GNU bug report logs - #1741
23.0.60; vc fail to register file while logged as /su:: with tramp

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Message #38 received at 1741 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Dan Nicolaescu <dann <at> ics.uci.edu>, 1741 <at> debbugs.gnu.org
Subject: Re: bug#1741: 23.0.60; vc fail to register file while logged as /su:: with tramp
Date: Thu, 09 Apr 2009 17:06:00 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>>>> If I create a new file: "/su:root <at> localhost:/tmp/blah"
>>>> then to C-x v v to register it, it fails.  But I can see that the 
>>>> /tmp/RCS/blah,v is created.  If after that I do:
>>> 
>>>> M-: (file-exists-p "/su:root <at> localhost:/tmp/RCS/blah,v") RET
>>>> the result is nil.
>>> 
>>>> If I start a new emacs and do:
>>>> M-: (file-exists-p "/su:root <at> localhost:/tmp/RCS/blah,v") RET
>>>> the result is t.
>>> 
>>> Hmm... looks like a stale cache.
>>> Michael?
>
>> Yes, a stale cache. I've committed a patch, which adds a file name
>> handler for `vc-registered'. There the cache is disabled temporarily.
>> Works for me. Could you guys, please, check?
>
> I'd rather find a more generic fix.  E.g. can't you flush the cache when
> handling process-file?

That would be too invasive, I believe. The whole cache would be flushed,
even all data which are not related too.

And there might be the case, that a file is registered in RCS (or
whatever backend is used) outside Emacs. Tramp would still have stale
cache data for "/su:root <at> localhost:/tmp/RCS/blah,v" then.

>         Stefan

Best regards, Michael.

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