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Make the Derived Path family of types inductive for dynamic derivations

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We want to be able to write down `foo.drv^bar.drv^baz`:
`foo.drv^bar.drv` is the dynamic derivation (since it is itself a
derivation output, `bar.drv` from `foo.drv`).

To that end, we create `Single{Derivation,BuiltPath}` types, that are
very similar except instead of having multiple outputs (in a set or
map), they have a single one. This is for everything to the left of the
rightmost `^`.

`NixStringContextElem` has an analogous change, and now can reuse
`SingleDerivedPath` at the top level. In fact, if we ever get rid of
`DrvDeep`, `NixStringContextElem` could be replaced with
`SingleDerivedPath` entirely!

Important note: some JSON formats have changed.

We already can *produce* dynamic derivations, but we can't refer to them
directly. Today, we can merely express building or example at the top
imperatively over time by building `foo.drv^bar.drv`, and then with a
second nix invocation doing `<result-from-first>^baz`, but this is not
declarative. The ethos of Nix of being able to write down the full plan
everything you want to do, and then execute than plan with a single
command, and for that we need the new inductive form of these types.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
This commit is contained in:
John Ericson 2023-01-15 17:39:04 -05:00
parent d00fe5f225
commit 60b7121d2c
48 changed files with 1136 additions and 267 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
doc/manual/src/release-notes/rl-next.md
View file

@ -16,3 +16,6 @@
[unsafeDiscardReferences](@docroot@/contributing/experimental-features.md#xp-feature-discard-references)
attribute is no longer guarded by an experimental flag and can be used
freely.
- The JSON output for derived paths with are store paths is now a string, not an object with a single `path` field.
This only affects `nix-build --json` when "building" non-derivation things like fetched sources, which is a no-op.

7
src/build-remote/build-remote.cc
View file

@ -322,7 +322,12 @@ connected:
throw Error("build of '%s' on '%s' failed: %s", store->printStorePath(*drvPath), storeUri, result.errorMsg);
} else {
copyClosure(*store, *sshStore, StorePathSet {*drvPath}, NoRepair, NoCheckSigs, substitute);
auto res = sshStore->buildPathsWithResults({ DerivedPath::Built { *drvPath, OutputsSpec::All {} } });
auto res = sshStore->buildPathsWithResults({
DerivedPath::Built {
.drvPath = makeConstantStorePathRef(*drvPath),
.outputs = OutputsSpec::All {},
}
});
// One path to build should produce exactly one build result
assert(res.size() == 1);
optResult = std::move(res[0]);

76
src/libcmd/built-path.cc
View file

@ -8,13 +8,39 @@
namespace nix {
nlohmann::json BuiltPath::Built::toJSON(ref<Store> store) const {
nlohmann::json res;
res["drvPath"] = store->printStorePath(drvPath);
for (const auto& [output, path] : outputs) {
res["outputs"][output] = store->printStorePath(path);
#define CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, COMPARATOR) \
bool MY_TYPE ::operator COMPARATOR (const MY_TYPE & other) const \
{ \
const MY_TYPE* me = this; \
auto fields1 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
me = &other; \
auto fields2 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
return fields1 COMPARATOR fields2; \
}
return res;
#define CMP(CHILD_TYPE, MY_TYPE, FIELD) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, ==) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, !=) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, <)
#define FIELD_TYPE std::pair<std::string, StorePath>
CMP(SingleBuiltPath, SingleBuiltPathBuilt, output)
#undef FIELD_TYPE
#define FIELD_TYPE std::map<std::string, StorePath>
CMP(SingleBuiltPath, BuiltPathBuilt, outputs)
#undef FIELD_TYPE
#undef CMP
#undef CMP_ONE
StorePath SingleBuiltPath::outPath() const
{
return std::visit(
overloaded{
[](const SingleBuiltPath::Opaque & p) { return p.path; },
[](const SingleBuiltPath::Built & b) { return b.output.second; },
}, raw()
);
}
StorePathSet BuiltPath::outPaths() const
@ -32,6 +58,40 @@ StorePathSet BuiltPath::outPaths() const
);
}
nlohmann::json BuiltPath::Built::toJSON(const Store & store) const
{
nlohmann::json res;
res["drvPath"] = drvPath->toJSON(store);
for (const auto & [outputName, outputPath] : outputs) {
res["outputs"][outputName] = store.printStorePath(outputPath);
}
return res;
}
nlohmann::json SingleBuiltPath::Built::toJSON(const Store & store) const
{
nlohmann::json res;
res["drvPath"] = drvPath->toJSON(store);
auto & [outputName, outputPath] = output;
res["output"] = outputName;
res["outputPath"] = store.printStorePath(outputPath);
return res;
}
nlohmann::json SingleBuiltPath::toJSON(const Store & store) const
{
return std::visit([&](const auto & buildable) {
return buildable.toJSON(store);
}, raw());
}
nlohmann::json BuiltPath::toJSON(const Store & store) const
{
return std::visit([&](const auto & buildable) {
return buildable.toJSON(store);
}, raw());
}
RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
{
RealisedPath::Set res;
@ -40,7 +100,7 @@ RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
[&](const BuiltPath::Opaque & p) { res.insert(p.path); },
[&](const BuiltPath::Built & p) {
auto drvHashes =
staticOutputHashes(store, store.readDerivation(p.drvPath));
staticOutputHashes(store, store.readDerivation(p.drvPath->outPath()));
for (auto& [outputName, outputPath] : p.outputs) {
if (experimentalFeatureSettings.isEnabled(
Xp::CaDerivations)) {
@ -48,7 +108,7 @@ RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
if (!drvOutput)
throw Error(
"the derivation '%s' has unrealised output '%s' (derived-path.cc/toRealisedPaths)",
store.printStorePath(p.drvPath), outputName);
store.printStorePath(p.drvPath->outPath()), outputName);
auto thisRealisation = store.queryRealisation(
DrvOutput{*drvOutput, outputName});
assert(thisRealisation); // We’ve built it, so we must

50
src/libcmd/built-path.hh
View file

@ -3,19 +3,60 @@
namespace nix {
struct SingleBuiltPath;
struct SingleBuiltPathBuilt {
ref<SingleBuiltPath> drvPath;
std::pair<std::string, StorePath> output;
std::string to_string(const Store & store) const;
static SingleBuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
nlohmann::json toJSON(const Store & store) const;
DECLARE_CMP(SingleBuiltPathBuilt);
};
using _SingleBuiltPathRaw = std::variant<
DerivedPathOpaque,
SingleBuiltPathBuilt
>;
struct SingleBuiltPath : _SingleBuiltPathRaw {
using Raw = _SingleBuiltPathRaw;
using Raw::Raw;
using Opaque = DerivedPathOpaque;
using Built = SingleBuiltPathBuilt;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
StorePath outPath() const;
static SingleBuiltPath parse(const Store & store, std::string_view);
nlohmann::json toJSON(const Store & store) const;
};
static inline ref<SingleBuiltPath> staticDrv(StorePath drvPath)
{
return make_ref<SingleBuiltPath>(SingleBuiltPath::Opaque { drvPath });
}
/**
* A built derived path with hints in the form of optional concrete output paths.
*
* See 'BuiltPath' for more an explanation.
*/
struct BuiltPathBuilt {
StorePath drvPath;
ref<SingleBuiltPath> drvPath;
std::map<std::string, StorePath> outputs;
nlohmann::json toJSON(ref<Store> store) const;
static BuiltPathBuilt parse(const Store & store, std::string_view);
std::string to_string(const Store & store) const;
static BuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
nlohmann::json toJSON(const Store & store) const;
GENERATE_CMP(BuiltPathBuilt, me->drvPath, me->outputs);
DECLARE_CMP(BuiltPathBuilt);
};
using _BuiltPathRaw = std::variant<
@ -41,6 +82,7 @@ struct BuiltPath : _BuiltPathRaw {
StorePathSet outPaths() const;
RealisedPath::Set toRealisedPaths(Store & store) const;
nlohmann::json toJSON(const Store & store) const;
};
typedef std::vector<BuiltPath> BuiltPaths;

2
src/libcmd/installable-attr-path.cc
View file

@ -92,7 +92,7 @@ DerivedPathsWithInfo InstallableAttrPath::toDerivedPaths()
for (auto & [drvPath, outputs] : byDrvPath)
res.push_back({
.path = DerivedPath::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = outputs,
},
.info = make_ref<ExtraPathInfoValue>(ExtraPathInfoValue::Value {

15
src/libcmd/installable-derived-path.cc
View file

@ -18,14 +18,7 @@ DerivedPathsWithInfo InstallableDerivedPath::toDerivedPaths()
std::optional<StorePath> InstallableDerivedPath::getStorePath()
{
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) {
return bfd.drvPath;
},
[&](const DerivedPath::Opaque & bo) {
return bo.path;
},
}, derivedPath.raw());
return derivedPath.getBaseStorePath();
}
InstallableDerivedPath InstallableDerivedPath::parse(
@ -42,7 +35,7 @@ InstallableDerivedPath InstallableDerivedPath::parse(
// Remove this prior to stabilizing the new CLI.
if (storePath.isDerivation()) {
auto oldDerivedPath = DerivedPath::Built {
.drvPath = storePath,
.drvPath = makeConstantStorePathRef(storePath),
.outputs = OutputsSpec::All { },
};
warn(
@ -55,8 +48,10 @@ InstallableDerivedPath InstallableDerivedPath::parse(
},
// If the user did use ^, we just do exactly what is written.
[&](const ExtendedOutputsSpec::Explicit & outputSpec) -> DerivedPath {
auto drv = make_ref<SingleDerivedPath>(SingleDerivedPath::parse(*store, prefix));
drvRequireExperiment(*drv);
return DerivedPath::Built {
.drvPath = store->parseStorePath(prefix),
.drvPath = std::move(drv),
.outputs = outputSpec,
};
},

2
src/libcmd/installable-flake.cc
View file

@ -118,7 +118,7 @@ DerivedPathsWithInfo InstallableFlake::toDerivedPaths()
return {{
.path = DerivedPath::Built {
.drvPath = std::move(drvPath),
.drvPath = makeConstantStorePathRef(std::move(drvPath)),
.outputs = std::visit(overloaded {
[&](const ExtendedOutputsSpec::Default & d) -> OutputsSpec {
std::set<std::string> outputsToInstall;

3
src/libcmd/installable-value.cc
View file

@ -55,7 +55,8 @@ std::optional<DerivedPathWithInfo> InstallableValue::trySinglePathToDerivedPaths
else if (v.type() == nString) {
return {{
.path = state->coerceToDerivedPath(pos, v, errorCtx),
.path = DerivedPath::fromSingle(
state->coerceToSingleDerivedPath(pos, v, errorCtx)),
.info = make_ref<ExtraPathInfo>(),
}};
}

