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Enfore the use of properly built paths in libcmd

Browse source 
Replace `DerivedPathWithHints` by a new `BuiltPath` type that serves as
a proof that the corresponding path has been built.
This commit is contained in:
regnat 2021-05-17 08:45:08 +02:00
parent ec613603ba
commit 2105084645
10 changed files with 189 additions and 144 deletions
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39
src/libcmd/command.cc
View file

@ -54,7 +54,7 @@ void StoreCommand::run()
run(getStore());
}
RealisedPathsCommand::RealisedPathsCommand(bool recursive)
BuiltPathsCommand::BuiltPathsCommand(bool recursive)
: recursive(recursive)
{
if (recursive)
@ -81,39 +81,45 @@ RealisedPathsCommand::RealisedPathsCommand(bool recursive)
});
}
void RealisedPathsCommand::run(ref<Store> store)
void BuiltPathsCommand::run(ref<Store> store)
{
std::vector<RealisedPath> paths;
BuiltPaths paths;
if (all) {
if (installables.size())
throw UsageError("'--all' does not expect arguments");
// XXX: Only uses opaque paths, ignores all the realisations
for (auto & p : store->queryAllValidPaths())
paths.push_back(p);
paths.push_back(BuiltPath::Opaque{p});
} else {
auto pathSet = toRealisedPaths(store, realiseMode, operateOn, installables);
paths = toBuiltPaths(store, realiseMode, operateOn, installables);
if (recursive) {
auto roots = std::move(pathSet);
pathSet = {};
RealisedPath::closure(*store, roots, pathSet);
// XXX: This only computes the store path closure, ignoring
// intermediate realisations
StorePathSet pathsRoots, pathsClosure;
for (auto & root: paths) {
auto rootFromThis = root.outPaths();
pathsRoots.insert(rootFromThis.begin(), rootFromThis.end());
}
store->computeFSClosure(pathsRoots, pathsClosure);
for (auto & path : pathsClosure)
paths.push_back(BuiltPath::Opaque{path});
}
for (auto & path : pathSet)
paths.push_back(path);
}
run(store, std::move(paths));
}
StorePathsCommand::StorePathsCommand(bool recursive)
: RealisedPathsCommand(recursive)
: BuiltPathsCommand(recursive)
{
}
void StorePathsCommand::run(ref<Store> store, std::vector<RealisedPath> paths)
void StorePathsCommand::run(ref<Store> store, BuiltPaths paths)
{
StorePaths storePaths;
for (auto & p : paths)
storePaths.push_back(p.path());
for (auto& builtPath : paths)
for (auto& p : builtPath.outPaths())
storePaths.push_back(p);
run(store, std::move(storePaths));
}
@ -175,10 +181,7 @@ void MixProfile::updateProfile(const BuiltPaths & buildables)
},
[&](BuiltPath::Built bfd) {
for (auto & output : bfd.outputs) {
/* Output path should be known because we just tried to
build it. */
assert(output.second);
result.push_back(*output.second);
result.push_back(output.second);
}
},
}, buildable.raw());

14
src/libcmd/command.hh
View file

@ -143,7 +143,7 @@ private:
};
/* A command that operates on zero or more store paths. */
struct RealisedPathsCommand : public InstallablesCommand
struct BuiltPathsCommand : public InstallablesCommand
{
private:
@ -156,26 +156,26 @@ protected:
public:
RealisedPathsCommand(bool recursive = false);
BuiltPathsCommand(bool recursive = false);
using StoreCommand::run;
virtual void run(ref<Store> store, std::vector<RealisedPath> paths) = 0;
virtual void run(ref<Store> store, BuiltPaths paths) = 0;
void run(ref<Store> store) override;
bool useDefaultInstallables() override { return !all; }
};
struct StorePathsCommand : public RealisedPathsCommand
struct StorePathsCommand : public BuiltPathsCommand
{
StorePathsCommand(bool recursive = false);
using RealisedPathsCommand::run;
using BuiltPathsCommand::run;
virtual void run(ref<Store> store, std::vector<StorePath> storePaths) = 0;
void run(ref<Store> store, std::vector<RealisedPath> paths) override;
void run(ref<Store> store, BuiltPaths paths) override;
};
/* A command that operates on exactly one store path. */
@ -231,7 +231,7 @@ std::set<StorePath> toDerivations(ref<Store> store,
std::vector<std::shared_ptr<Installable>> installables,
bool useDeriver = false);
std::set<RealisedPath> toRealisedPaths(
BuiltPaths toBuiltPaths(
ref<Store> store,
Realise mode,
OperateOn operateOn,

