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76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
#!/usr/bin/python
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# encoding: utf-8
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#
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# Copyright 2009-2016 Greg Neagle.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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powermgr.py
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munki module to toggle IOKit/PowerManager idle sleep assertions.
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"""
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# pylint: disable=E0611
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# stuff for IOKit/PowerManager, courtesy Michael Lynn, pudquick@github
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from ctypes import c_uint32, cdll, c_void_p, POINTER, byref
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from CoreFoundation import CFStringCreateWithCString
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from CoreFoundation import kCFStringEncodingASCII
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from objc import pyobjc_id
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# pylint: enable=E0611
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# lots of camelCase names
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# pylint: disable=C0103
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libIOKit = cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
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libIOKit.IOPMAssertionCreateWithName.argtypes = [
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c_void_p, c_uint32, c_void_p, POINTER(c_uint32)]
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libIOKit.IOPMAssertionRelease.argtypes = [c_uint32]
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def _CFSTR(py_string):
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"""Returns a CFString given a Python string."""
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return CFStringCreateWithCString(None, py_string, kCFStringEncodingASCII)
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def _rawPointer(pyobjc_string):
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"""Returns a pointer to a CFString."""
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return pyobjc_id(pyobjc_string.nsstring())
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def _IOPMAssertionCreateWithName(assert_name, assert_level, assert_msg):
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"""Creaes a PowerManager assertion."""
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assertID = c_uint32(0)
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p_assert_name = _rawPointer(_CFSTR(assert_name))
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p_assert_msg = _rawPointer(_CFSTR(assert_msg))
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errcode = libIOKit.IOPMAssertionCreateWithName(
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p_assert_name, assert_level, p_assert_msg, byref(assertID))
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return (errcode, assertID)
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def assertNoIdleSleep():
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"""Uses IOKit functions to prevent idle sleep."""
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# based on code by Michael Lynn, pudquick@github
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kIOPMAssertionTypeNoIdleSleep = "NoIdleSleepAssertion"
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kIOPMAssertionLevelOn = 255
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reason = "Munki is installing software"
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dummy_errcode, assertID = _IOPMAssertionCreateWithName(
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kIOPMAssertionTypeNoIdleSleep,
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kIOPMAssertionLevelOn,
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reason)
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return assertID
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def removeNoIdleSleepAssertion(assertion_id):
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"""Uses IOKit functions to remove a "no idle sleep" assertion."""
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return libIOKit.IOPMAssertionRelease(assertion_id)
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