This script updates the git submodule repositories and attempts to checkout the latest tag (release).

The goal of the script is to help people keep their git submodules as recent as possible.

Just copy the script to your repository and all should work.

The script goes through all git repositories in the /external directory in your project.

If it find a newer tag for one of the repositories (defaults to the newest one), it asks the user if they want to checkout this version:

Looking for tags for <REPOSITORY_PATH> (HEAD at <COMMIT_NUMBER>)
  <TAG_NAME> (<N> commits behind of HEAD; <F> files changed, <I> insertions( ), <D> deletions(-))
  switch to <TAG_NAME>? [y/N]

The user can then either type y to confirm or N (or just press enter) to skip this tag.

The script will then do the same for each tag going back in history.

The script looks at the HEAD (the current state) and if it corresponds to a tag, it moves on to the next external repository.

If the HEAD is not at a tag, the script attempts to downgrade the repository to the nearest tag (otherwise, same as in the previous section).

If you set PREEFER_TAGS=0 (or you hard-code it in the script this way), the script always asks whether the user whether they want to checkout the current state of the origin of the repository.

Then, the script acts as if the user specified PREFER_TAGS=0 and attempts to checkout the newest commit in the origin.

Write a github issue or make a pull request.