GNU bug report logs - #62663
28.2; vc-hg-state returns incorrect results on directories in some repos

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From: Sean Whitton <spwhitton@HIDDEN>
To: Spencer Baugh <sbaugh@HIDDEN>
Subject: Re: bug#62663: 28.2; vc-hg-state returns incorrect results on
 directories in some repos
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tag 62663 - confirmed + moreinfo
thanks

Hello,

On Tue 04 Apr 2023 at 10:05am -04, Spencer Baugh wrote:

> The problem is with vc-hg-state-fast, which parses Mercurial data
> structures instead of shelling out to hg.  This is a great idea but our
> parsing seems to be wrong right now in some way.
>
> 1. Create a new hg repo with:
>
> hg init
>   --config format.use_share_safe=false
>   --config format.use-persistent-nodemap=false
>   --config format.sparse-revlog=false
>   --config format.revlog-compression=zlib
>
> (This is disabling some recent hg features which make vc-hg-state use
> the slow path.  You can verify that vc-hg-state-fast is going to run by
> checking that .hg/requirements is a subset of
> vc-hg-supported-requirements)

ITYM .hg/requires, right?  When I create a repository in this way, that
file contains share-safe, whether or not I pass those --config options.
I've hg 6.3.2 here.

> 2. touch foo && hg add foo && hg commit -m.
> 3. (vc-hg-state-slow ".")
> Returns 'up-to-date which is correct (because it shells out to hg)
> 4. (vc-hg-state ".")
> Returns 'unregistered which is wrong

This recipe doesn't work for me.  Evaluating both of these forms yields
nil.  Evaluating them with "foo" instead of "." yields up-to-date in
both cases.

Is it possible that this problem is only reproducible with newer hg?

Could you confirm your recipe still works, and let me know the version
of hg, please?

Thanks.

-- 
Sean Whitton

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Subject: Re: bug#62663: 28.2; vc-hg-state returns incorrect results on
 directories in some repos
Content-Language: en-US
To: Spencer Baugh <sbaugh@HIDDEN>, 62663 <at> debbugs.gnu.org,
 Daniel Colascione <dancol@HIDDEN>
References: <ier5yabkajk.fsf@HIDDEN>
From: Dmitry Gutov <dmitry@HIDDEN>
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Hi! Thanks for the report.

On 04/04/2023 17:05, Spencer Baugh wrote:
> The problem is with vc-hg-state-fast, which parses Mercurial data
> structures instead of shelling out to hg.  This is a great idea but our
> parsing seems to be wrong right now in some way.
> 
> 1. Create a new hg repo with:
> 
> hg init
>    --config format.use_share_safe=false
>    --config format.use-persistent-nodemap=false
>    --config format.sparse-revlog=false
>    --config format.revlog-compression=zlib
> 
> (This is disabling some recent hg features which make vc-hg-state use
> the slow path.  You can verify that vc-hg-state-fast is going to run by
> checking that .hg/requirements is a subset of
> vc-hg-supported-requirements)
> 
> 2. touch foo && hg add foo && hg commit -m.
> 3. (vc-hg-state-slow ".")
> Returns 'up-to-date which is correct (because it shells out to hg)
> 4. (vc-hg-state ".")
> Returns 'unregistered which is wrong
> 
> To a user, this manifests as various hg commands failing with errors,
> often something like
> "vc-find-backend-function: Cannot open load file: No such file or directory, vc-nil"
> 
> This also happens on Emacs 29.
> 
> (Note that this is independent of my other bug about lack of support for
> certain repo requirements.  That bug is about expanding vc-hg-state-fast
> support to new repos; this bug is showing that the already existing
> support is buggy!)

Patches are welcome, of course.

I'm going to Cc the original author of that code, but that's just for 
courtesy.

Message received at submit <at> debbugs.gnu.org:

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From: Spencer Baugh <sbaugh@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 28.2; vc-hg-state returns incorrect results on directories in some
 repos
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The problem is with vc-hg-state-fast, which parses Mercurial data
structures instead of shelling out to hg.  This is a great idea but our
parsing seems to be wrong right now in some way.

1. Create a new hg repo with:

hg init
  --config format.use_share_safe=false
  --config format.use-persistent-nodemap=false
  --config format.sparse-revlog=false
  --config format.revlog-compression=zlib

(This is disabling some recent hg features which make vc-hg-state use
the slow path.  You can verify that vc-hg-state-fast is going to run by
checking that .hg/requirements is a subset of
vc-hg-supported-requirements)

2. touch foo && hg add foo && hg commit -m.
3. (vc-hg-state-slow ".")
Returns 'up-to-date which is correct (because it shells out to hg)
4. (vc-hg-state ".")
Returns 'unregistered which is wrong

To a user, this manifests as various hg commands failing with errors,
often something like
"vc-find-backend-function: Cannot open load file: No such file or directory, vc-nil"

This also happens on Emacs 29.

(Note that this is independent of my other bug about lack of support for
certain repo requirements.  That bug is about expanding vc-hg-state-fast
support to new repos; this bug is showing that the already existing
support is buggy!)


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 of 2023-02-09 built on igm-qws-u12685a
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korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 119456 11097)
 (symbols 48 13754 1)
 (strings 32 40872 1164)
 (string-bytes 1 1248921)
 (vectors 16 18713)
 (vector-slots 8 234707 16776)
 (floats 8 86 32)
 (intervals 56 1922 0)
 (buffers 992 25)
 (heap 1024 18673 1560))