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platform.py
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#!/usr/bin/env python3
""" This module tries to retrieve as much platform-identifying data as
possible. It makes this information available via function APIs.
If called from the command line, it prints the platform
information concatenated as single string to stdout. The output
format is useable as part of a filename.
"""
# This module is maintained by Marc-Andre Lemburg <mal@egenix.com>.
# If you find problems, please submit bug reports/patches via the
# Python bug tracker (http://bugs.python.org) and assign them to "lemburg".
#
# Still needed:
# * more support for WinCE
# * support for MS-DOS (PythonDX ?)
# * support for Amiga and other still unsupported platforms running Python
# * support for additional Linux distributions
#
# Many thanks to all those who helped adding platform-specific
# checks (in no particular order):
#
# Charles G Waldman, David Arnold, Gordon McMillan, Ben Darnell,
# Jeff Bauer, Cliff Crawford, Ivan Van Laningham, Josef
# Betancourt, Randall Hopper, Karl Putland, John Farrell, Greg
# Andruk, Just van Rossum, Thomas Heller, Mark R. Levinson, Mark
# Hammond, Bill Tutt, Hans Nowak, Uwe Zessin (OpenVMS support),
# Colin Kong, Trent Mick, Guido van Rossum, Anthony Baxter, Steve
# Dower
#
# History:
#
# <see CVS and SVN checkin messages for history>
#
# 1.0.8 - changed Windows support to read version from kernel32.dll
# 1.0.7 - added DEV_NULL
# 1.0.6 - added linux_distribution()
# 1.0.5 - fixed Java support to allow running the module on Jython
# 1.0.4 - added IronPython support
# 1.0.3 - added normalization of Windows system name
# 1.0.2 - added more Windows support
# 1.0.1 - reformatted to make doc.py happy
# 1.0.0 - reformatted a bit and checked into Python CVS
# 0.8.0 - added sys.version parser and various new access
# APIs (python_version(), python_compiler(), etc.)
# 0.7.2 - fixed architecture() to use sizeof(pointer) where available
# 0.7.1 - added support for Caldera OpenLinux
# 0.7.0 - some fixes for WinCE; untabified the source file
# 0.6.2 - support for OpenVMS - requires version 1.5.2-V006 or higher and
# vms_lib.getsyi() configured
# 0.6.1 - added code to prevent 'uname -p' on platforms which are
# known not to support it
# 0.6.0 - fixed win32_ver() to hopefully work on Win95,98,NT and Win2k;
# did some cleanup of the interfaces - some APIs have changed
# 0.5.5 - fixed another type in the MacOS code... should have
# used more coffee today ;-)
# 0.5.4 - fixed a few typos in the MacOS code
# 0.5.3 - added experimental MacOS support; added better popen()
# workarounds in _syscmd_ver() -- still not 100% elegant
# though
# 0.5.2 - fixed uname() to return '' instead of 'unknown' in all
# return values (the system uname command tends to return
# 'unknown' instead of just leaving the field empty)
# 0.5.1 - included code for slackware dist; added exception handlers
# to cover up situations where platforms don't have os.popen
# (e.g. Mac) or fail on socket.gethostname(); fixed libc
# detection RE
# 0.5.0 - changed the API names referring to system commands to *syscmd*;
# added java_ver(); made syscmd_ver() a private
# API (was system_ver() in previous versions) -- use uname()
# instead; extended the win32_ver() to also return processor
# type information
# 0.4.0 - added win32_ver() and modified the platform() output for WinXX
# 0.3.4 - fixed a bug in _follow_symlinks()
# 0.3.3 - fixed popen() and "file" command invokation bugs
# 0.3.2 - added architecture() API and support for it in platform()
# 0.3.1 - fixed syscmd_ver() RE to support Windows NT
# 0.3.0 - added system alias support
# 0.2.3 - removed 'wince' again... oh well.
# 0.2.2 - added 'wince' to syscmd_ver() supported platforms
# 0.2.1 - added cache logic and changed the platform string format
# 0.2.0 - changed the API to use functions instead of module globals
# since some action take too long to be run on module import
# 0.1.0 - first release
#
# You can always get the latest version of this module at:
#
# http://www.egenix.com/files/python/platform.py
#
# If that URL should fail, try contacting the author.
__copyright__ = """
Copyright (c) 1999-2000, Marc-Andre Lemburg; mailto:mal@lemburg.com
Copyright (c) 2000-2010, eGenix.com Software GmbH; mailto:info@egenix.com
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee or royalty is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation or portions thereof, including modifications,
that you make.
