"""
dmsetup commands - Command ``dmsetup``
======================================
Parsers for parsing and extracting data from output of commands related to
``dmsetup``.
Parsers contained in this module are:
DmsetupInfo - command ``dmsetup info -C``
-----------------------------------------
DmsetupStatus - command ``dmsetup status``
------------------------------------------
"""
from collections import namedtuple
from insights import parser, CommandParser
from insights.parsers import parse_delimited_table
from insights.parsers import ParseException
from insights.specs import Specs
SetupInfo = namedtuple('SetupInfo', [
'name', 'major', 'minor', 'open', 'segments', 'events',
'live_table', 'inactive_table', 'suspended', 'readonly', 'uuid']
)
""" Data structure to represent dmsetup information """
SetupStatus = namedtuple('SetupStatus', [
'device_name', 'start_sector', 'num_sectors', 'target_type',
'target_args', 'parsed_args']
)
""" Data structure to represent dmsetup status """
[docs]@parser(Specs.dmsetup_info)
class DmsetupInfo(CommandParser):
"""
``dmsetup info -C`` command output
Example input::
Name Maj Min Stat Open Targ Event UUID
VG00-tmp 253 8 L--w 1 1 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTax6lLmBji2ueSbX49gxcV76M29cmukQiw4
VG00-home 253 3 L--w 1 1 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTaxCqXOnbGe2zjhX923dFiIdl1oi7mO9tXp
VG00-var 253 6 L--w 1 2 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTaxicvyvt67113nTb8vMlGfgdEjDx0LKT2O
VG00-swap 253 1 L--w 2 1 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTax3Ll2XhOYZkylx1CjOQi7G4yHgrIOsyqG
VG00-root 253 0 L--w 1 1 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTaxKpnAKYhrYMYMNMwjegkW965bUgtJFTRY
VG00-var_log_audit 253 5 L--w 1 1 0 LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTaxwQ8R0XWJRm86QX3befq1cHRy47Von6ZW
Example data structure produced::
data = [
{
'Stat': 'L--w',
'Name': 'VG00-tmp',
'Min': '8',
'Targ': '1',
'Maj': '253',
'Open': '1',
'Event': '0',
'UUID': 'LVM-gy9uAwD7LuTIApplr2sogbOx5iS0FTax6lLmBji2ueSbX49gxcV76M29cmukQiw4'
},...
]
Attributes:
data (list): List of devices found, in order
names (list): Device names, in order found
uuids (list): UUID
by_name (dict): Access to each device by devicename
by_uuid (dict): Access to each device by uuid
info (list): List of devices found, in order using SetupInfo structure
Example:
>>> len(setup_info)
6
>>> setup_info.names[0]
'VG00-tmp'
>>> setup_info[1]['Maj']
'253'
>>> setup_info[1]['Stat']
'L--w'
>>> setup_info.info[-1].name
'VG00-var_log_audit'
>>> setup_info.info[-1].major
253
>>> setup_info.info[-1].live_table
True
>>> setup_info.info[-1].readonly
False
"""
[docs] def parse_content(self, content):
self.data = parse_delimited_table(content)
self.names = [dm['Name'] for dm in self.data if 'Name' in dm]
self.by_name = dict((dm['Name'], dm) for dm in self.data if 'Name' in dm)
self.uuids = [dm['UUID'] for dm in self.data if 'UUID' in dm]
self.by_uuid = dict((dm['UUID'], dm) for dm in self.data if 'UUID' in dm)
self.info = []
for dm in self.data:
self.info.append(SetupInfo(
name=dm.get('Name'),
major=int(dm.get('Maj')) if 'Maj' in dm and dm.get('Maj').isdigit() else None,
minor=int(dm.get('Min')) if 'Min' in dm and dm.get('Min').isdigit() else None,
open=int(dm.get('Open')) if 'Open' in dm and dm.get('Open').isdigit() else None,
segments=int(dm.get('Targ')) if 'Targ' in dm and dm.get('Targ').isdigit() else None,
events=int(dm.get('Event')) if 'Event' in dm and dm.get('Event').isdigit() else None,
live_table=dm.get('Stat', '----')[0] == 'L',
inactive_table=dm.get('Stat', '----')[1] == 'I',
suspended=dm.get('Stat', '----')[2] == 's',
readonly=dm.get('Stat', '----')[3] == 'r',
uuid=dm.get('UUID')
))
def __len__(self):
"""
The length of the devices list
"""
return len(self.data)
def __iter__(self):
"""
Iterate through the devices list
"""
for dm in self.data:
yield dm
def __getitem__(self, idx):
"""
Fetch a device by index in devices list
"""
return self.data[idx]
[docs]@parser(Specs.dmsetup_status)
class DmsetupStatus(CommandParser, list):
"""
``dmsetup status -C`` command output
Example input::
rootvg-tanlv: 0 6291456 linear
rootvg-ssnap: 0 16384000 snapshot 1560768/5120000 6088
rootvg-optvolapp: 0 8192000 snapshot-origin
docker-253:10-1234567-0df13579: 0 20971520 thin 1922048 20971519
docker-253:10-4254621-0496628a: 0 20971520 thin 1951744 20971519
docker-253:10-4254621-d392682f: 0 20971520 thin 7106560 20971519
rootvg-docker--pool: 0 129548288 thin-pool 1 20/49152 38/126512 - rw no_discard_passdown queue_if_no_space -
rootvg-tmpvol: 0 2048000 linear
rootvg-varvol: 0 18874368 snapshot Invalid
rootvg-optvol: 0 8192000 snapshot 616408/5120000 2408
rootvg-varvol-cow: 0 5120000 linear
appsvg-lvapps_docker: 0 104857600 thin-pool 441 697/2048 20663/102400 - rw no_discard_passdown queue_if_no_space -
Example data structure produced::
[
SetupStatus(
device_name='rootvg-tanlv', start_sector='0',
num_sectors='6291456', target_type='linear',
target_args=None, parsed_args=None,
), ...