36
src/libcmd/installables.cc
View file

@ -515,6 +515,30 @@ ref<Installable> SourceExprCommand::parseInstallable(
return installables.front();
}
static SingleBuiltPath getBuiltPath(ref<Store> evalStore, ref<Store> store, const SingleDerivedPath & b)
{
return std::visit(
overloaded{
[&](const SingleDerivedPath::Opaque & bo) -> SingleBuiltPath {
return SingleBuiltPath::Opaque { bo.path };
},
[&](const SingleDerivedPath::Built & bfd) -> SingleBuiltPath {
auto drvPath = getBuiltPath(evalStore, store, *bfd.drvPath);
// Resolving this instead of `bfd` will yield the same result, but avoid duplicative work.
SingleDerivedPath::Built truncatedBfd {
.drvPath = makeConstantStorePathRef(drvPath.outPath()),
.output = bfd.output,
};
auto outputPath = resolveDerivedPath(*store, truncatedBfd, &*evalStore);
return SingleBuiltPath::Built {
.drvPath = make_ref<SingleBuiltPath>(std::move(drvPath)),
.output = { bfd.output, outputPath },
};
},
},
b.raw());
}
std::vector<BuiltPathWithResult> Installable::build(
ref<Store> evalStore,
ref<Store> store,
@ -568,7 +592,10 @@ std::vector<std::pair<ref<Installable>, BuiltPathWithResult>> Installable::build
[&](const DerivedPath::Built & bfd) {
auto outputs = resolveDerivedPath(*store, bfd, &*evalStore);
res.push_back({aux.installable, {
.path = BuiltPath::Built { bfd.drvPath, outputs },
.path = BuiltPath::Built {
.drvPath = make_ref<SingleBuiltPath>(getBuiltPath(evalStore, store, *bfd.drvPath)),
.outputs = outputs,
},
.info = aux.info}});
},
[&](const DerivedPath::Opaque & bo) {
@ -597,7 +624,10 @@ std::vector<std::pair<ref<Installable>, BuiltPathWithResult>> Installable::build
for (auto & [outputName, realisation] : buildResult.builtOutputs)
outputs.emplace(outputName, realisation.outPath);
res.push_back({aux.installable, {
.path = BuiltPath::Built { bfd.drvPath, outputs },
.path = BuiltPath::Built {
.drvPath = make_ref<SingleBuiltPath>(getBuiltPath(evalStore, store, *bfd.drvPath)),
.outputs = outputs,
},
.info = aux.info,
.result = buildResult}});
},
@ -691,7 +721,7 @@ StorePathSet Installable::toDerivations(
: throw Error("argument '%s' did not evaluate to a derivation", i->what()));
},
[&](const DerivedPath::Built & bfd) {
drvPaths.insert(bfd.drvPath);
drvPaths.insert(resolveDerivedPath(*store, *bfd.drvPath));
},
}, b.path.raw());

2
src/libcmd/repl.cc
View file

@ -648,7 +648,7 @@ bool NixRepl::processLine(std::string line)
if (command == ":b" || command == ":bl") {
state->store->buildPaths({
DerivedPath::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::All { },
},
});

2
src/libexpr/eval-cache.cc
View file

@ -599,7 +599,7 @@ string_t AttrCursor::getStringWithContext()
return d.drvPath;
},
[&](const NixStringContextElem::Built & b) -> const StorePath & {
return b.drvPath;
return b.drvPath->getBaseStorePath();
},
[&](const NixStringContextElem::Opaque & o) -> const StorePath & {
return o.path;

59
src/libexpr/eval.cc
View file

@ -1042,7 +1042,7 @@ void EvalState::mkOutputString(
: DownstreamPlaceholder::unknownCaOutput(drvPath, outputName, xpSettings).render(),
NixStringContext {
NixStringContextElem::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.output = outputName,
}
});
@ -2299,7 +2299,7 @@ StorePath EvalState::coerceToStorePath(const PosIdx pos, Value & v, NixStringCon
}
std::pair<DerivedPath, std::string_view> EvalState::coerceToDerivedPathUnchecked(const PosIdx pos, Value & v, std::string_view errorCtx)
std::pair<SingleDerivedPath, std::string_view> EvalState::coerceToSingleDerivedPathUnchecked(const PosIdx pos, Value & v, std::string_view errorCtx)
{
NixStringContext context;
auto s = forceString(v, context, pos, errorCtx);
@ -2310,21 +2310,16 @@ std::pair<DerivedPath, std::string_view> EvalState::coerceToDerivedPathUnchecked
s, csize)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
auto derivedPath = std::visit(overloaded {
[&](NixStringContextElem::Opaque && o) -> DerivedPath {
return DerivedPath::Opaque {
.path = std::move(o.path),
};
[&](NixStringContextElem::Opaque && o) -> SingleDerivedPath {
return std::move(o);
},
[&](NixStringContextElem::DrvDeep &&) -> DerivedPath {
[&](NixStringContextElem::DrvDeep &&) -> SingleDerivedPath {
error(
"string '%s' has a context which refers to a complete source and binary closure. This is not supported at this time",
s).withTrace(pos, errorCtx).debugThrow<EvalError>();
},
[&](NixStringContextElem::Built && b) -> DerivedPath {
return DerivedPath::Built {
.drvPath = std::move(b.drvPath),
.outputs = OutputsSpec::Names { std::move(b.output) },
};
[&](NixStringContextElem::Built && b) -> SingleDerivedPath {
return std::move(b);
},
}, ((NixStringContextElem &&) *context.begin()).raw());
return {
@ -2334,12 +2329,12 @@ std::pair<DerivedPath, std::string_view> EvalState::coerceToDerivedPathUnchecked
}
DerivedPath EvalState::coerceToDerivedPath(const PosIdx pos, Value & v, std::string_view errorCtx)
SingleDerivedPath EvalState::coerceToSingleDerivedPath(const PosIdx pos, Value & v, std::string_view errorCtx)
{
auto [derivedPath, s_] = coerceToDerivedPathUnchecked(pos, v, errorCtx);
auto [derivedPath, s_] = coerceToSingleDerivedPathUnchecked(pos, v, errorCtx);
auto s = s_;
std::visit(overloaded {
[&](const DerivedPath::Opaque & o) {
[&](const SingleDerivedPath::Opaque & o) {
auto sExpected = store->printStorePath(o.path);
if (s != sExpected)
error(
@ -2347,25 +2342,27 @@ DerivedPath EvalState::coerceToDerivedPath(const PosIdx pos, Value & v, std::str
s, sExpected)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
},
[&](const DerivedPath::Built & b) {
// TODO need derived path with single output to make this
// total. Will add as part of RFC 92 work and then this is
// cleaned up.
auto output = *std::get<OutputsSpec::Names>(b.outputs).begin();
auto drv = store->readDerivation(b.drvPath);
auto i = drv.outputs.find(output);
if (i == drv.outputs.end())
throw Error("derivation '%s' does not have output '%s'", store->printStorePath(b.drvPath), output);
auto optOutputPath = i->second.path(*store, drv.name, output);
// This is testing for the case of CA derivations
auto sExpected = optOutputPath
? store->printStorePath(*optOutputPath)
: DownstreamPlaceholder::unknownCaOutput(b.drvPath, output).render();
[&](const SingleDerivedPath::Built & b) {
auto sExpected = std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & o) {
auto drv = store->readDerivation(o.path);
auto i = drv.outputs.find(b.output);
if (i == drv.outputs.end())
throw Error("derivation '%s' does not have output '%s'", b.drvPath->to_string(*store), b.output);
auto optOutputPath = i->second.path(*store, drv.name, b.output);
// This is testing for the case of CA derivations
return optOutputPath
? store->printStorePath(*optOutputPath)
: DownstreamPlaceholder::fromSingleDerivedPathBuilt(b).render();
},
[&](const SingleDerivedPath::Built & o) {
return DownstreamPlaceholder::fromSingleDerivedPathBuilt(b).render();
},
}, b.drvPath->raw());
if (s != sExpected)
error(
"string '%s' has context with the output '%s' from derivation '%s', but the string is not the right placeholder for this derivation output. It should be '%s'",
s, output, store->printStorePath(b.drvPath), sExpected)
s, b.output, b.drvPath->to_string(*store), sExpected)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
}
}, derivedPath.raw());

10
src/libexpr/eval.hh
View file

@ -22,7 +22,7 @@ namespace nix {
class Store;
class EvalState;
class StorePath;
struct DerivedPath;
struct SingleDerivedPath;
enum RepairFlag : bool;
@ -532,12 +532,12 @@ public:
StorePath coerceToStorePath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx);
/**
* Part of `coerceToDerivedPath()` without any store IO which is exposed for unit testing only.
* Part of `coerceToSingleDerivedPath()` without any store IO which is exposed for unit testing only.
*/
std::pair<DerivedPath, std::string_view> coerceToDerivedPathUnchecked(const PosIdx pos, Value & v, std::string_view errorCtx);
std::pair<SingleDerivedPath, std::string_view> coerceToSingleDerivedPathUnchecked(const PosIdx pos, Value & v, std::string_view errorCtx);
/**
* Coerce to `DerivedPath`.
* Coerce to `SingleDerivedPath`.
*
* Must be a string which is either a literal store path or a
* "placeholder (see `DownstreamPlaceholder`).
@ -551,7 +551,7 @@ public:
* source of truth, and ultimately tells us what we want, and then
* we ensure the string corresponds to it.
*/
DerivedPath coerceToDerivedPath(const PosIdx pos, Value & v, std::string_view errorCtx);
SingleDerivedPath coerceToSingleDerivedPath(const PosIdx pos, Value & v, std::string_view errorCtx);
public:

15
src/libexpr/primops.cc
View file

@ -56,7 +56,7 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
.drvPath = b.drvPath,
.outputs = OutputsSpec::Names { b.output },
});
ensureValid(b.drvPath);
ensureValid(b.drvPath->getBaseStorePath());
},
[&](const NixStringContextElem::Opaque & o) {
auto ctxS = store->printStorePath(o.path);
@ -77,7 +77,7 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
if (!evalSettings.enableImportFromDerivation)
debugThrowLastTrace(Error(
"cannot build '%1%' during evaluation because the option 'allow-import-from-derivation' is disabled",
store->printStorePath(drvs.begin()->drvPath)));
drvs.begin()->to_string(*store)));
/* Build/substitute the context. */
std::vector<DerivedPath> buildReqs;
@ -95,7 +95,11 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
/* Get all the output paths corresponding to the placeholders we had */
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
res.insert_or_assign(
DownstreamPlaceholder::unknownCaOutput(drv.drvPath, outputName).render(),
DownstreamPlaceholder::fromSingleDerivedPathBuilt(
SingleDerivedPath::Built {
.drvPath = drv.drvPath,
.output = outputName,
}).render(),
store->printStorePath(outputPath)
);
}
@ -1251,7 +1255,10 @@ drvName, Bindings * attrs, Value & v)
}
},
[&](const NixStringContextElem::Built & b) {
drv.inputDrvs[b.drvPath].insert(b.output);
if (auto * p = std::get_if<DerivedPath::Opaque>(&*b.drvPath))
drv.inputDrvs[p->path].insert(b.output);
else
throw UnimplementedError("Dependencies on the outputs of dynamic derivations are not yet supported");
},
[&](const NixStringContextElem::Opaque & o) {
drv.inputSrcs.insert(o.path);

