296 lines
12 KiB
Python
296 lines
12 KiB
Python
import math
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import os
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import pathlib
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import re
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import shlex
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import subprocess
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##
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import psutil
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def checkMounted(devpath):
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if devpath in [p.device for p in psutil.disk_partitions(all = True)]:
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raise RuntimeError('{0} is mounted; we are cowardly refusing to destructive operations on it'.format(devpath))
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return()
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def collapseKeys(d, keylist = None):
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if not keylist:
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keylist = []
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for k, v in d.items():
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if isinstance(v, dict):
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keylist.append(k)
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keylist = collapseKeys(v, keylist = keylist)
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else:
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keylist.append(k)
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return(keylist)
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def collapseValues(d, vallist = None):
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if not vallist:
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vallist = []
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for k, v in d.items():
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if isinstance(v, dict):
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vallist = collapseValues(v, vallist = vallist)
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else:
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vallist.append(v)
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return(vallist)
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def hasBin(binary_name):
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paths = []
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for p in os.environ.get('PATH', '/usr/bin:/bin').split(':'):
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if binary_name in os.listdir(os.path.realpath(p)):
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return(os.path.join(p, binary_name))
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return(False)
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def hasSafeChunks(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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def isPowerofTwo(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 kernelCmdline(chroot_base = '/'):
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cmds = {}
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chroot_base = pathlib.PosixPath(chroot_base)
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cmdline = chroot_base.joinpath('proc', 'cmdline')
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if not os.path.isfile(cmdline):
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return(cmds)
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with open(cmdline, 'r') as fh:
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raw_cmds = fh.read().strip()
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for c in shlex.split(raw_cmds):
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l = c.split('=', 1)
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if len(l) < 2:
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l.append(None)
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cmds[l[0]] = l[1]
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return(cmds)
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def kernelFilesystems():
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# I wish there was a better way of doing this.
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# https://unix.stackexchange.com/a/98680
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FS_FSTYPES = ['swap']
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with open('/proc/filesystems', 'r') as fh:
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for line in fh.readlines():
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l = [i.strip() for i in line.split()]
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if not l:
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continue
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if len(l) == 1:
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FS_FSTYPES.append(l[0])
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else:
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FS_FSTYPES.append(l[1])
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_mod_dir = os.path.join('/lib/modules',
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os.uname().release,
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'kernel/fs')
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_strip_mod_suffix = re.compile(r'(?P<fsname>)\.ko(\.(x|g)?z)?$', re.IGNORECASE)
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try:
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for i in os.listdir(_mod_dir):
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path = os.path.join(_mod_dir, i)
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fs_name = None
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if os.path.isdir(path):
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fs_name = i
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elif os.path.isfile(path):
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mod_name = _strip_mod_suffix.search(i)
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fs_name = mod_name.group('fsname')
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if fs_name:
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# The kernel *probably* has autoloading enabled, but in case it doesn't...
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# TODO: logging!
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if os.getuid() == 0:
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subprocess.run(['modprobe', fs_name])
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FS_FSTYPES.append(fs_name)
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except FileNotFoundError:
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# We're running on a kernel that doesn't have modules
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pass
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FS_FSTYPES = sorted(list(set(FS_FSTYPES)))
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return(FS_FSTYPES)
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def xmlBool(xmlobj):
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# https://bugs.launchpad.net/lxml/+bug/1850221
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if isinstance(xmlobj, bool):
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return (xmlobj)
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if xmlobj.lower() in ('1', 'true'):
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return(True)
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elif xmlobj.lower() in ('0', 'false'):
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return(False)
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else:
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return(None)
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class _Sizer(object):
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def __init__(self):
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# We use different methods for converting between storage and BW, and different multipliers for each subtype.
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# https://stackoverflow.com/a/12912296/733214
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# https://stackoverflow.com/a/52684562/733214
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# https://stackoverflow.com/questions/5194057/better-way-to-convert-file-sizes-in-python
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# https://en.wikipedia.org/wiki/Orders_of_magnitude_(data)
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# https://en.wikipedia.org/wiki/Binary_prefix
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# 'decimal' is base-10, 'binary' is base-2. (Duh.)
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# "b" = bytes, "n" = given value, and "u" = unit suffix's key in below notes.
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self.storageUnits = {'decimal': { # n * (10 ** u) = b; b / (10 ** u) = u
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0: (None, 'B', 'byte'),
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3: ('k', 'kB', 'kilobyte'),
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6: ('M', 'MB', 'megabyte'),
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9: ('G', 'GB', 'gigabyte'),
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12: ('T', 'TB', 'teraybte'),
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13: ('P', 'PB', 'petabyte'), # yeah, right.
