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path/filepath: windows: EvalSymlinks produces incorrect results when called with "." inside a symlink #12451

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alexsaveliev opened this issue Sep 2, 2015 · 1 comment
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path/filepath: windows: EvalSymlinks produces incorrect results when called with "." inside a symlink #12451

alexsaveliev opened this issue Sep 2, 2015 · 1 comment
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FrozenDueToAge OS-Windows
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Go1.6

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@alexsaveliev
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reproducible with

go version go1.4.2 windows/amd64
go version go1.5 windows/amd64

OS

Windows 7 Home Premium x64

How to repeat

  • create directory and two symlinks to it, one is relative and one points to absolute path
C:\>mkdir c:\a
C:\>mklink  /D b a
symbolic link created for b <<===>> a
C:\>mklink  /D c C:\a
symbolic link created for c <<===>> C:\a
  • In each of a, b, c run the following code
package main

import (
    "os"
    "path/filepath"
    "fmt"
)

func main() {

    source := os.Args[1]
    target, err := filepath.EvalSymlinks(source)
    fmt.Println(target, err)
}

passing . as argument

Expected result:

C:\a>go run D:\test\checklink.go .
. <nil>

C:\b>go run D:\test\checklink.go .
. <nil>

C:\c>go run D:\test\checklink.go .
. <nil>

Actual result:

C:\a>go run D:\test\checklink.go .
. <nil>

C:\b>go run D:\test\checklink.go .
go build command-line-arguments: C:\Go\pkg\tool\windows_amd64\6l.exe: chdir a: The system cannot find the file specified.

C:\c>go run D:\test\checklink.go .
 EvalSymlinks: too many links in .
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Sep 2, 2015
@ianlancetaylor ianlancetaylor changed the title windows: path/filepath.EvalSymlinks produces incorrect results when called with "." inside a symlink path/filepath: windows: EvalSymlinks produces incorrect results when called with "." inside a symlink Sep 2, 2015
@gopherbot
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CL https://golang.org/cl/16192 mentions this issue.

@golang golang locked and limited conversation to collaborators Nov 4, 2016
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@ianlancetaylor @alexsaveliev @gopherbot