commit 013ca172c996bf90f42f54c1f7ae9c2e9639abbd
Author: Jeremy Stanley <fungi@yuggoth.org>
Date:   Sat Sep 19 13:33:52 2020 +0000

    More easy_install.ScriptWriter.get_header()
    
    Setuptools 12.0 deprecated easy_install.get_script_header() when it
    was released five years ago, and if called with PYTHONWARNINGS=error
    raises a deprecation exception. Switch to the preferred class
    method, but keep the original call as a fallback since it won't work
    on older Setuptools versions (such as the 3.3 shipped with Ubuntu
    Trusty). This continues 9a219f9a4f47243123d50d30938506bcc792e55d to
    remove a second call for the same deprecated function.
    
    Change-Id: I365075c2cff88283f92298ce2f5e53d263dc7f4b

diff --git a/pbr/packaging.py b/pbr/packaging.py
index 90b9933..ae07796 100644
--- a/pbr/packaging.py
+++ b/pbr/packaging.py
@@ -433,7 +433,11 @@ def generate_script(group, entry_point, header, template):
 def override_get_script_args(
         dist, executable=os.path.normpath(sys.executable)):
     """Override entrypoints console_script."""
-    header = easy_install.get_script_header("", executable)
+    # get_script_header() is deprecated since Setuptools 12.0
+    try:
+        header = easy_install.ScriptWriter.get_header("", executable)
+    except AttributeError:
+        header = easy_install.get_script_header("", executable)
     for group, template in ENTRY_POINTS_MAP.items():
         for name, ep in dist.get_entry_map(group).items():
             yield (name, generate_script(group, ep, header, template))