Fix in vc-ignore-dir-regexp

From: Richard Stallman <rms@gnu.org>
To: emacs-devel@gnu.org
Subject: Fix in vc-ignore-dir-regexp
Date: Fri, 27 Apr 2007 16:39:45 -0400	[thread overview]
Message-ID: <E1HhXEH-0004y5-F5@fencepost.gnu.org> (raw)

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

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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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