7
src/libexpr/primops/context.cc
View file

@ -106,7 +106,10 @@ static void prim_getContext(EvalState & state, const PosIdx pos, Value * * args,
contextInfos[std::move(d.drvPath)].allOutputs = true;
},
[&](NixStringContextElem::Built && b) {
contextInfos[std::move(b.drvPath)].outputs.emplace_back(std::move(b.output));
// FIXME should eventually show string context as is, no
// resolving here.
auto drvPath = resolveDerivedPath(*state.store, *b.drvPath);
contextInfos[std::move(drvPath)].outputs.emplace_back(std::move(b.output));
},
[&](NixStringContextElem::Opaque && o) {
contextInfos[std::move(o.path)].path = true;
@ -222,7 +225,7 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
for (auto elem : iter->value->listItems()) {
auto outputName = state.forceStringNoCtx(*elem, iter->pos, "while evaluating an output name within a string context");
context.emplace(NixStringContextElem::Built {
.drvPath = namePath,
.drvPath = makeConstantStorePathRef(namePath),
.output = std::string { outputName },
});
}

26
src/libexpr/tests/derived-path.cc
View file

@ -21,12 +21,12 @@ TEST_F(DerivedPathExpressionTest, force_init)
RC_GTEST_FIXTURE_PROP(
DerivedPathExpressionTest,
prop_opaque_path_round_trip,
(const DerivedPath::Opaque & o))
(const SingleDerivedPath::Opaque & o))
{
auto * v = state.allocValue();
state.mkStorePathString(o.path, *v);
auto d = state.coerceToDerivedPath(noPos, *v, "");
RC_ASSERT(DerivedPath { o } == d);
auto d = state.coerceToSingleDerivedPath(noPos, *v, "");
RC_ASSERT(SingleDerivedPath { o } == d);
}
// TODO use DerivedPath::Built for parameter once it supports a single output
@ -46,12 +46,12 @@ RC_GTEST_FIXTURE_PROP(
auto * v = state.allocValue();
state.mkOutputString(*v, drvPath, outputName.name, std::nullopt, mockXpSettings);
auto [d, _] = state.coerceToDerivedPathUnchecked(noPos, *v, "");
DerivedPath::Built b {
.drvPath = drvPath,
.outputs = OutputsSpec::Names { outputName.name },
auto [d, _] = state.coerceToSingleDerivedPathUnchecked(noPos, *v, "");
SingleDerivedPath::Built b {
.drvPath = makeConstantStorePathRef(drvPath),
.output = outputName.name,
};
RC_ASSERT(DerivedPath { b } == d);
RC_ASSERT(SingleDerivedPath { b } == d);
}
RC_GTEST_FIXTURE_PROP(
@ -61,12 +61,12 @@ RC_GTEST_FIXTURE_PROP(
{
auto * v = state.allocValue();
state.mkOutputString(*v, drvPath, outputName.name, outPath);
auto [d, _] = state.coerceToDerivedPathUnchecked(noPos, *v, "");
DerivedPath::Built b {
.drvPath = drvPath,
.outputs = OutputsSpec::Names { outputName.name },
auto [d, _] = state.coerceToSingleDerivedPathUnchecked(noPos, *v, "");
SingleDerivedPath::Built b {
.drvPath = makeConstantStorePathRef(drvPath),
.output = outputName.name,
};
RC_ASSERT(DerivedPath { b } == d);
RC_ASSERT(SingleDerivedPath { b } == d);
}
} /* namespace nix */

70
src/libexpr/tests/value/context.cc
View file

@ -8,6 +8,8 @@
namespace nix {
// Test a few cases of invalid string context elements.
TEST(NixStringContextElemTest, empty_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(""),
@ -38,6 +40,10 @@ TEST(NixStringContextElemTest, slash_invalid) {
BadStorePath);
}
/**
* Round trip (string <-> data structure) test for
* `NixStringContextElem::Opaque`.
*/
TEST(NixStringContextElemTest, opaque) {
std::string_view opaque = "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x";
auto elem = NixStringContextElem::parse(opaque);
@ -47,6 +53,10 @@ TEST(NixStringContextElemTest, opaque) {
ASSERT_EQ(elem.to_string(), opaque);
}
/**
* Round trip (string <-> data structure) test for
* `NixStringContextElem::DrvDeep`.
*/
TEST(NixStringContextElemTest, drvDeep) {
std::string_view drvDeep = "=g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv";
auto elem = NixStringContextElem::parse(drvDeep);
@ -56,28 +66,62 @@ TEST(NixStringContextElemTest, drvDeep) {
ASSERT_EQ(elem.to_string(), drvDeep);
}
TEST(NixStringContextElemTest, built) {
/**
* Round trip (string <-> data structure) test for a simpler
* `NixStringContextElem::Built`.
*/
TEST(NixStringContextElemTest, built_opaque) {
std::string_view built = "!foo!g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv";
auto elem = NixStringContextElem::parse(built);
auto * p = std::get_if<NixStringContextElem::Built>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->output, "foo");
ASSERT_EQ(p->drvPath, StorePath { built.substr(5) });
ASSERT_EQ(*p->drvPath, ((SingleDerivedPath) SingleDerivedPath::Opaque {
.path = StorePath { built.substr(5) },
}));
ASSERT_EQ(elem.to_string(), built);
}
/**
* Round trip (string <-> data structure) test for a more complex,
* inductive `NixStringContextElem::Built`.
*/
TEST(NixStringContextElemTest, built_built) {
/**
* We set these in tests rather than the regular globals so we don't have
* to worry about race conditions if the tests run concurrently.
*/
ExperimentalFeatureSettings mockXpSettings;
mockXpSettings.set("experimental-features", "dynamic-derivations ca-derivations");
std::string_view built = "!foo!bar!g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv";
auto elem = NixStringContextElem::parse(built, mockXpSettings);
auto * p = std::get_if<NixStringContextElem::Built>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->output, "foo");
auto * drvPath = std::get_if<SingleDerivedPath::Built>(&*p->drvPath);
ASSERT_TRUE(drvPath);
ASSERT_EQ(drvPath->output, "bar");
ASSERT_EQ(*drvPath->drvPath, ((SingleDerivedPath) SingleDerivedPath::Opaque {
.path = StorePath { built.substr(9) },
}));
ASSERT_EQ(elem.to_string(), built);
}
/**
* Without the right experimental features enabled, we cannot parse a
* complex inductive string context element.
*/
TEST(NixStringContextElemTest, built_built_xp) {
ASSERT_THROW(
NixStringContextElem::parse("!foo!bar!g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv"), MissingExperimentalFeature);
}
}
namespace rc {
using namespace nix;
Gen<NixStringContextElem::Opaque> Arbitrary<NixStringContextElem::Opaque>::arbitrary()
{
return gen::just(NixStringContextElem::Opaque {
.path = *gen::arbitrary<StorePath>(),
});
}
Gen<NixStringContextElem::DrvDeep> Arbitrary<NixStringContextElem::DrvDeep>::arbitrary()
{
return gen::just(NixStringContextElem::DrvDeep {
@ -85,14 +129,6 @@ Gen<NixStringContextElem::DrvDeep> Arbitrary<NixStringContextElem::DrvDeep>::arb
});
}
Gen<NixStringContextElem::Built> Arbitrary<NixStringContextElem::Built>::arbitrary()
{
return gen::just(NixStringContextElem::Built {
.drvPath = *gen::arbitrary<StorePath>(),
.output = (*gen::arbitrary<StorePathName>()).name,
});
}
Gen<NixStringContextElem> Arbitrary<NixStringContextElem>::arbitrary()
{
switch (*gen::inRange<uint8_t>(0, std::variant_size_v<NixStringContextElem::Raw>)) {

97
src/libexpr/value/context.cc
View file

@ -4,29 +4,52 @@
namespace nix {
NixStringContextElem NixStringContextElem::parse(std::string_view s0)
NixStringContextElem NixStringContextElem::parse(
std::string_view s0,
const ExperimentalFeatureSettings & xpSettings)
{
std::string_view s = s0;
std::function<SingleDerivedPath()> parseRest;
parseRest = [&]() -> SingleDerivedPath {
// Case on whether there is a '!'
size_t index = s.find("!");
if (index == std::string_view::npos) {
return SingleDerivedPath::Opaque {
.path = StorePath { s },
};
} else {
std::string output { s.substr(0, index) };
// Advance string to parse after the '!'
s = s.substr(index + 1);
auto drv = make_ref<SingleDerivedPath>(parseRest());
drvRequireExperiment(*drv, xpSettings);
return SingleDerivedPath::Built {
.drvPath = std::move(drv),
.output = std::move(output),
};
}
};
if (s.size() == 0) {
throw BadNixStringContextElem(s0,
"String context element should never be an empty string");
}
switch (s.at(0)) {
case '!': {
s = s.substr(1); // advance string to parse after first !
size_t index = s.find("!");
// This makes index + 1 safe. Index can be the length (one after index
// of last character), so given any valid character index --- a
// successful find --- we can add one.
if (index == std::string_view::npos) {
// Advance string to parse after the '!'
s = s.substr(1);
// Find *second* '!'
if (s.find("!") == std::string_view::npos) {
throw BadNixStringContextElem(s0,
"String content element beginning with '!' should have a second '!'");
}
return NixStringContextElem::Built {
.drvPath = StorePath { s.substr(index + 1) },
.output = std::string(s.substr(0, index)),
};
return std::visit(
[&](auto x) -> NixStringContextElem { return std::move(x); },
parseRest());
}
case '=': {
return NixStringContextElem::DrvDeep {
@ -34,33 +57,51 @@ NixStringContextElem NixStringContextElem::parse(std::string_view s0)
};
}
default: {
return NixStringContextElem::Opaque {
.path = StorePath { s },
};
// Ensure no '!'
if (s.find("!") != std::string_view::npos) {
throw BadNixStringContextElem(s0,
"String content element not beginning with '!' should not have a second '!'");
}
return std::visit(
[&](auto x) -> NixStringContextElem { return std::move(x); },
parseRest());
}
}
}
std::string NixStringContextElem::to_string() const {
return std::visit(overloaded {
std::string NixStringContextElem::to_string() const
{
std::string res;
std::function<void(const SingleDerivedPath &)> toStringRest;
toStringRest = [&](auto & p) {
std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & o) {
res += o.path.to_string();
},
[&](const SingleDerivedPath::Built & o) {
res += o.output;
res += '!';
toStringRest(*o.drvPath);
},
}, p.raw());
};
std::visit(overloaded {
[&](const NixStringContextElem::Built & b) {
std::string res;
res += '!';
res += b.output;
res += '!';
res += b.drvPath.to_string();
return res;
},
[&](const NixStringContextElem::DrvDeep & d) {
std::string res;
res += '=';
res += d.drvPath.to_string();
return res;
toStringRest(b);
},
[&](const NixStringContextElem::Opaque & o) {
return std::string { o.path.to_string() };
toStringRest(o);
},
[&](const NixStringContextElem::DrvDeep & d) {
res += '=';
res += d.drvPath.to_string();
},
}, raw());
return res;
}
}