151
src/libcmd/installables.cc
View file

@ -285,9 +285,9 @@ void completeFlakeRef(ref<Store> store, std::string_view prefix)
}
}
BuiltPath Installable::toBuiltPath()
DerivedPath Installable::toDerivedPath()
{
auto buildables = toBuiltPaths();
auto buildables = toDerivedPaths();
if (buildables.size() != 1)
throw Error("installable '%s' evaluates to %d derivations, where only one is expected", what(), buildables.size());
return std::move(buildables[0]);
@ -321,22 +321,19 @@ struct InstallableStorePath : Installable
std::string what() override { return store->printStorePath(storePath); }
BuiltPaths toBuiltPaths() override
DerivedPaths toDerivedPaths() override
{
if (storePath.isDerivation()) {
std::map<std::string, std::optional<StorePath>> outputs;
auto drv = store->readDerivation(storePath);
for (auto & [name, output] : drv.outputsAndOptPaths(*store))
outputs.emplace(name, output.second);
return {
BuiltPath::Built {
DerivedPath::Built {
.drvPath = storePath,
.outputs = std::move(outputs)
.outputs = drv.outputNames(),
}
};
} else {
return {
BuiltPath::Opaque {
DerivedPath::Opaque {
.path = storePath,
}
};
@ -349,22 +346,22 @@ struct InstallableStorePath : Installable
}
};
BuiltPaths InstallableValue::toBuiltPaths()
DerivedPaths InstallableValue::toDerivedPaths()
{
BuiltPaths res;
DerivedPaths res;
std::map<StorePath, std::map<std::string, std::optional<StorePath>>> drvsToOutputs;
std::map<StorePath, std::set<std::string>> drvsToOutputs;
// Group by derivation, helps with .all in particular
for (auto & drv : toDerivations()) {
auto outputName = drv.outputName;
if (outputName == "")
throw Error("derivation '%s' lacks an 'outputName' attribute", state->store->printStorePath(drv.drvPath));
drvsToOutputs[drv.drvPath].insert_or_assign(outputName, drv.outPath);
drvsToOutputs[drv.drvPath].insert(outputName);
}
for (auto & i : drvsToOutputs)
res.push_back(BuiltPath::Built { i.first, i.second });
res.push_back(DerivedPath::Built { i.first, i.second });
return res;
}
@ -675,32 +672,67 @@ std::shared_ptr<Installable> SourceExprCommand::parseInstallable(
return installables.front();
}
BuiltPaths getBuiltPaths(ref<Store> store, DerivedPaths hopefullyBuiltPaths)
{
BuiltPaths res;
for (auto& b : hopefullyBuiltPaths)
std::visit(
overloaded{
[&](DerivedPath::Opaque bo) {
res.push_back(BuiltPath::Opaque{bo.path});
},
[&](DerivedPath::Built bfd) {
OutputPathMap outputs;
auto drv = store->readDerivation(bfd.drvPath);
auto outputHashes = staticOutputHashes(*store, drv);
auto drvOutputs = drv.outputsAndOptPaths(*store);
for (auto& output : bfd.outputs) {
if (!outputHashes.count(output))
throw Error(
"the derivation '%s' doesn't have an output "
"named '%s'",
store->printStorePath(bfd.drvPath), output);
if (settings.isExperimentalFeatureEnabled(
"ca-derivations")) {
auto outputId =
DrvOutput{outputHashes.at(output), output};
auto realisation =
store->queryRealisation(outputId);
if (!realisation)
throw Error(
"cannot operate on an output of unbuilt "
"content-addresed derivation '%s'",
outputId.to_string());
outputs.insert_or_assign(
output, realisation->outPath);
} else {
// If ca-derivations isn't enabled, assume that
// the output path is statically known.
assert(drvOutputs.count(output));
assert(drvOutputs.at(output).second);
outputs.insert_or_assign(
output, *drvOutputs.at(output).second);
}
}
res.push_back(BuiltPath::Built{bfd.drvPath, outputs});
},
},
b.raw());
return res;
}
BuiltPaths build(ref<Store> store, Realise mode,
std::vector<std::shared_ptr<Installable>> installables, BuildMode bMode)
{
