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Merge remote-tracking branch 'origin/master' into non-blocking-gc

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This commit is contained in:
Eelco Dolstra 2021-10-28 14:56:55 +02:00
parent a594d1afd5 bc4b7521f4
commit a7d4f3411e
39 changed files with 266 additions and 91 deletions
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6
.github/workflows/test.yml vendored
View file

@ -11,7 +11,7 @@ jobs:
runs-on: ${{ matrix.os }}
steps:
- uses: actions/checkout@v2.3.4
- uses: actions/checkout@v2.3.5
with:
fetch-depth: 0
- uses: cachix/install-nix-action@v14
@ -41,7 +41,7 @@ jobs:
outputs:
installerURL: ${{ steps.prepare-installer.outputs.installerURL }}
steps:
- uses: actions/checkout@v2.3.4
- uses: actions/checkout@v2.3.5
with:
fetch-depth: 0
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
@ -61,7 +61,7 @@ jobs:
os: [ubuntu-latest, macos-latest]
runs-on: ${{ matrix.os }}
steps:
- uses: actions/checkout@v2.3.4
- uses: actions/checkout@v2.3.5
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
- uses: cachix/install-nix-action@v14
with:

3
doc/manual/src/SUMMARY.md.in
View file

@ -70,7 +70,8 @@
- [Hacking](contributing/hacking.md)
- [CLI guideline](contributing/cli-guideline.md)
- [Release Notes](release-notes/release-notes.md)
- [Release 2.4 (2021-XX-XX)](release-notes/rl-2.4.md)
- [Release X.Y (202?-??-??)](release-notes/rl-next.md)
- [Release 2.4 (2021-11-01)](release-notes/rl-2.4.md)
- [Release 2.3 (2019-09-04)](release-notes/rl-2.3.md)
- [Release 2.2 (2019-01-11)](release-notes/rl-2.2.md)
- [Release 2.1 (2018-09-02)](release-notes/rl-2.1.md)

12
doc/manual/src/command-ref/nix-shell.md
View file

@ -110,13 +110,19 @@ shell in which to build it:
```console
$ nix-shell '<nixpkgs>' -A pan
[nix-shell]$ unpackPhase
[nix-shell]$ eval ${unpackPhase:-unpackPhase}
[nix-shell]$ cd pan-*
[nix-shell]$ configurePhase
[nix-shell]$ buildPhase
[nix-shell]$ eval ${configurePhase:-configurePhase}
[nix-shell]$ eval ${buildPhase:-buildPhase}
[nix-shell]$ ./pan/gui/pan
```
The reason we use form `eval ${configurePhase:-configurePhase}` here is because
those packages that override these phases do so by exporting the overridden
values in the environment variable of the same name.
Here bash is being told to either evaluate the contents of 'configurePhase',
if it exists as a variable, otherwise evaluate the configurePhase function.
To clear the environment first, and do some additional automatic
initialisation of the interactive shell:

33
doc/manual/src/release-notes/rl-2.4.md
View file

@ -1,4 +1,4 @@
# Release 2.4 (2021-10-XX)
# Release 2.4 (2021-11-01)
This is the first release in more than two years and is the result of
more than 2800 commits from 195 contributors since release 2.3.
@ -286,8 +286,35 @@ more than 2800 commits from 195 contributors since release 2.3.
to your `nix.conf` if you want to use it, or pass
`--extra-experimental-features nix-command` on the command line.
* The old `nix run` has been renamed to `nix shell` (and there is a
new `nix run` that does something else, as described above).
* The `nix` command no longer has a syntax for referring to packages
in a channel. This means that the following no longer works:
> nix build nixpkgs.hello # Nix 2.3
Instead, you can either use the `#` syntax to select a package from
a flake, e.g.
> nix build nixpkgs#hello
Or, if you want to use the `nixpkgs` channel in the `NIX_PATH`
environment variable:
> nix build -f '<nixpkgs>' hello
* The old `nix run` has been renamed to `nix shell`, while there is a
new `nix run` that runs a default command. So instead of
> nix run nixpkgs.hello -c hello # Nix 2.3
you should use
> nix shell nixpkgs#hello -c hello
or just
> nix run nixpkgs#hello
if the command you want to run has the same name as the package.
* It is now an error to modify the `plugin-files` setting via a
command-line flag that appears after the first non-flag argument to

