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936084890a
The existing implementation of NameSpace implicitly assumes that a
FileSystem with a directory at the top will be mounted at the root
mount point "/" of the NameSpace. If this is not the case, then
Stat("/") will fail even if ReadDir("/") succeedes. This is unexpected
behavior which breaks directory traversal routines (eg. http.FileServer).
This CL adds an unexported implementation of FileSystem called emptyVFS
that emulates an empty directory and adds a NewNameSpace() function that
binds emptyVFS to "/" so that unexpected behavior does not arise even if
the use does not mount anything explicitly at "/".
Latest patch set causes the FileInfo of the empty top level emulated
directory to return "/" for Name() and Zero Time for ModTime() and
removes the related struct state fields being used in the previous
implementation.
Fixes golang/go#14190
Change-Id: Idce2fc3c9b81206847a33840d76b660059d53d18
Reviewed-on: https://go-review.googlesource.com/19445
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package vfs_test
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import (
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"golang.org/x/tools/godoc/vfs"
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"golang.org/x/tools/godoc/vfs/mapfs"
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"testing"
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"time"
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)
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func TestNewNameSpace(t *testing.T) {
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// We will mount this filesystem under /fs1
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mount := mapfs.New(map[string]string{"fs1file": "abcdefgh"})
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// Existing process. This should give error on Stat("/")
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t1 := vfs.NameSpace{}
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t1.Bind("/fs1", mount, "/", vfs.BindReplace)
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// using NewNameSpace. This should work fine.
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t2 := vfs.NewNameSpace()
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t2.Bind("/fs1", mount, "/", vfs.BindReplace)
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testcases := map[string][]bool{
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"/": []bool{false, true},
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"/fs1": []bool{true, true},
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"/fs1/fs1file": []bool{true, true},
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}
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fss := []vfs.FileSystem{t1, t2}
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for j, fs := range fss {
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for k, v := range testcases {
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_, err := fs.Stat(k)
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result := err == nil
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if result != v[j] {
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t.Errorf("fs: %d, testcase: %s, want: %v, got: %v, err: %s", j, k, v[j], result, err)
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}
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}
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}
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fi, err := t2.Stat("/")
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if err != nil {
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t.Fatal(err)
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}
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if fi.Name() != "/" {
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t.Errorf("t2.Name() : want:%s got:%s", "/", fi.Name())
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}
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if !fi.ModTime().IsZero() {
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t.Errorf("t2.Modime() : want:%v got:%v", time.Time{}, fi.ModTime())
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}
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}
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