305 lines
10 KiB
Python
305 lines
10 KiB
Python
# Copyright 2013 Rackspace, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import copy
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import glob
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import os
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import shutil
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import tempfile
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from oslo_concurrency import processutils
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from oslo_log import log as logging
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from oslo_utils import units
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from six.moves.urllib import parse
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from ironic_python_agent import errors
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LOG = logging.getLogger(__name__)
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SUPPORTED_ROOT_DEVICE_HINTS = set(('size', 'model', 'wwn', 'serial', 'vendor'))
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# Agent parameters can be pased by kernel command-line arguments and/or
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# by virtual media. Virtual media parameters passed would be available
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# when the agent is started, but might not be available for re-reading
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# later on because:
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# * Virtual media might be exposed from Swift and swift temp url might
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# expire.
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# * Ironic might have removed the floppy image from Swift after starting
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# the deploy.
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#
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# Even if it's available, there is no need to re-read from the device and
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# /proc/cmdline again, because it is never going to change. So we cache the
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# agent parameters that was passed (by proc/cmdline and/or virtual media)
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# when we read it for the first time, and then use this cache.
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AGENT_PARAMS_CACHED = dict()
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def execute(*cmd, **kwargs):
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"""Convenience wrapper around oslo's execute() method."""
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result = processutils.execute(*cmd, **kwargs)
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LOG.debug('Execution completed, command line is "%s"', ' '.join(cmd))
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LOG.debug('Command stdout is: "%s"', result[0])
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LOG.debug('Command stderr is: "%s"', result[1])
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return result
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def try_execute(*cmd, **kwargs):
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"""The same as execute but returns None on error."""
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try:
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return execute(*cmd, **kwargs)
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except (processutils.ProcessExecutionError, OSError) as e:
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LOG.debug('Command failed: %s', e)
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def _read_params_from_file(filepath):
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"""Extract key=value pairs from a file.
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:param filepath: path to a file containing key=value pairs separated by
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whitespace or newlines.
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:returns: a dictionary representing the content of the file
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"""
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with open(filepath) as f:
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cmdline = f.read()
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options = cmdline.split()
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params = {}
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for option in options:
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if '=' not in option:
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continue
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k, v = option.split('=', 1)
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params[k] = v
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return params
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def _get_vmedia_device():
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"""Finds the device filename of the virtual media device using sysfs.
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:returns: a string containing the filename of the virtual media device
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"""
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sysfs_device_models = glob.glob("/sys/class/block/*/device/model")
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vmedia_device_model = "virtual media"
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for model_file in sysfs_device_models:
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try:
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with open(model_file) as model_file_fobj:
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if vmedia_device_model in model_file_fobj.read().lower():
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vmedia_device = model_file.split('/')[4]
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return vmedia_device
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except Exception:
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pass
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def _get_vmedia_params():
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"""This method returns the parameters passed through virtual media floppy.
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:returns: a partial dict of potential agent configuration parameters
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:raises: VirtualMediaBootError when it cannot find the virtual media device
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"""
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parameters_file = "parameters.txt"
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vmedia_device_file = "/dev/disk/by-label/ir-vfd-dev"
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if not os.path.exists(vmedia_device_file):
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# TODO(rameshg87): This block of code is there only for compatibility
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# reasons (so that newer agent can work with older Ironic). Remove
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# this after Liberty release.
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vmedia_device = _get_vmedia_device()
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if not vmedia_device:
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msg = "Unable to find virtual media device"
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raise errors.VirtualMediaBootError(msg)
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vmedia_device_file = os.path.join("/dev", vmedia_device)
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vmedia_mount_point = tempfile.mkdtemp()
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try:
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try:
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stdout, stderr = execute("mount", vmedia_device_file,
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vmedia_mount_point)
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except processutils.ProcessExecutionError as e:
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msg = ("Unable to mount virtual media device %(device)s: "
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"%(error)s" % {'device': vmedia_device_file, 'error': e})
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raise errors.VirtualMediaBootError(msg)
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parameters_file_path = os.path.join(vmedia_mount_point,
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parameters_file)
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params = _read_params_from_file(parameters_file_path)
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try:
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stdout, stderr = execute("umount", vmedia_mount_point)
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except processutils.ProcessExecutionError as e:
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pass
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finally:
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try:
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shutil.rmtree(vmedia_mount_point)
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except Exception as e:
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pass
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return params
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def _get_cached_params():
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"""Helper method to get cached params to ease unit testing."""
