forked from lix-project/lix
464 lines
16 KiB
C++
464 lines
16 KiB
C++
#include "flake.hh"
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#include "primops.hh"
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#include "eval-inline.hh"
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#include "fetchGit.hh"
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#include "download.hh"
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#include "args.hh"
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#include <iostream>
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#include <queue>
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#include <regex>
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#include <nlohmann/json.hpp>
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namespace nix {
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/* Read a registry. */
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std::shared_ptr<FlakeRegistry> readRegistry(const Path & path)
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{
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auto registry = std::make_shared<FlakeRegistry>();
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if (!pathExists(path))
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return std::make_shared<FlakeRegistry>();
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auto json = nlohmann::json::parse(readFile(path));
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auto version = json.value("version", 0);
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if (version != 1)
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throw Error("flake registry '%s' has unsupported version %d", path, version);
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auto flakes = json["flakes"];
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for (auto i = flakes.begin(); i != flakes.end(); ++i)
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registry->entries.emplace(i.key(), FlakeRef(i->value("uri", "")));
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return registry;
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}
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/* Write a registry to a file. */
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void writeRegistry(const FlakeRegistry & registry, const Path & path)
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{
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nlohmann::json json;
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json["version"] = 1;
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for (auto elem : registry.entries)
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json["flakes"][elem.first.to_string()] = { {"uri", elem.second.to_string()} };
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createDirs(dirOf(path));
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writeFile(path, json.dump(4)); // The '4' is the number of spaces used in the indentation in the json file.
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}
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LockFile::FlakeEntry readFlakeEntry(nlohmann::json json)
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{
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FlakeRef flakeRef(json["uri"]);
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if (!flakeRef.isImmutable())
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throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", flakeRef.to_string());
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LockFile::FlakeEntry entry(flakeRef);
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auto nonFlakeRequires = json["nonFlakeRequires"];
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for (auto i = nonFlakeRequires.begin(); i != nonFlakeRequires.end(); ++i) {
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FlakeRef flakeRef(i->value("uri", ""));
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if (!flakeRef.isImmutable())
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throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", flakeRef.to_string());
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entry.nonFlakeEntries.insert_or_assign(i.key(), flakeRef);
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}
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auto requires = json["requires"];
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for (auto i = requires.begin(); i != requires.end(); ++i)
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entry.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
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return entry;
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}
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LockFile readLockFile(const Path & path)
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{
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LockFile lockFile;
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if (!pathExists(path))
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return lockFile;
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auto json = nlohmann::json::parse(readFile(path));
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auto version = json.value("version", 0);
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if (version != 1)
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throw Error("lock file '%s' has unsupported version %d", path, version);
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auto nonFlakeRequires = json["nonFlakeRequires"];
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for (auto i = nonFlakeRequires.begin(); i != nonFlakeRequires.end(); ++i) {
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FlakeRef flakeRef(i->value("uri", ""));
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if (!flakeRef.isImmutable())
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throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", flakeRef.to_string());
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lockFile.nonFlakeEntries.insert_or_assign(i.key(), flakeRef);
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}
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auto requires = json["requires"];
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for (auto i = requires.begin(); i != requires.end(); ++i)
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lockFile.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
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return lockFile;
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}
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nlohmann::json flakeEntryToJson(const LockFile::FlakeEntry & entry)
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{
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nlohmann::json json;
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json["uri"] = entry.ref.to_string();
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for (auto & x : entry.nonFlakeEntries)
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json["nonFlakeRequires"][x.first]["uri"] = x.second.to_string();
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for (auto & x : entry.flakeEntries)
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json["requires"][x.first.to_string()] = flakeEntryToJson(x.second);
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return json;
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}
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void writeLockFile(const LockFile & lockFile, const Path & path)
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{
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nlohmann::json json;
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json["version"] = 1;
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json["nonFlakeRequires"] = nlohmann::json::object();
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for (auto & x : lockFile.nonFlakeEntries)
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json["nonFlakeRequires"][x.first]["uri"] = x.second.to_string();
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json["requires"] = nlohmann::json::object();
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for (auto & x : lockFile.flakeEntries)
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json["requires"][x.first.to_string()] = flakeEntryToJson(x.second);
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createDirs(dirOf(path));
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writeFile(path, json.dump(4)); // '4' = indentation in json file
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}
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std::shared_ptr<FlakeRegistry> getGlobalRegistry()
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{
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Path registryFile = settings.nixDataDir + "/nix/flake-registry.json";
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return readRegistry(registryFile);
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}
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Path getUserRegistryPath()
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{
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return getHome() + "/.config/nix/registry.json";
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}
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std::shared_ptr<FlakeRegistry> getUserRegistry()
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{
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return readRegistry(getUserRegistryPath());
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}
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std::shared_ptr<FlakeRegistry> getFlagRegistry()
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{
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// TODO (Nick): Implement this.
