Merge lp:~daniel-muller/deja-dup/deja-dup into lp:deja-dup/32

[Daniel Muller]

Added S3 Reduced Redundancy Storage (RRS), allowing to close wishlist 811954.
Passing --s3-use-rrs to duplicity.
No GUI. The boolean option is read from dconf setting (defaulting to false).

First time I do this. So not sure I did everything right.

[Michael Terry (mterry)]

From http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingRRS.html:

"Reduced redundancy storage is designed to provide 99.99% durability of objects over a given year. This durability level corresponds to an average annual expected loss of 0.01% of objects. For example, if you store 10,000 objects using the RRS option, you can, on average, expect to incur an annual loss of a single object per year (0.01% of 10,000 objects)."

Doesn't that seem bad? Losing even a single file in duplicity's incremental chain is not great.

[Daniel Muller (daniel-muller)]

Effectively, RRS is less reliable. I believe this is a risk some peoples are willing to take. Specially if S3 is a secondary backup location, or if S3 is itself backed-up to Glacier.

Unmerged revisions

1539. By Daniel Muller on 2014-05-10

Add S3 RRS support (LP #811954)

=== modified file 'libdeja/BackendS3.vala'
--- libdeja/BackendS3.vala	2012-10-25 16:00:23 +0000
+++ libdeja/BackendS3.vala	2014-05-10 10:34:21 +0000
@@ -25,6 +25,7 @@
 public const string S3_ID_KEY = "id";
 public const string S3_BUCKET_KEY = "bucket";
 public const string S3_FOLDER_KEY = "folder";
+public const string S3_RRS_KEY = "rrs";
 
 const string S3_SERVER = "s3.amazonaws.com";
 
@@ -38,9 +39,15 @@
     return new BackendS3();
   }
   
+  bool settings_rrs;
   public override void add_argv(ToolJob.Mode mode, ref List<string> argv) {
     if (mode == ToolJob.Mode.INVALID)
       argv.append("--s3-use-new-style");
+
+    var settings = get_settings(S3_ROOT);
+    settings_rrs = settings.get_boolean(S3_RRS_KEY);
+    if (settings_rrs) 
+      argv.append("--s3-use-rrs");
   }
   
   string get_default_bucket() {