if (mode == Realise::Nothing)
settings.readOnlyMode = true;
BuiltPaths buildables;
std::vector<DerivedPath> pathsToBuild;
for (auto & i : installables) {
for (auto & b : i->toBuiltPaths()) {
std::visit(overloaded {
[&](BuiltPath::Opaque bo) {
pathsToBuild.push_back(bo);
},
[&](BuiltPath::Built bfd) {
StringSet outputNames;
for (auto & output : bfd.outputs)
outputNames.insert(output.first);
pathsToBuild.push_back(
DerivedPath::Built{bfd.drvPath, outputNames});
},
}, b.raw());
buildables.push_back(std::move(b));
}
auto b = i->toDerivedPaths();
pathsToBuild.insert(pathsToBuild.end(), b.begin(), b.end());
}
if (mode == Realise::Nothing)
@ -708,57 +740,26 @@ BuiltPaths build(ref<Store> store, Realise mode,
else if (mode == Realise::Outputs)
store->buildPaths(pathsToBuild, bMode);
return buildables;
return getBuiltPaths(store, pathsToBuild);
}
std::set<RealisedPath> toRealisedPaths(
BuiltPaths toBuiltPaths(
ref<Store> store,
Realise mode,
OperateOn operateOn,
std::vector<std::shared_ptr<Installable>> installables)
{
std::set<RealisedPath> res;
if (operateOn == OperateOn::Output) {
for (auto & b : build(store, mode, installables))
std::visit(overloaded {
[&](BuiltPath::Opaque bo) {
res.insert(bo.path);
},
[&](BuiltPath::Built bfd) {
auto drv = store->readDerivation(bfd.drvPath);
auto outputHashes = staticOutputHashes(*store, drv);
for (auto & output : bfd.outputs) {
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (!outputHashes.count(output.first))
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store->printStorePath(bfd.drvPath),
output.first);
auto outputId = DrvOutput{outputHashes.at(output.first), output.first};
auto realisation = store->queryRealisation(outputId);
if (!realisation)
throw Error("cannot operate on an output of unbuilt content-addresed derivation '%s'", outputId.to_string());
res.insert(RealisedPath{*realisation});
}
else {
// If ca-derivations isn't enabled, behave as if
// all the paths are opaque to keep the default
// behavior
assert(output.second);
res.insert(*output.second);
}
}
},
}, b.raw());
return build(store, mode, installables);
} else {
if (mode == Realise::Nothing)
settings.readOnlyMode = true;
auto drvPaths = toDerivations(store, installables, true);
res.insert(drvPaths.begin(), drvPaths.end());
}
BuiltPaths res;
for (auto & drvPath : toDerivations(store, installables, true))
res.push_back(BuiltPath::Opaque{drvPath});
return res;
}
}
StorePathSet toStorePaths(ref<Store> store,
@ -766,8 +767,10 @@ StorePathSet toStorePaths(ref<Store> store,
std::vector<std::shared_ptr<Installable>> installables)
{
StorePathSet outPaths;
for (auto & path : toRealisedPaths(store, mode, operateOn, installables))
outPaths.insert(path.path());
for (auto & path : toBuiltPaths(store, mode, operateOn, installables)) {
auto thisOutPaths = path.outPaths();
outPaths.insert(thisOutPaths.begin(), thisOutPaths.end());
}
return outPaths;
}
@ -789,9 +792,9 @@ StorePathSet toDerivations(ref<Store> store,
StorePathSet drvPaths;
for (auto & i : installables)
for (auto & b : i->toBuiltPaths())
for (auto & b : i->toDerivedPaths())
std::visit(overloaded {
[&](BuiltPath::Opaque bo) {
[&](DerivedPath::Opaque bo) {
if (!useDeriver)
throw Error("argument '%s' did not evaluate to a derivation", i->what());
auto derivers = store->queryValidDerivers(bo.path);
@ -800,7 +803,7 @@ StorePathSet toDerivations(ref<Store> store,
// FIXME: use all derivers?
drvPaths.insert(*derivers.begin());
},
[&](BuiltPath::Built bfd) {
[&](DerivedPath::Built bfd) {
drvPaths.insert(bfd.drvPath);
},
}, b.raw());