EGENIX.COM SOFTWARE GMBH DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
WITH THE USE OR PERFORMANCE OF THIS SOFTWARE !
"""
__version__ = '1.0.7'
import collections
import sys, os, re, subprocess
import warnings
### Globals & Constants
# Determine the platform's /dev/null device
try:
DEV_NULL = os.devnull
except AttributeError:
# os.devnull was added in Python 2.4, so emulate it for earlier
# Python versions
if sys.platform in ('dos', 'win32', 'win16'):
# Use the old CP/M NUL as device name
DEV_NULL = 'NUL'
else:
# Standard Unix uses /dev/null
DEV_NULL = '/dev/null'
# Directory to search for configuration information on Unix.
# Constant used by test_platform to test linux_distribution().
_UNIXCONFDIR = '/etc'
### Platform specific APIs
_libc_search = re.compile(b'(__libc_init)'
b'|'
b'(GLIBC_([0-9.]+))'
b'|'
br'(libc(_\w+)?\.so(?:\.(\d[0-9.]*))?)', re.ASCII)
def libc_ver(executable=sys.executable, lib='', version='',
chunksize=16384):
""" Tries to determine the libc version that the file executable
(which defaults to the Python interpreter) is linked against.
Returns a tuple of strings (lib,version) which default to the
given parameters in case the lookup fails.
Note that the function has intimate knowledge of how different
libc versions add symbols to the executable and thus is probably
only useable for executables compiled using gcc.
The file is read and scanned in chunks of chunksize bytes.
"""
if hasattr(os.path, 'realpath'):
# Python 2.2 introduced os.path.realpath(); it is used
# here to work around problems with Cygwin not being
# able to open symlinks for reading
executable = os.path.realpath(executable)
with open(executable, 'rb') as f:
binary = f.read(chunksize)
pos = 0
while 1:
if b'libc' in binary or b'GLIBC' in binary:
m = _libc_search.search(binary, pos)
else:
m = None
if not m:
binary = f.read(chunksize)
if not binary:
break
pos = 0
continue
libcinit, glibc, glibcversion, so, threads, soversion = [
s.decode('latin1') if s is not None else s
for s in m.groups()]
if libcinit and not lib:
lib = 'libc'
elif glibc:
if lib != 'glibc':
lib = 'glibc'
version = glibcversion
elif glibcversion > version:
version = glibcversion
elif so:
if lib != 'glibc':
lib = 'libc'
if soversion and soversion > version:
version = soversion
if threads and version[-len(threads):] != threads:
version = version + threads
pos = m.end()
return lib, version
def _dist_try_harder(distname, version, id):
""" Tries some special tricks to get the distribution
information in case the default method fails.
Currently supports older SuSE Linux, Caldera OpenLinux and
Slackware Linux distributions.
"""
if os.path.exists('/var/adm/inst-log/info'):
# SuSE Linux stores distribution information in that file
distname = 'SuSE'
for line in open('/var/adm/inst-log/info'):
tv = line.split()
if len(tv) == 2:
tag, value = tv
else:
continue
if tag == 'MIN_DIST_VERSION':
version = value.strip()
elif tag == 'DIST_IDENT':
values = value.split('-')
id = values[2]
return distname, version, id
if os.path.exists('/etc/.installed'):
# Caldera OpenLinux has some infos in that file (thanks to Colin Kong)
for line in open('/etc/.installed'):
pkg = line.split('-')
if len(pkg) >= 2 and pkg[0] == 'OpenLinux':
# XXX does Caldera support non Intel platforms ? If yes,
# where can we find the needed id ?
return 'OpenLinux', pkg[1], id
if os.path.isdir('/usr/lib/setup'):
# Check for slackware version tag file (thanks to Greg Andruk)
verfiles = os.listdir('/usr/lib/setup')
for n in range(len(verfiles)-1, -1, -1):
if verfiles[n][:14] != 'slack-version-':
del verfiles[n]
if verfiles:
verfiles.sort()
distname = 'slackware'
version = verfiles[-1][14:]
return distname, version, id
return distname, version, id
_release_filename = re.compile(r'(\w+)[-_](release|version)', re.ASCII)
_lsb_release_version = re.compile(r'(.+)'
' release '
'([\d.]+)'
'[^(]*(?:\((.+)\))?', re.ASCII)
_release_version = re.compile(r'([^0-9]+)'
'(?: release )?'