0
doc/manual/src/release-notes/rl-2.5.md → doc/manual/src/release-notes/rl-next.md
View file

1
flake.nix
View file

@ -61,6 +61,7 @@
configureFlags =
lib.optionals stdenv.isLinux [
"--with-boost=${boost}/lib"
"--with-sandbox-shell=${sh}/bin/busybox"
"LDFLAGS=-fuse-ld=gold"
];

14
src/build-remote/build-remote.cc
View file

@ -18,6 +18,7 @@
#include "derivations.hh"
#include "local-store.hh"
#include "legacy.hh"
#include "experimental-features.hh"
using namespace nix;
using std::cin;
@ -130,11 +131,14 @@ static int main_build_remote(int argc, char * * argv)
for (auto & m : machines) {
debug("considering building on remote machine '%s'", m.storeUri);
if (m.enabled && std::find(m.systemTypes.begin(),
if (m.enabled
&& (neededSystem == "builtin"
|| std::find(m.systemTypes.begin(),
m.systemTypes.end(),
neededSystem) != m.systemTypes.end() &&
neededSystem) != m.systemTypes.end()) &&
m.allSupported(requiredFeatures) &&
m.mandatoryMet(requiredFeatures)) {
m.mandatoryMet(requiredFeatures))
{
rightType = true;
AutoCloseFD free;
uint64_t load = 0;
@ -295,7 +299,7 @@ connected:
std::set<Realisation> missingRealisations;
StorePathSet missingPaths;
if (settings.isExperimentalFeatureEnabled("ca-derivations") && !derivationHasKnownOutputPaths(drv.type())) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations) && !derivationHasKnownOutputPaths(drv.type())) {
for (auto & outputName : wantedOutputs) {
auto thisOutputHash = outputHashes.at(outputName);
auto thisOutputId = DrvOutput{ thisOutputHash, outputName };
@ -327,7 +331,7 @@ connected:
for (auto & realisation : missingRealisations) {
// Should hold, because if the feature isn't enabled the set
// of missing realisations should be empty
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
store->registerDrvOutput(realisation);
}

2
src/libcmd/installables.cc
View file

@ -714,7 +714,7 @@ BuiltPaths getBuiltPaths(ref<Store> evalStore, ref<Store> store, const DerivedPa
"the derivation '%s' doesn't have an output named '%s'",
store->printStorePath(bfd.drvPath), output);
if (settings.isExperimentalFeatureEnabled(
"ca-derivations")) {
Xp::CaDerivations)) {
auto outputId =
DrvOutput{outputHashes.at(output), output};
auto realisation =

2
src/libexpr/eval.cc
View file

@ -466,7 +466,7 @@ EvalState::~EvalState()
void EvalState::requireExperimentalFeatureOnEvaluation(
const std::string & feature,
const ExperimentalFeature & feature,
const std::string_view fName,
const Pos & pos)
{

3
src/libexpr/eval.hh
View file

@ -5,6 +5,7 @@
#include "nixexpr.hh"
#include "symbol-table.hh"
#include "config.hh"
#include "experimental-features.hh"
#include <map>
#include <optional>
@ -141,7 +142,7 @@ public:
~EvalState();
void requireExperimentalFeatureOnEvaluation(
const std::string & feature,
const ExperimentalFeature &,
const std::string_view fName,
const Pos & pos
);

4
src/libexpr/flake/flake.cc
View file

@ -297,7 +297,7 @@ LockedFlake lockFlake(
const FlakeRef & topRef,
const LockFlags & lockFlags)
{
settings.requireExperimentalFeature("flakes");
settings.requireExperimentalFeature(Xp::Flakes);
FlakeCache flakeCache;
@ -687,7 +687,7 @@ void callFlake(EvalState & state,
static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.requireExperimentalFeatureOnEvaluation("flakes", "builtins.getFlake", pos);
state.requireExperimentalFeatureOnEvaluation(Xp::Flakes, "builtins.getFlake", pos);
auto flakeRefS = state.forceStringNoCtx(*args[0], pos);
auto flakeRef = parseFlakeRef(flakeRefS, {}, true);

