mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-11 08:46:16 +02:00
356 lines
10 KiB
C++
356 lines
10 KiB
C++
#include "lockfile.hh"
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#include "store-api.hh"
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#include "url-parts.hh"
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#include <iomanip>
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#include <nlohmann/json.hpp>
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namespace nix::flake {
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FlakeRef getFlakeRef(
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const nlohmann::json & json,
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const char * attr,
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const char * info)
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{
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auto i = json.find(attr);
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if (i != json.end()) {
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auto attrs = fetchers::jsonToAttrs(*i);
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// FIXME: remove when we drop support for version 5.
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if (info) {
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auto j = json.find(info);
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if (j != json.end()) {
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for (auto k : fetchers::jsonToAttrs(*j))
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attrs.insert_or_assign(k.first, k.second);
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}
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}
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return FlakeRef::fromAttrs(attrs);
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}
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throw Error("attribute '%s' missing in lock file", attr);
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}
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LockedNode::LockedNode(const nlohmann::json & json)
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: lockedRef(getFlakeRef(json, "locked", "info"))
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, originalRef(getFlakeRef(json, "original", nullptr))
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, isFlake(json.find("flake") != json.end() ? (bool) json["flake"] : true)
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{
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if (!lockedRef.input.isLocked())
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throw Error("lockfile contains mutable lock '%s'",
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fetchers::attrsToJSON(lockedRef.input.toAttrs()));
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}
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StorePath LockedNode::computeStorePath(Store & store) const
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{
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return lockedRef.input.computeStorePath(store);
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}
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std::shared_ptr<Node> LockFile::findInput(const InputPath & path)
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{
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auto pos = root;
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if (!pos) return {};
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for (auto & elem : path) {
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if (auto i = get(pos->inputs, elem)) {
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if (auto node = std::get_if<0>(&*i))
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pos = *node;
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else if (auto follows = std::get_if<1>(&*i)) {
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pos = findInput(*follows);
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if (!pos) return {};
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}
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} else
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return {};
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}
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return pos;
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}
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LockFile::LockFile(const nlohmann::json & json, const Path & path)
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{
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auto version = json.value("version", 0);
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if (version < 5 || version > 7)
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throw Error("lock file '%s' has unsupported version %d", path, version);
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std::unordered_map<std::string, std::shared_ptr<Node>> nodeMap;
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std::function<void(Node & node, const nlohmann::json & jsonNode)> getInputs;
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getInputs = [&](Node & node, const nlohmann::json & jsonNode)
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{
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if (jsonNode.find("inputs") == jsonNode.end()) return;
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for (auto & i : jsonNode["inputs"].items()) {
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if (i.value().is_array()) { // FIXME: remove, obsolete
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InputPath path;
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for (auto & j : i.value())
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path.push_back(j);
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node.inputs.insert_or_assign(i.key(), path);
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} else {
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std::string inputKey = i.value();
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auto k = nodeMap.find(inputKey);
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if (k == nodeMap.end()) {
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auto nodes = json["nodes"];
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auto jsonNode2 = nodes.find(inputKey);
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if (jsonNode2 == nodes.end())
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throw Error("lock file references missing node '%s'", inputKey);
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auto input = std::make_shared<LockedNode>(*jsonNode2);
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k = nodeMap.insert_or_assign(inputKey, input).first;
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getInputs(*input, *jsonNode2);
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}
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if (auto child = std::dynamic_pointer_cast<LockedNode>(k->second))
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node.inputs.insert_or_assign(i.key(), child);
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else
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// FIXME: replace by follows node
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throw Error("lock file contains cycle to root node");
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}
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}
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};
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std::string rootKey = json["root"];
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nodeMap.insert_or_assign(rootKey, root);
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getInputs(*root, json["nodes"][rootKey]);
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// FIXME: check that there are no cycles in version >= 7. Cycles
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// between inputs are only possible using 'follows' indirections.
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// Once we drop support for version <= 6, we can simplify the code
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// a bit since we don't need to worry about cycles.
