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-rw-r--r--src/libexpr/primops/flake.cc604
1 files changed, 0 insertions, 604 deletions
diff --git a/src/libexpr/primops/flake.cc b/src/libexpr/primops/flake.cc
deleted file mode 100644
index 793d6da35..000000000
--- a/src/libexpr/primops/flake.cc
+++ /dev/null
@@ -1,604 +0,0 @@
-#include "flake.hh"
-#include "lockfile.hh"
-#include "primops.hh"
-#include "eval-inline.hh"
-#include "fetchGit.hh"
-#include "download.hh"
-#include "args.hh"
-
-#include <iostream>
-#include <queue>
-#include <regex>
-#include <ctime>
-#include <iomanip>
-#include <nlohmann/json.hpp>
-
-namespace nix {
-
-using namespace flake;
-
-namespace flake {
-
-/* Read a registry. */
-std::shared_ptr<FlakeRegistry> readRegistry(const Path & path)
-{
- auto registry = std::make_shared<FlakeRegistry>();
-
- if (!pathExists(path))
- return std::make_shared<FlakeRegistry>();
-
- auto json = nlohmann::json::parse(readFile(path));
-
- auto version = json.value("version", 0);
- if (version != 1)
- throw Error("flake registry '%s' has unsupported version %d", path, version);
-
- auto flakes = json["flakes"];
- for (auto i = flakes.begin(); i != flakes.end(); ++i)
- registry->entries.emplace(i.key(), FlakeRef(i->value("uri", "")));
-
- return registry;
-}
-
-/* Write a registry to a file. */
-void writeRegistry(const FlakeRegistry & registry, const Path & path)
-{
- nlohmann::json json;
- json["version"] = 2;
- for (auto elem : registry.entries)
- json["flakes"][elem.first.to_string()] = { {"uri", elem.second.to_string()} };
- createDirs(dirOf(path));
- writeFile(path, json.dump(4)); // The '4' is the number of spaces used in the indentation in the json file.
-}
-
-Path getUserRegistryPath()
-{
- return getHome() + "/.config/nix/registry.json";
-}
-
-std::shared_ptr<FlakeRegistry> getUserRegistry()
-{
- return readRegistry(getUserRegistryPath());
-}
-
-std::shared_ptr<FlakeRegistry> getFlagRegistry(RegistryOverrides registryOverrides)
-{
- auto flagRegistry = std::make_shared<FlakeRegistry>();
- for (auto const & x : registryOverrides) {
- flagRegistry->entries.insert_or_assign(FlakeRef(x.first), FlakeRef(x.second));
- }
- return flagRegistry;
-}
-
-static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const Registries & registries,
- std::vector<FlakeRef> pastSearches = {});
-
-FlakeRef updateFlakeRef(EvalState & state, const FlakeRef & newRef, const Registries & registries, std::vector<FlakeRef> pastSearches)
-{
- std::string errorMsg = "found cycle in flake registries: ";
- for (FlakeRef oldRef : pastSearches) {
- errorMsg += oldRef.to_string();
- if (oldRef == newRef)
- throw Error(errorMsg);
- errorMsg += " - ";
- }
- pastSearches.push_back(newRef);
- return lookupFlake(state, newRef, registries, pastSearches);
-}
-
-static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const Registries & registries,
- std::vector<FlakeRef> pastSearches)
-{
- if (registries.empty() && !flakeRef.isDirect())
- throw Error("indirect flake reference '%s' is not allowed", flakeRef);
-
- for (std::shared_ptr<FlakeRegistry> registry : registries) {
- auto i = registry->entries.find(flakeRef);
- if (i != registry->entries.end()) {
- auto newRef = i->second;
- return updateFlakeRef(state, newRef, registries, pastSearches);
- }
-
- auto j = registry->entries.find(flakeRef.baseRef());
- if (j != registry->entries.end()) {
- auto newRef = j->second;
- newRef.ref = flakeRef.ref;
- newRef.rev = flakeRef.rev;
- return updateFlakeRef(state, newRef, registries, pastSearches);
- }
- }
-
- if (!flakeRef.isDirect())
- throw Error("could not resolve flake reference '%s'", flakeRef);
-
- return flakeRef;
-}
-
-// Lookups happen here too
-static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
-{
- FlakeRef resolvedRef = lookupFlake(state, flakeRef,
- impureIsAllowed ? state.getFlakeRegistries() : std::vector<std::shared_ptr<FlakeRegistry>>());
-
- if (evalSettings.pureEval && !impureIsAllowed && !resolvedRef.isImmutable())
- throw Error("requested to fetch mutable flake '%s' in pure mode", resolvedRef);
-
- auto doGit = [&](const GitInfo & gitInfo) {
- FlakeRef ref(resolvedRef.baseRef());
- ref.ref = gitInfo.ref;
- ref.rev = gitInfo.rev;
- SourceInfo info(ref);
- info.storePath = gitInfo.storePath;
- info.revCount = gitInfo.revCount;
- info.narHash = state.store->queryPathInfo(info.storePath)->narHash;
- info.lastModified = gitInfo.lastModified;
- return info;
- };
-
- // This only downloads only one revision of the repo, not the entire history.