'([\d.]+)'
'[^(]*(?:\((.+)\))?', re.ASCII)
# See also http://www.novell.com/coolsolutions/feature/11251.html
# and http://linuxmafia.com/faq/Admin/release-files.html
# and http://data.linux-ntfs.org/rpm/whichrpm
# and http://www.die.net/doc/linux/man/man1/lsb_release.1.html
_supported_dists = (
'SuSE', 'debian', 'fedora', 'redhat', 'centos',
'mandrake', 'mandriva', 'rocks', 'slackware', 'yellowdog', 'gentoo',
'UnitedLinux', 'turbolinux', 'arch', 'mageia')
def _parse_release_file(firstline):
# Default to empty 'version' and 'id' strings. Both defaults are used
# when 'firstline' is empty. 'id' defaults to empty when an id can not
# be deduced.
version = ''
id = ''
# Parse the first line
m = _lsb_release_version.match(firstline)
if m is not None:
# LSB format: "distro release x.x (codename)"
return tuple(m.groups())
# Pre-LSB format: "distro x.x (codename)"
m = _release_version.match(firstline)
if m is not None:
return tuple(m.groups())
# Unknown format... take the first two words
l = firstline.strip().split()
if l:
version = l[0]
if len(l) > 1:
id = l[1]
return '', version, id
def linux_distribution(distname='', version='', id='',
supported_dists=_supported_dists,
full_distribution_name=1):
import warnings
warnings.warn("dist() and linux_distribution() functions are deprecated "
"in Python 3.5", PendingDeprecationWarning, stacklevel=2)
return _linux_distribution(distname, version, id, supported_dists,
full_distribution_name)
def _linux_distribution(distname, version, id, supported_dists,
full_distribution_name):
""" Tries to determine the name of the Linux OS distribution name.
The function first looks for a distribution release file in
/etc and then reverts to _dist_try_harder() in case no
suitable files are found.
supported_dists may be given to define the set of Linux
distributions to look for. It defaults to a list of currently
supported Linux distributions identified by their release file
name.
If full_distribution_name is true (default), the full
distribution read from the OS is returned. Otherwise the short
name taken from supported_dists is used.
Returns a tuple (distname, version, id) which default to the
args given as parameters.
"""
try:
etc = os.listdir(_UNIXCONFDIR)
except OSError:
# Probably not a Unix system
return distname, version, id
etc.sort()
for file in etc:
m = _release_filename.match(file)
if m is not None:
_distname, dummy = m.groups()
if _distname in supported_dists:
distname = _distname
break
else:
return _dist_try_harder(distname, version, id)
# Read the first line
with open(os.path.join(_UNIXCONFDIR, file), 'r',
encoding='utf-8', errors='surrogateescape') as f:
firstline = f.readline()
_distname, _version, _id = _parse_release_file(firstline)
if _distname and full_distribution_name:
distname = _distname
if _version:
version = _version
if _id:
id = _id
return distname, version, id
# To maintain backwards compatibility:
def dist(distname='', version='', id='',
supported_dists=_supported_dists):
""" Tries to determine the name of the Linux OS distribution name.
The function first looks for a distribution release file in
/etc and then reverts to _dist_try_harder() in case no
suitable files are found.
Returns a tuple (distname, version, id) which default to the
args given as parameters.
"""
import warnings
warnings.warn("dist() and linux_distribution() functions are deprecated "
"in Python 3.5", PendingDeprecationWarning, stacklevel=2)
return _linux_distribution(distname, version, id,
supported_dists=supported_dists,
full_distribution_name=0)
def popen(cmd, mode='r', bufsize=-1):
""" Portable popen() interface.
