forked from lix-project/lix
Make InstallableFlake::toValue() and toDerivation() behave consistently
In particular, this means that 'nix eval` (which uses toValue()) no longer auto-calls functions or functors (because AttrCursor::findAlongAttrPath() doesn't). Fixes #6152. Also use ref<> in a few places, and don't return attrpaths from getCursor() because cursors already have a getAttrPath() method.
This commit is contained in:
parent
0e58affd39
commit
d89840b103
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@ -334,16 +334,16 @@ DerivedPath Installable::toDerivedPath()
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return std::move(buildables[0]);
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}
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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std::vector<ref<eval_cache::AttrCursor>>
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Installable::getCursors(EvalState & state)
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{
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auto evalCache =
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std::make_shared<nix::eval_cache::EvalCache>(std::nullopt, state,
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[&]() { return toValue(state).first; });
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return {{evalCache->getRoot(), ""}};
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return {evalCache->getRoot()};
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}
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std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>
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ref<eval_cache::AttrCursor>
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Installable::getCursor(EvalState & state)
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{
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auto cursors = getCursors(state);
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@ -566,43 +566,21 @@ InstallableFlake::InstallableFlake(
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std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation()
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{
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auto lockedFlake = getLockedFlake();
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auto attr = getCursor(*state);
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auto cache = openEvalCache(*state, lockedFlake);
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auto root = cache->getRoot();
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auto attrPath = attr->getAttrPathStr();
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Suggestions suggestions;
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if (!attr->isDerivation())
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throw Error("flake output attribute '%s' is not a derivation", attrPath);
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for (auto & attrPath : getActualAttrPaths()) {
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debug("trying flake output attribute '%s'", attrPath);
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auto drvPath = attr->forceDerivation();
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auto attrOrSuggestions = root->findAlongAttrPath(
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parseAttrPath(*state, attrPath),
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true
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);
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auto drvInfo = DerivationInfo {
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std::move(drvPath),
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attr->getAttr(state->sOutputName)->getString()
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};
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if (!attrOrSuggestions) {
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suggestions += attrOrSuggestions.getSuggestions();
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continue;
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}
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auto attr = *attrOrSuggestions;
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if (!attr->isDerivation())
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throw Error("flake output attribute '%s' is not a derivation", attrPath);
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auto drvPath = attr->forceDerivation();
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auto drvInfo = DerivationInfo {
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std::move(drvPath),
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attr->getAttr(state->sOutputName)->getString()
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};
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return {attrPath, lockedFlake->flake.lockedRef, std::move(drvInfo)};
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}
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throw Error(suggestions, "flake '%s' does not provide attribute %s",
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flakeRef, showAttrPaths(getActualAttrPaths()));
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return {attrPath, getLockedFlake()->flake.lockedRef, std::move(drvInfo)};
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}
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std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
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@ -614,33 +592,10 @@ std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
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std::pair<Value *, Pos> InstallableFlake::toValue(EvalState & state)
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{
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auto lockedFlake = getLockedFlake();
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auto vOutputs = getFlakeOutputs(state, *lockedFlake);
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auto emptyArgs = state.allocBindings(0);
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Suggestions suggestions;
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for (auto & attrPath : getActualAttrPaths()) {
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try {
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auto [v, pos] = findAlongAttrPath(state, attrPath, *emptyArgs, *vOutputs);
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state.forceValue(*v, pos);
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return {v, pos};
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} catch (AttrPathNotFound & e) {
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suggestions += e.info().suggestions;
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}
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}
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throw Error(
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suggestions,
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"flake '%s' does not provide attribute %s",
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flakeRef,
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showAttrPaths(getActualAttrPaths())
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);
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return {&getCursor(state)->forceValue(), noPos};
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}
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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std::vector<ref<eval_cache::AttrCursor>>
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InstallableFlake::getCursors(EvalState & state)
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{
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auto evalCache = openEvalCache(state,
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@ -648,21 +603,55 @@ InstallableFlake::getCursors(EvalState & state)
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auto root = evalCache->getRoot();
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>> res;
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std::vector<ref<eval_cache::AttrCursor>> res;
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for (auto & attrPath : getActualAttrPaths()) {
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auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
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if (attr) res.push_back({*attr, attrPath});
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if (attr) res.push_back(ref(*attr));
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}
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return res;
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}
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ref<eval_cache::AttrCursor> InstallableFlake::getCursor(EvalState & state)
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{
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auto lockedFlake = getLockedFlake();
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auto cache = openEvalCache(state, lockedFlake);
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auto root = cache->getRoot();