21
src/libexpr/value/context.hh
View file

@ -3,7 +3,7 @@
#include "util.hh"
#include "comparator.hh"
#include "path.hh"
#include "derived-path.hh"
#include <variant>
@ -31,11 +31,7 @@ public:
*
* Encoded as just the path: ‘<path>’.
*/
struct NixStringContextElem_Opaque {
StorePath path;
GENERATE_CMP(NixStringContextElem_Opaque, me->path);
};
typedef SingleDerivedPath::Opaque NixStringContextElem_Opaque;
/**
* Path to a derivation and its entire build closure.
@ -57,12 +53,7 @@ struct NixStringContextElem_DrvDeep {
*
* Encoded in the form ‘!<output>!<drvPath>’.
*/
struct NixStringContextElem_Built {
StorePath drvPath;
std::string output;
GENERATE_CMP(NixStringContextElem_Built, me->drvPath, me->output);
};
typedef SingleDerivedPath::Built NixStringContextElem_Built;
using _NixStringContextElem_Raw = std::variant<
NixStringContextElem_Opaque,
@ -93,8 +84,12 @@ struct NixStringContextElem : _NixStringContextElem_Raw {
* - ‘<path>’
* - ‘=<path>’
* - ‘!<name>!<path>’
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static NixStringContextElem parse(std::string_view s);
static NixStringContextElem parse(
std::string_view s,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
std::string to_string() const;
};

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

@ -65,7 +65,7 @@ namespace nix {
DerivationGoal::DerivationGoal(const StorePath & drvPath,
const OutputsSpec & wantedOutputs, Worker & worker, BuildMode buildMode)
: Goal(worker, DerivedPath::Built { .drvPath = drvPath, .outputs = wantedOutputs })
: Goal(worker, DerivedPath::Built { .drvPath = makeConstantStorePathRef(drvPath), .outputs = wantedOutputs })
, useDerivation(true)
, drvPath(drvPath)
, wantedOutputs(wantedOutputs)
@ -74,7 +74,7 @@ DerivationGoal::DerivationGoal(const StorePath & drvPath,
state = &DerivationGoal::getDerivation;
name = fmt(
"building of '%s' from .drv file",
DerivedPath::Built { drvPath, wantedOutputs }.to_string(worker.store));
DerivedPath::Built { makeConstantStorePathRef(drvPath), wantedOutputs }.to_string(worker.store));
trace("created");
mcExpectedBuilds = std::make_unique<MaintainCount<uint64_t>>(worker.expectedBuilds);
@ -84,7 +84,7 @@ DerivationGoal::DerivationGoal(const StorePath & drvPath,
DerivationGoal::DerivationGoal(const StorePath & drvPath, const BasicDerivation & drv,
const OutputsSpec & wantedOutputs, Worker & worker, BuildMode buildMode)
: Goal(worker, DerivedPath::Built { .drvPath = drvPath, .outputs = wantedOutputs })
: Goal(worker, DerivedPath::Built { .drvPath = makeConstantStorePathRef(drvPath), .outputs = wantedOutputs })
, useDerivation(false)
, drvPath(drvPath)
, wantedOutputs(wantedOutputs)
@ -95,7 +95,7 @@ DerivationGoal::DerivationGoal(const StorePath & drvPath, const BasicDerivation
state = &DerivationGoal::haveDerivation;
name = fmt(
"building of '%s' from in-memory derivation",
DerivedPath::Built { drvPath, drv.outputNames() }.to_string(worker.store));
DerivedPath::Built { makeConstantStorePathRef(drvPath), drv.outputNames() }.to_string(worker.store));
trace("created");
mcExpectedBuilds = std::make_unique<MaintainCount<uint64_t>>(worker.expectedBuilds);
@ -1490,7 +1490,7 @@ void DerivationGoal::waiteeDone(GoalPtr waitee, ExitCode result)
for (auto & outputName : outputs->second) {
auto buildResult = dg->getBuildResult(DerivedPath::Built {
.drvPath = dg->drvPath,
.drvPath = makeConstantStorePathRef(dg->drvPath),
.outputs = OutputsSpec::Names { outputName },
});
if (buildResult.success()) {

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

@ -77,7 +77,7 @@ BuildResult Store::buildDerivation(const StorePath & drvPath, const BasicDerivat
try {
worker.run(Goals{goal});
return goal->getBuildResult(DerivedPath::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::All {},
});
} catch (Error & e) {

15
src/libstore/build/local-derivation-goal.cc
View file

@ -1172,6 +1172,19 @@ void LocalDerivationGoal::writeStructuredAttrs()
}
static StorePath pathPartOfReq(const SingleDerivedPath & req)
{
return std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & bo) {
return bo.path;
},
[&](const SingleDerivedPath::Built & bfd) {
return pathPartOfReq(*bfd.drvPath);
},
}, req.raw());
}
static StorePath pathPartOfReq(const DerivedPath & req)
{
return std::visit(overloaded {
@ -1179,7 +1192,7 @@ static StorePath pathPartOfReq(const DerivedPath & req)
return bo.path;
},
[&](const DerivedPath::Built & bfd) {
return bfd.drvPath;
return pathPartOfReq(*bfd.drvPath);
},
}, req.raw());
}

7
src/libstore/build/worker.cc
View file

@ -111,7 +111,10 @@ GoalPtr Worker::makeGoal(const DerivedPath & req, BuildMode buildMode)
{
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) -> GoalPtr {
return makeDerivationGoal(bfd.drvPath, bfd.outputs, buildMode);
if (auto bop = std::get_if<DerivedPath::Opaque>(&*bfd.drvPath))
return makeDerivationGoal(bop->path, bfd.outputs, buildMode);
else
throw UnimplementedError("Building dynamic derivations in one shot is not yet implemented.");
},
[&](const DerivedPath::Opaque & bo) -> GoalPtr {
return makePathSubstitutionGoal(bo.path, buildMode == bmRepair ? Repair : NoRepair);
@ -265,7 +268,7 @@ void Worker::run(const Goals & _topGoals)
for (auto & i : _topGoals) {
topGoals.insert(i);
if (auto goal = dynamic_cast<DerivationGoal *>(i.get())) {
topPaths.push_back(DerivedPath::Built{goal->drvPath, goal->wantedOutputs});
topPaths.push_back(DerivedPath::Built{makeConstantStorePathRef(goal->drvPath), goal->wantedOutputs});
} else if (auto goal = dynamic_cast<PathSubstitutionGoal *>(i.get())) {
topPaths.push_back(DerivedPath::Opaque{goal->storePath});
}

