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# A nix flake that sets up a complete Synapse development environment. Dependencies
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# for the SyTest (https://github.com/matrix-org/sytest) and Complement
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# (https://github.com/matrix-org/complement) Matrix homeserver test suites are also
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# installed automatically.
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#
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# You must have already installed nix (https://nixos.org) on your system to use this.
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# nix can be installed on Linux or MacOS; NixOS is not required. Windows is not
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# directly supported, but nix can be installed inside of WSL2 or even Docker
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# containers. Please refer to https://nixos.org/download for details.
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#
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# You must also enable support for flakes in Nix. See the following for how to
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# do so permanently: https://nixos.wiki/wiki/Flakes#Enable_flakes
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#
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# Usage:
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#
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# With nix installed, navigate to the directory containing this flake and run
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# `nix develop --impure`. The `--impure` is necessary in order to store state
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# locally from "services", such as PostgreSQL and Redis.
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#
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# You should now be dropped into a new shell with all programs and dependencies
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# availabile to you!
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#
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# You can start up pre-configured, local PostgreSQL and Redis instances by
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# running: `devenv up`. To stop them, use Ctrl-C.
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#
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# A PostgreSQL database called 'synapse' will be set up for you, along with
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# a PostgreSQL user named 'synapse_user'.
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# The 'host' can be found by running `echo $PGHOST` with the development
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# shell activated. Use these values to configure your Synapse to connect
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# to the local PostgreSQL database. You do not need to specify a password.
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# https://matrix-org.github.io/synapse/latest/postgres
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#
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# All state (the venv, postgres and redis data and config) are stored in
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# .devenv/state. Deleting a file from here and then re-entering the shell
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# will recreate these files from scratch.
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#
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# You can exit the development shell by typing `exit`, or using Ctrl-D.
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#
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# If you would like this development environment to activate automatically
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# upon entering this directory in your terminal, first install `direnv`
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# (https://direnv.net/). Then run `echo 'use flake . --impure' >> .envrc` at
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# the root of the Synapse repo. Finally, run `direnv allow .` to allow the
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# contents of '.envrc' to run every time you enter this directory. Voilà!
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{
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inputs = {
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# Use the master/unstable branch of nixpkgs. The latest stable, 22.11,
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# does not contain 'perl536Packages.NetAsyncHTTP', needed by Sytest.
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nixpkgs.url = "github:NixOS/nixpkgs/master";
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# Output a development shell for x86_64/aarch64 Linux/Darwin (MacOS).
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systems.url = "github:nix-systems/default";
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# A development environment manager built on Nix. See https://devenv.sh.
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devenv.url = "github:cachix/devenv/main";
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# Rust toolchains and rust-analyzer nightly.
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fenix = {
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url = "github:nix-community/fenix";
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inputs.nixpkgs.follows = "nixpkgs";
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};
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};
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outputs = { self, nixpkgs, devenv, systems, ... } @ inputs:
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let
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forEachSystem = nixpkgs.lib.genAttrs (import systems);
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in {
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devShells = forEachSystem (system:
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let
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pkgs = nixpkgs.legacyPackages.${system};
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in {
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# Everything is configured via devenv - a nix module for creating declarative
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# developer environments. See https://devenv.sh/reference/options/ for a list
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# of all possible options.
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default = devenv.lib.mkShell {
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inherit inputs pkgs;
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modules = [
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{
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# Make use of the Starship command prompt when this development environment
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# is manually activated (via `nix develop --impure`).
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# See https://starship.rs/ for details on the prompt itself.
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starship.enable = true;
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# Configure packages to install.
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# Search for package names at https://search.nixos.org/packages?channel=unstable
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packages = with pkgs; [
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# Native dependencies for running Synapse.
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icu
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libffi
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libjpeg
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libpqxx
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libwebp
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libxml2
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libxslt
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sqlite
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# Native dependencies for unit tests (SyTest also requires OpenSSL).
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openssl
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# Native dependencies for running Complement.
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olm
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];
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# Install Python and manage a virtualenv with Poetry.
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languages.python.enable = true;
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languages.python.poetry.enable = true;
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# Automatically activate the poetry virtualenv upon entering the shell.
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languages.python.poetry.activate.enable = true;
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# Install all extra Python dependencies; this is needed to run the unit
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# tests and utilitise all Synapse features.
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languages.python.poetry.install.arguments = ["--extras all"];
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# Install the 'matrix-synapse' package from the local checkout.
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languages.python.poetry.install.installRootPackage = true;
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# This is a work-around for NixOS systems. NixOS is special in
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# that you can have multiple versions of packages installed at
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# once, including your libc linker!
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#
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# Some binaries built for Linux expect those to be in a certain
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# filepath, but that is not the case on NixOS. In that case, we
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# force compiling those binaries locally instead.
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env.POETRY_INSTALLER_NO_BINARY = "ruff";
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# Install dependencies for the additional programming languages
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# involved with Synapse development.
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#
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# * Rust is used for developing and running Synapse.
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# * Golang is needed to run the Complement test suite.
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# * Perl is needed to run the SyTest test suite.
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languages.go.enable = true;
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languages.rust.enable = true;
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languages.rust.version = "stable";
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languages.perl.enable = true;
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# Postgres is needed to run Synapse with postgres support and
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# to run certain unit tests that require postgres.
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services.postgres.enable = true;
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# On the first invocation of `devenv up`, create a database for
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# Synapse to store data in.
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services.postgres.initdbArgs = ["--locale=C" "--encoding=UTF8"];
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services.postgres.initialDatabases = [
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{ name = "synapse"; }
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];
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# Create a postgres user called 'synapse_user' which has ownership
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# over the 'synapse' database.
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services.postgres.initialScript = ''
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CREATE USER synapse_user;
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ALTER DATABASE synapse OWNER TO synapse_user;
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'';
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# Redis is needed in order to run Synapse in worker mode.
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services.redis.enable = true;
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# Define the perl modules we require to run SyTest.
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#
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# This list was compiled by cross-referencing https://metacpan.org/
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# with the modules defined in './cpanfile' and then finding the
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# corresponding nix packages on https://search.nixos.org/packages.
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#
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# This was done until `./install-deps.pl --dryrun` produced no output.
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env.PERL5LIB = "${with pkgs.perl536Packages; makePerlPath [
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DBI
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ClassMethodModifiers
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CryptEd25519
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DataDump
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DBDPg
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DigestHMAC
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DigestSHA1
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EmailAddressXS
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EmailMIME
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EmailSimple # required by Email::Mime
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EmailMessageID # required by Email::Mime
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EmailMIMEContentType # required by Email::Mime
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TextUnidecode # required by Email::Mime
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ModuleRuntime # required by Email::Mime
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EmailMIMEEncodings # required by Email::Mime
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FilePath
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FileSlurper
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Future
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GetoptLong
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HTTPMessage
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IOAsync
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IOAsyncSSL
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IOSocketSSL
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NetSSLeay
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JSON
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ListUtilsBy
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ScalarListUtils
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ModulePluggable
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NetAsyncHTTP
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MetricsAny # required by Net::Async::HTTP
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NetAsyncHTTPServer
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StructDumb
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URI
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YAMLLibYAML
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]}";
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}
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];
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};
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});
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};
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}
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