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Merge pull request #7609 from obsidiansystems/hide-experimental-settings

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Hide experimental settings
This commit is contained in:
John Ericson 2023-03-27 09:19:29 -04:00 committed by GitHub
parent 2523448bad 4607ac7aed
commit 570829d67e
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GPG key ID: 4AEE18F83AFDEB23
34 changed files with 223 additions and 101 deletions
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4
src/build-remote/build-remote.cc
View file

@ -305,7 +305,7 @@ connected:
std::set<Realisation> missingRealisations;
StorePathSet missingPaths;
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations) && !drv.type().hasKnownOutputPaths()) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations) && !drv.type().hasKnownOutputPaths()) {
for (auto & outputName : wantedOutputs) {
auto thisOutputHash = outputHashes.at(outputName);
auto thisOutputId = DrvOutput{ thisOutputHash, outputName };
@ -337,7 +337,7 @@ connected:
for (auto & realisation : missingRealisations) {
// Should hold, because if the feature isn't enabled the set
// of missing realisations should be empty
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
store->registerDrvOutput(realisation);
}

2
src/libcmd/common-eval-args.cc
View file

@ -166,7 +166,7 @@ Path lookupFileArg(EvalState & state, std::string_view s)
}
else if (hasPrefix(s, "flake:")) {
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
auto flakeRef = parseFlakeRef(std::string(s.substr(6)), {}, true, false);
auto storePath = flakeRef.resolve(state.store).fetchTree(state.store).first.storePath;
return state.store->toRealPath(storePath);

2
src/libcmd/installables.cc
View file

@ -332,7 +332,7 @@ void completeFlakeRefWithFragment(
void completeFlakeRef(ref<Store> store, std::string_view prefix)
{
if (!settings.isExperimentalFeatureEnabled(Xp::Flakes))
if (!experimentalFeatureSettings.isEnabled(Xp::Flakes))
return;
if (prefix == "")

2
src/libexpr/flake/flake.cc
View file

@ -320,7 +320,7 @@ LockedFlake lockFlake(
const FlakeRef & topRef,
const LockFlags & lockFlags)
{
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
FlakeCache flakeCache;

4
src/libexpr/parser.y
View file

@ -469,7 +469,7 @@ expr_simple
new ExprString(std::move(path))});
}
| URI {
static bool noURLLiterals = settings.isExperimentalFeatureEnabled(Xp::NoUrlLiterals);
static bool noURLLiterals = experimentalFeatureSettings.isEnabled(Xp::NoUrlLiterals);
if (noURLLiterals)
throw ParseError({
.msg = hintfmt("URL literals are disabled"),
@ -816,7 +816,7 @@ std::pair<bool, std::string> EvalState::resolveSearchPathElem(const SearchPathEl
}
else if (hasPrefix(elem.second, "flake:")) {
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
auto flakeRef = parseFlakeRef(elem.second.substr(6), {}, true, false);
debug("fetching flake search path element '%s''", elem.second);
auto storePath = flakeRef.resolve(store).fetchTree(store).first.storePath;

6
src/libexpr/primops.cc
View file

@ -1141,13 +1141,13 @@ drvName, Bindings * attrs, Value & v)
if (i->name == state.sContentAddressed) {
contentAddressed = state.forceBool(*i->value, noPos, context_below);
if (contentAddressed)
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
}
else if (i->name == state.sImpure) {
isImpure = state.forceBool(*i->value, noPos, context_below);
if (isImpure)
settings.requireExperimentalFeature(Xp::ImpureDerivations);
experimentalFeatureSettings.require(Xp::ImpureDerivations);
}
/* The `args' attribute is special: it supplies the
@ -4114,7 +4114,7 @@ void EvalState::createBaseEnv()
if (RegisterPrimOp::primOps)
for (auto & primOp : *RegisterPrimOp::primOps)
if (!primOp.experimentalFeature
|| settings.isExperimentalFeatureEnabled(*primOp.experimentalFeature))
|| experimentalFeatureSettings.isEnabled(*primOp.experimentalFeature))
{
addPrimOp({
.fun = primOp.fun,

