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docs: document git/python/Ubuntu/Debian release schedules

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Going purely on upstream package release cycles doesn't tell the whole
story: a lot of people run LTS distros which will have older versions
of software we want to support.

Build out a table for us to quickly reference when making decisions as
to what versions of git/python we want to support, and when we can drop
them.  This will also help to refer users to as why we made a specific
decision that might be affecting them.

Change-Id: I7aea24bbefd50e358aeacf11e8c15a346c8fb8a9
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254572
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: David Pursehouse <dpursehouse@collab.net>
This commit is contained in:
Mike Frysinger 2020-02-11 18:43:34 -05:00
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@ -161,7 +161,91 @@ You can create a short changelog using the command:
$ git log --format="%h (%aN) %s" --no-merges origin/stable..$r $ git log --format="%h (%aN) %s" --no-merges origin/stable..$r
``` ```
## Project References
Here's a table showing the relationship of major tools, their EOL dates, and
their status in Ubuntu & Debian.
Those distros tend to be good indicators of how long we need to support things.
Things in bold indicate stuff to take note of, but does not guarantee that we
still support them.
Things in italics are things we used to care about but probably don't anymore.
| Date | EOL | [Git][rel-g] | [Python][rel-p] | [Ubuntu][rel-u] / [Debian][rel-d] | Git | Python |
|:--------:|:------------:|--------------|-----------------|-----------------------------------|-----|--------|
| Oct 2008 | *Oct 2013* | | 2.6.0 | *10.04 Lucid* - 10.10 Maverick / *Squeeze* |
| Dec 2008 | *Feb 2009* | | 3.0.0 |
| Feb 2009 | *Mar 2012* | | | Debian 5 Lenny | 1.5.6.5 | 2.5.2 |
| Jun 2009 | *Jun 2016* | | 3.1.0 | *10.04 Lucid* - 10.10 Maverick / *Squeeze* |
| Feb 2010 | *Oct 2012* | 1.7.0 | | *10.04 Lucid* - *12.04 Precise* - 12.10 Quantal |
| Apr 2010 | *Apr 2015* | | | *10.04 Lucid* | 1.7.0.4 | 2.6.5 3.1.2 |
| Jul 2010 | *Dec 2019* | | **2.7.0** | 11.04 Natty - **<current>** |
| Oct 2010 | | | | 10.10 Maverick | 1.7.1 | 2.6.6 3.1.3 |
| Feb 2011 | *Feb 2016* | | | Debian 6 Squeeze | 1.7.2.5 | 2.6.6 3.1.3 |
| Apr 2011 | | | | 11.04 Natty | 1.7.4 | 2.7.1 3.2.0 |
| Oct 2011 | *Feb 2016* | | 3.2.0 | 11.04 Natty - 12.10 Quantal |
| Oct 2011 | | | | 11.10 Ocelot | 1.7.5.4 | 2.7.2 3.2.2 |
| Apr 2012 | *Apr 2019* | | | *12.04 Precise* | 1.7.9.5 | 2.7.3 3.2.3 |
| Sep 2012 | *Sep 2017* | | 3.3.0 | 13.04 Raring - 13.10 Saucy |
| Oct 2012 | *Dec 2014* | 1.8.0 | | 13.04 Raring - 13.10 Saucy |
| Oct 2012 | | | | 12.10 Quantal | 1.7.10.4 | 2.7.3 3.2.3 |
| Apr 2013 | | | | 13.04 Raring | 1.8.1.2 | 2.7.4 3.3.1 |
| May 2013 | *May 2018* | | | Debian 7 Wheezy | 1.7.10.4 | 2.7.3 3.2.3 |
| Oct 2013 | | | | 13.10 Saucy | 1.8.3.2 | 2.7.5 3.3.2 |
| Feb 2014 | *Dec 2014* | **1.9.0** | | **14.04 Trusty** |
| Mar 2014 | *Mar 2019* | | **3.4.0** | **14.04 Trusty** - 15.10 Wily / **Jessie** |