4
src/libexpr/parser.y
View file

@ -418,7 +418,7 @@ expr_simple
new ExprString(data->symbols.create(path)));
}
| URI {
static bool noURLLiterals = settings.isExperimentalFeatureEnabled("no-url-literals");
static bool noURLLiterals = settings.isExperimentalFeatureEnabled(Xp::NoUrlLiterals);
if (noURLLiterals)
throw ParseError({
.msg = hintfmt("URL literals are disabled"),
@ -752,7 +752,7 @@ std::pair<bool, std::string> EvalState::resolveSearchPathElem(const SearchPathEl
res = { true, path };
else {
logWarning({
.msg = hintfmt("warning: Nix search path entry '%1%' does not exist, ignoring", elem.second)
.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", elem.second)
});
res = { false, "" };
}

2
src/libexpr/primops.cc
View file

@ -985,7 +985,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
}
if (i->name == state.sContentAddressed) {
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
contentAddressed = state.forceBool(*i->value, pos);
}

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

@ -15,7 +15,7 @@ static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * ar
std::string name = "source";
PathSet context;
state.forceValue(*args[0]);
state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) {

18
src/libexpr/primops/fetchTree.cc
View file

@ -97,7 +97,7 @@ static void fetchTree(
fetchers::Input input;
PathSet context;
state.forceValue(*args[0]);
state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) {
state.forceAttrs(*args[0], pos);
@ -121,7 +121,7 @@ static void fetchTree(
for (auto & attr : *args[0]->attrs) {
if (attr.name == state.sType) continue;
state.forceValue(*attr.value);
state.forceValue(*attr.value, *attr.pos);
if (attr.value->type() == nPath || attr.value->type() == nString) {
auto s = state.coerceToString(*attr.pos, *attr.value, context, false, false);
attrs.emplace(attr.name,
@ -176,7 +176,7 @@ static void fetchTree(
static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
settings.requireExperimentalFeature("flakes");
settings.requireExperimentalFeature(Xp::Flakes);
fetchTree(state, pos, args, v, std::nullopt, FetchTreeParams { .allowNameArgument = false });
}
@ -189,7 +189,7 @@ static void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
std::optional<std::string> url;
std::optional<Hash> expectedHash;
state.forceValue(*args[0]);
state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) {
@ -287,11 +287,11 @@ static RegisterPrimOp primop_fetchTarball({
stdenv.mkDerivation { … }
```
The fetched tarball is cached for a certain amount of time (1 hour
by default) in `~/.cache/nix/tarballs/`. You can change the cache
timeout either on the command line with `--option tarball-ttl number
of seconds` or in the Nix configuration file with this option: `
number of seconds to cache `.
The fetched tarball is cached for a certain amount of time (1
hour by default) in `~/.cache/nix/tarballs/`. You can change the
cache timeout either on the command line with `--tarball-ttl`
*number-of-seconds* or in the Nix configuration file by adding
the line `tarball-ttl = ` *number-of-seconds*.
Note that when obtaining the hash with `nix-prefetch-url` the
option `--unpack` is required.

10
src/libstore/build/derivation-goal.cc
View file

@ -204,7 +204,7 @@ void DerivationGoal::haveDerivation()
trace("have derivation");
if (drv->type() == DerivationType::CAFloating)
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
retrySubstitution = false;
@ -453,7 +453,7 @@ void DerivationGoal::inputsRealised()
if (useDerivation) {
auto & fullDrv = *dynamic_cast<Derivation *>(drv.get());
if (settings.isExperimentalFeatureEnabled("ca-derivations") &&
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations) &&
((!fullDrv.inputDrvs.empty() && derivationIsCA(fullDrv.type()))
|| fullDrv.type() == DerivationType::DeferredInputAddressed)) {
/* We are be able to resolve this derivation based on the
@ -616,7 +616,9 @@ void DerivationGoal::tryToBuild()
/* Don't do a remote build if the derivation has the attribute
`preferLocalBuild' set. Also, check and repair modes are only
supported for local builds. */
bool buildLocally = buildMode != bmNormal || parsedDrv->willBuildLocally(worker.store);
