#!/usr/bin/env bash set -euo pipefail # This script demonstrates how to setup a nix-bitcoin node with krops. # The node is deployed to a minimal NixOS QEMU VM. # Running this script leaves no traces on your host system. # This demo is a template for your own experiments. # Run with option `--interactive` or `-i` to start a shell for interacting with # the node. # MAKE SURE TO REPLACE the SSH identity file if you use this script for # anything serious. if [[ ! -v NIX_BITCOIN_EXAMPLES_DIR ]]; then echo "Running script in nix shell env..." cd "${BASH_SOURCE[0]%/*}" exec nix-shell --run "./${BASH_SOURCE[0]##*/} $*" else cd "$NIX_BITCOIN_EXAMPLES_DIR" fi source qemu-vm/run-vm.sh echo "Building the target VM" # Build the initial VM to which the nix-bitcoin node is deployed via krops nix-build --out-link $tmpDir/vm - <<'EOF' (import { configuration = { config, lib, ... }: { imports = [ ]; services.openssh.enable = true; # Silence the following warning that appears when deploying via krops: # warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring nix.nixPath = lib.mkForce []; system.stateVersion = config.system.nixos.release; }; }).config.system.build.vm EOF vmNumCPUs=4 vmMemoryMiB=2048 sshPort=60734 # Start the VM in the background runVM $tmpDir/vm $vmNumCPUs $vmMemoryMiB $sshPort # Build the krops deploy script export sshPort nix-build --out-link $tmpDir/krops-deploy - <<'EOF' let krops = (import {}).krops; extraSources = { # Skip uploading nixpkgs to the target node. # This works because /nix/store is shared with the target VM. nixpkgs.symlink = toString ; nixos-config.file = toString ; qemu-vm.file = toString ; }; in krops.pkgs.krops.writeCommand "krops-deploy" { source = import { inherit extraSources krops; }; force = true; target = { user = "root"; host = "127.0.0.1"; port = builtins.getEnv "sshPort"; extraOptions = [ "-i" (toString ) "-oConnectTimeout=1" "-oStrictHostKeyChecking=no" "-oUserKnownHostsFile=/dev/null" "-oLogLevel=ERROR" "-oControlMaster=auto" "-oControlPath=${builtins.getEnv "tmpDir"}/ssh-connection" "-oControlPersist=60" ]; }; # "test" instead of "switch" to avoid installing a bootloader which # is not possible in this VM command = targetPath: '' nixos-rebuild test -I /var/src ''; } EOF echo "Building the nix-bitcoin node" # Pre-build the nix-bitcoin node outside of the VM to save some time nix-build --out-link $tmpDir/store-paths -E ' let system = (import { configuration = ; }).system; pkgsUnstable = (import ).nixpkgs-unstable; pkgs = import {}; in pkgs.closureInfo { rootPaths = [ system pkgsUnstable ]; } ' > /dev/null vmWaitForSSH # Add the store paths that include the nix-bitcoin node # to the nix store db in the VM c "nix-store --load-db < $(realpath $tmpDir/store-paths)/registration" echo echo "Deploy with krops" $tmpDir/krops-deploy echo echo "Bitcoind service:" c systemctl status bitcoind echo echo "Bitcoind network:" c bitcoin-cli getnetworkinfo echo echo "lightning-cli state:" c lightning-cli getinfo echo echo "Node info:" c nodeinfo case ${1:-} in -i|--interactive) . start-bash-session.sh ;; esac # Cleanup happens at exit (defined in qemu-vm/run-vm.sh)