2
src/libexpr/primops/fetchTree.cc
View file

@ -190,7 +190,7 @@ static void fetchTree(
static void prim_fetchTree(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
fetchTree(state, pos, args, v, std::nullopt, FetchTreeParams { .allowNameArgument = false });
}

12
src/libfetchers/fetch-settings.hh
View file

@ -75,21 +75,25 @@ struct FetchSettings : public Config
Path or URI of the global flake registry.
When empty, disables the global flake registry.
)"};
)",
{}, true, Xp::Flakes};
Setting<bool> useRegistries{this, true, "use-registries",
"Whether to use flake registries to resolve flake references."};
"Whether to use flake registries to resolve flake references.",
{}, true, Xp::Flakes};
Setting<bool> acceptFlakeConfig{this, false, "accept-flake-config",
"Whether to accept nix configuration from a flake without prompting."};
"Whether to accept nix configuration from a flake without prompting.",
{}, true, Xp::Flakes};
Setting<std::string> commitLockFileSummary{
this, "", "commit-lockfile-summary",
R"(
The commit summary to use when committing changed flake lock files. If
empty, the summary is generated based on the action performed.
)"};
)",
{}, true, Xp::Flakes};
};
// FIXME: don't use a global variable.

12
src/libstore/build/derivation-goal.cc
View file

@ -199,10 +199,10 @@ void DerivationGoal::haveDerivation()
parsedDrv = std::make_unique<ParsedDerivation>(drvPath, *drv);
if (!drv->type().hasKnownOutputPaths())
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
if (!drv->type().isPure()) {
settings.requireExperimentalFeature(Xp::ImpureDerivations);
experimentalFeatureSettings.require(Xp::ImpureDerivations);
for (auto & [outputName, output] : drv->outputs) {
auto randomPath = StorePath::random(outputPathName(drv->name, outputName));
@ -336,7 +336,7 @@ void DerivationGoal::gaveUpOnSubstitution()
for (auto & i : dynamic_cast<Derivation *>(drv.get())->inputDrvs) {
/* Ensure that pure, non-fixed-output derivations don't
depend on impure derivations. */
if (settings.isExperimentalFeatureEnabled(Xp::ImpureDerivations) && drv->type().isPure() && !drv->type().isFixed()) {
if (experimentalFeatureSettings.isEnabled(Xp::ImpureDerivations) && drv->type().isPure() && !drv->type().isFixed()) {
auto inputDrv = worker.evalStore.readDerivation(i.first);
if (!inputDrv.type().isPure())
throw Error("pure derivation '%s' depends on impure derivation '%s'",
@ -477,7 +477,7 @@ void DerivationGoal::inputsRealised()
ca.fixed
/* Can optionally resolve if fixed, which is good
for avoiding unnecessary rebuilds. */
? settings.isExperimentalFeatureEnabled(Xp::CaDerivations)
? experimentalFeatureSettings.isEnabled(Xp::CaDerivations)
/* Must resolve if floating and there are any inputs
drvs. */
: true);
@ -488,7 +488,7 @@ void DerivationGoal::inputsRealised()
}, drvType.raw());
if (resolveDrv && !fullDrv.inputDrvs.empty()) {
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
/* We are be able to resolve this derivation based on the
now-known results of dependencies. If so, we become a
@ -1352,7 +1352,7 @@ std::pair<bool, DrvOutputs> DerivationGoal::checkPathValidity()
};
}
auto drvOutput = DrvOutput{info.outputHash, i.first};
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
if (auto real = worker.store.queryRealisation(drvOutput)) {
info.known = {
.path = real->outPath,

