4 packages raising "undefined variable" error

[adamjohannes]

Hi there,

I'm migrating from Arch to Nix and I'm having a hard time on understanding Flakes.

I installed NixOS on my machine with the "No desktop" option. Then, I followed all the steps provided in the project's README.md file, but, when running sudo nixos-rebuild switch --flake /etc/nixos#nixos-notebook, an error message was raised, stating the following:

error: undefined variable 'surrealist'
at /nix/store/4lq861nz9q972zh5hlipdbzbqyjc1894-source/utils.nix:11:5

I tried to comment out surrealist, since it wasn't a package that important to me, then tried rerunning nixos-rebuild and it raised the same error, undefined variable, for hyprcursor. I found myself in a rabbit hole. I commented out 4 packages in total:

• utils.nix:
  • surrealist
• hyprland.nix:
  • hyprcursor
  • hyprlock
  • hypridle

After removing these packages I ran sudo nixos-rebuild switch --flake /etc/nixos#nixos-notebook again and it finished with the following message:

File system "/boot" is not a FAT EFI System Partition (ESP) file system.
systemd-boot not installed in ESP.
Traceback (most recent call last):
  File "/nix/store/va2wc83qm641zsa2f0hpn2kmi77ncq3x-systemd-boot", line 344 in <module>
    main()
  File "/nix/store/va2wc83qm641zsa2f0hpn2kmi77ncq3x-systemd-boot", line 322 in main
    install_bootloader(args)
  File "/nix/store/va2wc83qm641zsa2f0hpn2kmi77ncq3x-systemd-boot", line 270, in install_bootloader
    raise Exception("could not find any previously installed systemd-boot")
Exception: could not find any previously installed systemd-boot
warning: error(s) occurred while switching to the new configuration

(but it DID generate a new build)

I checked out and it seems that all the packages raising the "undefined variable" error are only available in the unstable branch of nixpkgs, but I noticed that the "flake.nix" already seems to maintain the unstable branch as the input for the flakes. Any idea on how to fix this one?

Also, I tried running sudo nixos-rebuild switch --flake /etc/nixos#nixos-notebook --show-trace > call_stack.txt but the content keeps being printed out in my CLI instead of being redirected to the file. Am I doing something wrong here?

[adamjohannes]

I reinstalled NixOS with the Plasma desktop environment. The issue remains the same.

Here's the trace of sudo nixos-rebuild switch --flake /etc/nixos#nixos-pc --show-trace (I changed the hostname from "nixos-notebook" to "nixos-pc"):

~> sudo nixos-rebuild switch --flake /etc/nixos#nixos-pc --show-trace
building the system configuration...
error:
       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:860:24:

          859|     let f = attrPath:
          860|       zipAttrsWith (n: values:
             |                        ^
          861|         let here = attrPath ++ [n]; in

       … while calling 'g'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:643:19:

          642|           g =
          643|             name: value:
             |                   ^
          644|             if isAttrs value && cond value

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:646:20:

          645|               then recurse (path ++ [name]) value
          646|               else f (path ++ [name]) value;
             |                    ^
          647|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `system.build.toplevel':

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:822:28:

          821|         # Process mkMerge and mkIf properties.
          822|         defs' = concatMap (m:
             |                            ^
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating definitions from `/nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/top-level.nix':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:823:137:

          822|         defs' = concatMap (m:
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          824|         ) defs;

       … while calling 'dischargeProperties'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/top-level.nix:71:12:

           70|   # Replace runtime dependencies
           71|   system = foldr ({ oldDependency, newDependency }: drv:
             |            ^
           72|       pkgs.replaceDependency { inherit oldDependency newDependency drv; }

       … while calling 'foldr'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:52:20:

           51|   */
           52|   foldr = op: nul: list:
             |                    ^
           53|     let

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:59:8:

           58|         else op (elemAt list n) (fold' (n + 1));
           59|     in fold' 0;
             |        ^
           60|

       … while calling 'fold''

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:55:15:

           54|       len = length list;
           55|       fold' = n:
             |               ^
           56|         if n == len

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/top-level.nix:68:10:

           67|     then throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failedAssertions)}"
           68|     else showWarnings config.warnings baseSystem;
             |          ^
           69|

