2015-10-29 19:43:10 +01:00
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coreboot Gerrit Etiquette and Guidelines
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========================================
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The following rules are the requirements for behavior in the coreboot
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codebase in gerrit. These have mainly been unwritten rules up to this
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point, and should be familiar to most users who have been active in
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coreboot for a period of time. Following these rules will help reduce
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friction in the community.
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Note that as with many rules, there are exceptions. Some have been noted
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in the 'More Detail' section. If you feel there is an exception not listed
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here, please discuss it in the mailing list to get this document updated.
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Don't just assume that it's okay, even if someone on IRC says it is.
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2018-09-30 20:10:04 +02:00
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Summary
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-------
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2015-10-29 19:43:10 +01:00
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These are the expectations for committing, reviewing, and submitting code
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into coreboot git and gerrit. While breaking individual rules may not have
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immediate consequences, the coreboot leadership may act on repeated or
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flagrant violations with or without notice.
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* Don't violate the licenses.
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* Let non-trivial patches sit in a review state for at least 24 hours
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before submission.
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* Try to coordinate with platform maintainers when making changes to
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platforms.
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* If you give a patch a -2, you are responsible for giving concrete
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recommendations for what could be changed to resolve the issue the patch
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addresses.
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* Don't modify other people's patches without their consent.
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* Be respectful to others when commenting.
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* Don’t submit patches that you know will break other platforms.
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2018-09-30 20:10:04 +02:00
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More detail
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-----------
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2015-10-29 19:43:10 +01:00
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* Don't violate the licenses. If you're submitting code that you didn't
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write yourself, make sure the license is compatible with the license of the
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project you're submitting the changes to. If you’re submitting code that
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you wrote that might be owned by your employer, make sure that your
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employer is aware and you are authorized to submit the code. For
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clarification, see the Developer's Certificate of Origin in the coreboot
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2017-06-05 12:33:23 +02:00
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[Signed-off-by policy](https://www.coreboot.org/Development_Guidelines#Sign-off_Procedure).
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2015-10-29 19:43:10 +01:00
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2020-07-15 19:50:40 +02:00
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* In general, patches should remain open for review for at least 24 hours
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since the last significant modification to the change. The purpose is to
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let coreboot developers around the world have a chance to review. Complex
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reworks, even if they don't change the purpose of the patch but the way
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it's implemented, should restart the wait period.
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* A change can go in without the wait period if its purpose is to fix
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a recently-introduced issue (build, boot or OS-level compatibility, not
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necessarily identified by coreboot.org facilities). Its commit message
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has to explain what change introduced the problem and the nature of
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the problem so that the emergency need becomes apparent. The change
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itself should be as limited in scope and impact as possible to make it
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simple to assess the impact. Such a change can be merged early with 3
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Code-Review+2. For emergency fixes that affect a single project (SoC,
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mainboard, ...) it's _strongly_ recommended to get a review by somebody
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not involved with that project to ensure that the documentation of the
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issue is clear enough.
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* Trivial changes that deal with minor issues like inconsistencies in
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whitespace or spelling fixes that don't impact the final binary output
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also don't need to wait. Such changes should point out in their commit
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messages how the the author verified that the binary output is identical
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(e.g. a TIMELESS build for a given configuration). When submitting
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such changes early, the submitter must be different from the author
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and must document the intent in the Gerrit discussion, e.g. "landed the
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change early because it's trivial". Note that trivial fixes shouldn't
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necessarily be expedited: Just like they're not critical enough for
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things to go wrong because of them, they're not critical enough to
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require quick handling. This exception merely serves to acknowledge that
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a round-the-world review just isn't necessary for some types of changes.
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* As explained in our Code of Conduct, we try to assume the best of each
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other in this community. It's okay to discuss mistakes (e.g. isolated
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instances of non-trivial and non-critical changes submitted early) but
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try to keep such inquiries blameless. If a change leads to problems with
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our code, the focus should be on fixing the issue, not on assigning blame.
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2015-10-29 19:43:10 +01:00
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* Do not +2 patches that you authored or own, even for something as trivial
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as whitespace fixes. When working on your own patches, it’s easy to
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overlook something like accidentally updating file permissions or git
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submodule commit IDs. Let someone else review the patch. An exception to
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this would be if two people worked in the patch together. If both +2 the
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patch, that is acceptable, as each is giving a +2 to the other's work.
