GNU bug report logs - #28245
26.0.50; symbolic links not well handled by vc-dir

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: vincent.belaiche <at> gmail.com (Vincent Belaïche)
To: bug-gnu-emacs <at> gnu.org
Cc: Vincent Belaïche <vincent.belaiche <at> gmail.com>
Subject: 26.0.50; symbolic links not well handled by vc-dir
Date: Sat, 26 Aug 2017 23:02:55 +0200

Hello, I have a project under SVN version control. Under the directory
under change control I have a test directory, call it `trunk/test', in
which a symbolic link is created to another file, call it
`trunk/scr/foo', for the purpose of test. So the symbolic link is
`trunk/foo' pointing at `trunk/src/foo'. `trunk/foo' is not under change
control, it is created by the test makefile, while `trunk/src/foo' is
under change control.

Please note that I am under MSW, I have created the symbolic links as
native NTFS symbolic links thanks to MSYS2 ln command --- by default
this command makes a copy, but it is possible to configure MSYS2 to have
native symlinks.

OK, `trunk/src/foo' is edited, and when I do `M-x vc-dir', I see in the
list of edited files `trunk/src/foo' twice. That is, IMHO, a bug.

BR,
	Vincent.




In GNU Emacs 26.0.50 (build 1, i686-pc-mingw32)
 of 2017-07-02 built on AIGLEROYAL
Repository revision: 3bab927884c4b795f8545b632328b5d3b632eed3
Windowing system distributor 'Microsoft Corp.', version 10.0.14393
Recent messages:
Parsing c:/Users/Vincent/AppData/Roaming/.mailrc... done
Mark set
Auto-saving...done
Making completion list...
Mark set
Making completion list...
You can run the command ‘vc-dir’ with C-x v d
Mark set
funcall-interactively: Buffer is read-only: #<buffer *vc-dir*<dssmith>>
Making completion list...

Configured using:
 'configure --prefix=c:/Nos_Programmes/GNU/Emacs --without-jpeg
 --without-tiff --without-gif --without-png 'CFLAGS= -Og -g3 -L
 C:/Programmes/installation/emacs-install/libXpm-3.5.8/src' 'CPPFLAGS=
 -DFOR_MSW=1 -I
 C:/Programmes/installation/emacs-install/libXpm-3.5.8/include -I
 C:/Programmes/installation/emacs-install/libXpm-3.5.8/src -L
 C:/Programmes/installation/emacs-install/libXpm-3.5.8/src'
 PKG_CONFIG=/mingw/bin/pkg-config.exe PKG_CONFIG_PATH=/mingw/bin'

Configured features:
XPM SOUND NOTIFY ACL GNUTLS TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: FRA
  locale-coding-system: cp1252

Major mode: VC dir

Minor modes in effect:
  TeX-PDF-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  recentf-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
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  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
c:/Programmes/installation/cedet-install/cedet-git/lisp/speedbar/loaddefs hides c:/Nos_Programmes/GNU/Emacs/share/emacs/26.0.50/lisp/loaddefs
c:/Programmes/installation/cedet-install/cedet-git/lisp/speedbar/loaddefs hides c:/Programmes/installation/cedet-install/cedet-git/lisp/cedet/loaddefs

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Memory information:
((conses 8 1400083 260824)
 (symbols 32 62370 1)
 (miscs 32 3383 5686)
 (strings 16 212563 28349)
 (string-bytes 1 6997868)
 (vectors 8 77650)
 (vector-slots 4 2079364 66492)
 (floats 8 976 1177)
 (intervals 28 113737 2616)
 (buffers 516 244))

---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus

Message #8 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: vincent.belaiche <at> gmail.com (Vincent Belaïche)
Cc: 28245 <at> debbugs.gnu.org
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Sun, 27 Aug 2017 17:21:42 +0300

> From: vincent.belaiche <at> gmail.com (Vincent Belaïche)
> Date: Sat, 26 Aug 2017 23:02:55 +0200
> Cc: Vincent Belaïche <vincent.belaiche <at> gmail.com>
> 
> Hello, I have a project under SVN version control. Under the directory
> under change control I have a test directory, call it `trunk/test', in
> which a symbolic link is created to another file, call it
> `trunk/scr/foo', for the purpose of test. So the symbolic link is
> `trunk/foo' pointing at `trunk/src/foo'. `trunk/foo' is not under change
> control, it is created by the test makefile, while `trunk/src/foo' is
> under change control.
> 
> Please note that I am under MSW, I have created the symbolic links as
> native NTFS symbolic links thanks to MSYS2 ln command --- by default
> this command makes a copy, but it is possible to configure MSYS2 to have
> native symlinks.
> 
> OK, `trunk/src/foo' is edited, and when I do `M-x vc-dir', I see in the
> list of edited files `trunk/src/foo' twice. That is, IMHO, a bug.

vc-dir calls the SVN backend to collect its information, and according
to my references, SVN doesn't support symlinks on MS-Windows.  Does
your port of SVN support symlinks?  What does "svn status -v" show in
that repository?