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}
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nlohmann::json LockFile::toJSON() const
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{
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nlohmann::json nodes;
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std::unordered_map<std::shared_ptr<const Node>, std::string> nodeKeys;
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std::unordered_set<std::string> keys;
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std::function<std::string(const std::string & key, std::shared_ptr<const Node> node)> dumpNode;
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dumpNode = [&](std::string key, std::shared_ptr<const Node> node) -> std::string
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{
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auto k = nodeKeys.find(node);
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if (k != nodeKeys.end())
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return k->second;
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if (!keys.insert(key).second) {
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for (int n = 2; ; ++n) {
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auto k = fmt("%s_%d", key, n);
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if (keys.insert(k).second) {
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key = k;
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break;
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}
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}
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}
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nodeKeys.insert_or_assign(node, key);
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auto n = nlohmann::json::object();
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if (!node->inputs.empty()) {
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auto inputs = nlohmann::json::object();
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for (auto & i : node->inputs) {
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if (auto child = std::get_if<0>(&i.second)) {
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inputs[i.first] = dumpNode(i.first, *child);
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} else if (auto follows = std::get_if<1>(&i.second)) {
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auto arr = nlohmann::json::array();
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for (auto & x : *follows)
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arr.push_back(x);
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inputs[i.first] = std::move(arr);
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}
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}
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n["inputs"] = std::move(inputs);
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}
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if (auto lockedNode = std::dynamic_pointer_cast<const LockedNode>(node)) {
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n["original"] = fetchers::attrsToJSON(lockedNode->originalRef.toAttrs());
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n["locked"] = fetchers::attrsToJSON(lockedNode->lockedRef.toAttrs());
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if (!lockedNode->isFlake) n["flake"] = false;
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}
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nodes[key] = std::move(n);
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return key;
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};
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nlohmann::json json;
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json["version"] = 7;
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json["root"] = dumpNode("root", root);
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json["nodes"] = std::move(nodes);
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return json;
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}
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std::string LockFile::to_string() const
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{
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return toJSON().dump(2);
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}
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LockFile LockFile::read(const Path & path)
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{
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if (!pathExists(path)) return LockFile();
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return LockFile(nlohmann::json::parse(readFile(path)), path);
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}
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std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile)
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{
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stream << lockFile.toJSON().dump(2);
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return stream;
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}
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void LockFile::write(const Path & path) const
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{
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createDirs(dirOf(path));
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writeFile(path, fmt("%s\n", *this));
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}
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bool LockFile::isImmutable() const
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{
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std::unordered_set<std::shared_ptr<const Node>> nodes;
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std::function<void(std::shared_ptr<const Node> node)> visit;
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visit = [&](std::shared_ptr<const Node> node)
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{
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if (!nodes.insert(node).second) return;
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for (auto & i : node->inputs)
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if (auto child = std::get_if<0>(&i.second))
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visit(*child);
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};
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visit(root);
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for (auto & i : nodes) {
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if (i == root) continue;
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auto lockedNode = std::dynamic_pointer_cast<const LockedNode>(i);
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if (lockedNode && !lockedNode->lockedRef.input.isLocked()) return false;
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}
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return true;
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}
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bool LockFile::operator ==(const LockFile & other) const
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{
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// FIXME: slow
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return toJSON() == other.toJSON();
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}
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InputPath parseInputPath(std::string_view s)
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{
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InputPath path;
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for (auto & elem : tokenizeString<std::vector<std::string>>(s, "/")) {
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if (!std::regex_match(elem, flakeIdRegex))
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throw UsageError("invalid flake input path element '%s'", elem);
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path.push_back(elem);
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}
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return path;
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}
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std::map<InputPath, Node::Edge> LockFile::getAllInputs() const
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{
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std::unordered_set<std::shared_ptr<Node>> done;
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std::map<InputPath, Node::Edge> res;
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std::function<void(const InputPath & prefix, std::shared_ptr<Node> node)> recurse;
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recurse = [&](const InputPath & prefix, std::shared_ptr<Node> node)
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{
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if (!done.insert(node).second) return;
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for (auto &[id, input] : node->inputs) {
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auto inputPath(prefix);
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inputPath.push_back(id);
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res.emplace(inputPath, input);
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if (auto child = std::get_if<0>(&input))
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recurse(inputPath, *child);
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}
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};
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recurse({}, root);
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return res;
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}
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static std::string describe(const FlakeRef & flakeRef)
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{
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auto s = fmt("'%s'", flakeRef.to_string());
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if (auto lastModified = flakeRef.input.getLastModified())
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s += fmt(" (%s)", std::put_time(std::gmtime(&*lastModified), "%Y-%m-%d"));
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return s;
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}
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std::ostream & operator <<(std::ostream & stream, const Node::Edge & edge)
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{
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if (auto node = std::get_if<0>(&edge))
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stream << describe((*node)->lockedRef);
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else if (auto follows = std::get_if<1>(&edge))
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stream << fmt("follows '%s'", printInputPath(*follows));
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return stream;
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}
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static bool equals(const Node::Edge & e1, const Node::Edge & e2)
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{
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if (auto n1 = std::get_if<0>(&e1))
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if (auto n2 = std::get_if<0>(&e2))
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return (*n1)->lockedRef == (*n2)->lockedRef;
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if (auto f1 = std::get_if<1>(&e1))
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if (auto f2 = std::get_if<1>(&e2))
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return *f1 == *f2;
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return false;
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}
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std::string LockFile::diff(const LockFile & oldLocks, const LockFile & newLocks)
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{
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auto oldFlat = oldLocks.getAllInputs();
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auto newFlat = newLocks.getAllInputs();
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auto i = oldFlat.begin();
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auto j = newFlat.begin();
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std::string res;
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while (i != oldFlat.end() || j != newFlat.end()) {
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if (j != newFlat.end() && (i == oldFlat.end() || i->first > j->first)) {
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res += fmt("• " ANSI_GREEN "Added input '%s':" ANSI_NORMAL "\n %s\n",
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printInputPath(j->first), j->second);
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++j;
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} else if (i != oldFlat.end() && (j == newFlat.end() || i->first < j->first)) {
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res += fmt("• " ANSI_RED "Removed input '%s'" ANSI_NORMAL "\n", printInputPath(i->first));
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++i;
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} else {
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if (!equals(i->second, j->second)) {
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res += fmt("• " ANSI_BOLD "Updated input '%s':" ANSI_NORMAL "\n %s\n → %s\n",
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printInputPath(i->first),
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i->second,
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j->second);
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}
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++i;
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++j;
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}
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}
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return res;
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}
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void LockFile::check()
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{
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auto inputs = getAllInputs();
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for (auto & [inputPath, input] : inputs) {
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if (auto follows = std::get_if<1>(&input)) {
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if (!follows->empty() && !get(inputs, *follows))
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throw Error("input '%s' follows a non-existent input '%s'",
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printInputPath(inputPath),
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printInputPath(*follows));
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}
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}
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}
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void check();
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std::string printInputPath(const InputPath & path)
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{
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return concatStringsSep("/", path);
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}
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}
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