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return AGENT_PARAMS_CACHED
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def _set_cached_params(params):
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"""Helper method to set cached params to ease unit testing."""
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global AGENT_PARAMS_CACHED
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AGENT_PARAMS_CACHED = params
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def get_agent_params():
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"""Gets parameters passed to the agent via kernel cmdline or vmedia.
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Parameters can be passed using either the kernel commandline or through
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virtual media. If boot_method is vmedia, merge params provided via vmedia
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with those read from the kernel command line.
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Although it should never happen, if a variable is both set by vmedia and
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kernel command line, the setting in vmedia will take precedence.
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:returns: a dict of potential configuration parameters for the agent
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"""
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# Check if we have the parameters cached
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params = _get_cached_params()
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if not params:
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params = _read_params_from_file('/proc/cmdline')
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# If the node booted over virtual media, the parameters are passed
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# in a text file within the virtual media floppy.
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if params.get('boot_method') == 'vmedia':
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vmedia_params = _get_vmedia_params()
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params.update(vmedia_params)
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# Cache the parameters so that it can be used later on.
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_set_cached_params(params)
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return copy.deepcopy(params)
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def normalize(string):
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"""Return a normalized string."""
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# Since we can't use space on the kernel cmdline, Ironic will
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# urlencode the values.
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return parse.unquote(string).lower().strip()
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def parse_root_device_hints():
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"""Parse the root device hints.
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Parse the root device hints given by Ironic via kernel cmdline
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or vmedia.
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:returns: A dict with the hints or an empty dict if no hints are
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passed.
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:raises: DeviceNotFound if there are unsupported hints.
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"""
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root_device = get_agent_params().get('root_device')
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if not root_device:
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return {}
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hints = dict((item.split('=') for item in root_device.split(',')))
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# Find invalid hints for logging
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not_supported = set(hints) - SUPPORTED_ROOT_DEVICE_HINTS
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if not_supported:
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error_msg = ('No device can be found because the following hints: '
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'"%(not_supported)s" are not supported by this version '
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'of IPA. Supported hints are: "%(supported)s"',
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{'not_supported': ', '.join(not_supported),
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'supported': ', '.join(SUPPORTED_ROOT_DEVICE_HINTS)})
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raise errors.DeviceNotFound(error_msg)
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# Normalise the values
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hints = {k: normalize(v) for k, v in hints.items()}
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if 'size' in hints:
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# NOTE(lucasagomes): Ironic should validate before passing to
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# the deploy ramdisk
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hints['size'] = int(hints['size'])
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return hints
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class AccumulatedFailures(object):
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"""Object to accumulate failures without raising exception."""
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def __init__(self, exc_class=RuntimeError):
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self._failures = []
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self._exc_class = exc_class
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def add(self, fail, *fmt):
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"""Add failure with optional formatting.
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:param fail: exception or error string
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:param fmt: formatting arguments (only if fail is a string)
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"""
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if fmt:
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fail = fail % fmt
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LOG.error('%s', fail)
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self._failures.append(fail)
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def get_error(self):
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"""Get error string or None."""
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if not self._failures:
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return
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msg = ('The following errors were encountered:\n%s'
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% '\n'.join('* %s' % item for item in self._failures))
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return msg
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def raise_if_needed(self):
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"""Raise exception if error list is not empty.
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:raises: RuntimeError
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"""
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if self._failures:
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raise self._exc_class(self.get_error())
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def __nonzero__(self):
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return bool(self._failures)
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__bool__ = __nonzero__
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def __repr__(self): # pragma: no cover
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# This is for tests
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if self:
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return '<%s: %s>' % (self.__class__.__name__,
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', '.join(self._failures))
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else:
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return '<%s: success>' % self.__class__.__name__
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def guess_root_disk(block_devices, min_size_required=4 * units.Gi):
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"""Find suitable disk provided that root device hints are not given.
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If no hints are passed find the first device larger than min_size_required,
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assume it is the OS disk
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"""
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# TODO(russellhaering): This isn't a valid assumption in
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# all cases, is there a more reasonable default behavior?
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block_devices.sort(key=lambda device: device.size)
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if not block_devices or block_devices[-1].size < min_size_required:
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raise errors.DeviceNotFound(
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"No suitable device was found "
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"for deployment - root device hints were not provided "
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"and all found block devices are smaller than %iB."
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% min_size_required)
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for device in block_devices:
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if device.size >= min_size_required:
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return device
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