S3 Bucket Versioning

gistfile1.rb

1.8.7 :018 > bucket = s3.buckets['oliver-test-versioning']
 => #<AWS::S3::Bucket:oliver-test-versioning> 
1.8.7 :026 > bucket.enable_versioning
 => nil 
1.8.7 :027 > bucket.versioned?
 => true 
1.8.7 :029 > bucket.versions.each { |v| puts v.class }
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
 => nil 
1.8.7 :030 > bucket.objects.each { |o| o.delete }
 => nil
1.8.7 :031 > bucket.versions.each { |v| puts v.class }
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
AWS::S3::ObjectVersion
 => nil 
1.8.7 :033 > bucket.versions.each { |v| puts "#{v.object.key} => #{v.version_id} (#{v.delete_marker?})" }
24_StdNetz_0107_2012.pdf => WZ5sC9WmMWciIDk928diy_XwJGLMbeH5 (true)
24_StdNetz_0107_2012.pdf => null (false)
S%2BU-Bahn_0107_2012.pdf => Hkkn52r0VOD7kv2ahDukT.pREcmMxQUA (true)
S%2BU-Bahn_0107_2012.pdf => null (false)
TramMetro_0608_2012.pdf => bgQaftdD_d8AdUbxxf8ylzT1EURwItRQ (true)
TramMetro_0608_2012.pdf => null (false)
 => nil 
1.8.7 :034 > bucket.versions.each { |v| v.delete }
 => nil 
1.8.7 :035 > bucket.versions.each { |v| puts "#{v.object.key} => #{v.version_id} (#{v.delete_marker?})" }
 => nil 

Note that MFA Delete is not enabled, hence it is possible to just delete all versions.