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import os
import re
import stat
import subprocess
import sys
from collections import defaultdict
from textwrap import dedent
def get_executable(prog, hint, optional=False):
'''Search for @prog in system PATH. Print @hint if no binary is found.'''
def is_exe(fpath):
return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
fpath, fname = os.path.split(prog)
if fpath:
if is_exe(prog):
return prog
else:
for path in os.environ["PATH"].split(os.pathsep):
exe_file = os.path.join(path, prog)
if is_exe(exe_file):
return exe_file
if not optional:
sys.stderr.write("Cannot find executable '%s' in PATH. This is a part "
"of '%s' which should be added to PATH to run.\n" %
(prog, hint))
sys.exit(1)
else:
return None
def get_config_option(option):
'''Search for @option in installed kernel config (if present).
Raise an IOError if the kernel config isn't found in /boot/.'''
uname = subprocess.check_output(["uname", "-r"]).strip()
fname = "/boot/config-%s" % uname
if os.path.exists(fname):
config_regex = "^CONFIG_{}=(?P<val>.*)$".format(option)
with open(fname, 'r') as f:
data = f.read()
match = re.search(config_regex, data, re.M)
if not match:
return None
else:
return match.group("val")
else:
raise IOError("No config file exists!")
def recordtype(typename, field_names, default=0):
''' Mutable namedtuple. Recipe from George Sakkis of MIT.'''
field_names = tuple(map(str, field_names))
# Create and fill-in the class template
numfields = len(field_names)
argtxt = ', '.join(field_names)
reprtxt = ', '.join('%s=%%r' % f for f in field_names)
dicttxt = ', '.join('%r: self.%s' % (f,f) for f in field_names)
tupletxt = repr(tuple('self.%s' % f for f in field_names)).replace("'",'')
inittxt = '; '.join('self.%s=%s' % (f,f) for f in field_names)
itertxt = '; '.join('yield self.%s' % f for f in field_names)
eqtxt = ' and '.join('self.%s==other.%s' % (f,f) for f in field_names)
template = dedent('''
class %(typename)s(object):
'%(typename)s(%(argtxt)s)'
__slots__ = %(field_names)r
def __init__(self, %(argtxt)s):
%(inittxt)s
def __len__(self):
return %(numfields)d
def __iter__(self):
%(itertxt)s
def __getitem__(self, index):
return getattr(self, self.__slots__[index])
def __setitem__(self, index, value):
return setattr(self, self.__slots__[index], value)
def todict(self):
'Return a new dict which maps field names to their values'
return {%(dicttxt)s}
def __repr__(self):
return '%(typename)s(%(reprtxt)s)' %% %(tupletxt)s
def __eq__(self, other):
return isinstance(other, self.__class__) and %(eqtxt)s
def __ne__(self, other):
return not self==other
def __getstate__(self):
return %(tupletxt)s
def __setstate__(self, state):
%(tupletxt)s = state
''') % locals()
# Execute the template string in a temporary namespace
namespace = {}
try:
exec template in namespace
except SyntaxError as e:
raise SyntaxError(e.message + ':\n' + template)
cls = namespace[typename]
# Setup defaults
init_defaults = tuple(default for f in field_names)
cls.__init__.im_func.func_defaults = init_defaults
# For pickling to work, the __module__ variable needs to be set to the frame
# where the named tuple is created. Bypass this step in environments where
# sys._getframe is not defined (Jython for example).
if hasattr(sys, '_getframe') and sys.platform != 'cli':
cls.__module__ = sys._getframe(1).f_globals['__name__']
return cls
def load_params(fname):
params = defaultdict(int)
with open(fname, 'r') as f:
data = f.read()
try:
parsed = eval(data)
# Convert to defaultdict
for k in parsed:
params[k] = str(parsed[k])
except Exception as e:
raise IOError("Invalid param file: %s\n%s" % (fname, e))
return params
def num_cpus():
'''Return the number of CPUs in the system.'''
lnx_re = re.compile(r'^(processor|online)')
cpus = 0
with open('/proc/cpuinfo', 'r') as f:
for line in f:
if lnx_re.match(line):
cpus += 1
return cpus
def ft_freq():
umachine = subprocess.check_output(["uname", "-m"])
if re.match("armv7", umachine):
# Arm V7s use a millisecond timer
freq = 1000.0
elif re.match("x86", umachine):
# X86 timer is equal to processor clock
reg = re.compile(r'^cpu MHz\s*:\s*(?P<FREQ>\d+)', re.M)
with open('/proc/cpuinfo', 'r') as f:
data = f.read()
match = re.search(reg, data)
if not match:
raise Exception("Cannot parse CPU frequency from x86 CPU!")
freq = int(match.group('FREQ'))
else:
# You're on your own
freq = 0
return freq
def uname_matches(reg):
data = subprocess.check_output(["uname", "-r"])
return bool( re.match(reg, data) )
def is_executable(fname):
'''Return whether the file passed in is executable'''
mode = os.stat(fname)[stat.ST_MODE]
return mode & stat.S_IXUSR and mode & stat.S_IRUSR
def is_device(dev):
if not os.path.exists(dev):
return False
mode = os.stat(dev)[stat.ST_MODE]
return not (not mode & stat.S_IFCHR)
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