- if (auto refData = std::get_if<FlakeRef::IsGitHub>(&resolvedRef.data)) {
-
- // FIXME: use regular /archive URLs instead? api.github.com
- // might have stricter rate limits.
-
- auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s",
- refData->owner, refData->repo,
- resolvedRef.rev ? resolvedRef.rev->to_string(Base16, false)
- : resolvedRef.ref ? *resolvedRef.ref : "master");
-
- std::string accessToken = settings.githubAccessToken.get();
- if (accessToken != "")
- url += "?access_token=" + accessToken;
-
- CachedDownloadRequest request(url);
- request.unpack = true;
- request.name = "source";
- request.ttl = resolvedRef.rev ? 1000000000 : settings.tarballTtl;
- request.getLastModified = true;
- auto result = getDownloader()->downloadCached(state.store, request);
-
- if (!result.etag)
- throw Error("did not receive an ETag header from '%s'", url);
-
- if (result.etag->size() != 42 || (*result.etag)[0] != '"' || (*result.etag)[41] != '"')
- throw Error("ETag header '%s' from '%s' is not a Git revision", *result.etag, url);
-
- FlakeRef ref(resolvedRef.baseRef());
- ref.rev = Hash(std::string(*result.etag, 1, result.etag->size() - 2), htSHA1);
- SourceInfo info(ref);
- info.storePath = result.storePath;
- info.narHash = state.store->queryPathInfo(info.storePath)->narHash;
- info.lastModified = result.lastModified;
-
- return info;
- }
-
- // This downloads the entire git history
- else if (auto refData = std::get_if<FlakeRef::IsGit>(&resolvedRef.data)) {
- return doGit(exportGit(state.store, refData->uri, resolvedRef.ref, resolvedRef.rev, "source"));
- }
-
- else if (auto refData = std::get_if<FlakeRef::IsPath>(&resolvedRef.data)) {
- if (!pathExists(refData->path + "/.git"))
- throw Error("flake '%s' does not reference a Git repository", refData->path);
- return doGit(exportGit(state.store, refData->path, {}, {}, "source"));
- }
-
- else abort();
-}
-
-// This will return the flake which corresponds to a given FlakeRef. The lookupFlake is done within `fetchFlake`, which is used here.
-Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
-{
- SourceInfo sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
- debug("got flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
-
- FlakeRef resolvedRef = sourceInfo.resolvedRef;
-
- state.store->assertStorePath(sourceInfo.storePath);
-
- if (state.allowedPaths)
- state.allowedPaths->insert(state.store->toRealPath(sourceInfo.storePath));
-
- // Guard against symlink attacks.
