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#
# Copyright (c) 2018 Red Hat, Inc.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
"""
Utils - miscellaneous utilities for the VDO manager
$Id: //eng/vdo-releases/magnesium/src/python/vdo/vdomgmnt/Utils.py#1 $
"""
from utils import CommandError, runCommand
import distutils.spawn
import errno
import os
import signal
import time
class Utils(object):
"""Utils contains miscellaneous utilities."""
KiB = 1024
MiB = 1024 * KiB
GiB = 1024 * MiB
TiB = 1024 * GiB
PiB = 1024 * TiB
######################################################################
# Public methods
######################################################################
@staticmethod
def abspathPath(path):
"""Takes a path or a colon-separated list of paths and makes
each one an absolute path. Paths that don't exist are left alone."""
return os.pathsep.join([os.path.abspath(p) for p in path.split(os.pathsep)])
######################################################################
@staticmethod
def appendToPath(path):
"""Appends a directory or directories to the current PATH.
Arguments:
path (str): A directory or colon-separated list of directories.
"""
os.environ['PATH'] += os.pathsep + path
######################################################################
@staticmethod
def isPowerOfTwo(i):
"""Returns True iff its argument is a power of two."""
return (i != 0) and ((i & (i - 1)) == 0)
######################################################################
@classmethod
def killProcess(cls, pid):
"""Kills a process and waits for it to die.
Arguments:
pid: process id to kill
Throws:
Any unexpected OS error
"""
try:
os.kill(pid, signal.SIGTERM)
while True:
time.sleep(1)
os.kill(pid, 0)
except OSError as e:
if e.errno != errno.ESRCH:
raise e
######################################################################
@staticmethod
def maxNum(a, b):
"""Returns the maximum of two numbers."""
if a > b:
return a
return b
######################################################################
@staticmethod
def which(cmd):
"""Finds the full path to a command.
Arguments:
cmd (str): The command to search for.
Returns:
The full path as a string, or None if the command is not found.
"""
return distutils.spawn.find_executable(cmd)
######################################################################
# Overridden methods
######################################################################
def __init__(self):
pass
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