Adding this case to 9fs allows users to store vac scores
(as in vac's -f) in /lib/scores or $home/lib/scores and
run '9fs whatever.vac' to mount them using vacfs. I've
been using this for a few months to get at backups of
various unix systems, and it's a very nice, comfortable,
simple addition that I think is general enough to
warrant inclusion in the default 9fs.

Notes:
Wed Jan 20 16:13:40 EST 2010 geoff
    done a little differently to mesh with our existing 9fs.


Reference: /n/sources/patch/applied/9fs-vac-scores
Date: Wed Jun  3 22:16:41 CES 2009
Signed-off-by: a@9srv.net
Reviewed-by: geoff

--- /rc/bin/9fs	Wed Jun  3 22:06:17 2009
+++ /rc/bin/9fs	Wed Jun  3 22:06:15 2009
@@ -29,6 +29,14 @@
 	mount -n /srv/sources /n/sourcessnap main/snapshot
 case wiki
 	srv -m 'net!plan9.bell-labs.com!wiki' wiki /mnt/wiki
+# Lookup archives in ($home)/lib/scores
+case *.vac
+	if(test -e $home/lib/scores/$1)
+		vacfs -S $1 $home/lib/scores/$1 && mount /srv/$1 /n/$1
+	if not if(test -e /lib/scores/$1) {
+		vacfs -S $1 /lib/scores/$1 && mount /srv/$1 /n/$1
+	}
+	if not echo 'Don''t know how to mount' $1
 case *
 	switch($#*){
 	case 1