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return std::make_shared<FlakeRegistry>();
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}
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const std::vector<std::shared_ptr<FlakeRegistry>> EvalState::getFlakeRegistries()
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{
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std::vector<std::shared_ptr<FlakeRegistry>> registries;
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registries.push_back(getGlobalRegistry());
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registries.push_back(getUserRegistry());
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registries.push_back(getFlagRegistry());
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return registries;
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}
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static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef,
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const std::vector<std::shared_ptr<FlakeRegistry>> & registries,
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std::vector<FlakeRef> pastSearches = {})
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{
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if (registries.empty() && !flakeRef.isDirect())
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throw Error("indirect flake reference '%s' is not allowed", flakeRef.to_string());
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for (std::shared_ptr<FlakeRegistry> registry : registries) {
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auto i = registry->entries.find(flakeRef);
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if (i != registry->entries.end()) {
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auto newRef = i->second;
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if (std::get_if<FlakeRef::IsAlias>(&flakeRef.data)) {
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if (flakeRef.ref) newRef.ref = flakeRef.ref;
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if (flakeRef.rev) newRef.rev = flakeRef.rev;
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}
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std::string errorMsg = "found cycle in flake registries: ";
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for (FlakeRef oldRef : pastSearches) {
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errorMsg += oldRef.to_string();
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if (oldRef == newRef)
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throw Error(errorMsg);
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errorMsg += " - ";
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}
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pastSearches.push_back(newRef);
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return lookupFlake(state, newRef, registries, pastSearches);
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}
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}
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if (!flakeRef.isDirect())
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throw Error("could not resolve flake reference '%s'", flakeRef.to_string());
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return flakeRef;
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}
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static FlakeSourceInfo fetchFlake(EvalState & state, const FlakeRef flakeRef, bool impureIsAllowed = false)
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{
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FlakeRef fRef = lookupFlake(state, flakeRef,
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impureIsAllowed ? state.getFlakeRegistries() : std::vector<std::shared_ptr<FlakeRegistry>>());
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// This only downloads only one revision of the repo, not the entire history.
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if (auto refData = std::get_if<FlakeRef::IsGitHub>(&fRef.data)) {
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if (evalSettings.pureEval && !impureIsAllowed && !fRef.isImmutable())
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throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", fRef.to_string());
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// FIXME: use regular /archive URLs instead? api.github.com
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// might have stricter rate limits.
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auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s",
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refData->owner, refData->repo,
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fRef.rev ? fRef.rev->to_string(Base16, false)
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: fRef.ref ? *fRef.ref : "master");
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std::string accessToken = settings.githubAccessToken.get();
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if (accessToken != "")
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url += "?access_token=" + accessToken;
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auto result = getDownloader()->downloadCached(state.store, url, true, "source",
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Hash(), nullptr, fRef.rev ? 1000000000 : settings.tarballTtl);
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if (!result.etag)
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throw Error("did not receive an ETag header from '%s'", url);
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if (result.etag->size() != 42 || (*result.etag)[0] != '"' || (*result.etag)[41] != '"')
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throw Error("ETag header '%s' from '%s' is not a Git revision", *result.etag, url);
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FlakeSourceInfo info(fRef);
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info.storePath = result.path;
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info.rev = Hash(std::string(*result.etag, 1, result.etag->size() - 2), htSHA1);
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info.flakeRef.rev = info.rev;
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info.flakeRef.ref = {};
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return info;
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}
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// This downloads the entire git history
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else if (auto refData = std::get_if<FlakeRef::IsGit>(&fRef.data)) {
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auto gitInfo = exportGit(state.store, refData->uri, fRef.ref,
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fRef.rev ? fRef.rev->to_string(Base16, false) : "", "source");
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FlakeSourceInfo info(fRef);
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info.storePath = gitInfo.storePath;
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info.rev = Hash(gitInfo.rev, htSHA1);
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info.revCount = gitInfo.revCount;
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info.flakeRef.rev = info.rev;
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// FIXME: ensure info.flakeRef.ref is set.
