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libstore: hide Worker goal factory methods

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this doesn't serve a great purpose yet except to confine construction of
goals to the stack frame of Worker::run() and its child frames. we don't
need this yet (and the goal constructors remain fully visible), but in a
future change that fully removes the current worker loop we'll need some
way of knowing which goals are top-level goals without passing the goals
themselves around. once that's possible we can remove visible goals as a
concept and rely on build result futures and a scheduler built upon them

Change-Id: Ia73cdeffcfb9ba1ce9d69b702dc0bc637a4c4ce6
This commit is contained in:
eldritch horrors 2024-08-29 21:06:30 +02:00
parent a5c1e73fa8
commit 869666cb65
6 changed files with 106 additions and 49 deletions
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16
src/libstore/build/derivation-goal.cc
View file

@ -170,7 +170,7 @@ Goal::WorkResult DerivationGoal::getDerivation(bool inBuildSlot)
state = &DerivationGoal::loadDerivation;
return WaitForGoals{{worker.makePathSubstitutionGoal(drvPath)}};
return WaitForGoals{{worker.goalFactory().makePathSubstitutionGoal(drvPath)}};
}
@ -268,14 +268,14 @@ Goal::WorkResult DerivationGoal::haveDerivation(bool inBuildSlot)
if (!status.wanted) continue;
if (!status.known)
result.goals.insert(
worker.makeDrvOutputSubstitutionGoal(
worker.goalFactory().makeDrvOutputSubstitutionGoal(
DrvOutput{status.outputHash, outputName},
buildMode == bmRepair ? Repair : NoRepair
)
);
else {
auto * cap = getDerivationCA(*drv);
result.goals.insert(worker.makePathSubstitutionGoal(
result.goals.insert(worker.goalFactory().makePathSubstitutionGoal(
status.known->path,
buildMode == bmRepair ? Repair : NoRepair,
cap ? std::optional { *cap } : std::nullopt));
@ -374,7 +374,7 @@ Goal::WorkResult DerivationGoal::gaveUpOnSubstitution(bool inBuildSlot)
addWaiteeDerivedPath = [&](ref<SingleDerivedPath> inputDrv, const DerivedPathMap<StringSet>::ChildNode & inputNode) {
if (!inputNode.value.empty())
result.goals.insert(worker.makeGoal(
result.goals.insert(worker.goalFactory().makeGoal(
DerivedPath::Built {
.drvPath = inputDrv,
.outputs = inputNode.value,
@ -419,7 +419,7 @@ Goal::WorkResult DerivationGoal::gaveUpOnSubstitution(bool inBuildSlot)
if (!settings.useSubstitutes)
throw Error("dependency '%s' of '%s' does not exist, and substitution is disabled",
worker.store.printStorePath(i), worker.store.printStorePath(drvPath));
result.goals.insert(worker.makePathSubstitutionGoal(i));
result.goals.insert(worker.goalFactory().makePathSubstitutionGoal(i));
}
if (result.goals.empty()) {/* to prevent hang (no wake-up event) */
@ -475,9 +475,9 @@ Goal::WorkResult DerivationGoal::repairClosure()
worker.store.printStorePath(i), worker.store.printStorePath(drvPath));
auto drvPath2 = outputsToDrv.find(i);
if (drvPath2 == outputsToDrv.end())
result.goals.insert(worker.makePathSubstitutionGoal(i, Repair));
result.goals.insert(worker.goalFactory().makePathSubstitutionGoal(i, Repair));
else
result.goals.insert(worker.makeGoal(
result.goals.insert(worker.goalFactory().makeGoal(
DerivedPath::Built {
.drvPath = makeConstantStorePathRef(drvPath2->second),
.outputs = OutputsSpec::All { },
@ -580,7 +580,7 @@ Goal::WorkResult DerivationGoal::inputsRealised(bool inBuildSlot)
worker.store.printStorePath(pathResolved),
});
resolvedDrvGoal = worker.makeDerivationGoal(
resolvedDrvGoal = worker.goalFactory().makeDerivationGoal(
pathResolved, wantedOutputs, buildMode);
state = &DerivationGoal::resolvedFinished;

4
src/libstore/build/drv-output-substitution-goal.cc
View file

@ -112,11 +112,11 @@ Goal::WorkResult DrvOutputSubstitutionGoal::realisationFetched(bool inBuildSlot)
);
return tryNext(inBuildSlot);
}
result.goals.insert(worker.makeDrvOutputSubstitutionGoal(depId));
result.goals.insert(worker.goalFactory().makeDrvOutputSubstitutionGoal(depId));
}
}
result.goals.insert(worker.makePathSubstitutionGoal(outputInfo->outPath));
result.goals.insert(worker.goalFactory().makePathSubstitutionGoal(outputInfo->outPath));
if (result.goals.empty()) {
return outPathValid(inBuildSlot);

