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nix flake check: Check overlays

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Eelco Dolstra 2019-09-10 14:52:22 +02:00
parent f97d3753a1
commit dc3f52a144
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1 changed files with 19 additions and 0 deletions
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19
src/nix/flake.cc
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@ -280,6 +280,22 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
}
};
auto checkOverlay = [&](const std::string & attrPath, Value & v) {
try {
state->forceValue(v);
if (v.type != tLambda || v.lambda.fun->matchAttrs || std::string(v.lambda.fun->arg) != "final")
throw Error("overlay does not take an argument named 'final'");
auto body = dynamic_cast<ExprLambda *>(v.lambda.fun->body);
if (!body || body->matchAttrs || std::string(body->arg) != "prev")
throw Error("overlay does not take an argument named 'prev'");
// FIXME: if we have a 'nixpkgs' input, use it to
// evaluate the overlay.
} catch (Error & e) {
e.addPrefix(fmt("while checking the overlay '" ANSI_BOLD "%s" ANSI_NORMAL "':\n", attrPath));
throw;
}
};
{
Activity act(*logger, lvlInfo, actUnknown, "evaluating flake");
@ -326,6 +342,9 @@ struct CmdFlakeCheck : FlakeCommand, MixJSON
// FIXME: do getDerivations?
;
else if (name == "overlay")
checkOverlay(name, vProvide);
else
warn("unknown flake output '%s'", name);