aif-ng/aif/disk/lvm_fallback.py
2019-11-08 05:19:28 -05:00

334 lines
13 KiB
Python

import datetime
import json
import subprocess
##
import aif.utils
import aif.disk.block_fallback as block
import aif.disk.luks_fallback as luks
import aif.disk.mdadm_fallback as mdadm
class PV(object):
def __init__(self, pv_xml, partobj):
self.xml = pv_xml
self.id = self.xml.attrib('id')
self.source = self.xml.attrib('source')
self.device = partobj
if not isinstance(self.device, (block.Disk,
block.Partition,
luks.LUKS,
mdadm.Array)):
raise ValueError(('partobj must be of type '
'aif.disk.block.Disk, '
'aif.disk.block.Partition, '
'aif.disk.luks.LUKS, or'
'aif.disk.mdadm.Array'))
self.devpath = self.device.devpath
self.is_pooled = False
self.meta = None
self._parseMeta()
def _parseMeta(self):
# Note, the "UUID" for LVM is *not* a true UUID (RFC4122) so we don't convert it.
# https://unix.stackexchange.com/questions/173722/what-is-the-uuid-format-used-by-lvm
meta = {}
cmd = ['pvs',
'--binary',
'--nosuffix',
'--units', 'b',
'--options', '+pvall',
'--reportformat', 'json',
self.devpath]
_meta = subprocess.run(cmd, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
if _meta.returncode != 0:
self.meta = None
self.is_pooled = False
return()
_meta = json.loads(_meta.stdout.decode('utf-8'))['report'][0]['pv'][0]
for k, v in _meta.items():
# We *could* regex this but the pattern would be a little more complex than idea,
# especially for such predictable strings.
# These are ints.
if k in ('dev_size', 'pe_start', 'pv_ba_size', 'pv_ba_start', 'pv_ext_vsn', 'pv_free', 'pv_major',
'pv_mda_count', 'pv_mda_free', 'pv_mda_size', 'pv_mda_used_count', 'pv_minor', 'pv_pe_alloc_count',
'pv_pe_alloc_count', 'pv_size', 'pv_used'):
v = int(v)
# These are boolean.
elif k in ('pv_allocatable', 'pv_duplicate', 'pv_exported', 'pv_in_use', 'pv_missing'):
v = (True if int(v) == 1 else False)
# This is a list.
elif k == 'pv_tags':
v = [i.strip() for i in v.split(',') if i.strip() != '']
elif v.strip() == '':
v = None
meta[k] = v
self.meta = meta
self.is_pooled = True
return()
def prepare(self):
if not self.meta:
self._parseMeta()
# *Technically*, we should vgreduce before pvremove, but eff it.
cmd = ['pvremove',
'--force', '--force',
'--reportformat', 'json',
self.devpath]
subprocess.run(cmd)
cmd = ['pvcreate',
'--reportformat', 'json',
self.devpath]
subprocess.run(cmd)
self._parseMeta()
return()
class VG(object):
def __init__(self, vg_xml):
self.xml = vg_xml
self.id = self.xml.attrib('id')
self.name = self.xml.attrib('name')
self.pe_size = self.xml.attrib.get('extentSize', 0)
if self.pe_size:
x = dict(zip(('from_bgn', 'size', 'type'),
aif.utils.convertSizeUnit(self.pe_size)))
if x['type']:
self.pe_size = aif.utils.size.convertStorage(self.pe_size,
x['type'],
target = 'B')
if not aif.utils.isPowerofTwo(self.pe_size):
raise ValueError('The PE size must be a power of two (in bytes)')
self.lvs = []
self.pvs = []
# self.tags = []
# for te in self.xml.findall('tags/tag'):
# self.tags.append(te.text)
self.devpath = None
self.devpath = self.name
self.info = None
self.created = False
def addPV(self, pvobj):
if not isinstance(pvobj, PV):
raise ValueError('pvobj must be of type aif.disk.lvm.PV')
pvobj.prepare()
self.pvs.append(pvobj)
return()
def create(self):
if not self.pvs:
raise RuntimeError('Cannot create a VG with no PVs')
cmd = ['vgcreate',
'--reportformat', 'json',
'--physicalextentsize', '{0}b'.format(self.pe_size),
self.name]
for pv in self.pvs:
cmd.append(pv.devpath)
subprocess.run(cmd)
for pv in self.pvs:
pv._parseMeta()
self.created = True
self.updateInfo()
return()
def createLV(self, lv_xml = None):
if not self.created:
raise RuntimeError('VG must be created before LVs can be added')
# If lv_xml is None, we loop through our own XML.
if lv_xml:
lv = LV(lv_xml, self)
lv.create()
# self.lvs.append(lv)
else:
for le in self.xml.findall('logicalVolumes/lv'):
lv = LV(le, self)
lv.create()
# self.lvs.append(lv)
self.updateInfo()
return()
def start(self):
cmd = ['vgchange',
'--activate', 'y',
'--reportformat', 'json',
self.name]
subprocess.run(cmd)
self.updateInfo()
return()
def stop(self):
cmd = ['vgchange',
'--activate', 'n',
'--reportformat', 'json',
self.name]
subprocess.run(cmd)
self.updateInfo()
return()
def updateInfo(self):
info = {}
cmd = ['vgs',
'--binary',
'--nosuffix',
'--units', 'b',
'--options', '+vgall',
'--reportformat', 'json',
self.name]
_info = subprocess.run(cmd, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
if _info.returncode != 0:
self.info = None
self.created = False
return()
_info = json.loads(_info.stdout.decode('utf-8'))['report'][0]['vg'][0]
for k, v in _info.items():
# ints
if k in ('lv_count', 'max_lv', 'max_pv', 'pv_count', 'snap_count', 'vg_extent_count', 'vg_extent_size',
'vg_free', 'vg_free_count', 'vg_mda_count', 'vg_mda_free', 'vg_mda_size', 'vg_mda_used_count',
'vg_missing_pv_count', 'vg_seqno', 'vg_size'):
v = int(v)
# booleans
elif k in ('vg_clustered', 'vg_exported', 'vg_extendable', 'vg_partial', 'vg_shared'):
v = (True if int(v) == 1 else False)
# lists
elif k in ('vg_lock_args', 'vg_permissions', 'vg_tags'): # not 100% sure about vg_permissions...
