/usr/share/pyshared/ssmlib/misc.py is in system-storage-manager 0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# (C)2011 Red Hat, Inc., Lukas Czerner <lczerner@redhat.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Miscellaneous functions for use by System Storage Manager
import os
import re
import sys
import tempfile
import threading
import subprocess
# List of temporary mount points which should be cleaned up
# before exiting
TMP_MOUNTED = []
def get_unit_size(string):
"""
Check the last character of the string for the unit and return the unit
value, otherwise return zero. It check only the last character of the
string.
>>> get_unit_size("B")
1
>>> get_unit_size("k")
1024
>>> get_unit_size("M")
1048576
>>> get_unit_size("g")
1073741824
>>> get_unit_size("T")
1099511627776...
>>> get_unit_size("p")
1125899906842624...
>>> get_unit_size("")
0
>>> get_unit_size("H")
0
"""
mult = 0
units = {'B': 1, 'K': 2 ** 10, 'M': 2 ** 20, 'G': 2 ** 30, 'T': 2 ** 40,
'P': 2 ** 50}
if len(string) > 0 and string[-1].upper() in units:
mult = units[string[-1].upper()]
return mult
def is_number(string):
"""
Check is the string is number and return True or False.
>>> is_number("3.14")
True
>>> is_number("+3.14")
True
>>> is_number("-3.14")
True
>>> is_number("314")
True
>>> is_number("3a14")
False
"""
try:
float(string)
return True
except ValueError:
return False
def get_real_size(size):
'''
Get the real number from the size argument. It converts the size with units
into the size in kilobytes. Is no unit is specified it defaults to
kilobytes.
>>> get_real_size("3141")
'3141'
>>> get_real_size("3141K")
'3141.00'
>>> get_real_size("3141k")
'3141.00'
>>> get_real_size("3141M")
'3216384.00'
>>> get_real_size("3141G")
'3293577216.00'
>>> get_real_size("3141T")
'3372623069184.00'
>>> get_real_size("3141P")
'3453566022844416.00'
>>> get_real_size("3.14")
'3.14'
>>> get_real_size("+3.14")
'+3.14'
>>> get_real_size("-3.14")
'-3.14'
>>> get_real_size("3.14k")
'3.14'
>>> get_real_size("+3.14K")
'+3.14'
>>> get_real_size("-3.14k")
'-3.14'
>>> get_real_size("3.14G")
'3292528.64'
>>> get_real_size("+3.14g")
'+3292528.64'
>>> get_real_size("-3.14G")
'-3292528.64'
>>> get_real_size("G")
Traceback (most recent call last):
...
Exception: Not supported unit in the size 'G' argument.
>>> get_real_size("3141H")
Traceback (most recent call last):
...
Exception: Not supported unit in the size '3141H' argument.
'''
if is_number(size):
return size
elif is_number(size[:-1]):
# Always use kilobytes in ssm
mult = get_unit_size(size) / 1024
sign = '+' if size[0] == '+' else ''
if mult:
return '{0}{1:.2f}'.format(sign, float(size[:-1]) * mult)
raise Exception("Not supported unit in the " + \
"size \'{0}\' argument.".format(size))
def get_slaves(devname):
return ["/dev/{0}".format(fname) for fname in os.listdir("/sys/block/{0}/slaves".format(devname))]
def get_file_size(path):
'''
Get size of the file (even block device) by seeking to the end of the
file and returning offset. The returning size is in kilobytes.