8
src/libstore/build/local-derivation-goal.cc
View file

@ -413,7 +413,7 @@ void LocalDerivationGoal::startBuilder()
)
{
#if __linux__
settings.requireExperimentalFeature(Xp::Cgroups);
experimentalFeatureSettings.require(Xp::Cgroups);
auto cgroupFS = getCgroupFS();
if (!cgroupFS)
@ -1420,7 +1420,7 @@ struct RestrictedStore : public virtual RestrictedStoreConfig, public virtual Lo
void LocalDerivationGoal::startDaemon()
{
settings.requireExperimentalFeature(Xp::RecursiveNix);
experimentalFeatureSettings.require(Xp::RecursiveNix);
Store::Params params;
params["path-info-cache-size"] = "0";
@ -2280,7 +2280,7 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
bool discardReferences = false;
if (auto structuredAttrs = parsedDrv->getStructuredAttrs()) {
if (auto udr = get(*structuredAttrs, "unsafeDiscardReferences")) {
settings.requireExperimentalFeature(Xp::DiscardReferences);
experimentalFeatureSettings.require(Xp::DiscardReferences);
if (auto output = get(*udr, outputName)) {
if (!output->is_boolean())
throw Error("attribute 'unsafeDiscardReferences.\"%s\"' of derivation '%s' must be a Boolean", outputName, drvPath.to_string());
@ -2700,7 +2700,7 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
},
.outPath = newInfo.path
};
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)
&& drv->type().isPure())
{
signRealisation(thisRealisation);

4
src/libstore/daemon.cc
View file

@ -231,10 +231,10 @@ struct ClientSettings
try {
if (name == "ssh-auth-sock") // obsolete
;
else if (name == settings.experimentalFeatures.name) {
else if (name == experimentalFeatureSettings.experimentalFeatures.name) {
// We don’t want to forward the experimental features to
// the daemon, as that could cause some pretty weird stuff
if (parseFeatures(tokenizeString<StringSet>(value)) != settings.experimentalFeatures.get())
if (parseFeatures(tokenizeString<StringSet>(value)) != experimentalFeatureSettings.experimentalFeatures.get())
debug("Ignoring the client-specified experimental features");
} else if (name == settings.pluginFiles.name) {
if (tokenizeString<Paths>(value) != settings.pluginFiles.get())

4
src/libstore/derivations.cc
View file

@ -221,7 +221,7 @@ static DerivationOutput parseDerivationOutput(const Store & store,
}
const auto hashType = parseHashType(hashAlgo);
if (hash == "impure") {
settings.requireExperimentalFeature(Xp::ImpureDerivations);
experimentalFeatureSettings.require(Xp::ImpureDerivations);
assert(pathS == "");
return DerivationOutput::Impure {
.method = std::move(method),
@ -236,7 +236,7 @@ static DerivationOutput parseDerivationOutput(const Store & store,
},
};
} else {
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
assert(pathS == "");
return DerivationOutput::CAFloating {
.method = std::move(method),

2
src/libstore/derived-path.cc
View file

@ -105,7 +105,7 @@ RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
auto drvHashes =
staticOutputHashes(store, store.readDerivation(p.drvPath));
for (auto& [outputName, outputPath] : p.outputs) {
if (settings.isExperimentalFeatureEnabled(
if (experimentalFeatureSettings.isEnabled(
Xp::CaDerivations)) {
auto drvOutput = get(drvHashes, outputName);
if (!drvOutput)

12
src/libstore/globals.cc
View file

@ -166,18 +166,6 @@ StringSet Settings::getDefaultExtraPlatforms()
return extraPlatforms;
}
bool Settings::isExperimentalFeatureEnabled(const ExperimentalFeature & feature)
{
auto & f = experimentalFeatures.get();
return std::find(f.begin(), f.end(), feature) != f.end();
}
void Settings::requireExperimentalFeature(const ExperimentalFeature & feature)
{
if (!isExperimentalFeatureEnabled(feature))
throw MissingExperimentalFeature(feature);
}
bool Settings::isWSL1()
{
struct utsname utsbuf;

8
src/libstore/globals.hh
View file

@ -3,7 +3,6 @@
#include "types.hh"
#include "config.hh"
#include "util.hh"
#include "experimental-features.hh"
#include <map>
#include <limits>
@ -932,13 +931,6 @@ public:
are loaded as plugins (non-recursively).
)"};
Setting<std::set<ExperimentalFeature>> experimentalFeatures{this, {}, "experimental-features",
"Experimental Nix features to enable."};
bool isExperimentalFeatureEnabled(const ExperimentalFeature &);
void requireExperimentalFeature(const ExperimentalFeature &);
Setting<size_t> narBufferSize{this, 32 * 1024 * 1024, "nar-buffer-size",
"Maximum size of NARs before spilling them to disk."};

