256 lines
11 KiB
Python
256 lines
11 KiB
Python
import copy
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import datetime
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import logging
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import os
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import re
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import subprocess
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import uuid
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##
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import mdstat
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from lxml import etree
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##
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import aif.disk.block_fallback as block
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import aif.disk.luks_fallback as luks
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import aif.disk.lvm_fallback as lvm
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import aif.utils
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import aif.constants
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_mdblock_size_re = re.compile(r'^(?P<sectors>[0-9]+)\s+'
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r'\((?P<GiB>[0-9.]+)\s+GiB\s+'
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r'(?P<GB>[0-9.]+)\s+GB\)')
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_mdblock_unused_re = re.compile(r'^before=(?P<before>[0-9]+)\s+sectors,'
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r'\s+after=(?P<after>[0-9]+)\s+sectors$')
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_mdblock_badblock_re = re.compile(r'^(?P<entries>[0-9]+)\s+entries'
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r'[A-Za-z\s]+'
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r'(?P<offset>[0-9]+)\s+sectors$')
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class Member(object):
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def __init__(self, member_xml, partobj):
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self.xml = member_xml
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self.device = partobj
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if not isinstance(self.device, (block.Partition,
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block.Disk,
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Array,
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lvm.LV,
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luks.LUKS)):
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raise ValueError(('partobj must be of type aif.disk.block.Partition, '
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'aif.disk.block.Disk, or aif.disk.mdadm.Array'))
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self.devpath = self.device.devpath
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self.is_superblocked = None
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self.superblock = None
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self._parseDeviceBlock()
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def _parseDeviceBlock(self):
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# I can't believe the mdstat module doesn't really have a way to do this.
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_super = subprocess.run(['mdadm', '--examine', self.devpath],
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stdout = subprocess.PIPE,
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stderr = subprocess.PIPE)
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if _super.returncode != 0:
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# TODO: logging?
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self.is_superblocked = False
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self.superblock = None
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return(None)
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block = {}
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for idx, line in enumerate(super.stdout.decode('utf-8').splitlines()):
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line = line.strip()
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if idx == 0: # This is just the same as self.device.devpath.
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continue
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if line == '':
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continue
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k, v = [i.strip() for i in line.split(':', 1)]
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orig_k = k
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k = re.sub(r'\s+', '_', k.lower())
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if k in ('raid_devices', 'events'):
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v = int(v)
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elif k == 'magic':
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v = bytes.fromhex(v)
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elif k == 'name':
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# TODO: Will this *always* give 2 values?
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name, local_to = [i.strip() for i in v.split(None, 1)]
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local_to = re.sub(r'[()]', '', local_to)
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v = (name, local_to)
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elif k == 'raid_level':
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v = int(re.sub(r'^raid', '', v))
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elif k == 'checksum':
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cksum, status = [i.strip() for i in v.split('-')]
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v = (bytes.fromhex(cksum), status)
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elif k == 'unused_space':
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r = _mdblock_unused_re.search(v)
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if not r:
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raise ValueError(('Could not parse {0} for '
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'{1}\'s superblock').format(orig_k,
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self.devpath))
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v = {}
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for i in ('before', 'after'):
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v[i] = int(r.group(i)) # in sectors
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elif k == 'bad_block_log':
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k = 'badblock_log_entries'
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r = _mdblock_badblock_re.search(v)
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if not r:
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raise ValueError(('Could not parse {0} for '
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'{1}\'s superblock').format(orig_k,
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self.devpath))
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v = {}
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for i in ('entries', 'offset'):
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v[i] = int(r.group(i)) # offset is in sectors
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elif k == 'array_state':
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v = [i.strip() for i in v.split(None, 1)][0].split()
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elif k == 'device_uuid':
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v = uuid.UUID(hex = v.replace(':', '-'))
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elif re.search((r'^(creation|update)_time$'), k):
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# TODO: Is this portable/correct? Or do I need to do '%a %b %d %H:%M:%s %Y'?
