Aaron Whitehouse has proposed merging 
lp:~aaron-whitehouse/duplicity/07-fix_deja_dup_error_on_locked_files into 
lp:duplicity/0.7-series.

Commit message:
Revert log.Error to log.Warn, as it was prior to the merge in rev 1224, as this 
was affecting other applications (e.g. deja dup; Bug #1605939).

Requested reviews:
  duplicity-team (duplicity-team)
Related bugs:
  Bug #1605939 in Duplicity: "Error on locked files causing deja-dup "Backup 
Failed""
  https://bugs.launchpad.net/duplicity/+bug/1605939

For more details, see:
https://code.launchpad.net/~aaron-whitehouse/duplicity/07-fix_deja_dup_error_on_locked_files/+merge/300981

Revert log.Error to log.Warn, as it was prior to the merge in rev 1224, as this 
was affecting other applications (e.g. deja dup; Bug #1605939).

This means that if the user, for example, asks duplicity to back up /etc/ and 
some files are locked, it will give only "Warn" rather than "Error" log 
entries. 

This approach is not perfect, as from duplicity's perspective, it did really 
fail and the proper way to deal with the locked files at the command line is 
arguably to add an exception not to back up the files that you don't have 
access to read. That isn't easily done in deja dup, however, as that only 
allows directories to be excluded through the GUI.

Also, this was a change of behaviour from earlier versions (which "Warn"ed 
rather than "Error"ing), which counts for "Warn" unless there is a good reason 
to change it.
-- 
Your team duplicity-team is requested to review the proposed merge of 
lp:~aaron-whitehouse/duplicity/07-fix_deja_dup_error_on_locked_files into 
lp:duplicity/0.7-series.
=== modified file 'duplicity/selection.py'
--- duplicity/selection.py	2016-06-12 21:08:11 +0000
+++ duplicity/selection.py	2016-07-24 00:19:58 +0000
@@ -149,10 +149,10 @@
                             (s == 1 or s == 2):
                         # Path is a file or folder that cannot be read, but
                         # should be included or scanned.
-                        log.Error(_("Error accessing possibly locked file %s") %
-                                  util.ufn(new_path.name),
-                                  log.WarningCode.cannot_read,
-                                  util.escape(new_path.name))
+                        log.Warn(_("Error accessing possibly locked file %s") %
+                                 util.ufn(new_path.name),
+                                 log.WarningCode.cannot_read,
+                                 util.escape(new_path.name))
                         if diffdir.stats:
                             diffdir.stats.Errors += 1
                     elif s == 1:

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