From a8707cc1524b22cd9416134b592a4d1e1d3e7747 Mon Sep 17 00:00:00 2001
From: Robert Collins <rbtcollins@hp.com>
Date: Thu, 9 May 2013 18:39:37 +1200
Subject: [PATCH] Add an element to configure a serial console.

With ILO and other remote machine management cards, a serial console is
actually useful.

Change-Id: I86f74d9dae3821b4682df813c5b52a83a29a138a
---
 elements/serial-console/README.md            |  5 +++++
 elements/serial-console/install.d/20-stty    |  7 +++++++
 elements/serial-console/install.d/ttySx.conf | 15 +++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 elements/serial-console/README.md
 create mode 100755 elements/serial-console/install.d/20-stty
 create mode 100644 elements/serial-console/install.d/ttySx.conf

diff --git a/elements/serial-console/README.md b/elements/serial-console/README.md
new file mode 100644
index 00000000..202a5788
--- /dev/null
+++ b/elements/serial-console/README.md
@@ -0,0 +1,5 @@
+Start getty on ttyS0 or ttyS1
+
+With ILO and other remote admin environments, having a serial console can be
+useful for debugging / troubleshooting. If ttyS1 exists, getty will run on
+that, otherwise on ttyS0.
diff --git a/elements/serial-console/install.d/20-stty b/elements/serial-console/install.d/20-stty
new file mode 100755
index 00000000..f8fa8e5f
--- /dev/null
+++ b/elements/serial-console/install.d/20-stty
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+home=$(dirname $0)
+set -uex
+
+install -m 0644 -o root -g root $home/ttySx.conf /etc/init/ttySx.conf
+
diff --git a/elements/serial-console/install.d/ttySx.conf b/elements/serial-console/install.d/ttySx.conf
new file mode 100644
index 00000000..2e11205b
--- /dev/null
+++ b/elements/serial-console/install.d/ttySx.conf
@@ -0,0 +1,15 @@
+# This service maintains a getty on ttyS0/1 from the point the system is
+# started until it is shut down again.
+
+start on stopped rc or RUNLEVEL=[2345]
+stop on runlevel [!2345]
+
+respawn
+
+script
+        console_port=0
+        echo "ttySx probing ttyS1" >/dev/ttyS1 2>/dev/null && console_port=1
+        echo "ttySx:  console tty = /dev/ttyS$console_port" >&2
+        exec /sbin/agetty -m ttyS$console_port 115200,57600,38400,9600,4800 vt102
+
+end script