first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/src/kern/boot/bootauth.c

@@ -0,0 +1,83 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+#include <fcall.h>
+#include "../boot/boot.h"
+
+char	*authaddr;
+static void glenda(void);
+
+void
+authentication(int cpuflag)
+{
+	char *argv[16], **av;
+	int ac;
+
+	if(access(factotumPath, AEXEC) < 0 || getenv("user") != nil){
+		glenda();
+		return;
+	}
+
+	/* start agent */
+	ac = 0;
+	av = argv;
+	av[ac++] = "factotum";
+	if(getenv("debugfactotum"))
+		av[ac++] = "-p";
+//	av[ac++] = "-d";		/* debug traces */
+//	av[ac++] = "-D";		/* 9p messages */
+	if(cpuflag)
+		av[ac++] = "-S";
+	else
+		av[ac++] = "-u";
+	av[ac++] = "-sfactotum";
+	if(authaddr != nil){
+		av[ac++] = "-a";
+		av[ac++] = authaddr;
+	}
+	av[ac] = 0;
+	switch(fork()){
+	case -1:
+		fatal("starting factotum");
+	case 0:
+		exec(factotumPath, (const char**)av);
+		fatal("execing factotum");
+	default:
+		break;
+	}
+
+	/* wait for agent to really be there */
+	while(access("/mnt/factotum", 0) < 0)
+		sleep(250);
+
+	if(cpuflag)
+		return;
+}
+
+static void
+glenda(void)
+{
+	int fd;
+	char *s;
+
+	s = getenv("user");
+	if(s == nil)
+		s = "glenda";
+
+	fd = open("#c/hostowner", OWRITE);
+	if(fd >= 0){
+		if(write(fd, s, strlen(s)) != strlen(s))
+			fprint(2, "setting #c/hostowner to %s: %r\n", s);
+		close(fd);
+	}
+	fprint(2, "Set hostowner to %s\n", s);
+}