add clanlib.nix to make stuff more readable

flake.nix

@@ -169,6 +169,7 @@
           inherit private_assets;
           assets = ./nixos/assets;
           factsGenerator = clan-fact-generators.lib { inherit pkgs; };
+          clanLib = import ./nixos/lib/clanlib.nix { inherit (pkgs) lib; machineDir = ./machines; } ;
         };
       };
 

nixos/components/network/syncthing.nix

@@ -1,10 +1,7 @@
-{ config, lib, pkgs, factsGenerator, ... }:
+{ config, lib, pkgs, factsGenerator, clanLib, ... }:
 let
-  machineDir = "${config.clanCore.clanDir}/machines";
-  syncthingPub = machine:
-    lib.removeSuffix "\n"
-      (builtins.readFile "${machineDir}/${machine}/facts/syncthing.pub");
-  zerotierIp = machine: (builtins.readFile "${machineDir}/${machine}/facts/zerotier-ip");
+  syncthingPub = clanLib.readFact "syncthing.pub";
+  zerotierIp = clanLib.readFact "zerotier-ip";
 in
 with lib; {
 
@@ -21,12 +18,6 @@ with lib; {
     cert = config.clanCore.facts.services.syncthing.secret."syncthing.cert".path;
     settings.devices =
       let
-        #machineDir = "${config.clanCore.clanDir}/machines";
-        #syncthingPub = machine:
-        #  lib.removeSuffix "\n"
-        #    (builtins.readFile "${machineDir}/${machine}/facts/syncthing.pub");
-        #zerotierIp = machine: (builtins.readFile "${machineDir}/${machine}/facts/zerotier-ip");
-
         zeroDevice = machine: {
           "${machine}" = {
             name = machine;

nixos/components/network/zerotier.nix

@@ -1,25 +1,23 @@
-{ lib, config, ... }:
+{ lib, config, clanLib, ... }:
 let
-  machineDir = "${config.clanCore.clanDir}/machines/";
-  publicKey = machine: (builtins.readFile "${machineDir}/${machine}/facts/ssh.id_ed25519.pub");
-  machinesFileSet = builtins.readDir machineDir;
-  machines = lib.mapAttrsToList (name: _: name) machinesFileSet;
+  machines = clanLib.allMachineNames;
+  publicKey = clanLib.readFact "ssh.id_ed25519.pub";
   tld = config.clan.static-hosts.topLevelDomain;
-  knownHosts = lib.mapAttrs
-    (name: _:
+
+  knownHosts = lib.genAttrs machines
+    (machine:
       {
         hostNames = [
-          "[${name}]:2222"
-          "[${name}.${tld}]:2222"
-          "[${name}.private]:2222"
-          "${name}"
-          "${name}.${tld}"
-          "${name}.private"
+          "[${machine}]:2222"
+          "[${machine}.${tld}]:2222"
+          "[${machine}.private]:2222"
+          "${machine}"
+          "${machine}.${tld}"
+          "${machine}.private"
         ];
-        publicKey = publicKey name;
+        publicKey = publicKey machine;
       }
-    )
-    machinesFileSet;
+    );
 in
 {
   services.openssh.knownHosts = knownHosts;

nixos/lib/clanlib.nix

@@ -0,0 +1,33 @@
+{lib, machineDir, ... }:
+let
+
+  allMachineNames =
+    let
+      #machineDir = "${config.clanCore.clanDir}/machines/";
+      #machineDir = ../../machines;
+      machines = lib.mapAttrsToList (name: _: name) (builtins.readDir machineDir);
+    in
+    machines;
+
+  getFactPath = fact: machine:
+    "${machineDir}/${machine}/facts/${fact}";
+
+  readFact = fact: machine:
+    let
+      path = getFactPath fact machine;
+    in
+    if builtins.pathExists path then
+      builtins.readFile path
+    else
+      null;
+
+  readFactFromAllMachines = fact:
+    let
+      machines = allMachineNames;
+      facts = lib.genAttrs machines (readFact fact);
+      filteredFacts = lib.filterAttrs (_machine: fact: fact != null) facts;
+    in
+    filteredFacts;
+
+in
+{ inherit allMachineNames getFactPath readFact readFactFromAllMachines; }