waf/waflib/Utils.py

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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005-2010 (ita)
"""
Utilities and platform-specific fixes
The portability fixes try to provide a consistent behavior of the Waf API
through Python versions 2.5 to 3.X and across different platforms (win32, linux, etc)
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"""
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import os, sys, errno, traceback, inspect, re, shutil, datetime, platform, base64
try:
import cPickle
except ImportError:
import pickle as cPickle
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# leave this
if os.name == 'posix' and sys.version_info[0] < 3:
try:
import subprocess32 as subprocess
except ImportError:
import subprocess
else:
import subprocess
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from collections import deque, defaultdict
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try:
import _winreg as winreg
except ImportError:
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try:
import winreg
except ImportError:
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winreg = None
from waflib import Errors
try:
from hashlib import md5
except ImportError:
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try:
from md5 import md5
except ImportError:
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# never fail to enable fixes from another module
pass
try:
import threading
except ImportError:
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if not 'JOBS' in os.environ:
# no threading :-(
os.environ['JOBS'] = '1'
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class threading(object):
"""
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A fake threading class for platforms lacking the threading module.
Use ``waf -j1`` on those platforms
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"""
pass
class Lock(object):
"""Fake Lock class"""
def acquire(self):
pass
def release(self):
pass
threading.Lock = threading.Thread = Lock
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SIG_NIL = 'SIG_NIL_SIG_NIL_'.encode()
"""Arbitrary null value for hashes. Modify this value according to the hash function in use"""
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O644 = 420
"""Constant representing the permissions for regular files (0644 raises a syntax error on python 3)"""
O755 = 493
"""Constant representing the permissions for executable files (0755 raises a syntax error on python 3)"""
rot_chr = ['\\', '|', '/', '-']
"List of characters to use when displaying the throbber (progress bar)"
rot_idx = 0
"Index of the current throbber character (progress bar)"
class ordered_iter_dict(dict):
"""An ordered dictionary that provides iteration from the most recently inserted keys first"""
def __init__(self, *k, **kw):
self.lst = deque()
dict.__init__(self, *k, **kw)
def clear(self):
dict.clear(self)
self.lst = deque()
def __setitem__(self, key, value):
if key in dict.keys(self):
self.lst.remove(key)
dict.__setitem__(self, key, value)
self.lst.append(key)
def __delitem__(self, key):
dict.__delitem__(self, key)
try:
self.lst.remove(key)
except ValueError:
pass
def __iter__(self):
return reversed(self.lst)
def keys(self):
return reversed(self.lst)
class lru_node(object):
__slots__ = ('next', 'prev', 'key', 'val')
def __init__(self):
self.next = self
self.prev = self
self.key = None
self.val = None
class lru_cache(object):
"""A simple least-recently used cache that suits our purposes"""
__slots__ = ('maxlen', 'table', 'head')
def __init__(self, maxlen=100):
self.maxlen = maxlen
self.table = {}
self.head = lru_node()
for x in range(maxlen - 1):
node = lru_node()
node.prev = self.head.prev
node.next = self.head
node.prev.next = node
node.next.prev = node
def __getitem__(self, key):
node = self.table[key]
# assert(key==node.key)
if node is self.head:
return node.val
# detach the node found
node.prev.next = node.next
node.next.prev = node.prev
# replace the head
node.next = self.head.next
node.prev = self.head
node.next.prev = node
node.prev.next = node
self.head = node
return node.val
def __setitem__(self, key, val):
# go past the head
node = self.head = self.head.next
try:
# remove existing keys if present
del self.table[node.key]
except KeyError:
pass
node.key = key
node.val = val
self.table[key] = node
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is_win32 = os.sep == '\\' or sys.platform == 'win32' # msys2
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def readf(fname, m='r', encoding='ISO8859-1'):
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"""
Read an entire file into a string, use this function instead of os.open() whenever possible.
