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# encoding: utf-8

"""

Utilities for getting information about IPython and the system it's running in.

"""

#-----------------------------------------------------------------------------

# Copyright (C) 2008-2011 The IPython Development Team

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------

# Imports

#-----------------------------------------------------------------------------

import os

import platform

import pprint

import sys

import subprocess

from IPython.core import release

from IPython.utils import py3compat, _sysinfo, encoding

#-----------------------------------------------------------------------------

# Code

#-----------------------------------------------------------------------------

def pkg_commit_hash(pkg_path):

"""Get short form of commit hash given directory `pkg_path`

We get the commit hash from (in order of preference):

* IPython.utils._sysinfo.commit

* git output, if we are in a git repository

If these fail, we return a not-found placeholder tuple

Parameters

----------

pkg_path : str

directory containing package

only used for getting commit from active repo

Returns

-------

hash_from : str

Where we got the hash from - description

hash_str : str

short form of hash

"""

# Try and get commit from written commit text file

if _sysinfo.commit:

return "installation", _sysinfo.commit

# maybe we are in a repository

proc = subprocess.Popen('git rev-parse --short HEAD',

stdout=subprocess.PIPE,

stderr=subprocess.PIPE,

cwd=pkg_path, shell=True)

repo_commit, _ = proc.communicate()

if repo_commit:

return 'repository', repo_commit.strip()

return '(none found)', '<not found>'

def pkg_info(pkg_path):

"""Return dict describing the context of this package

Parameters

----------

pkg_path : str

path containing __init__.py for package

Returns

-------

context : dict

with named parameters of interest

"""

src, hsh = pkg_commit_hash(pkg_path)

return dict(

ipython_version=release.version,

ipython_path=pkg_path,

commit_source=src,

commit_hash=hsh,

sys_version=sys.version,

sys_executable=sys.executable,

sys_platform=sys.platform,

platform=platform.platform(),

os_name=os.name,

default_encoding=encoding.DEFAULT_ENCODING,

)

@py3compat.doctest_refactor_print

def sys_info():

"""Return useful information about IPython and the system, as a string.

Example

-------

In [2]: print sys_info()

{'commit_hash': '144fdae', # random

'commit_source': 'repository',

'ipython_path': '/home/fperez/usr/lib/python2.6/site-packages/IPython',

'ipython_version': '0.11.dev',

'os_name': 'posix',

'platform': 'Linux-2.6.35-22-generic-i686-with-Ubuntu-10.10-maverick',

'sys_executable': '/usr/bin/python',

'sys_platform': 'linux2',

'sys_version': '2.6.6 (r266:84292, Sep 15 2010, 15:52:39) \\n[GCC 4.4.5]'}

"""

p = os.path

path = p.dirname(p.abspath(p.join(__file__, '..')))

return pprint.pformat(pkg_info(path))

def _num_cpus_unix():

"""Return the number of active CPUs on a Unix system."""

return os.sysconf("SC_NPROCESSORS_ONLN")

def _num_cpus_darwin():

"""Return the number of active CPUs on a Darwin system."""

p = subprocess.Popen(['sysctl','-n','hw.ncpu'],stdout=subprocess.PIPE)

return p.stdout.read()

def _num_cpus_windows():

"""Return the number of active CPUs on a Windows system."""

return os.environ.get("NUMBER_OF_PROCESSORS")

def num_cpus():

"""Return the effective number of CPUs in the system as an integer.

This cross-platform function makes an attempt at finding the total number of

available CPUs in the system, as returned by various underlying system and

python calls.

If it can't find a sensible answer, it returns 1 (though an error *may* make

it return a large positive number that's actually incorrect).

"""

# Many thanks to the Parallel Python project (http://www.parallelpython.com)

# for the names of the keys we needed to look up for this function. This

# code was inspired by their equivalent function.

ncpufuncs = {'Linux':_num_cpus_unix,

'Darwin':_num_cpus_darwin,

'Windows':_num_cpus_windows,

# On Vista, python < 2.5.2 has a bug and returns 'Microsoft'

# See http://bugs.python.org/issue1082 for details.

'Microsoft':_num_cpus_windows,

}

ncpufunc = ncpufuncs.get(platform.system(),

# default to unix version (Solaris, AIX, etc)

_num_cpus_unix)

try:

ncpus = max(1,int(ncpufunc()))

except:

ncpus = 1

return ncpus