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return info;
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}
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else if (auto refData = std::get_if<FlakeRef::IsPath>(&fRef.data)) {
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if (!pathExists(refData->path + "/.git"))
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throw Error("flake '%s' does not reference a Git repository", refData->path);
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auto gitInfo = exportGit(state.store, refData->path, {}, "", "source");
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FlakeSourceInfo info(fRef);
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info.storePath = gitInfo.storePath;
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info.rev = Hash(gitInfo.rev, htSHA1);
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info.revCount = gitInfo.revCount;
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info.flakeRef.rev = info.rev;
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return info;
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}
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else abort();
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}
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// This will return the flake which corresponds to a given FlakeRef. The lookupFlake is done within this function.
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Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
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{
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FlakeSourceInfo sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
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debug("got flake source '%s' with revision %s",
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sourceInfo.storePath, sourceInfo.rev.value_or(Hash(htSHA1)).to_string(Base16, false));
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state.store->assertStorePath(sourceInfo.storePath);
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if (state.allowedPaths)
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state.allowedPaths->insert(sourceInfo.storePath);
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Flake flake(flakeRef, std::move(sourceInfo));
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if (std::get_if<FlakeRef::IsGitHub>(&flakeRef.data)) {
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// FIXME: ehm?
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if (flake.sourceInfo.rev)
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flake.ref = FlakeRef(flakeRef.baseRef().to_string()
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+ "/" + flake.sourceInfo.rev->to_string(Base16, false));
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}
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Value vInfo;
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state.evalFile(sourceInfo.storePath + "/flake.nix", vInfo); // FIXME: symlink attack
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state.forceAttrs(vInfo);
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// FIXME: change to "id"?
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if (auto name = vInfo.attrs->get(state.sName))
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flake.id = state.forceStringNoCtx(*(**name).value, *(**name).pos);
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else
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throw Error("flake lacks attribute 'name'");
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if (auto description = vInfo.attrs->get(state.sDescription))
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flake.description = state.forceStringNoCtx(*(**description).value, *(**description).pos);
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if (auto requires = vInfo.attrs->get(state.symbols.create("requires"))) {
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state.forceList(*(**requires).value, *(**requires).pos);
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for (unsigned int n = 0; n < (**requires).value->listSize(); ++n)
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flake.requires.push_back(FlakeRef(state.forceStringNoCtx(
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*(**requires).value->listElems()[n], *(**requires).pos)));
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}
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if (std::optional<Attr *> nonFlakeRequires = vInfo.attrs->get(state.symbols.create("nonFlakeRequires"))) {
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state.forceAttrs(*(**nonFlakeRequires).value, *(**nonFlakeRequires).pos);
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for (Attr attr : *(*(**nonFlakeRequires).value).attrs) {
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std::string myNonFlakeUri = state.forceStringNoCtx(*attr.value, *attr.pos);
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FlakeRef nonFlakeRef = FlakeRef(myNonFlakeUri);
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flake.nonFlakeRequires.insert_or_assign(attr.name, nonFlakeRef);
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}
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}
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if (auto provides = vInfo.attrs->get(state.symbols.create("provides"))) {
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state.forceFunction(*(**provides).value, *(**provides).pos);
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flake.vProvides = (**provides).value;
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} else
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throw Error("flake lacks attribute 'provides'");
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return flake;
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}
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// Get the `NonFlake` corresponding to a `FlakeRef`.
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NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, FlakeAlias alias)
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{
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FlakeSourceInfo sourceInfo = fetchFlake(state, flakeRef);
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debug("got non-flake source '%s' with revision %s",
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sourceInfo.storePath, sourceInfo.rev.value_or(Hash(htSHA1)).to_string(Base16, false));
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auto flakePath = sourceInfo.storePath;
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state.store->assertStorePath(flakePath);
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if (state.allowedPaths)
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state.allowedPaths->insert(flakePath);
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NonFlake nonFlake(flakeRef);
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if (std::get_if<FlakeRef::IsGitHub>(&flakeRef.data)) {
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if (sourceInfo.rev)
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nonFlake.ref = FlakeRef(flakeRef.baseRef().to_string()
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+ "/" + sourceInfo.rev->to_string(Base16, false));
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}
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nonFlake.path = flakePath;
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nonFlake.alias = alias;
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return nonFlake;
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}
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/* Given a flake reference, recursively fetch it and its
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dependencies.
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FIXME: this should return a graph of flakes.