6
src/libcmd/installables.hh
View file

@ -29,9 +29,9 @@ struct Installable
virtual std::string what() = 0;
virtual BuiltPaths toBuiltPaths() = 0;
virtual DerivedPaths toDerivedPaths() = 0;
BuiltPath toBuiltPath();
DerivedPath toDerivedPath();
App toApp(EvalState & state);
@ -74,7 +74,7 @@ struct InstallableValue : Installable
virtual std::vector<DerivationInfo> toDerivations() = 0;
BuiltPaths toBuiltPaths() override;
DerivedPaths toDerivedPaths() override;
};
struct InstallableFlake : InstallableValue

43
src/libstore/derived-path.cc
View file

@ -15,11 +15,26 @@ 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] = path ? store->printStorePath(*path) : "";
res["outputs"][output] = store->printStorePath(path);
}
return res;
}
StorePathSet BuiltPath::outPaths() const
{
return std::visit(
overloaded{
[](BuiltPath::Opaque p) { return StorePathSet{p.path}; },
[](BuiltPath::Built b) {
StorePathSet res;
for (auto & [_, path] : b.outputs)
res.insert(path);
return res;
},
}, raw()
);
}
nlohmann::json derivedPathsWithHintsToJSON(const BuiltPaths & buildables, ref<Store> store) {
auto res = nlohmann::json::array();
for (const BuiltPath & buildable : buildables) {
@ -74,4 +89,30 @@ DerivedPath DerivedPath::parse(const Store & store, std::string_view s)
: (DerivedPath) DerivedPath::Built::parse(store, s);
}
RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const
{
RealisedPath::Set res;
std::visit(
overloaded{
[&](BuiltPath::Opaque p) { res.insert(p.path); },
[&](BuiltPath::Built p) {
auto drvHashes =
staticOutputHashes(store, store.readDerivation(p.drvPath));
for (auto& [outputName, outputPath] : p.outputs) {
if (settings.isExperimentalFeatureEnabled(
"ca-derivations")) {
auto thisRealisation = store.queryRealisation(
DrvOutput{drvHashes.at(outputName), outputName});
assert(thisRealisation); // We’ve built it, so we must h
// ve the realisation
res.insert(*thisRealisation);
} else {
res.insert(outputPath);
}
}
},
},
raw());
return res;
}
}

22
src/libstore/derived-path.hh
View file

@ -2,6 +2,7 @@
#include "util.hh"
#include "path.hh"
#include "realisation.hh"
#include <optional>
@ -83,7 +84,7 @@ struct DerivedPath : _DerivedPathRaw {
*/
struct BuiltPathBuilt {
StorePath drvPath;
std::map<std::string, std::optional<StorePath>> outputs;
std::map<std::string, StorePath> outputs;
nlohmann::json toJSON(ref<Store> store) const;
static BuiltPathBuilt parse(const Store & store, std::string_view);
@ -95,20 +96,9 @@ using _BuiltPathRaw = std::variant<
>;
/**
* A derived path with hints in the form of optional concrete output paths in the built case.
*
* This type is currently just used by the CLI. The paths are filled in
* during evaluation for derivations that know what paths they will
* produce in advanced, i.e. input-addressed or fixed-output content
* addressed derivations.
*
* That isn't very good, because it puts floating content-addressed
* derivations "at a disadvantage". It would be better to never rely on
* the output path of unbuilt derivations, and exclusively use the
* realizations types to work with built derivations' concrete output
* paths.
* A built path. Similar to a `DerivedPath`, but enriched with the corresponding
* output path(s).
*/
// FIXME Stop using and delete this, or if that is not possible move out of libstore to libcmd.
struct BuiltPath : _BuiltPathRaw {
using Raw = _BuiltPathRaw;
using Raw::Raw;
@ -120,8 +110,12 @@ struct BuiltPath : _BuiltPathRaw {
return static_cast<const Raw &>(*this);
}
StorePathSet outPaths() const;
RealisedPath::Set toRealisedPaths(Store & store) const;
};
typedef std::vector<DerivedPath> DerivedPaths;
typedef std::vector<BuiltPath> BuiltPaths;
nlohmann::json derivedPathsWithHintsToJSON(const BuiltPaths & buildables, ref<Store> store);

