Add liquid-swap tool

default.nix

@@ -13,4 +13,5 @@
   elementsd = pkgs.callPackage ./pkgs/elementsd { };
   hwi = pkgs.callPackage ./pkgs/hwi { };
   pylightning = pkgs.python3Packages.callPackage ./pkgs/pylightning { };
+  liquid-swap = pkgs.python3Packages.callPackage ./pkgs/liquid-swap { };
 }

modules/nix-bitcoin.nix

@@ -114,6 +114,7 @@ in {
       alias lightning-cli='sudo -u clightning lightning-cli --lightning-dir=${config.services.clightning.dataDir}'
     '' + (if config.services.liquidd.enable then ''
       alias elements-cli='elements-cli -datadir=${config.services.liquidd.dataDir}'
+      alias liquidswap-cli='liquidswap-cli -c ${config.services.liquidd.dataDir}/elements.conf'
     '' else "");
     # Unfortunately c-lightning doesn't allow setting the permissions of the rpc socket
     # https://github.com/ElementsProject/lightning/issues/1366
@@ -179,7 +180,7 @@ in {
     ++ optionals config.services.lightning-charge.enable [lightning-charge]
     ++ optionals config.services.nanopos.enable [nanopos]
     ++ optionals config.services.nix-bitcoin-webindex.enable [nginx]
-    ++ optionals config.services.liquidd.enable [elementsd]
+    ++ optionals config.services.liquidd.enable [elementsd liquid-swap]
     ++ optionals config.services.spark-wallet.enable [spark-wallet]
     ++ optionals config.services.electrs.enable [electrs]
     ++ optionals (config.services.hardware-wallets.ledger || config.services.hardware-wallets.trezor) [

pkgs/liquid-swap/default.nix

@@ -0,0 +1,17 @@
+{ lib, buildPythonPackage, fetchurl, pyqt5, click }:
+
+buildPythonPackage rec {
+  pname = "liquid-swap";
+  version = "0.0.1";
+
+  # We're only interested in the cli and not the gui but we need to add pyqt5
+  # anyway as a build dependency because liquid-swap's setup.py demands it. See
+  # issue https://github.com/Blockstream/liquid-swap/issues/1.
+  nativeBuildInputs = [ pyqt5 ];
+  propagatedBuildInputs = [ click ];
+
+  src = fetchurl {
+    urls = [ "https://github.com/Blockstream/liquid-swap/archive/release_${version}.tar.gz" ];
+    sha256 = "c90ba78105469273fb799f412caa754d18bfa310984fa11ffd0091f146cca2ba";
+  };
+}