In practice the wrapper node.read(..) should be preferred to this function::
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def build(ctx):
from waflib import Utils
txt = Utils.readf(self.path.find_node('wscript').abspath())
txt = ctx.path.find_node('wscript').read()
:type fname: string
:param fname: Path to file
:type m: string
:param m: Open mode
:type encoding: string
:param encoding: encoding value, only used for python 3
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:rtype: string
:return: Content of the file
"""
if sys.hexversion > 0x3000000 and not 'b' in m:
m += 'b'
f = open(fname, m)
try:
txt = f.read()
finally:
f.close()
if encoding:
txt = txt.decode(encoding)
else:
txt = txt.decode()
else:
f = open(fname, m)
try:
txt = f.read()
finally:
f.close()
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return txt
def writef(fname, data, m='w', encoding='ISO8859-1'):
"""
Write an entire file from a string, use this function instead of os.open() whenever possible.
In practice the wrapper node.write(..) should be preferred to this function::
def build(ctx):
from waflib import Utils
txt = Utils.writef(self.path.make_node('i_like_kittens').abspath(), 'some data')
self.path.make_node('i_like_kittens').write('some data')
:type fname: string
:param fname: Path to file
:type data: string
:param data: The contents to write to the file
:type m: string
:param m: Open mode
:type encoding: string
:param encoding: encoding value, only used for python 3
"""
if sys.hexversion > 0x3000000 and not 'b' in m:
data = data.encode(encoding)
m += 'b'
f = open(fname, m)
try:
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f.write(data)
finally:
f.close()
def h_file(fname):
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"""
Compute a hash value for a file by using md5. This method may be replaced by
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a faster version if necessary. The following uses the file size and the timestamp value.
The performance change can be 0.858s to 0.642s on no-op builds::
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import stat
from waflib import Utils
def h_file(fname):
st = os.stat(fname)
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if stat.S_ISDIR(st[stat.ST_MODE]): raise OSError('not a file')
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s = "%s%s%s" % (st.st_mtime, st.st_size, fname)
return Utils.md5(s.encode()).digest()
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Utils.h_file = h_file
:type fname: string
:param fname: path to the file to hash
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:return: hash of the file contents
"""
f = open(fname, 'rb')
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m = md5()
try:
while fname:
fname = f.read(200000)
m.update(fname)
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finally:
f.close()
return m.digest()
def readf_win32(f, m='r', encoding='ISO8859-1'):
flags = os.O_NOINHERIT | os.O_RDONLY
if 'b' in m:
flags |= os.O_BINARY
if '+' in m:
flags |= os.O_RDWR
try:
fd = os.open(f, flags)
except OSError:
raise IOError('Cannot read from %r' % f)
if sys.hexversion > 0x3000000 and not 'b' in m:
m += 'b'
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f = os.fdopen(fd, m)
try:
txt = f.read()
finally:
f.close()
if encoding:
txt = txt.decode(encoding)
else:
txt = txt.decode()
else:
f = os.fdopen(fd, m)
try:
txt = f.read()
finally:
f.close()
return txt
def writef_win32(f, data, m='w', encoding='ISO8859-1'):
if sys.hexversion > 0x3000000 and not 'b' in m:
data = data.encode(encoding)
m += 'b'
flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | os.O_NOINHERIT
if 'b' in m:
flags |= os.O_BINARY
if '+' in m:
flags |= os.O_RDWR
try:
fd = os.open(f, flags)
except OSError:
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raise OSError('Cannot write to %r' % f)
f = os.fdopen(fd, m)
try:
f.write(data)
finally:
f.close()
def h_file_win32(fname):
try:
fd = os.open(fname, os.O_BINARY | os.O_RDONLY | os.O_NOINHERIT)
except OSError:
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raise OSError('Cannot read from %r' % fname)
f = os.fdopen(fd, 'rb')
m = md5()
try:
while fname:
fname = f.read(200000)
m.update(fname)
finally:
f.close()
return m.digest()
# always save these
readf_unix = readf
writef_unix = writef
h_file_unix = h_file
if hasattr(os, 'O_NOINHERIT') and sys.hexversion < 0x3040000:
# replace the default functions
readf = readf_win32
writef = writef_win32
h_file = h_file_win32
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try:
x = ''.encode('hex')
except LookupError:
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import binascii
def to_hex(s):
ret = binascii.hexlify(s)
if not isinstance(ret, str):
ret = ret.decode('utf-8')
return ret
else:
def to_hex(s):
return s.encode('hex')
to_hex.__doc__ = """
Return the hexadecimal representation of a string
:param s: string to convert
:type s: string
"""
def listdir_win32(s):
"""
List the contents of a folder in a portable manner.