20
src/nix/copy.cc
View file

@ -8,7 +8,7 @@
using namespace nix;
struct CmdCopy : RealisedPathsCommand
struct CmdCopy : BuiltPathsCommand
{
std::string srcUri, dstUri;
@ -16,10 +16,10 @@ struct CmdCopy : RealisedPathsCommand
SubstituteFlag substitute = NoSubstitute;
using RealisedPathsCommand::run;
using BuiltPathsCommand::run;
CmdCopy()
: RealisedPathsCommand(true)
: BuiltPathsCommand(true)
{
addFlag({
.longName = "from",
@ -75,16 +75,22 @@ struct CmdCopy : RealisedPathsCommand
if (srcUri.empty() && dstUri.empty())
throw UsageError("you must pass '--from' and/or '--to'");
RealisedPathsCommand::run(store);
BuiltPathsCommand::run(store);
}
void run(ref<Store> srcStore, std::vector<RealisedPath> paths) override
void run(ref<Store> srcStore, BuiltPaths paths) override
{
ref<Store> dstStore = dstUri.empty() ? openStore() : openStore(dstUri);
RealisedPath::Set stuffToCopy;
for (auto & builtPath : paths) {
auto theseRealisations = builtPath.toRealisedPaths(*srcStore);
stuffToCopy.insert(theseRealisations.begin(), theseRealisations.end());
}
copyPaths(
srcStore, dstStore, RealisedPath::Set(paths.begin(), paths.end()),
NoRepair, checkSigs, substitute);
srcStore, dstStore, stuffToCopy, NoRepair, checkSigs, substitute);
}
};

17
src/nix/develop.cc
View file

@ -265,9 +265,9 @@ struct Common : InstallableCommand, MixProfile
for (auto & [installable_, dir_] : redirects) {
auto dir = absPath(dir_);
auto installable = parseInstallable(store, installable_);
auto buildable = installable->toBuiltPath();
auto doRedirect = [&](const StorePath & path)
{
auto builtPaths = toStorePaths(
store, Realise::Nothing, OperateOn::Output, {installable});
for (auto & path: builtPaths) {
auto from = store->printStorePath(path);
if (script.find(from) == std::string::npos)
warn("'%s' (path '%s') is not used by this build environment", installable->what(), from);
@ -275,16 +275,7 @@ struct Common : InstallableCommand, MixProfile
printInfo("redirecting '%s' to '%s'", from, dir);
rewrites.insert({from, dir});
}
};
std::visit(overloaded {
[&](const BuiltPath::Opaque & bo) {
doRedirect(bo.path);
},
[&](const BuiltPath::Built & bfd) {
for (auto & [outputName, path] : bfd.outputs)
if (path) doRedirect(*path);
},
}, buildable.raw());
}
}
return rewriteStrings(script, rewrites);

6
src/nix/log.cc
View file

@ -30,15 +30,15 @@ struct CmdLog : InstallableCommand
subs.push_front(store);
auto b = installable->toBuiltPath();
auto b = installable->toDerivedPath();
RunPager pager;
for (auto & sub : subs) {
auto log = std::visit(overloaded {
[&](BuiltPath::Opaque bo) {
[&](DerivedPath::Opaque bo) {
return sub->getBuildLog(bo.path);
},
[&](BuiltPath::Built bfd) {
[&](DerivedPath::Built bfd) {
return sub->getBuildLog(bfd.drvPath);
},
}, b.raw());

15
src/nix/realisation.cc
View file

@ -28,7 +28,7 @@ struct CmdRealisation : virtual NixMultiCommand
static auto rCmdRealisation = registerCommand<CmdRealisation>("realisation");
struct CmdRealisationInfo : RealisedPathsCommand, MixJSON
struct CmdRealisationInfo : BuiltPathsCommand, MixJSON
{
std::string description() override
{
@ -44,12 +44,19 @@ struct CmdRealisationInfo : RealisedPathsCommand, MixJSON
Category category() override { return catSecondary; }
void run(ref<Store> store, std::vector<RealisedPath> paths) override
void run(ref<Store> store, BuiltPaths paths) override
{
settings.requireExperimentalFeature("ca-derivations");
RealisedPath::Set realisations;
for (auto & builtPath : paths) {
auto theseRealisations = builtPath.toRealisedPaths(*store);
realisations.insert(theseRealisations.begin(), theseRealisations.end());
}
if (json) {
nlohmann::json res = nlohmann::json::array();
for (auto & path : paths) {
for (auto & path : realisations) {
nlohmann::json currentPath;
if (auto realisation = std::get_if<Realisation>(&path.raw))
currentPath = realisation->toJSON();
@ -61,7 +68,7 @@ struct CmdRealisationInfo : RealisedPathsCommand, MixJSON
std::cout << res.dump();
}
else {
for (auto & path : paths) {
for (auto & path : realisations) {
if (auto realisation = std::get_if<Realisation>(&path.raw)) {
std::cout <<
realisation->id.to_string() << " " <<