Bummr

Updating Gems one by one is a bumm(e)r: especially when one gem causes your build to fail.

Gems should be updated in separate commits.

The bummr gem allows you to automatically update all gems which pass your build in separate commits, and logs the name and sha of each gem that fails.

Bummr assumes you have good test coverage and follow a pull-request workflow.

By default, bummr will assume your base branch is named main. If you would like to designate a different base branch, you can set the BASE_BRANCH environment variable: export BASE_BRANCH='main'

Compatibility

Bundler Version	Bummr Version
<= 2.1	<= 0.6.0
>= 2.2	>= 1.0.0

Setup

$ gem install bummr

To run headless (skip interactive rebasing/confirmation), use BUMMR_HEADLESS=true bundle exec bummr update.

By default, bummr will use bundle exec rake to run your build.

To customize your build command, export BUMMR_TEST="./bummr-build.sh"

If you prefer, you can run the build more than once, to protect against brittle tests and false positives.

Usage

Using bummr can take anywhere from a few minutes to several hours, depending on the number of outdated gems you have and the number of tests in your test suite.

For the purpose of these instructions, we are assuming that your base branch is main. If you would like to specify a different base branch, see the instructions in the Installation section of this README.

• After installing, create a new, clean branch off of your main branch.
• Run bummr update. This may take some time.
• Bummr will give you the opportunity to interactively rebase your branch before running the tests. Careful.
• At this point, you can leave bummr to work for some time.
• If your build fails, bummr will notify you of failures, logging the failures to log/bummr.log. At this point it is recommended that you lock that gem version in your Gemfile and start the process over from the top. Alternatively, you may wish to implement code changes which fix the problem.
• Once your build passes, open a pull-request and merge it to your main branch.

bummr update

• Options:

  • --all to include indirect dependencies (bummr defaults to direct dependencies only)
  • --group to update only gems from a specific group (i.e. test, development)
  • --gem to update only a specific gem (i.e. tzinfo)

• Finds all your outdated gems

• Updates them each individually, using bundle update --source #{gemname}. To use a less conservative update strategy, start bummr update with the --all option.

• Commits each gem update separately, with a commit message like:

Update gemname from 0.0.1 to 0.0.2

• Runs git rebase -i main to allow you the chance to review and make changes.
• Runs bummr test

bummr test

• Runs your build script (.bummr-build.sh).
• If there is a failure, runs bummr bisect.

bummr bisect

• git bisects against main.
• Upon finding the bad commit, runs git bisect reset and notifies the developer on how best to proceed.
• Logs the bad commit in log/bummr.log.

Notes

• Bummr assumes you have good test coverage and follow a pull-request workflow with main as your default branch.
• Once the build passes, you can push your branch and create a pull-request!
• You may wish to tail -f log/bummr.log in a separate terminal window so you can see which commits are being removed.

License

See LICENSE

Developing

Set version in lib/bummr/version.rb

rake build to build locally

gem install --local ./pkg/bummr-X.X.X.gem with the ruby version of the app you'd like to use it with.

rake will run the suite of unit tests.

gem push ./pkg/bummr-x.x.x.gem to publish new versions.

The suite relies on Oliver Peate's jet black testing library for command line feature tests.

Thank you!

Thanks to Ryan Sonnek for the Bundler Updater gem.