Retain executable mode

changelog.d/2041.bugfix.rst

@@ -0,0 +1 @@
+Preserve file modes during pkg files copying, but clear read only flag for target afterwards.

setuptools/command/build_py.py

@@ -7,6 +7,7 @@
 import io
 import distutils.errors
 import itertools
+import stat
 
 from setuptools.extern import six
 from setuptools.extern.six.moves import map, filter, filterfalse
@@ -20,6 +21,10 @@ def run_2to3(self, files, doctests=True):
             "do nothing"
 
 
+def make_writable(target):
+    os.chmod(target, os.stat(target).st_mode | stat.S_IWRITE)
+
+
 class build_py(orig.build_py, Mixin2to3):
     """Enhanced 'build_py' command that includes data files with packages
 
@@ -120,8 +125,8 @@ def build_package_data(self):
                 target = os.path.join(build_dir, filename)
                 self.mkpath(os.path.dirname(target))
                 srcfile = os.path.join(src_dir, filename)
-                outf, copied = self.copy_file(
-                    srcfile, target, preserve_mode=False)
+                outf, copied = self.copy_file(srcfile, target)
+                make_writable(target)
                 srcfile = os.path.abspath(srcfile)
                 if (copied and
                         srcfile in self.distribution.convert_2to3_doctests):

setuptools/tests/test_build_py.py

@@ -2,6 +2,8 @@
 import stat
 import shutil
 
+import pytest
+
 from setuptools.dist import Distribution
 
 
@@ -26,9 +28,10 @@ def test_directories_in_package_data_glob(tmpdir_cwd):
 
 def test_read_only(tmpdir_cwd):
     """
-    Ensure mode is not preserved in copy for package modules
-    and package data, as that causes problems
-    with deleting read-only files on Windows.
+    Ensure read-only flag is not preserved in copy
+    for package modules and package data, as that
+    causes problems with deleting read-only files on
+    Windows.
 
     #1451
     """
@@ -47,3 +50,35 @@ def test_read_only(tmpdir_cwd):
     dist.parse_command_line()
     dist.run_commands()
     shutil.rmtree('build')
+
+
+@pytest.mark.xfail(
+    'platform.system() == "Windows"',
+    reason="On Windows, files do not have executable bits",
+    raises=AssertionError,
+    strict=True,
+)
+def test_executable_data(tmpdir_cwd):
+    """
+    Ensure executable bit is preserved in copy for
+    package data, as users rely on it for scripts.
+
+    #2041
+    """
+    dist = Distribution(dict(
+        script_name='setup.py',
+        script_args=['build_py'],
+        packages=['pkg'],
+        package_data={'pkg': ['run-me']},
+        name='pkg',
+    ))
+    os.makedirs('pkg')
+    open('pkg/__init__.py', 'w').close()
+    open('pkg/run-me', 'w').close()
+    os.chmod('pkg/run-me', 0o700)
+
+    dist.parse_command_line()
+    dist.run_commands()
+
+    assert os.stat('build/lib/pkg/run-me').st_mode & stat.S_IEXEC, \
+        "Script is not executable"