247
src/libstore/derived-path.cc
View file

@ -7,52 +7,133 @@
namespace nix {
nlohmann::json DerivedPath::Opaque::toJSON(ref<Store> store) const {
#define CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, COMPARATOR) \
bool MY_TYPE ::operator COMPARATOR (const MY_TYPE & other) const \
{ \
const MY_TYPE* me = this; \
auto fields1 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
me = &other; \
auto fields2 = std::make_tuple<const CHILD_TYPE &, const FIELD_TYPE &>(*me->drvPath, me->FIELD); \
return fields1 COMPARATOR fields2; \
}
#define CMP(CHILD_TYPE, MY_TYPE, FIELD) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, ==) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, !=) \
CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, <)
#define FIELD_TYPE std::string
CMP(SingleDerivedPath, SingleDerivedPathBuilt, output)
#undef FIELD_TYPE
#define FIELD_TYPE OutputsSpec
CMP(SingleDerivedPath, DerivedPathBuilt, outputs)
#undef FIELD_TYPE
#undef CMP
#undef CMP_ONE
nlohmann::json DerivedPath::Opaque::toJSON(const Store & store) const
{
return store.printStorePath(path);
}
nlohmann::json SingleDerivedPath::Built::toJSON(Store & store) const {
nlohmann::json res;
res["path"] = store->printStorePath(path);
res["drvPath"] = drvPath->toJSON(store);
// Fallback for the input-addressed derivation case: We expect to always be
// able to print the output paths, so let’s do it
// FIXME try-resolve on drvPath
const auto outputMap = store.queryPartialDerivationOutputMap(resolveDerivedPath(store, *drvPath));
res["output"] = output;
auto outputPathIter = outputMap.find(output);
if (outputPathIter == outputMap.end())
res["outputPath"] = nullptr;
else if (std::optional p = outputPathIter->second)
res["outputPath"] = store.printStorePath(*p);
else
res["outputPath"] = nullptr;
return res;
}
nlohmann::json DerivedPath::Built::toJSON(ref<Store> store) const {
nlohmann::json DerivedPath::Built::toJSON(Store & store) const {
nlohmann::json res;
res["drvPath"] = store->printStorePath(drvPath);
res["drvPath"] = drvPath->toJSON(store);
// Fallback for the input-addressed derivation case: We expect to always be
// able to print the output paths, so let’s do it
const auto outputMap = store->queryPartialDerivationOutputMap(drvPath);
// FIXME try-resolve on drvPath
const auto outputMap = store.queryPartialDerivationOutputMap(resolveDerivedPath(store, *drvPath));
for (const auto & [output, outputPathOpt] : outputMap) {
if (!outputs.contains(output)) continue;
if (outputPathOpt)
res["outputs"][output] = store->printStorePath(*outputPathOpt);
res["outputs"][output] = store.printStorePath(*outputPathOpt);
else
res["outputs"][output] = nullptr;
}
return res;
}
nlohmann::json SingleDerivedPath::toJSON(Store & store) const
{
return std::visit([&](const auto & buildable) {
return buildable.toJSON(store);
}, raw());
}
nlohmann::json DerivedPath::toJSON(Store & store) const
{
return std::visit([&](const auto & buildable) {
return buildable.toJSON(store);
}, raw());
}
std::string DerivedPath::Opaque::to_string(const Store & store) const
{
return store.printStorePath(path);
}
std::string SingleDerivedPath::Built::to_string(const Store & store) const
{
return drvPath->to_string(store) + "^" + output;
}
std::string SingleDerivedPath::Built::to_string_legacy(const Store & store) const
{
return drvPath->to_string(store) + "!" + output;
}
std::string DerivedPath::Built::to_string(const Store & store) const
{
return store.printStorePath(drvPath)
return drvPath->to_string(store)
+ '^'
+ outputs.to_string();
}
std::string DerivedPath::Built::to_string_legacy(const Store & store) const
{
return store.printStorePath(drvPath)
+ '!'
return drvPath->to_string_legacy(store)
+ "!"
+ outputs.to_string();
}
std::string SingleDerivedPath::to_string(const Store & store) const
{
return std::visit(
[&](const auto & req) { return req.to_string(store); },
raw());
}
std::string DerivedPath::to_string(const Store & store) const
{
return std::visit(
[&](const auto & req) { return req.to_string(store); },
raw());
}
std::string SingleDerivedPath::to_string_legacy(const Store & store) const
{
return std::visit(overloaded {
[&](const DerivedPath::Built & req) { return req.to_string(store); },
[&](const DerivedPath::Opaque & req) { return req.to_string(store); },
[&](const SingleDerivedPath::Built & req) { return req.to_string_legacy(store); },
[&](const SingleDerivedPath::Opaque & req) { return req.to_string(store); },
}, this->raw());
}
@ -70,30 +151,156 @@ DerivedPath::Opaque DerivedPath::Opaque::parse(const Store & store, std::string_
return {store.parseStorePath(s)};
}
DerivedPath::Built DerivedPath::Built::parse(const Store & store, std::string_view drvS, std::string_view outputsS)
void drvRequireExperiment(
const SingleDerivedPath & drv,
const ExperimentalFeatureSettings & xpSettings)
{
std::visit(overloaded {
[&](const SingleDerivedPath::Opaque &) {
// plain drv path; no experimental features required.
},
[&](const SingleDerivedPath::Built &) {
xpSettings.require(Xp::DynamicDerivations);
},
}, drv.raw());
}
SingleDerivedPath::Built SingleDerivedPath::Built::parse(
const Store & store, ref<SingleDerivedPath> drv,
std::string_view output,
const ExperimentalFeatureSettings & xpSettings)
{
drvRequireExperiment(*drv, xpSettings);
return {
.drvPath = store.parseStorePath(drvS),
.drvPath = drv,
.output = std::string { output },
};
}
DerivedPath::Built DerivedPath::Built::parse(
const Store & store, ref<SingleDerivedPath> drv,
std::string_view outputsS,
const ExperimentalFeatureSettings & xpSettings)
{
drvRequireExperiment(*drv, xpSettings);
return {
.drvPath = drv,
.outputs = OutputsSpec::parse(outputsS),
};
}
static inline DerivedPath parseWith(const Store & store, std::string_view s, std::string_view separator)
static SingleDerivedPath parseWithSingle(
const Store & store, std::string_view s, std::string_view separator,
const ExperimentalFeatureSettings & xpSettings)
{
size_t n = s.find(separator);
size_t n = s.rfind(separator);
return n == s.npos
? (SingleDerivedPath) SingleDerivedPath::Opaque::parse(store, s)
: (SingleDerivedPath) SingleDerivedPath::Built::parse(store,
make_ref<SingleDerivedPath>(parseWithSingle(
store,
s.substr(0, n),
separator,
xpSettings)),
s.substr(n + 1),
xpSettings);
}
SingleDerivedPath SingleDerivedPath::parse(
const Store & store,
std::string_view s,
const ExperimentalFeatureSettings & xpSettings)
{
return parseWithSingle(store, s, "^", xpSettings);
}
SingleDerivedPath SingleDerivedPath::parseLegacy(
const Store & store,
std::string_view s,
const ExperimentalFeatureSettings & xpSettings)
{
return parseWithSingle(store, s, "!", xpSettings);
}
static DerivedPath parseWith(
const Store & store, std::string_view s, std::string_view separator,
const ExperimentalFeatureSettings & xpSettings)
{
size_t n = s.rfind(separator);
return n == s.npos
? (DerivedPath) DerivedPath::Opaque::parse(store, s)
: (DerivedPath) DerivedPath::Built::parse(store, s.substr(0, n), s.substr(n + 1));
: (DerivedPath) DerivedPath::Built::parse(store,
make_ref<SingleDerivedPath>(parseWithSingle(
store,
s.substr(0, n),
separator,
xpSettings)),
s.substr(n + 1),
xpSettings);
}
DerivedPath DerivedPath::parse(const Store & store, std::string_view s)
DerivedPath DerivedPath::parse(
const Store & store,
std::string_view s,
const ExperimentalFeatureSettings & xpSettings)
{
return parseWith(store, s, "^");
return parseWith(store, s, "^", xpSettings);
}
DerivedPath DerivedPath::parseLegacy(const Store & store, std::string_view s)
DerivedPath DerivedPath::parseLegacy(
const Store & store,
std::string_view s,
const ExperimentalFeatureSettings & xpSettings)
{
return parseWith(store, s, "!");
return parseWith(store, s, "!", xpSettings);
}
DerivedPath DerivedPath::fromSingle(const SingleDerivedPath & req)
{
return std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & o) -> DerivedPath {
return o;
},
[&](const SingleDerivedPath::Built & b) -> DerivedPath {
return DerivedPath::Built {
.drvPath = b.drvPath,
.outputs = OutputsSpec::Names { b.output },
};
},
}, req.raw());
}
const StorePath & SingleDerivedPath::Built::getBaseStorePath() const
{
return drvPath->getBaseStorePath();
}
const StorePath & DerivedPath::Built::getBaseStorePath() const
{
return drvPath->getBaseStorePath();
}
template<typename DP>
static inline const StorePath & getBaseStorePath_(const DP & derivedPath)
{
return std::visit(overloaded {
[&](const typename DP::Built & bfd) -> auto & {
return bfd.drvPath->getBaseStorePath();
},
[&](const typename DP::Opaque & bo) -> auto & {
return bo.path;
},
}, derivedPath.raw());
}
const StorePath & SingleDerivedPath::getBaseStorePath() const
{
return getBaseStorePath_(*this);
}
const StorePath & DerivedPath::getBaseStorePath() const
{
return getBaseStorePath_(*this);
}
}

222
src/libstore/derived-path.hh
View file

@ -24,28 +24,37 @@ class Store;
struct DerivedPathOpaque {
StorePath path;
nlohmann::json toJSON(ref<Store> store) const;
std::string to_string(const Store & store) const;
static DerivedPathOpaque parse(const Store & store, std::string_view);
nlohmann::json toJSON(const Store & store) const;
GENERATE_CMP(DerivedPathOpaque, me->path);
};
struct SingleDerivedPath;
/**
* A derived path that is built from a derivation
* A single derived path that is built from a derivation
*
* Built derived paths are pair of a derivation and some output names.
* They are evaluated by building the derivation, and then replacing the
* output names with the resulting outputs.
*
* Note that does mean a derived store paths evaluates to multiple
* opaque paths, which is sort of icky as expressions are supposed to
* evaluate to single values. Perhaps this should have just a single
* output name.
* Built derived paths are pair of a derivation and an output name. They are
* evaluated by building the derivation, and then taking the resulting output
* path of the given output name.
*/
struct DerivedPathBuilt {
StorePath drvPath;
OutputsSpec outputs;
struct SingleDerivedPathBuilt {
ref<SingleDerivedPath> drvPath;
std::string output;
/**
* Get the store path this is ultimately derived from (by realising
* and projecting outputs).
*
* Note that this is *not* a property of the store object being
* referred to, but just of this path --- how we happened to be
* referring to that store object. In other words, this means this
* function breaks "referential transparency". It should therefore
* be used only with great care.
*/
const StorePath & getBaseStorePath() const;
/**
* Uses `^` as the separator
@ -57,11 +66,139 @@ struct DerivedPathBuilt {
std::string to_string_legacy(const Store & store) const;
/**
* The caller splits on the separator, so it works for both variants.
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static DerivedPathBuilt parse(const Store & store, std::string_view drvPath, std::string_view outputs);
nlohmann::json toJSON(ref<Store> store) const;
static SingleDerivedPathBuilt parse(
const Store & store, ref<SingleDerivedPath> drvPath,
std::string_view outputs,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
nlohmann::json toJSON(Store & store) const;
GENERATE_CMP(DerivedPathBuilt, me->drvPath, me->outputs);
DECLARE_CMP(SingleDerivedPathBuilt);
};
using _SingleDerivedPathRaw = std::variant<
DerivedPathOpaque,
SingleDerivedPathBuilt
>;
/**
* A "derived path" is a very simple sort of expression (not a Nix
* language expression! But an expression in a the general sense) that
* evaluates to (concrete) store path. It is either:
*
* - opaque, in which case it is just a concrete store path with
* possibly no known derivation
*
* - built, in which case it is a pair of a derivation path and an
* output name.
*/
struct SingleDerivedPath : _SingleDerivedPathRaw {
using Raw = _SingleDerivedPathRaw;
using Raw::Raw;
using Opaque = DerivedPathOpaque;
using Built = SingleDerivedPathBuilt;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
/**
* Get the store path this is ultimately derived from (by realising
* and projecting outputs).
*
* Note that this is *not* a property of the store object being
* referred to, but just of this path --- how we happened to be
* referring to that store object. In other words, this means this
* function breaks "referential transparency". It should therefore
* be used only with great care.
*/
const StorePath & getBaseStorePath() const;
/**
* Uses `^` as the separator
*/
std::string to_string(const Store & store) const;
/**
* Uses `!` as the separator
*/
std::string to_string_legacy(const Store & store) const;
/**
* Uses `^` as the separator
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static SingleDerivedPath parse(
const Store & store,
std::string_view,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
/**
* Uses `!` as the separator
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static SingleDerivedPath parseLegacy(
const Store & store,
std::string_view,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
nlohmann::json toJSON(Store & store) const;
};
static inline ref<SingleDerivedPath> makeConstantStorePathRef(StorePath drvPath)
{
return make_ref<SingleDerivedPath>(SingleDerivedPath::Opaque { drvPath });
}
/**
* A set of derived paths that are built from a derivation
*
* Built derived paths are pair of a derivation and some output names.
* They are evaluated by building the derivation, and then replacing the
* output names with the resulting outputs.
*
* Note that does mean a derived store paths evaluates to multiple
* opaque paths, which is sort of icky as expressions are supposed to
* evaluate to single values. Perhaps this should have just a single
* output name.
*/
struct DerivedPathBuilt {
ref<SingleDerivedPath> drvPath;
OutputsSpec outputs;
/**
* Get the store path this is ultimately derived from (by realising
* and projecting outputs).
*
* Note that this is *not* a property of the store object being
* referred to, but just of this path --- how we happened to be
* referring to that store object. In other words, this means this
* function breaks "referential transparency". It should therefore
* be used only with great care.
*/
const StorePath & getBaseStorePath() const;
/**
* Uses `^` as the separator
*/
std::string to_string(const Store & store) const;
/**
* Uses `!` as the separator
*/
std::string to_string_legacy(const Store & store) const;
/**
* The caller splits on the separator, so it works for both variants.
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static DerivedPathBuilt parse(
const Store & store, ref<SingleDerivedPath>,
std::string_view,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
nlohmann::json toJSON(Store & store) const;
DECLARE_CMP(DerivedPathBuilt);
};
using _DerivedPathRaw = std::variant<
@ -71,13 +208,13 @@ using _DerivedPathRaw = std::variant<
/**
* A "derived path" is a very simple sort of expression that evaluates
* to (concrete) store path. It is either:
* to one or more (concrete) store paths. It is either:
*
* - opaque, in which case it is just a concrete store path with
* - opaque, in which case it is just a single concrete store path with
* possibly no known derivation
*
* - built, in which case it is a pair of a derivation path and an
* output name.
* - built, in which case it is a pair of a derivation path and some
* output names.
*/
struct DerivedPath : _DerivedPathRaw {
using Raw = _DerivedPathRaw;
@ -90,6 +227,18 @@ struct DerivedPath : _DerivedPathRaw {
return static_cast<const Raw &>(*this);
}
/**
* Get the store path this is ultimately derived from (by realising
* and projecting outputs).
*
* Note that this is *not* a property of the store object being
* referred to, but just of this path --- how we happened to be
* referring to that store object. In other words, this means this
* function breaks "referential transparency". It should therefore
* be used only with great care.
*/
const StorePath & getBaseStorePath() const;
/**
* Uses `^` as the separator
*/
@ -100,14 +249,43 @@ struct DerivedPath : _DerivedPathRaw {
std::string to_string_legacy(const Store & store) const;
/**
* Uses `^` as the separator
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static DerivedPath parse(const Store & store, std::string_view);
static DerivedPath parse(
const Store & store,
std::string_view,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
/**
* Uses `!` as the separator
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static DerivedPath parseLegacy(const Store & store, std::string_view);
static DerivedPath parseLegacy(
const Store & store,
std::string_view,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
/**
* Convert a `SingleDerivedPath` to a `DerivedPath`.
*/
static DerivedPath fromSingle(const SingleDerivedPath &);
nlohmann::json toJSON(Store & store) const;
};
typedef std::vector<DerivedPath> DerivedPaths;
/**
* Used by various parser functions to require experimental features as
* needed.
*
* Somewhat unfortunate this cannot just be an implementation detail for
* this module.
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
void drvRequireExperiment(
const SingleDerivedPath & drv,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
}

