Re: Fix in vc-ignore-dir-regexp

From: Stefan Monnier <monnier@iro.umontreal.ca>
To: rms@gnu.org
Cc: emacs-devel@gnu.org
Subject: Re: Fix in vc-ignore-dir-regexp
Date: Sat, 28 Apr 2007 10:10:45 -0400	[thread overview]
Message-ID: <jwvtzv0wpwi.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1HhXEH-0004y5-F5@fencepost.gnu.org> (Richard Stallman's message of "Fri\, 27 Apr 2007 16\:39\:45 -0400")

> Would an expert in VC please install this if it is correct?

Done.

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> From: Smith <pedzan@austin.ibm.com>
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> Date: Wed, 25 Apr 2007 18:18:52 -0500
> To: emacs-pretest-bug@gnu.org
> Subject: stat problems
> Reply-To: pedzan@austin.ibm.com

> I am running emacs 22.0.95 on AIX 5.3 (the latest levels).

> The special feature is IBM has dfs.  I guess it is normal but the dfs
> file system at IBM starts out with /.../path/to/files

> When I open a file, emacs hangs for a long time.  I put in some
> fprintf's into file-exists-p (dbx told me that is where I was
> hanging).  The output looks like this:

> stat for '/.../austin.ibm.com/fs/projects/aix/aix52Q/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/projects/aix/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/projects/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/{arch}/=tagging-method'
> stat for '/.../{arch}/=tagging-method'
> stat for '/{arch}/=tagging-method'
>  ...snip...
> stat for '/.../austin.ibm.com/fs/projects/aix/aix52Q/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/projects/aix/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/projects/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/MCVS/CVS'
> stat for '/.../austin.ibm.com/MCVS/CVS'
> stat for '/.../MCVS/CVS'
> stat for '/MCVS/CVS'

> This is for a single open.  I removed some (many) lines.

> The killer are these two stats:

> stat for '/.../MCVS/CVS'
> stat for '/.../{arch}/=tagging-method'

> With IBM's dfs set up, these each hang for quite some time (minutes).

> I discovered vc-ignore-dir-regexp

> I changed it to be this:

> ## this is from my custom-set-variables in my init.el file
> (vc-ignore-dir-regexp "\\`\\([\\/][\\/]\\|/\\.\\.\\./\\|/net/\\|/afs/\\)\\'")

> As you can see, I added /.../ into the pattern.  This seems to be
> exactly what I need.  Now the stats look like this:

> stat for '/.../austin.ibm.com/fs/projects/aix/aix53H/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/projects/aix/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/projects/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/fs/{arch}/=tagging-method'
> stat for '/.../austin.ibm.com/{arch}/=tagging-method'
>  ...snip...
> stat for '/.../austin.ibm.com/fs/projects/aix/aix53H/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/projects/aix/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/projects/MCVS/CVS'
> stat for '/.../austin.ibm.com/fs/MCVS/CVS'
> stat for '/.../austin.ibm.com/MCVS/CVS'

> I thought this might be a good general change to add in.  The pattern
> already has afs in the list.  I believe this is the dfs equivlalent.
> Although I have not been bit by it yet, I might need to add in /gsa/
> as well for the gsa file system.  It has the same pattern:

> /gsa/region/path/to/file

> So, probably stat of /gsa/CVS/ is going to hang (although from the
> command line it does not seem to).

> I hope this makes it to the list.  I don't know if I am signed up from
> this email address or not.

> Take care,
> Perry Smith

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