File: CONTRIBUTING.md

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# Contributing to bnd

Want to hack on bnd? Here are instructions to get you
started. They are probably not perfect, please let us know if anything
feels wrong or incomplete.

## Reporting Issues

When reporting [issues](https://github.com/bndtools/bnd/issues) 
on GitHub please include the version of bnd you are using, `bnd version`,
as well as the version of Java, `java -version`, and your OS. Also, please
provide the `Git-SHA` and `Git-Descriptor` headers from the bnd jar file.
Please include the steps required to reproduce the problem if possible and applicable.
This information will help us review and fix your issue faster.

## Build Environment

The only thing you need to build bnd is Java. We use Java 7 but most
projects only require Java 6. We use Gradle to build and The repo 
includes `gradlew` but you can use your system `gradle` but we require 
at least version 2.0.

`gradle`              - Assembles, tests and releases the projects into dist/bundles  
`gradle :dist:build`  - Assembles and tests the projects  
`gradle :dist:index`  - Assembles and releases the projects into dist/bundles..

We use [Travis CI](https://travis-ci.org/bndtools/bnd) and the repo includes a
`.travis.yml` file to build on Travis CI.

## Workflow

We use [git triangular workflow](https://www.sociomantic.com/blog/2014/05/git-triangular-workflow/).
This means that no one, not even the bnd maintainers, push contributions directly into the [main bnd
repo](https://github.com/bndtools/bnd). All contribution come in through pull requests.
So each contribtor will need to [fork the main bnd repo](https://github.com/bndtools/bnd/fork)
on GitHub. All contributions are made as commits to your fork. Then you submit a
pull request to have them considered for merging into the main bnd repo.

### Setting up the triangular workflow

After forking the main bnd repo on GitHub, you can clone the main repo to your system:

    git clone https://github.com/bndtools/bnd.git

This will clone the main repo to a local repo on your disk and set up the `origin` remote in Git.
Next you will set up the the second side of the triangle to your fork repo.

    cd bnd
    git remote add fork git@github.com:github-user/bnd.git

Make sure to replace the URL with the SSH URL to your fork repo on GitHub. Then we configure
the local repo to push your commits to the fork repo.

    git config remote.pushdefault fork

So now you will pull from `origin`, the main repo, and push to `fork`, your fork repo.
This option requires at least Git 1.8.4. It is also recommended that you configure

    git config push.default simple

unless you are already using Git 2.0 where it is the default.

Finally, the third side of the triangle is pull requests from your fork repo to the
main repo.

Make sure to set up [Travis CI](https://travis-ci.org) for your fork repo to test your commits
when they are pushed to your fork repo. Travis CI will also build any [pull requests you 
submit](https://travis-ci.org/bndtools/bnd/pull_requests).

## Contribution guidelines

### Pull requests are always welcome

We are always thrilled to receive pull requests, and do our best to
process them as fast as possible. Not sure if that typo is worth a pull
request? Do it! We will appreciate it.

If your pull request is not accepted on the first try, don't be
discouraged! If there's a problem with the implementation, hopefully you
received feedback on what to improve.

We're trying very hard to keep bnd lean and focused. We don't want it
to do everything for everybody. This means that we might decide against
incorporating a new feature. However, there might be a way to implement
that feature *on top of* bnd.

### Create issues...

Any significant improvement should be documented as [a GitHub
issue](https://github.com/bndtools/bnd/issues) before anybody
starts working on it.

### ...but check for existing issues first!

Please take a moment to check that an issue doesn't already exist
documenting your bug report or improvement proposal. If it does, it
never hurts to add a quick "+1" or "I have this problem too". This will
help prioritize the most common problems and requests.

### Conventions

Fork the repo and make changes on your fork in a feature branch:

- If it's a bugfix branch, name it XXX-something where XXX is the number of the
  issue
- If it's a feature branch, create an enhancement issue to announce your
  intentions, and name it XXX-something where XXX is the number of the issue.

Submit unit tests for your changes. We use `junit` and most projects already 
have a number of test cases. The test cases for `biz.aQute.bndlib` are however
in the `biz.aQute.bndlib.tests` project for historical reasons.
Take a look at existing tests for inspiration. Run the full build including all
the tests in your branch before submitting a pull request. Having Travis CI set up
for your fork repo is quite a help here.

Write clean code. Universally formatted code promotes ease of writing, reading,
and maintenance. We use Eclipse and all the projects have Eclipse `.settings` which
will properly format the code. Make sure to avoid unnecessary white space changes
which complicate diffs and make reviewing pull requests much more time consuming.

Pull requests descriptions should be as clear as possible and include a
reference to all the issues that they address.

Pull requests must not contain commits from other users or branches.

Commit messages must start with a short summary (max. 50
chars) written in the imperative, followed by an optional, more detailed
explanatory text which is separated from the summary by an empty line.

    index: Remove absolute URLs from the OBR index

    The url for the root was missing a trailing slash. Using File.toURI to
    create an acceptable url.

Code review comments may be added to your pull request. Discuss, then make the
suggested modifications and push additional commits to your feature branch. Be
sure to post a comment after pushing. The new commits will show up in the pull
request automatically, but the reviewers will not be notified unless you
comment.

Before the pull request is merged, make sure that you squash your commits into
logical units of work using `git rebase -i` and `git push -f`. After every
commit, the test suite should be passing. Include documentation changes in the
same commit so that a revert would remove all traces of the feature or fix.

Commits that fix or close an issue should include a reference like `Closes #XXX`
or `Fixes #XXX`, which will automatically close the issue when merged.

### Sign your work

The sign-off is a simple line at the end of the commit message
which certifies that you wrote it or otherwise have the right to
pass it on as an open-source patch.  The rules are pretty simple: if you
can certify the below (from
[developercertificate.org](http://developercertificate.org/)):

```
Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.
```

then you just add a line to end of the git commit message:

    Signed-off-by: Joe Smith <joe.smith@email.com>

using your real name. Sorry, no pseudonyms or anonymous contributions.

Many Git UI tools have support for adding the `Signed-off-by` line to the end of your commit
message. This line can be automatically added by the `git commit` command by using the `-s` option.

#### Small patch exception

There are some exceptions to the signing requirement. Currently these are:

* Your patch fixes spelling or grammar errors.

### Merge approval

The bnd maintainers will review your pull request and, if approved, will merge into
the main repo.

### How can I become a maintainer?

* Step 1: learn the code inside out
* Step 2: make yourself useful by contributing code, bugfixes, support etc.
* Step 3: introduce your self to the other maintainers

Don't forget: being a maintainer is a time investment. Make sure you will have time
to make yourself available. You don't have to be a maintainer to make a difference
on the project!