bool buildLocally =
(buildMode != bmNormal || parsedDrv->willBuildLocally(worker.store))
&& settings.maxBuildJobs.get() != 0;
if (!buildLocally) {
switch (tryBuildHook()) {
@ -1273,7 +1275,7 @@ void DerivationGoal::checkPathValidity()
: PathStatus::Corrupt,
};
}
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
auto drvOutput = DrvOutput{initialOutputs.at(i.first).outputHash, i.first};
if (auto real = worker.store.queryRealisation(drvOutput)) {
info.known = {

2
src/libstore/build/entry-points.cc
View file

@ -74,7 +74,7 @@ BuildResult Store::buildDerivation(const StorePath & drvPath, const BasicDerivat
outputId,
Realisation{ outputId, *staticOutput.second}
);
if (settings.isExperimentalFeatureEnabled("ca-derivations") && !derivationHasKnownOutputPaths(drv.type())) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations) && !derivationHasKnownOutputPaths(drv.type())) {
auto realisation = this->queryRealisation(outputId);
if (realisation)
result.builtOutputs.insert_or_assign(

6
src/libstore/build/local-derivation-goal.cc
View file

@ -1259,7 +1259,7 @@ struct RestrictedStore : public virtual RestrictedStoreConfig, public virtual Lo
for (auto & [outputName, outputPath] : outputs)
if (wantOutput(outputName, bfd.outputs)) {
newPaths.insert(outputPath);
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
auto thisRealisation = next->queryRealisation(
DrvOutput{drvHashes.at(outputName), outputName}
);
@ -1320,7 +1320,7 @@ struct RestrictedStore : public virtual RestrictedStoreConfig, public virtual Lo
void LocalDerivationGoal::startDaemon()
{
settings.requireExperimentalFeature("recursive-nix");
settings.requireExperimentalFeature(Xp::RecursiveNix);
Store::Params params;
params["path-info-cache-size"] = "0";
@ -2561,7 +2561,7 @@ void LocalDerivationGoal::registerOutputs()
that for floating CA derivations, which otherwise couldn't be cached,
but it's fine to do in all cases. */
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
for (auto& [outputName, newInfo] : infos) {
auto thisRealisation = Realisation{
.id = DrvOutput{initialOutputs.at(outputName).outputHash,

3
src/libstore/daemon.cc
View file

@ -230,11 +230,12 @@ struct ClientSettings
else if (name == settings.experimentalFeatures.name) {
// We don’t want to forward the experimental features to
// the daemon, as that could cause some pretty weird stuff
if (tokenizeString<Strings>(value) != settings.experimentalFeatures.get())
if (parseFeatures(tokenizeString<StringSet>(value)) != settings.experimentalFeatures.get())
debug("Ignoring the client-specified experimental features");
}
else if (trusted
|| name == settings.buildTimeout.name
|| name == settings.buildRepeat.name
|| name == "connect-timeout"
|| (name == "builders" && value == ""))
settings.set(name, value);

2
src/libstore/derivations.cc
View file

@ -187,7 +187,7 @@ static DerivationOutput parseDerivationOutput(const Store & store,
},
};
} else {
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
assert(pathS == "");
return DerivationOutput {
.output = DerivationOutputCAFloating {

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

@ -100,7 +100,7 @@ RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
staticOutputHashes(store, store.readDerivation(p.drvPath));
for (auto& [outputName, outputPath] : p.outputs) {
if (settings.isExperimentalFeatureEnabled(
"ca-derivations")) {
Xp::CaDerivations)) {
auto thisRealisation = store.queryRealisation(
DrvOutput{drvHashes.at(outputName), outputName});
assert(thisRealisation); // We’ve built it, so we must h

18
src/libstore/globals.cc
View file

@ -148,7 +148,8 @@ StringSet Settings::getDefaultExtraPlatforms()
// machines. Note that we can’t force processes from executing
// x86_64 in aarch64 environments or vice versa since they can
// always exec with their own binary preferences.
if (pathExists("/Library/Apple/System/Library/LaunchDaemons/com.apple.oahd.plist")) {
if (pathExists("/Library/Apple/System/Library/LaunchDaemons/com.apple.oahd.plist") ||
pathExists("/System/Library/LaunchDaemons/com.apple.oahd.plist")) {
if (std::string{SYSTEM} == "x86_64-darwin")
extraPlatforms.insert("aarch64-darwin");
