Contributing

Thank you for considering making contributions to Ethermint! Start by taking a look at this coding repo for overall information on repository workflow and standards.

Please follow standard github best practices: fork the repo, branch from the tip of develop, make some commits, and submit a pull request to develop. See the open issues for things we need help with!

Please make sure to use gofmt before every commit - the easiest way to do this is have your editor run it for you upon saving a file. Additionally please ensure that your code is lint compliant by running make lint

Looking for a good place to start contributing? How about checking out some good first issues

Forking

Please note that Go requires code to live under absolute paths, which complicates forking. While your fork should live at https://github.com/<username>/ethermint, the code should not exist at $GOPATH/src/github.com/<username>/ethermint. Instead, you should use git remote to add the fork as a new remote for the original repo, $GOPATH/src/github.com/cosmos/ethermint , and do all the work there.

For instance, to create a fork and work on a branch of it, One would:

Create the fork on github, using the fork button.
Go to the original repo checked out locally (i.e. $GOPATH/src/github.com/cosmos/ethermint)
git remote rename origin upstream
git remote add origin git@github.com:<username>/ethermint.git

Now origin refers to my fork and upstream refers to the Ethermint version. So I can git push -u origin <branch> to update my fork, and make pull requests to Ethermint from there. Of course, replace <username> with your git handle.

To pull in updates from the origin repo, run

* `git fetch upstream`
* `git rebase upstream/develop` (or whatever branch you want)

Do not make Pull Requests to master, they will not be considered.

Dependencies

We use dep to manage dependencies.

That said, the master branch of every Cosmos repository should just build with go get, which means they should be kept up-to-date with their dependencies so we can get away with telling people they can just go get our software.

Since some dependencies are not under our control, a third party may break our build, in which case we can fall back on dep ensure (or make get-vendor-deps). Even for dependencies under our control, dep helps us to keep multiple repos in sync as they evolve. Anything with an executable, such as apps, tools, and the core, should use dep.

Run dep status to get a list of vendor dependencies that may not be up-to-date.

Testing

All repos should be hooked up to CircleCI.

If they have .go files in the root directory, they will be automatically tested by circle using go test -v -race ./.... If not, they will need a circle.yml. Ideally, every repo has a Makefile that defines make test and includes its continuous integration status using a badge in the README.md.

Branching Model and Release

User-facing repos should adhere to the branching model: http://nvie.com/posts/a-successful-git-branching-model/. That is, these repos should be well versioned, and any merge to master requires a version bump and tagged release.

Libraries need not follow the model strictly, but would be wise to.

Ethermint utilizes semantic versioning.

Development Procedure:

the latest state of development is on develop
develop must never fail make test
develop should not fail make test-lint
no --force onto develop (except when reverting a broken commit, which should seldom happen)
create a development branch either on github.com/cosmos/ethermint, or your fork (using git remote add origin)
squash your commits into an individual commit
before submitting a pull request, begin git rebase on top of develop

Pull Merge Procedure:

ensure pull branch is rebased on develop
squash your commits into an individual commit
run make test and make test-cli to ensure that all tests pass
merge pull request
push master may request that pull requests be rebased on top of unstable

Release Procedure:

start on develop
prepare changelog/release issue
bump versions
push to release-vX.X.X to run CI
merge to master
merge master back to develop

Hotfix Procedure:

start on master
checkout a new branch named hotfix-vX.X.X
make the required changes
- these changes should be small and an absolute necessity
- add a note to CHANGELOG.md
bump versions
push to hotfix-vX.X.X to run the extended integration tests on the CI
merge hotfix-vX.X.X to master
merge hotfix-vX.X.X to develop
delete the hotfix-vX.X.X branch

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