| Apr 2014 | **Apr 2022** | | | **14.04 Trusty** | 1.9.1 | 2.7.5 3.4.0 |
| May 2014 | *Dec 2014* | 2.0.0 |
| Aug 2014 | *Dec 2014* | **2.1.0** | | 14.10 Utopic - 15.04 Vivid / **Jessie** |
| Oct 2014 | | | | 14.10 Utopic | 2.1.0 | 2.7.8 3.4.2 |
| Nov 2014 | *Sep 2015* | 2.2.0 |
| Feb 2015 | *Sep 2015* | 2.3.0 |
| Apr 2015 | *May 2017* | 2.4.0 |
| Apr 2015 | **Jun 2020** | | | **Debian 8 Jessie** | 2.1.4 | 2.7.9 3.4.2 |
| Apr 2015 | | | | 15.04 Vivid | 2.1.4 | 2.7.9 3.4.3 |
| Jul 2015 | *May 2017* | 2.5.0 | | 15.10 Wily |
| Sep 2015 | *May 2017* | 2.6.0 |
| Sep 2015 | **Sep 2020** | | **3.5.0** | **16.04 Xenial** - 17.04 Zesty / **Stretch** |
| Oct 2015 | | | | 15.10 Wily | 2.5.0 | 2.7.9 3.4.3 |
| Jan 2016 | *Jul 2017* | **2.7.0** | | **16.04 Xenial** |
| Mar 2016 | *Jul 2017* | 2.8.0 |
| Apr 2016 | **Apr 2024** | | | **16.04 Xenial** | 2.7.4 | 2.7.11 3.5.1 |
| Jun 2016 | *Jul 2017* | 2.9.0 | | 16.10 Yakkety |
| Sep 2016 | *Sep 2017* | 2.10.0 |
| Oct 2016 | | | | 16.10 Yakkety | 2.9.3 | 2.7.11 3.5.1 |
| Nov 2016 | *Sep 2017* | **2.11.0** | | 17.04 Zesty / **Stretch** |
| Dec 2016 | **Dec 2021** | | **3.6.0** | 17.10 Artful - **18.04 Bionic** - 18.10 Cosmic |
| Feb 2017 | *Sep 2017* | 2.12.0 |
| Apr 2017 | | | | 17.04 Zesty | 2.11.0 | 2.7.13 3.5.3 |
| May 2017 | *May 2018* | 2.13.0 |
| Jun 2017 | **Jun 2022** | | | **Debian 9 Stretch** | 2.11.0 | 2.7.13 3.5.3 |
| Aug 2017 | *Dec 2019* | 2.14.0 | | 17.10 Artful |
| Oct 2017 | *Dec 2019* | 2.15.0 |
| Oct 2017 | | | | 17.10 Artful | 2.14.1 | 2.7.14 3.6.3 |
| Jan 2018 | *Dec 2019* | 2.16.0 |
| Apr 2018 | *Dec 2019* | 2.17.0 | | **18.04 Bionic** |
| Apr 2018 | **Apr 2028** | | | **18.04 Bionic** | 2.17.0 | 2.7.15 3.6.5 |
| Jun 2018 | *Dec 2019* | 2.18.0 |
| Jun 2018 | **Jun 2023** | | 3.7.0 | 19.04 Disco - **20.04 Focal** / **Buster** |
| Sep 2018 | *Dec 2019* | 2.19.0 | | 18.10 Cosmic |
| Oct 2018 | | | | 18.10 Cosmic | 2.19.1 | 2.7.15 3.6.6 |
| Dec 2018 | *Dec 2019* | **2.20.0** | | 19.04 Disco / **Buster** |
| Feb 2019 | *Dec 2019* | 2.21.0 |
| Apr 2019 | | | | 19.04 Disco | 2.20.1 | 2.7.16 3.7.3 |
| Jun 2019 | | 2.22.0 |
| Jul 2019 | **Jul 2024** | | | **Debian 10 Buster** | 2.20.1 | 2.7.16 3.7.3 |
| Aug 2019 | | 2.23.0 |
| Oct 2019 | **Oct 2024** | | 3.8.0 |
| Oct 2019 | | | | 19.10 Eoan | 2.20.1 | 2.7.17 3.7.5 |
| Nov 2019 | | 2.24.0 |
| Jan 2020 | | 2.25.0 | | **20.04 Focal** |
| Apr 2020 | **Apr 2030** | | | **20.04 Focal** | 2.25.0 | 2.7.17 3.7.5 |
[rel-d]: https://en.wikipedia.org/wiki/Debian_version_history
[rel-g]: https://en.wikipedia.org/wiki/Git#Releases
[rel-p]: https://en.wikipedia.org/wiki/History_of_Python#Table_of_versions
[rel-u]: https://en.wikipedia.org/wiki/Ubuntu_version_history#Table_of_versions
[example announcement]: https://groups.google.com/d/topic/repo-discuss/UGBNismWo1M/discussion [example announcement]: https://groups.google.com/d/topic/repo-discuss/UGBNismWo1M/discussion
[repo-discuss@googlegroups.com]: https://groups.google.com/forum/#!forum/repo-discuss [repo-discuss@googlegroups.com]: https://groups.google.com/forum/#!forum/repo-discuss
[go/repo-release]: https://goto.google.com/repo-release [go/repo-release]: https://goto.google.com/repo-release