'''
with open(path, 'r') as f:
return os.lseek(f.fileno(), os.SEEK_SET, os.SEEK_END) / 1024
def check_binary(name):
command = ['which', name]
if run(command, can_fail=True)[0]:
return False
else:
return True
def do_mount(device, directory, options=None):
command = ['mount']
if options:
command.extend(['-o', ",".join(options)])
command.extend([device, directory])
run(command)
def do_umount(mpoint):
command = ['umount', mpoint]
run(command)
def temp_mount(device, options=None):
tmp = tempfile.mkdtemp()
do_mount(device, tmp, options)
TMP_MOUNTED.append(tmp)
return tmp
def temp_umount(mpoint=None):
if not mpoint:
mpoint = TMP_MOUNTED.pop()
do_umount(mpoint)
os.rmdir(mpoint)
def do_cleanup():
while 1:
try:
temp_umount()
except IndexError:
break
def get_fs_type(dev):
command = ["blkid", "-p", "-u", "filesystem", "-s", "TYPE", dev]
output = run(command, can_fail=True)[1]
m = re.search(r"TYPE=\"(?P<fstyp>\w+)\"", output)
if m:
fstype = m.group('fstyp')
return fstype
else:
return None
def get_real_device(device):
if os.path.islink(device):
return os.path.abspath(os.path.join(os.path.dirname(device),
os.readlink(device)))
else:
return device
def get_swaps():
swap = []
with open('/proc/swaps', 'r') as f:
for line in f.readlines()[1:]:
swap.append(line.split())
return swap
def get_partitions():
partitions = []
with open('/proc/partitions', 'r') as f:
for line in f.readlines()[2:]:
partitions.append(line.split())
return partitions
def get_mountinfo(regex=".*"):
mounts = {}
reg = re.compile(regex)
names = ['id', 'parent', 'major_minor', 'root', 'mp', 'options']
with open('/proc/self/mountinfo', 'r') as f:
for line in f:
m = reg.search(line)
if not m:
continue
array = line.split(None, 6)
row = dict([(names[index], array[index])
for index in min(range(len(array) - 1), range(len(names)))])
array = line.rsplit(None, 3)
row['fs'] = array[1]
row['dev'] = array[2]
row['sb_options'] = array[3]
dev = get_real_device(row['dev'])
if dev in mounts:
dev = "{0}:{1}".format(dev, row['root'])
mounts[dev] = row
return mounts
def get_mounts_old(regex=".*"):
mounts = {}
reg = re.compile(regex)
with open('/proc/mounts', 'r') as f:
for line in f:
m = reg.search(line)
if m:
l = line.split()[:2]
dev = get_real_device(l[0])
mounts[dev] = {'dev': l[0], 'mp': l[1]}
return mounts
def get_mounts(regex=".*"):
if os.path.exists("/proc/self/mountinfo"):
return get_mountinfo(regex)
else:
return get_mounts_old(regex)
def get_dmnumber(name):
reg = re.compile(" {0}$".format(name))
dmnumber = None
with open('/proc/devices', 'r') as f:
for line in f:
m = reg.search(line)
if m:
dmnumber = line.split()[0]
break
return dmnumber
def wipefs(device, typ):
command = ['wipefs', '-p', device]
output = run(command)[1]
for line in output[1:].split('\n'):
if not line:
continue
array = line.split(",")
if array[-1] == typ:
command = ['wipefs', '--offset', array[0], device]
run(command)
def humanize_size(arg):
"""
Returns the number with power of two units "KiB, MiB, ...etc. Parameter arg
should be string of non-zero length, or integer. IMPORTANT: The arg
argument is expected to be in KiB.
>>> humanize_size(314)
'314.00 KB'
>>> humanize_size("314")
'314.00 KB'
>>> humanize_size(314159)
'306.80 MB'
>>> humanize_size(314159265)
'299.61 GB'
>>> humanize_size(314159265358)
'292.58 TB'
>>> humanize_size(314159265358979)
'285.73 PB'
>>> humanize_size(314159265358979323)
'279.03 EB'
>>> humanize_size(314159265358979323846)
'272.49 ZB'
>>> humanize_size(314159265358979323846264)
'266.10 YB'
>>> humanize_size(314159265358979323846264338)
'266103.25 YB'
>>> humanize_size(-314159265)
'-299.61 GB'
>>> humanize_size("")
''
>>> humanize_size("hello world")
Traceback (most recent call last):
...