10
src/libstore/local-store.cc
View file

@ -336,7 +336,7 @@ LocalStore::LocalStore(const Params & params)
else openDB(*state, false);
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
migrateCASchema(state->db, dbDir + "/ca-schema", globalLock);
}
@ -366,7 +366,7 @@ LocalStore::LocalStore(const Params & params)
state->stmts->QueryPathFromHashPart.create(state->db,
"select path from ValidPaths where path >= ? limit 1;");
state->stmts->QueryValidPaths.create(state->db, "select path from ValidPaths");
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
state->stmts->RegisterRealisedOutput.create(state->db,
R"(
insert into Realisations (drvPath, outputName, outputPath, signatures)
@ -754,7 +754,7 @@ void LocalStore::checkDerivationOutputs(const StorePath & drvPath, const Derivat
void LocalStore::registerDrvOutput(const Realisation & info, CheckSigsFlag checkSigs)
{
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
if (checkSigs == NoCheckSigs || !realisationIsUntrusted(info))
registerDrvOutput(info);
else
@ -763,7 +763,7 @@ void LocalStore::registerDrvOutput(const Realisation & info, CheckSigsFlag check
void LocalStore::registerDrvOutput(const Realisation & info)
{
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
retrySQLite<void>([&]() {
auto state(_state.lock());
if (auto oldR = queryRealisation_(*state, info.id)) {
@ -1052,7 +1052,7 @@ LocalStore::queryPartialDerivationOutputMap(const StorePath & path_)
return outputs;
});
if (!settings.isExperimentalFeatureEnabled(Xp::CaDerivations))
if (!experimentalFeatureSettings.isEnabled(Xp::CaDerivations))
return outputs;
auto drv = readInvalidDerivation(path);

2
src/libstore/lock.cc
View file

@ -129,7 +129,7 @@ struct AutoUserLock : UserLock
useUserNamespace = false;
#endif
settings.requireExperimentalFeature(Xp::AutoAllocateUids);
experimentalFeatureSettings.require(Xp::AutoAllocateUids);
assert(settings.startId > 0);
assert(settings.uidCount % maxIdsPerBuild == 0);
assert((uint64_t) settings.startId + (uint64_t) settings.uidCount <= std::numeric_limits<uid_t>::max());

2
src/libstore/misc.cc
View file

@ -326,7 +326,7 @@ OutputPathMap resolveDerivedPath(Store & store, const DerivedPath::Built & bfd,
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store.printStorePath(bfd.drvPath), output);
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
DrvOutput outputId { *outputHash, output };
auto realisation = store.queryRealisation(outputId);
if (!realisation)

4
src/libstore/remote-store.cc
View file

@ -265,7 +265,7 @@ void RemoteStore::setOptions(Connection & conn)
overrides.erase(settings.buildCores.name);
overrides.erase(settings.useSubstitutes.name);
overrides.erase(loggerSettings.showTrace.name);
overrides.erase(settings.experimentalFeatures.name);
overrides.erase(experimentalFeatureSettings.experimentalFeatures.name);
overrides.erase(settings.pluginFiles.name);
conn.to << overrides.size();
for (auto & i : overrides)
@ -876,7 +876,7 @@ std::vector<BuildResult> RemoteStore::buildPathsWithResults(
"the derivation '%s' doesn't have an output named '%s'",
printStorePath(bfd.drvPath), output);
auto outputId = DrvOutput{ *outputHash, output };
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
auto realisation =
queryRealisation(outputId);
if (!realisation)

8
src/libstore/store-api.cc
View file

@ -445,10 +445,10 @@ StringSet StoreConfig::getDefaultSystemFeatures()
{
auto res = settings.systemFeatures.get();
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations))
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations))
res.insert("ca-derivations");
if (settings.isExperimentalFeatureEnabled(Xp::RecursiveNix))
if (experimentalFeatureSettings.isEnabled(Xp::RecursiveNix))
res.insert("recursive-nix");
return res;
@ -1017,7 +1017,7 @@ std::map<StorePath, StorePath> copyPaths(
for (auto & path : paths) {
storePaths.insert(path.path());
if (auto realisation = std::get_if<Realisation>(&path.raw)) {
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
toplevelRealisations.insert(*realisation);
}
}
@ -1250,7 +1250,7 @@ std::optional<StorePath> Store::getBuildDerivationPath(const StorePath & path)
}
}
if (!settings.isExperimentalFeatureEnabled(Xp::CaDerivations) || !isValidPath(path))
if (!experimentalFeatureSettings.isEnabled(Xp::CaDerivations) || !isValidPath(path))
return path;
auto drv = readDerivation(path);