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*/
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Dependencies resolveFlake(EvalState & state, const FlakeRef & topRef,
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RegistryAccess registryAccess, bool isTopFlake)
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{
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Flake flake = getFlake(state, topRef,
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registryAccess == AllowRegistry || (registryAccess == AllowRegistryAtTop && isTopFlake));
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LockFile lockFile;
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if (isTopFlake)
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lockFile = readLockFile(flake.sourceInfo.storePath + "/flake.lock"); // FIXME: symlink attack
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Dependencies deps(flake);
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for (auto & nonFlakeInfo : flake.nonFlakeRequires)
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deps.nonFlakeDeps.push_back(getNonFlake(state, nonFlakeInfo.second, nonFlakeInfo.first));
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for (auto newFlakeRef : flake.requires) {
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auto i = lockFile.flakeEntries.find(newFlakeRef);
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if (i != lockFile.flakeEntries.end()) newFlakeRef = i->second.ref;
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// FIXME: propagate lockFile downwards
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deps.flakeDeps.push_back(resolveFlake(state, newFlakeRef, registryAccess, false));
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}
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return deps;
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}
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LockFile::FlakeEntry dependenciesToFlakeEntry(const Dependencies & deps)
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{
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LockFile::FlakeEntry entry(deps.flake.sourceInfo.flakeRef);
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for (auto & deps : deps.flakeDeps)
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entry.flakeEntries.insert_or_assign(deps.flake.id, dependenciesToFlakeEntry(deps));
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for (auto & nonFlake : deps.nonFlakeDeps)
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entry.nonFlakeEntries.insert_or_assign(nonFlake.alias, nonFlake.ref);
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return entry;
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}
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static LockFile makeLockFile(EvalState & evalState, FlakeRef & flakeRef)
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{
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Dependencies deps = resolveFlake(evalState, flakeRef, AllowRegistry);
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LockFile::FlakeEntry entry = dependenciesToFlakeEntry(deps);
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LockFile lockFile;
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lockFile.flakeEntries = entry.flakeEntries;
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lockFile.nonFlakeEntries = entry.nonFlakeEntries;
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return lockFile;
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}
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void updateLockFile(EvalState & state, const Path & path)
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{
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// FIXME: don't copy 'path' to the store (especially since we
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// dirty it immediately afterwards).
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FlakeRef flakeRef = FlakeRef(path); // FIXME: ugly
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auto lockFile = makeLockFile(state, flakeRef);
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writeLockFile(lockFile, path + "/flake.lock");
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// Hack: Make sure that flake.lock is visible to Git. Otherwise,
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// exportGit will fail to copy it to the Nix store.
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runProgram("git", true, { "-C", path, "add", "flake.lock" });
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}
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void callFlake(EvalState & state, const Dependencies & flake, Value & v)
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{
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// Construct the resulting attrset '{description, provides,
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// ...}'. This attrset is passed lazily as an argument to 'provides'.
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state.mkAttrs(v, flake.flakeDeps.size() + flake.nonFlakeDeps.size() + 4);
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for (auto & dep : flake.flakeDeps) {
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auto vFlake = state.allocAttr(v, dep.flake.id);
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callFlake(state, dep, *vFlake);
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}
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for (auto & dep : flake.nonFlakeDeps) {
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auto vNonFlake = state.allocAttr(v, dep.alias);
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state.mkAttrs(*vNonFlake, 4);
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state.store->isValidPath(dep.path);
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mkString(*state.allocAttr(*vNonFlake, state.sOutPath), dep.path, {dep.path});
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}
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mkString(*state.allocAttr(v, state.sDescription), flake.flake.description);
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auto & path = flake.flake.sourceInfo.storePath;
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state.store->isValidPath(path);
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mkString(*state.allocAttr(v, state.sOutPath), path, {path});
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if (flake.flake.sourceInfo.revCount)
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mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *flake.flake.sourceInfo.revCount);
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auto vProvides = state.allocAttr(v, state.symbols.create("provides"));
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mkApp(*vProvides, *flake.flake.vProvides, v);
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v.attrs->sort();
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}
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// Return the `provides` of the top flake, while assigning to `v` the provides
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// of the dependencies as well.
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void makeFlakeValue(EvalState & state, const FlakeRef & flakeRef, RegistryAccess registryAccess, Value & v)
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{
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callFlake(state, resolveFlake(state, flakeRef, registryAccess), v);
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}
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// This function is exposed to be used in nix files.
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static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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makeFlakeValue(state, state.forceStringNoCtx(*args[0], pos),
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evalSettings.pureEval ? DisallowRegistry : AllowRegistryAtTop, v);
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}
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static RegisterPrimOp r2("getFlake", 1, prim_getFlake);
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}
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