else if (std::string{SYSTEM} == "aarch64-darwin")
@ -159,21 +160,16 @@ StringSet Settings::getDefaultExtraPlatforms()
return extraPlatforms;
}
bool Settings::isExperimentalFeatureEnabled(const std::string & name)
bool Settings::isExperimentalFeatureEnabled(const ExperimentalFeature & feature)
{
auto & f = experimentalFeatures.get();
return std::find(f.begin(), f.end(), name) != f.end();
return std::find(f.begin(), f.end(), feature) != f.end();
}
MissingExperimentalFeature::MissingExperimentalFeature(std::string feature)
: Error("experimental Nix feature '%1%' is disabled; use '--extra-experimental-features %1%' to override", feature)
, missingFeature(feature)
{}
void Settings::requireExperimentalFeature(const std::string & name)
void Settings::requireExperimentalFeature(const ExperimentalFeature & feature)
{
if (!isExperimentalFeatureEnabled(name))
throw MissingExperimentalFeature(name);
if (!isExperimentalFeatureEnabled(feature))
throw MissingExperimentalFeature(feature);
}
bool Settings::isWSL1()

16
src/libstore/globals.hh
View file

@ -3,6 +3,7 @@
#include "types.hh"
#include "config.hh"
#include "util.hh"
#include "experimental-features.hh"
#include <map>
#include <limits>
@ -45,15 +46,6 @@ struct PluginFilesSetting : public BaseSetting<Paths>
void set(const std::string & str, bool append = false) override;
};
class MissingExperimentalFeature: public Error
{
public:
std::string missingFeature;
MissingExperimentalFeature(std::string feature);
virtual const char* sname() const override { return "MissingExperimentalFeature"; }
};
class Settings : public Config {
unsigned int getDefaultCores();
@ -925,12 +917,12 @@ public:
value.
)"};
Setting<Strings> experimentalFeatures{this, {}, "experimental-features",
Setting<std::set<ExperimentalFeature>> experimentalFeatures{this, {}, "experimental-features",
"Experimental Nix features to enable."};
bool isExperimentalFeatureEnabled(const std::string & name);
bool isExperimentalFeatureEnabled(const ExperimentalFeature &);
void requireExperimentalFeature(const std::string & name);
void requireExperimentalFeature(const ExperimentalFeature &);
Setting<bool> allowDirty{this, true, "allow-dirty",
"Whether to allow dirty Git/Mercurial trees."};

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

@ -308,7 +308,7 @@ LocalStore::LocalStore(const Params & params)
else openDB(*state, false);
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
migrateCASchema(state->db, dbDir + "/ca-schema", globalLock);
}
@ -338,7 +338,7 @@ 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("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
state->stmts->RegisterRealisedOutput.create(state->db,
R"(
insert into Realisations (drvPath, outputName, outputPath, signatures)
@ -717,7 +717,7 @@ void LocalStore::checkDerivationOutputs(const StorePath & drvPath, const Derivat
void LocalStore::registerDrvOutput(const Realisation & info, CheckSigsFlag checkSigs)
{
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
if (checkSigs == NoCheckSigs || !realisationIsUntrusted(info))
registerDrvOutput(info);
else
@ -726,7 +726,7 @@ void LocalStore::registerDrvOutput(const Realisation & info, CheckSigsFlag check
void LocalStore::registerDrvOutput(const Realisation & info)
{
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
retrySQLite<void>([&]() {
auto state(_state.lock());
if (auto oldR = queryRealisation_(*state, info.id)) {
@ -1012,7 +1012,7 @@ LocalStore::queryPartialDerivationOutputMap(const StorePath & path_)
return outputs;
});
if (!settings.isExperimentalFeatureEnabled("ca-derivations"))
if (!settings.isExperimentalFeatureEnabled(Xp::CaDerivations))
return outputs;
auto drv = readInvalidDerivation(path);

6
src/libstore/store-api.cc
View file

@ -355,7 +355,7 @@ ValidPathInfo Store::addToStoreSlow(std::string_view name, const Path & srcPath,
StringSet StoreConfig::getDefaultSystemFeatures()
{
auto res = settings.systemFeatures.get();
if (settings.isExperimentalFeatureEnabled("ca-derivations"))
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations))
res.insert("ca-derivations");
return res;
}
@ -854,7 +854,7 @@ std::map<StorePath, StorePath> copyPaths(
