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# Copyright 2021 Verizon Media
#
# 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.
import base64
import gzip
import io
import os
import tempfile
from ironic_lib import utils as ironic_utils
from oslo_log import log as logging
import pycdlib
import requests
from ironic.common import exception
LOG = logging.getLogger(__name__)
def _get_config_drive_dict_from_iso(
iso_reader, drive_dict,
target_path='/var/lib/cloud/seed/config_drive'):
"""Traverse the config drive iso and extract content and filenames
:param iso_reader: pycdlib.PyCdlib object representing ISO files.
:param drive_dict: Mutable dictionary to store path and contents.
:param target_path: Path on the local disk in which the files in config
drive files has to be written.
"""
for path, dirlist, filelist in iso_reader.walk(iso_path='/'):
for f in filelist:
# In iso9660 file extensions are mangled. Example '/FOO/BAR;1'.
iso_file_path = os.path.join(path, f)
file_record = iso_reader.get_record(iso_path=iso_file_path)
# This converts /FOO/BAR;1 -> /foo/bar
posix_file_path = iso_reader.full_path_from_dirrecord(
file_record, rockridge=True
)
# Path to which the file in config drive to be written on the
# server.
posix_file_path = posix_file_path.lstrip('/')
target_file_path = os.path.join(target_path, posix_file_path)
b_buf = io.BytesIO()
iso_reader.get_file_from_iso_fp(
iso_path=iso_file_path, outfp=b_buf
)
b_buf.seek(0)
content = b"".join(b_buf.readlines()).decode('utf-8')
drive_dict[target_file_path] = content
def read_iso9600_config_drive(config_drive):
"""Read config drive and store it's contents in a dict
:param config_drive: Config drive in iso9600 format
:returns: A dict containing path as key and contents of the configdrive
file as value.
"""
config_drive_dict = dict()
with tempfile.NamedTemporaryFile(suffix='.iso') as iso:
iso.write(config_drive)
iso.flush()
try:
iso_reader = pycdlib.PyCdlib()
iso_reader.open(iso.name)
_get_config_drive_dict_from_iso(iso_reader, config_drive_dict)
iso_reader.close()
except Exception as e:
msg = "Error reading the config drive iso: %s" % e
LOG.error(msg)
return config_drive_dict
def decode_and_extract_config_drive_iso(config_drive_iso_gz):
try:
iso_gz_obj = io.BytesIO(base64.b64decode(config_drive_iso_gz))
iso_gz_obj.seek(0)
except Exception as exc:
if isinstance(config_drive_iso_gz, bytes):
LOG.debug('Config drive is not base64 encoded (%(error)s), '
'assuming binary', {'error': exc})
iso_gz_obj = config_drive_iso_gz
else:
error_msg = ('Config drive is not base64 encoded or the content '
'is malformed. %(cls)s: %(err)s.'
% {'err': exc, 'cls': type(exc).__name__})
raise exception.InstanceDeployFailure(error_msg)
try:
with gzip.GzipFile(fileobj=iso_gz_obj, mode='rb') as f:
config_drive_iso = f.read()
except Exception as exc:
error_msg = "Decoding/Extraction of config drive failed: %s" % exc
raise exception.InstanceDeployFailure(error_msg)
return config_drive_iso
def _fetch_config_drive_from_url(url):
try:
config_drive = requests.get(url).content
except requests.exceptions.RequestException as e:
raise exception.InstanceDeployFailure(
"Can't download the configdrive content from '%(url)s'. "
"Reason: %(reason)s" %
{'url': url, 'reason': e})
return config_drive
def _write_config_drive_content(content, file_path):
"""Generate post ks script to write each userdata content."""
content = base64.b64encode(str.encode(content))
kickstart_data = []
kickstart_data.append("\n")
kickstart_data.append("%post\n")
kickstart_data.append(("DIRPATH=`/usr/bin/dirname "
"{file_path}`\n").format(
file_path=file_path))
kickstart_data.append("/bin/mkdir -p $DIRPATH\n")
kickstart_data.append("CONTENT='{content}'\n".format(
content=content))
kickstart_data.append("echo $CONTENT | "
"/usr/bin/base64 --decode > "
"{file_path}".format(file_path=file_path))
kickstart_data.append("\n")
kickstart_data.append(
"/bin/chmod 600 {file_path}\n".format(file_path=file_path)
)
kickstart_data.append("%end\n\n")
return "".join(kickstart_data)
def prepare_config_drive(task,
config_drive_path='/var/lib/cloud/seed/config_drive'):
"""Prepare config_drive for writing to kickstart file"""
LOG.debug("Preparing config_drive to write to kickstart file")
node = task.node
config_drive = node.instance_info.get('configdrive')
ks_config_drive = ''
if not config_drive:
return ks_config_drive
if ironic_utils.is_http_url(config_drive):
config_drive = _fetch_config_drive_from_url(config_drive)
if not isinstance(config_drive, dict):
# The config drive is in iso6600 format, gzipped and base-64-encoded.
# Convert it to a dict.
config_drive_iso = decode_and_extract_config_drive_iso(config_drive)
config_drive = read_iso9600_config_drive(config_drive_iso)
for key in sorted(config_drive.keys()):
target_path = os.path.join(config_drive_path, key)
ks_config_drive += _write_config_drive_content(
config_drive[key], target_path
)
return ks_config_drive
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