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v = datetime.datetime.strptime(v, '%c')
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elif re.search(r'^((avail|used)_dev|array)_size$', k):
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r = _mdblock_size_re.search(v)
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if not r:
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raise ValueError(('Could not parse {0} for '
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'{1}\'s superblock').format(orig_k,
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self.devpath))
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v = {}
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for i in ('sectors', 'GB', 'GiB'):
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v[i] = float(r.group(i))
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if i == 'sectors':
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v[i] = int(v[i])
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elif re.search(r'^(data|super)_offset$', k):
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v = int(v.split(None, 1)[0])
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block[k] = v
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self.superblock = block
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self.is_superblocked = True
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return(None)
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def prepare(self):
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if self.is_superblocked:
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# TODO: logging
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subprocess.run(['mdadm', '--misc', '--zero-superblock', self.devpath])
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self.is_superblocked = False
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self._parseDeviceBlock()
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return(None)
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class Array(object):
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def __init__(self, array_xml, homehost, devpath = None):
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self.xml = array_xml
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self.id = self.xml.attrib['id']
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self.level = int(self.xml.attrib['level'])
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if self.level not in aif.constants.MDADM_SUPPORTED_LEVELS:
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raise ValueError('RAID level must be one of: {0}'.format(', '.join([str(i)
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for i in
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aif.constants.MDADM_SUPPORTED_LEVELS])))
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self.metadata = self.xml.attrib.get('meta', '1.2')
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if self.metadata not in aif.constants.MDADM_SUPPORTED_METADATA:
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raise ValueError('Metadata version must be one of: {0}'.format(', '.join(
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aif.constants.MDADM_SUPPORTED_METADATA)))
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self.chunksize = int(self.xml.attrib.get('chunkSize', 512))
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if self.level in (4, 5, 6, 10):
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if not aif.utils.isPowerofTwo(self.chunksize):
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# TODO: log.warn instead of raise exception? Will mdadm lose its marbles if it *isn't* a proper number?
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raise ValueError('chunksize must be a power of 2 for the RAID level you specified')
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if self.level in (0, 4, 5, 6, 10):
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if not aif.utils.hasSafeChunks(self.chunksize):
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# TODO: log.warn instead of raise exception? Will mdadm lose its marbles if it *isn't* a proper number?
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raise ValueError('chunksize must be divisible by 4 for the RAID level you specified')
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self.layout = self.xml.attrib.get('layout', 'none')
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if self.level in aif.constants.MDADM_SUPPORTED_LAYOUTS.keys():
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matcher, layout_default = aif.constants.MDADM_SUPPORTED_LAYOUTS[self.level]
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if not matcher.search(self.layout):
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if layout_default:
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self.layout = layout_default
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else:
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self.layout = None # TODO: log.warn?
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else:
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self.layout = None
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self.name = self.xml.attrib['name']
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self.devpath = devpath
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if not self.devpath:
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self.devpath = '/dev/md/{0}'.format(self.name)
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self.updateStatus()
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self.homehost = homehost
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self.members = []
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self.state = None
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self.info = None
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def addMember(self, memberobj):
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if not isinstance(memberobj, Member):
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raise ValueError('memberobj must be of type aif.disk.mdadm.Member')
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memberobj.prepare()
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self.members.append(memberobj)
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return(None)
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def create(self):
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if not self.members:
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raise RuntimeError('Cannot create an array with no members')
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cmd = ['mdadm', '--create',
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'--name={0}'.format(self.name),
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'--bitmap=internal',
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'--level={0}'.format(self.level),
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'--metadata={0}'.format(self.metadata),
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'--chunk={0}'.format(self.chunksize),
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'--homehost={0}'.format(self.homehost),
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'--raid-devices={0}'.format(len(self.members))]
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if self.layout:
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cmd.append('--layout={0}'.format(self.layout))
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cmd.append(self.devpath)
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for m in self.members:
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cmd.append(m.devpath)
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# TODO: logging!
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subprocess.run(cmd)
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for m in self.members:
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m._parseDeviceBlock()
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self.updateStatus()
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self.writeConf()
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self.state = 'new'
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return(None)
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def start(self, scan = False):
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if not any((self.members, self.devpath)):
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raise RuntimeError('Cannot assemble an array with no members (for hints) or device path')
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cmd = ['mdadm', '--assemble', self.devpath]
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if not scan:
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for m in self.members:
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cmd.append(m.devpath)
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else:
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cmd.append('--scan')
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# TODO: logging!
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subprocess.run(cmd)
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self.updateStatus()
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self.state = 'assembled'
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return(None)
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def stop(self):
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# TODO: logging
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subprocess.run(['mdadm', '--stop', self.devpath])
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self.state = 'disassembled'
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return(None)
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def updateStatus(self):
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_info = mdstat.parse()
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for k, v in _info['devices'].items():
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if k != self.name:
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del(_info['devices'][k])
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self.info = copy.deepcopy(_info)
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return(None)
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def writeConf(self, conf = '/etc/mdadm.conf'):
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conf = os.path.realpath(conf)
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with open(conf, 'r') as fh:
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conflines = fh.read().splitlines()
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# TODO: logging
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arrayinfo = subprocess.run(['mdadm', '--detail', '--brief', self.devpath],
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stdout = subprocess.PIPE).stdout.decode('utf-8').strip()
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if arrayinfo not in conflines:
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r = re.compile(r'^ARRAY\s+{0}'.format(self.devpath))
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nodev = True
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for l in conflines:
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if r.search(l):
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nodev = False
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# TODO: logging?
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# and/or Raise an exception here;
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# an array already exists with that name but not with the same opts/GUID/etc.
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break
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if nodev:
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with open(conf, 'a') as fh:
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fh.write('{0}\n'.format(arrayinfo))
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return(None)
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