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- <h1 id="deprecation-policy-for-platform-dependencies"><a class="header" href="#deprecation-policy-for-platform-dependencies">Deprecation Policy for Platform Dependencies</a></h1>
- <p>Synapse has a number of platform dependencies, including Python, Rust,
- PostgreSQL and SQLite. This document outlines the policy towards which versions
- we support, and when we drop support for versions in the future.</p>
- <h2 id="policy"><a class="header" href="#policy">Policy</a></h2>
- <p>Synapse follows the upstream support life cycles for Python and PostgreSQL,
- i.e. when a version reaches End of Life Synapse will withdraw support for that
- version in future releases.</p>
- <p>Details on the upstream support life cycles for Python and PostgreSQL are
- documented at <a href="https://endoflife.date/python">https://endoflife.date/python</a> and
- <a href="https://endoflife.date/postgresql">https://endoflife.date/postgresql</a>.</p>
- <p>A Rust compiler is required to build Synapse from source. For any given release
- the minimum required version may be bumped up to a recent Rust version, and so
- people building from source should ensure they can fetch recent versions of Rust
- (e.g. by using <a href="https://rustup.rs/">rustup</a>).</p>
- <p>The oldest supported version of SQLite is the version
- <a href="https://packages.debian.org/buster/libsqlite3-0">provided</a> by
- <a href="https://wiki.debian.org/DebianOldStable">Debian oldstable</a>.</p>
- <h2 id="context"><a class="header" href="#context">Context</a></h2>
- <p>It is important for system admins to have a clear understanding of the platform
- requirements of Synapse and its deprecation policies so that they can
- effectively plan upgrading their infrastructure ahead of time. This is
- especially important in contexts where upgrading the infrastructure requires
- auditing and approval from a security team, or where otherwise upgrading is a
- long process.</p>
- <p>By following the upstream support life cycles Synapse can ensure that its
- dependencies continue to get security patches, while not requiring system admins
- to constantly update their platform dependencies to the latest versions.</p>
- <p>For Rust, the situation is a bit different given that a) the Rust foundation
- does not generally support older Rust versions, and b) the library ecosystem
- generally bump their minimum support Rust versions frequently. In general, the
- Synapse team will try to avoid updating the dependency on Rust to the absolute
- latest version, but introducing a formal policy is hard given the constraints of
- the ecosystem.</p>
- <p>On a similar note, SQLite does not generally have a concept of "supported
- release"; bugfixes are published for the latest minor release only. We chose to
- track Debian's oldstable as this is relatively conservative, predictably updated
- and is consistent with the <code>.deb</code> packages released by Matrix.org.</p>
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