fix amazonbackup script, trap on epipe exception for db backup

app/models/amazon_backup.rb

@@ -24,7 +24,7 @@ class AmazonBackup < ActiveRecord::Base
         AWS::S3::S3Object.store(File.basename(post.file_path), open(post.file_path, "rb"), Danbooru.config.amazon_s3_bucket_name, "Content-MD5" => base64_md5)
       end
 
-      if post.image? && File.exists?(post.preview_file_path)
+      if post.is_image? && File.exists?(post.preview_file_path)
         AWS::S3::S3Object.store("preview/#{post.md5}.jpg", open(post.preview_file_path, "rb"), Danbooru.config.amazon_s3_bucket_name)
       end
 
@@ -32,7 +32,7 @@ class AmazonBackup < ActiveRecord::Base
         AWS::S3::S3Object.store("large/#{post.md5}.jpg", open(post.large_file_path, "rb"), Danbooru.config.amazon_s3_bucket_name)
       end
 
-      AmazonBackup.update_id(last_id)
+      AmazonBackup.update_id(post.id)
     end
   rescue Exception => x
     # probably some network error, retry next time

config/danbooru_default_config.rb

@@ -298,6 +298,10 @@ module Danbooru
       nil
     end
 
+    def amazon_s3_bucket_name
+      "danbooru"
+    end
+
     def enable_dimension_autotagging
       true
     end

script/donmai/backup_db_to_s3

@@ -20,7 +20,7 @@ end
 access_key = open("#{home}/.s3/access_key").read.strip
 secret_access_key = open("#{home}/.s3/secret_access_key").read.strip
 
-AWS::S3::Base.establish_connection!(:access_key_id => access_key, :secret_access_key => secret_access_key)
+AWS::S3::Base.establish_connection!(:access_key_id => access_key, :secret_access_key => secret_access_key, :server => "s3.amazonaws.com")
 
 current_backups = AWS::S3::Bucket.find("danbooru-backup").objects.map {|x| x.key}.select {|x| x =~ /^db-/}.sort.reverse
 
@@ -34,5 +34,17 @@ end
 backup = Dir["/var/www/danbooru2/shared/backup/db-*.dump"].sort.last
 data = File.open(backup, "rb")
 filename = data.mtime.strftime("db-%Y-%m-%d-%H-%M")
-AWS::S3::S3Object.store(filename, data, "danbooru-backup", :access => :private)
+tries = 0
+
+begin
+  AWS::S3::S3Object.store(filename, data, "danbooru-backup", :access => :private)
+rescue Errno::EPIPE
+  tries += 1
+  if tries > 3
+    raise
+  else
+    retry
+  end
+end
+
 puts "Uploaded #{backup} as #{filename}"