TaskChampion Sync-Server

TaskChampion is the task database Taskwarrior uses to store and sync tasks. This repository implements a sync server against which Taskwarrior and other applications embedding TaskChampion can sync.

Status

This repository was spun off from Taskwarrior itself after the 3.0.0 release. It is still under development and currently best described as a reference implementation of the Taskchampion sync protocol.

It is comprised of three crates:

• taskchampion-sync-server-core implements the core of the protocol
• taskchmpaion-sync-server-sqlite implements an SQLite backend for the core
• taskchampion-sync-server implements a simple HTTP server for the protocol

Running the Server

The server is a simple binary that serves HTTP requests on a TCP port. The server does not implement TLS; for public deployments, the recommendation is to use a reverse proxy such as Nginx, haproxy, or Apache httpd.

Using Docker-Compose

Every release of the server generates a Docker image in ghcr.io/gothenburgbitfactory/taskchampion-sync-server. The tags include latest for the latest release, and both minor and patch versions, e.g., 0.5 and 0.5.1.

The docker-compose.yml file in this repository is sufficient to run taskchampion-sync-server, including setting up TLS certificates using Lets Encrypt, thanks to Caddy.

You will need a server with ports 80 and 443 open to the Internet and with a fixed, publicly-resolvable hostname. These ports must be available both to your Taskwarrior clients and to the Lets Encrypt servers.

On that server, download docker-compose.yml from the link above (it is pinned to the latest release) into the current directory. Then run

TASKCHAMPION_SYNC_SERVER_HOSTNAME=taskwarrior.example.com \
TASKCHAMPION_SYNC_SERVER_CLIENT_ID=your-client-id \
docker compose up

The TASKCHAMPION_SYNC_SERVER_CLIENT_ID limits the server to the given client ID; omit it to allow all client IDs.

It can take a few minutes to obtain the certificate; the caddy container will log a message "certificate obtained successfully" when this is complete, or error messages if the process fails. Once this process is complete, configure your .taskrc's to point to the server:

sync.server.url=https://taskwarrior.example.com
sync.server.client_id=your-client-id
sync.encryption_secret=your-encryption-secret

The docker-compose images store data in a docker volume named taskchampion-sync-server_data. This volume contains all of the task data, as well as the TLS certificate information. It will persist over restarts, in a typical Docker installation. The docker containers will start automatically on system startup. See the docker-compose documentation for more information.

Running the Binary

The server is configured with command-line options. See taskchampion-sync-server --help for full details.

The --listen option specifies the interface and port the server listens on. It must contain an IP-Address or a DNS name and a port number. This option is mandatory, but can be repeated to specify multiple interfaces or ports. This value can be specified in environment variable LISTEN, as a comma-separated list of values.

The --data-dir option specifies where the server should store its data. This value can be specified in the environment variable DATA_DIR.

By default, the server will allow all clients and create them in the database on first contact. There are two ways to limit the clients the server will interact with:

• To limit the accepted client IDs, specify them in the environment variable CLIENT_ID, as a comma-separated list of UUIDs. Client IDs can be specified with --allow-client-id, but this should not be used on shared systems, as command line arguments are visible to all users on the system. This convenient option is suitable for personal and small-scale deployments.

• To disable the automatic creation of clients, use the --no-create-clients flag or the CREATE_CLIENTS=false environment variable. You are now responsible for creating clients in the database manually, so this option is more suitable for large scale deployments.

The server only logs errors by default. To add additional logging output, set environment variable RUST_LOG to info to get a log message for every request, or to debug to get more verbose debugging output.

Building

Building From Source

Installing Rust

TaskChampion Sync-Server build has been tested with current Rust stable release version. You can install Rust from your distribution package or use rustup.

rustup default stable

The minimum supported Rust version (MSRV) is given in Cargo.toml. Note that package repositories typically do not have sufficiently new versions of Rust.

If you prefer, you can use the stable version only for installing TaskChampion Sync-Server (you must clone the repository first).

rustup override set stable

Installing TaskChampion Sync-Server

To build TaskChampion Sync-Server binary simply execute the following commands.

git clone https://github.com/GothenburgBitFactory/taskchampion-sync-server.git
cd taskchampion-sync-server
cargo build --release

After build the binary is located in target/release/taskchampion-sync-server.

Building the Container

To build the container execute the following commands.

source .env
docker build \
  --build-arg RUST_VERSION=${RUST_VERSION} \
  --build-arg ALPINE_VERSION=${ALPINE_VERSION} \
  -t taskchampion-sync-server .

Now to run it, simply exec.

docker run -t -d \
  --name=taskchampion \
  -p 8080:8080 \
  taskchampion-sync-server

This start TaskChampion Sync-Server and publish the port to host. Please note that this is a basic run, all data will be destroyed after stop and delete container. You may also set DATA_DIR, CLIENT_ID, or LISTEN with -e, e.g.,

docker run -t -d \
  --name=taskchampion \
  -e LISTEN=0.0.0.0:9000 \
  -p 9000:9000 \
  taskchampion-sync-server