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#!/usr/bin/python
#
# Fetch and run user-data from EC2
# Copyright (C) 2008-2009 Canonical Ltd.
#
# Author: Soren Hansen <soren@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# 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, see <http://www.gnu.org/licenses/>.
#
import email
import os
import subprocess
import tempfile
from xml.dom.minidom import parse, parseString
import ec2init
content_type_handlers = {}
def handler(mimetype):
return lambda f: register_handler(mimetype, f)
def register_handler(mimetype, func):
content_type_handlers[mimetype] = func
return func
def handle_part(part):
if part.is_multipart():
for p in part.get_payload():
handle_part(p)
else:
if part.get_content_type() in content_type_handlers:
content_type_handlers[part.get_content_type](part.get_payload())
return
handle_unknown_payload(part.get_payload())
def handle_unknown_payload(payload):
# Try to detect magic
if payload.startswith('#!'):
content_type_handlers['text/x-shellscript'](payload)
return
if payload.startswith('<appliance>'):
content_type_handlers['text/x-appliance-config'](payload)
@handler('text/x-appliance-config')
def handle_appliance_config(payload):
app = ApplianceConfig(payload)
app.handle()
@handler('text/x-ebs-mount-description')
def handle_ebs_mount_description(payload):
(volume_description, paths) = payload.split(':')
(identifier_type, identifier) = volume_description.split('=')
if identifier_type == 'device':
device = identifier
# Perhaps some day the volume id -> device path mapping
# will be exposed through meta-data.
# elif identifier_type == 'volume':
# device = extract_device_name_from_meta_data
else:
return
mount_ebs_volume(device, paths.split(','))
def mount_ebs_volume(device, paths):
if os.path.exists('ec2-init-appliance-ebs-volume-mount.sh'):
helper = './ec2-init-appliance-ebs-volume-mount.sh'
else:
helper = '/usr/share/ec2-init/ec2-init-appliance-ebs-volume-mount.sh'
helper = subprocess.Popen([helper, device] + paths, stdout=subprocess.PIPE)
stdout, stderr = helper.communicate()
return stdout
@handler('text/x-shellscript')
def handle_shell_script(payload):
(fd, path) = tempfile.mkstemp()
fp = os.fdopen(fd, 'a')
fp.write(payload)
fp.close()
os.chmod(path, 0700)
# Run the user data script and pipe its output to logger
user_data_process = subprocess.Popen([path], stdout=subprocess.PIPE)
logger_process = subprocess.Popen(['logger', '-t', 'user-data'], stdin=user_data_process.stdout)
logger_process.communicate()
os.unlink(path)
class ApplianceConfig(object):
def __init__(self, data):
self.data = data
def handle(self):
self.dom = parseString(self.data)
if self.dom.childNodes[0].tagName == 'appliance':
root = self.dom.childNodes[0]
else:
return
for node in root.childNodes:
if node.tagName == 'package':
pkg = None
for subnode in node.childNodes:
if subnode.nodeType == root.TEXT_NODE:
pkg = subnode.nodeValue
if not pkg:
# Something's fishy. We should have been passed the name of
# a package.
return
if node.getAttribute('action') == 'remove':
remove_package(pkg)
else:
install_package(pkg)
elif node.tagName == 'script':
script = ''
for subnode in node.childNodes:
# If someone went through the trouble of wrapping it in CDATA,
# it's probably the script we want to run..
if subnode.nodeType == root.CDATA_SECTION_NODE:
script = subnode.nodeValue
# ..however, fall back to whatever TEXT_NODE stuff is between
# the <script> tags.
if subnode.nodeType == root.TEXT_NODE and not script:
script = subnode.nodeValue
if not script:
# An empty script?
continue
content_type_handlers['text/x-shellscript'](script)
elif node.tagName == 'storage':
paths = []
device = node.getAttribute('device')
for subnode in node.childNodes:
if subnode.tagName == 'path':
for subsubnode in subnode.childNodes:
if subsubnode.nodeType == root.TEXT_NODE:
paths += [subsubnode.nodeValue.strip()]
break
mount_ebs_volume(device, paths)
def main():
ec2 = ec2init.EC2Init()
user_data = get_user_data()
msg = parse_user_data(user_data)
handle_part(msg)
def get_user_data():
return ec2.get_user_data()
def parse_user_data(user_data):
return email.message_from_string(user_data)
def install_remove_package(pkg, action):
apt_get = subprocess.Popen(['apt-get', action, pkg], stdout=subprocess.PIPE)
logger_process = subprocess.Popen(['logger', '-t', 'user-data'], stdin=apt_get.stdout)
logger_process.communicate()
def install_package(pkg):
return install_remove_package(pkg, 'install')
def remove_package(pkg):
return install_remove_package(pkg, 'remove')
if __name__ == '__main__':
main()
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