nix flake check: Check overlays
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@ -280,6 +280,22 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
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}
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};
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auto checkOverlay = [&](const std::string & attrPath, Value & v) {
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try {
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state->forceValue(v);
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if (v.type != tLambda || v.lambda.fun->matchAttrs || std::string(v.lambda.fun->arg) != "final")
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throw Error("overlay does not take an argument named 'final'");
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auto body = dynamic_cast<ExprLambda *>(v.lambda.fun->body);
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if (!body || body->matchAttrs || std::string(body->arg) != "prev")
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throw Error("overlay does not take an argument named 'prev'");
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// FIXME: if we have a 'nixpkgs' input, use it to
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// evaluate the overlay.
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} catch (Error & e) {
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e.addPrefix(fmt("while checking the overlay '" ANSI_BOLD "%s" ANSI_NORMAL "':\n", attrPath));
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throw;
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}
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};
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{
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Activity act(*logger, lvlInfo, actUnknown, "evaluating flake");
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@ -326,6 +342,9 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
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// FIXME: do getDerivations?
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;
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else if (name == "overlay")
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checkOverlay(name, vProvide);
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else
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warn("unknown flake output '%s'", name);
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