- Path flakeFile = canonPath(sourceInfo.storePath + "/" + resolvedRef.subdir + "/flake.nix");
- Path realFlakeFile = state.store->toRealPath(flakeFile);
- if (!isInDir(realFlakeFile, state.store->toRealPath(sourceInfo.storePath)))
- throw Error("'flake.nix' file of flake '%s' escapes from '%s'", resolvedRef, sourceInfo.storePath);
-
- Flake flake(flakeRef, sourceInfo);
-
- if (!pathExists(realFlakeFile))
- throw Error("source tree referenced by '%s' does not contain a '%s/flake.nix' file", resolvedRef, resolvedRef.subdir);
-
- Value vInfo;
- state.evalFile(realFlakeFile, vInfo); // FIXME: symlink attack
-
- state.forceAttrs(vInfo);
-
- auto sEpoch = state.symbols.create("epoch");
-
- if (auto epoch = vInfo.attrs->get(sEpoch)) {
- flake.epoch = state.forceInt(*(**epoch).value, *(**epoch).pos);
- if (flake.epoch > 201906)
- throw Error("flake '%s' requires unsupported epoch %d; please upgrade Nix", flakeRef, flake.epoch);
- } else
- throw Error("flake '%s' lacks attribute 'epoch'", flakeRef);
-
- if (auto name = vInfo.attrs->get(state.sName))
- flake.id = state.forceStringNoCtx(*(**name).value, *(**name).pos);
- else
- throw Error("flake '%s' lacks attribute 'name'", flakeRef);
-
- if (auto description = vInfo.attrs->get(state.sDescription))
- flake.description = state.forceStringNoCtx(*(**description).value, *(**description).pos);
-
- auto sInputs = state.symbols.create("inputs");
-
- if (auto inputs = vInfo.attrs->get(sInputs)) {
- state.forceList(*(**inputs).value, *(**inputs).pos);
- for (unsigned int n = 0; n < (**inputs).value->listSize(); ++n)
- flake.inputs.push_back(FlakeRef(state.forceStringNoCtx(
- *(**inputs).value->listElems()[n], *(**inputs).pos)));
- }
-
- auto sNonFlakeInputs = state.symbols.create("nonFlakeInputs");
-
- if (std::optional<Attr *> nonFlakeInputs = vInfo.attrs->get(sNonFlakeInputs)) {
- state.forceAttrs(*(**nonFlakeInputs).value, *(**nonFlakeInputs).pos);
- for (Attr attr : *(*(**nonFlakeInputs).value).attrs) {
- std::string myNonFlakeUri = state.forceStringNoCtx(*attr.value, *attr.pos);
- FlakeRef nonFlakeRef = FlakeRef(myNonFlakeUri);
- flake.nonFlakeInputs.insert_or_assign(attr.name, nonFlakeRef);
- }
- }
-
- auto sOutputs = state.symbols.create("outputs");
-
- if (auto outputs = vInfo.attrs->get(sOutputs)) {
- state.forceFunction(*(**outputs).value, *(**outputs).pos);
- flake.vOutputs = (**outputs).value;
- } else
- throw Error("flake '%s' lacks attribute 'outputs'", flakeRef);
-
- for (auto & attr : *vInfo.attrs) {
- if (attr.name != sEpoch &&
- attr.name != state.sName &&
- attr.name != state.sDescription &&
- attr.name != sInputs &&
- attr.name != sNonFlakeInputs &&
- attr.name != sOutputs)
- throw Error("flake '%s' has an unsupported attribute '%s', at %s",
- flakeRef, attr.name, *attr.pos);
- }
-
- return flake;
-}
-
-// Get the `NonFlake` corresponding to a `FlakeRef`.
-NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
-{
- auto sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
- debug("got non-flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
-
- FlakeRef resolvedRef = sourceInfo.resolvedRef;
-
- NonFlake nonFlake(flakeRef, sourceInfo);
-
- state.store->assertStorePath(nonFlake.sourceInfo.storePath);
-
- if (state.allowedPaths)
- state.allowedPaths->insert(nonFlake.sourceInfo.storePath);
-
- return nonFlake;
-}
-
-bool allowedToWrite(HandleLockFile handle)
-{
- return handle == UpdateLockFile || handle == RecreateLockFile;
-}
-
-bool recreateLockFile(HandleLockFile handle)
-{
- return handle == RecreateLockFile || handle == UseNewLockFile;
-}
-
-bool allowedToUseRegistries(HandleLockFile handle, bool isTopRef)
-{
- if (handle == AllPure) return false;
- else if (handle == TopRefUsesRegistries) return isTopRef;
- else if (handle == UpdateLockFile) return true;
- else if (handle == UseUpdatedLockFile) return true;
- else if (handle == RecreateLockFile) return true;
- else if (handle == UseNewLockFile) return true;
- else assert(false);
-}
-
-/* Given a flakeref and its subtree of the lockfile, return an updated
- subtree of the lockfile. That is, if the 'flake.nix' of the
- referenced flake has inputs that don't have a corresponding entry
- in the lockfile, they're added to the lockfile; conversely, any
- lockfile entries that don't have a corresponding entry in flake.nix
- are removed.
-
- Note that this is lazy: we only recursively fetch inputs that are
- not in the lockfile yet. */
-static std::pair<Flake, FlakeInput> updateLocks(
- EvalState & state,
- const Flake & flake,
- HandleLockFile handleLockFile,
- const FlakeInputs & oldEntry,
- bool topRef)
-{
- FlakeInput newEntry(
- flake.id,
- flake.sourceInfo.resolvedRef,
- flake.sourceInfo.narHash);
-
- for (auto & input : flake.nonFlakeInputs) {
- auto & id = input.first;
- auto & ref = input.second;
- auto i = oldEntry.nonFlakeInputs.find(id);
- if (i != oldEntry.nonFlakeInputs.end()) {
- newEntry.nonFlakeInputs.insert_or_assign(i->first, i->second);
- } else {
- if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
- throw Error("cannot update non-flake dependency '%s' in pure mode", id);
- auto nonFlake = getNonFlake(state, ref, allowedToUseRegistries(handleLockFile, false));
- newEntry.nonFlakeInputs.insert_or_assign(id,
- NonFlakeInput(
- nonFlake.sourceInfo.resolvedRef,
- nonFlake.sourceInfo.narHash));
- }
- }
-
- for (auto & inputRef : flake.inputs) {
- auto i = oldEntry.flakeInputs.find(inputRef);
- if (i != oldEntry.flakeInputs.end()) {
- newEntry.flakeInputs.insert_or_assign(inputRef, i->second);
- } else {
- if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
- throw Error("cannot update flake dependency '%s' in pure mode", inputRef);
- newEntry.flakeInputs.insert_or_assign(inputRef,
- updateLocks(state,
- getFlake(state, inputRef, allowedToUseRegistries(handleLockFile, false)),
- handleLockFile, {}, false).second);
- }
- }
-
- return {flake, newEntry};
-}
-
-/* Compute an in-memory lockfile for the specified top-level flake,
- and optionally write it to file, it the flake is writable. */
-ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLockFile handleLockFile)
-{
- auto flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
-
- LockFile oldLockFile;
-
- if (!recreateLockFile(handleLockFile)) {
- // If recreateLockFile, start with an empty lockfile
- // FIXME: symlink attack
- oldLockFile = LockFile::read(
- state.store->toRealPath(flake.sourceInfo.storePath)
- + "/" + flake.sourceInfo.resolvedRef.subdir + "/flake.lock");
- }
-
- LockFile lockFile(updateLocks(
- state, flake, handleLockFile, oldLockFile, true).second);
-
- if (!(lockFile == oldLockFile)) {
- if (allowedToWrite(handleLockFile)) {
- if (auto refData = std::get_if<FlakeRef::IsPath>(&topRef.data)) {
- lockFile.write(refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
-
- // Hack: Make sure that flake.lock is visible to Git, so it ends up in the Nix store.