"""
import warnings
warnings.warn('use os.popen instead', DeprecationWarning, stacklevel=2)
return os.popen(cmd, mode, bufsize)
def _norm_version(version, build=''):
""" Normalize the version and build strings and return a single
version string using the format major.minor.build (or patchlevel).
"""
l = version.split('.')
if build:
l.append(build)
try:
ints = map(int, l)
except ValueError:
strings = l
else:
strings = list(map(str, ints))
version = '.'.join(strings[:3])
return version
_ver_output = re.compile(r'(?:([\w ]+) ([\w.]+) '
'.*'
'\[.* ([\d.]+)\])')
# Examples of VER command output:
#
# Windows 2000: Microsoft Windows 2000 [Version 5.00.2195]
# Windows XP: Microsoft Windows XP [Version 5.1.2600]
# Windows Vista: Microsoft Windows [Version 6.0.6002]
#
# Note that the "Version" string gets localized on different
# Windows versions.
def _syscmd_ver(system='', release='', version='',
supported_platforms=('win32', 'win16', 'dos')):
""" Tries to figure out the OS version used and returns
a tuple (system, release, version).
It uses the "ver" shell command for this which is known
to exists on Windows, DOS. XXX Others too ?
In case this fails, the given parameters are used as
defaults.
"""
if sys.platform not in supported_platforms:
return system, release, version
# Try some common cmd strings
for cmd in ('ver', 'command /c ver', 'cmd /c ver'):
try:
pipe = os.popen(cmd)
info = pipe.read()
if pipe.close():
raise OSError('command failed')
# XXX How can I suppress shell errors from being written
# to stderr ?
except OSError as why:
#print 'Command %s failed: %s' % (cmd, why)
continue
else:
break
else:
return system, release, version
# Parse the output
info = info.strip()
m = _ver_output.match(info)
if m is not None:
system, release, version = m.groups()
# Strip trailing dots from version and release
if release[-1] == '.':
release = release[:-1]
if version[-1] == '.':
version = version[:-1]
# Normalize the version and build strings (eliminating additional
# zeros)
version = _norm_version(version)
return system, release, version
_WIN32_CLIENT_RELEASES = {
(5, 0): "2000",
(5, 1): "XP",
# Strictly, 5.2 client is XP 64-bit, but platform.py historically
# has always called it 2003 Server
(5, 2): "2003Server",
(5, None): "post2003",
(6, 0): "Vista",
(6, 1): "7",
(6, 2): "8",
(6, 3): "8.1",
(6, None): "post8.1",
(10, 0): "10",
(10, None): "post10",
}
# Server release name lookup will default to client names if necessary
_WIN32_SERVER_RELEASES = {
(5, 2): "2003Server",
(6, 0): "2008Server",
(6, 1): "2008ServerR2",
(6, 2): "2012Server",
(6, 3): "2012ServerR2",
(6, None): "post2012ServerR2",
}
if sys.platform == 'win32':
import ctypes
import ctypes.wintypes
class VS_FIXEDFILEINFO(ctypes.Structure):
_fields_ = [
("dwSignature", ctypes.wintypes.DWORD),
("dwStrucVersion", ctypes.wintypes.DWORD),
("dwFileVersionMS", ctypes.wintypes.DWORD),
("dwFileVersionLS", ctypes.wintypes.DWORD),
("dwProductVersionMS", ctypes.wintypes.DWORD),
("dwProductVersionLS", ctypes.wintypes.DWORD),
("dwFileFlagsMask", ctypes.wintypes.DWORD),
("dwFileFlags", ctypes.wintypes.DWORD),
("dwFileOS", ctypes.wintypes.DWORD),
("dwFileType", ctypes.wintypes.DWORD),
("dwFileSubtype", ctypes.wintypes.DWORD),
("dwFileDateMS", ctypes.wintypes.DWORD),
("dwFileDateLS", ctypes.wintypes.DWORD),
]
P_VS_FIXEDFILEINFO = ctypes.POINTER(VS_FIXEDFILEINFO)
def _get_real_winver(maj, min, build):
if maj < 6 or (maj == 6 and min < 2):
return maj, min, build
kernel32 = ctypes.WinDLL('kernel32')
