ci: Add basic pull request checker

[imp]

Summary

We check style with my hacky style checker and also make sure the email
address of the author doesn't have noreply in it. Right now the style
checking is only the last 10 commits, which may include other people's
work.

Sponsored by: Netflix

[freebsd_igalic.co]

why are you checking the last ten commits, instead of however many the change has?

.github/workflows/prereq.yml

23

500 seems like a lot of commits to fetch in order to check the last ten

tools/build/check-email.sh

4

this line feels a bit incomplete

[imp]

.github/workflows/prereq.yml

23

We check the branch back to main now.... The different between 500 and 1 or 10 in terms of resources used is small, and 500 is a sane limit...

tools/build/check-email.sh

4

It likely is.

[brooks]

Enabling this as an experiment seems plausible. It might be nice to start with excluding contrib out of the gate to avoid generating too much noise.

tools/build/check-email.sh

4

I suppose you could check for [^@]*@[^@]+\.[^@]+ or the like, but otherwise email address validate is impractical so a simple deny list like this seems fine.

[igor.ostapenko_pm.me]

@imp , regarding your question whether it's possible not to hard-code main. Well, with every iteration my thoughts go deeper and complicate the things :) Nevertheless, I've dumped all my current research results and thoughts about this. Please, find it within the SVG attached (this is draw.io). Excuse me for such, probably, unusual format. I decided to leave the long read as is with the sketches, maybe it will be found helpful to explain the details for others and bring additional ideas.

A respective tl;dr could be as follows:

• I propose to consider a solution to avoid main hardcoding and support any dst branch, this is depicted here: https://github.com/ihoro/freebsd-src/commit/3b6d00f7bbb9e239e5e50687986852b849fd6492
• And there is an optional addition to support a usual push as well. I'm not sure whether it's needed or applicable, but it's shown here: https://github.com/ihoro/freebsd-src/commit/b7e752a18f7740e97eb8feaf95328441408b4104

freebsd-ci-github-action-pr-quick-code-checker.drawio.svg68 KBDownload

[igor.ostapenko_pm.me]

@imp , I've created a PR to trigger the test. It's https://github.com/freebsd/freebsd-src/pull/751. The test passed. It can be simply closed without merge.

[igor.ostapenko_pm.me]

@imp , considering your experience that GitHub fork's main can be left out-of-date (it's obvious project specifics, GitHub is not the origin for committers), if you see that comparing to project mainstream main branch would give better results in more cases, then we could do it. This commit can be used as an example: https://github.com/ihoro/freebsd-src/commit/0d273e225a3ea6e66d4f80e9e1f76c9ddca1454c.

But external contributors, I guess, will usually have their main and some-fix branches in sync, at least, they are expected to be "around" in time to allow fetch --depth=N main find the ancestor. Unfortunately, I'm not aware of the statistics among FreeBSD contributors and committers style of work on GitHub platform to suggest now what could be better.

[imp]

tools/build/check-email.sh

4

Thanks for not suggesting the actual regexp:

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that someone claims is correct on SO....