- runProgram("git", true, { "-C", refData->path, "add",
- (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock" });
- } else
- warn("cannot write lockfile of remote flake '%s'", topRef);
- } else if (handleLockFile != AllPure && handleLockFile != TopRefUsesRegistries)
- warn("using updated lockfile without writing it to file");
- }
-
- return ResolvedFlake(std::move(flake), std::move(lockFile));
-}
-
-void updateLockFile(EvalState & state, const FlakeRef & flakeRef, bool recreateLockFile)
-{
- resolveFlake(state, flakeRef, recreateLockFile ? RecreateLockFile : UpdateLockFile);
-}
-
-static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo, Value & vAttrs)
-{
- auto & path = sourceInfo.storePath;
- assert(state.store->isValidPath(path));
- mkString(*state.allocAttr(vAttrs, state.sOutPath), path, {path});
-
- if (sourceInfo.resolvedRef.rev) {
- mkString(*state.allocAttr(vAttrs, state.symbols.create("rev")),
- sourceInfo.resolvedRef.rev->gitRev());
- mkString(*state.allocAttr(vAttrs, state.symbols.create("shortRev")),
- sourceInfo.resolvedRef.rev->gitShortRev());
- }
-
- if (sourceInfo.revCount)
- mkInt(*state.allocAttr(vAttrs, state.symbols.create("revCount")), *sourceInfo.revCount);
-
- if (sourceInfo.lastModified)
- mkString(*state.allocAttr(vAttrs, state.symbols.create("lastModified")),
- fmt("%s",
- std::put_time(std::gmtime(&*sourceInfo.lastModified), "%Y%m%d%H%M%S")));
-}
-
-/* Helper primop to make callFlake (below) fetch/call its inputs
- lazily. Note that this primop cannot be called by user code since
- it doesn't appear in 'builtins'. */
-static void prim_callFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
-{
- auto lazyFlake = (FlakeInput *) args[0]->attrs;
- auto flake = getFlake(state, lazyFlake->ref, false);
-
- if (flake.sourceInfo.narHash != lazyFlake->narHash)
- throw Error("the content hash of flake '%s' doesn't match the hash recorded in the referring lockfile", flake.sourceInfo.resolvedRef);
-
- callFlake(state, flake, *lazyFlake, v);
-}
-
-static void prim_callNonFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
-{
- auto lazyNonFlake = (NonFlakeInput *) args[0]->attrs;
-
- auto nonFlake = getNonFlake(state, lazyNonFlake->ref);
-
- if (nonFlake.sourceInfo.narHash != lazyNonFlake->narHash)
- throw Error("the content hash of repository '%s' doesn't match the hash recorded in the referring lockfile", nonFlake.sourceInfo.resolvedRef);
-
- state.mkAttrs(v, 8);
-
- assert(state.store->isValidPath(nonFlake.sourceInfo.storePath));
-
- mkString(*state.allocAttr(v, state.sOutPath),
- nonFlake.sourceInfo.storePath, {nonFlake.sourceInfo.storePath});
-
- emitSourceInfoAttrs(state, nonFlake.sourceInfo, v);
-}
-
-void callFlake(EvalState & state,
- const Flake & flake,
- const FlakeInputs & inputs,
- Value & vRes)
-{
- // Construct the resulting attrset '{outputs, ...}'. This attrset
- // is passed lazily as an argument to the 'outputs' function.
