[ruby-core:102843] [Ruby master Misc#17720] Cirrus CI to check non-x86_64 architecture cases by own machines

Issue #17720 has been updated by naruse (Yui NARUSE).


> While we have RubyCI, I think we still have a motivation to run a CI on non-x86_64 architectures at a pull-request timing.

Yes, we want non-x86_64 CIs with cheaper (maintenance/money) cost.
PR timing CI is desired rather than cron-based RubyCI.

> When checking GitHub Actions, I do not feel it will happen soon on GitHub Actions [3].

Ah..., I didn't know GitHub Actions Self-hosted runner doesn't support ppc64...

> Cirrus CI's persistent worker

It sounds interesting... I'll discuss with other core people.

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Misc #17720: Cirrus CI to check non-x86_64 architecture cases by own machines
https://bugs.ruby-lang.org/issues/17720#change-90901

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
----------------------------------------
Hello!

This ticket is related to the tickets #16234 #16360. But I opened a new ticket because it is related to general non-x86_64 architecture CI cases.

I have a suggestion.

I see the `.travis.yml` was removed [1], and I also saw another open source project remove their `.travis.yml` because they could not get the credits to continue to run Travis [2]. I feel Travis is not really a possible option for every open source project for now.

While we have RubyCI, I think we still have a motivation to run a CI on non-x86_64 architectures at a pull-request timing. So, I investigated alternative CI. When checking GitHub Actions, I do not feel it will happen soon on GitHub Actions [3]. Then I found an interesting CI called "Cirrus CI", that might enable us to run CI on non-x86_64 architectures such as Mac M1 (arm) ppc64le and s390x beyond the cloud.

Cirrus CI has 2 types of features: "cloud" and "persistent workers". I see the Cirrus CI "cloud" feature has been used in the QEMU and podman projects [4][5]. It has a unique freeBSD host. However the remarkable feature for the Ruby project is the "persistent workers" [6] announced a few months ago, that is beyond the cloud. Because this feature enables us to use our own machines as a CI running host. You can see the examples running the CI with the machines such as Mac M1, iPhone, ppc64le and s390x on the page [6]. Maybe the used machine does not even have the global static IP. You can see other articles [7][8] too.

I can see some benefits to start Cirrus CI for the Ruby project.

* Possibly we can check Mac M1 (arm), ppc64le, s390x cases using machines used in RubyCI [9] and someone's machine such as @ReiOdaira's ppc64le/s390x machines at the pull-request timing.
* When we face the CI issue, we can login to the machine and use the interactive debugging tool such as gdb to fix it.
* The config file is YAML format and it has the matrix feature [10]. We are familiar with the YAML and matrix.

What do you think? Positive or negative?
Thank you.

[1] ruby removed .travis.yml: https://github.com/ruby/ruby/commit/6b978d542704a5614af5e9375c4b31b8d2618652
[2] simde removed .travis.yml: https://github.com/simd-everywhere/simde/commit/17a27e7f2c3114225899f2ace14010cbbb2139b5
[3] GitHub Actions and ppc64le: https://github.community/t/self-hosted-runner-on-ppc64el-architecture/155337
[4] QEMU: https://gitlab.com/qemu-project/qemu/-/blob/master/.cirrus.yml
[5] Podman: https://github.com/containers/podman/blob/master/.cirrus.yml
[6] The issue ticket of Persistent Workers: https://github.com/cirruslabs/cirrus-ci-docs/issues/263#issuecomment-746900845
[7] Persistent Workers blog: https://medium.com/cirruslabs/announcing-public-beta-of-cirrus-ci-persistent-workers-7327a38004be
[8] Persistent Workers guide: https://cirrus-ci.org/guide/persistent-workers/
[9] RubyCI: https://rubyci.org/
[10] Cirrus CI matrix feature: https://cirrus-ci.org/guide/writing-tasks/#matrix-modification




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