BUGFIX: S3 backups failed when using a region

TRIVIAL: updated fog gem to latest version (1.22.1)
BUGFIX: fixed algorithm used to remove old backups

Gemfile

@@ -102,7 +102,7 @@ gem 'fast_xs'
 
 gem 'fast_xor'
 gem 'fastimage'
-gem 'fog', '1.18.0', require: false
+gem 'fog', '1.22.1', require: false
 gem 'unf', require: false
 
 # see: https://twitter.com/samsaffron/status/412360162297393152

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       handlebars-source (~> 1.0)
     erubis (2.7.0)
     eventmachine (1.0.3)
-    excon (0.28.0)
+    excon (0.37.0)
     execjs (2.1.0)
     exifr (1.1.3)
     fabrication (2.9.8)
@@ -105,20 +105,29 @@ GEM
     ffi (1.9.3)
     flamegraph (0.0.5)
       fast_stack
-    fog (1.18.0)
+    fog (1.22.1)
+      fog-brightbox
+      fog-core (~> 1.22)
+      fog-json
+      ipaddress (~> 0.5)
+      nokogiri (~> 1.5, >= 1.5.11)
+    fog-brightbox (0.1.1)
+      fog-core (~> 1.22)
+      fog-json
+      inflecto
+    fog-core (1.22.0)
       builder
-      excon (~> 0.28.0)
+      excon (~> 0.33)
-      formatador (~> 0.2.0)
+      formatador (~> 0.2)
       mime-types
-      multi_json (~> 1.0)
       net-scp (~> 1.1)
       net-ssh (>= 2.1.3)
-      nokogiri (~> 1.5)
+    fog-json (1.0.0)
-      ruby-hmac
+      multi_json (~> 1.0)
     foreman (0.63.0)
       dotenv (>= 0.7)
       thor (>= 0.13.6)
-    formatador (0.2.4)
+    formatador (0.2.5)
     fspath (2.0.6)
     gctools (0.2.3)
     given_core (3.5.4)
@@ -139,6 +148,8 @@ GEM
       progress (~> 3.0.0)
     image_size (1.1.5)
     in_threads (1.2.0)
+    inflecto (0.0.2)
+    ipaddress (0.8.0)
     jquery-rails (3.1.0)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
@@ -175,9 +186,9 @@ GEM
     multi_xml (0.5.5)
     multipart-post (2.0.0)
     mustache (0.99.5)
-    net-scp (1.1.2)
+    net-scp (1.2.1)
       net-ssh (>= 2.6.5)
-    net-ssh (2.8.0)
+    net-ssh (2.9.1)
     nokogiri (1.6.2.1)
       mini_portile (= 0.6.0)
     oauth (0.4.7)
@@ -303,7 +314,6 @@ GEM
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)
       rspec-mocks (~> 2.14.0)
-    ruby-hmac (0.4.0)
     ruby-openid (2.5.0)
     ruby-readability (0.6.1)
       guess_html_encoding (>= 0.0.4)
@@ -410,7 +420,7 @@ DEPENDENCIES
   fast_xs
   fastimage
   flamegraph
-  fog (= 1.18.0)
+  fog (= 1.22.1)
   foreman
   gctools
   handlebars-source (= 1.3.0)

app/models/backup.rb

@@ -10,8 +10,10 @@ class Backup
   end
 
   def self.all
-    backups = Dir.glob(File.join(Backup.base_directory, "*.tar.gz"))
+    Dir.glob(File.join(Backup.base_directory, "*.tar.gz"))
-    backups.sort.reverse.map { |backup| Backup.create_from_filename(File.basename(backup)) }
+       .sort_by { |file| File.mtime(file) }
+       .reverse
+       .map { |backup| Backup.create_from_filename(File.basename(backup)) }
   end
 
   def self.[](filename)
@@ -65,20 +67,27 @@ class Backup
   def self.remove_old
     all_backups = Backup.all
     return unless all_backups.size > SiteSetting.maximum_backups
-    all_backups[SiteSetting.maximum_backups..-1].each {|b| b.remove}
+    all_backups[SiteSetting.maximum_backups..-1].each(&:remove)
   end
 
   private
 
+    def s3_options
+      {
+        provider: 'AWS',
+        aws_access_key_id: SiteSetting.s3_access_key_id,
+        aws_secret_access_key: SiteSetting.s3_secret_access_key,
+        region: SiteSetting.s3_region.blank? ? "us-east-1" : SiteSetting.s3_region,
+      }
+    end
+
     def fog
       return @fog if @fog
       return unless SiteSetting.s3_access_key_id.present? &&
                     SiteSetting.s3_secret_access_key.present? &&
                     SiteSetting.s3_backup_bucket.present?
       require 'fog'
-      @fog = Fog::Storage.new(provider: 'AWS',
+      @fog = Fog::Storage.new(s3_options)
-                              aws_access_key_id: SiteSetting.s3_access_key_id,
-                              aws_secret_access_key: SiteSetting.s3_secret_access_key)
     end
 
     def fog_directory