# We will immediately double the length up to MAX_PATH, but the
# path may be longer, so we retry until the returned string is
# shorter than our buffer.
name_len = actual_len = 130
while actual_len == name_len:
name_len *= 2
name = ctypes.create_unicode_buffer(name_len)
actual_len = kernel32.GetModuleFileNameW(
ctypes.wintypes.HANDLE(kernel32._handle),
name, len(name)
)
if not actual_len:
return maj, min, build
version = ctypes.WinDLL('version')
size = version.GetFileVersionInfoSizeW(name, None)
if not size:
return maj, min, build
ver_block = ctypes.c_buffer(size)
if (not version.GetFileVersionInfoW(name, None, size, ver_block) or
not ver_block):
return maj, min, build
pvi = P_VS_FIXEDFILEINFO()
if not version.VerQueryValueW(ver_block, "",
ctypes.byref(pvi), ctypes.byref(ctypes.wintypes.DWORD())):
return maj, min, build
maj = pvi.contents.dwProductVersionMS >> 16
min = pvi.contents.dwProductVersionMS & 0xFFFF
build = pvi.contents.dwProductVersionLS >> 16
return maj, min, build
def win32_ver(release='', version='', csd='', ptype=''):
try:
from sys import getwindowsversion
except ImportError:
return release, version, csd, ptype
try:
from winreg import OpenKeyEx, QueryValueEx, CloseKey, HKEY_LOCAL_MACHINE
except ImportError:
from _winreg import OpenKeyEx, QueryValueEx, CloseKey, HKEY_LOCAL_MACHINE
winver = getwindowsversion()
maj, min, build = _get_real_winver(*winver[:3])
version = '{0}.{1}.{2}'.format(maj, min, build)
release = (_WIN32_CLIENT_RELEASES.get((maj, min)) or
_WIN32_CLIENT_RELEASES.get((maj, None)) or
release)
# getwindowsversion() reflect the compatibility mode Python is
# running under, and so the service pack value is only going to be
# valid if the versions match.
if winver[:2] == (maj, min):
try:
csd = 'SP{}'.format(winver.service_pack_major)
except AttributeError:
if csd[:13] == 'Service Pack ':
csd = 'SP' + csd[13:]
# VER_NT_SERVER = 3
if getattr(winver, 'product_type', None) == 3:
release = (_WIN32_SERVER_RELEASES.get((maj, min)) or
_WIN32_SERVER_RELEASES.get((maj, None)) or
release)
key = None
try:
key = OpenKeyEx(HKEY_LOCAL_MACHINE,
r'SOFTWARE\Microsoft\Windows NT\CurrentVersion')
ptype = QueryValueEx(key, 'CurrentType')[0]
except:
pass
finally:
if key:
CloseKey(key)
return release, version, csd, ptype
def _mac_ver_xml():
fn = '/System/Library/CoreServices/SystemVersion.plist'
if not os.path.exists(fn):
return None
try:
import plistlib
except ImportError:
return None
with open(fn, 'rb') as f:
pl = plistlib.load(f)
release = pl['ProductVersion']
versioninfo = ('', '', '')
machine = os.uname().machine
if machine in ('ppc', 'Power Macintosh'):
# Canonical name
machine = 'PowerPC'
return release, versioninfo, machine
def mac_ver(release='', versioninfo=('', '', ''), machine=''):
""" Get MacOS version information and return it as tuple (release,
versioninfo, machine) with versioninfo being a tuple (version,
dev_stage, non_release_version).
Entries which cannot be determined are set to the parameter values
which default to ''. All tuple entries are strings.
"""
# First try reading the information from an XML file which should
# always be present
info = _mac_ver_xml()
if info is not None:
return info
# If that also doesn't work return the default values
return release, versioninfo, machine
def _java_getprop(name, default):
from java.lang import System
try:
value = System.getProperty(name)
if value is None:
return default
return value
except AttributeError:
return default
def java_ver(release='', vendor='', vminfo=('', '', ''), osinfo=('', '', '')):
""" Version interface for Jython.
