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-rw-r--r--changelog.d/1424.change.rst1
-rw-r--r--setuptools/command/build_py.py2
2 files changed, 2 insertions, 1 deletions
diff --git a/changelog.d/1424.change.rst b/changelog.d/1424.change.rst
new file mode 100644
index 00000000..361997dd
--- /dev/null
+++ b/changelog.d/1424.change.rst
@@ -0,0 +1 @@
+Prevent keeping files mode for package_data build. It may break a build if user's package data has read only flag. \ No newline at end of file
diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index b0314fd4..6fc0a4e4 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -120,7 +120,7 @@ class build_py(orig.build_py, Mixin2to3):
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)
+ outf, copied = self.copy_file(srcfile, target, preserve_mode=False)
srcfile = os.path.abspath(srcfile)
if (copied and
srcfile in self.distribution.convert_2to3_doctests):