From 6bf07b12d385560d87ce651b070284548c939f09 Mon Sep 17 00:00:00 2001
From: Clint Byrum <clint@fewbar.com>
Date: Thu, 21 Mar 2013 16:28:17 -0700
Subject: [PATCH] Set mysql server_id based on instance-id

Do nothing if we are booted on a server which has no instance-id set,
such as a non-cloud VM or server.

Change-Id: I6df81edbea1b2b4e4f1ef11a9f2ddaf100d98eda
---
 elements/mysql/install.d/10-mysql             |  1 +
 .../install.d/mysql-set-server-id.upstart     | 27 +++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 elements/mysql/install.d/mysql-set-server-id.upstart

diff --git a/elements/mysql/install.d/10-mysql b/elements/mysql/install.d/10-mysql
index 4bb3d474a..2593ff36d 100755
--- a/elements/mysql/install.d/10-mysql
+++ b/elements/mysql/install.d/10-mysql
@@ -6,5 +6,6 @@ set -e
 set -o xtrace
 
 install -D -m 0644 -o root -g root  $(dirname $0)/my.cnf /etc/mysql/my.cnf
+install $(dirname $0)/mysql-set-server-id.upstart /etc/init/mysql-set-server-id.conf
 
 install-packages sysstat mytop percona-toolkit mysql-server-5.5 mysql-client-5.5
diff --git a/elements/mysql/install.d/mysql-set-server-id.upstart b/elements/mysql/install.d/mysql-set-server-id.upstart
new file mode 100644
index 000000000..78454e2d5
--- /dev/null
+++ b/elements/mysql/install.d/mysql-set-server-id.upstart
@@ -0,0 +1,27 @@
+# vim: syntax=upstart
+description "Set mysql server_id based on instance-id"
+
+start on starting mysql
+task
+
+env INSTANCE_ID="/var/lib/cloud/data/instance-id"
+env CONF_TARGET="/etc/mysql/conf.d/server_id.cnf"
+
+pre-start script
+    if ! [ -e $INSTANCE_ID ] ; then
+        stop
+        exit 0
+    fi
+end script
+
+script
+    instance=$(cat $INSTANCE_ID)
+    server_id=$(python -c "print 0x${instance##i-}")
+    cat > $CONF_TARGET.new <<EOF
+# Generated by mysql-set-server-id upstart job $(date)
+# From $INSTANCE_ID ${instance}
+[mysqld]
+server_id = $server_id
+EOF
+    mv -f $CONF_TARGET.new $CONF_TARGET
+end script