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InstallableFlake: Handle missing attr in getCursors

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Handle the case where none of getActualAttrPaths() actually exists,
in which case instead of returning an empty vector.

This fixes the case where the user misspells the attribute name in nix
search. Instead of getting no search results, now it shows an error with
suggestions.

Also remove InstallableFlake::getCursor() override since it's now
equivalent to the base class version.
This commit is contained in:
dramforever 2023-01-23 23:06:57 +08:00
parent 90e630a542
commit b26562c629
2 changed files with 13 additions and 35 deletions
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44
src/libcmd/installables.cc
View file

@ -696,46 +696,28 @@ InstallableFlake::getCursors(EvalState & state)
std::vector<ref<eval_cache::AttrCursor>> res; std::vector<ref<eval_cache::AttrCursor>> res;
for (auto & attrPath : getActualAttrPaths()) {
auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
if (attr) res.push_back(ref(*attr));
}
return res;
}
ref<eval_cache::AttrCursor> InstallableFlake::getCursor(EvalState & state)
{
auto lockedFlake = getLockedFlake();
auto cache = openEvalCache(state, lockedFlake);
auto root = cache->getRoot();
Suggestions suggestions; Suggestions suggestions;
auto attrPaths = getActualAttrPaths(); auto attrPaths = getActualAttrPaths();
for (auto & attrPath : attrPaths) { for (auto & attrPath : attrPaths) {
debug("trying flake output attribute '%s'", attrPath); debug("trying flake output attribute '%s'", attrPath);
auto attrOrSuggestions = root->findAlongAttrPath( auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
parseAttrPath(state, attrPath), if (attr) {
true res.push_back(ref(*attr));
); } else {
suggestions += attr.getSuggestions();
if (!attrOrSuggestions) {
suggestions += attrOrSuggestions.getSuggestions();
continue;
} }
return *attrOrSuggestions;
} }
throw Error( if (res.size() == 0)
suggestions, throw Error(
"flake '%s' does not provide attribute %s", suggestions,
flakeRef, "flake '%s' does not provide attribute %s",
showAttrPaths(attrPaths)); flakeRef,
showAttrPaths(attrPaths));
return res;
} }
std::shared_ptr<flake::LockedFlake> InstallableFlake::getLockedFlake() const std::shared_ptr<flake::LockedFlake> InstallableFlake::getLockedFlake() const

4
src/libcmd/installables.hh
View file

@ -198,10 +198,6 @@ struct InstallableFlake : InstallableValue
std::vector<ref<eval_cache::AttrCursor>> std::vector<ref<eval_cache::AttrCursor>>
getCursors(EvalState & state) override; getCursors(EvalState & state) override;
/* Get a cursor to the first attrpath in getActualAttrPaths() that
exists, or throw an exception with suggestions if none exists. */
ref<eval_cache::AttrCursor> getCursor(EvalState & state) override;
std::shared_ptr<flake::LockedFlake> getLockedFlake() const; std::shared_ptr<flake::LockedFlake> getLockedFlake() const;
FlakeRef nixpkgsFlakeRef() const override; FlakeRef nixpkgsFlakeRef() const override;