Change the UUID of the root volume on first boot. Fixes #40

CHANGELOG.md

@@ -1,6 +1,8 @@
 ### 2012-11-18 Anders Ingemann <[email protected]> ###
 
 #### Major changes: ####
+* Add `change-root-uuid` script
+  (see [this issue for more info](https://github.com/andsens/ec2debian-build-ami/issues/40))
 * Remove contrib and non-free from apt/sources.list  
 (thanks to zack for finding this and James for the patch)
 

init.d/change-root-uuid

@@ -0,0 +1,28 @@
+#!/bin/bash
+### BEGIN INIT INFO
+# Provides:       change-root-uuid
+# Required-Start: 
+# Required-Stop:  
+# Should-Start:   
+# Should-Stop:    
+# Default-Start:  2 3 4 5
+# Default-Stop:   
+# Description:    Changes the UUID of the root volume
+### END INIT INFO
+
+prog=$(basename $0)
+logger="logger -t $prog"
+
+device_path="/dev/xvda1"
+
+filesystem=`blkid | grep $device_path | sed 's#\(.*\):.*TYPE="\(.*\)".*#\2#'`
+
+case $filesystem in
+	ext2) tune2fs -U random $device_path ;;
+	ext3) tune2fs -U random $device_path ;;
+	ext4) tune2fs -U random $device_path ;;
+	*)    $logger "The filesystem $filesystem was not recognized. Unable to change its UUID." ;;
+esac
+
+# Disable this script, it may only run once
+insserv -r $0

tasks/50-ec2-scripts

@@ -4,3 +4,11 @@ init_scripts+=("$scriptdir/init.d/generate-ssh-hostkeys")
 init_scripts+=("$scriptdir/init.d/ec2-get-credentials")
 init_scripts+=("$scriptdir/init.d/ec2-run-user-data")
 init_scripts+=("$scriptdir/init.d/expand-volume")
+
+case $filesystem in
+	# xfs cannot change the UUID on mounted volumes
+	xfs)  ;;
+	ext2) init_scripts+=("$scriptdir/init.d/change-root-uuid") ;;
+	ext3) init_scripts+=("$scriptdir/init.d/change-root-uuid") ;;
+	ext4) init_scripts+=("$scriptdir/init.d/change-root-uuid") ;;
+esac