mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-14 10:16:15 +02:00
340 lines
9.9 KiB
C++
340 lines
9.9 KiB
C++
#include "lockfile.hh"
|
|
#include "store-api.hh"
|
|
#include "url-parts.hh"
|
|
|
|
#include <nlohmann/json.hpp>
|
|
|
|
namespace nix::flake {
|
|
|
|
FlakeRef getFlakeRef(
|
|
const nlohmann::json & json,
|
|
const char * attr,
|
|
const char * info)
|
|
{
|
|
auto i = json.find(attr);
|
|
if (i != json.end()) {
|
|
auto attrs = fetchers::jsonToAttrs(*i);
|
|
// FIXME: remove when we drop support for version 5.
|
|
if (info) {
|
|
auto j = json.find(info);
|
|
if (j != json.end()) {
|
|
for (auto k : fetchers::jsonToAttrs(*j))
|
|
attrs.insert_or_assign(k.first, k.second);
|
|
}
|
|
}
|
|
return FlakeRef::fromAttrs(attrs);
|
|
}
|
|
|
|
throw Error("attribute '%s' missing in lock file", attr);
|
|
}
|
|
|
|
LockedNode::LockedNode(const nlohmann::json & json)
|
|
: lockedRef(getFlakeRef(json, "locked", "info"))
|
|
, originalRef(getFlakeRef(json, "original", nullptr))
|
|
, isFlake(json.find("flake") != json.end() ? (bool) json["flake"] : true)
|
|
{
|
|
if (!lockedRef.input.isImmutable())
|
|
throw Error("lockfile contains mutable lock '%s'",
|
|
fetchers::attrsToJson(lockedRef.input.toAttrs()));
|
|
}
|
|
|
|
StorePath LockedNode::computeStorePath(Store & store) const
|
|
{
|
|
return lockedRef.input.computeStorePath(store);
|
|
}
|
|
|
|
std::shared_ptr<Node> LockFile::findInput(const InputPath & path)
|
|
{
|
|
auto pos = root;
|
|
|
|
if (!pos) return {};
|
|
|
|
for (auto & elem : path) {
|
|
if (auto i = get(pos->inputs, elem)) {
|
|
if (auto node = std::get_if<0>(&*i))
|
|
pos = *node;
|
|
else if (auto follows = std::get_if<1>(&*i)) {
|
|
pos = findInput(*follows);
|
|
if (!pos) return {};
|
|
}
|
|
} else
|
|
return {};
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
|
|
LockFile::LockFile(const nlohmann::json & json, const Path & path)
|
|
{
|
|
auto version = json.value("version", 0);
|
|
if (version < 5 || version > 7)
|
|
throw Error("lock file '%s' has unsupported version %d", path, version);
|
|
|
|
std::unordered_map<std::string, std::shared_ptr<Node>> nodeMap;
|
|
|
|
std::function<void(Node & node, const nlohmann::json & jsonNode)> getInputs;
|
|
|
|
getInputs = [&](Node & node, const nlohmann::json & jsonNode)
|
|
{
|
|
if (jsonNode.find("inputs") == jsonNode.end()) return;
|
|
for (auto & i : jsonNode["inputs"].items()) {
|
|
if (i.value().is_array()) {
|
|
InputPath path;
|
|
for (auto & j : i.value())
|
|
path.push_back(j);
|
|
node.inputs.insert_or_assign(i.key(), path);
|
|
} else {
|
|
std::string inputKey = i.value();
|
|
auto k = nodeMap.find(inputKey);
|
|
if (k == nodeMap.end()) {
|
|
auto jsonNode2 = json["nodes"][inputKey];
|
|
auto input = std::make_shared<LockedNode>(jsonNode2);
|
|
k = nodeMap.insert_or_assign(inputKey, input).first;
|
|
getInputs(*input, jsonNode2);
|
|
}
|
|
if (auto child = std::dynamic_pointer_cast<LockedNode>(k->second))
|
|
node.inputs.insert_or_assign(i.key(), child);
|
|
else
|
|
// FIXME: replace by follows node
|
|
throw Error("lock file contains cycle to root node");
|
|
}
|
|
}
|
|
};
|
|
|
|
std::string rootKey = json["root"];
|
|
nodeMap.insert_or_assign(rootKey, root);
|
|
getInputs(*root, json["nodes"][rootKey]);
|
|
|
|
// FIXME: check that there are no cycles in version >= 7. Cycles
|
|
// between inputs are only possible using 'follows' indirections.
