Fix in vc-ignore-dir-regexp

[T. V. Raman]

I had reported a related bug many months ago about VC being too
aggressive with defaulting to the number of versioning systems
that it wants to support.

I suggest that we take out all except svn  cvs and rcs from that
list.

In particular vc systems that need to ascend the directory tree
looking for  vc directories should not appear in the default list.

>>>>> "Richard" == Richard Stallman <address@hidden> writes:
    Richard> Would an expert in VC please install this if it is
    Richard> correct?  ------- Start of forwarded message -------
    Richard> X-Spam-Status: No, score=0.5 required=5.0
    Richard> tests=DNS_FROM_RFC_ABUSE, UNPARSEABLE_RELAY
    Richard> autolearn=no version=3.1.0 From: Smith
    Richard> <address@hidden> MIME-Version: 1.0
    Richard> Content-Type: text/plain; charset=us-ascii Date:
    Richard> Wed, 25 Apr 2007 18:18:52 -0500 To:
    Richard> address@hidden Subject: stat problems
    Richard> Reply-To: address@hidden
    Richard> 
    Richard> I am running emacs 22.0.95 on AIX 5.3 (the latest
    Richard> levels).
    Richard> 
    Richard> The special feature is IBM has dfs.  I guess it is
    Richard> normal but the dfs file system at IBM starts out
    Richard> with /.../path/to/files
    Richard> 
    Richard> When I open a file, emacs hangs for a long time.  I
    Richard> put in some fprintf's into file-exists-p (dbx told
    Richard> me that is where I was hanging).  The output looks
    Richard> like this:
    Richard> 
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/aix52Q/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/{arch}/=tagging-method' stat
    Richard> for '/.../austin.ibm.com/{arch}/=tagging-method'
    Richard> stat for '/.../{arch}/=tagging-method' stat for
    Richard> '/{arch}/=tagging-method' ...snip...  stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/aix52Q/MCVS/CVS'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/MCVS/CVS' stat
    Richard> for '/.../austin.ibm.com/fs/projects/MCVS/CVS' stat
    Richard> for '/.../austin.ibm.com/fs/MCVS/CVS' stat for
    Richard> '/.../austin.ibm.com/MCVS/CVS' stat for
    Richard> '/.../MCVS/CVS' stat for '/MCVS/CVS'
    Richard> 
    Richard> This is for a single open.  I removed some (many)
    Richard> lines.
    Richard> 
    Richard> The killer are these two stats:
    Richard> 
    Richard> stat for '/.../MCVS/CVS' stat for
    Richard> '/.../{arch}/=tagging-method'
    Richard> 
    Richard> With IBM's dfs set up, these each hang for quite
    Richard> some time (minutes).
    Richard> 
    Richard> I discovered vc-ignore-dir-regexp
    Richard> 
    Richard> I changed it to be this:
    Richard> 
    Richard> ## this is from my custom-set-variables in my
    Richard> init.el file (vc-ignore-dir-regexp
    Richard> "\\`\\([\\/][\\/]\\|/\\.\\.\\./\\|/net/\\|/afs/\\)\\'")
    Richard> 
    Richard> As you can see, I added /.../ into the pattern.
    Richard> This seems to be exactly what I need.  Now the stats
    Richard> look like this:
    Richard> 
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/aix53H/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/{arch}/=tagging-method'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/{arch}/=tagging-method' stat
    Richard> for '/.../austin.ibm.com/{arch}/=tagging-method'
    Richard> ...snip...  stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/aix53H/MCVS/CVS'
    Richard> stat for
    Richard> '/.../austin.ibm.com/fs/projects/aix/MCVS/CVS' stat
    Richard> for '/.../austin.ibm.com/fs/projects/MCVS/CVS' stat
    Richard> for '/.../austin.ibm.com/fs/MCVS/CVS' stat for
    Richard> '/.../austin.ibm.com/MCVS/CVS'
    Richard> 
    Richard> I thought this might be a good general change to add
    Richard> in.  The pattern already has afs in the list.  I
    Richard> believe this is the dfs equivlalent.  Although I
    Richard> have not been bit by it yet, I might need to add in
    Richard> /gsa/ as well for the gsa file system.  It has the
    Richard> same pattern:
    Richard> 
    Richard> /gsa/region/path/to/file
    Richard> 
    Richard> So, probably stat of /gsa/CVS/ is going to hang
    Richard> (although from the command line it does not seem
    Richard> to).
    Richard> 
    Richard> I hope this makes it to the list.  I don't know if I
    Richard> am signed up from this email address or not.
    Richard> 
    Richard> Take care, Perry Smith
    Richard> 
    Richard> 
    Richard> _______________________________________________
    Richard> emacs-pretest-bug mailing list
    Richard> address@hidden
    Richard> http://lists.gnu.org/mailman/listinfo/emacs-pretest-bug
    Richard> ------- End of forwarded message -------
    Richard> 
    Richard> 
    Richard> _______________________________________________
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    Richard> http://lists.gnu.org/mailman/listinfo/emacs-devel

-- 
Best Regards,
--raman

      
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