Message #11 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: vincent.belaiche <at> gmail.com (Vincent Belaïche)
To: 28245 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Cc: Vincent Belaïche <vincent.belaiche <at> gmail.com>
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Sun, 27 Aug 2017 22:52:53 +0200

My answers bellow...

Le 27/08/2017 à 16:21, Eli Zaretskii a écrit :
>> From: vincent.belaiche <at> gmail.com (Vincent Belaïche)
>> Date: Sat, 26 Aug 2017 23:02:55 +0200
>> Cc: Vincent Belaïche <vincent.belaiche <at> gmail.com>
>>
>> Hello, I have a project under SVN version control. Under the directory
>> under change control I have a test directory, call it `trunk/test', in
>> which a symbolic link is created to another file, call it
>> `trunk/scr/foo', for the purpose of test. So the symbolic link is
>> `trunk/foo' pointing at `trunk/src/foo'. `trunk/foo' is not under change
>> control, it is created by the test makefile, while `trunk/src/foo' is
>> under change control.
>>
>> Please note that I am under MSW, I have created the symbolic links as
>> native NTFS symbolic links thanks to MSYS2 ln command --- by default
>> this command makes a copy, but it is possible to configure MSYS2 to have
>> native symlinks.
>>
>> OK, `trunk/src/foo' is edited, and when I do `M-x vc-dir', I see in the
>> list of edited files `trunk/src/foo' twice. That is, IMHO, a bug.
>
> vc-dir calls the SVN backend to collect its information, and according
> to my references, SVN doesn't support symlinks on MS-Windows.

You are correct, SVN doesn't support symlinks on MS-Windows. So, it
might well be that nothing is to be done on the Emacs side. But please
read the following...

> Does your port of SVN support symlinks?

FYI, my port is the collabnet one.

--8<----8<----8<----8<----8<-- begin -->8---->8---->8---->8---->8----
$ svn --version
svn, version 1.8.13 (r1667537)
   compiled Mar 23 2015, 03:35:53 on x86_64/x86-microsoft-windows5.1.2600

Copyright (C) 2014 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

The following repository access (RA) modules are available:

* ra_svn : Module for accessing a repository using the svn network protocol.
  - with Cyrus SASL authentication
  - handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
  - using serf 1.3.8
  - handles 'http' scheme
  - handles 'https' scheme
--8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----

It does not support symlinks to the extent that if there is a symlink in
the repo, then the symlink is not created by a chekcout in the work
area. Instead a plain file containing the link information is
created. However, if I create manually the symlink in place of this
file, then subsequent svn update won't overwrite it.

Now, here, we are not talking about a symlink in the repo, this is a
symlink created locally and which is not under version control.

> What does "svn status -v" show in that repository?

When I do that, I see the original file `foo' only once. Please note
that my bug report is erroneous. Actually, the symlink is
trunk/test/foo, pointing as trunk/src/foo. trunk/src/foo is under change
control, but the directory trunk/test and all its content is not under
change control --- I have not yet imported it. So `svn status -v' done
under trunk shows only, as far as trunk/test and its content are
concerned, this:

--8<----8<----8<----8<----8<-- begin -->8---->8---->8---->8---->8----
?                                        test
--8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----

My intention was to import trunk/test to the repo with only the files
under trunk/test that aren't created by the test, so the symlinks would
in the end not be under change control, which anyway is impossible
because my SVN client does not support symlinks.

  Vincent.

---
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Message #14 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Richard Stallman <rms <at> gnu.org>
To: vincent.belaiche <at> gmail.com (Vincent Belaïche)
Cc: 28245 <at> debbugs.gnu.org, vincent.belaiche <at> gmail.com
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Sun, 27 Aug 2017 21:04:03 -0400

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

Emacs developers will work on fixing this specific problem,
but the larger underlying problem is one that only you can fix:

  > Please note that I am under MSW,

Windows does you constant injustice because it is nonfree software.
See https://gnu.org/philosophy/free-software-even-more-important.html.

It is also malware: see https://gnu.org/malware/malware-microsoft.html.

Please do not interpret our support for running GNU Emacs on Windows
as granting Windows legitimacy.  For your freedom's sake, you need to
get out from under it!

-- 
Dr Richard Stallman
President, Free Software Foundation (gnu.org, fsf.org)
Internet Hall-of-Famer (internethalloffame.org)
Skype: No way! See stallman.org/skype.html.