25
src/libutil/args.cc
View file

@ -52,7 +52,7 @@ std::shared_ptr<Completions> completions;
std::string completionMarker = "___COMPLETE___";
std::optional<std::string> needsCompletion(std::string_view s)
static std::optional<std::string> needsCompletion(std::string_view s)
{
if (!completions) return {};
auto i = s.find(completionMarker);
@ -120,6 +120,12 @@ void Args::parseCmdline(const Strings & _cmdline)
if (!argsSeen)
initialFlagsProcessed();
/* Now that we are done parsing, make sure that any experimental
* feature required by the flags is enabled */
for (auto & f : flagExperimentalFeatures)
experimentalFeatureSettings.require(f);
}
bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
@ -128,12 +134,18 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
auto process = [&](const std::string & name, const Flag & flag) -> bool {
++pos;
if (auto & f = flag.experimentalFeature)
flagExperimentalFeatures.insert(*f);
std::vector<std::string> args;
bool anyCompleted = false;
for (size_t n = 0 ; n < flag.handler.arity; ++n) {
if (pos == end) {
if (flag.handler.arity == ArityAny || anyCompleted) break;
throw UsageError("flag '%s' requires %d argument(s)", name, flag.handler.arity);
throw UsageError(
"flag '%s' requires %d argument(s), but only %d were given",
name, flag.handler.arity, n);
}
if (auto prefix = needsCompletion(*pos)) {
anyCompleted = true;
@ -152,7 +164,11 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
for (auto & [name, flag] : longFlags) {
if (!hiddenCategories.count(flag->category)
&& hasPrefix(name, std::string(*prefix, 2)))
{
if (auto & f = flag->experimentalFeature)
flagExperimentalFeatures.insert(*f);
completions->add("--" + name, flag->description);
}
}
return false;
}
@ -172,7 +188,8 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
if (prefix == "-") {
completions->add("--");
for (auto & [flagName, flag] : shortFlags)
completions->add(std::string("-") + flagName, flag->description);
if (experimentalFeatureSettings.isEnabled(flag->experimentalFeature))
completions->add(std::string("-") + flagName, flag->description);
}
}
@ -219,6 +236,8 @@ nlohmann::json Args::toJSON()
auto flags = nlohmann::json::object();
for (auto & [name, flag] : longFlags) {
/* Skip experimental flags when listing flags. */
if (!experimentalFeatureSettings.isEnabled(flag->experimentalFeature)) continue;
auto j = nlohmann::json::object();
if (flag->aliases.count(name)) continue;
if (flag->shortName)

14
src/libutil/args.hh
View file

@ -117,6 +117,8 @@ protected:
Handler handler;
std::function<void(size_t, std::string_view)> completer;
std::optional<ExperimentalFeature> experimentalFeature;
static Flag mkHashTypeFlag(std::string && longName, HashType * ht);
static Flag mkHashTypeOptFlag(std::string && longName, std::optional<HashType> * oht);
};
@ -188,6 +190,16 @@ public:
friend class MultiCommand;
MultiCommand * parent = nullptr;
private:
/**
* Experimental features needed when parsing args. These are checked
* after flag parsing is completed in order to support enabling
* experimental features coming after the flag that needs the
* experimental feature.
*/
std::set<ExperimentalFeature> flagExperimentalFeatures;
};
/* A command is an argument parser that can be executed by calling its
@ -253,8 +265,6 @@ enum CompletionType {
};
extern CompletionType completionType;
std::optional<std::string> needsCompletion(std::string_view s);
void completePath(size_t, std::string_view prefix);
void completeDir(size_t, std::string_view prefix);

