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