This is a patch for exportfs and its manpage. It fixes the issue in
exportfs, that if you specify -n (no none) or -N (other namespace)
after -a (authenticate), that these options have no effect. This was
due to the fact that -a was handled in and not after the argument
processing. In the manpage the wrong stated '-n' is corrected to be
the real '-N' and '-n' is now documented.

Notes:
Thu May 5 13:31:13 EDT 2005 rsc
    I fixed this, and also the opening of srvfd.  
    Your code looked fine except for the use of 'y' and 'n'
    as flag values -- in Plan 9 we tend to use a simple int
    with 0 or 1.
    
    I also updated the man pages to describe -B too.
    


Reference: /n/sources/patch/applied/exportfs-abugs
Date: Thu May  5 18:27:10 CES 2005
Reviewed-by: rsc

--- /sys/src/cmd/exportfs/exportfs.c	Thu May  5 18:26:34 2005
+++ /sys/src/cmd/exportfs/exportfs.c	Thu May  5 18:26:29 2005
@@ -67,7 +67,7 @@
 void
 main(int argc, char **argv)
 {
-	char buf[ERRMAX], ebuf[ERRMAX];
+	char buf[ERRMAX], ebuf[ERRMAX], isauth;
 	Fsrpc *r;
 	int n, fd;
 	char *dbfile, *srv, *file, *na, *nsfile, *keyspec;
@@ -80,24 +80,12 @@
 	na = nil;
 	nsfile = nil;
 	keyspec = "";
+	isauth = 'n';
 
 	ai = nil;
 	ARGBEGIN{
 	case 'a':
-		/*
-		 * We use p9any so we don't have to visit this code again, with the
-		 * cost that this code is incompatible with the old world, which
-		 * requires p9sk2. (The two differ in who talks first, so compatibility
-		 * is awkward.)
-		 */
-		ai = auth_proxy(0, auth_getkey, "proto=p9any role=server %s", keyspec);
-		if(ai == nil)
-			fatal("auth_proxy: %r");
-		if(nonone && strcmp(ai->cuid, "none") == 0)
-			fatal("exportfs by none disallowed");
-		if(auth_chuid(ai, nsfile) < 0)
-			fatal("auth_chuid: %r");
-		putenv("service", "exportfs");
+		isauth = 'y';
 		break;
 
 	case 'k':
@@ -172,6 +160,23 @@
 		usage();
 	}ARGEND
 	USED(argc, argv);
+
+	if(isauth == 'y'){
+		/*
+		 * We use p9any so we don't have to visit this code again, with the
+		 * cost that this code is incompatible with the old world, which
+		 * requires p9sk2. (The two differ in who talks first, so compatibility
+		 * is awkward.)
+		 */
+		ai = auth_proxy(0, auth_getkey, "proto=p9any role=server %s", keyspec);
+		if(ai == nil)
+			fatal("auth_proxy: %r");
+		if(nonone && strcmp(ai->cuid, "none") == 0)
+			fatal("exportfs by none disallowed");
+		if(auth_chuid(ai, nsfile) < 0)
+			fatal("auth_chuid: %r");
+		putenv("service", "exportfs");
+	}
 
 	if(na){
 		if(srv == nil)
--- /sys/man/4/exportfs	Thu May  5 18:26:53 2005
+++ /sys/man/4/exportfs	Thu May  5 18:26:49 2005
@@ -72,8 +72,12 @@
 by default (see
 .IR namespace (6)).
 The
-.B -n
+.B -N
 option gives an alternative name space file.
+.PP
+The
+.B -n
+option disallows the export to the user none.
 .PP
 The
 .B -R