Store disk paths in an associative array

lib/modules/partition.nix

@@ -2,7 +2,6 @@
   let
     inherit (lib) types mkOption;
     diskVarName = "myDisk";
-    diskVar = ''''${${diskVarName}}'';
     isSwap = partition: builtins.elem partition.type ["swap" 19];
 
     fs = {
@@ -20,6 +19,12 @@
     mkDiskType = osDisk: types.submodule (
       { config, name, ... }: {
         options = {
+          id = mkOption {
+            type = types.str;
+            description = "The internal identifier of the disk.";
+            internal = true;
+          };
+
           wipe = mkOption {
             type = types.bool;
             description = "A value indicating whether the disk should be wiped.";
@@ -65,6 +70,8 @@
 
         config =
         let
+          diskVar = ''''${${diskVarName}[${config.id}]}'';
+
           partitions = builtins.foldl'
             (list: predicate: lib.lists.sortOn predicate list)
             (builtins.filter (_: _ != null) (builtins.attrValues config.partitions))
@@ -161,6 +168,8 @@
                 ''sudo sfdisk --part-type ${diskVar} ${toString partition.index} ${mkType partition.type}'')
               partitions);
         in {
+          id = if osDisk then "os" else "disk-${name}";
+
           deviceScript = if osDisk && config.devicePath == null then ''
               ${diskSelector}
             ''