for (auto & path : paths) {
storePaths.insert(path.path());
if (auto realisation = std::get_if<Realisation>(&path.raw)) {
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
toplevelRealisations.insert(*realisation);
}
}
@ -886,7 +886,7 @@ std::map<StorePath, StorePath> copyPaths(
// Don't fail if the remote doesn't support CA derivations is it might
// not be within our control to change that, and we might still want
// to at least copy the output paths.
if (e.missingFeature == "ca-derivations")
if (e.missingFeature == Xp::CaDerivations)
ignoreException();
else
throw;

27
src/libutil/config.cc
View file

@ -1,6 +1,7 @@
#include "config.hh"
#include "args.hh"
#include "abstract-setting-to-json.hh"
#include "experimental-features.hh"
#include <nlohmann/json.hpp>
@ -313,6 +314,31 @@ template<> std::string BaseSetting<StringSet>::to_string() const
return concatStringsSep(" ", value);
}
template<> void BaseSetting<std::set<ExperimentalFeature>>::set(const std::string & str, bool append)
{
if (!append) value.clear();
for (auto & s : tokenizeString<StringSet>(str)) {
auto thisXpFeature = parseExperimentalFeature(s);
if (thisXpFeature)
value.insert(thisXpFeature.value());
else
warn("unknown experimental feature '%s'", s);
}
}
template<> bool BaseSetting<std::set<ExperimentalFeature>>::isAppendable()
{
return true;
}
template<> std::string BaseSetting<std::set<ExperimentalFeature>>::to_string() const
{
StringSet stringifiedXpFeatures;
for (auto & feature : value)
stringifiedXpFeatures.insert(std::string(showExperimentalFeature(feature)));
return concatStringsSep(" ", stringifiedXpFeatures);
}
template<> void BaseSetting<StringMap>::set(const std::string & str, bool append)
{
if (!append) value.clear();
@ -348,6 +374,7 @@ template class BaseSetting<std::string>;
template class BaseSetting<Strings>;
template class BaseSetting<StringSet>;
template class BaseSetting<StringMap>;
template class BaseSetting<std::set<ExperimentalFeature>>;
void PathSetting::set(const std::string & str, bool append)
{

59
src/libutil/experimental-features.cc Normal file
View file

@ -0,0 +1,59 @@
#include "experimental-features.hh"
#include "util.hh"
#include "nlohmann/json.hpp"
namespace nix {
std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = {
{ Xp::CaDerivations, "ca-derivations" },
{ Xp::Flakes, "flakes" },
{ Xp::NixCommand, "nix-command" },
{ Xp::RecursiveNix, "recursive-nix" },
{ Xp::NoUrlLiterals, "no-url-literals" },
};
const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name)
{
using ReverseXpMap = std::map<std::string_view, ExperimentalFeature>;
static auto reverseXpMap = []()
{
auto reverseXpMap = std::make_unique<ReverseXpMap>();
for (auto & [feature, name] : stringifiedXpFeatures)
(*reverseXpMap)[name] = feature;
return reverseXpMap;
}();
if (auto feature = get(*reverseXpMap, name))
return *feature;
else
return std::nullopt;
}
std::string_view showExperimentalFeature(const ExperimentalFeature feature)
{
return stringifiedXpFeatures.at(feature);
}
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> & rawFeatures)
{
std::set<ExperimentalFeature> res;
for (auto & rawFeature : rawFeatures) {
if (auto feature = parseExperimentalFeature(rawFeature))
res.insert(*feature);
}
return res;
}
MissingExperimentalFeature::MissingExperimentalFeature(ExperimentalFeature feature)
: Error("experimental Nix feature '%1%' is disabled; use '--extra-experimental-features %1%' to override", showExperimentalFeature(feature))
, missingFeature(feature)
{}
std::ostream & operator <<(std::ostream & str, const ExperimentalFeature & feature)
{
return str << showExperimentalFeature(feature);
}
}

56
src/libutil/experimental-features.hh Normal file
View file

@ -0,0 +1,56 @@
#pragma once
#include "comparator.hh"
#include "error.hh"
#include "nlohmann/json_fwd.hpp"
#include "types.hh"
namespace nix {
/**
* The list of available experimental features.
*
* If you update this, don’t forget to also change the map defining their
* string representation in the corresponding `.cc` file.
**/
enum struct ExperimentalFeature
{
CaDerivations,
Flakes,
NixCommand,
RecursiveNix,
NoUrlLiterals
};
/**
* Just because writing `ExperimentalFeature::CaDerivations` is way too long