|
|
// Once we drop support for version <= 6, we can simplify the code
|
|
// a bit since we don't need to worry about cycles.
|
|
}
|
|
|
|
nlohmann::json LockFile::toJson() const
|
|
{
|
|
nlohmann::json nodes;
|
|
std::unordered_map<std::shared_ptr<const Node>, std::string> nodeKeys;
|
|
std::unordered_set<std::string> keys;
|
|
|
|
std::function<std::string(const std::string & key, std::shared_ptr<const Node> node)> dumpNode;
|
|
|
|
dumpNode = [&](std::string key, std::shared_ptr<const Node> node) -> std::string
|
|
{
|
|
auto k = nodeKeys.find(node);
|
|
if (k != nodeKeys.end())
|
|
return k->second;
|
|
|
|
if (!keys.insert(key).second) {
|
|
for (int n = 2; ; ++n) {
|
|
auto k = fmt("%s_%d", key, n);
|
|
if (keys.insert(k).second) {
|
|
key = k;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
nodeKeys.insert_or_assign(node, key);
|
|
|
|
auto n = nlohmann::json::object();
|
|
|
|
if (!node->inputs.empty()) {
|
|
auto inputs = nlohmann::json::object();
|
|
for (auto & i : node->inputs) {
|
|
if (auto child = std::get_if<0>(&i.second)) {
|
|
inputs[i.first] = dumpNode(i.first, *child);
|
|
} else if (auto follows = std::get_if<1>(&i.second)) {
|
|
auto arr = nlohmann::json::array();
|
|
for (auto & x : *follows)
|
|
arr.push_back(x);
|
|
inputs[i.first] = std::move(arr);
|
|
}
|
|
}
|
|
n["inputs"] = std::move(inputs);
|
|
}
|
|
|
|
if (auto lockedNode = std::dynamic_pointer_cast<const LockedNode>(node)) {
|
|
n["original"] = fetchers::attrsToJson(lockedNode->originalRef.toAttrs());
|
|
n["locked"] = fetchers::attrsToJson(lockedNode->lockedRef.toAttrs());
|
|
if (!lockedNode->isFlake) n["flake"] = false;
|
|
}
|
|
|
|
nodes[key] = std::move(n);
|
|
|
|
return key;
|
|
};
|
|
|
|
nlohmann::json json;
|
|
json["version"] = 7;
|
|
json["root"] = dumpNode("root", root);
|
|
json["nodes"] = std::move(nodes);
|
|
|
|
return json;
|
|
}
|
|
|
|
std::string LockFile::to_string() const
|
|
{
|
|
return toJson().dump(2);
|
|
}
|
|
|
|
LockFile LockFile::read(const Path & path)
|
|
{
|
|
if (!pathExists(path)) return LockFile();
|
|
return LockFile(nlohmann::json::parse(readFile(path)), path);
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
bool LockFile::isImmutable() const
|
|
{
|
|
std::unordered_set<std::shared_ptr<const Node>> nodes;
|
|
|
|
std::function<void(std::shared_ptr<const Node> node)> visit;
|
|
|
|
visit = [&](std::shared_ptr<const Node> node)
|
|
{
|
|
if (!nodes.insert(node).second) return;
|
|
for (auto & i : node->inputs)
|
|
if (auto child = std::get_if<0>(&i.second))
|
|
visit(*child);
|
|
};
|
|
|
|
visit(root);
|
|
|
|
for (auto & i : nodes) {
|
|
if (i == root) continue;
|
|
auto lockedNode = std::dynamic_pointer_cast<const LockedNode>(i);
|
|
if (lockedNode && !lockedNode->lockedRef.input.isImmutable()) return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool LockFile::operator ==(const LockFile & other) const
|
|
{
|
|
// FIXME: slow
|
|
return toJson() == other.toJson();
|
|
}
|
|
|
|
InputPath parseInputPath(std::string_view s)
