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Clean up resolveSearchPathElem

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We should use `std::optional<std::string>` not `std::pair<bool,
std::string>` for an optional string.
This commit is contained in:
John Ericson 2023-06-23 12:31:09 -04:00
parent 8d871e1822
commit 87dcd09047
3 changed files with 37 additions and 30 deletions
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45
src/libexpr/parser.y
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@ -772,9 +772,9 @@ SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view p
continue;
suffix = path.size() == s ? "" : concatStrings("/", path.substr(s));
}
auto r = resolveSearchPathElem(i);
if (!r.first) continue;
Path res = r.second + suffix;
auto r = resolveSearchPathElem(i.path);
if (!r) continue;
Path res = *r + suffix;
if (pathExists(res)) return CanonPath(canonPath(res));
}
@ -791,49 +791,52 @@ SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view p
}
std::pair<bool, std::string> EvalState::resolveSearchPathElem(const SearchPathElem & elem)
std::optional<std::string> EvalState::resolveSearchPathElem(const std::string & value)
{
auto i = searchPathResolved.find(elem.path);
auto i = searchPathResolved.find(value);
if (i != searchPathResolved.end()) return i->second;
std::pair<bool, std::string> res;
std::optional<std::string> res;
if (EvalSettings::isPseudoUrl(elem.path)) {
if (EvalSettings::isPseudoUrl(value)) {
try {
auto storePath = fetchers::downloadTarball(
store, EvalSettings::resolvePseudoUrl(elem.path), "source", false).tree.storePath;
res = { true, store->toRealPath(storePath) };
store, EvalSettings::resolvePseudoUrl(value), "source", false).tree.storePath;
res = { store->toRealPath(storePath) };
} catch (FileTransferError & e) {
logWarning({
.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", elem.path)
.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
});
res = { false, "" };
res = std::nullopt;
}
}
else if (hasPrefix(elem.path, "flake:")) {
else if (hasPrefix(value, "flake:")) {
experimentalFeatureSettings.require(Xp::Flakes);
auto flakeRef = parseFlakeRef(elem.path.substr(6), {}, true, false);
debug("fetching flake search path element '%s''", elem.path);
auto flakeRef = parseFlakeRef(value.substr(6), {}, true, false);
debug("fetching flake search path element '%s''", value);
auto storePath = flakeRef.resolve(store).fetchTree(store).first.storePath;
res = { true, store->toRealPath(storePath) };
res = { store->toRealPath(storePath) };
}
else {
auto path = absPath(elem.path);
auto path = absPath(value);
if (pathExists(path))
res = { true, path };
res = { path };
else {
logWarning({
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", elem.path)
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", value)
});
res = { false, "" };
res = std::nullopt;
}
}
debug("resolved search path element '%s' to '%s'", elem.path, res.second);
if (res)
debug("resolved search path element '%s' to '%s'", value, *res);
else
debug("failed to resolve search path element '%s'", value);
searchPathResolved[elem.path] = res;
searchPathResolved[value] = res;
return res;
}