forked from lix-project/lix
cleanup and slightly refactor DrvInfo::queryOutputs
Change-Id: I00d9ff707fe61995737b86af6d2eaa1e4d8116ff
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c347d3df8f
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@ -101,66 +101,134 @@ StorePath DrvInfo::queryOutPath()
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return *outPath;
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}
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void DrvInfo::fillOutputs(bool withPaths)
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{
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auto fillDefault = [&]() {
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std::optional<StorePath> outPath = std::nullopt;
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if (withPaths) {
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outPath.emplace(this->queryOutPath());
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}
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this->outputs.emplace("out", outPath);
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};
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// lol. lmao even.
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if (this->attrs == nullptr) {
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fillDefault();
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return;
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}
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Attr * outputs = this->attrs->get(this->state->sOutputs);
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if (outputs == nullptr) {
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fillDefault();
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return;
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}
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// NOTE(Qyriad): I don't think there is any codepath that can cause this to error.
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this->state->forceList(
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*outputs->value,
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outputs->pos,
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"while evaluating the 'outputs' attribute of a derivation"
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);
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for (auto [idx, elem] : enumerate(outputs->value->listItems())) {
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// NOTE(Qyriad): This error should be *extremely* rare in practice.
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// It is impossible to construct with `stdenv.mkDerivation`,
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// `builtins.derivation`, or even `derivationStrict`. As far as we can tell,
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// it is only possible by overriding a derivation attrset already created by
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// one of those with `//` to introduce the failing `outputs` entry.
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auto errMsg = fmt("while evaluating output %d of a derivation", idx);
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std::string_view outputName = state->forceStringNoCtx(
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*elem,
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outputs->pos,
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errMsg
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);
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if (withPaths) {
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// Find the attr with this output's name...
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Attr * out = this->attrs->get(this->state->symbols.create(outputName));
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if (out == nullptr) {
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// FIXME: throw error?
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continue;
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}
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// Meanwhile we couldn't figure out any circumstances
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// that cause this to error.
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state->forceAttrs(*out->value, outputs->pos, errMsg);
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// ...and evaluate its `outPath` attribute.
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Attr * outPath = out->value->attrs->get(this->state->sOutPath);
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if (outPath == nullptr) {
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continue;
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// FIXME: throw error?
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}
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NixStringContext context;
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// And idk what could possibly cause this one to error
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// that wouldn't error before here.
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auto storePath = state->coerceToStorePath(
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outPath->pos,
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*outPath->value,
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context,
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errMsg
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);
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this->outputs.emplace(outputName, storePath);
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} else {
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this->outputs.emplace(outputName, std::nullopt);
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}
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}
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}
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DrvInfo::Outputs DrvInfo::queryOutputs(bool withPaths, bool onlyOutputsToInstall)
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{
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// If we haven't already cached the outputs set, then do so now.
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if (outputs.empty()) {
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/* Get the ‘outputs’ list. */
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Bindings::iterator i;
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if (attrs && (i = attrs->find(state->sOutputs)) != attrs->end()) {
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state->forceList(*i->value, i->pos, "while evaluating the 'outputs' attribute of a derivation");
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/* For each output... */
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for (auto elem : i->value->listItems()) {
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std::string output(state->forceStringNoCtx(*elem, i->pos, "while evaluating the name of an output of a derivation"));
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if (withPaths) {
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/* Evaluate the corresponding set. */
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Bindings::iterator out = attrs->find(state->symbols.create(output));
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if (out == attrs->end()) continue; // FIXME: throw error?
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state->forceAttrs(*out->value, i->pos, "while evaluating an output of a derivation");
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/* And evaluate its ‘outPath’ attribute. */
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Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
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if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
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NixStringContext context;
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outputs.emplace(output, state->coerceToStorePath(outPath->pos, *outPath->value, context, "while evaluating an output path of a derivation"));
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} else
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outputs.emplace(output, std::nullopt);
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}
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} else
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outputs.emplace("out", withPaths ? std::optional{queryOutPath()} : std::nullopt);
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// FIXME: this behavior seems kind of busted, since whether or not this
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// DrvInfo will have paths is forever determined by the *first* call to
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// this function??
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fillOutputs(withPaths);
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}
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// Things that operate on derivations like packages, like `nix-env` and `nix build`,
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// allow derivations to specify which outputs should be used in those user-facing
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// cases if the user didn't specify an output explicitly.
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// If the caller just wanted all the outputs for this derivation, though,
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// then we're done here.
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if (!onlyOutputsToInstall || !attrs)
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return outputs;
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Bindings::iterator i;
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if (attrs && (i = attrs->find(state->sOutputSpecified)) != attrs->end() && state->forceBool(*i->value, i->pos, "while evaluating the 'outputSpecified' attribute of a derivation")) {
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Outputs result;
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auto out = outputs.find(queryOutputName());
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if (out == outputs.end())
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throw Error("derivation does not have output '%s'", queryOutputName());
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result.insert(*out);
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return result;
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// Regardless of `meta.outputsToInstall`, though, you can select into a derivation
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// output by its attribute, e.g. `pkgs.lix.dev`, which (lol?) sets the magic
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// attribute `outputSpecified = true`, and changes the `outputName` attr to the
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// explicitly selected-into output.
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if (Attr * outSpecAttr = attrs->get(state->sOutputSpecified)) {
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bool outputSpecified = this->state->forceBool(
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*outSpecAttr->value,
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outSpecAttr->pos,
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"while evaluating the 'outputSpecified' attribute of a derivation"
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);
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if (outputSpecified) {
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auto maybeOut = outputs.find(queryOutputName());
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if (maybeOut == outputs.end()) {
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throw Error("derivation does not have output '%s'", queryOutputName());
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}
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return Outputs{*maybeOut};
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}
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}
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else {
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/* Check for `meta.outputsToInstall` and return `outputs` reduced to that. */
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const Value * outTI = queryMeta("outputsToInstall");
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if (!outTI) return outputs;
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auto errMsg = Error("this derivation has bad 'meta.outputsToInstall'");
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/* ^ this shows during `nix-env -i` right under the bad derivation */
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if (!outTI->isList()) throw errMsg;
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Outputs result;
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for (auto elem : outTI->listItems()) {
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if (elem->type() != nString) throw errMsg;
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auto out = outputs.find(elem->string.s);
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if (out == outputs.end()) throw errMsg;
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result.insert(*out);
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}
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return result;
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/* Check for `meta.outputsToInstall` and return `outputs` reduced to that. */
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const Value * outTI = queryMeta("outputsToInstall");
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if (!outTI) return outputs;
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auto errMsg = Error("this derivation has bad 'meta.outputsToInstall'");
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/* ^ this shows during `nix-env -i` right under the bad derivation */
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if (!outTI->isList()) throw errMsg;
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Outputs result;
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for (auto elem : outTI->listItems()) {
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if (elem->type() != nString) throw errMsg;
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auto out = outputs.find(elem->string.s);
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if (out == outputs.end()) throw errMsg;
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result.insert(*out);
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}
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return result;
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}
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@ -37,6 +37,8 @@ private:
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bool checkMeta(Value & v);
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void fillOutputs(bool withPaths = true);
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public:
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/**
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* path towards the derivation
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