nix-bitcoin/examples/README.md

## Examples

The easiest way to try out nix-bitcoin is to use one of the provided examples.

### Flakes-based quick start

If you use a Flakes-enabled version of Nix, run the following command to start a minimal
nix-bitcoin QEMU VM:
```bash
nix run github:fort-nix/nix-bitcoin/release
```
The VM (defined in [flake.nix](../flake.nix)) runs in the terminal and has `bitcoind`
and `clightning` installed.\
It leaves no traces (outside of `/nix/store`) on the host system.


### More examples

Clone this repo and enter the examples shell:
```bash
git clone https://github.com/fort-nix/nix-bitcoin
cd nix-bitcoin/examples/
nix-shell
```

The following example scripts set up a nix-bitcoin node according to [`configuration.nix`](configuration.nix) and then
shut down immediately. They leave no traces (outside of `/nix/store`) on the host system.\
By default, [`configuration.nix`](configuration.nix) enables `bitcoind` and `clightning`.

- [`./deploy-container.sh`](deploy-container.sh) creates a [NixOS container](https://github.com/erikarvstedt/extra-container).\
  This is the fastest way to set up a node.\
  Requires: [Nix](https://nixos.org/), a systemd-based Linux distro and root privileges

- [`./deploy-qemu-vm.sh`](deploy-qemu-vm.sh) creates a QEMU VM.\
  Requires: [Nix](https://nixos.org/nix/), Linux

- [`./deploy-krops.sh`](deploy-krops.sh) creates a QEMU VM and deploys a
  nix-bitcoin configuration to it using [krops](https://github.com/krebs/krops).\
  Requires: [Nix](https://nixos.org/nix/), Linux

- [`./deploy-container-minimal.sh`](deploy-container-minimal.sh) creates a
  container defined by [importable-configuration.nix](importable-configuration.nix).\
  You can copy and import this file to use nix-bitcoin in an existing NixOS configuration.\
  The configuration doesn't use the [secure-node.nix](../modules/presets/secure-node.nix) preset.\
  Requires: [Nix](https://nixos.org/), a systemd-based Linux distro and root privileges

Run the examples with option `--interactive` or `-i` to start a shell for interacting with
the node:
```bash
./deploy-qemu-vm.sh -i
```

### Tests
The internal test suite is also useful for exploring features.\
The following `run-tests.sh` commands leave no traces (outside of `/nix/store`) on
the host system.

`run-tests.sh` requires Nix >= 2.10.

```bash
git clone https://github.com/fort-nix/nix-bitcoin
cd nix-bitcoin/test

# Run a node in a VM. No tests are executed.
./run-tests.sh vm
systemctl status bitcoind

# Run a Python test shell inside a VM node
./run-tests.sh debug
print(succeed("systemctl status bitcoind"))
run_test("bitcoind")

# Run a node in a container. Requires systemd and root privileges.
./run-tests.sh container
c systemctl status bitcoind

# Explore a single feature
./run-tests.sh --scenario electrs container

# Run a command in a container
./run-tests.sh --scenario '{
  services.clightning.enable = true;
  nix-bitcoin.nodeinfo.enable = true;
}' container --run c nodeinfo
```
See [`run-tests.sh`](../test/run-tests.sh) for a complete documentation.

#### Flakes
Tests can also be directly accessed via Flakes:
```bash
# Build test
nix build --no-link ..#tests.default

# Run a node in a VM. No tests are executed.
nix run ..#tests.default.vm

# Run a Python test shell inside a VM node
nix run ..#tests.default.run -- --debug

# Run a node in a container. Requires extra-container, systemd and root privileges
nix run ..#tests.default.container
nix run ..#tests.default.containerLegacy # For NixOS with `system.stateVersion` <22.05

# Run a command in a container
nix run ..#tests.default.container -- --run c nodeinfo
nix run ..#tests.default.containerLegacy -- --run c nodeinfo # For NixOS with `system.stateVersion` <22.05
```

### Real-world example
Check the [server repo](https://github.com/fort-nix/nixbitcoin.org) for https://nixbitcoin.org
to see the configuration of a nix-bitcoin node that's used in production.

The commands in `shell.nix` allow you to locally run the node in a VM or container.

### Flakes

Flakes make it easy to include `nix-bitcoin` in an existing NixOS config.
The [flakes example](./flakes/flake.nix) shows how to use `nix-bitcoin` as an input to a system flake.