Output path comparison

nix-env failed:
error:
       … while evaluating call site

       at «none»:0: (source not available)

       … while calling anonymous lambda

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/.gc-of-borg-outpaths.nix:48:12:

           47|   tweak = lib.mapAttrs
           48|     (name: val:
             |            ^
           49|       if name == "recurseForDerivations" then true

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/attrsets.nix:1214:43:

         1213|     f:
         1214|     listToAttrs (map (n: nameValuePair n (f n)) names);
             |                                           ^
         1215|

       … while calling anonymous lambda

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/top-level/release-lib.nix:145:6:

          144|   testOnCross = crossSystem: metaPatterns: f: forMatchingSystems metaPatterns
          145|     (system: hydraJob' (f (pkgsForCross crossSystem system)));
             |      ^
          146|

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/top-level/release-lib.nix:145:14:

          144|   testOnCross = crossSystem: metaPatterns: f: forMatchingSystems metaPatterns
          145|     (system: hydraJob' (f (pkgsForCross crossSystem system)));
             |              ^
          146|

       … while calling 'hydraJob'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/customisation.nix:388:14:

          387|   */
          388|   hydraJob = drv:
             |              ^
          389|     let

       … while evaluating the attribute 'outPath'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/customisation.nix:404:13:

          403|           value = commonAttrs // {
          404|             outPath = output.outPath;
             |             ^
          405|             drvPath = output.drvPath;

       … while evaluating the attribute 'outPath'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/customisation.nix:352:13:

          351|             drvPath = assert condition; drv.${outputName}.drvPath;
          352|             outPath = assert condition; drv.${outputName}.outPath;
             |             ^
          353|           } //

       … while evaluating the attribute 'out.outPath'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/customisation.nix:352:13:

          351|             drvPath = assert condition; drv.${outputName}.drvPath;
          352|             outPath = assert condition; drv.${outputName}.outPath;
             |             ^
          353|           } //

       … while evaluating the attribute 'propagatedBuildInputs' of the derivation 'photini-2024.2.1'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/stdenv/generic/make-derivation.nix:331:7:

          330|     // (optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
          331|       name =
             |       ^
          332|         let

       … while evaluating call site

       at «none»:0: (source not available)

       … while calling anonymous lambda

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/stdenv/generic/make-derivation.nix:321:13:

          320|       (map (drv: getDev drv.__spliced.hostHost or drv) (checkDependencyList "depsHostHostPropagated" depsHostHostPropagated))
          321|       (map (drv: getDev drv.__spliced.hostTarget or drv) (checkDependencyList "propagatedBuildInputs" propagatedBuildInputs))
             |             ^
          322|     ]

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/stdenv/generic/make-derivation.nix:321:18:

          320|       (map (drv: getDev drv.__spliced.hostHost or drv) (checkDependencyList "depsHostHostPropagated" depsHostHostPropagated))
          321|       (map (drv: getDev drv.__spliced.hostTarget or drv) (checkDependencyList "propagatedBuildInputs" propagatedBuildInputs))
             |                  ^
          322|     ]

       … while calling 'getOutput'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/attrsets.nix:1762:23:

         1761|   */
         1762|   getOutput = output: pkg:
             |                       ^
         1763|     if ! pkg ? outputSpecified || ! pkg.outputSpecified

       … while evaluating call site

       at «none»:0: (source not available)

       … while calling anonymous lambda

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/lists.nix:334:29:

          333|   */
          334|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                             ^
          335|

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/lists.nix:334:32:

          333|   */
          334|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                                ^
          335|

       … while calling anonymous lambda

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/stdenv/generic/make-derivation.nix:276:15:

          275|     imap1
          276|       (index: dep:
             |               ^
          277|         if isDerivation dep || dep == null || builtins.isString dep || builtins.isPath dep then dep

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/stdenv/generic/make-derivation.nix:277:12:

          276|       (index: dep:
          277|         if isDerivation dep || dep == null || builtins.isString dep || builtins.isPath dep then dep
             |            ^
          278|         else if isList dep then checkDependencyList' ([index] ++ positions) name dep

       … while calling 'isDerivation'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/lib/attrsets.nix:1249:5:

         1248|   isDerivation =
         1249|     value: value.type or null == "derivation";
             |     ^
         1250|

       … while evaluating call site

       at «none»:0: (source not available)

       … while calling 'checkDrv'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/development/interpreters/python/mk-python-derivation.nix:206:26:

          205|
          206|     checkDrv = attrName: drv:
             |                          ^
          207|       if (isPythonModule drv) && (isMismatchedPython drv) then throwMismatch attrName drv

       … while evaluating call site

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/development/interpreters/python/mk-python-derivation.nix:207:11:

          206|     checkDrv = attrName: drv:
          207|       if (isPythonModule drv) && (isMismatchedPython drv) then throwMismatch attrName drv
             |           ^
          208|       else drv;

       … while calling 'isPythonModule'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/development/interpreters/python/mk-python-derivation.nix:42:20:

           41|
           42|   isPythonModule = drv:
             |                    ^
           43|     # all pythonModules have the pythonModule attribute

       error: undefined variable 'requests_toolbelt'

       at /ofborg/checkout/3/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-2/pkgs/by-name/ph/photini/package.nix:29:5:

           28|     requests-oauthlib
           29|     requests_toolbelt
             |     ^
           30|     pyenchant

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Looks like you’re running into a dependency resolution issue in Nix while building, where requests_toolbelt isn’t being recognized as a valid variable in your derivation. This usually happens when a package is missing from the defined inputs or isn’t properly declared in the Python environment.

From a practical perspective, I’ve seen similar errors where either requests-toolbelt needed to be added to the propagatedBuildInputs or the spelling had to match the upstream Python package name. A quick way to test is to run:

nix-shell -p python3Packages.requests-toolbelt

If that resolves correctly, then just ensure it’s included in your derivation under the right attribute.

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Would you like me to draft a step-by-step Nix expression fix for your case (adding requests_toolbelt properly), or are you mainly looking for a general troubleshooting direction?

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Looks like a nix-env build error — the missing dependency requests_toolbelt is causing the “undefined variable” issue. Try updating your nixpkgs or adding that dependency manually before rebuilding.
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This nix-env build failed because the package requests_toolbelt isn’t defined in the environment. Add it as a dependency or update your nixpkgs channel to fix the issue.

Feels a bit like the online generator running out of parts mid-build

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