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Re: CVS Keyword expansion patch


From: Mark D. Baushke
Subject: Re: CVS Keyword expansion patch
Date: Wed, 12 Mar 2003 07:12:30 -0800

Hi Scott,

I was not aware that the filename My::results.txt was generally illegal.
It seems to work fine on my GNU/Linux and FreeBSD machines. Perhaps
there are systems where this is not true? What operating system are you
using?

Consider this case:
  
  mkdir -p /tmp/cvs-sanity/header
  cd /tmp/cvs-sanity/header
  cvs -d /tmp/cvs-sanity/cvsroot init
  echo '$'Header'$' > My::results.txt
  cvs -d /tmp/cvs-sanity/cvsroot -Q import -m newimport header vendor ver1
  cvs -d /tmp/cvs-sanity/cvsroot -Q checkout header
  cd header
  cat My::results.txt
  echo more data >> My::results.txt
  cvs -Q commit -m newtext
  cat My::results.txt

which produces the results:

$Header: /tmp/cvs-sanity/cvsroot/header/My::results.txt,v 1.1.1.1 2003/03/12 
15:03:09 mdb Exp $
Checking in My::results.txt;
/tmp/cvs-sanity/cvsroot/header/My::results.txt,v  <--  My::results.txt
new revision: 1.2; previous revision: 1.1
done
$Header: /tmp/cvs-sanity/cvsroot/header/My::results.txt,v 1.2 2003/03/12 
15:06:16 mdb Exp $
more data

Would your patch allow the above expected results?

If not, then that would seem to be a problem that the rcs keyword
expansion does not always work as expected based on the name of the
file...

        Thanks,
        -- Mark

Scott James Remnant <address@hidden> writes:

> A simple patch for you to consider,
> 
> It's possible to trip over Keyword expansion when using Perl because
> code like " $Header::fields{$value} " ends up being quite a common
> occurrence.
> 
> CVS would see the "$Header:.....$" in the above and you end up with
> bogus code.  Simply setting -kb isn't the right thing, because you
> generally DO want keyword expansion in the comments at the top, amongst
> other places.
> 
> I therefore submit this patch, basically it prevents keyword expansion
> if the keyword ends in "::"
> 
> ----8<--------8<--------8<--------8<--------8<--------8<--------8<----
> diff -urN cvs-1.11.5.orig/src/rcs.c cvs-1.11.5/src/rcs.c
> --- cvs-1.11.5.orig/src/rcs.c Thu Jan 16 15:10:55 2003
> +++ cvs-1.11.5/src/rcs.c      Wed Mar 12 11:39:08 2003
> @@ -3689,6 +3689,11 @@
>             keyword after all.  */
>       if (*s == ':')
>       {
> +         /* If the keyword ends with '::', then this wasn't a keyword
> +            after all, but a Perl variable!  */
> +         if (*(s + 1) == ':')
> +             continue;
> +
>           for (; s < send; s++)
>               if (*s == '$' || *s == '\n')
>                   break;
> ---->8-------->8-------->8-------->8-------->8-------->8-------->8----
> 
> Scott
> -- 
> sjr  software and systems engineer
>      demon internet, thus plc
> 
> 
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> Bug-cvs mailing list
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