File cloud-init-purge-cache-py-ver-change.patch of Package cloud-init.20165

--- cloudinit/cmd/main.py.orig
+++ cloudinit/cmd/main.py
@@ -210,6 +210,24 @@ def attempt_cmdline_url(path, network=Tr
             "wrote cloud-config data from %s='%s' to %s" %
             (cmdline_name, url, path))
 
+def cache_pyver_maybe_purge_cache(init):
+    """Check if the Python version changed on us"""
+    pyver = '%d.%d' % (sys.version_info.major, sys.version_info.minor)
+    pyrefver = os.path.join(init.paths.get_cpath('data'), 'python-version')
+    if os.path.exists(pyrefver):
+        cached_pyver = open(pyrefver).read()
+        # The Python version has changed out from under us, anything that was
+        # pickled previously is likely useless due to API changes.
+        if cached_pyver != pyver:
+            LOG.debug('Python version change detected purging cache')
+            init.purge_cache(True)
+    else:
+        LOG.debug(
+            'Could not determine Python version used to write cache, purging'
+        )
+        init.purge_cache(True)
+    util.write_file(pyrefver, pyver)
+
 
 def main_init(name, args):
     deps = [sources.DEP_FILESYSTEM, sources.DEP_NETWORK]
@@ -277,6 +295,7 @@ def main_init(name, args):
         util.logexc(LOG, "Failed to initialize, likely bad things to come!")
     # Stage 4
     path_helper = init.paths
+    cache_pyver_maybe_purge_cache(init)
     mode = sources.DSMODE_LOCAL if args.local else sources.DSMODE_NETWORK
 
     if mode == sources.DSMODE_NETWORK: