convert devstack support to external plugin

This uses the defined external plugin interface for devstack to run
the ec2-api service.

Change-Id: I1d7507c904dc0df452049433ceac34793595176f

contrib/devstack/README.rst

@@ -1,20 +0,0 @@
-1. Follow Devstack documentation to setup a host for Devstack. Then clone
-   Devstack source code.
-
-2. Copy ec2-api integration scripts to Devstack::
-
-      $ cp lib/ec2-api ${DEVSTACK_DIR}/lib
-      $ cp extras.d/70-ec2-api.sh ${DEVSTACK_DIR}/extras.d
-
-3. Create a ``localrc`` file as input to devstack.
-
-4. The ec2-api services are not enabled by default, so they must be
-   enabled in ``localrc`` before running ``stack.sh``. This example ``localrc``
-   file shows all of the settings required for ec2-api::
-
-      # Enable ec2-api
-      enable_service ec2-api
-
-5. Deploy your OpenStack Cloud with ec2-api::
-
-   $ ./stack.sh

contrib/devstack/extras.d/70-ec2-api.sh

@@ -1,24 +0,0 @@
-# ec2-api.sh - DevStack extras script to install ec2-api
-
-if is_service_enabled ec2-api; then
-    if [[ "$1" == "source" ]]; then
-        # Initial source
-        source $TOP_DIR/lib/ec2-api
-    elif [[ "$1" == "stack" && "$2" == "install" ]]; then
-        echo_summary "Installing ec2-api"
-        install_ec2api
-    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
-        echo_summary "Configuring ec2-api"
-        configure_ec2api
-        create_ec2api_accounts
-    elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
-        echo_summary "Initializing ec2-api"
-        init_ec2api
-        start_ec2api
-    fi
-
-    if [[ "$1" == "unstack" ]]; then
-        stop_ec2api
-        cleanup_ec2api
-    fi
-fi

devstack/README.rst

@@ -0,0 +1,13 @@
+======================
+ Enabling in Devstack
+======================
+
+1. Download DevStack
+
+2. Add this repo as an external repository::
+
+     > cat local.conf
+     [[local|localrc]]
+     enable_plugin ec2-api https://github.com/stackforge/ec2-api
+
+3. run ``stack.sh``

devstack/plugin.sh

@@ -20,10 +20,6 @@ set -o xtrace
 # Defaults
 # --------
 
-# Set up default repos
-EC2API_REPO=${EC2API_REPO:-${GIT_BASE}/stackforge/ec2-api.git}
-EC2API_BRANCH=${EC2API_BRANCH:-master}
-
 # Set up default directories
 EC2API_DIR=$DEST/ec2-api
 EC2API_CONF_DIR=${EC2API_CONF_DIR:-/etc/ec2api}
@@ -211,8 +207,6 @@ function init_ec2api() {
 
 # install_ec2api() - Collect source and prepare
 function install_ec2api() {
-    git_clone $EC2API_REPO $EC2API_DIR $EC2API_BRANCH
-
     # TODO(ruhe): use setup_develop once ec2api requirements match with global-requirement.txt
     # both functions (setup_develop and setup_package) are defined at:
     # http://git.openstack.org/cgit/openstack-dev/devstack/tree/functions-common
@@ -238,6 +232,25 @@ function cleanup_ec2api() {
     sudo rm -rf $EC2API_KEYSTONE_SIGNING_DIR
 }
 
+# main dispatcher
+if [[ "$1" == "stack" && "$2" == "install" ]]; then
+    echo_summary "Installing ec2-api"
+    install_ec2api
+elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+    echo_summary "Configuring ec2-api"
+    configure_ec2api
+    create_ec2api_accounts
+elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+    echo_summary "Initializing ec2-api"
+    init_ec2api
+    start_ec2api
+fi
+
+if [[ "$1" == "unstack" ]]; then
+    stop_ec2api
+    cleanup_ec2api
+fi
+
 # Restore xtrace
 $XTRACE
 

devstack/settings

@@ -0,0 +1,4 @@
+# Devstack settings
+
+# we have to add ec2-api to enabled services for screen_it to work
+enable_service ec2-api