*/
using Xp = ExperimentalFeature;
const std::optional<ExperimentalFeature> parseExperimentalFeature(
const std::string_view & name);
std::string_view showExperimentalFeature(const ExperimentalFeature);
std::ostream & operator<<(
std::ostream & str,
const ExperimentalFeature & feature);
/**
* Parse a set of strings to the corresponding set of experimental features,
* ignoring (but warning for) any unkwown feature.
*/
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
class MissingExperimentalFeature : public Error
{
public:
ExperimentalFeature missingFeature;
MissingExperimentalFeature(ExperimentalFeature);
virtual const char * sname() const override
{
return "MissingExperimentalFeature";
}
};
}

2
src/libutil/ref.hh
View file

@ -17,7 +17,7 @@ private:
public:
ref<T>(const ref<T> & r)
ref(const ref<T> & r)
: p(r.p)
{ }

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

@ -401,7 +401,7 @@ static void main_nix_build(int argc, char * * argv)
if (dryRun) return;
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
auto resolvedDrv = drv.tryResolve(*store);
assert(resolvedDrv && "Successfully resolved the derivation");
drv = *resolvedDrv;

2
src/nix/develop.cc
View file

@ -195,7 +195,7 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
'buildDerivation', but that's privileged. */
drv.name += "-env";
drv.inputSrcs.insert(std::move(getEnvShPath));
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
for (auto & output : drv.outputs) {
output.second = {
.output = DerivationOutputDeferred{},

2
src/nix/flake.cc
View file

@ -1138,7 +1138,7 @@ struct CmdFlake : NixMultiCommand
{
if (!command)
throw UsageError("'nix flake' requires a sub-command.");
settings.requireExperimentalFeature("flakes");
settings.requireExperimentalFeature(Xp::Flakes);
command->second->prepare();
command->second->run();
}

2
src/nix/main.cc
View file

@ -337,7 +337,7 @@ void mainWrapped(int argc, char * * argv)
if (args.command->first != "repl"
&& args.command->first != "doctor"
&& args.command->first != "upgrade-nix")
settings.requireExperimentalFeature("nix-command");
settings.requireExperimentalFeature(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

@ -46,7 +46,7 @@ struct CmdRealisationInfo : BuiltPathsCommand, MixJSON
void run(ref<Store> store, BuiltPaths && paths) override
{
settings.requireExperimentalFeature("ca-derivations");
settings.requireExperimentalFeature(Xp::CaDerivations);
RealisedPath::Set realisations;
for (auto & builtPath : paths) {

2
src/nix/sigs.cc
View file

@ -219,7 +219,7 @@ struct CmdKey : NixMultiCommand
{
if (!command)
throw UsageError("'nix flake' requires a sub-command.");
settings.requireExperimentalFeature("flakes");
settings.requireExperimentalFeature(Xp::Flakes);
command->second->prepare();
command->second->run();
}

2
tests/common.sh.in
View file

@ -126,7 +126,7 @@ isDaemonNewer () {
[[ -n "${NIX_DAEMON_PACKAGE:-}" ]] || return 0
local requiredVersion="$1"
local daemonVersion=$($NIX_DAEMON_PACKAGE/bin/nix-daemon --version | cut -d' ' -f3)
return [[ $(nix eval --expr "builtins.compareVersions ''$daemonVersion'' ''2.4''") -ge 0 ]]
[[ $(nix eval --expr "builtins.compareVersions ''$daemonVersion'' ''$requiredVersion''") -ge 0 ]]
}
requireDaemonNewerThan () {

2
tests/config.sh
View file

@ -50,4 +50,4 @@ exp_cores=$(nix show-config | grep '^cores' | cut -d '=' -f 2 | xargs)
exp_features=$(nix show-config | grep '^experimental-features' | cut -d '=' -f 2 | xargs)
[[ $prev != $exp_cores ]]
[[ $exp_cores == "4242" ]]
[[ $exp_features == "nix-command flakes" ]]
[[ $exp_features == "flakes nix-command" ]]

4
tests/eval-store.sh
View file

@ -1,6 +1,8 @@
source common.sh
requireDaemonNewerThan "2.4pre20210727"
# Using `--eval-store` with the daemon will eventually copy everything
# to the build store, invalidating most of the tests here
needLocalStore
eval_store=$TEST_ROOT/eval-store

2
tests/structured-attrs.sh
View file

@ -2,7 +2,7 @@ source common.sh
# 27ce722638 required some incompatible changes to the nix file, so skip this
# tests for the older versions
requireDaemonNewerThan "2.4pre20210622"
requireDaemonNewerThan "2.4pre20210712"
clearStore