v = [i.strip() for i in v.split(',') if i.strip() != '']
elif v.strip() == '':
v = None
info[k] = v
self.info = info
return()
class LV(object):
def __init__(self, lv_xml, vgobj):
self.xml = lv_xml
self.id = self.xml.attrib('id')
self.name = self.xml.attrib('name')
self.vg = vgobj
self.qualified_name = '{0}/{1}'.format(self.vg.name, self.name)
self.pvs = []
if not isinstance(self.vg, VG):
raise ValueError('vgobj must be of type aif.disk.lvm.VG')
self.info = None
self.devpath = '/dev/{0}/{1}'.format(self.vg.name, self.name)
self.created = False
self.updateInfo()
self._initLV()
def _initLV(self):
self.pvs = []
_indexed_pvs = {i.id: i for i in self.vg.pvs}
for pe in self.xml.findall('pvMember'):
pv_id = pe.attrib('source')
if pv_id in _indexed_pvs.keys():
self.pvs.append(_indexed_pvs[pv_id])
if not self.pvs: # We get all in the VG instead since none were explicitly assigned
self.pvs = self.vg.pvs
# Size processing. We have to do this after indexing PVs.
# If not x['type'], assume *extents*, not sectors
self.size = self.xml.attrib('size') # Convert to bytes. Can get max from _BlockDev.lvm.vginfo(<VG>).free TODO
x = dict(zip(('from_bgn', 'size', 'type'),
aif.utils.convertSizeUnit(self.xml.attrib['size'])))
# self.size is bytes
self.size = x['size']
_extents = {'size': self.vg.info['extent_size'],
'total': 0} # We can't use self.vg.info['extent_count'] because selective PVs.
_sizes = {'total': 0,
'free': 0}
_vg_pe = self.vg.info['extent_size']
for pv in self.pvs:
_sizes['total'] += pv.info['pv_size']
_sizes['free'] += pv.info['pv_free']
_extents['total'] += int(pv.info['pv_size'] / _extents['size'])
if x['type'] == '%':
self.size = int(_sizes['total'] * (0.01 * self.size))
elif x['type'] is None:
self.size = int(self.size * _extents['size'])
else:
self.size = int(aif.utils.size.convertStorage(x['size'],
x['type'],
target = 'B'))
if self.size >= _sizes['total']:
self.size = 0
return()
def create(self):
if not self.pvs:
raise RuntimeError('Cannot create LV with no associated LVs')
cmd = ['lvcreate',
'--reportformat', 'json']
if self.size > 0:
cmd.extend(['--size', self.size])
elif self.size == 0:
cmd.extend(['--extents', '100%FREE'])
cmd.extend([self.name,
self.vg.name])
self.vg.lvs.append(self)
self.created = True
self.updateInfo()
self.vg.updateInfo()
return()
def start(self):
cmd = ['lvchange',
'--activate', 'y',
'--reportformat', 'json',
self.qualified_name]
subprocess.run(cmd)
self.updateInfo()
return()
def stop(self):
cmd = ['lvchange',
'--activate', 'n',
'--reportformat', 'json',
self.qualified_name]
subprocess.run(cmd)
self.updateInfo()
return()
def updateInfo(self):
info = {}
cmd = ['lvs',
'--binary',
'--nosuffix',
'--units', 'b',
'--options', '+lvall',
'--reportformat', 'json',
self.qualified_name]
_info = subprocess.run(cmd, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
if _info.returncode != 0:
self.info = None
self.created = False
return()
_info = json.loads(_info.stdout.decode('utf-8'))['report'][0]['vg'][0]
for k, v in _info.items():
# ints
if k in ('lv_fixed_minor', 'lv_kernel_major', 'lv_kernel_minor', 'lv_kernel_read_ahead', 'lv_major',
'lv_metadata_size', 'lv_minor', 'lv_size', 'seg_count'):
try:
v = int(v)
except ValueError:
v = 0
# booleans - LVs apparently have a third value, "-1", which is "unknown". We translate to None.
elif k in ('lv_active_exclusively', 'lv_active_locally', 'lv_active_remotely', 'lv_allocation_locked',
'lv_check_needed', 'lv_converting', 'lv_device_open', 'lv_historical', 'lv_image_synced',
'lv_inactive_table', 'lv_initial_image_sync', 'lv_live_table', 'lv_merge_failed', 'lv_merging',
'lv_skip_activation', 'lv_snapshot_invalid', 'lv_suspended'):
if v == '-1':
v = None
else:
v = (True if int(v) == 1 else False)
# lists
elif k in ('lv_ancestors', 'lv_descendants', 'lv_full_ancestors', 'lv_full_descendants', 'lv_lockargs',
'lv_modules', 'lv_permissions', 'lv_tags'):
v = [i.strip() for i in v.split(',') if i.strip() != '']
# date time strings
elif k in ('lv_time', ):
v = datetime.datetime.strptime(v, '%Y-%m-%d %H:%M:%S %z')
elif v.strip() == '':
v = None
info[k] = v
self.info = info
return()