Message #17 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: vincent.belaiche <at> gmail.com (Vincent Belaïche)
Cc: 28245 <at> debbugs.gnu.org
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Mon, 28 Aug 2017 20:44:01 +0300

> From: vincent.belaiche <at> gmail.com (Vincent Belaïche)
> Cc: Vincent Belaïche <vincent.belaiche <at> gmail.com> 
> Date: Sun, 27 Aug 2017 22:52:53 +0200
> 
> > What does "svn status -v" show in that repository?
> 
> When I do that, I see the original file `foo' only once. Please note
> that my bug report is erroneous. Actually, the symlink is
> trunk/test/foo, pointing as trunk/src/foo. trunk/src/foo is under change
> control, but the directory trunk/test and all its content is not under
> change control --- I have not yet imported it. So `svn status -v' done
> under trunk shows only, as far as trunk/test and its content are
> concerned, this:
> 
> --8<----8<----8<----8<----8<-- begin -->8---->8---->8---->8---->8----
> ?                                        test
> --8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----

Then maybe "svn status -v" is not the right (or not the only) command
you should try.  My point is that you should find out which SVN
commands are invoked by vc-dir in this use case, and then see what did
SVN produce for these commands outside of Emacs.

It also could be that this is not a Windows-specific issue.

Message #20 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28245 <at> debbugs.gnu.org,
 Vincent Belaïche <vincent.belaiche <at> gmail.com>
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Mon, 28 Aug 2017 14:13:35 -0400

Eli Zaretskii wrote:

> It also could be that this is not a Windows-specific issue.

I find the report unclear, but on GNU/Linux:

cd /tmp
mkdir svn
cd svn
svnadmin create repo
mkdir -p trunk/src
touch trunk/src/foo
svn import trunk file://$PWD/repo/trunk -m "Import"
rm -rf trunk
svn checkout file://$PWD/repo/trunk
echo blah >> trunk/src/foo
mkdir trunk/test
cd trunk/test
ln -s ../src/foo
cd ../
emacs -Q -f vc-dir RET

and everything looks correct to me.

Message #23 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 28245 <at> debbugs.gnu.org, vincent.belaiche <at> gmail.com
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Mon, 28 Aug 2017 21:19:42 +0300

> From: Glenn Morris <rgm <at> gnu.org>
> Cc: vincent.belaiche <at> gmail.com (Vincent Belaïche),
>   28245 <at> debbugs.gnu.org
> Date: Mon, 28 Aug 2017 14:13:35 -0400
> 
> emacs -Q -f vc-dir RET
> 
> and everything looks correct to me.

One problem with this bug report, at least from my POV, is that
neither Vincent nor you actually _show_ what you see in vc-dir.  So
it's hard for me to even reason what is and isn't "correct".

(And I think your directory structure is not what Vincent described,
although I can understand how you could be confused, since he made a
couple of mistakes describing it.)

Thanks.

Message #26 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28245 <at> debbugs.gnu.org, vincent.belaiche <at> gmail.com
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Mon, 28 Aug 2017 14:33:50 -0400

Eli Zaretskii wrote:

> One problem with this bug report, at least from my POV, is that
> neither Vincent nor you actually _show_ what you see in vc-dir.  So
> it's hard for me to even reason what is and isn't "correct".

I gave a recipe you could follow on eg fencepost, and see for yourself.
Here it looks like:

VC backend : SVN
Working dir: /tmp/svn/trunk/
Repository : file:///tmp/svn/repo

                         ./
    unregistered         test
                         src/
    edited               src/foo


IMO it will be unproductive to debug this further without a similar
recipe from Vincent.

Message #29 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 28245 <at> debbugs.gnu.org, vincent.belaiche <at> gmail.com
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Mon, 28 Aug 2017 21:38:55 +0300

> From: Glenn Morris <rgm <at> gnu.org>
> Cc: vincent.belaiche <at> gmail.com,  28245 <at> debbugs.gnu.org
> Date: Mon, 28 Aug 2017 14:33:50 -0400
> 
> VC backend : SVN
> Working dir: /tmp/svn/trunk/
> Repository : file:///tmp/svn/repo
> 
>                          ./
>     unregistered         test
>                          src/
>     edited               src/foo

Thanks.

> IMO it will be unproductive to debug this further without a similar
> recipe from Vincent.

Indeed.

Message #32 received at 28245 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Belaïche <vincent.belaiche <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>, Glenn Morris <rgm <at> gnu.org>
Cc: 28245 <at> debbugs.gnu.org
Subject: Re: bug#28245: 26.0.50; symbolic links not well handled by vc-dir
Date: Tue, 29 Aug 2017 00:57:20 +0200

Le 28/08/2017 à 20:38, Eli Zaretskii a écrit :
>> From: Glenn Morris <rgm <at> gnu.org>
>> Cc: vincent.belaiche <at> gmail.com,  28245 <at> debbugs.gnu.org
>> Date: Mon, 28 Aug 2017 14:33:50 -0400
>>
>> VC backend : SVN
>> Working dir: /tmp/svn/trunk/
>> Repository : file:///tmp/svn/repo
>>
>>                           ./
>>      unregistered         test
>>                           src/
>>      edited               src/foo
> Thanks.
>
>> IMO it will be unproductive to debug this further without a similar
>> recipe from Vincent.
> Indeed.
I need to prepare a minimal example to reproduce the problem which I saw.
That might be not so easy, as I cannot reproduce it any longer on the 
work area in which I observed it.
So, please be patients gentlemen.

  Vincent.

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