15
src/libstore/downstream-placeholder.cc
View file

@ -38,4 +38,19 @@ DownstreamPlaceholder DownstreamPlaceholder::unknownDerivation(
};
}
DownstreamPlaceholder DownstreamPlaceholder::fromSingleDerivedPathBuilt(
const SingleDerivedPath::Built & b)
{
return std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & o) {
return DownstreamPlaceholder::unknownCaOutput(o.path, b.output);
},
[&](const SingleDerivedPath::Built & b2) {
return DownstreamPlaceholder::unknownDerivation(
DownstreamPlaceholder::fromSingleDerivedPathBuilt(b2),
b.output);
},
}, b.drvPath->raw());
}
}

12
src/libstore/downstream-placeholder.hh
View file

@ -3,6 +3,7 @@
#include "hash.hh"
#include "path.hh"
#include "derived-path.hh"
namespace nix {
@ -73,6 +74,17 @@ public:
const DownstreamPlaceholder & drvPlaceholder,
std::string_view outputName,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
/**
* Convenience constructor that handles both cases (unknown
* content-addressed output and unknown derivation), delegating as
* needed to `unknownCaOutput` and `unknownDerivation`.
*
* Recursively builds up a placeholder from a
* `SingleDerivedPath::Built.drvPath` chain.
*/
static DownstreamPlaceholder fromSingleDerivedPathBuilt(
const SingleDerivedPath::Built & built);
};
}

3
src/libstore/legacy-ssh-store.cc
View file

@ -358,6 +358,9 @@ public:
[&](const StorePath & drvPath) {
throw Error("wanted to fetch '%s' but the legacy ssh protocol doesn't support merely substituting drv files via the build paths command. It would build them instead. Try using ssh-ng://", printStorePath(drvPath));
},
[&](std::monostate) {
throw Error("wanted build derivation that is itself a build product, but the legacy ssh protocol doesn't support that. Try using ssh-ng://");
},
}, sOrDrvPath);
}
conn->to << ss;

85
src/libstore/misc.cc
View file

@ -132,7 +132,7 @@ void Store::queryMissing(const std::vector<DerivedPath> & targets,
}
for (auto & i : drv.inputDrvs)
pool.enqueue(std::bind(doPath, DerivedPath::Built { i.first, i.second }));
pool.enqueue(std::bind(doPath, DerivedPath::Built { makeConstantStorePathRef(i.first), i.second }));
};
auto checkOutput = [&](
@ -176,10 +176,18 @@ void Store::queryMissing(const std::vector<DerivedPath> & targets,
std::visit(overloaded {
[&](const DerivedPath::Built & bfd) {
if (!isValidPath(bfd.drvPath)) {
auto drvPathP = std::get_if<DerivedPath::Opaque>(&*bfd.drvPath);
if (!drvPathP) {
// TODO make work in this case.
warn("Ignoring dynamic derivation %s while querying missing paths; not yet implemented", bfd.drvPath->to_string(*this));
return;
}
auto & drvPath = drvPathP->path;
if (!isValidPath(drvPath)) {
// FIXME: we could try to substitute the derivation.
auto state(state_.lock());
state->unknown.insert(bfd.drvPath);
state->unknown.insert(drvPath);
return;
}
@ -187,7 +195,7 @@ void Store::queryMissing(const std::vector<DerivedPath> & targets,
/* true for regular derivations, and CA derivations for which we
have a trust mapping for all wanted outputs. */
auto knownOutputPaths = true;
for (auto & [outputName, pathOpt] : queryPartialDerivationOutputMap(bfd.drvPath)) {
for (auto & [outputName, pathOpt] : queryPartialDerivationOutputMap(drvPath)) {
if (!pathOpt) {
knownOutputPaths = false;
break;
@ -197,15 +205,15 @@ void Store::queryMissing(const std::vector<DerivedPath> & targets,
}
if (knownOutputPaths && invalid.empty()) return;
auto drv = make_ref<Derivation>(derivationFromPath(bfd.drvPath));
ParsedDerivation parsedDrv(StorePath(bfd.drvPath), *drv);
auto drv = make_ref<Derivation>(derivationFromPath(drvPath));
ParsedDerivation parsedDrv(StorePath(drvPath), *drv);
if (knownOutputPaths && settings.useSubstitutes && parsedDrv.substitutesAllowed()) {
auto drvState = make_ref<Sync<DrvState>>(DrvState(invalid.size()));
for (auto & output : invalid)
pool.enqueue(std::bind(checkOutput, bfd.drvPath, drv, output, drvState));
pool.enqueue(std::bind(checkOutput, drvPath, drv, output, drvState));
} else
mustBuildDrv(bfd.drvPath, *drv);
mustBuildDrv(drvPath, *drv);
},
[&](const DerivedPath::Opaque & bo) {
@ -310,7 +318,9 @@ std::map<DrvOutput, StorePath> drvOutputReferences(
OutputPathMap resolveDerivedPath(Store & store, const DerivedPath::Built & bfd, Store * evalStore_)
{
auto outputsOpt_ = store.queryPartialDerivationOutputMap(bfd.drvPath, evalStore_);
auto drvPath = resolveDerivedPath(store, *bfd.drvPath, evalStore_);
auto outputsOpt_ = store.queryPartialDerivationOutputMap(drvPath, evalStore_);
auto outputsOpt = std::visit(overloaded {
[&](const OutputsSpec::All &) {
@ -325,7 +335,7 @@ OutputPathMap resolveDerivedPath(Store & store, const DerivedPath::Built & bfd,
if (!pOutputPathOpt)
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store.printStorePath(bfd.drvPath), output);
bfd.drvPath->to_string(store), output);
outputsOpt.insert_or_assign(output, std::move(*pOutputPathOpt));
}
return outputsOpt;
@ -335,11 +345,64 @@ OutputPathMap resolveDerivedPath(Store & store, const DerivedPath::Built & bfd,
OutputPathMap outputs;
for (auto & [outputName, outputPathOpt] : outputsOpt) {
if (!outputPathOpt)
throw MissingRealisation(store.printStorePath(bfd.drvPath), outputName);
throw MissingRealisation(bfd.drvPath->to_string(store), outputName);
auto & outputPath = *outputPathOpt;
outputs.insert_or_assign(outputName, outputPath);
}
return outputs;
}
StorePath resolveDerivedPath(Store & store, const SingleDerivedPath & req, Store * evalStore_)
{
auto & evalStore = evalStore_ ? *evalStore_ : store;
return std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & bo) {
return bo.path;
},
[&](const SingleDerivedPath::Built & bfd) {
auto drvPath = resolveDerivedPath(store, *bfd.drvPath, evalStore_);
auto outputPaths = evalStore.queryPartialDerivationOutputMap(drvPath, evalStore_);
if (outputPaths.count(bfd.output) == 0)
throw Error("derivation '%s' does not have an output named '%s'",
store.printStorePath(drvPath), bfd.output);
auto & optPath = outputPaths.at(bfd.output);
if (!optPath)
throw Error("'%s' does not yet map to a known concrete store path",
bfd.to_string(store));
return *optPath;
},
}, req.raw());
}
OutputPathMap resolveDerivedPath(Store & store, const DerivedPath::Built & bfd)
{
auto drvPath = resolveDerivedPath(store, *bfd.drvPath);
auto outputMap = store.queryDerivationOutputMap(drvPath);
auto outputsLeft = std::visit(overloaded {
[&](const OutputsSpec::All &) {
return StringSet {};
},
[&](const OutputsSpec::Names & names) {
return static_cast<StringSet>(names);
},
}, bfd.outputs.raw());
for (auto iter = outputMap.begin(); iter != outputMap.end();) {
auto & outputName = iter->first;
if (bfd.outputs.contains(outputName)) {
outputsLeft.erase(outputName);
++iter;
} else {
iter = outputMap.erase(iter);
}
}
if (!outputsLeft.empty())
throw Error("derivation '%s' does not have an outputs %s",
store.printStorePath(drvPath),
concatStringsSep(", ", quoteStrings(std::get<OutputsSpec::Names>(bfd.outputs))));
return outputMap;
}
}