|
|
{
|
|
InputPath path;
|
|
|
|
for (auto & elem : tokenizeString<std::vector<std::string>>(s, "/")) {
|
|
if (!std::regex_match(elem, flakeIdRegex))
|
|
throw UsageError("invalid flake input path element '%s'", elem);
|
|
path.push_back(elem);
|
|
}
|
|
|
|
return path;
|
|
}
|
|
|
|
std::map<InputPath, Node::Edge> LockFile::getAllInputs() const
|
|
{
|
|
std::unordered_set<std::shared_ptr<Node>> done;
|
|
std::map<InputPath, Node::Edge> res;
|
|
|
|
std::function<void(const InputPath & prefix, std::shared_ptr<Node> node)> recurse;
|
|
|
|
recurse = [&](const InputPath & prefix, std::shared_ptr<Node> node)
|
|
{
|
|
if (!done.insert(node).second) return;
|
|
|
|
for (auto &[id, input] : node->inputs) {
|
|
auto inputPath(prefix);
|
|
inputPath.push_back(id);
|
|
res.emplace(inputPath, input);
|
|
if (auto child = std::get_if<0>(&input))
|
|
recurse(inputPath, *child);
|
|
}
|
|
};
|
|
|
|
recurse({}, root);
|
|
|
|
return res;
|
|
}
|
|
|
|
std::ostream & operator <<(std::ostream & stream, const Node::Edge & edge)
|
|
{
|
|
if (auto node = std::get_if<0>(&edge))
|
|
stream << "'" << (*node)->lockedRef << "'";
|
|
else if (auto follows = std::get_if<1>(&edge))
|
|
stream << fmt("follows '%s'", printInputPath(*follows));
|
|
return stream;
|
|
}
|
|
|
|
static bool equals(const Node::Edge & e1, const Node::Edge & e2)
|
|
{
|
|
if (auto n1 = std::get_if<0>(&e1))
|
|
if (auto n2 = std::get_if<0>(&e2))
|
|
return (*n1)->lockedRef == (*n2)->lockedRef;
|
|
if (auto f1 = std::get_if<1>(&e1))
|
|
if (auto f2 = std::get_if<1>(&e2))
|
|
return *f1 == *f2;
|
|
return false;
|
|
}
|
|
|
|
std::string LockFile::diff(const LockFile & oldLocks, const LockFile & newLocks)
|
|
{
|
|
auto oldFlat = oldLocks.getAllInputs();
|
|
auto newFlat = newLocks.getAllInputs();
|
|
|
|
auto i = oldFlat.begin();
|
|
auto j = newFlat.begin();
|
|
std::string res;
|
|
|
|
while (i != oldFlat.end() || j != newFlat.end()) {
|
|
if (j != newFlat.end() && (i == oldFlat.end() || i->first > j->first)) {
|
|
res += fmt("* Added '%s': %s\n", printInputPath(j->first), j->second);
|
|
++j;
|
|
} else if (i != oldFlat.end() && (j == newFlat.end() || i->first < j->first)) {
|
|
res += fmt("* Removed '%s'\n", printInputPath(i->first));
|
|
++i;
|
|
} else {
|
|
if (!equals(i->second, j->second)) {
|
|
res += fmt("* Updated '%s': %s -> %s\n",
|
|
printInputPath(i->first),
|
|
i->second,
|
|
j->second);
|
|
}
|
|
++i;
|
|
++j;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void LockFile::check()
|
|
{
|
|
auto inputs = getAllInputs();
|
|
|
|
for (auto & [inputPath, input] : inputs) {
|
|
if (auto follows = std::get_if<1>(&input)) {
|
|
if (!follows->empty() && !get(inputs, *follows))
|
|
throw Error("input '%s' follows a non-existent input '%s'",
|
|
printInputPath(inputPath),
|
|
printInputPath(*follows));
|
|
}
|
|
}
|
|
}
|
|
|
|
void check();
|
|
|
|
std::string printInputPath(const InputPath & path)
|
|
{
|
|
return concatStringsSep("/", path);
|
|
}
|
|
|
|
}
|