Add element to call os-refresh-config

os-refresh-config simply runs things in a predictable order in directories
that other elements can populate. This element installs it and sets it
up to run at boot.

We also modify os-config-applier element to be called by this rather
than to have its own upstart job. This provides an example of how other
elements can insert themselves into the refresh process.

Change-Id: I52d72b7fd302ec317840af87fa77299387af99ad

elements/os-config-applier/install.d/50-os-config-applier

@@ -9,8 +9,10 @@ pip install -U git+https://github.com/tripleo/os-config-applier.git
 mkdir -p /opt/stack
 git clone $TEMPLATES /opt/stack/openstack-config-templates
 
-cat > /etc/init/os-config-applier.conf <<- eof
-start on runlevel [2345]
-task
+runscript=$(os-refresh-config --print-base)/configuration.d/10-os-config-applier
+mkdir -p $(dirname $runscript)
+cat > $runscript <<- eof
+#!/bin/sh
 exec os-config-applier -t /opt/stack/openstack-config-templates/templates
 eof
+chmod 0755 $runscript

elements/os-refresh-config/README.md

@@ -0,0 +1,7 @@
+Install os-refresh-config.
+
+os-refresh-config uses run-parts to run scripts in a pre-defined set
+of directories. Its intended purpose is to quiesce (pre-configure.d),
+configure (configure.d), migrate (migration.d), and then activate
+(post-configure.d) a configuration on first boot or in response to Heat
+Metadata changes.

elements/os-refresh-config/element-deps

@@ -0,0 +1 @@
+heat-jeos

elements/os-refresh-config/install.d/01-os-refresh-config

@@ -0,0 +1,15 @@
+#!/bin/bash
+# We need to install this early in install.d because other elements will
+# need to use os-refresh-config --print-base to know where to put files
+
+set -eux
+
+install-packages git-core python-pip
+
+pip install git+https://github.com/tripleo/os-refresh-config.git
+
+cat > /etc/init/os-refresh-config.conf <<- eof
+start on runlevel [2345]
+task
+exec os-refresh-config
+eof