commit bf870157e0a9c3d19e968afb276b4e7d96b4df30
Author: Doron Behar <doron.behar@gmail.com>
Date:   Thu Oct 21 13:10:42 2021 +0300

    gr-modtool: Don't copy source permissions
    
    This is needed for systems such as NixOS, where the build tree isn't
    writable and the files copied should be.
    
    Signed-off-by: Doron Behar <doron.behar@gmail.com>

diff --git a/gr-utils/python/modtool/core/newmod.py b/gr-utils/python/modtool/core/newmod.py
index 123059907..0c734e7ae 100644
--- a/gr-utils/python/modtool/core/newmod.py
+++ b/gr-utils/python/modtool/core/newmod.py
@@ -78,7 +78,9 @@ class ModToolNewModule(ModTool):
         self._setup_scm(mode='new')
         logger.info("Creating out-of-tree module in {}...".format(self.dir))
         try:
-            shutil.copytree(self.srcdir, self.dir)
+            # https://stackoverflow.com/a/17022146/4935114
+            shutil.copystat = lambda x, y: x
+            shutil.copytree(self.srcdir, self.dir, copy_function=shutil.copyfile)
             os.chdir(self.dir)
         except OSError:
             raise ModToolException('Could not create directory {}.'.format(self.dir))