Returns a tuple (release, vendor, vminfo, osinfo) with vminfo being
a tuple (vm_name, vm_release, vm_vendor) and osinfo being a
tuple (os_name, os_version, os_arch).
Values which cannot be determined are set to the defaults
given as parameters (which all default to '').
"""
# Import the needed APIs
try:
import java.lang
except ImportError:
return release, vendor, vminfo, osinfo
vendor = _java_getprop('java.vendor', vendor)
release = _java_getprop('java.version', release)
vm_name, vm_release, vm_vendor = vminfo
vm_name = _java_getprop('java.vm.name', vm_name)
vm_vendor = _java_getprop('java.vm.vendor', vm_vendor)
vm_release = _java_getprop('java.vm.version', vm_release)
vminfo = vm_name, vm_release, vm_vendor
os_name, os_version, os_arch = osinfo
os_arch = _java_getprop('java.os.arch', os_arch)
os_name = _java_getprop('java.os.name', os_name)
os_version = _java_getprop('java.os.version', os_version)
osinfo = os_name, os_version, os_arch
return release, vendor, vminfo, osinfo
### System name aliasing
def system_alias(system, release, version):
""" Returns (system, release, version) aliased to common
marketing names used for some systems.
It also does some reordering of the information in some cases
where it would otherwise cause confusion.
"""
if system == 'Rhapsody':
# Apple's BSD derivative
# XXX How can we determine the marketing release number ?
return 'MacOS X Server', system+release, version
elif system == 'SunOS':
# Sun's OS
if release < '5':
# These releases use the old name SunOS
return system, release, version
# Modify release (marketing release = SunOS release - 3)
l = release.split('.')
if l:
try:
major = int(l[0])
except ValueError:
pass
else:
major = major - 3
l[0] = str(major)
release = '.'.join(l)
if release < '6':
system = 'Solaris'
else:
# XXX Whatever the new SunOS marketing name is...
system = 'Solaris'
elif system == 'IRIX64':
# IRIX reports IRIX64 on platforms with 64-bit support; yet it
# is really a version and not a different platform, since 32-bit
# apps are also supported..
system = 'IRIX'
if version:
version = version + ' (64bit)'
else:
version = '64bit'
elif system in ('win32', 'win16'):
# In case one of the other tricks
system = 'Windows'
return system, release, version
### Various internal helpers
def _platform(*args):
""" Helper to format the platform string in a filename
compatible format e.g. "system-version-machine".
"""
# Format the platform string
platform = '-'.join(x.strip() for x in filter(len, args))
# Cleanup some possible filename obstacles...
platform = platform.replace(' ', '_')
platform = platform.replace('/', '-')
platform = platform.replace('\\', '-')
platform = platform.replace(':', '-')
platform = platform.replace(';', '-')
platform = platform.replace('"', '-')
platform = platform.replace('(', '-')
platform = platform.replace(')', '-')
# No need to report 'unknown' information...
platform = platform.replace('unknown', '')
# Fold '--'s and remove trailing '-'
while 1:
cleaned = platform.replace('--', '-')
if cleaned == platform:
break
platform = cleaned
while platform[-1] == '-':
platform = platform[:-1]
return platform
def _node(default=''):
""" Helper to determine the node name of this machine.
"""
try:
import socket
except ImportError:
# No sockets...
return default
try:
return socket.gethostname()
except OSError:
# Still not working...
return default
def _follow_symlinks(filepath):
""" In case filepath is a symlink, follow it until a
real file is reached.
"""
filepath = os.path.abspath(filepath)
while os.path.islink(filepath):
filepath = os.path.normpath(
os.path.join(os.path.dirname(filepath), os.readlink(filepath)))
return filepath
def _syscmd_uname(option, default=''):
""" Interface to the system's uname command.
"""
if sys.platform in ('dos', 'win32', 'win16'):
# XXX Others too ?
return default
try:
f = os.popen('uname %s 2> %s' % (option, DEV_NULL))
except (AttributeError, OSError):
return default
output = f.read().strip()
rc = f.close()
if not output or rc:
return default
else:
return output
def _syscmd_file(target, default=''):
""" Interface to the system's file command.
