[login] Add "login" command and UI

src/hci/commands/login_cmd.c

@@ -0,0 +1,27 @@
+#include <string.h>
+#include <stdio.h>
+#include <gpxe/command.h>
+#include <gpxe/login_ui.h>
+
+static int login_exec ( int argc, char **argv ) {
+	int rc;
+
+	if ( argc > 1 ) {
+		printf ( "Usage: %s\n"
+			 "Prompt for login credentials\n", argv[0] );
+		return 1;
+	}
+
+	if ( ( rc = login_ui() ) != 0 ) {
+		printf ( "Could not set credentials: %s\n",
+			 strerror ( rc ) );
+		return 1;
+	}
+
+	return 0;
+}
+
+struct command login_command __command = {
+	.name = "login",
+	.exec = login_exec,
+};