Dan Watkins has proposed merging 
~daniel-thewatkins/cloud-init/+git/cloud-init:lp1843276 into cloud-init:master.

Commit message:
atomic_helper: add DEBUG logging to write_file

Fixes LP: #1843276

Requested reviews:
  Server Team CI bot (server-team-bot): continuous-integration
  cloud-init Commiters (cloud-init-dev)
Related bugs:
  Bug #1843276 in cloud-init: "cloudinit.atomic_helper.write_file should have 
the same logging as util.write_file"
  https://bugs.launchpad.net/cloud-init/+bug/1843276

For more details, see:
https://code.launchpad.net/~daniel-thewatkins/cloud-init/+git/cloud-init/+merge/372491
-- 
Your team cloud-init Commiters is requested to review the proposed merge of 
~daniel-thewatkins/cloud-init/+git/cloud-init:lp1843276 into cloud-init:master.
diff --git a/cloudinit/atomic_helper.py b/cloudinit/atomic_helper.py
index 587b994..077a780 100644
--- a/cloudinit/atomic_helper.py
+++ b/cloudinit/atomic_helper.py
@@ -1,11 +1,13 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 
 import json
+import logging
 import os
 import stat
 import tempfile
 
 _DEF_PERMS = 0o644
+LOG = logging.getLogger(__name__)
 
 
 def write_file(filename, content, mode=_DEF_PERMS,
@@ -23,9 +25,12 @@ def write_file(filename, content, mode=_DEF_PERMS,
     try:
         tf = tempfile.NamedTemporaryFile(dir=os.path.dirname(filename),
                                          delete=False, mode=omode)
+        LOG.debug("Writing to temporary file %s - %s: [%s] %s bytes/chars",
+                  tf.name, omode, mode, len(content))
         tf.write(content)
         tf.close()
         os.chmod(tf.name, mode)
+        LOG.debug("Renaming temporary file %s to %s", tf.name, filename)
         os.rename(tf.name, filename)
     except Exception as e:
         if tf is not None:
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