The function uses the -b option of the file command to have it
omit the filename in its output. Follow the symlinks. It returns
default in case the command should fail.
"""
if sys.platform in ('dos', 'win32', 'win16'):
# XXX Others too ?
return default
target = _follow_symlinks(target)
try:
proc = subprocess.Popen(['file', target],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
except (AttributeError, OSError):
return default
output = proc.communicate()[0].decode('latin-1')
rc = proc.wait()
if not output or rc:
return default
else:
return output
### Information about the used architecture
# Default values for architecture; non-empty strings override the
# defaults given as parameters
_default_architecture = {
'win32': ('', 'WindowsPE'),
'win16': ('', 'Windows'),
'dos': ('', 'MSDOS'),
}
def architecture(executable=sys.executable, bits='', linkage=''):
""" Queries the given executable (defaults to the Python interpreter
binary) for various architecture information.
Returns a tuple (bits, linkage) which contains information about
the bit architecture and the linkage format used for the
executable. Both values are returned as strings.
Values that cannot be determined are returned as given by the
parameter presets. If bits is given as '', the sizeof(pointer)
(or sizeof(long) on Python version < 1.5.2) is used as
indicator for the supported pointer size.
The function relies on the system's "file" command to do the
actual work. This is available on most if not all Unix
platforms. On some non-Unix platforms where the "file" command
does not exist and the executable is set to the Python interpreter
binary defaults from _default_architecture are used.
"""
# Use the sizeof(pointer) as default number of bits if nothing
# else is given as default.
if not bits:
import struct
try:
size = struct.calcsize('P')
except struct.error:
# Older installations can only query longs
size = struct.calcsize('l')
bits = str(size*8) + 'bit'
# Get data from the 'file' system command
if executable:
fileout = _syscmd_file(executable, '')
else:
fileout = ''
if not fileout and \
executable == sys.executable:
# "file" command did not return anything; we'll try to provide
# some sensible defaults then...
if sys.platform in _default_architecture:
b, l = _default_architecture[sys.platform]
if b:
bits = b
if l:
linkage = l
return bits, linkage
if 'executable' not in fileout:
# Format not supported
return bits, linkage
# Bits
if '32-bit' in fileout:
bits = '32bit'
elif 'N32' in fileout:
# On Irix only
bits = 'n32bit'
elif '64-bit' in fileout:
bits = '64bit'
# Linkage
if 'ELF' in fileout:
linkage = 'ELF'
elif 'PE' in fileout:
# E.g. Windows uses this format
if 'Windows' in fileout:
linkage = 'WindowsPE'
else:
linkage = 'PE'
elif 'COFF' in fileout:
linkage = 'COFF'
elif 'MS-DOS' in fileout:
linkage = 'MSDOS'
else:
# XXX the A.OUT format also falls under this class...
pass
return bits, linkage
### Portable uname() interface
uname_result = collections.namedtuple("uname_result",
"system node release version machine processor")
_uname_cache = None
def uname():
""" Fairly portable uname interface. Returns a tuple
of strings (system, node, release, version, machine, processor)
identifying the underlying platform.
Note that unlike the os.uname function this also returns
possible processor information as an additional tuple entry.
Entries which cannot be determined are set to ''.
"""
global _uname_cache
no_os_uname = 0
if _uname_cache is not None:
return _uname_cache
processor = ''
# Get some infos from the builtin os.uname API...
try:
system, node, release, version, machine = os.uname()
except AttributeError:
no_os_uname = 1
if no_os_uname or not list(filter(None, (system, node, release, version, machine))):
# Hmm, no there is either no uname or uname has returned
#'unknowns'... we'll have to poke around the system then.
if no_os_uname:
system = sys.platform
release = ''
version = ''
node = _node()
machine = ''
use_syscmd_ver = 1
# Try win32_ver() on win32 platforms
if system == 'win32':
release, version, csd, ptype = win32_ver()
if release and version:
use_syscmd_ver = 0
# Try to use the PROCESSOR_* environment variables
# available on Win XP and later; see
# http://support.microsoft.com/kb/888731 and
# http://www.geocities.com/rick_lively/MANUALS/ENV/MSWIN/PROCESSI.HTM