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git/serve: remove undocumented -n namespace option and -r /usr/git default

This makes it easier to serve local repositories where the sandboxing
gets in the way.

--- a/sys/src/cmd/git/serve.c

+++ b/sys/src/cmd/git/serve.c

@@ -5,8 +5,7 @@

 #include "git.h"

-char	*pathpfx = "/usr/git";

-char	*namespace = nil;

+char	*pathpfx = nil;

 int	allowwrite;

 int

@@ -498,7 +497,6 @@

 main(int argc, char **argv)

 {

 	char *repo, cmd[32], buf[512];

-	char *user;

 	Conn c;

 	ARGBEGIN{

@@ -510,9 +508,6 @@

 		if(*pathpfx != '/')

 			sysfatal("path prefix must begin with '/'");

 		break;

-	case 'n':

-		namespace=EARGF(usage());

-		break;

 	case 'w':

 		allowwrite++;

 		break;

@@ -522,14 +517,13 @@

 	}ARGEND;

 	gitinit();

-	user = "none";

 	interactive = 0;

-	if(allowwrite)

-		user = getuser();

-	if(newns(user, namespace) == -1)

-		sysfatal("addns: %r");

-	if(bind(pathpfx, "/", MREPL) == -1)

-		sysfatal("bind: %r");

+	if(rfork(RFNAMEG) == -1)

+		sysfatal("rfork: %r");

+	if(pathpfx != nil){

+		if(bind(pathpfx, "/", MREPL) == -1)

+			sysfatal("bind: %r");

+	}

 	if(rfork(RFNOMNT) == -1)

 		sysfatal("rfork: %r");