diff options
Diffstat (limited to 'engine/SCons/Util.py')
| -rw-r--r-- | engine/SCons/Util.py | 102 |
1 files changed, 53 insertions, 49 deletions
diff --git a/engine/SCons/Util.py b/engine/SCons/Util.py index 476f5d8..5b4c225 100644 --- a/engine/SCons/Util.py +++ b/engine/SCons/Util.py @@ -24,7 +24,7 @@ Various utility functions go here. # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -__revision__ = "src/engine/SCons/Util.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan" +__revision__ = "src/engine/SCons/Util.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan" import os import sys @@ -33,6 +33,7 @@ import re import types import codecs import pprint +import hashlib PY3 = sys.version_info[0] == 3 @@ -656,13 +657,15 @@ except ImportError: pass RegError = _NoError -WinError = None + # Make sure we have a definition of WindowsError so we can # run platform-independent tests of Windows functionality on # platforms other than Windows. (WindowsError is, in fact, an # OSError subclass on Windows.) + class PlainWindowsError(OSError): pass + try: WinError = WindowsError except NameError: @@ -676,7 +679,7 @@ if can_read_reg: HKEY_USERS = hkey_mod.HKEY_USERS def RegGetValue(root, key): - """This utility function returns a value in the registry + r"""This utility function returns a value in the registry without having to open the key first. Only available on Windows platforms with a version of Python that can read the registry. Returns the same thing as @@ -883,7 +886,7 @@ def PrependPath(oldpath, newpath, sep = os.pathsep, # now we add them only if they are unique for path in newpaths: normpath = os.path.normpath(os.path.normcase(path)) - if path and not normpath in normpaths: + if path and normpath not in normpaths: paths.append(path) normpaths.append(normpath) @@ -963,7 +966,7 @@ def AppendPath(oldpath, newpath, sep = os.pathsep, # now we add them only if they are unique for path in newpaths: normpath = os.path.normpath(os.path.normcase(path)) - if path and not normpath in normpaths: + if path and normpath not in normpaths: paths.append(path) normpaths.append(normpath) paths.reverse() @@ -999,7 +1002,9 @@ if sys.platform == 'cygwin': def get_native_path(path): """Transforms an absolute path into a native path for the system. In Cygwin, this converts from a Cygwin path to a Windows one.""" - return os.popen('cygpath -w ' + path).read().replace('\n', '') + with os.popen('cygpath -w ' + path) as p: + npath = p.read().replace('\n', '') + return npath else: def get_native_path(path): """Transforms an absolute path into a native path for the system. @@ -1176,10 +1181,13 @@ def unique(s): # ASPN: Python Cookbook: Remove duplicates from a sequence # First comment, dated 2001/10/13. # (Also in the printed Python Cookbook.) +# This not currently used, in favor of the next function... def uniquer(seq, idfun=None): - if idfun is None: - def idfun(x): return x + def default_idfun(x): + return x + if not idfun: + idfun = default_idfun seen = {} result = [] for item in seq: @@ -1444,56 +1452,53 @@ def RenameFunction(function, name): function.__defaults__) -md5 = False - +if hasattr(hashlib, 'md5'): + md5 = True -def MD5signature(s): - return str(s) + def MD5signature(s): + """ + Generate md5 signature of a string + :param s: either string or bytes. Normally should be bytes + :return: String of hex digits representing the signature + """ + m = hashlib.md5() -def MD5filesignature(fname, chunksize=65536): - with open(fname, "rb") as f: - result = f.read() - return result + try: + m.update(to_bytes(s)) + except TypeError as e: + m.update(to_bytes(str(s))) -try: - import hashlib -except ImportError: - pass -else: - if hasattr(hashlib, 'md5'): - md5 = True + return m.hexdigest() - def MD5signature(s): - """ - Generate a String of Hex digits representing the md5 signature of the string - :param s: either string or bytes. Normally should be bytes - :return: String of hex digits - """ - m = hashlib.md5() + def MD5filesignature(fname, chunksize=65536): + """ + Generate the md5 signature of a file - try: - m.update(to_bytes(s)) - except TypeError as e: - m.update(to_bytes(str(s))) - - return m.hexdigest() - - def MD5filesignature(fname, chunksize=65536): - """ - :param fname: - :param chunksize: - :return: String of Hex digits - """ - m = hashlib.md5() - f = open(fname, "rb") + :param fname: file to hash + :param chunksize: chunk size to read + :return: String of Hex digits representing the signature + """ + m = hashlib.md5() + with open(fname, "rb") as f: while True: blck = f.read(chunksize) if not blck: break m.update(to_bytes(blck)) - f.close() - return m.hexdigest() + return m.hexdigest() +else: + # if md5 algorithm not available, just return data unmodified + # could add alternative signature scheme here + md5 = False + + def MD5signature(s): + return str(s) + + def MD5filesignature(fname, chunksize=65536): + with open(fname, "rb") as f: + result = f.read() + return result def MD5collect(signatures): @@ -1509,7 +1514,6 @@ def MD5collect(signatures): return MD5signature(', '.join(signatures)) - def silent_intern(x): """ Perform sys.intern() on the passed argument and return the result. @@ -1533,7 +1537,7 @@ def silent_intern(x): class Null(object): """ Null objects always and reliably "do nothing." """ def __new__(cls, *args, **kwargs): - if not '_instance' in vars(cls): + if '_instance' not in vars(cls): cls._instance = super(Null, cls).__new__(cls, *args, **kwargs) return cls._instance def __init__(self, *args, **kwargs): |