]
Attributes:
names (list): Device names, in order found
by_name (dict): Access to each device by devicename
unparseable_lines (list): Unparseable raw lines
Example:
>>> len(dmsetup_status)
12
>>> dmsetup_status.names[0]
'rootvg-tanlv'
>>> dmsetup_status[1].target_type
'snapshot'
>>> dmsetup_status[1].start_sector
'0'
>>> len(dmsetup_status.by_name)
12
>>> dmsetup_status[-1].parsed_args['used_metadata_blocks']
'697'
>>> dmsetup_status[-1].parsed_args['total_metadata_blocks']
'2048'
>>> dmsetup_status[-1].parsed_args['opts']
['rw', 'no_discard_passdown', 'queue_if_no_space', '-']
"""
[docs] def parse_content(self, content):
self.unparseable_lines = []
if content[0].lower() == "no devices found":
return
for line in content:
_device_name, _device_info_str = line.rsplit(':', 1)
device_name = _device_name.strip()
device_info_spl = _device_info_str.strip().split(' ', 3)
if len(device_info_spl) < 3:
self.unparseable_lines.append(line)
continue
target_type = device_info_spl[2]
target_args = device_info_spl[3] if len(device_info_spl) == 4 else None
parsed_args = None
if target_args:
try:
parsed_args = self._parse_target_args(target_type, target_args)
except ParseException:
self.unparseable_lines.append(line)
self.append(SetupStatus(
device_name=device_name,
start_sector=device_info_spl[0],
num_sectors=device_info_spl[1],
target_type=target_type,
target_args=target_args,
parsed_args=parsed_args,
))
@property
def names(self):
return [dm[0] for dm in self]
@property
def by_name(self):
return dict((dm[0], dm) for dm in self)
def _parse_target_args(self, target_type, target_args):
pars_func_name = '_parse_target_args_' + target_type.replace('-', '_')
pars_func = getattr(self, pars_func_name, None)
return pars_func(target_args) if pars_func else None
def _parse_target_args_thin_pool(self, target_args):
"""
Format:
<transaction_id> <used_metadata_blocks>/<total_metadata_blocks>
<used_data_blocks>/<total_data_blocks> <held_metadata_root>
ro|rw|out_of_data_space [no_]discard_passdown [error|queue]_if_no_space
needs_check|- metadata_low_watermark
Refer to https://www.kernel.org/doc/Documentation/device-mapper/thin-provisioning.txt .
"""
args = target_args.split()
if len(args) < 8 or '/' not in args[1] or '/' not in args[2]:
raise ParseException("Invalid thin_pool target_args: {0}".format(target_args))
parsed_args = {}
parsed_args['transaction_id'] = args[0]
parsed_args['used_metadata_blocks'], parsed_args['total_metadata_blocks'] = args[1].split('/', 1)
parsed_args['used_data_blocks'], parsed_args['total_data_blocks'] = args[2].split('/', 1)
parsed_args['held_metadata_root'] = args[3]
parsed_args['opts'] = args[4:8]
parsed_args['metadata_low_watermark'] = args[8] if len(args) > 8 else None
return parsed_args
def _parse_target_args_thin(self, target_args):
"""
Format:
<nr_mapped_sectors> <highest_mapped_sector>
Refer to https://www.kernel.org/doc/Documentation/device-mapper/thin-provisioning.txt .
"""
args = target_args.split()
if len(args) < 2:
raise ParseException("Invalid thin target_args: {0}".format(target_args))
parsed_args = {}
parsed_args['nr_mapped_sectors'] = args[0]
parsed_args['highest_mapped_sector'] = args[1]
return parsed_args
def _parse_target_args_snapshot(self, target_args):
"""
Format:
<sectors_allocated>/<total_sectors> <metadata_sectors>
Refer to https://www.kernel.org/doc/Documentation/device-mapper/snapshot.txt .
"""
args = target_args.split()
if len(args) < 2 or '/' not in args[0]:
raise ParseException("Invalid snapshot target_args: {0}".format(target_args))
parsed_args = {}
parsed_args['sectors_allocated'], parsed_args['total_sectors'] = args[0].split('/', 1)
parsed_args['metadata_sectors'] = args[1]
return parsed_args