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getDerivations: add attributes to trace

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This improves the error message of nix-env -qa, among others, which
is crucial for understanding some ofborg eval error reports, such as
https://gist.github.com/GrahamcOfBorg/89101ca9c2c855d288178f1d3c78efef

After this change, it will report the same trace, but also start with

```
error:
       … while evaluating the attribute 'devShellTools'

       … while evaluating the attribute 'nixos'

       … while evaluating the attribute 'docker-tools-nix-shell'

       … while evaluating the attribute 'aarch64-darwin'

       … from call site
         at /home/user/h/nixpkgs/outpaths.nix:48:6:
           47|   tweak = lib.mapAttrs
           48|     (name: val:
             |      ^
           49|       if name == "recurseForDerivations" then true

<same>
```
This commit is contained in:
Robert Hensing 2024-07-05 15:28:41 +02:00
parent 509be0e77a
commit 09763c7cad
1 changed files with 19 additions and 14 deletions
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5
src/libexpr/get-drvs.cc
View file

@ -374,6 +374,7 @@ static void getDerivations(EvalState & state, Value & vIn,
bound to the attribute with the "lower" name should take
precedence). */
for (auto & i : v.attrs()->lexicographicOrder(state.symbols)) {
try {
debug("evaluating attribute '%1%'", state.symbols[i->name]);
if (!std::regex_match(std::string(state.symbols[i->name]), attrRegex))
continue;
@ -390,6 +391,10 @@ static void getDerivations(EvalState & state, Value & vIn,
getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
}
}
} catch (Error & e) {
e.addTrace(state.positions[i->pos], "while evaluating the attribute '%s'", state.symbols[i->name]);
throw;
}
}
}