Re: Changes to the filesystem while find is running - comments?

[Tim Nelson]

On Thu, 25 Nov 2004, James Youngman wrote:

> On Thu, Nov 25, 2004 at 09:45:25AM +1100, Tim Nelson wrote:
>
> >         Ok, so the sequence in find is currently (in pseudo-perl):
> > -----------
> > $old = stat $dir;
> > chdir $dir;
> > $new = stat $dir;
> > wd_sanity_check($old, $new);
> > -----------
>
> No, we lstat(".") rather than $dir.
>
> >         If your information is correct, then what we need to do is
> > something like:
> > -----------
> > $tmp = $dir . '.';
> > $old = stat $tmp;
> > chdir $dir;
> > $new = stat $tmp;
> > wd_sanity_check($old, $new);
> > -----------
> >
> >         Would that do it, or am I missing something?
>
> What we need to do - and what we do do - is this -
>
> $tmp = <base name of subdirectory>;

	According to the description by Steve Revilak which was sent 
through, if you at this point do:

$tmp = $tmp + '.';

	...then that will fix the problem.  So instead of statting eg. 
"/usr/local/bin", you'll be statting "/usr/local/bin/." (note the dot in 
the second one).

> $old = lstat $tmp;   /* line A */
> chdir $dir;          /* line B */
> $new = lstat ".";    /* line C */
> wd_sanity_check($old, $new);
>
>
> >         Assuming that accessing /mount/SUBDIR/. also triggers a mount on
> > the other OSs, the example above should work on everything.  If it
> > doesn't, we might have to do two stats the first time, one on $dir and
> > then one on $tmp.
>
> On Solaris, the filesystem gets mounted at either line B or C (I'm not
> sure which).  Hence wd_sanity_check() needed to be changed to
> understand why $old differs from $new in this case.

        Point C, according to Steve Revilak.

        :)

--
Tim Nelson
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