47
src/libstore/path-with-outputs.cc
View file

@ -16,10 +16,16 @@ std::string StorePathWithOutputs::to_string(const Store & store) const
DerivedPath StorePathWithOutputs::toDerivedPath() const
{
if (!outputs.empty()) {
return DerivedPath::Built { path, OutputsSpec::Names { outputs } };
return DerivedPath::Built {
.drvPath = makeConstantStorePathRef(path),
.outputs = OutputsSpec::Names { outputs },
};
} else if (path.isDerivation()) {
assert(outputs.empty());
return DerivedPath::Built { path, OutputsSpec::All { } };
return DerivedPath::Built {
.drvPath = makeConstantStorePathRef(path),
.outputs = OutputsSpec::All { },
};
} else {
return DerivedPath::Opaque { path };
}
@ -34,29 +40,36 @@ std::vector<DerivedPath> toDerivedPaths(const std::vector<StorePathWithOutputs>
}
std::variant<StorePathWithOutputs, StorePath> StorePathWithOutputs::tryFromDerivedPath(const DerivedPath & p)
StorePathWithOutputs::ParseResult StorePathWithOutputs::tryFromDerivedPath(const DerivedPath & p)
{
return std::visit(overloaded {
[&](const DerivedPath::Opaque & bo) -> std::variant<StorePathWithOutputs, StorePath> {
[&](const DerivedPath::Opaque & bo) -> StorePathWithOutputs::ParseResult {
if (bo.path.isDerivation()) {
// drv path gets interpreted as "build", not "get drv file itself"
return bo.path;
}
return StorePathWithOutputs { bo.path };
},
[&](const DerivedPath::Built & bfd) -> std::variant<StorePathWithOutputs, StorePath> {
return StorePathWithOutputs {
.path = bfd.drvPath,
// Use legacy encoding of wildcard as empty set
.outputs = std::visit(overloaded {
[&](const OutputsSpec::All &) -> StringSet {
return {};
},
[&](const OutputsSpec::Names & outputs) {
return static_cast<StringSet>(outputs);
},
}, bfd.outputs.raw()),
};
[&](const DerivedPath::Built & bfd) -> StorePathWithOutputs::ParseResult {
return std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & bo) -> StorePathWithOutputs::ParseResult {
return StorePathWithOutputs {
.path = bo.path,
// Use legacy encoding of wildcard as empty set
.outputs = std::visit(overloaded {
[&](const OutputsSpec::All &) -> StringSet {
return {};
},
[&](const OutputsSpec::Names & outputs) {
return static_cast<StringSet>(outputs);
},
}, bfd.outputs.raw()),
};
},
[&](const SingleDerivedPath::Built &) -> StorePathWithOutputs::ParseResult {
return std::monostate {};
},
}, bfd.drvPath->raw());
},
}, p.raw());
}

4
src/libstore/path-with-outputs.hh
View file

@ -23,7 +23,9 @@ struct StorePathWithOutputs
DerivedPath toDerivedPath() const;
static std::variant<StorePathWithOutputs, StorePath> tryFromDerivedPath(const DerivedPath &);
typedef std::variant<StorePathWithOutputs, StorePath, std::monostate> ParseResult;
static StorePathWithOutputs::ParseResult tryFromDerivedPath(const DerivedPath &);
};
std::vector<DerivedPath> toDerivedPaths(const std::vector<StorePathWithOutputs>);

21
src/libstore/remote-store.cc
View file

@ -656,6 +656,9 @@ static void writeDerivedPaths(RemoteStore & store, RemoteStore::Connection & con
GET_PROTOCOL_MAJOR(conn.daemonVersion),
GET_PROTOCOL_MINOR(conn.daemonVersion));
},
[&](std::monostate) {
throw Error("wanted to build a derivation that is itself a build product, but the legacy 'ssh://' protocol doesn't support that. Try using 'ssh-ng://'");
},
}, sOrDrvPath);
}
conn.to << ss;
@ -670,9 +673,16 @@ void RemoteStore::copyDrvsFromEvalStore(
/* The remote doesn't have a way to access evalStore, so copy
the .drvs. */
RealisedPath::Set drvPaths2;
for (auto & i : paths)
if (auto p = std::get_if<DerivedPath::Built>(&i))
drvPaths2.insert(p->drvPath);
for (const auto & i : paths) {
std::visit(overloaded {
[&](const DerivedPath::Opaque & bp) {
// Do nothing, path is hopefully there already
},
[&](const DerivedPath::Built & bp) {
drvPaths2.insert(bp.drvPath->getBaseStorePath());
},
}, i.raw());
}
copyClosure(*evalStore, *this, drvPaths2);
}
}
@ -742,7 +752,8 @@ std::vector<KeyedBuildResult> RemoteStore::buildPathsWithResults(
};
OutputPathMap outputs;
auto drv = evalStore->readDerivation(bfd.drvPath);
auto drvPath = resolveDerivedPath(*evalStore, *bfd.drvPath);
auto drv = evalStore->readDerivation(drvPath);
const auto outputHashes = staticOutputHashes(*evalStore, drv); // FIXME: expensive
auto built = resolveDerivedPath(*this, bfd, &*evalStore);
for (auto & [output, outputPath] : built) {
@ -750,7 +761,7 @@ std::vector<KeyedBuildResult> RemoteStore::buildPathsWithResults(
if (!outputHash)
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
printStorePath(bfd.drvPath), output);
printStorePath(drvPath), output);
auto outputId = DrvOutput{ *outputHash, output };
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
auto realisation =

1
src/libstore/store-api.hh
View file

@ -945,6 +945,7 @@ void removeTempRoots();
* Resolve the derived path completely, failing if any derivation output
* is unknown.
*/
StorePath resolveDerivedPath(Store &, const SingleDerivedPath &, Store * evalStore = nullptr);
OutputPathMap resolveDerivedPath(Store &, const DerivedPath::Built &, Store * evalStore = nullptr);

91
src/libstore/tests/derived-path.cc
View file

@ -17,14 +17,34 @@ Gen<DerivedPath::Opaque> Arbitrary<DerivedPath::Opaque>::arbitrary()
});
}
Gen<SingleDerivedPath::Built> Arbitrary<SingleDerivedPath::Built>::arbitrary()
{
return gen::just(SingleDerivedPath::Built {
.drvPath = make_ref<SingleDerivedPath>(*gen::arbitrary<SingleDerivedPath>()),
.output = (*gen::arbitrary<StorePathName>()).name,
});
}
Gen<DerivedPath::Built> Arbitrary<DerivedPath::Built>::arbitrary()
{
return gen::just(DerivedPath::Built {
.drvPath = *gen::arbitrary<StorePath>(),
.drvPath = make_ref<SingleDerivedPath>(*gen::arbitrary<SingleDerivedPath>()),
.outputs = *gen::arbitrary<OutputsSpec>(),
});
}
Gen<SingleDerivedPath> Arbitrary<SingleDerivedPath>::arbitrary()
{
switch (*gen::inRange<uint8_t>(0, std::variant_size_v<SingleDerivedPath::Raw>)) {
case 0:
return gen::just<SingleDerivedPath>(*gen::arbitrary<SingleDerivedPath::Opaque>());
case 1:
return gen::just<SingleDerivedPath>(*gen::arbitrary<SingleDerivedPath::Built>());
default:
assert(false);
}
}
Gen<DerivedPath> Arbitrary<DerivedPath>::arbitrary()
{
switch (*gen::inRange<uint8_t>(0, std::variant_size_v<DerivedPath::Raw>)) {
@ -45,12 +65,69 @@ class DerivedPathTest : public LibStoreTest
{
};
// FIXME: `RC_GTEST_FIXTURE_PROP` isn't calling `SetUpTestSuite` because it is
// no a real fixture.
//
// See https://github.com/emil-e/rapidcheck/blob/master/doc/gtest.md#rc_gtest_fixture_propfixture-name-args
TEST_F(DerivedPathTest, force_init)
{
/**
* Round trip (string <-> data structure) test for
* `DerivedPath::Opaque`.
*/
TEST_F(DerivedPathTest, opaque) {
std::string_view opaque = "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x";
auto elem = DerivedPath::parse(*store, opaque);
auto * p = std::get_if<DerivedPath::Opaque>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->path, store->parseStorePath(opaque));
ASSERT_EQ(elem.to_string(*store), opaque);
}
/**
* Round trip (string <-> data structure) test for a simpler
* `DerivedPath::Built`.
*/
TEST_F(DerivedPathTest, built_opaque) {
std::string_view built = "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv^bar,foo";
auto elem = DerivedPath::parse(*store, built);
auto * p = std::get_if<DerivedPath::Built>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->outputs, ((OutputsSpec) OutputsSpec::Names { "foo", "bar" }));
ASSERT_EQ(*p->drvPath, ((SingleDerivedPath) SingleDerivedPath::Opaque {
.path = store->parseStorePath(built.substr(0, 49)),
}));
ASSERT_EQ(elem.to_string(*store), built);
}
/**
* Round trip (string <-> data structure) test for a more complex,
* inductive `DerivedPath::Built`.
*/
TEST_F(DerivedPathTest, built_built) {
/**
* We set these in tests rather than the regular globals so we don't have
* to worry about race conditions if the tests run concurrently.
*/
ExperimentalFeatureSettings mockXpSettings;
mockXpSettings.set("experimental-features", "dynamic-derivations ca-derivations");
std::string_view built = "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv^foo^bar,baz";
auto elem = DerivedPath::parse(*store, built, mockXpSettings);
auto * p = std::get_if<DerivedPath::Built>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->outputs, ((OutputsSpec) OutputsSpec::Names { "bar", "baz" }));
auto * drvPath = std::get_if<SingleDerivedPath::Built>(&*p->drvPath);
ASSERT_TRUE(drvPath);
ASSERT_EQ(drvPath->output, "foo");
ASSERT_EQ(*drvPath->drvPath, ((SingleDerivedPath) SingleDerivedPath::Opaque {
.path = store->parseStorePath(built.substr(0, 49)),
}));
ASSERT_EQ(elem.to_string(*store), built);
}
/**
* Without the right experimental features enabled, we cannot parse a
* complex inductive derived path.
*/
TEST_F(DerivedPathTest, built_built_xp) {
ASSERT_THROW(
DerivedPath::parse(*store, "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv^foo^bar,baz"),
MissingExperimentalFeature);
}
RC_GTEST_FIXTURE_PROP(

14
src/libstore/tests/derived-path.hh
View file

@ -12,8 +12,18 @@ namespace rc {
using namespace nix;
template<>
struct Arbitrary<DerivedPath::Opaque> {
static Gen<DerivedPath::Opaque> arbitrary();
struct Arbitrary<SingleDerivedPath::Opaque> {
static Gen<SingleDerivedPath::Opaque> arbitrary();
};
template<>
struct Arbitrary<SingleDerivedPath::Built> {
static Gen<SingleDerivedPath::Built> arbitrary();
};
template<>
struct Arbitrary<SingleDerivedPath> {
static Gen<SingleDerivedPath> arbitrary();
};
template<>

16
src/libutil/comparator.hh
View file

@ -1,6 +1,22 @@
#pragma once
///@file
/**
* Declare comparison methods without defining them.
*/
#define DECLARE_ONE_CMP(COMPARATOR, MY_TYPE) \
bool operator COMPARATOR(const MY_TYPE & other) const;
#define DECLARE_EQUAL(my_type) \
DECLARE_ONE_CMP(==, my_type)
#define DECLARE_LEQ(my_type) \
DECLARE_ONE_CMP(<, my_type)
#define DECLARE_NEQ(my_type) \
DECLARE_ONE_CMP(!=, my_type)
#define DECLARE_CMP(my_type) \
DECLARE_EQUAL(my_type) \
DECLARE_LEQ(my_type) \
DECLARE_NEQ(my_type)
/**
* Awful hacky generation of the comparison operators by doing a lexicographic
* comparison between the choosen fields.

