193 lines
6.9 KiB
Python
193 lines
6.9 KiB
Python
import uuid
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##
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from . import _common
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import aif.disk.block as block
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import aif.disk.luks as luks
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import aif.disk.mdadm as mdadm
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_BlockDev = _common.BlockDev
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class PV(object):
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def __init__(self, pv_xml, partobj):
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self.xml = pv_xml
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self.id = self.xml.attrib('id')
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self.source = self.xml.attrib('source')
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self.device = partobj
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if not isinstance(self.device, (block.Disk,
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block.Partition,
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luks.LUKS,
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mdadm.Array)):
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raise ValueError(('partobj must be of type '
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'aif.disk.block.Disk, '
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'aif.disk.block.Partition, '
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'aif.disk.luks.LUKS, or'
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'aif.disk.mdadm.Array'))
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_common.addBDPlugin('lvm')
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self.devpath = self.device.devpath
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self.is_pooled = False
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self.meta = None
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self._parseMeta()
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def _parseMeta(self):
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# Note, the "UUID" for LVM is *not* a true UUID (RFC4122) so we don't convert it.
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# https://unix.stackexchange.com/questions/173722/what-is-the-uuid-format-used-by-lvm
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# TODO: parity with lvm_fallback.PV._parseMeta
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# key names currently (probably) don't match and need to confirm the information's all present
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meta = {}
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try:
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_meta = _BlockDev.lvm.pvinfo(self.devpath)
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except _BlockDev.LVMError:
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self.meta = None
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self.is_pooled = False
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return()
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for k in dir(_meta):
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if k.startswith('_'):
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continue
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elif k in ('copy',):
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continue
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v = getattr(_meta, k)
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meta[k] = v
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self.meta = meta
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self.is_pooled = True
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return()
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def prepare(self):
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try:
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if not self.meta:
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self._parseMeta()
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if self.meta:
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vg = self.meta['vg_name']
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# LVM is SO. DUMB.
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# If you're using LVM, seriously - just switch your model to mdadm. It lets you do things like
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# remove disks live without restructuring the entire thing.
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# That said, because the config references partitions/disks/arrays/etc. created *in the same config*,
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# and it's all dependent on block devices defined in the thing, we can be reckless here.
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# I'd like to take the time now to remind you to NOT RUN AIF-NG ON A "LIVE" MACHINE.
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# At least until I can maybe find a better way to determine which LVs to reduce on multi-LV VGs
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# so I can *then* use lvresize in a balanced manner, vgreduce, and pvmove/pvremove and not kill
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# everything.
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# TODO.
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for lv in _BlockDev.lvm.lvs():
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if lv.vg_name == vg:
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_BlockDev.lvm.lvremove(vg, lv.lv_name)
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_BlockDev.lvm.vgreduce(vg)
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_BlockDev.lvm.vgremove(vg) # This *shouldn't* fail. In theory. But LVM is lel.
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_BlockDev.lvm.pvremove(self.devpath)
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# Or if I can get this working properly. Shame it isn't automagic.
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# Seems to kill the LV by dropping a PV under it. Makes sense, but STILL. LVM IS SO DUMB.
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# _BlockDev.lvm.vgdeactivate(vg)
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# _BlockDev.lvm.pvremove(self.devpath)
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# _BlockDev.lvm.vgreduce(vg)
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# _BlockDev.lvm.vgactivate(vg)
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##
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self.meta = None
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self.is_pooled = False
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except _BlockDev.LVMError:
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self.meta = None
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self.is_pooled = False
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u = uuid.uuid4()
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opts = [_BlockDev.ExtraArg.new('--reportformat', 'json')]
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# FUCK. LVM. You can't *specify* a UUID.
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# u = uuid.uuid4()
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# opts.append(_BlockDev.ExtraArg.new('--uuid', str(u)))
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_BlockDev.lvm.pvcreate(self.devpath,
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0,
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0,
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opts)
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self._parseMeta()
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return()
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class VG(object):
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def __init__(self, vg_xml):
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self.xml = vg_xml
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self.id = self.xml.attrib('id')
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self.name = self.xml.attrib('name')
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self.lvs = []
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self.pvs = []
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self.tags = []
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for te in self.xml.findall('tags/tag'):
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self.tags.append(te.text)
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_common.addBDPlugin('lvm')
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self.devpath = self.name
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self.info = None
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def addPV(self, pvobj):
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if not isinstance(pvobj, PV):
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raise ValueError('pvobj must be of type aif.disk.lvm.PV')
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pvobj.prepare()
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self.pvs.append(pvobj)
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return()
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def create(self):
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if not self.pvs:
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raise RuntimeError('Cannot create a VG with no PVs')
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opts = [_BlockDev.ExtraArg.new('--reportformat', 'json')]
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# FUCK. LVM. You can't *specify* a UUID.
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# u = uuid.uuid4()
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# opts.append(_BlockDev.ExtraArg.new('--uuid', str(u)))
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for t in self.tags:
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opts.append(_BlockDev.ExtraArg.new('--addtag', t))
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_BlockDev.lvm.vgcreate(self.name,
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[p.devpath for p in self.pvs],
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0,
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opts)
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for p in self.pvs:
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p._parseMeta()
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self.updateInfo()
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return()
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def createLV(self, lv_xml = None):
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# If lv_xml is None, we loop through our own XML.
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if lv_xml:
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lv = LV(lv_xml, self)
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lv.create()
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self.lvs.append(lv)
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else:
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for le in self.xml.findall('logicalVolumes/lv'):
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pass
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self.updateInfo()
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return()
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def start(self):
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_BlockDev.lvm.vgactivate(self.name)
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self.updateInfo()
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return()
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def stop(self):
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_BlockDev.lvm.vgdeactivate(self.name)
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self.updateInfo()
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return()
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def updateInfo(self):
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_info = _BlockDev.lvm.vginfo(self.name)
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# TODO: parity with lvm_fallback.VG.updateInfo
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# key names currently (probably) don't match and need to confirm the information's all present
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info = {}
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for k in dir(_info):
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if k.startswith('_'):
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continue
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elif k in ('copy',):
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continue
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v = getattr(_info, k)
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info[k] = v
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self.info = info
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return()
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class LV(object):
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def __init__(self, lv_xml, vgobj):
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self.xml = lv_xml
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self.id = self.xml.attrib('id')
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self.name = self.xml.attrib('name')
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self.size = self.xml.attrib('size') # Convert to bytes. Can get max from _BlockDev.lvm.vginfo(<VG>).free
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self.vg = vg_obj
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if not isinstance(self.vg, VG):
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raise ValueError('vg_obj must be of type aif.disk.lvm.VG')
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_common.addBDPlugin('lvm')
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self.devpath = None
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pass
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