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15: ('E', 'EB', 'exabyte'),
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18: ('Z', 'ZB', 'zettabyte'),
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19: ('Y', 'YB', 'yottabyte')
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},
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'binary': { # n * (2 ** u) = b; b / (2 ** u) = u
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-1: ('nybble', 'nibble', 'nyble', 'half-byte', 'tetrade', 'nibble'),
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10: ('Ki', 'KiB', 'kibibyte'),
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20: ('Mi', 'MiB', 'mebibyte'),
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30: ('Gi', 'GiB', 'gibibyte'),
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40: ('Ti', 'TiB', 'tebibyte'),
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50: ('Pi', 'PiB', 'pebibyte'),
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60: ('Ei', 'EiB', 'exbibyte'),
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70: ('Zi', 'ZiB', 'zebibyte'),
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80: ('Yi', 'YiB', 'yobibyte')
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}}
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# https://en.wikipedia.org/wiki/Bit#Multiple_bits - note that 8 bits = 1 byte
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self.bwUnits = {'decimal': { # n * (10 ** u) = b; b / (10 ** u) = u
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0: (None, 'b', 'bit'),
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3: ('k', 'kb', 'kilobit'),
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6: ('M', 'Mb', 'megabit'),
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9: ('G', 'Gb', 'gigabit'),
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12: ('T', 'Tb', 'terabit'),
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13: ('P', 'Pb', 'petabit'),
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15: ('E', 'Eb', 'exabit'),
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18: ('Z', 'Zb', 'zettabit'),
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19: ('Y', 'Yb', 'yottabit')
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},
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'binary': { # n * (2 ** u) = b; b / (2 ** u) = u
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-1: ('semi-octet', 'quartet', 'quadbit'),
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10: ('Ki', 'Kib', 'kibibit'),
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20: ('Mi', 'Mib', 'mebibit'),
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30: ('Gi', 'Gib', 'gibibit'),
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40: ('Ti', 'Tib', 'tebibit'),
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50: ('Pi', 'Pib', 'pebibit'),
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60: ('Ei', 'Eib', 'exbibit'),
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70: ('Zi', 'Zib', 'zebibit'),
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80: ('Yi', 'Yib', 'yobibit')
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}}
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self.valid_storage = []
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for unit_type, convpair in self.storageUnits.items():
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for f, l in convpair.items():
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for suffix in l:
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if suffix not in self.valid_storage and suffix:
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self.valid_storage.append(suffix)
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self.valid_bw = []
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for unit_type, convpair in self.bwUnits.items():
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for f, l in convpair.items():
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for suffix in l:
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if suffix not in self.valid_bw and suffix:
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self.valid_bw.append(suffix)
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def convert(self, n, suffix):
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conversion = {}
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if suffix in self.valid_storage:
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conversion.update(self.convertStorage(n, suffix))
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b = conversion['B'] * 8
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conversion.update(self.convertBW(b, 'b'))
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elif suffix in self.valid_bw:
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conversion.update(self.convertBW(n, suffix))
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b = conversion['b'] / 8
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conversion.update(self.convertStorage(b, 'B'))
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return(conversion)
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def convertBW(self, n, suffix, target = None):
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inBits = None
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conversion = None
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base_factors = []
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if suffix not in self.valid_bw:
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raise ValueError('suffix is not a valid unit notation for this conversion')
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if target and target not in self.valid_bw:
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raise ValueError('target is not a valid unit notation for this conversion')
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for (_unit_type, _base) in (('decimal', 10), ('binary', 2)):
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if target and base_factors:
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break
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for u, suffixes in self.bwUnits[_unit_type].items():
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if all((target, inBits, base_factors)):
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break
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if suffix in suffixes:
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inBits = n * float(_base ** u)
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if target and target in suffixes:
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base_factors.append((_base, u, suffixes[1]))
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elif not target:
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base_factors.append((_base, u, suffixes[1]))
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if target:
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conversion = float(inBits) / float(base_factors[0][0] ** base_factors[0][1])
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else:
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if not isinstance(conversion, dict):
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conversion = {}
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for base, factor, suffix in base_factors:
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conversion[suffix] = float(inBits) / float(base ** factor)
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return(conversion)
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def convertStorage(self, n, suffix, target = None):
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inBytes = None
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conversion = None
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base_factors = []
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if suffix not in self.valid_storage:
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raise ValueError('suffix is not a valid unit notation for this conversion')
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if target and target not in self.valid_storage:
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raise ValueError('target is not a valid unit notation for this conversion')
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for (_unit_type, _base) in (('decimal', 10), ('binary', 2)):
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if target and base_factors:
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break
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for u, suffixes in self.storageUnits[_unit_type].items():
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if all((target, inBytes, base_factors)):
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break
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if suffix in suffixes:
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inBytes = n * float(_base ** u)
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if target and target in suffixes:
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base_factors.append((_base, u, suffixes[1]))
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elif not target:
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base_factors.append((_base, u, suffixes[1]))
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if target:
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conversion = float(inBytes) / float(base_factors[0][0] ** base_factors[0][1])
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else:
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if not isinstance(conversion, dict):
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conversion = {}
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for base, factor, suffix in base_factors:
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conversion[suffix] = float(inBytes) / float(base ** factor)
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return(conversion)
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size = _Sizer()
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# We do this as base level so they aren't compiled on every invocation/instantiation.
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# Unfortunately it has to be at the bottom so we can call the instantiated _Sizer() class.
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# parted lib can do SI or IEC. So can we.
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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(size.valid_storage))
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))
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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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