From 99670d895682d3a7ae23fbb0e9f5a3eb68d1fa33 Mon Sep 17 00:00:00 2001
From: Adrian Alonso <aalonso00@gmail.com>
Date: Tue, 3 Jul 2012 21:26:06 -0500
Subject: [PATCH] net-persistent-mac: allow for network device MAC persistency

Some network devices do not have a fixed MAC address however this is
important to allow auto-configuration in a DHCP network.

To accomplish it, in a more generic way, we store the MAC and restore
it *before* the network services are started thus compatible with
netbase and connman configurations.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Adrian Alonso <aalonso00@gmail.com>
---
 .../net-persistent-mac/net-persistent-mac.bb  | 23 ++++++++++
 .../net-persistent-mac/default                |  1 +
 .../net-persistent-mac/init                   | 42 +++++++++++++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 recipes-core/net-persistent-mac/net-persistent-mac.bb
 create mode 100644 recipes-core/net-persistent-mac/net-persistent-mac/default
 create mode 100644 recipes-core/net-persistent-mac/net-persistent-mac/init

diff --git a/recipes-core/net-persistent-mac/net-persistent-mac.bb b/recipes-core/net-persistent-mac/net-persistent-mac.bb
new file mode 100644
index 0000000..0784a01
--- /dev/null
+++ b/recipes-core/net-persistent-mac/net-persistent-mac.bb
@@ -0,0 +1,23 @@
+SUMMARY = "Network device MAC persistency"
+DESCRIPTION = "Provides support to store/restore the MAC of a specific network device"
+SECTION = "base"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
+
+inherit update-rc.d
+
+INITSCRIPT_NAME = "net-persistent-mac"
+INITSCRIPT_PARAMS = "start 39 S ."
+
+SRC_URI = "file://init \
+           file://default"
+
+do_install () {
+	install -d ${D}${sysconfdir}/init.d
+	install -m 0755 ${WORKDIR}/init ${D}${sysconfdir}/init.d/${PN}
+
+	install -d ${D}${sysconfdir}/default
+	install -m 0644 ${WORKDIR}/default ${D}${sysconfdir}/default/${PN}
+}
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
diff --git a/recipes-core/net-persistent-mac/net-persistent-mac/default b/recipes-core/net-persistent-mac/net-persistent-mac/default
new file mode 100644
index 0000000..9086f7b
--- /dev/null
+++ b/recipes-core/net-persistent-mac/net-persistent-mac/default
@@ -0,0 +1 @@
+INTERFACES=""
\ No newline at end of file
diff --git a/recipes-core/net-persistent-mac/net-persistent-mac/init b/recipes-core/net-persistent-mac/net-persistent-mac/init
new file mode 100644
index 0000000..a2e2863
--- /dev/null
+++ b/recipes-core/net-persistent-mac/net-persistent-mac/init
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+### BEGIN INIT INFO
+# Provides:          net-persistent-mac
+# Required-Start:    $local_fs
+# Required-Stop:
+# Default-Start:     S
+# Default-Stop:
+# X-Start-Before:    networking
+# Short-Description: restore MAC during boot process
+### END INIT INFO
+
+set -e
+
+[ -f /etc/default/net-persistent-mac ] && . /etc/default/net-persistent-mac
+
+MAC_DIR="/var/lib/net-persistent-mac"
+
+for if in $INTERFACES; do
+	mkdir -p "$MAC_DIR"
+	IF_FILE="$MAC_DIR/$if.mac"
+	IF_MAC="/sys/class/net/$if/address"
+
+	# Store MAC for reuse
+	if [ ! -r "$IF_FILE" ]; then
+		if [ -e "$IF_MAC" ]; then
+			echo "Storing MAC for $if for future use." > /dev/stderr
+			cat "$IF_MAC" > "$IF_FILE"
+		else
+			echo "Failed to read MAC for $if; skiping device."
+		fi
+	fi
+
+	if [ -r "$IF_FILE" ]; then
+		# Restore MAC setting
+		WANTED_MAC=`cat $IF_FILE`
+		if [ "$WANTED_MAC" != "`cat $IF_MAC`" ]; then
+			echo "Setting MAC of $if to $WANTED_MAC."
+			ifconfig $if hw ether "$WANTED_MAC"
+		fi
+	fi
+done