ValueError: could not convert string to float: hello world
"""
count = 0
if type(arg) is str and len(arg) == 0:
return ""
size = float(arg)
while abs(size) >= 1024 and count < 7:
size /= 1024
count += 1
units = ["KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
try:
unit = units[count]
except IndexError:
unit = "???"
return ("{0:.2f} {1}").format(size, unit)
def run(cmd, show_cmd=False, stdout=False, stderr=True, can_fail=False,
stdin_data=None, return_stdout=True):
stdin = None
if stdin_data is not None:
stdin = subprocess.PIPE
if stderr:
stderr = subprocess.STDOUT
else:
stderr = subprocess.PIPE
if stdout:
stdout = None
else:
stdout = subprocess.PIPE
proc = subprocess.Popen(cmd, stdout=stdout,
stderr=stderr, stdin=stdin)
if stdin_data is not None:
class StdinThread(threading.Thread):
def run(self):
proc.stdin.write(stdin_data)
proc.stdin.close()
stdin_thread = StdinThread()
stdin_thread.daemon = True
stdin_thread.start()
output, error = proc.communicate()
if stdin_data is not None:
stdin_thread.join()
err_msg = "ERROR running command: \"{0}\"".format(" ".join(cmd))
if proc.returncode != 0 and show_cmd:
if output is not None:
print output
if error is not None:
print error
print >> sys.stderr, err_msg
if proc.returncode != 0 and not can_fail:
if output is not None:
print output
if error is not None:
print error
raise RuntimeError(err_msg)
if not return_stdout:
output = None
return (proc.returncode, output)
def chain(*iterables):
"""
Make an iterator that returns elements from the first iterable until
it is exhausted, then proceeds to the next iterable, until all of the
iterables are exhausted. Used for treating consecutive sequences as a
single sequence. This code has been taken from itertools python module.
chain('ABC', 'DEF') --> A B C D E F
"""
for it in iterables:
for element in it:
yield element
def izip(*iterables):
"""
Make an iterator that aggregates elements from each of the iterables.
Like zip() except that it returns an iterator instead of a list. Used
for lock-step iteration over several iterables at a time. This code has
been taken from itertools python module.
izip('ABCD', 'xy') --> Ax By
"""
iterators = map(iter, iterables)
while iterators:
yield tuple(map(next, iterators))
def compress(data, selectors):
"""
Make an iterator that filters elements from data returning only those
that have a corresponding element in selectors that evaluates to True.
Stops when either the data or selectors iterables has been exhausted.
This code has been taken from itertools python module.
compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F
"""
return (d for d, s in izip(data, selectors) if s)
def permutations(iterable, r=None):
"""
Return successive r length permutations of elements in the iterable.
This code has been taken from itertools python module.
permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
permutations(range(3)) --> 012 021 102 120 201 210
"""
pool = tuple(iterable)
n = len(pool)
r = n if r is None else r
if r > n:
return
indices = range(n)
cycles = range(n, n-r, -1)
yield tuple(pool[i] for i in indices[:r])
while n:
for i in reversed(range(r)):
cycles[i] -= 1
if cycles[i] == 0:
indices[i:] = indices[i+1:] + indices[i:i+1]
cycles[i] = n - i
else:
j = cycles[i]
indices[i], indices[-j] = indices[-j], indices[i]
yield tuple(pool[i] for i in indices[:r])
break
else:
return
def terminal_size(default=(25, 80)):
"""
Returns running terminal size. If size cannot be found out default size
is returned.
"""
def _ioctl_GWINSZ(fd):
try:
import fcntl
import termios
import struct
cr = struct.unpack('hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
except:
return None
return cr
try:
env = os.environ
cr = (env['LINES'], env['COLUMNS'])
except:
cr = _ioctl_GWINSZ(0) or _ioctl_GWINSZ(1) or _ioctl_GWINSZ(2)
if not cr:
try:
fd = os.open(os.ctermid(), os.O_RDONLY)
cr = _ioctl_GWINSZ(fd)
os.close(fd)
except:
pass
if not cr:
cr = (25, 80)
return int(cr[1]), int(cr[0])
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