exts: Add openstack configure/write exts

openstackssh.write: Write extension which deploy a raw image of baserock
directly to an OpenStack machine using python-glanceclient. The raw image
deployed has modified its bootloader to use virtio disks.

vdaboot.configure: Configuration extension to change the mount point of
"/" to use virtio disks (/dev/vda).

2 files changed, 174 insertions, 0 deletions

diff --git a/morphlib/exts/openstack.write b/morphlib/exts/openstack.write
new file mode 100755
index 00000000..8ee8767e
--- /dev/null
+++ b/morphlib/exts/openstack.write
@@ -0,0 +1,140 @@
+#!/usr/bin/python
+# Copyright (C) 2013  Codethink Limited
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+'''A Morph deployment write extension for deploying to OpenStack.'''
+
+
+import cliapp
+import os
+import tempfile
+import urlparse
+
+import morphlib.writeexts
+
+
+class OpenStackWriteExtension(morphlib.writeexts.WriteExtension):
+
+    '''Configure a raw disk image into an OpenStack host.
+
+    The raw disk image is created during Morph's deployment and the
+    image is deployed in OpenStack using python-glanceclient.
+    
+    The location command line argument is the authentification url
+    of the OpenStack server using the following syntax:
+ 
+    http://HOST:PORT/VERSION
+
+    where
+
+    * HOST is the host running OpenStack
+    * PORT is the port which is using OpenStack for authentifications.
+    * VERSION is the authentification version of OpenStack (Only v2.0
+      supported)
+
+    This extension needs in the environment the following variables:
+ 
+    * OPENSTACK_USER is the username to use in the deployment.
+    * OPENSTACK_TENANT is the project name to use in the deployment.
+    * OPENSTACK_IMAGENAME is the name of the image to create.
+    * OPENSTACK_PASSWORD is the password of the user.
+        
+
+    The extension will connect to OpenStack using python-glanceclient
+    to configure a raw image.
+    
+    '''
+
+    def process_args(self, args):
+        if len(args) != 2:
+            raise cliapp.AppException('Wrong number of command line args')
+        
+        temp_root, location = args
+        self.check_location(location)
+
+        os_params = self.get_openstack_parameters()
+
+        fd, raw_disk = tempfile.mkstemp()
+        os.close(fd)
+        self.create_local_system(temp_root, raw_disk)
+        self.status(msg='Temporary disk image has been created at %s' 
+                    % raw_disk)
+
+        self.set_extlinux_root_to_virtio(raw_disk)
+
+        self.configure_openstack_image(raw_disk, location, os_params)
+
+    def set_extlinux_root_to_virtio(self, raw_disk):
+        '''Re-configures extlinux to use virtio disks'''
+        self.status(msg='Updating extlinux.conf')
+        mp = self.mount(raw_disk)
+        try:
+            path = os.path.join(mp, 'extlinux.conf')
+
+            with open(path) as f:
+                extlinux_conf = f.read()
+
+            extlinux_conf = extlinux_conf.replace('root=/dev/sda',
+                                                  'root=/dev/vda')
+            with open(path, "w") as f:
+                f.write(extlinux_conf)
+
+        finally:
+            self.unmount(mp)
+
+    def get_openstack_parameters(self):
+        '''Check the environment variables needed and returns all.
+
+        The environment variables are described in the class documentation.
+        '''
+
+        keys = ('OPENSTACK_USER', 'OPENSTACK_TENANT',
+                'OPENSTACK_IMAGENAME', 'OPENSTACK_PASSWORD')
+        for key in keys:
+            if key not in os.environ:
+                raise cliapp.AppException(key + ' was not given')
+        return (os.environ[key] for key in keys)
+
+    def check_location(self, location):
+        x = urlparse.urlparse(location)
+        if x.scheme != 'http':
+            raise cliapp.AppException('URL schema must be http in %s' \
+                                      % location)
+        if (x.path != '/v2.0' and x.path != '/v2.0/'):
+            raise cliapp.AppException('API version must be v2.0 in %s'\
+                                      % location)
+
+    def configure_openstack_image(self, raw_disk, auth_url, os_params):
+        '''Configure the image in OpenStack using glance-client'''
+        self.status(msg='Configuring OpenStack image...')
+
+        username, tenant_name, image_name, password = os_params
+        cmdline = ['glance',
+                   '--os-username', username,
+                   '--os-tenant-name', tenant_name,
+                   '--os-password', password,
+                   '--os-auth-url', auth_url,
+                   'image-create',
+                   '--name=%s' % image_name,
+                   '--disk-format=raw',
+                   '--container-format', 'bare',
+                   '--file', raw_disk]
+        cliapp.runcmd(cmdline)
+
+        self.status(msg='Image configured.')
+
+OpenStackWriteExtension().run()
+
diff --git a/morphlib/exts/vdaboot.configure b/morphlib/exts/vdaboot.configure
new file mode 100755
index 00000000..cb54bf0d
--- /dev/null
+++ b/morphlib/exts/vdaboot.configure
@@ -0,0 +1,34 @@
+#!/bin/sh
+# Copyright (C) 2013  Codethink Limited
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+# Change the "/" mount point to /dev/vda to use virtio disks.
+
+set -e
+
+if [ "$OPENSTACK_USER" ]
+then	
+    # Modifying fstab 
+    if [ -f "$1/etc/fstab" ]
+    then
+        mv "$1/etc/fstab" "$1/etc/fstab.old"
+        awk 'BEGIN {print "/dev/vda / btrfs defaults,rw,noatime 0 1"};
+             $2 != "/" {print $0 };' "$1/etc/fstab.old" > "$1/etc/fstab"
+        rm "$1/etc/fstab.old"
+    else
+        echo "/dev/vda / btrfs defaults,rw,noatime 0 1"> "$1/etc/fstab"
+    fi
+fi