214 lines
9.0 KiB
Python
214 lines
9.0 KiB
Python
# To reproduce sgdisk behaviour in v1 of AIF-NG:
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# https://gist.github.com/herry13/5931cac426da99820de843477e41e89e
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# https://github.com/dcantrell/pyparted/blob/master/examples/query_device_capacity.py
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# TODO: Remember to replicate genfstab behaviour.
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import os
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import re
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import subprocess
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try:
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# https://stackoverflow.com/a/34812552/733214
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# https://github.com/karelzak/util-linux/blob/master/libmount/python/test_mount_context.py#L6
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import libmount as mount
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except ImportError:
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# We should never get here. util-linux is part of core (base) in Arch and uses "libmount".
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import pylibmount as mount
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##
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import blkinfo
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import parted # https://www.gnu.org/software/parted/api/index.html
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import psutil
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##
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from .aif_util import xmlBool
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from .constants import PARTED_FSTYPES
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# parted lib can do SI or IEC (see table to right at https://en.wikipedia.org/wiki/Binary_prefix)
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# We bit-shift to do conversions:
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# https://stackoverflow.com/a/12912296/733214
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# https://stackoverflow.com/a/52684562/733214
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_units = {'B': 0,
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'kB': 7,
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'MB': 17,
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'GB': 27,
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'TB': 37,
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'KiB': 10,
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'MiB': 20,
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'GiB': 30,
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'TiB': 40}
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_pos_re = re.compile((r'^(?P<pos_or_neg>-|\+)?\s*'
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r'(?P<size>[0-9]+)\s*'
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# empty means size in sectors
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r'(?P<pct_unit_or_sct>%|[{0}]|)\s*$'.format(''.join(list(_units.keys())))),
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re.IGNORECASE)
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def convertSizeUnit(pos):
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orig_pos = pos
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pos = _pos_re.search(pos)
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if pos:
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pos_or_neg = (pos.group('pos_or_neg') if pos.group('pos_or_neg') else None)
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if pos_or_neg == '+':
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from_beginning = True
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elif pos_or_neg == '-':
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from_beginning = False
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else:
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from_beginning = pos_or_neg
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size = int(pos.group('size'))
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amt_type = pos.group('pct_unit_or_sct').strip()
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else:
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raise ValueError('Invalid size specified: {0}'.format(orig_pos))
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return((from_beginning, size, amt_type))
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class Partition(object):
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def __init__(self, part_xml, diskobj, start_sector, partnum, tbltype):
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if tbltype not in ('gpt', 'msdos'):
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raise ValueError('{0} must be one of gpt or msdos'.format(tbltype))
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self.xml = part_xml
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self.partnum = partnum
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self.fstype = self.xml.attrib['fsType'].lower()
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if self.fstype not in PARTED_FSTYPES:
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raise ValueError(('{0} is not a valid partition filesystem type; '
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'must be one of: {1}').format(self.xml.attrib['fsType'],
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', '.join(sorted(PARTED_FSTYPES))))
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self.disk = diskobj
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self.device = self.disk.device
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self.dev = '{0}{1}'.format(self.device.path, partnum)
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sizes = {}
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for s in ('start', 'stop'):
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x = dict(zip(('from_bgn', 'size', 'type'),
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convertSizeUnit(self.xml.attrib[s])))
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sectors = x['size']
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if x['type'] == '%':
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sectors = int(self.device.getLength() / x['size'])
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elif x['type'] in _units.keys():
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sectors = int(x['size'] << _units[x['type']] / self.device.sectorSize)
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sizes[s] = (sectors, x['from_bgn'])
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if sizes['start'][1] is not None:
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if sizes['start'][1]:
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self.begin = sizes['start'][0] + 0
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else:
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self.begin = self.device.getLength() - sizes['start'][0]
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else:
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self.begin = sizes['start'][0] + start_sector
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if sizes['stop'][1] is not None:
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if sizes['stop'][1]:
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self.end = sizes['stop'][0] + 0
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else:
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# This *technically* should be - 34, but the alignment optimizer fixes it for us.
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self.end = (self.device.getLength() - 1) - sizes['stop'][0]
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else:
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self.end = self.begin + sizes['stop'][0]
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# TECHNICALLY we could craft the Geometry object with "length = ...", but it doesn't let us be explicit
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# in configs. So we manually crunch the numbers and do it all at the end.