-
- auto & v = *state.allocValue();
-
- state.mkAttrs(v,
- inputs.flakeInputs.size() +
- inputs.nonFlakeInputs.size() + 8);
-
- for (auto & dep : inputs.flakeInputs) {
- auto vFlake = state.allocAttr(v, dep.second.id);
- auto vPrimOp = state.allocValue();
- static auto primOp = new PrimOp(prim_callFlake, 1, state.symbols.create("callFlake"));
- vPrimOp->type = tPrimOp;
- vPrimOp->primOp = primOp;
- auto vArg = state.allocValue();
- vArg->type = tNull;
- // FIXME: leak
- vArg->attrs = (Bindings *) new FlakeInput(dep.second); // evil! also inefficient
- mkApp(*vFlake, *vPrimOp, *vArg);
- }
-
- for (auto & dep : inputs.nonFlakeInputs) {
- auto vNonFlake = state.allocAttr(v, dep.first);
- auto vPrimOp = state.allocValue();
- static auto primOp = new PrimOp(prim_callNonFlake, 1, state.symbols.create("callNonFlake"));
- vPrimOp->type = tPrimOp;
- vPrimOp->primOp = primOp;
- auto vArg = state.allocValue();
- vArg->type = tNull;
- // FIXME: leak
- vArg->attrs = (Bindings *) new NonFlakeInput(dep.second); // evil! also inefficient
- mkApp(*vNonFlake, *vPrimOp, *vArg);
- }
-
- mkString(*state.allocAttr(v, state.sDescription), flake.description);
-
- emitSourceInfoAttrs(state, flake.sourceInfo, v);
-
- auto vOutputs = state.allocAttr(v, state.symbols.create("outputs"));
- mkApp(*vOutputs, *flake.vOutputs, v);
-
- v.attrs->push_back(Attr(state.symbols.create("self"), &v));
-
- v.attrs->sort();
-
- /* For convenience, put the outputs directly in the result, so you
- can refer to an output of an input as 'inputs.foo.bar' rather
- than 'inputs.foo.outputs.bar'. */
- auto v2 = *state.allocValue();
- state.eval(state.parseExprFromString("res: res.outputs // res", "/"), v2);
-
- state.callFunction(v2, v, vRes, noPos);
-}
-
-void callFlake(EvalState & state,
- const ResolvedFlake & resFlake,
- Value & v)
-{
- callFlake(state, resFlake.flake, resFlake.lockFile, v);
-}
-
-// This function is exposed to be used in nix files.
-static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
-{
- callFlake(state, resolveFlake(state, state.forceStringNoCtx(*args[0], pos),
- evalSettings.pureEval ? AllPure : UseUpdatedLockFile), v);
-}
-
-static RegisterPrimOp r2("getFlake", 1, prim_getFlake);
-
-void gitCloneFlake(FlakeRef flakeRef, EvalState & state, Registries registries, const Path & destDir)
-{
- flakeRef = lookupFlake(state, flakeRef, registries);
-
- std::string uri;
-
- Strings args = {"clone"};
-
- if (auto refData = std::get_if<FlakeRef::IsGitHub>(&flakeRef.data)) {
- uri = "git@github.com:" + refData->owner + "/" + refData->repo + ".git";
- args.push_back(uri);
- if (flakeRef.ref) {
- args.push_back("--branch");
- args.push_back(*flakeRef.ref);
- }
- } else if (auto refData = std::get_if<FlakeRef::IsGit>(&flakeRef.data)) {
- args.push_back(refData->uri);
- if (flakeRef.ref) {
- args.push_back("--branch");
- args.push_back(*flakeRef.ref);
- }
- }
-
- if (destDir != "")
- args.push_back(destDir);
-
- runProgram("git", true, args);
-}
-
-}
-
-std::shared_ptr<flake::FlakeRegistry> EvalState::getGlobalFlakeRegistry()
-{
- std::call_once(_globalFlakeRegistryInit, [&]() {
- auto path = evalSettings.flakeRegistry;
-
- if (!hasPrefix(path, "/")) {
- CachedDownloadRequest request(evalSettings.flakeRegistry);
- request.name = "flake-registry.json";
- request.gcRoot = true;
- path = getDownloader()->downloadCached(store, request).path;
- }
-
- _globalFlakeRegistry = readRegistry(path);
- });
-
- return _globalFlakeRegistry;
-}
-
-// This always returns a vector with flakeReg, userReg, globalReg.
-// If one of them doesn't exist, the registry is left empty but does exist.
-const Registries EvalState::getFlakeRegistries()
-{
- Registries registries;
- registries.push_back(getFlagRegistry(registryOverrides));
- registries.push_back(getUserRegistry());
- registries.push_back(getGlobalFlakeRegistry());
- return registries;
-}
-
-}