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#include "lockfile.hh"
#include "store-api.hh"
#include "fetchers/regex.hh"
#include <nlohmann/json.hpp>
namespace nix::flake {
FlakeRef flakeRefFromJson(const nlohmann::json & json)
{
fetchers::Input::Attrs attrs;
for (auto & i : json.items()) {
if (i.value().is_number())
attrs.emplace(i.key(), i.value().get<int64_t>());
else if (i.value().is_string())
attrs.emplace(i.key(), i.value().get<std::string>());
else
throw Error("unsupported input attribute type in lock file");
}
return FlakeRef::fromAttrs(attrs);
}
FlakeRef getFlakeRef(
const nlohmann::json & json,
const char * version3Attr1,
const char * version3Attr2,
const char * version4Attr)
{
auto i = json.find(version4Attr);
if (i != json.end())
return flakeRefFromJson(*i);
// FIXME: remove these.
i = json.find(version3Attr1);
if (i != json.end())
return parseFlakeRef(*i);
i = json.find(version3Attr2);
if (i != json.end())
return parseFlakeRef(*i);
throw Error("attribute '%s' missing in lock file", version4Attr);
}
static TreeInfo parseTreeInfo(const nlohmann::json & json)
{
TreeInfo info;
auto i = json.find("info");
if (i != json.end()) {
const nlohmann::json & i2(*i);
auto j = i2.find("narHash");
if (j != i2.end())
info.narHash = Hash((std::string) *j);
else
throw Error("attribute 'narHash' missing in lock file");
j = i2.find("revCount");
if (j != i2.end())
info.revCount = *j;
j = i2.find("lastModified");
if (j != i2.end())
info.lastModified = *j;
return info;
}
i = json.find("narHash");
if (i != json.end()) {
info.narHash = Hash((std::string) *i);
return info;
}
throw Error("attribute 'info' missing in lock file");
}
LockedInput::LockedInput(const nlohmann::json & json)
: LockedInputs(json)
, lockedRef(getFlakeRef(json, "url", "uri", "locked"))
, originalRef(getFlakeRef(json, "originalUrl", "originalUri", "original"))
, info(parseTreeInfo(json))
{
if (!lockedRef.input->isImmutable())
throw Error("lockfile contains mutable flakeref '%s'", lockedRef);
}
static nlohmann::json treeInfoToJson(const TreeInfo & info)
{
nlohmann::json json;
assert(info.narHash);
json["narHash"] = info.narHash.to_string(SRI);
if (info.revCount)
json["revCount"] = *info.revCount;
if (info.lastModified)
json["lastModified"] = *info.lastModified;
return json;
}
nlohmann::json LockedInput::toJson() const
{
auto json = LockedInputs::toJson();
json["original"] = fetchers::attrsToJson(originalRef.toAttrs());
json["locked"] = fetchers::attrsToJson(lockedRef.toAttrs());
json["info"] = treeInfoToJson(info);
return json;
}
StorePath LockedInput::computeStorePath(Store & store) const
{
return info.computeStorePath(store);
}
LockedInputs::LockedInputs(const nlohmann::json & json)
{
for (auto & i : json["inputs"].items())
inputs.insert_or_assign(i.key(), LockedInput(i.value()));
}
nlohmann::json LockedInputs::toJson() const
{
nlohmann::json json;
{
auto j = nlohmann::json::object();
for (auto & i : inputs)
j[i.first] = i.second.toJson();
json["inputs"] = std::move(j);
}
return json;
}
bool LockedInputs::isImmutable() const
{
for (auto & i : inputs)
if (!i.second.lockedRef.input->isImmutable() || !i.second.isImmutable()) return false;
return true;
}
std::optional<LockedInput *> LockedInputs::findInput(const InputPath & path)
{
assert(!path.empty());
LockedInputs * pos = this;
for (auto & elem : path) {
auto i = pos->inputs.find(elem);
if (i == pos->inputs.end())
return {};
pos = &i->second;
}
return (LockedInput *) pos;
}
void LockedInputs::removeInput(const InputPath & path)
{
assert(!path.empty());
LockedInputs * pos = this;
for (size_t n = 0; n < path.size(); n++) {
auto i = pos->inputs.find(path[n]);
if (i == pos->inputs.end()) return;
if (n + 1 == path.size())
pos->inputs.erase(i);
else
pos = &i->second;
}
}
nlohmann::json LockFile::toJson() const
{
auto json = LockedInputs::toJson();
json["version"] = 4;
return json;
}
LockFile LockFile::read(const Path & path)
{
if (pathExists(path)) {
auto json = nlohmann::json::parse(readFile(path));
auto version = json.value("version", 0);
if (version != 3 && version != 4)
throw Error("lock file '%s' has unsupported version %d", path, version);
return LockFile(json);
} else
return LockFile();
}
std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile)
{
stream << lockFile.toJson().dump(2);
return stream;
}
void LockFile::write(const Path & path) const
{
createDirs(dirOf(path));
writeFile(path, fmt("%s\n", *this));
}
InputPath parseInputPath(std::string_view s)
{
InputPath path;
for (auto & elem : tokenizeString<std::vector<std::string>>(s, "/")) {
if (!std::regex_match(elem, fetchers::flakeIdRegex))
throw Error("invalid flake input path element '%s'", elem);
path.push_back(elem);
}
if (path.empty())
throw Error("flake input path is empty");
return path;
}
}
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