diff options
Diffstat (limited to 'cloudinit/sources/helpers')
| -rw-r--r-- | cloudinit/sources/helpers/openstack.py | 157 |
1 files changed, 104 insertions, 53 deletions
diff --git a/cloudinit/sources/helpers/openstack.py b/cloudinit/sources/helpers/openstack.py index 0fac0335..b7e19314 100644 --- a/cloudinit/sources/helpers/openstack.py +++ b/cloudinit/sources/helpers/openstack.py @@ -21,6 +21,7 @@ import abc import base64 import copy +import functools import os from cloudinit import ec2_utils @@ -48,6 +49,7 @@ OS_LATEST = 'latest' OS_FOLSOM = '2012-08-10' OS_GRIZZLY = '2013-04-04' OS_HAVANA = '2013-10-17' +# keep this in chronological order. new supported versions go at the end. OS_VERSIONS = ( OS_FOLSOM, OS_GRIZZLY, @@ -150,17 +152,40 @@ class BaseReader(object): pass @abc.abstractmethod - def _path_exists(self, path): + def _path_read(self, path): pass @abc.abstractmethod - def _path_read(self, path): + def _fetch_available_versions(self): pass @abc.abstractmethod def _read_ec2_metadata(self): pass + def _find_working_version(self): + try: + versions_available = self._fetch_available_versions() + except Exception as e: + LOG.debug("Unable to read openstack versions from %s due to: %s", + self.base_path, e) + versions_available = [] + + # openstack.OS_VERSIONS is stored in chronological order, so + # reverse it to check newest first. + supported = [v for v in reversed(list(OS_VERSIONS))] + selected_version = OS_LATEST + + for potential_version in supported: + if potential_version not in versions_available: + continue + selected_version = potential_version + break + + LOG.debug("Selected version '%s' from %s", selected_version, + versions_available) + return selected_version + def _read_content_path(self, item): path = item.get('content_path', '').lstrip("/") path_pieces = path.split("/") @@ -170,24 +195,7 @@ class BaseReader(object): path = self._path_join(self.base_path, "openstack", *path_pieces) return self._path_read(path) - def _find_working_version(self, version): - search_versions = [version] + list(OS_VERSIONS) - for potential_version in search_versions: - if not potential_version: - continue - path = self._path_join(self.base_path, "openstack", - potential_version) - if self._path_exists(path): - if potential_version != version: - LOG.debug("Version '%s' not available, attempting to use" - " version '%s' instead", version, - potential_version) - return potential_version - LOG.debug("Version '%s' not available, attempting to use '%s'" - " instead", version, OS_LATEST) - return OS_LATEST - - def read_v2(self, version=None): + def read_v2(self): """Reads a version 2 formatted location. Return a dict with metadata, userdata, ec2-metadata, dsmode, @@ -196,6 +204,9 @@ class BaseReader(object): If not a valid location, raise a NonReadable exception. """ + load_json_anytype = functools.partial( + util.load_json, root_types=(dict, basestring, list)) + def datafiles(version): files = {} files['metadata'] = ( @@ -214,29 +225,32 @@ class BaseReader(object): files['vendordata'] = ( self._path_join("openstack", version, 'vendor_data.json'), False, - util.load_json, + load_json_anytype, ) return files - version = self._find_working_version(version) results = { 'userdata': '', 'version': 2, } - data = datafiles(version) + data = datafiles(self._find_working_version()) for (name, (path, required, translator)) in data.iteritems(): path = self._path_join(self.base_path, path) data = None found = False - if self._path_exists(path): - try: - data = self._path_read(path) - except IOError: - raise NonReadable("Failed to read: %s" % path) - found = True + try: + data = self._path_read(path) + except IOError as e: + if not required: + LOG.debug("Failed reading optional path %s due" + " to: %s", path, e) + else: + LOG.debug("Failed reading mandatory path %s due" + " to: %s", path, e) else: - if required: - raise NonReadable("Missing mandatory path: %s" % path) + found = True + if required and not found: + raise NonReadable("Missing mandatory path: %s" % path) if found and translator: try: data = translator(data) @@ -304,21 +318,27 @@ class BaseReader(object): class ConfigDriveReader(BaseReader): def __init__(self, base_path): super(ConfigDriveReader, self).__init__(base_path) + self._versions = None def _path_join(self, base, *add_ons): components = [base] + list(add_ons) return os.path.join(*components) - def _path_exists(self, path): - return os.path.exists(path) - def _path_read(self, path): return util.load_file(path) + def _fetch_available_versions(self): + if self._versions is None: + path = self._path_join(self.base_path, 'openstack') + found = [d for d in os.listdir(path) + if os.path.isdir(os.path.join(path))] + self._versions = found + return self._versions + def _read_ec2_metadata(self): path = self._path_join(self.base_path, 'ec2', 'latest', 'meta-data.json') - if not self._path_exists(path): + if not os.path.exists(path): return {} else: try: @@ -338,7 +358,7 @@ class ConfigDriveReader(BaseReader): found = {} for name in FILES_V1.keys(): path = self._path_join(self.base_path, name) - if self._path_exists(path): + if os.path.exists(path): found[name] = path if len(found) == 0: raise NonReadable("%s: no files found" % (self.base_path)) @@ -400,17 +420,26 @@ class MetadataReader(BaseReader): self.ssl_details = ssl_details self.timeout = float(timeout) self.retries = int(retries) + self._versions = None + + def _fetch_available_versions(self): + # <baseurl>/openstack/ returns a newline separated list of versions + if self._versions is not None: + return self._versions + found = [] + version_path = self._path_join(self.base_path, "openstack") + content = self._path_read(version_path) + for line in content.splitlines(): + line = line.strip() + if not line: + continue + found.append(line) + self._versions = found + return self._versions def _path_read(self, path): - response = url_helper.readurl(path, - retries=self.retries, - ssl_details=self.ssl_details, - timeout=self.timeout) - return response.contents - def _path_exists(self, path): - - def should_retry_cb(request, cause): + def should_retry_cb(_request_args, cause): try: code = int(cause.code) if code >= 400: @@ -420,15 +449,12 @@ class MetadataReader(BaseReader): pass return True - try: - response = url_helper.readurl(path, - retries=self.retries, - ssl_details=self.ssl_details, - timeout=self.timeout, - exception_cb=should_retry_cb) - return response.ok() - except IOError: - return False + response = url_helper.readurl(path, + retries=self.retries, + ssl_details=self.ssl_details, + timeout=self.timeout, + exception_cb=should_retry_cb) + return response.contents def _path_join(self, base, *add_ons): return url_helper.combine_url(base, *add_ons) @@ -437,3 +463,28 @@ class MetadataReader(BaseReader): return ec2_utils.get_instance_metadata(ssl_details=self.ssl_details, timeout=self.timeout, retries=self.retries) + + +def convert_vendordata_json(data, recurse=True): + """ data: a loaded json *object* (strings, arrays, dicts). + return something suitable for cloudinit vendordata_raw. + + if data is: + None: return None + string: return string + list: return data + the list is then processed in UserDataProcessor + dict: return convert_vendordata_json(data.get('cloud-init')) + """ + if not data: + return None + if isinstance(data, (str, unicode, basestring)): + return data + if isinstance(data, list): + return copy.deepcopy(data) + if isinstance(data, dict): + if recurse is True: + return convert_vendordata_json(data.get('cloud-init'), + recurse=False) + raise ValueError("vendordata['cloud-init'] cannot be dict") + raise ValueError("Unknown data type for vendordata: %s" % type(data)) |