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- At the AGM we formed an ad-hoc documentation working group. - One of our ideas was that we should have a last reviewed date for documentation, so that we can periodically implement a review mechanism (GitHub Actions posts to Slack for a regular documentation outdatedness check?) to track how old docs are and ensure they're still relevant. - This is a first step towards that goal, by adding a `last_review_date` to the metadata of all docs with a date of earlier than Homebrew's inception because everything needs reviewing so that we start from a good base!
45 lines
2.8 KiB
Markdown
45 lines
2.8 KiB
Markdown
---
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last_review_date: "1970-01-01"
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---
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# Linux CI in `homebrew/core`
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We currently use Ubuntu 22.04 for bottling in `homebrew/core`.
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## Ubuntu vs. other Linux distributions
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As of 2022, around 77% of our users are using Ubuntu. This is the reason why we have chosen this distribution for our base CI image.
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We have successfully used Ubuntu for CI since version 14.04.
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The Ubuntu LTS versions are supported for 5 years. A new LTS version is released every 2 years.
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Our bottles are compatible with other distributions like Debian/CentOS, even when compiled on Ubuntu.
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## Past and next versions
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We have moved our CI to Ubuntu 22.04
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Moving from Ubuntu 16.04 to Ubuntu 22.04 (and thus skipping version 18.04 and 20.04) took longer than expected.
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We plan to proceed with regular updates from 2022 onwards. We aim to use the latest Ubuntu LTS version for our CI.
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We will start using the latest Ubuntu LTS version for our CI no earlier than 3 months after its release and, ideally, no more than 12 months after its release.
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| Distribution | Glibc | GCC | LTS standard security maintenance |
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|---|---|---|---|
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| Ubuntu 14.04 | 2.19 | 4 | From 2014 to 2017 |
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| Ubuntu 16.04 | 2.23 | 5 | From 2017 to 2022 |
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| Ubuntu 20.04 | 2.31 | 5 | From 2020 to 2025 |
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| Ubuntu 22.04 | 2.35 | 11 | From 2022 to 2027 |
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| Ubuntu 24.04 | 2.39 | 13 | From 2024 to 2029 |
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| Ubuntu 26.04 | ? | ? | ? |
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[Source](https://ubuntu.com/about/release-cycle)
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## Why always use the latest version?
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Homebrew is a rolling-release package manager. We try to ship the newest things as quickly as possible, on macOS and Linux.
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When a formula needs a newer GCC because our host GCC in CI is too old, we needed to make that formula depend on a newer Homebrew GCC. All C++ dependents of that formula immediately acquire a dependency on Homebrew GCC as well. While we have taken the steps to make sure this no longer holds up GCC updates, it still creates a maintenance burden. This problem is more likely for formula which are very actively maintained and try to use newer features of C++. We decided that we shouldn't have a maintenance burden for formulae which are doing the right thing by staying up to date. It makes a lot of sense for Homebrew maintainers to submit upstream fixes when formulae are not working with newer compilers. It makes a lot less sense for Homebrew maintainers to submit fixes because our host compiler is too old.
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Note that `glibc` will need to be installed for more users as their `glibc` version will often be too old: disk space is cheap and we have can handle this situation for our users. This situation will often arise when update to a new LTS version and adoption of the new Ubuntu is still low during the first months. For the same reasons as above: we prefer to stay on the bleeding edge and give our users a gentle nudge to think about updating their OS.
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