minor improvements

- README:
  - Add RTL

- examples/configuration.nix:
  - Fix comment

- btcpayserver.nix:
  - Use nbLib.addressWithPort
  - Embed optionalString like the other optionalStrings

- clboss.nix:
  - Improve description

- clightning.nix:
  - Option `extraConfig`: Add example, improve description.
  - Disable `log-timestamps`. Timestamps are already logged via journald.
  - Simplify `preStart` script

- electrs.nix:
  - Use `port` description wording like in other services.

README.md

@@ -69,6 +69,7 @@ NixOS modules ([src](modules/modules.nix))
     * [Lightning Pool](https://github.com/lightninglabs/pool)
     * [charge-lnd](https://github.com/accumulator/charge-lnd): policy-based channel fee manager
     * [lndconnect](https://github.com/LN-Zap/lndconnect) via a REST onion service
+  * [Ride The Lightning](https://github.com/Ride-The-Lightning/RTL): web interface for `lnd` and `clightning`
   * [spark-wallet](https://github.com/shesek/spark-wallet)
   * [electrs](https://github.com/romanz/electrs)
   * [btcpayserver](https://github.com/btcpayserver/btcpayserver)

examples/configuration.nix

@@ -16,7 +16,7 @@
     # See the comments at the top of `hardened-extended.nix` for further details.
     # <nix-bitcoin/modules/presets/hardened-extended.nix>
 
-    # FIXME: Uncomment next line to import your hardware configuration. If so,
+    # FIXME: Uncomment the next line to import your hardware configuration. If so,
     # add the hardware configuration file to the same directory as this file.
     #./hardware-configuration.nix
   ];

modules/btcpayserver.nix

@@ -186,7 +186,7 @@ in {
     };
 
     systemd.services.btcpayserver = let
-      nbExplorerUrl = "http://${cfg.nbxplorer.address}:${toString cfg.nbxplorer.port}/";
+      nbExplorerUrl = "http://${nbLib.addressWithPort cfg.nbxplorer.address cfg.nbxplorer.port}/";
       nbExplorerCookie = "${cfg.nbxplorer.dataDir}/${bitcoind.makeNetworkName "Main" "RegTest"}/.cookie";
       configFile = builtins.toFile "config" (''
         network=${bitcoind.network}
@@ -196,7 +196,8 @@ in {
         btcexplorerurl=${nbExplorerUrl}
         btcexplorercookiefile=${nbExplorerCookie}
         postgres=User ID=${cfg.btcpayserver.user};Host=/run/postgresql;Database=btcpaydb
-        ${optionalString (cfg.btcpayserver.rootpath != null) "rootpath=${cfg.btcpayserver.rootpath}"}
+      '' + optionalString (cfg.btcpayserver.rootpath != null) ''
+        rootpath=${cfg.btcpayserver.rootpath}
       '' + optionalString (cfg.btcpayserver.lightningBackend == "clightning") ''
         btclightning=type=clightning;server=unix:///${cfg.clightning.dataDir}/bitcoin/lightning-rpc
       '' + optionalString cfg.btcpayserver.lbtc ''

modules/clightning-plugins/clboss.nix

@@ -9,7 +9,9 @@ let cfg = config.services.clightning.plugins.clboss; in
       type = types.ints.positive;
       default = 30000;
       description = ''
-        Specify target amount (in satoshi) that CLBOSS will leave onchain.
+        Target amount (in satoshi) that CLBOSS will leave on-chain.
+        clboss will only open new channels if this amount is smaller than
+        the funds in your clightning wallet.
       '';
     };
     package = mkOption {

modules/clightning.nix

@@ -43,7 +43,16 @@ let
     extraConfig = mkOption {
       type = types.lines;
       default = "";
-      description = "Extra lines appended to the configuration file.";
+      example = ''
+        alias=mynode
+      '';
+      description = ''
+        Extra lines appended to the configuration file.
+
+        See all available options at
+        https://github.com/ElementsProject/lightning/blob/master/doc/lightningd-config.5.md
+        or by running `lightningd --help`.
+      '';
     };
     user = mkOption {
       type = types.str;
@@ -88,6 +97,7 @@ let
     bitcoin-rpcport=${toString config.services.bitcoind.rpc.port}
     bitcoin-rpcuser=${config.services.bitcoind.rpc.users.public.name}
     rpc-file-mode=0660
+    log-timestamps=false
     ${cfg.extraConfig}
   '';
 
@@ -123,13 +133,14 @@ in {
       preStart = ''
         # The RPC socket has to be removed otherwise we might have stale sockets
         rm -f ${cfg.networkDir}/lightning-rpc
-        install -m 640 ${configFile} '${cfg.dataDir}/config'
+        umask u=rw,g=r,o=
         {
+          cat ${configFile}
           echo "bitcoin-rpcpassword=$(cat ${config.nix-bitcoin.secretsDir}/bitcoin-rpcpassword-public)"
           ${optionalString (cfg.getPublicAddressCmd != "") ''
             echo "announce-addr=$(${cfg.getPublicAddressCmd}):${toString publicPort}"
           ''}
-        } >> '${cfg.dataDir}/config'
+        } > '${cfg.dataDir}/config'
       '';
       serviceConfig = nbLib.defaultHardening // {
         ExecStart = "${nbPkgs.clightning}/bin/lightningd --lightning-dir=${cfg.dataDir}";

modules/electrs.nix

@@ -12,7 +12,7 @@ let
     port = mkOption {
       type = types.port;
       default = 50001;
-      description = "RPC port.";
+      description = "Port to listen for RPC connections.";
     };
     dataDir = mkOption {
       type = types.path;