       … while calling 'showWarnings'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/trivial.nix:414:28:

          413|
          414|   showWarnings = warnings: res: lib.foldr (w: x: warn w x) res warnings;
             |                            ^
          415|

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/trivial.nix:414:33:

          413|
          414|   showWarnings = warnings: res: lib.foldr (w: x: warn w x) res warnings;
             |                                 ^
          415|

       … while calling 'foldr'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:52:20:

           51|   */
           52|   foldr = op: nul: list:
             |                    ^
           53|     let

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:59:8:

           58|         else op (elemAt list n) (fold' (n + 1));
           59|     in fold' 0;
             |        ^
           60|

       … while calling 'fold''

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:55:15:

           54|       len = length list;
           55|       fold' = n:
             |               ^
           56|         if n == len

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/top-level.nix:48:16:

           47|   # makes it bootable. See `activatable-system.nix`.
           48|   baseSystem = pkgs.stdenvNoCC.mkDerivation ({
             |                ^
           49|     name = "nixos-system-${config.system.name}-${config.system.nixos.label}";

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/stdenv/generic/make-derivation.nix:600:3:

          599| in
          600|   fnOrAttrs:
             |   ^
          601|     if builtins.isFunction fnOrAttrs

       … while calling 'g'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:643:19:

          642|           g =
          643|             name: value:
             |                   ^
          644|             if isAttrs value && cond value

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:646:20:

          645|               then recurse (path ++ [name]) value
          646|               else f (path ++ [name]) value;
             |                    ^
          647|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `system.systemBuilderArgs':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:59:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                                                           ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … while calling 'merge'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:540:20:

          539|       check = isAttrs;
          540|       merge = loc: defs:
             |                    ^
          541|         mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:541:35:

          540|       merge = loc: defs:
          541|         mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
             |                                   ^
          542|             (mergeDefinitions (loc ++ [name]) elemType defs).optionalValue

       … while calling 'filterAttrs'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:323:5:

          322|     # The attribute set to filter
          323|     set:
             |     ^
          324|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:324:29:

          323|     set:
          324|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
             |                             ^
          325|

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:324:62:

          323|     set:
          324|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
             |                                                              ^
          325|

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:541:51:

          540|       merge = loc: defs:
          541|         mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
             |                                                   ^
          542|             (mergeDefinitions (loc ++ [name]) elemType defs).optionalValue

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:541:86:

          540|       merge = loc: defs:
          541|         mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
             |                                                                                      ^
          542|             (mergeDefinitions (loc ++ [name]) elemType defs).optionalValue

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:822:28:

          821|         # Process mkMerge and mkIf properties.
          822|         defs' = concatMap (m:
             |                            ^
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating definitions from `/nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/activatable-system.nix':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:823:137:

          822|         defs' = concatMap (m:
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          824|         ) defs;

       … while calling 'dischargeProperties'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/activation-script.nix:133:18:

          132|       apply = set: set // {
          133|         script = systemActivationScript set false;
             |                  ^
          134|       };

       … while calling 'systemActivationScript'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/activation-script.nix:20:33:

           19|
           20|   systemActivationScript = set: onlyDry: let
             |                                 ^
           21|     set' = mapAttrs (_: v: if isString v then (noDepEntry v) // { supportsDryActivation = false; } else v) set;

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/activation/activation-script.nix:49:9:

           48|
           49|       ${textClosureMap id (withDrySnippets) (attrNames withDrySnippets)}
             |         ^
           50|

       … while calling 'textClosureMap'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/strings-with-deps.nix:75:35:

           74|
           75|   textClosureMap = f: predefined: names:
             |                                   ^
           76|     concatStringsSep "\n" (map f (textClosureList predefined names));

       … while calling 'id'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/trivial.nix:14:5:

           13|     # The value to return
           14|     x: x;
             |     ^
           15|

       … while calling 'g'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:643:19:

          642|           g =
          643|             name: value:
             |                   ^
          644|             if isAttrs value && cond value

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:646:20:

          645|               then recurse (path ++ [name]) value
          646|               else f (path ++ [name]) value;
             |                    ^
          647|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `system.activationScripts.etc.text':

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:822:28:

          821|         # Process mkMerge and mkIf properties.
          822|         defs' = concatMap (m:
             |                            ^
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating definitions from `/nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/etc/etc-activation.nix':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:823:137:

          822|         defs' = concatMap (m:
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          824|         ) defs;

       … while calling 'dischargeProperties'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:860:24:

          859|     let f = attrPath:
          860|       zipAttrsWith (n: values:
             |                        ^
          861|         let here = attrPath ++ [n]; in

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:565:29:

          564|       merge = loc: defs:
          565|         zipAttrsWith (name: defs:
             |                             ^
          566|           let merged = mergeDefinitions (loc ++ [name]) elemType defs;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:822:28:

          821|         # Process mkMerge and mkIf properties.
          822|         defs' = concatMap (m:
             |                            ^
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating definitions from `/nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/etc/etc.nix':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:823:137:

          822|         defs' = concatMap (m:
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          824|         ) defs;

       … while calling 'dischargeProperties'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:102:39:

          101|         then value
          102|         else { ${elemAt attrPath n} = atDepth (n + 1); };
             |                                       ^
          103|     in atDepth 0;

       … while calling 'atDepth'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:99:17:

           98|       len = length attrPath;
           99|       atDepth = n:
             |                 ^
          100|         if n == len

       … while evaluating derivation 'etc'
         whose name attribute is located at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildCommand' of derivation 'etc'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/build-support/trivial-builders/default.nix:87:14:

           86|       enableParallelBuilding = true;
           87|       inherit buildCommand name;
             |              ^
           88|       passAsFile = [ "buildCommand" ]

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/etc/etc.nix:54:7:

           53|     mkdir -p "$out/etc"
           54|     ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
             |       ^
           55|       "makeEtcEntry"

       … while calling 'concatMapStringsSep'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/strings.nix:117:5:

          116|     # List of input strings
          117|     list: concatStringsSep sep (map f list);
             |     ^
          118|

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/etc/etc.nix:54:33:

           53|     mkdir -p "$out/etc"
           54|     ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
             |                                 ^
           55|       "makeEtcEntry"

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/nixos/modules/system/etc/etc.nix:54:43:

           53|     mkdir -p "$out/etc"
           54|     ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
             |                                           ^
           55|       "makeEtcEntry"

       … while calling 'concatMapStringsSep'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/strings.nix:117:5:

          116|     # List of input strings
          117|     list: concatStringsSep sep (map f list);
             |     ^
          118|

       … while calling 'escapeShellArg'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/strings.nix:443:20:

          442|   */
          443|   escapeShellArg = arg: "'${replaceStrings ["'"] ["'\\''"] (toString arg)}'";
             |                    ^
          444|

       … while calling 'g'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:643:19:

          642|           g =
          643|             name: value:
             |                   ^
          644|             if isAttrs value && cond value

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:646:20:

          645|               then recurse (path ++ [name]) value
          646|               else f (path ++ [name]) value;
             |                    ^
          647|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `environment.etc.dbus-1.source':

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:17:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                 ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:22:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                      ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … while calling 'check'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:493:15:

          492|       descriptionClass = "noun";
          493|       check = x: isStringLike x && builtins.substring 0 1 (toString x) == "/";
             |               ^
          494|       merge = mergeEqualOption;

       … while evaluating derivation 'dbus-1'
         whose name attribute is located at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'serviceDirectories' of derivation 'dbus-1'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/development/libraries/dbus/make-dbus-conf.nix:18:12:

           17|   {
           18|     inherit serviceDirectories suidHelper apparmor;
             |            ^
           19|     preferLocalBuild = true;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:511:14:

          510|       merge = loc: defs:
          511|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
             |              ^
          512|           imap1 (m: def':

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:17:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                 ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:22:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                      ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … while calling 'check'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:493:15:

          492|       descriptionClass = "noun";
          493|       check = x: isStringLike x && builtins.substring 0 1 (toString x) == "/";
             |               ^
          494|       merge = mergeEqualOption;

       … while evaluating derivation 'system-path'
         whose name attribute is located at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'passAsFile' of derivation 'system-path'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/pkgs/build-support/trivial-builders/default.nix:88:7:

           87|       inherit buildCommand name;
           88|       passAsFile = [ "buildCommand" ]
             |       ^
           89|         ++ (derivationArgs.passAsFile or []);

       … while calling 'g'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:643:19:

          642|           g =
          643|             name: value:
             |                   ^
          644|             if isAttrs value && cond value

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/attrsets.nix:646:20:

          645|               then recurse (path ++ [name]) value
          646|               else f (path ++ [name]) value;
             |                    ^
          647|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `environment.systemPackages':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:844:59:

          843|       if isDefined then
          844|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                                                           ^
          845|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … while calling 'merge'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:510:20:

          509|       check = isList;
          510|       merge = loc: defs:
             |                    ^
          511|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:511:35:

          510|       merge = loc: defs:
          511|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
             |                                   ^
          512|           imap1 (m: def':

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:164:29:

          163|   */
          164|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                             ^
          165|

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/lists.nix:164:32:

          163|   */
          164|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                                ^
          165|

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/types.nix:512:21:

          511|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
          512|           imap1 (m: def':
             |                     ^
          513|             (mergeDefinitions

       … while calling anonymous lambda

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:822:28:

          821|         # Process mkMerge and mkIf properties.
          822|         defs' = concatMap (m:
             |                            ^
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating definitions from `/nix/store/b90bkyadj18n26a500mwkqkmq9gz8xsr-source/utils.nix':

       … from call site

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:823:137:

          822|         defs' = concatMap (m:
          823|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          824|         ) defs;

       … while calling 'dischargeProperties'

         at /nix/store/aiv01710wqn2b7hms2253d1cq89kdzh8-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       error: undefined variable 'surrealist'

       at /nix/store/b90bkyadj18n26a500mwkqkmq9gz8xsr-source/utils.nix:11:5:

           10|     surrealdb-migrations
           11|     surrealist
             |     ^
           12|   ];

[adamjohannes]

Hi @XNM1 , any ideas on how to fix this issue?

[ReveekJ]

@XNM1 any ideas? i have same error

[XNM1]

Hi, sorry for the delay in responding. I have some suggestions regarding the errors you're encountering:

1. Error ('undefined variable'): It appears you're trying to rebuild your system using Nixpkgs version 23.11. This version does not include the four packages causing the errors. Here are some possible solutions:

   • Change your Nixpkgs channel: Update your system's channel to either nixos-24.05 (stable) or nixos-unstable (latest). You can do this using the command:

     nix-channel --add https://nixos.org/channels/nixos-24.05 nixos 
     # Or
     nix-channel --add https://nixos.org/channels/nixos-unstable nixos
     

     (I personally set my channel in the ~/.nix-channels file, and it usually works well. However, something might have changed in newer versions, or you might need to double-check if the necessary file was copied from my config to your home directory before rebuilding.)

   • Comment out undefined packages: Temporarily comment out the lines in your configuration referencing the undefined packages. Rebuild your system, then uncomment the lines and rebuild again. This might help resolve dependency issues.

2. Error ('File system "/boot" is not a FAT EFI System Partition (ESP) file system'): This error could suggests a mismatch between the boot directory you specified during installation and the default NixOS boot directory (/boot). Additionally, it could be an issue with the boot partition format. Here's what you can try:

   • Manually set the boot directory: In nixos/bootloader.nix file, add the following line:

     boot.loader.efi.efiSysMountPoint = "/boot/efi";
     

     (In your case I think it is /boot/efi, but if it's different, replace /boot/efi with your actual boot directory.)

   • Reinstall with the correct boot partition: If the above doesn't work, consider reinstalling your system, ensuring you correctly set up an EFI System Partition (ESP) during installation.

[dmitriiweb]

I solved the problem with hyprcursor, hyprlock and hypridle packages with run sudo nix flake update before running nixos-rebuild

[XNM1]

I found a solution for the problem of missing the latest packages when applying the configuration. From now on, I suggest using the following command instead of sudo nixos-rebuild switch --flake /etc/nixos#your-hostname:

sudo nixos-rebuild switch --flake /etc/nixos#your-hostname --update-input nixpkgs --update-input rust-overlay --commit-lock-file --upgrade

This command updates channels in the flake to the latest and applies the settings.

I've already updated the README with these changes.