47
src/libstore/build/entry-points.cc
View file

@ -10,11 +10,12 @@ void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMod
{
Worker worker(*this, evalStore ? *evalStore : *this);
auto goals = worker.run([&](GoalFactory & gf) {
Goals goals;
for (auto & br : reqs)
goals.insert(worker.makeGoal(br, buildMode));
worker.run(goals);
goals.insert(gf.makeGoal(br, buildMode));
return goals;
});
StringSet failed;
std::shared_ptr<Error> ex;
@ -48,17 +49,17 @@ std::vector<KeyedBuildResult> Store::buildPathsWithResults(
std::shared_ptr<Store> evalStore)
{
Worker worker(*this, evalStore ? *evalStore : *this);
Goals goals;
std::vector<std::pair<const DerivedPath &, GoalPtr>> state;
auto goals = worker.run([&](GoalFactory & gf) {
Goals goals;
for (const auto & req : reqs) {
auto goal = worker.makeGoal(req, buildMode);
auto goal = gf.makeGoal(req, buildMode);
goals.insert(goal);
state.push_back({req, goal});
}
worker.run(goals);
return goals;
});
std::vector<KeyedBuildResult> results;
@ -72,10 +73,12 @@ BuildResult Store::buildDerivation(const StorePath & drvPath, const BasicDerivat
BuildMode buildMode)
{
Worker worker(*this, *this);
auto goal = worker.makeBasicDerivationGoal(drvPath, drv, OutputsSpec::All {}, buildMode);
try {
worker.run(Goals{goal});
auto goals = worker.run([&](GoalFactory & gf) -> Goals {
return Goals{gf.makeBasicDerivationGoal(drvPath, drv, OutputsSpec::All{}, buildMode)};
});
auto goal = *goals.begin();
return goal->buildResult.restrictTo(DerivedPath::Built {
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::All {},
@ -95,10 +98,10 @@ void Store::ensurePath(const StorePath & path)
if (isValidPath(path)) return;
Worker worker(*this, *this);
GoalPtr goal = worker.makePathSubstitutionGoal(path);
Goals goals = {goal};
worker.run(goals);
auto goals =
worker.run([&](GoalFactory & gf) { return Goals{gf.makePathSubstitutionGoal(path)}; });
auto goal = *goals.begin();
if (goal->exitCode != Goal::ecSuccess) {
if (goal->ex) {
@ -113,23 +116,27 @@ void Store::ensurePath(const StorePath & path)
void Store::repairPath(const StorePath & path)
{
Worker worker(*this, *this);
GoalPtr goal = worker.makePathSubstitutionGoal(path, Repair);
Goals goals = {goal};
worker.run(goals);
auto goals = worker.run([&](GoalFactory & gf) {
return Goals{gf.makePathSubstitutionGoal(path, Repair)};
});
auto goal = *goals.begin();
if (goal->exitCode != Goal::ecSuccess) {
/* Since substituting the path didn't work, if we have a valid
deriver, then rebuild the deriver. */
auto info = queryPathInfo(path);
if (info->deriver && isValidPath(*info->deriver)) {
goals.clear();
goals.insert(worker.makeGoal(DerivedPath::Built {
worker.run([&](GoalFactory & gf) {
return Goals{gf.makeGoal(
DerivedPath::Built{
.drvPath = makeConstantStorePathRef(*info->deriver),
// FIXME: Should just build the specific output we need.
.outputs = OutputsSpec::All{},
}, bmRepair));
worker.run(goals);
},
bmRepair
)};
});
} else
throw Error(worker.failingExitStatus(), "cannot repair path '%s'", printStorePath(path));
}

2
src/libstore/build/substitution-goal.cc
View file

@ -161,7 +161,7 @@ Goal::WorkResult PathSubstitutionGoal::tryNext(bool inBuildSlot)
WaitForGoals result;
for (auto & i : info->references)
if (i != storePath) /* ignore self-references */
result.goals.insert(worker.makePathSubstitutionGoal(i));
result.goals.insert(worker.goalFactory().makePathSubstitutionGoal(i));
if (result.goals.empty()) {/* to prevent hang (no wake-up event) */
return referencesValid(inBuildSlot);

