141 lines
5.1 KiB
Python
141 lines
5.1 KiB
Python
import copy
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import math
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import re
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import subprocess
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##
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import mdstat
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##
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from aif.disk.block import Disk
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from aif.disk.block import Partition
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SUPPORTED_LEVELS = (0, 1, 4, 5, 6)
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SUPPORTED_METADATA = ('0', '0.90', '1', '1.0', '1.1', '1.2', 'default', 'ddf', 'imsm')
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SUPPORTED_LAYOUTS = {5: (re.compile(r'^((left|right)-a?symmetric|[lr][as]|'
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r'parity-(fir|la)st|'
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r'ddf-(N|zero)-restart|ddf-N-continue)$'),
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'left-symmetric'),
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6: (re.compile(r'^((left|right)-a?symmetric(-6)?|[lr][as]|'
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r'parity-(fir|la)st|'
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r'ddf-(N|zero)-restart|ddf-N-continue|'
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r'parity-first-6)$'),
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None),
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10: (re.compile(r'^[nof][0-9]+$'),
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None)}
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def _itTakesTwo(n):
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# So dumb.
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isPowerOf2 = math.ceil(math.log(n, 2)) == math.floor(math.log(n, 2))
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return(isPowerOf2)
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def _safeChunks(n):
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if (n % 4) != 0:
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return(False)
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return(True)
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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, (Partition, Disk, Array)):
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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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def prepare(self):
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# TODO: logging
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subprocess.run(['mdadm', '--misc', '--zero-superblock', self.devpath])
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return()
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class Array(object):
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def __init__(self, array_xml, homehost):
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self.xml = array_xml
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self.id = array_xml.attrib['id']
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self.level = int(self.xml.attrib['level'])
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if self.level not in SUPPORTED_LEVELS:
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raise ValueError('RAID level must be one of: {0}'.format(', '.join([str(i) for i in SUPPORTED_LEVELS])))
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self.metadata = self.xml.attrib.get('meta', '1.2')
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if self.metadata not in SUPPORTED_METADATA:
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raise ValueError('Metadata version must be one of: {0}'.format(', '.join(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 _itTakesTwo(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 _safeChunks(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 SUPPORTED_LAYOUTS.keys():
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matcher, layout_default = 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.devname = self.xml.attrib['name']
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self.devpath = '/dev/md/{0}'.format(self.devname)
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self.updateStatus()
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self.members = []
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self.state = 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()
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def assemble(self, scan = False):
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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.extend([''])
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# TODO: logging!
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subprocess.run(cmd)
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pass
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return()
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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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'--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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'--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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pass
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return()
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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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return()
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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.devname:
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del(_info['devices'][k])
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self.info = copy.deepcopy(_info)
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return()
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def writeConf(self, conf = '/etc/mdadm.conf'):
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pass
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