63
src/libutil/config.cc
View file

@ -70,10 +70,17 @@ void AbstractConfig::reapplyUnknownSettings()
set(s.first, s.second);
}
// Whether we should process the option. Excludes aliases, which are handled elsewhere, and disabled features.
static bool applicable(const Config::SettingData & sd)
{
return !sd.isAlias
&& experimentalFeatureSettings.isEnabled(sd.setting->experimentalFeature);
}
void Config::getSettings(std::map<std::string, SettingInfo> & res, bool overriddenOnly)
{
for (auto & opt : _settings)
if (!opt.second.isAlias && (!overriddenOnly || opt.second.setting->overridden))
if (applicable(opt.second) && (!overriddenOnly || opt.second.setting->overridden))
res.emplace(opt.first, SettingInfo{opt.second.setting->to_string(), opt.second.setting->description});
}
@ -147,9 +154,8 @@ nlohmann::json Config::toJSON()
{
auto res = nlohmann::json::object();
for (auto & s : _settings)
if (!s.second.isAlias) {
if (applicable(s.second))
res.emplace(s.first, s.second.setting->toJSON());
}
return res;
}
@ -157,24 +163,31 @@ std::string Config::toKeyValue()
{
auto res = std::string();
for (auto & s : _settings)
if (!s.second.isAlias) {
if (applicable(s.second))
res += fmt("%s = %s\n", s.first, s.second.setting->to_string());
}
return res;
}
void Config::convertToArgs(Args & args, const std::string & category)
{
for (auto & s : _settings)
for (auto & s : _settings) {
/* We do include args for settings gated on disabled
experimental-features. The args themselves however will also be
gated on any experimental feature the underlying setting is. */
if (!s.second.isAlias)
s.second.setting->convertToArg(args, category);
}
}
AbstractSetting::AbstractSetting(
const std::string & name,
const std::string & description,
const std::set<std::string> & aliases)
: name(name), description(stripIndentation(description)), aliases(aliases)
const std::set<std::string> & aliases,
std::optional<ExperimentalFeature> experimentalFeature)
: name(name)
, description(stripIndentation(description))
, aliases(aliases)
, experimentalFeature(experimentalFeature)
{
}
@ -210,6 +223,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
.category = category,
.labels = {"value"},
.handler = {[this](std::string s) { overridden = true; set(s); }},
.experimentalFeature = experimentalFeature,
});
if (isAppendable())
@ -219,6 +233,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
.category = category,
.labels = {"value"},
.handler = {[this](std::string s) { overridden = true; set(s, true); }},
.experimentalFeature = experimentalFeature,
});
}
@ -270,13 +285,15 @@ template<> void BaseSetting<bool>::convertToArg(Args & args, const std::string &
.longName = name,
.description = fmt("Enable the `%s` setting.", name),
.category = category,
.handler = {[this]() { override(true); }}
.handler = {[this]() { override(true); }},
.experimentalFeature = experimentalFeature,
});
args.addFlag({
.longName = "no-" + name,
.description = fmt("Disable the `%s` setting.", name),
.category = category,
.handler = {[this]() { override(false); }}
.handler = {[this]() { override(false); }},
.experimentalFeature = experimentalFeature,
});
}
@ -444,4 +461,30 @@ GlobalConfig::Register::Register(Config * config)
configRegistrations->emplace_back(config);
}
ExperimentalFeatureSettings experimentalFeatureSettings;
static GlobalConfig::Register rSettings(&experimentalFeatureSettings);
bool ExperimentalFeatureSettings::isEnabled(const ExperimentalFeature & feature) const
{
auto & f = experimentalFeatures.get();
return std::find(f.begin(), f.end(), feature) != f.end();
}
void ExperimentalFeatureSettings::require(const ExperimentalFeature & feature) const
{
if (!isEnabled(feature))
throw MissingExperimentalFeature(feature);
}
bool ExperimentalFeatureSettings::isEnabled(const std::optional<ExperimentalFeature> & feature) const
{
return !feature || isEnabled(*feature);
}
void ExperimentalFeatureSettings::require(const std::optional<ExperimentalFeature> & feature) const
{
if (feature) require(*feature);
}
}