On Win32, return the list of drive letters: ['C:', 'X:', 'Z:']
:type s: string
:param s: a string, which can be empty on Windows
"""
if not s:
try:
import ctypes
except ImportError:
# there is nothing much we can do
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return [x + ':\\' for x in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ']
else:
dlen = 4 # length of "?:\\x00"
maxdrives = 26
buf = ctypes.create_string_buffer(maxdrives * dlen)
ndrives = ctypes.windll.kernel32.GetLogicalDriveStringsA(maxdrives*dlen, ctypes.byref(buf))
return [ str(buf.raw[4*i:4*i+2].decode('ascii')) for i in range(int(ndrives/dlen)) ]
if len(s) == 2 and s[1] == ":":
s += os.sep
if not os.path.isdir(s):
e = OSError('%s is not a directory' % s)
e.errno = errno.ENOENT
raise e
return os.listdir(s)
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listdir = os.listdir
if is_win32:
listdir = listdir_win32
def num2ver(ver):
"""
Convert a string, tuple or version number into an integer. The number is supposed to have at most 4 digits::
from waflib.Utils import num2ver
num2ver('1.3.2') == num2ver((1,3,2)) == num2ver((1,3,2,0))
:type ver: string or tuple of numbers
:param ver: a version number
"""
if isinstance(ver, str):
ver = tuple(ver.split('.'))
if isinstance(ver, tuple):
ret = 0
for i in range(4):
if i < len(ver):
ret += 256**(3 - i) * int(ver[i])
return ret
return ver
def ex_stack():
"""
Extract the stack to display exceptions
Deprecated: use traceback.format_exc()
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:return: a string represening the last exception
"""
# TODO remove in waf 2.0
return traceback.format_exc()
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def to_list(sth):
"""
Convert a string argument to a list by splitting on spaces, and pass
through a list argument unchanged::
from waflib.Utils import to_list
lst = to_list("a b c d")
:param sth: List or a string of items separated by spaces
:rtype: list
:return: Argument converted to list
"""
if isinstance(sth, str):
return sth.split()
else:
return sth
def split_path_unix(path):
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return path.split('/')
def split_path_cygwin(path):
if path.startswith('//'):
ret = path.split('/')[2:]
ret[0] = '/' + ret[0]
return ret
return path.split('/')
re_sp = re.compile('[/\\\\]+')
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def split_path_win32(path):
if path.startswith('\\\\'):
ret = re_sp.split(path)[2:]
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ret[0] = '\\' + ret[0]
return ret
return re_sp.split(path)
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msysroot = None
def split_path_msys(path):
if path.startswith(('/', '\\')) and not path.startswith(('\\', '\\\\')):
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# msys paths can be in the form /usr/bin
global msysroot
if not msysroot:
# msys has python 2.7 or 3, so we can use this
msysroot = subprocess.check_output(['cygpath', '-w', '/']).decode(sys.stdout.encoding or 'iso8859-1')
msysroot = msysroot.strip()
path = os.path.normpath(msysroot + os.sep + path)
return split_path_win32(path)
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if sys.platform == 'cygwin':
split_path = split_path_cygwin
elif is_win32:
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if os.environ.get('MSYSTEM'):
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split_path = split_path_msys
else:
split_path = split_path_win32
else:
split_path = split_path_unix
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split_path.__doc__ = """
Split a path by / or \\. This function is not like os.path.split
:type path: string
:param path: path to split
:return: list of strings
"""
def check_dir(path):
"""
Ensure that a directory exists (similar to ``mkdir -p``).
:type path: string
:param path: Path to directory
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"""
if not os.path.isdir(path):
try:
os.makedirs(path)
except OSError as e:
if not os.path.isdir(path):
raise Errors.WafError('Cannot create the folder %r' % path, ex=e)
def check_exe(name, env=None):
"""
Ensure that a program exists
:type name: string
:param name: name or path to program
:return: path of the program or None
"""
if not name:
raise ValueError('Cannot execute an empty string!')
def is_exe(fpath):
return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
fpath, fname = os.path.split(name)
if fpath and is_exe(name):
return os.path.abspath(name)
else:
env = env or os.environ
for path in env["PATH"].split(os.pathsep):
path = path.strip('"')
exe_file = os.path.join(path, name)
if is_exe(exe_file):
return os.path.abspath(exe_file)
return None
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def def_attrs(cls, **kw):
"""
Set default attributes on a class instance
:type cls: class
:param cls: the class to update the given attributes in.
