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Merge pull request #8576 from obsidiansystems/findPath-cleanup

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Use a struct not `std::pair` for `SearchPathElem`
This commit is contained in:
Eelco Dolstra 2023-06-26 12:37:06 +02:00 committed by GitHub
commit 8e770dac9f
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 30 additions and 20 deletions
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8
src/libexpr/eval.hh
View file

@ -65,8 +65,12 @@ std::string printValue(const EvalState & state, const Value & v);
std::ostream & operator << (std::ostream & os, const ValueType t);
// FIXME: maybe change this to an std::variant<SourcePath, URL>.
typedef std::pair<std::string, std::string> SearchPathElem;
struct SearchPathElem
{
std::string prefix;
// FIXME: maybe change this to an std::variant<SourcePath, URL>.
std::string path;
};
typedef std::list<SearchPathElem> SearchPath;

33
src/libexpr/parser.y
View file

@ -741,7 +741,10 @@ void EvalState::addToSearchPath(const std::string & s)
path = std::string(s, pos + 1);
}
searchPath.emplace_back(prefix, path);
searchPath.emplace_back(SearchPathElem {
.prefix = prefix,
.path = path,
});
}
@ -755,11 +758,11 @@ SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view p
{
for (auto & i : searchPath) {
std::string suffix;
if (i.first.empty())
if (i.prefix.empty())
suffix = concatStrings("/", path);
else {
auto s = i.first.size();
if (path.compare(0, s, i.first) != 0 ||
auto s = i.prefix.size();
if (path.compare(0, s, i.prefix) != 0 ||
(path.size() > s && path[s] != '/'))
continue;
suffix = path.size() == s ? "" : concatStrings("/", path.substr(s));
@ -785,47 +788,47 @@ SourcePath EvalState::findFile(SearchPath & searchPath, const std::string_view p
std::pair<bool, std::string> EvalState::resolveSearchPathElem(const SearchPathElem & elem)
{
auto i = searchPathResolved.find(elem.second);
auto i = searchPathResolved.find(elem.path);
if (i != searchPathResolved.end()) return i->second;
std::pair<bool, std::string> res;
if (EvalSettings::isPseudoUrl(elem.second)) {
if (EvalSettings::isPseudoUrl(elem.path)) {
try {
auto storePath = fetchers::downloadTarball(
store, EvalSettings::resolvePseudoUrl(elem.second), "source", false).tree.storePath;
store, EvalSettings::resolvePseudoUrl(elem.path), "source", false).tree.storePath;
res = { true, store->toRealPath(storePath) };
} catch (FileTransferError & e) {
logWarning({
.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", elem.second)
.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", elem.path)
});
res = { false, "" };
}
}
else if (hasPrefix(elem.second, "flake:")) {
else if (hasPrefix(elem.path, "flake:")) {
experimentalFeatureSettings.require(Xp::Flakes);
auto flakeRef = parseFlakeRef(elem.second.substr(6), {}, true, false);
debug("fetching flake search path element '%s''", elem.second);
auto flakeRef = parseFlakeRef(elem.path.substr(6), {}, true, false);
debug("fetching flake search path element '%s''", elem.path);
auto storePath = flakeRef.resolve(store).fetchTree(store).first.storePath;
res = { true, store->toRealPath(storePath) };
}
else {
auto path = absPath(elem.second);
auto path = absPath(elem.path);
if (pathExists(path))
res = { true, path };
else {
logWarning({
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", elem.second)
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", elem.path)
});
res = { false, "" };
}
}
debug("resolved search path element '%s' to '%s'", elem.second, res.second);
debug("resolved search path element '%s' to '%s'", elem.path, res.second);
searchPathResolved[elem.second] = res;
searchPathResolved[elem.path] = res;
return res;
}

9
src/libexpr/primops.cc
View file

@ -1656,7 +1656,10 @@ static void prim_findFile(EvalState & state, const PosIdx pos, Value * * args, V
}));
}
searchPath.emplace_back(prefix, path);
searchPath.emplace_back(SearchPathElem {
.prefix = prefix,
.path = path,
});
}
auto path = state.forceStringNoCtx(*args[1], pos, "while evaluating the second argument passed to builtins.findFile");
@ -4129,8 +4132,8 @@ void EvalState::createBaseEnv()
int n = 0;
for (auto & i : searchPath) {
auto attrs = buildBindings(2);
attrs.alloc("path").mkString(i.second);
attrs.alloc("prefix").mkString(i.first);
attrs.alloc("path").mkString(i.path);
attrs.alloc("prefix").mkString(i.prefix);
(v.listElems()[n++] = allocValue())->mkAttrs(attrs);
}
addConstant("__nixPath", v);