Here's a couple I made as well for upload/download to S3 before Travis CI had Docker containers with support for caching in OSS projects: https://github.com/tabolario/ci-scripts
These use the V4 signature, which I grabbed from an article somewhere on the subject that I can't seem to find anymore :( The cached-bundle script is inspired and based off the one from devise: https://github.com/plataformatec/devise/blob/master/script/c...