:type kw: dict
:param kw: dictionary of attributes names and values.
"""
for k, v in kw.items():
if not hasattr(cls, k):
setattr(cls, k, v)
def quote_define_name(s):
"""
Convert a string to an identifier suitable for C defines.
:type s: string
:param s: String to convert
:rtype: string
:return: Identifier suitable for C defines
"""
fu = re.sub('[^a-zA-Z0-9]', '_', s)
fu = re.sub('_+', '_', fu)
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fu = fu.upper()
return fu
def h_list(lst):
"""
Hash lists. For tuples, using hash(tup) is much more efficient,
except on python >= 3.3 where hash randomization assumes everybody is running a web application.
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:param lst: list to hash
:type lst: list of strings
:return: hash of the list
"""
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return md5(repr(lst).encode()).digest()
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def h_fun(fun):
"""
Hash functions
:param fun: function to hash
:type fun: function
:return: hash of the function
"""
try:
return fun.code
except AttributeError:
try:
h = inspect.getsource(fun)
except IOError:
h = "nocode"
try:
fun.code = h
except AttributeError:
pass
return h
def h_cmd(ins):
"""
Task command hashes are calculated by calling this function. The inputs can be
strings, functions, tuples/lists containing strings/functions
"""
# this function is not meant to be particularly fast
if isinstance(ins, str):
# a command is either a string
ret = ins
elif isinstance(ins, list) or isinstance(ins, tuple):
# or a list of functions/strings
ret = str([h_cmd(x) for x in ins])
else:
# or just a python function
ret = str(h_fun(ins))
if sys.hexversion > 0x3000000:
ret = ret.encode('iso8859-1', 'xmlcharrefreplace')
return ret
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reg_subst = re.compile(r"(\\\\)|(\$\$)|\$\{([^}]+)\}")
def subst_vars(expr, params):
"""
Replace ${VAR} with the value of VAR taken from a dict or a config set::
from waflib import Utils
s = Utils.subst_vars('${PREFIX}/bin', env)
:type expr: string
:param expr: String to perform substitution on
:param params: Dictionary or config set to look up variable values.
"""
def repl_var(m):
if m.group(1):
return '\\'
if m.group(2):
return '$'
try:
# ConfigSet instances may contain lists
return params.get_flat(m.group(3))
except AttributeError:
return params[m.group(3)]
# if you get a TypeError, it means that 'expr' is not a string...
# Utils.subst_vars(None, env) will not work
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return reg_subst.sub(repl_var, expr)
def destos_to_binfmt(key):
"""
Return the binary format based on the unversioned platform name.
:param key: platform name
:type key: string
:return: string representing the binary format
"""
if key == 'darwin':
return 'mac-o'
elif key in ('win32', 'cygwin', 'uwin', 'msys'):
return 'pe'
return 'elf'
def unversioned_sys_platform():
"""
Return the unversioned platform name.
Some Python platform names contain versions, that depend on
the build environment, e.g. linux2, freebsd6, etc.
This returns the name without the version number. Exceptions are
os2 and win32, which are returned verbatim.
:rtype: string
:return: Unversioned platform name
"""
s = sys.platform
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if s.startswith('java'):
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# The real OS is hidden under the JVM.
from java.lang import System
s = System.getProperty('os.name')
# see http://lopica.sourceforge.net/os.html for a list of possible values
if s == 'Mac OS X':
return 'darwin'
elif s.startswith('Windows '):
return 'win32'
elif s == 'OS/2':
return 'os2'
elif s == 'HP-UX':
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return 'hp-ux'
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elif s in ('SunOS', 'Solaris'):
return 'sunos'
else: s = s.lower()
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# powerpc == darwin for our purposes
if s == 'powerpc':
return 'darwin'
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if s == 'win32' or s == 'os2':
return s
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if s == 'cli' and os.name == 'nt':
# ironpython is only on windows as far as we know
return 'win32'
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return re.split('\d+$', s)[0]
def nada(*k, **kw):
"""
A function that does nothing
:return: None
"""
pass
class Timer(object):
"""
Simple object for timing the execution of commands.
