)
|
|
ExpectEq("taco\x00\x00", string(contents))
|
|
}
|
|
|
|
func (t *MemFSTest) Chmod() {
|
|
var err error
|
|
fileName := path.Join(t.Dir, "foo")
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(fileName, []byte(""), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Chmod it.
|
|
err = os.Chmod(fileName, 0754)
|
|
AssertEq(nil, err)
|
|
|
|
// Stat it.
|
|
fi, err := os.Stat(fileName)
|
|
AssertEq(nil, err)
|
|
ExpectEq(0754, fi.Mode())
|
|
}
|
|
|
|
func (t *MemFSTest) Chtimes() {
|
|
var err error
|
|
fileName := path.Join(t.Dir, "foo")
|
|
|
|
// Create a file.
|
|
err = ioutil.WriteFile(fileName, []byte(""), 0600)
|
|
AssertEq(nil, err)
|
|
|
|
// Chtimes it.
|
|
expectedMtime := time.Now().Add(123 * time.Second).Round(time.Second)
|
|
err = os.Chtimes(fileName, time.Now(), expectedMtime)
|
|
AssertEq(nil, err)
|
|
|
|
// Stat it.
|
|
fi, err := os.Stat(fileName)
|
|
AssertEq(nil, err)
|
|
ExpectEq(0, fi.ModTime().Sub(expectedMtime))
|
|
}
|
|
|
|
func (t *MemFSTest) ReadDirWhileModifying() {
|
|
dirName := path.Join(t.Dir, "dir")
|
|
createFile := func(name string) {
|
|
AssertEq(nil, ioutil.WriteFile(path.Join(dirName, name), []byte{}, 0400))
|
|
}
|
|
|
|
// Create a directory.
|
|
err := os.Mkdir(dirName, 0700)
|
|
AssertEq(nil, err)
|
|
|
|
// Open the directory.
|
|
d, err := os.Open(dirName)
|
|
t.ToClose = append(t.ToClose, d)
|
|
AssertEq(nil, err)
|
|
|
|
// Add four files.
|
|
createFile("foo")
|
|
createFile("bar")
|
|
createFile("baz")
|
|
createFile("qux")
|
|
|
|
// Read one entry from the directory.
|
|
names, err := d.Readdirnames(1)
|
|
AssertEq(nil, err)
|
|
AssertThat(names, ElementsAre("foo"))
|
|
|
|
// Make two holes in the directory.
|
|
AssertEq(nil, os.Remove(path.Join(dirName, "foo")))
|
|
AssertEq(nil, os.Remove(path.Join(dirName, "baz")))
|
|
|
|
// Add a bunch of files to the directory.
|
|
createFile("blah_0")
|
|
createFile("blah_1")
|
|
createFile("blah_2")
|
|
createFile("blah_3")
|
|
createFile("blah_4")
|
|
|
|
// Continue reading from the directory, noting the names we see.
|
|
namesSeen := make(map[string]bool)
|
|
for {
|
|
names, err = d.Readdirnames(1)
|
|
for _, n := range names {
|
|
namesSeen[n] = true
|
|
}
|
|
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
|
|
AssertEq(nil, err)
|
|
}
|
|
|
|
// Posix requires that we should have seen bar and qux, which we didn't
|
|
// delete.
|
|
ExpectTrue(namesSeen["bar"])
|
|
ExpectTrue(namesSeen["qux"])
|
|
}
|