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# Contributing to Cockroach
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### Assumed
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* A working GCC (on mac os x something like `xcode-select --install` will get you started)
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* [Go environment](http://golang.org/doc/code.html)
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* [prerequisites for building
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RocksDB](https://github.com/cockroachdb/rocksdb/blob/master/INSTALL.md)
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* [protoc](https://github.com/google/protobuf/releases)
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* pkgconfig
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* curl
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If you're on Mac OS X, [homebrew](http://brew.sh/) can be very helpful to fulfill these dependencies.
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mkdir -p $GOPATH/src/github.com/cockroachdb/
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cd $GOPATH/src/github.com/cockroachdb/
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git clone git@github.com:cockroachdb/cockroach.git
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cd cockroach
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### Style guide
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We're following the [Google Go Code Review](https://code.google.com/p/go-wiki/wiki/CodeReviewComments) fairly closely. In particular, you want to watch out for proper punctuation and capitalization and make sure that your lines stay well below 80 characters.
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If you are working on your own fork, see
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[this tip](http://blog.campoy.cat/2014/03/github-and-go-forking-pull-requests-and.html)
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on forking in Go, which ensures that Go import paths will be correct.
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+ When you’re ready for review, create a remote branch from your local branch. You may want to `git fetch origin` and run `git rebase origin/master` on your local feature branch before.
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+ Then [create a pull request using GitHub’s UI](https://help.github.com/articles/creating-a-pull-request).
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+ Address feedback in new commits. Wait (or ask) for new feedback on those commits if they are not straightforward.
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+ Once ready to land your change, squash your commits. Where n is the number of commits in your branch, run
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`git rebase -i HEAD~n`
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and subsequently update your remote (you will have to force the push, `git push -f andybons mybranch`). The pull request will update.
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+ If you do not have write access to the repository and your pull request requires a manual merge, you may be asked to rebase again,
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`git fetch origin; git rebase -i origin/master` and update the PR again. Otherwise, you are free to merge your branch into origin/master directly or rebase first as you deem appropriate.
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