Its string representation is the current time::
from waflib.Utils import Timer
timer = Timer()
a_few_operations()
s = str(timer)
"""
def __init__(self):
self.start_time = datetime.datetime.utcnow()
def __str__(self):
delta = datetime.datetime.utcnow() - self.start_time
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days = delta.days
hours, rem = divmod(delta.seconds, 3600)
minutes, seconds = divmod(rem, 60)
seconds += delta.microseconds * 1e-6
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result = ''
if days:
result += '%dd' % days
if days or hours:
result += '%dh' % hours
if days or hours or minutes:
result += '%dm' % minutes
return '%s%.3fs' % (result, seconds)
def read_la_file(path):
"""
Read property files, used by msvc.py
:param path: file to read
:type path: string
"""
sp = re.compile(r'^([^=]+)=\'(.*)\'$')
dc = {}
for line in readf(path).splitlines():
try:
_, left, right, _ = sp.split(line.strip())
dc[left] = right
except ValueError:
pass
return dc
def run_once(fun):
"""
Decorator: let a function cache its results, use like this::
@run_once
def foo(k):
return 345*2343
:param fun: function to execute
:type fun: function
:return: the return value of the function executed
"""
cache = {}
def wrap(*k):
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try:
return cache[k]
except KeyError:
ret = fun(*k)
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cache[k] = ret
return ret
wrap.__cache__ = cache
wrap.__name__ = fun.__name__
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return wrap
def get_registry_app_path(key, filename):
if not winreg:
return None
try:
result = winreg.QueryValue(key, "Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\%s.exe" % filename[0])
except WindowsError:
pass
else:
if os.path.isfile(result):
return result
def lib64():
# default settings for /usr/lib
if os.sep == '/':
if platform.architecture()[0] == '64bit':
if os.path.exists('/usr/lib64') and not os.path.exists('/usr/lib32'):
return '64'
return ''
def sane_path(p):
# private function for the time being!
return os.path.abspath(os.path.expanduser(p))
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process_pool = []
def get_process():
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try:
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return process_pool.pop()
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except IndexError:
filepath = os.path.dirname(os.path.abspath(__file__)) + os.sep + 'processor.py'
cmd = [sys.executable, '-c', readf(filepath)]
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return subprocess.Popen(cmd, stdout=subprocess.PIPE, stdin=subprocess.PIPE, bufsize=0)
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def run_prefork_process(cmd, kwargs, cargs):
obj = base64.b64encode(cPickle.dumps([cmd, kwargs, cargs]))
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proc = get_process()
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if not proc:
return run_regular_process(cmd, kwargs, cargs)
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proc.stdin.write(obj)
proc.stdin.write('\n'.encode())
proc.stdin.flush()
obj = proc.stdout.readline()
if not obj:
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raise OSError('Preforked sub-process %r died' % proc.pid)
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process_pool.append(proc)
ret, out, err, ex, trace = cPickle.loads(base64.b64decode(obj))
if ex:
if ex == 'OSError':
raise OSError(trace)
elif ex == 'ValueError':
raise ValueError(trace)
else:
raise Exception(trace)
return ret, out, err
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def run_regular_process(cmd, kwargs, cargs={}):
proc = subprocess.Popen(cmd, **kwargs)
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if kwargs.get('stdout') or kwargs.get('stderr'):
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out, err = proc.communicate(**cargs)
status = proc.returncode
else:
out, err = (None, None)
status = proc.wait(**cargs)
return status, out, err
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def run_process(cmd, kwargs, cargs={}):
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if kwargs.get('stdout') and kwargs.get('stderr'):
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return run_prefork_process(cmd, kwargs, cargs)
else:
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return run_regular_process(cmd, kwargs, cargs)
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def alloc_process_pool(n, force=False):
# mandatory on python2, unnecessary on python >= 3.2
global run_process, get_process, alloc_process_pool
if not force:
n = max(n - len(process_pool), 0)
try:
lst = [get_process() for x in range(n)]
except OSError:
run_process = run_regular_process
get_process = alloc_process_pool = nada
else:
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for x in lst:
process_pool.append(x)
if sys.platform == 'cli' or not sys.executable:
run_process = run_regular_process
get_process = alloc_process_pool = nada