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* Try to coordinate with platform maintainers and other significant
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contributors to the code when making changes to platforms. The platform
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maintainers are the users who initially pushed the code for that platform,
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as well as users who have made significant changes to a platform. To find
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out who maintains a piece of code, please use util/scripts/maintainers.go
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or refer to the original author of the code in git log.
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* If you give a patch a -2, you are responsible for giving concrete
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recommendations for what could be changed to resolve the issue the patch
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addresses. If you feel strongly that a patch should NEVER be merged, you
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are responsible for defending your position and listening to other points
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of view. Giving a -2 and walking away is not acceptable, and may cause your
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-2 to be removed by the coreboot leadership after no less than a week. A
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notification that the -2 will be removed unless there is a response will
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be sent out at least 2 days before it is removed.
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* Don't modify other people's patches unless you have coordinated this with
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the owner of that patch. Not only is this considered rude, but your changes
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could be unintentionally lost. An exception to this would be for patches
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that have not been updated for more than 90 days. In that case, the patch
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can be taken over if the original author does not respond to requests for
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updates. Alternatively, a new patch can be pushed with the original
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content, and both patches should be updated to reference the other.
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* Be respectful to others when commenting on patches. Comments should
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be kept to the code, and should be kept in a polite tone. We are a
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worldwide community and English is a difficult language. Assume your
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colleagues are intelligent and do not intend disrespect. Resist the urge to
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retaliate against perceived verbal misconduct, such behavior is not
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conducive to getting patches merged.
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* Don’t submit code that you know will break other platforms. If your patch
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affects code that is used by other platforms, it should be compatible with
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those platforms. While it would be nice to update any other platforms, you
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must at least provide a path that will allow other platforms to continue
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working.
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2018-09-30 20:10:04 +02:00
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Recommendations for gerrit activity
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-----------------------------------
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2015-10-29 19:43:10 +01:00
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These guidelines are less strict than the ones listed above. These are more
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of the “good idea” variety. You are requested to follow the below
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guidelines, but there will probably be no actual consequences if they’re
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not followed. That said, following the recommendations below will speed up
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review of your patches, and make the members of the community do less work.
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* Each patch should be kept to one logical change, which should be
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described in the title of the patch. Unrelated changes should be split out
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into separate patches. Fixing whitespace on a line you’re editing is
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reasonable. Fixing whitespace around the code you’re working on should be a
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separate ‘cleanup’ patch. Larger patches that touch several areas are fine,
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so long as they are one logical change. Adding new chips and doing code
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cleanup over wide areas are two examples of this.
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* Test your patches before submitting them to gerrit. It's also appreciated
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if you add a line to the commit message describing how the patch was
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tested. This prevents people from having to ask whether and how the patch
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was tested. Examples of this sort of comment would be ‘TEST=Built
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platform’ or ‘Tested by building and booting platform’. Stating that the
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patch was not tested is also fine, although you might be asked to do some
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testing in cases where that would be reasonable.
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* Take advantage of the lint tools to make sure your patches don’t contain
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trivial mistakes. By running ‘make gitconfig’, the lint-stable tools are
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automatically put in place and will test your patches before they are
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committed. As a violation of these tools will cause the jenkins build test
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to fail, it’s to your advantage to test this before pushing to gerrit.
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* Don't submit patch trains longer than around 20 patches unless you
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understand how to manage long patch trains. Long patch trains can become
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difficult to handle and tie up the build servers for long periods of time
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if not managed well. Rebasing a patch train over and over as you fix
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earlier patches in the train can hide comments, and make people review the
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code multiple times to see if anything has changed between revisions. When
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pushing long patch trains, it is recommended to only push the full patch
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train once - the initial time, and only to rebase three or four patches at
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a time.
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* Run 'make what-jenkins-does' locally on patch trains before submitting.
