On CI we have a problem with nix errors not showing and it got solved with a custom fix to the C++.
The problem now is that flake-compat isn’t accepting the new version of nix and I believe it is because our custom nix is “dirty” for some reason I can’t understand.
Here is a small project reproducing my error: GitHub - hhefesto/dirty-nix-question: `error: in pure evaluation mode, 'fetchTarball' requires a 'sha256' argument` gets triggered when having a custom nix
And you can reproduce locally with:
$ nix build github:hhefesto/dirty-nix-question --show-trace
warning: Using saved setting for 'allow-import-from-derivation = true' from ~/.local/share/nix/trusted-settings.json.
warning: Using saved setting for 'extra-substituters = https://cache.iog.io' from ~/.local/share/nix/trusted-settings.json.
warning: Using saved setting for 'extra-trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=' from ~/.local/share/nix/trusted-settings.json.
trace: WARNING: `cleanSourceWith` called on /nix/store/ljcfgkxva04qy43n8ynl5ydj6hy3151y-source without a `name`. Consider adding `name = "ljcfgkxva04qy43n8ynl5ydj6hy3151y-source";`
error: in pure evaluation mode, 'fetchTarball' requires a 'sha256' argument
… while realising the context of a path
at /nix/store/nvrfhgwqs57vj2gsmw9rgvlf6pjg8l9v-source/default.nix:1:2:
1| (import (fetchTarball "https://github.com/edolstra/flake-compat/archive/master.tar.gz") {
| ^
2| src = ./.;
… while evaluating the file '/nix/store/nvrfhgwqs57vj2gsmw9rgvlf6pjg8l9v-source/default.nix':
… while evaluating the attribute 'buildPackages.nix'
at /nix/store/ljcfgkxva04qy43n8ynl5ydj6hy3151y-source/flake.nix:26:11:
25| (final: prev: {
26| nix = nix-patched.packages.x86_64-linux.default;
| ^
27| })
… while calling 'getOutput'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/attrsets.nix:832:23:
831| */
832| getOutput = output: pkg:
| ^
833| if ! pkg ? outputSpecified || ! pkg.outputSpecified
… from call site
… while calling anonymous lambda
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/strings.nix:160:68:
159| paths:
160| concatStringsSep ":" (map (path: path + "/" + subDir) (filter (x: x != null) paths));
| ^
161|
… from call site
… while calling 'makeSearchPath'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/strings.nix:159:5:
158| # List of base paths
159| paths:
| ^
160| concatStringsSep ":" (map (path: path + "/" + subDir) (filter (x: x != null) paths));
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/strings.nix:179:11:
178| # List of packages
179| pkgs: makeSearchPath subDir (map (lib.getOutput output) pkgs);
| ^
180|
… while calling 'makeSearchPathOutput'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/strings.nix:179:5:
178| # List of packages
179| pkgs: makeSearchPath subDir (map (lib.getOutput output) pkgs);
| ^
180|
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/overlays/bootstrap.nix:1098:61:
1097| for prog in stack-to-nix cabal-to-nix plan-to-nix; do
1098| wrapProgram "$out/bin/$prog" --prefix PATH : "${final.lib.makeBinPath tools}"
| ^
1099| done
… while evaluating the attribute 'buildCommand' of the derivation 'nix-tools'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/pkgs/stdenv/generic/make-derivation.nix:294:7:
293| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
294| name =
| ^
295| let
… while evaluating the attribute 'buildInputs' of the derivation 'stack-repos'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/pkgs/stdenv/generic/make-derivation.nix:294:7:
293| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
294| name =
| ^
295| let
… while realising the context of a path
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/stack-cache-generator.nix:56:32:
55|
56| repos = builtins.fromJSON (builtins.readFile (evalPackages.runCommand "stack-repos" {
| ^
57| buildInputs = [ nix-tools ];
… while calling anonymous lambda
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/stack-cache-generator.nix:3:1:
2|
3| { src
| ^
4| , stackYaml ? "stack.yaml"
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/overlays/haskell.nix:926:34:
925| // final.lib.optionalAttrs (args.cache == null) { inherit cache; });
926| generatedCache = genStackCache args;
| ^
927| cache = if args.cache != null then args.cache else generatedCache;
… while calling 'optionalString'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/strings.nix:227:5:
226| # String to return if condition is true
227| string: if cond then string else "";
| ^
228|
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/call-stack-to-nix.nix:80:7:
79| ''}
80| ${evalPackages.lib.optionalString (cache != null) ''
| ^
81| cp ${mkCacheFile cache}/.stack-to-nix.cache* $out${subDir'}
… while evaluating the attribute 'buildCommand' of the derivation 'haskell-project-stack-to-nix-pkgs'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/pkgs/stdenv/generic/make-derivation.nix:294:7:
293| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
294| name =
| ^
295| let
… while realising the context of a path
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/import-and-filter-project.nix:18:13:
17| projectSubDir'' = if projectSubDir == "" then "" else projectSubDir + "/"; # With trailing /
18| project = import "${projectNix}${projectSubDir'}";
| ^
19| in project // {
… while calling anonymous lambda
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/import-and-filter-project.nix:5:1:
4| { pkgs, haskellLib }:
5| { projectNix, sourceRepos, src }:
| ^
6| let
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/overlays/haskell.nix:933:32:
932| pkg-set = mkStackPkgSet
933| { stack-pkgs = importAndFilterProject callProjectResults;
| ^
934| pkg-def-extras = (args.pkg-def-extras or []);