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self.geometry = parted.Geometry(device = self.device,
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start = self.begin,
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end = self.end)
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self.filesystem = parted.FileSystem(type = self.fstype,
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geometry = self.geometry)
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self.partition = parted.Partition(disk = diskobj,
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type = parted.PARTITION_NORMAL,
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geometry = self.geometry,
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fs = self.filesystem)
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if tbltype == 'gpt' and self.xml.attrib.get('name'):
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# The name attribute setting is b0rk3n, so we operate on the underlying PedPartition object.
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# https://github.com/dcantrell/pyparted/issues/49#issuecomment-540096687
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# https://github.com/dcantrell/pyparted/issues/65
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# self.partition.name = self.xml.attrib.get('name')
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_pedpart = self.partition.getPedPartition()
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_pedpart.set_name(self.xml.attrib.get('name'))
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class Disk(object):
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def __init__(self, disk_xml):
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self.xml = disk_xml
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self.devpath = self.xml.attrib['device']
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self.partitions = []
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self._initDisk()
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def _initDisk(self):
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self.device = parted.getDevice(self.devpath)
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try:
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self.disk = parted.newDisk(self.device)
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self.is_new = False
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if xmlBool(self.xml.attrib.get('forceReformat')):
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self.is_lowformatted = False
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self.is_hiformatted = False
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else:
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self.is_lowformatted = True
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self.is_hiformatted = False
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for d in blkinfo.BlkDiskInfo().get_disks(filters = {'group': 'disk',
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'name': os.path.basename(self.devpath),
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'kname': os.path.basename(self.devpath)}):
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if d.get('fstype', '').strip() != '':
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self.is_hiformatted = True
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break
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except parted._ped.DiskException:
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self.disk = None
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self.is_new = True
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self.is_lowformatted = False
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self.is_hiformatted = False
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self.is_partitioned = False
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return()
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def diskFormat(self):
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if self.is_lowformatted:
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return()
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# This is a safeguard. We do *not* want to low-format a disk that is mounted.
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for p in psutil.disk_partitions(all = True):
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if self.devpath in p:
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raise RuntimeError('{0} is mounted; we are cowardly refusing to low-format it'.format(self.devpath))
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if not self.is_new:
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self.disk.deleteAllPartitions()
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self.tabletype = self.xml.attrib.get('diskFormat', 'gpt').lower()
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if self.tabletype in ('bios', 'mbr', 'dos'):
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self.tabletype = 'msdos'
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validlabels = parted.getLabels()
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if self.tabletype not in validlabels:
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raise ValueError(('Disk format {0} is not valid for this architecture;'
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'must be one of: {1}'.format(self.tabletype, ', '.join(list(validlabels)))))
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self.disk = parted.freshDisk(self.device, self.tabletype)
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self.is_lowformatted = True
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return()
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def fsFormat(self):
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if self.is_hiformatted:
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return()
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# This is a safeguard. We do *not* want to high-format a disk that is mounted.
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for p in psutil.disk_partitions(all = True):
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if self.devpath in p:
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raise RuntimeError('{0} is mounted; we are cowardly refusing to high-format it'.format(self.devpath))
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# TODO!
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pass
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return()
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def getPartitions(self):
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# For GPT, this *technically* should be 34 -- or, more precisely, 2048 (see FAQ in manual), but the alignment
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# optimizer fixes it for us automatically.
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start_sector = 0
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self.partitions = []
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for idx, part in enumerate(self.xml.findall('part')):
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p = Partition(part, self.disk, start_sector, idx + 1, self.tabletype)
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start_sector = p.end + 1
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self.partitions.append(p)
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return()
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def partFormat(self):
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if self.is_partitioned:
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return()
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if not self.is_lowformatted:
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self.diskFormat()
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# This is a safeguard. We do *not* want to partition a disk that is mounted.
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for p in psutil.disk_partitions(all = True):
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if self.devpath in p:
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raise RuntimeError('{0} is mounted; we are cowardly refusing to low-format it'.format(self.devpath))
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if not self.partitions:
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self.getPartitions()
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if not self.partitions:
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return()
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for p in self.partitions:
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self.disk.addPartition(partition = p, constraint = self.device.optimalAlignedConstraint)
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self.disk.commit()
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self.is_partitioned = True
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return()
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