F43 Change Proposal: Erlang 27 (self-contained)

Wiki - https://fedoraproject.org/wiki/Changes/Erlang_27
Discussion thread -
https://discussion.fedoraproject.org/t/f43-change-proposal-erlang-27-self-contained/154985

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes
process, proposals are publicly announced in order to receive
community feedback. This proposal will only be implemented if approved
by the Fedora Engineering Steering Committee.

== Summary ==
Update Erlang/OTP to version 27.

== Owner ==
* Name: [[User:Peter|Peter Lemenkov]], [[SIGs/Erlang|Fedora Erlang SIG]]
* Email: lemenkov@gmail.com, erlang@lists.fedoraproject.org


== Detailed Description ==
Upgrade Erlang to version 27 which brings a lot of changes. Just a few
highlights [https://www.erlang.org/blog/highlights-otp-27/ from many]:

* Triple-Quoted strings
* Sigils
* The new json module
* Process labels
* New functionality in STDLIB
* New SSL client-side stapling support
* Lots of bugfixes

Aside from this, we plan to further improve quality of Erlang and
related packages. These are shortcomings we want to address:

* Finish switching to rebar3 as a main build tool and deprecate rebar2.
* Improve [[User:Peter/Erlang_Packaging_Guidelines|Erlang Packaging
Guidelines]] and promote it as the official guideline.
* SELinux rules for main Erlang applications (Ejabberd, CouchDB,
RabbitMQ) are still outdated or missing.

== Benefit to Fedora ==
Fedora users, both developers and end-users, will have visible
benefits from using Fedora-provided packages. Namely:

* Improved scalability and robustness.
* Much easier developing and debugging.

== Scope ==
* Proposal owners:
** Upgrade Erlang to the 27 version.
** Upgrade outdated packages:
*** {{package|ejabberd|Ejabberd}}
*** {{package|rabbitmq-server|RabbitMQ}}.
** Package GDB macros for easier coredump debugging (see also
[https://bugzilla.redhat.com/show_bug.cgi?id=663253 this ticket]).
* Other developers: N/A
* Release engineering: TBA
* Policies and guidelines:
** We should promote officially
[[User:Peter/Erlang_Packaging_Guidelines|Erlang Packaging
Guidelines]].
* Trademark approval: N/A (not needed for this Change)

== Upgrade/compatibility impact ==
* N/a

== How To Test ==

* Ensure that high-grade Erlang applications are still working:
{| border="1"
|-
| '''Name''' || '''Tested'''
|-
| {{package|ejabberd}} || {{no}}
|-
| {{package|elixir}} || {{no}}
|-
| {{package|rabbitmq-server}} || {{no}}
|}

* Collect feedback from volunteers regarding their experience with
this Erlang/OTP version

== User Experience ==
Users will get more robust, scalable, and fast Erlang applications.

== Dependencies ==

The following packages must be rebuilt: NIF-libraries.

== Contingency Plan ==
* Contingency mechanism: None necessary. Instead of falling back to
the previous version we should fix existing packages in order to help
the Community. We should also monitor upstream development process for
potentially discovered issues and proactively apply patches (as we
already did with [[Features/Erlang_R14|Erlang R14]],
[[Features/Erlang_R15|Erlang R15]], [[Features/Erlang_R16|Erlang
R16]], [[Changes/BetterErlangSupport|Erlang 17]],
[[Changes/Erlang_18|Erlang 18]], [[Changes/Erlang_19|Erlang 19]],
[[Changes/Erlang_20|Erlang 20]], [[Changes/Erlang_21|Erlang 21]],
[[Changes/Erlang_22|Erlang 22]], [[Changes/Erlang_23|Erlang 23]],
[[Changes/Erlang_24|Erlang 24]], and [[Changes/Erlang_25|Erlang 25]]).
It should be noted that this change consists from an independent or
loosely coupled smaller changes. If we fail to deliver some changes in
time, we should reschedule these exact changes to the future Fedora
release while keeping already implemented ones.
* Contingency deadline: N/A
* Blocks release? N/A
* Blocks product? N/A

== Documentation ==

* [https://www.erlang.org/news/170 Erlang/OTP 27.0 release notes]
* [https://www.erlang.org/news/171 Erlang/OTP 27.1 release notes]
* [https://www.erlang.org/news/172 Erlang/OTP 27.2 release notes]
* [https://www.erlang.org/news/175 Erlang/OTP 27.3 release notes]

== Release Notes ==

Erlang/OTP 25.0 is available in Fedora 43.



--
Aoife Moloney

Fedora Operations Architect

Fedora Project

Matrix: @amoloney:fedora.im

IRC: amoloney

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