… while calling 'imap1'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/lists.nix:117:14:
116| */
117| imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
| ^
118|
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:398:73:
397| };
398| in parentFile: parentKey: initialModules: args: collectResults (imap1 (n: x:
| ^
399| let
… while calling 'filterModules'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:413:36:
412| # modules recursively. It returns the final list of unique-by-key modules
413| filterModules = modulesPath: { disabled, modules }:
| ^
414| let
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:426:7:
425| in modulesPath: initialModules: args:
426| filterModules modulesPath (collectStructuredModules unknownModule "" initialModules args);
| ^
427|
… while calling anonymous lambda
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:425:37:
424|
425| in modulesPath: initialModules: args:
| ^
426| filterModules modulesPath (collectStructuredModules unknownModule "" initialModules args);
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:258:25:
257| merged =
258| let collected = collectModules
| ^
259| (specialArgs.modulesPath or "")
… while calling 'reverseList'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/lists.nix:406:17:
405| */
406| reverseList = xs:
| ^
407| let l = length xs; in genList (n: elemAt xs (l - n - 1)) l;
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:262:33:
261| ({ inherit lib options config specialArgs; } // specialArgs);
262| in mergeModules prefix (reverseList collected);
| ^
263|
… while calling 'byName'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:542:25:
541| */
542| byName = attr: f: modules:
| ^
543| zipAttrsWith (n: concatLists)
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:559:21:
558| # an attrset 'name' => list of submodules that declare ‘name’.
559| declsByName = byName "options" (module: option:
| ^
560| [{ inherit (module) _file; options = option; }]
… while evaluating the attribute 'matchedOptions'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:637:14:
636| in {
637| inherit matchedOptions;
| ^
638|
… while calling 'mapAttrsRecursiveCond'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/attrsets.nix:530:5:
529| # Attribute set to recursively map over.
530| set:
| ^
531| let
… from call site
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:270:28:
269| # For definitions that have an associated option
270| declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
| ^
271|
… while evaluating the attribute 'config'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/modules.nix:346:9:
345| options = checked options;
346| config = checked (removeAttrs config [ "_module" ]);
| ^
347| _module = checked (config._module);
… while evaluating the attribute 'hsPkgs'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/overlays/haskell.nix:945:43:
944| project = addProjectAndPackageAttrs {
945| inherit (pkg-set.config) hsPkgs;
| ^
946| inherit pkg-set;
… while evaluating the attribute 'hsPkgs'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/overlays/haskell.nix:716:15:
715| # Haskell packages
716| hsPkgs = final.lib.mapAttrs (packageName: package':
| ^
717| if package' == null
… while calling 'filterAttrs'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/attrsets.nix:305:5:
304| # The attribute set to filter
305| set:
| ^
306| listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:105:31:
104| isProjectPackage = p: p.isProject or false;
105| selectProjectPackages = ps: lib.filterAttrs (n: p: p != null && isLocalPackage p && isProjectPackage p) ps;
| ^
106|
… while calling 'selectProjectPackages'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:105:27:
104| isProjectPackage = p: p.isProject or false;
105| selectProjectPackages = ps: lib.filterAttrs (n: p: p != null && isLocalPackage p && isProjectPackage p) ps;
| ^
106|
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:506:29:
505| selectPackages ? haskellLib.selectProjectPackages
506| , haskellPackages ? selectPackages project.hsPkgs
| ^
507| , packages ? mkFlakePackages haskellPackages
… while calling 'mapAttrsToList'
at /nix/store/5yr805gxxxaq4xfdrwgnf19ws59sm7n5-source/lib/attrsets.nix:478:5:
477| # Attribute set to map over.
478| attrs:
| ^
479| map (name: f name attrs.${name}) (attrNames attrs);
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:429:22:
428| mkFlakePackages = haskellPackages: builtins.listToAttrs (
429| lib.concatLists (lib.mapAttrsToList (packageName: package:
| ^
430| lib.optional (package.components ? library)
… while calling 'mkFlakePackages'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:428:21:
427| # Flake package names that are flat and match the cabal component names.
428| mkFlakePackages = haskellPackages: builtins.listToAttrs (
| ^
429| lib.concatLists (lib.mapAttrsToList (packageName: package:
… from call site
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:507:22:
506| , haskellPackages ? selectPackages project.hsPkgs
507| , packages ? mkFlakePackages haskellPackages
| ^
508| , apps ? mkFlakeApps haskellPackages
… while evaluating the attribute 'packages'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:517:14:
516| }: {
517| inherit
| ^
518| # Used by:
… while evaluating the attribute 'packages'
at /nix/store/apmxc977sc6ikq8r032385f41rrsiqq6-source/lib/default.nix:382:7:
381| inherit name;
382| value =
| ^
383| # This favours the first item (`a`) in the case of duplicates
Any help is greatly appreciated and thank you very much for your time < 3
, but you don’t have to: The README in the flake-compat repo shows an expression which reads the sha256 from the flake.lock file: