Forum: Ruby-core Dir.glob('../*') shows unexpected result in a symbolic linked directory on Windows

F1d6cc2b735bfd82c8773172da2aeab9?d=identicon&s=25 Nobuyoshi Nakada (nobu)
on 2014-04-28 08:40
(Received via mailing list)
Issue #9648 has been updated by Nobuyoshi Nakada.

Hiroshi Shirosaki wrote:
> If current directory is C:\foo\bar (linked to V:\), `READDIR` of '.' (i.e.
`FindFirstFile(".\\*", &d)`) globs linked directory (V:/), but the result 
have '..'.
> So we cannot trace parent directory.

In that case, what should it return?

1. ignores it and globs as if it were not a symlink
2. matches nothing, since there is no parent directory of a root
3. treat the parent directory same as the root directory, like unixen

> Skipping `READDIR` usage for this case solves the bug.

I'm not sure what is a "bug" yet.

> ~~~patch
> +    if (!(magical || recursive) && (FNM_SYSCASE && plain)) {

This "super-root" issue is not common to all case-insensitive systems,
but seems a DOSISH centric probably.

Bug #9648: Dir.glob('../*') shows unexpected result in a symbolic linked
directory on Windows

* Author: Hiroshi Shirosaki
* Status: Assigned
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* Category:
* Target version:
* ruby -v: ruby 2.2.0dev (2014-03-17 trunk 45356) [x64-mingw32]
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED
`Dir.glob('../*')` shows unexpected result if current directory is a
symbolic linked directory on Windows.
This issue seems to be introduced by r44802.

The following is a test case.

C:\foo>mklink /D bar V:\
symbolic link created for bar <<===>> V:\

C:\foo>cd bar

C:\foo\bar>ruby -ve "p Dir.glob('../*')"
ruby 1.9.3p392 (2013-02-22) [i386-mingw32]
["../a", "../bar"]

C:\foo\bar>\rubyinstaller\sandbox\ruby21_build\miniruby.exe -ve "p
ruby 2.2.0dev (2014-02-04 trunk 45356) [x64-mingw32]

C:\foo\bar>dir ..
 Volume in drive C is OS
 Volume Serial Number is 6629-B36B

 Directory of C:\foo

2014/03/17  18:58    <DIR>          .
2014/03/17  18:58    <DIR>          ..
2014/03/17  18:45                 6 a
2014/03/17  18:58    <SYMLINKD>     bar [V:\]
               1 File(s)              6 bytes
               3 Dir(s)  81,915,052,032 bytes free
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