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This helps verify that the patch train won’t tie up the jenkins builders
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for no reason if there are failing patches in the train. For running
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parallel builds, you can specify the number of cores to use by setting the
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the CPUS environment variable. Example:
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make what-jenkins-does CPUS=8
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* Use a topic when pushing a train of patches. This groups the commits
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together so people can easily see the connection at the top level of
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gerrit. Topics can be set for individual patches in gerrit by going into
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the patch and clicking on the icon next to the topic line. Topics can also
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be set when you push the patches into gerrit. For example, to push a set of
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commits with the i915-kernel-x60 set, use the command:
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git push origin HEAD:refs/for/master%topic=i915-kernel-x60
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2015-10-29 19:43:10 +01:00
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* If one of your patches isn't ready to be merged, make sure it's obvious
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that you don't feel it's ready for merge yet. The preferred way to show
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this is by marking in the commit message that it’s not ready until X. The
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commit message can be updated easily when it’s ready to be pushed.
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Examples of this are "WIP: title" or "[NEEDS_TEST]: title". Another way to
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mark the patch as not ready would be to give it a -1 or -2 review, but
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2018-12-19 11:39:39 +01:00
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isn't as obvious as the commit message. These patches can also be pushed with
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the wip flag:
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git push origin HEAD:refs/for/master%wip
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* When pushing patches that are not for submission, these should be marked
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as such. This can be done in the title ‘[DONOTSUBMIT]’, or can be pushed as
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private changes, so that only explicitly added reviewers will see them. These
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sorts of patches are frequently posted as ideas or RFCs for the community
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to look at. To push a private change, use the command:
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git push origin HEAD:refs/for/master%private
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* Multiple push options can be combined:
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git push origin HEAD:refs/for/master%private,wip,topic=experiment
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* Respond to anyone who has taken the time to review your patches, even if
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it's just to say that you disagree. While it may seem annoying to address a
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request to fix spelling or 'trivial' issues, it’s generally easy to handle
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in gerrit’s built-in editor. If you do use the built-in editor, remember to
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get that change to your local copy before re-pushing. It's also acceptable
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to add fixes for these sorts of comments to another patch, but it's
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recommended that that patch be pushed to gerrit before the initial patch
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gets submitted.
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* Consider breaking up large individual patches into smaller patches
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grouped by areas. This makes the patches easier to review, but increases
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the number of patches. The way you want to handle this is a personal
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decision, as long as each patch is still one logical change.
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* If you have an interest in a particular area or mainboard, set yourself
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up as a ‘maintainer’ of that area by adding yourself to the MAINTAINERS
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file in the coreboot root directory. Eventually, this should automatically
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add you as a reviewer when an area that you’re listed as a maintainer is
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changed.
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* Submit mainboards that you’re working on to the board-status repo. This
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helps others and shows that these mainboards are currently being
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maintained. At some point, boards that are not up to date in the
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board-status repo will probably end up getting removed from the coreboot
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master branch.
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* Abandon patches that are no longer useful, or that you don’t intend to
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keep working on to get submitted.
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* Bring attention to patches that you would like reviewed. Add reviewers,
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ask for reviewers on IRC or even just rebase it against the current
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codebase to bring it to the top of the gerrit list. If you’re not sure who
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would be a good reviewer, look in the MAINTAINERS file or git history of
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the files that you’ve changed, and add those people.
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* Familiarize yourself with the coreboot [commit message
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guidelines](https://www.coreboot.org/Git#Commit_messages), before pushing
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patches. This will help to keep annoying requests to fix your commit
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message to a minimum.
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* If there have been comments or discussion on a patch, verify that the
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comments have been addressed before giving a +2. If you feel that a comment
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is invalid, please respond to that comment instead of just ignoring it.
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* Be conscientious when reviewing patches. As a reviewer who approves (+2)
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a patch, you are responsible for the patch and the effect it has on the
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codebase. In the event that the patch breaks things, you are expected to
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be actively involved in the cleanup effort. This means you shouldn’t +2 a
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patch just because you trust the author of a patch - Make sure you
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understand what the implications of a patch might be, or leave the review
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to others. Partial reviews, reviewing code style, for example, can be given
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a +1 instead of a +2. This also applies if you think the patch looks good,
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but may not have the experience to know if there may be unintended
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consequences.
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* If there is still ongoing discussion to a patch, try to wait for a
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conclusion to the discussion before submitting it to the tree. If you feel
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that someone is just bikeshedding, maybe just state that and give a time
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that the patch will be submitted if no new objections are raised.