9
src/nix-build/nix-build.cc
View file

@ -393,7 +393,7 @@ static void main_nix_build(int argc, char * * argv)
auto bashDrv = drv->requireDrvPath();
pathsToBuild.push_back(DerivedPath::Built {
.drvPath = bashDrv,
.drvPath = makeConstantStorePathRef(bashDrv),
.outputs = OutputsSpec::Names {"out"},
});
pathsToCopy.insert(bashDrv);
@ -417,7 +417,7 @@ static void main_nix_build(int argc, char * * argv)
}))
{
pathsToBuild.push_back(DerivedPath::Built {
.drvPath = inputDrv,
.drvPath = makeConstantStorePathRef(inputDrv),
.outputs = OutputsSpec::Names { inputOutputs },
});
pathsToCopy.insert(inputDrv);
@ -590,7 +590,10 @@ static void main_nix_build(int argc, char * * argv)
if (outputName == "")
throw Error("derivation '%s' lacks an 'outputName' attribute", store->printStorePath(drvPath));
pathsToBuild.push_back(DerivedPath::Built{drvPath, OutputsSpec::Names{outputName}});
pathsToBuild.push_back(DerivedPath::Built{
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::Names{outputName},
});
pathsToBuildOrdered.push_back({drvPath, {outputName}});
drvsToCopy.insert(drvPath);

4
src/nix-env/nix-env.cc
View file

@ -481,7 +481,7 @@ static void printMissing(EvalState & state, DrvInfos & elems)
for (auto & i : elems)
if (auto drvPath = i.queryDrvPath())
targets.push_back(DerivedPath::Built{
.drvPath = *drvPath,
.drvPath = makeConstantStorePathRef(*drvPath),
.outputs = OutputsSpec::All { },
});
else
@ -759,7 +759,7 @@ static void opSet(Globals & globals, Strings opFlags, Strings opArgs)
std::vector<DerivedPath> paths {
drvPath
? (DerivedPath) (DerivedPath::Built {
.drvPath = *drvPath,
.drvPath = makeConstantStorePathRef(*drvPath),
.outputs = OutputsSpec::All { },
})
: (DerivedPath) (DerivedPath::Opaque {

7
src/nix/app.cc
View file

@ -25,7 +25,8 @@ StringPairs resolveRewrites(
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations))
for (auto & [ outputName, outputPath ] : drvDep->outputs)
res.emplace(
DownstreamPlaceholder::unknownCaOutput(drvDep->drvPath, outputName).render(),
DownstreamPlaceholder::unknownCaOutput(
drvDep->drvPath->outPath(), outputName).render(),
store.printStorePath(outputPath)
);
return res;
@ -65,7 +66,7 @@ UnresolvedApp InstallableValue::toApp(EvalState & state)
[&](const NixStringContextElem::DrvDeep & d) -> DerivedPath {
/* We want all outputs of the drv */
return DerivedPath::Built {
.drvPath = d.drvPath,
.drvPath = makeConstantStorePathRef(d.drvPath),
.outputs = OutputsSpec::All {},
};
},
@ -106,7 +107,7 @@ UnresolvedApp InstallableValue::toApp(EvalState & state)
auto program = outPath + "/bin/" + mainProgram;
return UnresolvedApp { App {
.context = { DerivedPath::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::Names { outputName },
} },
.program = program,

10
src/nix/build.cc
View file

@ -9,18 +9,18 @@
using namespace nix;
nlohmann::json derivedPathsToJSON(const DerivedPaths & paths, ref<Store> store)
static nlohmann::json derivedPathsToJSON(const DerivedPaths & paths, Store & store)
{
auto res = nlohmann::json::array();
for (auto & t : paths) {
std::visit([&res, store](const auto & t) {
std::visit([&](const auto & t) {
res.push_back(t.toJSON(store));
}, t.raw());
}
return res;
}
nlohmann::json builtPathsWithResultToJSON(const std::vector<BuiltPathWithResult> & buildables, ref<Store> store)
static nlohmann::json builtPathsWithResultToJSON(const std::vector<BuiltPathWithResult> & buildables, const Store & store)
{
auto res = nlohmann::json::array();
for (auto & b : buildables) {
@ -125,7 +125,7 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixJSON, MixProfile
printMissing(store, pathsToBuild, lvlError);
if (json)
logger->cout("%s", derivedPathsToJSON(pathsToBuild, store).dump());
logger->cout("%s", derivedPathsToJSON(pathsToBuild, *store).dump());
return;
}
@ -136,7 +136,7 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixJSON, MixProfile
installables,
repair ? bmRepair : buildMode);
if (json) logger->cout("%s", builtPathsWithResultToJSON(buildables, store).dump());
if (json) logger->cout("%s", builtPathsWithResultToJSON(buildables, *store).dump());
if (outLink != "")
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>())

2
src/nix/bundle.cc
View file

@ -109,7 +109,7 @@ struct CmdBundle : InstallableValueCommand
store->buildPaths({
DerivedPath::Built {
.drvPath = drvPath,
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::All { },
},
});

2
src/nix/develop.cc
View file

@ -235,7 +235,7 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
/* Build the derivation. */
store->buildPaths(
{ DerivedPath::Built {
.drvPath = shellDrvPath,
.drvPath = makeConstantStorePathRef(shellDrvPath),
.outputs = OutputsSpec::All { },
}},
bmNormal, evalStore);

6
src/nix/flake.cc
View file

@ -544,9 +544,9 @@ struct CmdFlakeCheck : FlakeCommand
*attr2.value, attr2.pos);
if (drvPath && attr_name == settings.thisSystem.get()) {
drvPaths.push_back(DerivedPath::Built {
.drvPath = *drvPath,
.outputs = OutputsSpec::All { },
});
.drvPath = makeConstantStorePathRef(*drvPath),
.outputs = OutputsSpec::All { },
});
}
}
}

20
src/nix/log.cc
View file

@ -33,6 +33,17 @@ struct CmdLog : InstallableCommand
auto b = installable->toDerivedPath();
// For compat with CLI today, TODO revisit
auto oneUp = std::visit(overloaded {
[&](const DerivedPath::Opaque & bo) {
return make_ref<SingleDerivedPath>(bo);
},
[&](const DerivedPath::Built & bfd) {
return bfd.drvPath;
},
}, b.path.raw());
auto path = resolveDerivedPath(*store, *oneUp);
RunPager pager;
for (auto & sub : subs) {
auto * logSubP = dynamic_cast<LogStore *>(&*sub);
@ -42,14 +53,7 @@ struct CmdLog : InstallableCommand
}
auto & logSub = *logSubP;
auto log = std::visit(overloaded {
[&](const DerivedPath::Opaque & bo) {
return logSub.getBuildLog(bo.path);
},
[&](const DerivedPath::Built & bfd) {
return logSub.getBuildLog(bfd.drvPath);
},
}, b.path.raw());
auto log = logSub.getBuildLog(path);
if (!log) continue;
stopProgressBar();
printInfo("got build log for '%s' from '%s'", installable->what(), logSub.getUri());

2
tests/build.sh
View file

@ -78,7 +78,7 @@ expectStderr 1 nix build --impure --expr 'with (import ./multiple-outputs.nix).e
| grepQuiet "has 2 entries in its context. It should only have exactly one entry"
nix build --impure --json --expr 'builtins.unsafeDiscardOutputDependency (import ./multiple-outputs.nix).e.a_a.drvPath' --no-link | jq --exit-status '
(.[0] | .path | match(".*multiple-outputs-e.drv"))
(.[0] | match(".*multiple-outputs-e.drv"))
'
# Test building from raw store path to drv not expression.

21
tests/dyn-drv/build-built-drv.sh Normal file
View file

@ -0,0 +1,21 @@
#!/usr/bin/env bash
source common.sh
# In the corresponding nix file, we have two derivations: the first, named `hello`,
# is a normal recursive derivation, while the second, named dependent, has the
# new outputHashMode "text". Note that in "dependent", we don't refer to the
# build output of `hello`, but only to the path of the drv file. For this reason,
# we only need to:
#
# - instantiate `hello`
# - build `producingDrv`
# - check that the path of the output coincides with that of the original derivation
out1=$(nix build -f ./text-hashed-output.nix hello --no-link)
clearStore
drvDep=$(nix-instantiate ./text-hashed-output.nix -A producingDrv)
expectStderr 1 nix build "${drvDep}^out^out" --no-link | grepQuiet "Building dynamic derivations in one shot is not yet implemented"

3
tests/dyn-drv/local.mk
View file

@ -1,6 +1,7 @@
dyn-drv-tests := \
$(d)/text-hashed-output.sh \
$(d)/recursive-mod-json.sh
$(d)/recursive-mod-json.sh \
$(d)/build-built-drv.sh
install-tests-groups += dyn-drv

2
tests/test-libstoreconsumer/main.cc
View file

@ -23,7 +23,7 @@ int main (int argc, char **argv)
std::vector<DerivedPath> paths {
DerivedPath::Built {
.drvPath = store->parseStorePath(drvPath),
.drvPath = makeConstantStorePathRef(store->parseStorePath(drvPath)),
.outputs = OutputsSpec::Names{"out"}
}
};