55
src/libutil/config.hh
View file

@ -1,12 +1,13 @@
#pragma once
#include <cassert>
#include <map>
#include <set>
#include "types.hh"
#include <nlohmann/json_fwd.hpp>
#pragma once
#include "types.hh"
#include "experimental-features.hh"
namespace nix {
@ -194,12 +195,15 @@ public:
bool overridden = false;
std::optional<ExperimentalFeature> experimentalFeature;
protected:
AbstractSetting(
const std::string & name,
const std::string & description,
const std::set<std::string> & aliases);
const std::set<std::string> & aliases,
std::optional<ExperimentalFeature> experimentalFeature = std::nullopt);
virtual ~AbstractSetting()
{
@ -240,8 +244,9 @@ public:
const bool documentDefault,
const std::string & name,
const std::string & description,
const std::set<std::string> & aliases = {})
: AbstractSetting(name, description, aliases)
const std::set<std::string> & aliases = {},
std::optional<ExperimentalFeature> experimentalFeature = std::nullopt)
: AbstractSetting(name, description, aliases, experimentalFeature)
, value(def)
, defaultValue(def)
, documentDefault(documentDefault)
@ -296,8 +301,9 @@ public:
const std::string & name,
const std::string & description,
const std::set<std::string> & aliases = {},
const bool documentDefault = true)
: BaseSetting<T>(def, documentDefault, name, description, aliases)
const bool documentDefault = true,
std::optional<ExperimentalFeature> experimentalFeature = std::nullopt)
: BaseSetting<T>(def, documentDefault, name, description, aliases, experimentalFeature)
{
options->addSetting(this);
}
@ -357,4 +363,37 @@ struct GlobalConfig : public AbstractConfig
extern GlobalConfig globalConfig;
struct ExperimentalFeatureSettings : Config {
Setting<std::set<ExperimentalFeature>> experimentalFeatures{this, {}, "experimental-features",
"Experimental Nix features to enable."};
/**
* Check whether the given experimental feature is enabled.
*/
bool isEnabled(const ExperimentalFeature &) const;
/**
* Require an experimental feature be enabled, throwing an error if it is
* not.
*/
void require(const ExperimentalFeature &) const;
/**
* `std::nullopt` pointer means no feature, which means there is nothing that could be
* disabled, and so the function returns true in that case.
*/
bool isEnabled(const std::optional<ExperimentalFeature> &) const;
/**
* `std::nullopt` pointer means no feature, which means there is nothing that could be
* disabled, and so the function does nothing in that case.
*/
void require(const std::optional<ExperimentalFeature> &) const;
};
// FIXME: don't use a global variable.
extern ExperimentalFeatureSettings experimentalFeatureSettings;
}

1
src/libutil/util.hh
View file

@ -450,7 +450,6 @@ template<class C> Strings quoteStrings(const C & c)
return res;
}
/* Remove trailing whitespace from a string. FIXME: return
std::string_view. */
std::string chomp(std::string_view s);

2
src/nix-build/nix-build.cc
View file

@ -440,7 +440,7 @@ static void main_nix_build(int argc, char * * argv)
shell = store->printStorePath(shellDrvOutputs.at("out").value()) + "/bin/bash";
}
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
auto resolvedDrv = drv.tryResolve(*store);
assert(resolvedDrv && "Successfully resolved the derivation");
drv = *resolvedDrv;

2
src/nix/develop.cc
View file

@ -208,7 +208,7 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
drv.name += "-env";
drv.env.emplace("name", drv.name);
drv.inputSrcs.insert(std::move(getEnvShPath));
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
for (auto & output : drv.outputs) {
output.second = DerivationOutput::Deferred {},
drv.env[output.first] = hashPlaceholder(output.first);

2
src/nix/flake.cc
View file

@ -1335,7 +1335,7 @@ struct CmdFlake : NixMultiCommand
{
if (!command)
throw UsageError("'nix flake' requires a sub-command.");
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
command->second->run();
}
};