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* When working with patch trains, for minor requests it’s acceptable to
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create a fix addressing a comment in another patch at the end of the patch
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train. This minimizes rebases of the patch train while still addressing the
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request. For major problems where the change doesn’t work as intended or
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breaks other platforms, the change really needs to go into the original
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patch.
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2015-12-26 21:33:09 +01:00
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* When bringing in a patch from another git repo, update the original
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git/gerrit tags by prepending the lines with 'Original-'. Marking
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the original text this way makes it much easier to tell what changes
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happened in which repository. This applies to these lines, not the actual
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commit message itself:
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Commit-Id:
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Change-Id:
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Signed-off-by:
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Reviewed-on:
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Tested-by:
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Reviewed-by:
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The script 'util/gitconfig/rebase.sh' can be used to help automate this.
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Other tags such as 'Commit-Queue' can simply be removed.
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2020-05-17 22:10:53 +02:00
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* Check if there's documentation that needs to be updated to remain current
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after your change. If there's no documentation for the part of coreboot
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you're working on, consider adding some.
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* When contributing a significant change to core parts of the code base (such
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as the boot state machine or the resource allocator), or when introducing
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a new way of doing something that you think is worthwhile to apply across
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the tree (e.g. board variants), please bring up your design on the [mailing
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list](../community/forums.md). When changing behavior substantially, an
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explanation of what changes and why may be useful to have, either in the
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commit message or, if the discussion of the subject matter needs way more
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space, in the documentation. Since "what we did in the past and why it isn't
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appropriate anymore" isn't the most useful reading several years down the road,
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such a description could be put into the release notes for the next version
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(that you can find in Documentation/releases/) where it will inform people
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now without cluttering up the regular documentation, and also gives a nice
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shout-out to your contribution by the next release.
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2015-10-29 19:43:10 +01:00
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2018-09-30 20:10:04 +02:00
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Expectations contributors should have
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-------------------------------------
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2015-10-29 19:43:10 +01:00
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* Don't expect that people will review your patch unless you ask them to.
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Adding other people as reviewers is the easiest way. Asking for reviews for
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individual patches in the IRC channel, or by sending a direct request to an
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individual through your favorite messenger is usually the best way to get a
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patch reviewed quickly.
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* Don't expect that your patch will be submitted immediately after getting
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a +2. As stated previously, non-trivial patches should wait at least 24
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hours before being submitted. That said, if you feel that your patch or
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series of patches has been sitting longer than needed, you can ask for it
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to be submitted on IRC, or comment that it's ready for submission in the
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patch. This will move it to the top of the list where it's more likely to
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be noticed and acted upon.
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* Reviews are about the code. It's easy to take it personally when someone
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is criticising your code, but the whole idea is to get better code into our
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codebase. Again, this also applies in the other direction: review code,
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criticize code, but don’t make it personal.
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2021-04-12 16:19:38 +02:00
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Gerrit user roles
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-----------------
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There are a few relevant roles a user can have on Gerrit:
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- The anonymous user can check out source code.
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- A registered user can also comment and give "+1" and "-1" code reviews.
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- A reviewer can also give "+2" code reviews.
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- A core developer can also give "-2" (that is, blocking) code reviews
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and submit changes.
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Anybody can register an account on our instance, using either an
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OpenID provider or OAuth through GitHub or Google.
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The reviewer group is still quite open: Any core developer can add
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registered users to that group and should do so once some activity
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(commits, code reviews, and so on) has demonstrated rough knowledge
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of how we handle things.
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A core developer should be sufficiently well established in the
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community so that they feel comfortable when submitting good patches,
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when asking for improvements to less good patches and reasonably
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uncomfortable when -2'ing patches. They're typically the go-to
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person for _some_ part of the coreboot tree and ideally listed as its
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maintainer in our MAINTAINERS registry. To become part of this group,
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a candidate developer who already demonstrated proficiency with the
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code base as a reviewer should be nominated, by themselves or others,
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at the regular [coreboot leadership meetings](../community/forums.md)
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where a decision is made.
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|
2015-10-29 19:43:10 +01:00
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Requests for clarification and suggestions for updates to these guidelines
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should be sent to the coreboot mailing list at <coreboot@coreboot.org>.
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