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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
#
# Be warned: you'll need over 3.75 GB of free space to download all the dependencies.
#
# 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 Synapse, PostgreSQL and Redis instances by
# running: `devenv up`. To stop them, use Ctrl-C.
#
# 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. Used to fetch the latest
# available versions of packages.
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/v0.6.3";
# Rust toolchain.
rust-overlay.url = "github:oxalica/rust-overlay";
};
outputs = { self, nixpkgs, devenv, systems, rust-overlay, ... } @ inputs:
let
forEachSystem = nixpkgs.lib.genAttrs (import systems);
in {
devShells = forEachSystem (system:
let
overlays = [ (import rust-overlay) ];
pkgs = import nixpkgs {
inherit system overlays;
};
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; [
# The rust toolchain and related tools.
# This will install the "default" profile of rust components.
# https://rust-lang.github.io/rustup/concepts/profiles.html
#
# NOTE: We currently need to set the Rust version unnecessarily high
# in order to work around https://github.com/matrix-org/synapse/issues/15939
(rust-bin.stable."1.70.0".default.override {
# Additionally install the "rust-src" extension to allow diving into the
# Rust source code in an IDE (rust-analyzer will also make use of it).
extensions = [ "rust-src" ];
})
# The rust-analyzer language server implementation.
rust-analyzer
# 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
# For building the Synapse documentation website.
mdbook
# For releasing Synapse
debian-devscripts # (`dch` for manipulating the Debian changelog)
libnotify # (the release script uses `notify-send` to tell you when CI jobs are done)
];
# 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.
#
# * Golang is needed to run the Complement test suite.
# * Perl is needed to run the SyTest test suite.
# * Rust is used for developing and running Synapse.
# It is installed manually with `packages` above.
languages.go.enable = true;
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;
# Configure and start Synapse. Before starting Synapse, this shell code:
# * generates a default homeserver.yaml config file if one does not exist, and
# * ensures a directory containing two additional homeserver config files exists;
# one to configure using the development environment's PostgreSQL as the
# database backend and another for enabling Redis support.
process.before = ''
python -m synapse.app.homeserver -c homeserver.yaml --generate-config --server-name=synapse.dev --report-stats=no
mkdir -p homeserver-config-overrides.d
cat > homeserver-config-overrides.d/database.yaml << EOF
## Do not edit this file. This file is generated by flake.nix
database:
name: psycopg2
args:
user: synapse_user
database: synapse
host: $PGHOST
cp_min: 5
cp_max: 10
EOF
cat > homeserver-config-overrides.d/redis.yaml << EOF
## Do not edit this file. This file is generated by flake.nix
redis:
enabled: true
EOF
'';
# Start synapse when `devenv up` is run.
processes.synapse.exec = "poetry run python -m synapse.app.homeserver -c homeserver.yaml -c homeserver-config-overrides.d";
# Define the perl modules we require to run SyTest.
#
# This list was compiled by cross-referencing https://metacpan.org/
# with the modules defined in './cpanfile' and then finding the
# corresponding Nix packages on https://search.nixos.org/packages.
#
# This was done until `./install-deps.pl --dryrun` produced no output.
env.PERL5LIB = "${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
]}";
}
];
};
});
};
}