use "builtin cd" not "cd" to avoid messing up plumbing

Reference: /n/atom/patch/applied2013/apatchcd
Date: Mon Aug 26 19:54:53 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /rc/bin/apatch/apply	Mon Aug 26 19:54:23 2013
+++ /rc/bin/apatch/apply	Mon Aug 26 19:54:24 2013
@@ -18,8 +18,14 @@
 	}
 	$patch/applied $1
 	echo patch has been applied.  emailing...
-	@{cd $PD/applied/$1 && $patch/diffemail ; echo ------; cat $errs} |
-		mail -s 'applied patch: '^$PD/applied/$1 $M `{cat $PD/applied/email|grep -v '^-$'}
+	u=`{cat $PD/applied/$1/email|grep -v '^-$'}
+
+	# gross
+	if(~ $u quanstro@quanstro.net)
+		u=()
+
+	@{builtin cd $PD/applied/$1 && $patch/diffemail ; echo ------; cat $errs} |
+		mail -s 'applied patch: '^$PD/applied/$1 $M $u
 	rm -f $errs
 }
 
--- /rc/bin/apatch/create	Mon Aug 26 19:54:25 2013
+++ /rc/bin/apatch/create	Mon Aug 26 19:54:25 2013
@@ -183,7 +183,7 @@
 echo $patch >> /dist/apatch/applied
 echo $d locally applied.
 
-#	@{cd $PD/$1 && $patch/diffemails} |
+#	@{builtin cd $PD/$1 && $patch/diffemails} |
 #		mail -s 'new patch: '^$PD/$1 $M
 
 fn sigexit sigint
--- /rc/bin/apatch/diff	Mon Aug 26 19:54:26 2013
+++ /rc/bin/apatch/diff	Mon Aug 26 19:54:26 2013
@@ -20,7 +20,7 @@
 mountfs
 
 d=$PD/$1
-cd $d || fail no dir $d
+builtin cd $d || fail no dir $d
 
 fn mkdiff {
 	if(test -e $2.orig){
--- /rc/bin/apatch/list	Mon Aug 26 19:54:27 2013
+++ /rc/bin/apatch/list	Mon Aug 26 19:54:28 2013
@@ -3,7 +3,7 @@
 rfork e
 . /rc/bin/apatch/defs
 mountfs
-cd $PD || fail no $PD
+builtin cd $PD || fail no $PD
 
 args='dirs'
 flagfmt='a,v'
@@ -14,7 +14,8 @@
 
 dirs=$*
 if(~ $#dirs 0){
-	q = `{ls -tr | grep -v '\.[0-9]+$'}
+	q = `{ls -tr | grep -v '\.[0-9]+$
+applied'}
 	p = ()
 	for(i in $q)
 		test -d $i && p = ($p $i)
@@ -34,10 +35,8 @@
 			}
 			'
 		}
-whatis dirs
 	}
 }
-echo dirs >[1=2]
 
 for(i in $dirs){
 	if($patch/okay $i){
--- /rc/bin/apatch/notify	Mon Aug 26 19:54:28 2013
+++ /rc/bin/apatch/notify	Mon Aug 26 19:54:29 2013
@@ -4,7 +4,7 @@
 . /rc/bin/apatch/defs
 mountfs
 
-cd $PD || fail no $PD
+builtin cd $PD || fail no $PD
 for(i in [a-zA-Z]*){
 	if(! test -e $i/diffs && test -e $i/done ){
 		echo new patch $i >[1=2]
--- /rc/bin/apatch/undo	Mon Aug 26 19:54:30 2013
+++ /rc/bin/apatch/undo	Mon Aug 26 19:54:30 2013
@@ -9,7 +9,7 @@
 mountdist -w
 
 d=/n/dist/dist/$patch/$1
-must cd $d
+must builtin cd $d
 
 fn xxx {
 	if(test -e $2.backup){
--- /rc/bin/apatch/·apply	Mon Aug 26 19:54:31 2013
+++ /rc/bin/apatch/·apply	Mon Aug 26 19:54:31 2013
@@ -30,7 +30,7 @@
 	must dircp $d /n/dist/dist/patch/$1
 }
 d=/n/dist/dist/patch/$1
-must cd $d
+must builtin cd $d
 
 echo -n merge... >[1=2]
 fn xxx {