5
src/libstore/build/worker.cc
View file

@ -326,8 +326,9 @@ void Worker::waitForAWhile(GoalPtr goal)
}
void Worker::run(const Goals & _topGoals)
Goals Worker::run(std::function<Goals (GoalFactory &)> req)
{
auto _topGoals = req(goalFactory());
std::vector<nix::DerivedPath> topPaths;
assert(!running);
@ -411,6 +412,8 @@ void Worker::run(const Goals & _topGoals)
assert(!settings.keepGoing || awake.empty());
assert(!settings.keepGoing || wantingToBuild.empty());
assert(!settings.keepGoing || children.empty());
return _topGoals;
}
void Worker::waitForInput()

63
src/libstore/build/worker.hh
View file

@ -40,10 +40,57 @@ struct Child
/* Forward definition. */
struct HookInstance;
class GoalFactory
{
public:
virtual std::shared_ptr<DerivationGoal> makeDerivationGoal(
const StorePath & drvPath, const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal
) = 0;
virtual std::shared_ptr<DerivationGoal> makeBasicDerivationGoal(
const StorePath & drvPath,
const BasicDerivation & drv,
const OutputsSpec & wantedOutputs,
BuildMode buildMode = bmNormal
) = 0;
/**
* @ref SubstitutionGoal "substitution goal"
*/
virtual std::shared_ptr<PathSubstitutionGoal> makePathSubstitutionGoal(
const StorePath & storePath,
RepairFlag repair = NoRepair,
std::optional<ContentAddress> ca = std::nullopt
) = 0;
virtual std::shared_ptr<DrvOutputSubstitutionGoal> makeDrvOutputSubstitutionGoal(
const DrvOutput & id,
RepairFlag repair = NoRepair,
std::optional<ContentAddress> ca = std::nullopt
) = 0;
/**
* Make a goal corresponding to the `DerivedPath`.
*
* It will be a `DerivationGoal` for a `DerivedPath::Built` or
* a `SubstitutionGoal` for a `DerivedPath::Opaque`.
*/
virtual GoalPtr makeGoal(const DerivedPath & req, BuildMode buildMode = bmNormal) = 0;
};
// elaborate hoax to let goals access factory methods while hiding them from the public
class WorkerBase : protected GoalFactory
{
friend struct DerivationGoal;
friend struct PathSubstitutionGoal;
friend class DrvOutputSubstitutionGoal;
protected:
GoalFactory & goalFactory() { return *this; }
};
/**
* The worker class.
*/
class Worker
class Worker : public WorkerBase
{
private:
@ -215,19 +262,18 @@ private:
std::shared_ptr<DerivationGoal> makeDerivationGoalCommon(
const StorePath & drvPath, const OutputsSpec & wantedOutputs,
std::function<std::shared_ptr<DerivationGoal>()> mkDrvGoal);
public:
std::shared_ptr<DerivationGoal> makeDerivationGoal(
const StorePath & drvPath,
const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal);
const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal) override;
std::shared_ptr<DerivationGoal> makeBasicDerivationGoal(
const StorePath & drvPath, const BasicDerivation & drv,
const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal);
const OutputsSpec & wantedOutputs, BuildMode buildMode = bmNormal) override;
/**
* @ref SubstitutionGoal "substitution goal"
*/
std::shared_ptr<PathSubstitutionGoal> makePathSubstitutionGoal(const StorePath & storePath, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
std::shared_ptr<DrvOutputSubstitutionGoal> makeDrvOutputSubstitutionGoal(const DrvOutput & id, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
std::shared_ptr<PathSubstitutionGoal> makePathSubstitutionGoal(const StorePath & storePath, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt) override;
std::shared_ptr<DrvOutputSubstitutionGoal> makeDrvOutputSubstitutionGoal(const DrvOutput & id, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt) override;
/**
* Make a goal corresponding to the `DerivedPath`.
@ -235,8 +281,9 @@ public:
* It will be a `DerivationGoal` for a `DerivedPath::Built` or
* a `SubstitutionGoal` for a `DerivedPath::Opaque`.
*/
GoalPtr makeGoal(const DerivedPath & req, BuildMode buildMode = bmNormal);
GoalPtr makeGoal(const DerivedPath & req, BuildMode buildMode = bmNormal) override;
public:
/**
* Unregisters a running child process.
*/
@ -245,7 +292,7 @@ public:
/**
* Loop until the specified top-level goals have finished.
*/
void run(const Goals & topGoals);
Goals run(std::function<Goals (GoalFactory &)> req);
/***
* The exit status in case of failure.