doc: Add "Addressing Issues" section.
* doc/contributing.texi (Addressing Issues): New section. Co-authored-by: Christopher Baines <mail@cbaines.net>
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@ -1419,6 +1419,45 @@ you're confident, it's OK to commit.
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That last part is subject to being adjusted, allowing individuals to commit
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directly on non-controversial changes on parts they’re familiar with.
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@subsection Addressing Issues
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Peer review (@pxref{Submitting Patches}) and tools such as
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@command{guix lint} (@pxref{Invoking guix lint}) and the test suite
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(@pxref{Running the Test Suite}) should catch issues before they are
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pushed. Yet, commits that ``break'' functionality might occasionally
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go through. When that happens, there are two priorities: mitigating
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the impact, and understanding what happened to reduce the chance of
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similar incidents in the future. The responsibility for both these
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things primarily lies with those involved, but like everything this is
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a group effort.
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Some issues can directly affect all users---for instance because they
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make @command{guix pull} fail or break core functionality, because they
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break major packages (at build time or run time), or because they
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introduce known security vulnerabilities.
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@cindex reverting commits
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The people involved in authoring, reviewing, and pushing such
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commit(s) should be at the forefront to mitigate their impact in a
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timely fashion: by pushing a followup commit to fix it (if possible),
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or by reverting it to leave time to come up with a proper fix, and by
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communicating with other developers about the problem.
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If these persons are unavailable to address the issue in time, other
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committers are entitled to revert the commit(s), explaining in the
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commit log and on the mailing list what the problem was, with the goal
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of leaving time to the original committer, reviewer(s), and author(s)
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to propose a way forward.
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Once the problem has been dealt with, it is the responsibility of
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those involved to make sure the situation is understood. If you are
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working to understand what happened, focus on gathering information
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and avoid assigning any blame. Do ask those involved to describe what
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happened, do not ask them to explain the situation---this would
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implicitly blame them, which is unhelpful. Accountability comes from
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a consensus about the problem, learning from it and improving
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processes so that it's less likely to reoccur.
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@subsection Commit Revocation
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In order to reduce the possibility of mistakes, committers will have
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