When installing on a machine which doesn't have a VGA card installed, enable

a getty on the serial port so that it's possible to login when the system is
rebooted.

PR: bin/23098
Submitted by: Doug Ambrisko <ambrisko at whistle.com>
Reviewed by: randi
Approved by: rrs (mentor)
MFC after: 1 month

usr.sbin/sysinstall/install.c

@@ -877,6 +877,9 @@ installConfigure(void)
 int
 installFixupBase(dialogMenuItem *self)
 {
+	FILE *orig, *new;
+	char buf[1024];
+	char *pos;
 #if defined(__i386__) || defined(__amd64__)
     FILE *fp;
 #endif
@@ -895,6 +898,32 @@ installFixupBase(dialogMenuItem *self)
 	    fclose(fp);
 	}
 #endif
+
+	/* Fixup /etc/ttys to start a getty on the serial port.
+	  This way after a serial installation you can login via
+	  the serial port */
+
+	if (!OnVTY){
+	    if (((orig=fopen("/etc/ttys","r")) != NULL) &&
+		((new=fopen("/etc/ttys.tmp","w")) != NULL)) {
+		while (fgets(buf,sizeof(buf),orig)){
+		    if (strstr(buf,"ttyu0")){
+			if ((pos=strstr(buf,"off"))){
+			    *pos++='o';
+			    *pos++='n';
+			    *pos++=' ';
+			}
+		    }
+		    fputs(buf,new);
+		}
+		fclose(orig);
+		fclose(new);
+
+		rename("/etc/ttys.tmp","/etc/ttys");
+		unlink("/etc/ttys.tmp");
+	    }
+	}
+
 	
 	/* BOGON #2: We leave /etc in a bad state */
 	chmod("/etc", 0755);