Add support to launch node for attaching volumes

We are using cinder block devices more and more. Update launch node so
that it can attach a preexisting cinder volume against a new nova server
on first boot. This will allow puppet or other config management to
format and mount that block device into the VMs filesystem.

Change-Id: Ic121cdc06dcbea0e38e8d0ff8946e999af3d727e

launch/launch-node.py

@@ -52,8 +52,8 @@ def get_client():
     return client
 
 
-def bootstrap_server(
-        server, admin_pass, key, cert, environment, name, puppetmaster):
+def bootstrap_server(server, admin_pass, key, cert, environment, name,
+                     puppetmaster, volume):
     ip = utils.get_public_ip(server)
     if not ip:
         raise Exception("Unable to find public ip of server")
@@ -88,6 +88,11 @@ def bootstrap_server(
                    'make_swap.sh')
     ssh_client.ssh('bash -x make_swap.sh')
 
+    if volume:
+        ssh_client.scp(os.path.join(SCRIPT_DIR, '..', 'mount_volume.sh'),
+                       'mount_volume.sh')
+        ssh_client.ssh('bash -x mount_volume.sh')
+
     ssh_client.scp(os.path.join(SCRIPT_DIR, '..', 'install_puppet.sh'),
                    'install_puppet.sh')
     ssh_client.ssh('bash -x install_puppet.sh')
@@ -124,7 +129,7 @@ def bootstrap_server(
 
 
 def build_server(
-        client, name, image, flavor, cert, environment, puppetmaster):
+        client, name, image, flavor, cert, environment, puppetmaster, volume):
     key = None
     server = None
 
@@ -148,8 +153,14 @@ def build_server(
     try:
         admin_pass = server.adminPass
         server = utils.wait_for_resource(server)
+        if volume:
+            vobj = client.volumes.create_server_volume(
+                server.id, volume, None)
+        if not vobj:
+            raise Exception("Couldn't attach volume")
+
         bootstrap_server(server, admin_pass, key, cert, environment, name,
-                         puppetmaster)
+                         puppetmaster, volume)
         print('UUID=%s\nIPV4=%s\nIPV6=%s\n' % (server.id,
                                                server.accessIPv4,
                                                server.accessIPv6))
@@ -181,6 +192,9 @@ def main():
                         "hostname.example.com.pem)")
     parser.add_argument("--server", dest="server", help="Puppetmaster to use.",
                         default="ci-puppetmaster.openstack.org")
+    parser.add_argument("--volume", dest="volume",
+                        help="UUID of volume to attach to the new server.",
+                        default=None)
     options = parser.parse_args()
 
     client = get_client()
@@ -220,7 +234,7 @@ def main():
     print "Found image", image
 
     build_server(client, options.name, image, flavor, cert,
-                 options.environment, options.server)
+                 options.environment, options.server, options.volume)
     dns.print_dns(client, options.name)
 
 if __name__ == '__main__':

mount_volume.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+# Sigh. nova volume-attach is not immediate, but there is no status to track
+sleep 120
+
+if [ -b /dev/vdc ]; then
+    DEV='/dev/vdc'
+elif [ -b /dev/xvdb ]; then
+    DEV='/dev/xvdb'
+else
+    echo "Could not mount volume"
+    exit 1
+fi
+if ! blkid | grep $DEV | grep ext4 ; then
+    mkfs.ext4 ${DEV}
+fi
+perl -nle "m,${DEV}, || print" -i /etc/fstab
+if [ ! -d /srv ] ; then
+    mkdir -p /srv
+fi
+echo "${DEV}  /srv  ext4  errors=remount-ro,barrier=0  0  2" >> /etc/fstab
+mount -a