Using buildGoModule to define go pkg?

[lycheese]

I tried to adapt the example given in the pkgs readme but I am stumped how to proceed:

buildGoModule documentation

pkgs/development/tools/dockfmt/default.nix

{ lib, buildGoModule, srcs, ... }:

let src = srcs.dockfmt; in
buildGoModule rec {
  inherit src;
  inherit (src) pname version;

  vendorSha256 = "f6bc025739cf4f56287e879c75c11cc73ebafdf93a57c9bcd8805d1ab82434a0"; # Not sure which var to replace this with
}

pkgs/default.nix

final: prev: {
  dockfmt = prev.callPackage ./development/tools/dockfmt { };
}

pkgs/flake.nix

…
  inputs = {
    dockfmt.url = "github:jessfraz/dockfmt/v0.3.3/dockfmt-linux-amd64";
    dockfmt.flake = false;
  };
…

Output of flk $host switch --show-trace

building the system configuration...
error: attribute 'dockfmt' missing

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/pkgs/development/tools/dockfmt/default.nix:3:11:

            2|
            3| let src = srcs.dockfmt; in
             |           ^
            4| buildGoModule rec {

       … while evaluating the attribute 'version'

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/pkgs/development/tools/dockfmt/default.nix:6:16:

            5|   inherit src;
            6|   inherit (src) pname version;
             |                ^
            7|

       … while evaluating 'optionalAttrs'

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/lib/attrsets.nix:349:25:

          348|   */
          349|   optionalAttrs = cond: as: if cond then as else {};
             |                         ^
          350|

       … from call site

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/pkgs/stdenv/generic/make-derivation.nix:341:12:

          340|         # Fill `meta.position` to identify the source location of the package.
          341|         // lib.optionalAttrs (pos != null) {
             |            ^
          342|           position = pos.file + ":" + toString pos.line;

       … while evaluating 'filter'

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/lib/attrs.nix:39:20:

           38|       # Everything that nix flake check requires for the packages output
           39|       filter = (n: v: with v; let platforms = meta.hydraPlatforms or meta.platforms or [ ]; in
             |                    ^
           40|       lib.isDerivation v && !meta.broken && builtins.elem system platforms);

       … from call site

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/lib/attrsets.nix:125:62:

          124|   filterAttrs = pred: set:
          125|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
             |                                                              ^
          126|

       … while evaluating anonymous lambda

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/lib/attrsets.nix:125:29:

          124|   filterAttrs = pred: set:
          125|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
             |                             ^
          126|

       … from call site

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/lib/attrsets.nix:125:18:

          124|   filterAttrs = pred: set:
          125|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
             |                  ^
          126|

       … while evaluating 'filterAttrs'

       at /nix/store/fkjfrpn7yhjwaqrqfp8ifwgfiixc2lxg-source/lib/attrsets.nix:124:23:

          123|   */
          124|   filterAttrs = pred: set:
             |                       ^
          125|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));

       … from call site

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/lib/attrs.nix:42:5:

           41|     in
           42|     lib.filterAttrs filter packages;
             |     ^
           43|

       … while evaluating 'filterPackages'

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/lib/attrs.nix:36:28:

           35|   # Filter out packages that support given system and follow flake check requirements
           36|   filterPackages = system: packages:
             |                            ^
           37|     let

       … from call site

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/lib/mkFlake/default.nix:49:18:

           48|       inherit legacyPackages;
           49|       packages = dev.filterPackages system legacyPackages;
             |                  ^
           50|

       … while evaluating the attribute 'packages'

       at /nix/store/8sqwq9pi8hc1q18k4dsd1nsh9bnnphgi-source/lib/mkFlake/default.nix:49:7:

           48|       inherit legacyPackages;
           49|       packages = dev.filterPackages system legacyPackages;
             |       ^
           50|

Any help greatly appreciated

[nrdxp]

did you run nix lock --update-input pkgs after adding the inputs? Looks like it's not pulling the source down just yet, which would indicate you probably have not.

[lycheese]

That did it thank you.

Nix told me to set vendorSha256 to null so that problem is also gone.