Update compileall from 3.13.5 (RustPython#5914)

Author: ShaharNaveh

Lib/compileall.py

@@ -97,9 +97,15 @@ def compile_dir(dir, maxlevels=None, ddir=None, force=False,
     files = _walk_dir(dir, quiet=quiet, maxlevels=maxlevels)
     success = True
     if workers != 1 and ProcessPoolExecutor is not None:
+        import multiprocessing
+        if multiprocessing.get_start_method() == 'fork':
+            mp_context = multiprocessing.get_context('forkserver')
+        else:
+            mp_context = None
         # If workers == 0, let ProcessPoolExecutor choose
         workers = workers or None
-        with ProcessPoolExecutor(max_workers=workers) as executor:
+        with ProcessPoolExecutor(max_workers=workers,
+                                 mp_context=mp_context) as executor:
             results = executor.map(partial(compile_file,
                                            ddir=ddir, force=force,
                                            rx=rx, quiet=quiet,
@@ -110,7 +116,8 @@ def compile_dir(dir, maxlevels=None, ddir=None, force=False,
                                            prependdir=prependdir,
                                            limit_sl_dest=limit_sl_dest,
                                            hardlink_dupes=hardlink_dupes),
-                                   files)
+                                   files,
+                                   chunksize=4)
             success = min(results, default=True)
     else:
         for file in files:
@@ -166,13 +173,13 @@ def compile_file(fullname, ddir=None, force=False, rx=None, quiet=0,
     if stripdir is not None:
         fullname_parts = fullname.split(os.path.sep)
         stripdir_parts = stripdir.split(os.path.sep)
-        ddir_parts = list(fullname_parts)
-
-        for spart, opart in zip(stripdir_parts, fullname_parts):
-            if spart == opart:
-                ddir_parts.remove(spart)
 
-        dfile = os.path.join(*ddir_parts)
+        if stripdir_parts != fullname_parts[:len(stripdir_parts)]:
+            if quiet < 2:
+                print("The stripdir path {!r} is not a valid prefix for "
+                      "source path {!r}; ignoring".format(stripdir, fullname))
+        else:
+            dfile = os.path.join(*fullname_parts[len(stripdir_parts):])
 
     if prependdir is not None:
         if dfile is None:

Lib/test/support/__init__.py

@@ -2601,6 +2601,30 @@ def adjust_int_max_str_digits(max_digits):
                                 'skipped on s390x')
 HAVE_ASAN_FORK_BUG = check_sanitizer(address=True)
 
+# From Cpython 3.13.5
+@contextlib.contextmanager
+def no_color():
+    import _colorize
+    from .os_helper import EnvironmentVarGuard
+
+    with (
+        swap_attr(_colorize, "can_colorize", lambda file=None: False),
+        EnvironmentVarGuard() as env,
+    ):
+        env.unset("FORCE_COLOR", "NO_COLOR", "PYTHON_COLORS")
+        env.set("NO_COLOR", "1")
+        yield
+
+# From Cpython 3.13.5
+def force_not_colorized(func):
+    """Force the terminal not to be colorized."""
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        with no_color():
+            return func(*args, **kwargs)
+    return wrapper
+
+
 # From python 3.12.8
 class BrokenIter:
     def __init__(self, init_raises=False, next_raises=False, iter_raises=False):

Lib/test/support/os_helper.py

@@ -10,6 +10,9 @@
 import unittest
 import warnings
 
+# From CPython 3.13.5
+from test import support
+
 
 # Filename used for testing
 TESTFN_ASCII = '@test'
@@ -196,6 +199,26 @@ def skip_unless_symlink(test):
     return test if ok else unittest.skip(msg)(test)
 
 
+# From CPython 3.13.5
+_can_hardlink = None
+
+# From CPython 3.13.5
+def can_hardlink():
+    global _can_hardlink
+    if _can_hardlink is None:
+        # Android blocks hard links using SELinux
+        # (https://stackoverflow.com/q/32365690).
+        _can_hardlink = hasattr(os, "link") and not support.is_android
+    return _can_hardlink
+
+
+# From CPython 3.13.5
+def skip_unless_hardlink(test):
+    ok = can_hardlink()
+    msg = "requires hardlink support"
+    return test if ok else unittest.skip(msg)(test)
+
+
 _can_xattr = None
 
 
@@ -699,8 +722,11 @@ def __len__(self):
     def set(self, envvar, value):
         self[envvar] = value
 
-    def unset(self, envvar):
-        del self[envvar]
+    # From CPython 3.13.5
+    def unset(self, envvar, /, *envvars):
+        """Unset one or more environment variables."""
+        for ev in (envvar, *envvars):
+            del self[ev]
 
     def copy(self):
         # We do what os.environ.copy() does.