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Suggestions suggestions;
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auto attrPaths = getActualAttrPaths();
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for (auto & attrPath : attrPaths) {
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debug("trying flake output attribute '%s'", attrPath);
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auto attrOrSuggestions = root->findAlongAttrPath(
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parseAttrPath(state, attrPath),
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true
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);
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if (!attrOrSuggestions) {
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suggestions += attrOrSuggestions.getSuggestions();
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continue;
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}
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return *attrOrSuggestions;
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}
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throw Error(
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suggestions,
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"flake '%s' does not provide attribute %s",
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flakeRef,
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showAttrPaths(attrPaths));
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}
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std::shared_ptr<flake::LockedFlake> InstallableFlake::getLockedFlake() const
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{
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flake::LockFlags lockFlagsApplyConfig = lockFlags;
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lockFlagsApplyConfig.applyNixConfig = true;
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if (!_lockedFlake) {
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flake::LockFlags lockFlagsApplyConfig = lockFlags;
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lockFlagsApplyConfig.applyNixConfig = true;
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_lockedFlake = std::make_shared<flake::LockedFlake>(lockFlake(*state, flakeRef, lockFlagsApplyConfig));
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}
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return _lockedFlake;
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@ -80,10 +80,10 @@ struct Installable
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return {};
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}
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virtual std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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virtual std::vector<ref<eval_cache::AttrCursor>>
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getCursors(EvalState & state);
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std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>
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virtual ref<eval_cache::AttrCursor>
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getCursor(EvalState & state);
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virtual FlakeRef nixpkgsFlakeRef() const
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@ -180,9 +180,15 @@ struct InstallableFlake : InstallableValue
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std::pair<Value *, Pos> toValue(EvalState & state) override;
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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/* Get a cursor to every attrpath in getActualAttrPaths() that
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exists. */
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std::vector<ref<eval_cache::AttrCursor>>
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getCursors(EvalState & state) override;
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/* Get a cursor to the first attrpath in getActualAttrPaths() that
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exists, or throw an exception with suggestions if none exists. */
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ref<eval_cache::AttrCursor> getCursor(EvalState & state) override;
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std::shared_ptr<flake::LockedFlake> getLockedFlake() const;
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FlakeRef nixpkgsFlakeRef() const override;
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@ -306,9 +306,9 @@ Value * EvalCache::getRootValue()
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return *value;
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}
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std::shared_ptr<AttrCursor> EvalCache::getRoot()
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ref<AttrCursor> EvalCache::getRoot()
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{
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return std::make_shared<AttrCursor>(ref(shared_from_this()), std::nullopt);
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return make_ref<AttrCursor>(ref(shared_from_this()), std::nullopt);
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}
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AttrCursor::AttrCursor(
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@ -33,7 +33,7 @@ public:
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EvalState & state,
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RootLoader rootLoader);
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std::shared_ptr<AttrCursor> getRoot();
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ref<AttrCursor> getRoot();
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};
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enum AttrType {
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@ -104,6 +104,8 @@ public:
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ref<AttrCursor> getAttr(std::string_view name);
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/* Get an attribute along a chain of attrsets. Note that this does
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not auto-call functors or functions. */
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OrSuggestions<ref<AttrCursor>> findAlongAttrPath(const std::vector<Symbol> & attrPath, bool force = false);
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std::string getString();
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@ -61,7 +61,7 @@ std::string resolveString(Store & store, const std::string & toResolve, const Bu
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UnresolvedApp Installable::toApp(EvalState & state)
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{
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auto [cursor, attrPath] = getCursor(state);
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auto cursor = getCursor(state);
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auto type = cursor->getAttr("type")->getString();
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@ -101,7 +101,7 @@ UnresolvedApp Installable::toApp(EvalState & state)
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}
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else
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throw Error("attribute '%s' has unsupported type '%s'", attrPath, type);
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throw Error("attribute '%s' has unsupported type '%s'", cursor->getAttrPathStr(), type);
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}
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// FIXME: move to libcmd
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@ -705,7 +705,7 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
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defaultTemplateAttrPathsPrefixes,
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lockFlags);
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auto [cursor, attrPath] = installable.getCursor(*evalState);
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auto cursor = installable.getCursor(*evalState);
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auto templateDirAttr = cursor->getAttr("path");
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auto templateDir = templateDirAttr->getString();
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@ -165,8 +165,8 @@ struct CmdSearch : InstallableCommand, MixJSON
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}
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};
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for (auto & [cursor, prefix] : installable->getCursors(*state))
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visit(*cursor, parseAttrPath(*state, prefix), true);
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for (auto & cursor : installable->getCursors(*state))
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visit(*cursor, cursor->getAttrPath(), true);
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if (!json && !results)
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throw Error("no results for the given search term(s)!");
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