* s3thorp

Synchronisation of files with S3 using the hash of the file contents.

Based on Alex Kudlick's JavaScript implementation [[https://github.com/akud/aws-s3-sync-by-hash][aws-s3-sync-by-hash]].

The normal ~aws s3 sync ...~ command only uses the time stamp of files
to decide what files need to be copied. This utility looks at the md5
hash of the file contents.

* Usage

#+begin_example
s3thorp
Usage: S3Thorp [options]

  -s, --source <value>  Source directory to sync to S3
  -b, --bucket <value>  S3 bucket name
  -p, --prefix <value>  Prefix within the S3 Bucket
#+end_example

* Creating Native Images

  - Download and install GraalVM
    - https://github.com/oracle/graal/releases
  - Install ~native-image~ using the graal updater
    #+begin_example bash
      gu install native-image
    #+end_example
  - Create native image
    #+begin_example bash
      native-image -cp `sbt 'export runtime:fullClasspath'|tail -n 1` \
                   -H:Name=s3thorp \
                   -H:Class=net.kemitix.s3thorp.Main \
                   --allow-incomplete-classpath \
                   --force-fallback
    #+end_example
  - Resulting file requires a JDK for execution

* TO DO

- [X] Improve test coverage
- [X] Create os-native binaries
- [X] Replace println with real logging
- [ ] Add support for logging options
- [ ] Add support for exclusion filters
- [ ] Bulk fetching of Hash values from S3
- [ ] ? When lastModified matches local file, skip calculating local MD5 ?
- [ ] Add support for multi-part uploads for large files
- [ ] Add support for upload progress - may only be available with
  multi-part uploads