20
src/nix/main.cc
View file

@ -54,12 +54,11 @@ static bool haveInternet()
std::string programPath;
struct HelpRequested { };
struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
{
bool useNet = true;
bool refresh = false;
bool helpRequested = false;
bool showVersion = false;
NixArgs() : MultiCommand(RegisterCommand::getCommandsFor({})), MixCommonArgs("nix")
@ -74,7 +73,7 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
.longName = "help",
.description = "Show usage information.",
.category = miscCategory,
.handler = {[&]() { throw HelpRequested(); }},
.handler = {[this]() { this->helpRequested = true; }},
});
addFlag({
@ -297,7 +296,10 @@ void mainWrapped(int argc, char * * argv)
}
if (argc == 2 && std::string(argv[1]) == "__dump-builtins") {
settings.experimentalFeatures = {Xp::Flakes, Xp::FetchClosure};
experimentalFeatureSettings.experimentalFeatures = {
Xp::Flakes,
Xp::FetchClosure,
};
evalSettings.pureEval = false;
EvalState state({}, openStore("dummy://"));
auto res = nlohmann::json::object();
@ -334,7 +336,11 @@ void mainWrapped(int argc, char * * argv)
try {
args.parseCmdline(argvToStrings(argc, argv));
} catch (HelpRequested &) {
} catch (UsageError &) {
if (!args.helpRequested && !completions) throw;
}
if (args.helpRequested) {
std::vector<std::string> subcommand;
MultiCommand * command = &args;
while (command) {
@ -346,8 +352,6 @@ void mainWrapped(int argc, char * * argv)
}
showHelp(subcommand, args);
return;
} catch (UsageError &) {
if (!completions) throw;
}
if (completions) {
@ -366,7 +370,7 @@ void mainWrapped(int argc, char * * argv)
if (args.command->first != "repl"
&& args.command->first != "doctor"
&& args.command->first != "upgrade-nix")
settings.requireExperimentalFeature(Xp::NixCommand);
experimentalFeatureSettings.require(Xp::NixCommand);
if (args.useNet && !haveInternet()) {
warn("you don't have Internet access; disabling some network-dependent features");

2
src/nix/realisation.cc
View file

@ -45,7 +45,7 @@ struct CmdRealisationInfo : BuiltPathsCommand, MixJSON
void run(ref<Store> store, BuiltPaths && paths) override
{
settings.requireExperimentalFeature(Xp::CaDerivations);
experimentalFeatureSettings.require(Xp::CaDerivations);
RealisedPath::Set realisations;
for (auto & builtPath : paths) {

2
src/nix/registry.cc
View file

@ -224,7 +224,7 @@ struct CmdRegistry : virtual NixMultiCommand
void run() override
{
settings.requireExperimentalFeature(Xp::Flakes);
experimentalFeatureSettings.require(Xp::Flakes);
if (!command)
throw UsageError("'nix registry' requires a sub-command.");
command->second->run();

2
src/nix/repl.cc
View file

@ -38,7 +38,7 @@ struct CmdRepl : RawInstallablesCommand
void applyDefaultInstallables(std::vector<std::string> & rawInstallables) override
{
if (!settings.isExperimentalFeatureEnabled(Xp::ReplFlake) && !(file) && rawInstallables.size() >= 1) {
if (!experimentalFeatureSettings.isEnabled(Xp::ReplFlake) && !(file) && rawInstallables.size() >= 1) {
warn("future versions of Nix will require using `--file` to load a file");
if (rawInstallables.size() > 1)
warn("more than one input file is not currently supported");

23
tests/experimental-features.sh Normal file
View file

@ -0,0 +1,23 @@
source common.sh
# Without flakes, flake options should not show up
# With flakes, flake options should show up
function both_ways {
nix --experimental-features 'nix-command' "$@" | grepQuietInverse flake
nix --experimental-features 'nix-command flakes' "$@" | grepQuiet flake
# Also, the order should not matter
nix "$@" --experimental-features 'nix-command' | grepQuietInverse flake
nix "$@" --experimental-features 'nix-command flakes' | grepQuiet flake
}
# Simple case, the configuration effects the running command
both_ways show-config
# Complicated case, earlier args effect later args
both_ways store gc --help
expect 1 nix --experimental-features 'nix-command' show-config --flake-registry 'https://no'
nix --experimental-features 'nix-command flakes' show-config --flake-registry 'https://no'

1
tests/local.mk
View file

@ -18,6 +18,7 @@ nix_tests = \
gc.sh \
remote-store.sh \
lang.sh \
experimental-features.sh \
fetchMercurial.sh \
gc-auto.sh \
user-envs.sh \