At this point in time, Zircon is under heavy, active development, and we're not seeking major changes or new features from new contributors, however, if you desire to contribute, small bugfixes are welcome.
Here are some general guidelines for patches to Zircon. This list is incomplete and will be expanded over time:
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GitHub pull requests are not accepted. Patches are handled via Gerrit Code Review at: https://fuchsia-review.googlesource.com/#/q/project:zircon
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Indentation is with spaces, four spaces per indent. Never tabs. Do not leave trailing whitespace on lines. Gerrit will flag bad whitespace usage with a red background in diffs.
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Match the style of surrounding code.
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Avoid whitespace or style changes. Especially do not mix style changes with patches that do other things as the style changes are a distraction.
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Avoid changes that touch multiple modules at once if possible. Most changes should be to a single library, driver, app, etc.
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Include [tags] in the commit subject flagging which module, library, app, etc, is affected by the change. The style here is somewhat informal. Look at past changes to get a feel for how these are used.
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Zircon should be buildable for all major targets (x86-64, arm64) at every change. ./scripts/build-all-zircon can help with this.
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Avoid breaking the unit tests. Boot Zircon and run "runtests" to verify that they're all passing.
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The #fuchsia channel on the freenode irc network is a good place to ask questions.
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[Googlers only] Commit messages may reference issue IDs, which will be turned into links in the Gerrit UI. Issues may also be automatically closed using the syntax
BUG-123 #done. Note: Zircon's issue tracker is not open to external contributors at this time.