def _CheckExtStorageFile(base_dir, filename, required):
"""Check prereqs for an ExtStorage file.
Check if file exists, if it is a regular file and in case it is
one of extstorage scripts if it is executable.
@type base_dir: string
@param base_dir: Base directory containing ExtStorage installations.
@type filename: string
@param filename: The basename of the ExtStorage file.
@type required: bool
@param required: Whether the file is required or not.
@rtype: String
@return: The file path if the file is found and is valid,
None if the file is not found and not required.
@raises BlockDeviceError: In case prereqs are not met
(found and not valid/executable, not found and required)
"""
file_path = utils.PathJoin(base_dir, filename)
try:
st = os.stat(file_path)
except EnvironmentError, err:
if not required:
logging.info("Optional file '%s' under path '%s' is missing",
filename, base_dir)
return None
base.ThrowError("File '%s' under path '%s' is missing (%s)" %
(filename, base_dir, utils.ErrnoOrStr(err)))
def _check_socket(self):
sock_stat = None
try:
sock_stat = os.stat(self.monitor_filename)
except EnvironmentError, err:
if err.errno == errno.ENOENT:
raise errors.HypervisorError("No monitor socket found")
else:
raise errors.HypervisorError(
"Error checking monitor socket: %s", utils.ErrnoOrStr(err))
def _check_socket(self):
sock_stat = None
try:
sock_stat = os.stat(self.monitor_filename)
except EnvironmentError as err:
if err.errno == errno.ENOENT:
raise errors.HypervisorError("No monitor socket found")
else:
raise errors.HypervisorError(
"Error checking monitor socket: %s", utils.ErrnoOrStr(err))
if not stat.S_ISSOCK(sock_stat.st_mode):
raise errors.HypervisorError("Monitor socket is not a socket")
def BalloonInstanceMemory(self, instance, mem):
"""Balloon an instance memory to a certain value.
@type instance: L{objects.Instance}
@param instance: instance to be accepted
@type mem: int
@param mem: actual memory size to use for instance runtime
"""
if not self._IsAlive(instance.name):
raise errors.HypervisorError(
"Failed to balloon memory for %s: %s" %
(instance.name, "not running"))
try:
self._MarkUp(instance, mem)
except EnvironmentError, err:
raise errors.HypervisorError(
"Failed to balloon memory for %s: %s" %
(instance.name, utils.ErrnoOrStr(err)))
def _CheckExtStorageFile(base_dir, filename):
"""Check prereqs for an ExtStorage file.
Check if file exists, if it is a regular file and in case it is
one of extstorage scripts if it is executable.
@type base_dir: string
@param base_dir: Base directory containing ExtStorage installations.
@type filename: string
@param filename: The basename of the ExtStorage file.
@raises BlockDeviceError: In case prereqs are not met.
"""
file_path = utils.PathJoin(base_dir, filename)
try:
st = os.stat(file_path)
except EnvironmentError, err:
base.ThrowError("File '%s' under path '%s' is missing (%s)" %
(filename, base_dir, utils.ErrnoOrStr(err)))
# script or None, depending on the corresponding checks. See the
# function's docstrings for more on these checks.
es_files[filename] = _CheckExtStorageFile(es_dir, filename,
required)
except errors.BlockDeviceError, err:
return False, str(err)
parameters = []
if constants.ES_PARAMETERS_FILE in es_files:
parameters_file = es_files[constants.ES_PARAMETERS_FILE]
try:
parameters = utils.ReadFile(parameters_file).splitlines()
except EnvironmentError, err:
return False, (
"Error while reading the EXT parameters file at %s: %s" %
(parameters_file, utils.ErrnoOrStr(err)))
parameters = [v.split(None, 1) for v in parameters]
es_obj = \
objects.ExtStorage(name=name, path=es_dir,
create_script=es_files[constants.ES_SCRIPT_CREATE],
remove_script=es_files[constants.ES_SCRIPT_REMOVE],
grow_script=es_files[constants.ES_SCRIPT_GROW],
attach_script=es_files[constants.ES_SCRIPT_ATTACH],
detach_script=es_files[constants.ES_SCRIPT_DETACH],
setinfo_script=es_files[constants.ES_SCRIPT_SETINFO],
verify_script=es_files[constants.ES_SCRIPT_VERIFY],
snapshot_script=es_files[constants.ES_SCRIPT_SNAPSHOT],
open_script=es_files[constants.ES_SCRIPT_OPEN],
close_script=es_files[constants.ES_SCRIPT_CLOSE],
supported_parameters=parameters)
def ExtStorageFromDisk(name, base_dir=None):
"""Create an ExtStorage instance from disk.
This function will return an ExtStorage instance
if the given name is a valid ExtStorage name.
@type base_dir: string
@keyword base_dir: Base directory containing ExtStorage installations.
Defaults to a search in all the ES_SEARCH_PATH dirs.
@rtype: tuple
@return: True and the ExtStorage instance if we find a valid one, or
False and the diagnose message on error
"""
if base_dir is None:
es_base_dir = pathutils.ES_SEARCH_PATH
else:
es_base_dir = [base_dir]
es_dir = utils.FindFile(name, es_base_dir, os.path.isdir)
if es_dir is None:
return False, ("Directory for External Storage Provider %s not"
" found in search path" % name)
# ES Files dictionary: this will be populated later with the absolute path
# names for each script; currently we denote for each script if it is
# required (True) or optional (False)
es_files = dict.fromkeys(constants.ES_SCRIPTS, True)
# Let the snapshot, open, and close scripts be optional
# for backwards compatibility
es_files[constants.ES_SCRIPT_SNAPSHOT] = False
es_files[constants.ES_SCRIPT_OPEN] = False
es_files[constants.ES_SCRIPT_CLOSE] = False
es_files[constants.ES_PARAMETERS_FILE] = True
for (filename, required) in es_files.items():
try:
# Here we actually fill the dict with the ablsolute path name for each
# script or None, depending on the corresponding checks. See the
# function's docstrings for more on these checks.
es_files[filename] = _CheckExtStorageFile(es_dir, filename, required)
except errors.BlockDeviceError as err:
return False, str(err)
parameters = []
if constants.ES_PARAMETERS_FILE in es_files:
parameters_file = es_files[constants.ES_PARAMETERS_FILE]
try:
parameters = utils.ReadFile(parameters_file).splitlines()
except EnvironmentError as err:
return False, ("Error while reading the EXT parameters file at %s: %s" %
(parameters_file, utils.ErrnoOrStr(err)))
parameters = [v.split(None, 1) for v in parameters]
es_obj = \
objects.ExtStorage(name=name, path=es_dir,
create_script=es_files[constants.ES_SCRIPT_CREATE],
remove_script=es_files[constants.ES_SCRIPT_REMOVE],
grow_script=es_files[constants.ES_SCRIPT_GROW],
attach_script=es_files[constants.ES_SCRIPT_ATTACH],
detach_script=es_files[constants.ES_SCRIPT_DETACH],
setinfo_script=es_files[constants.ES_SCRIPT_SETINFO],
verify_script=es_files[constants.ES_SCRIPT_VERIFY],
snapshot_script=es_files[constants.ES_SCRIPT_SNAPSHOT],
open_script=es_files[constants.ES_SCRIPT_OPEN],
close_script=es_files[constants.ES_SCRIPT_CLOSE],
supported_parameters=parameters)
return True, es_obj
