mount, srv: add -N flag to skip authentication and attach anonymously as "none"

sys/man/1/bind

@@ -144,7 +144,7 @@ operation fails.
 .PD
 .PP
 .I Mount
-takes two additional options.
+takes three additional options.
 The first,
 .B -k
 .IR keypattern ,
@@ -156,6 +156,11 @@ The second,
 causes
 .I mount
 to skip authentication entirely.
+The third,
+.BR -N ,
+skips authentication and specifies
+.B none
+as the username to the fileserver.
 .PP
 The
 .I spec

sys/man/4/srv

@@ -4,7 +4,7 @@ srv, srvold9p, 9fs, srvssh \- start network file service
 .SH SYNOPSIS
 .B srv
 [
-.B -abcCemnq
+.B -abcCemnNq
 ] [
 .B -s
 .I seconds
@@ -114,7 +114,8 @@ The
 .BR c ,
 .BR C ,
 and
-.B n
+.BR n ,
+.B N
 options are used to control the mount flags as in
 .I mount
 (see

sys/src/cmd/mount.c

@@ -6,6 +6,11 @@ void	usage(void);
 void	catch(void*, char*);
 
 char *keyspec = "";
+char *spec = "";
+int flag = MREPL;
+int qflag = 0;
+int noauth = 0;
+int asnone = 0;
 
 int
 amount0(int fd, char *mntpt, int flags, char *aname, char *keyspec)
@@ -30,10 +35,6 @@ amount0(int fd, char *mntpt, int flags, char *aname, char *keyspec)
 void
 main(int argc, char *argv[])
 {
-	char *spec;
-	ulong flag = 0;
-	int qflag = 0;
-	int noauth = 0;
 	int fd, rv;
 
 	ARGBEGIN{
@@ -52,6 +53,9 @@ main(int argc, char *argv[])
 	case 'k':
 		keyspec = EARGF(usage());
 		break;
+	case 'N':
+		asnone = 1;
+		/* no break */
 	case 'n':
 		noauth = 1;
 		break;
@@ -62,12 +66,9 @@ main(int argc, char *argv[])
 		usage();
 	}ARGEND
 
-	spec = 0;
+	if(argc == 3)
-	if(argc == 2)
-		spec = "";
-	else if(argc == 3)
 		spec = argv[2];
-	else
+	else if(argc != 2)
 		usage();
 
 	if((flag&MAFTER)&&(flag&MBEFORE))
@@ -81,6 +82,16 @@ main(int argc, char *argv[])
 		exits("open");
 	}
 
+	if(asnone){
+		rv = open("#c/user", OWRITE);
+		if(rv < 0 || write(rv, "none", 4) != 4){
+			if(qflag)
+				exits(0);
+			fprint(2, "%s: can't become none: %r\n", argv0);
+			exits("becomenone");
+		}
+	}
+
 	notify(catch);
 	if(noauth)
 		rv = mount(fd, -1, argv[1], flag, spec);
@@ -96,16 +107,15 @@ main(int argc, char *argv[])
 }
 
 void
-catch(void *x, char *m)
+catch(void *, char *m)
 {
-	USED(x);
+	fprint(2, "%s: %s\n", argv0, m);
-	fprint(2, "mount: %s\n", m);
 	exits(m);
 }
 
 void
 usage(void)
 {
-	fprint(2, "usage: mount [-a|-b] [-cnq] [-k keypattern] /srv/service dir [spec]\n");
+	fprint(2, "usage: mount [-a|-b] [-cCnNq] [-k keypattern] /srv/service dir [spec]\n");
 	exits("usage");
 }

sys/src/cmd/srv.c

@@ -10,12 +10,13 @@ void	rpc(int, int);
 void	post(char*, int);
 void	mountfs(char*, int);
 int	doauth = 1;
+int	asnone = 0;
 
 void
 usage(void)
 {
-	fprint(2, "usage: %s [-abcCm] [net!]host [srvname [mtpt]]\n", argv0);
+	fprint(2, "usage: %s [-abcCmnNq] [net!]host [srvname [mtpt]]\n", argv0);
-	fprint(2, "    or %s -e [-abcCm] command [srvname [mtpt]]\n", argv0);
+	fprint(2, "    or %s -e [-abcCmnNq] command [srvname [mtpt]]\n", argv0);
 
 	exits("usage");
 }
@@ -106,6 +107,9 @@ main(int argc, char *argv[])
 		domount = 1;
 		reallymount = 1;
 		break;
+	case 'N':
+		asnone = 1;
+		/* no break */
 	case 'n':
 		doauth = 0;
 		break;
@@ -197,6 +201,15 @@ Mount:
 	if(domount == 0 || reallymount == 0)
 		exits(0);
 
+	if(asnone){
+		try = open("#c/user", OWRITE);
+		if(try < 0 || write(try, "none", 4) != 4){
+			fprint(2, "srv %s: can't become none: %r\n", dest);
+			exits("becomenone");
+		}
+		try = 0;
+	}
+
 	if((!doauth && mount(fd, -1, mtpt, mountflag, "") < 0)
 	|| (doauth && amount(fd, mtpt, mountflag, "") < 0)){
 		err[0] = 0;