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Clean up DerivationOutput, and headers

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1. `DerivationOutput` now as the `std::variant` as a base class. And the
   variants are given hierarchical names under `DerivationOutput`.

   In 8e0d0689be @matthewbauer and I
   didn't know a better idiom, and so we made it a field. But this sort
   of "newtype" is anoying for literals downstream.

   Since then we leaned the base class, inherit the constructors trick,
   e.g. used in `DerivedPath`. Switching to use that makes this more
   ergonomic, and consistent.

2. `store-api.hh` and `derivations.hh` are now independent.

   In bcde5456cc I swapped the dependency,
   but I now know it is better to just keep on using incomplete types as
   much as possible for faster compilation and good separation of
   concerns.
This commit is contained in:
John Ericson 2022-03-17 22:29:15 +00:00
parent 6afc361798
commit 197feed51d
16 changed files with 113 additions and 103 deletions
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1
src/libexpr/get-drvs.cc
View file

@ -1,6 +1,7 @@
#include "get-drvs.hh"
#include "util.hh"
#include "eval-inline.hh"
#include "derivations.hh"
#include "store-api.hh"
#include "path-with-outputs.hh"

36
src/libexpr/primops.cc
View file

@ -1163,26 +1163,24 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName);
drv.env["out"] = state.store->printStorePath(outPath);
drv.outputs.insert_or_assign("out", DerivationOutput {
.output = DerivationOutputCAFixed {
.hash = FixedOutputHash {
.method = ingestionMethod,
.hash = std::move(h),
},
drv.outputs.insert_or_assign("out",
DerivationOutput::CAFixed {
.hash = FixedOutputHash {
.method = ingestionMethod,
.hash = std::move(h),
},
});
});
}
else if (contentAddressed) {
HashType ht = parseHashType(outputHashAlgo);
for (auto & i : outputs) {
drv.env[i] = hashPlaceholder(i);
drv.outputs.insert_or_assign(i, DerivationOutput {
.output = DerivationOutputCAFloating {
drv.outputs.insert_or_assign(i,
DerivationOutput::CAFloating {
.method = ingestionMethod,
.hashType = ht,
},
});
});
}
}
@ -1196,10 +1194,8 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
for (auto & i : outputs) {
drv.env[i] = "";
drv.outputs.insert_or_assign(i,
DerivationOutput {
.output = DerivationOutputInputAddressed {
.path = StorePath::dummy,
},
DerivationOutput::InputAddressed {
.path = StorePath::dummy,
});
}
@ -1213,9 +1209,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
case DrvHash::Kind::Deferred:
for (auto & i : outputs) {
drv.outputs.insert_or_assign(i,
DerivationOutput {
.output = DerivationOutputDeferred{},
});
DerivationOutput::Deferred { });
}
break;
case DrvHash::Kind::Regular:
@ -1223,10 +1217,8 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
auto outPath = state.store->makeOutputPath(i, h, drvName);
drv.env[i] = state.store->printStorePath(outPath);
drv.outputs.insert_or_assign(i,
DerivationOutput {
.output = DerivationOutputInputAddressed {
.path = std::move(outPath),
},
DerivationOutput::InputAddressed {
.path = std::move(outPath),
});
}
break;

1
src/libexpr/primops/context.cc
View file

@ -1,5 +1,6 @@
#include "primops.hh"
#include "eval-inline.hh"
#include "derivations.hh"
#include "store-api.hh"
namespace nix {

14
src/libstore/build/local-derivation-goal.cc
View file

@ -2279,7 +2279,7 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
return res;
};
auto newInfoFromCA = [&](const DerivationOutputCAFloating outputHash) -> ValidPathInfo {
auto newInfoFromCA = [&](const DerivationOutput::CAFloating outputHash) -> ValidPathInfo {
auto & st = outputStats.at(outputName);
if (outputHash.method == FileIngestionMethod::Flat) {
/* The output path should be a regular file without execute permission. */
@ -2346,7 +2346,7 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
ValidPathInfo newInfo = std::visit(overloaded {
[&](const DerivationOutputInputAddressed & output) {
[&](const DerivationOutput::InputAddressed & output) {
/* input-addressed case */
auto requiredFinalPath = output.path;
/* Preemptively add rewrite rule for final hash, as that is
@ -2366,8 +2366,8 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
return newInfo0;
},
[&](const DerivationOutputCAFixed & dof) {
auto newInfo0 = newInfoFromCA(DerivationOutputCAFloating {
[&](const DerivationOutput::CAFixed & dof) {
auto newInfo0 = newInfoFromCA(DerivationOutput::CAFloating {
.method = dof.hash.method,
.hashType = dof.hash.hash.type,
});
@ -2389,17 +2389,17 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
return newInfo0;
},
[&](DerivationOutputCAFloating & dof) {
[&](const DerivationOutput::CAFloating & dof) {
return newInfoFromCA(dof);
},
[&](DerivationOutputDeferred) -> ValidPathInfo {
[&](const DerivationOutput::Deferred &) -> ValidPathInfo {
// No derivation should reach that point without having been
// rewritten first
assert(false);
},
}, output.output);
}, output.raw());
/* FIXME: set proper permissions in restorePath() so
we don't have to do another traversal. */

80
src/libstore/derivations.cc
View file

@ -11,25 +11,25 @@ namespace nix {
std::optional<StorePath> DerivationOutput::path(const Store & store, std::string_view drvName, std::string_view outputName) const
{
return std::visit(overloaded {
[](const DerivationOutputInputAddressed & doi) -> std::optional<StorePath> {
[](const DerivationOutput::InputAddressed & doi) -> std::optional<StorePath> {
return { doi.path };
},
[&](const DerivationOutputCAFixed & dof) -> std::optional<StorePath> {
[&](const DerivationOutput::CAFixed & dof) -> std::optional<StorePath> {
return {
dof.path(store, drvName, outputName)
};
},
[](const DerivationOutputCAFloating & dof) -> std::optional<StorePath> {
[](const DerivationOutput::CAFloating & dof) -> std::optional<StorePath> {
return std::nullopt;
},
[](const DerivationOutputDeferred &) -> std::optional<StorePath> {
[](const DerivationOutput::Deferred &) -> std::optional<StorePath> {
return std::nullopt;
},
}, output);
}, raw());
}
StorePath DerivationOutputCAFixed::path(const Store & store, std::string_view drvName, std::string_view outputName) const {
StorePath DerivationOutput::CAFixed::path(const Store & store, std::string_view drvName, std::string_view outputName) const {
return store.makeFixedOutputPath(
hash.method, hash.hash,
outputPathName(drvName, outputName));
@ -179,35 +179,27 @@ static DerivationOutput parseDerivationOutput(const Store & store,
const auto hashType = parseHashType(hashAlgo);
if (hash != "") {
validatePath(pathS);
return DerivationOutput {
.output = DerivationOutputCAFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash::parseNonSRIUnprefixed(hash, hashType),
},
return DerivationOutput::CAFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash::parseNonSRIUnprefixed(hash, hashType),
},
};
} else {
settings.requireExperimentalFeature(Xp::CaDerivations);
assert(pathS == "");
return DerivationOutput {
.output = DerivationOutputCAFloating {
.method = std::move(method),
.hashType = std::move(hashType),
},
return DerivationOutput::CAFloating {
.method = std::move(method),
.hashType = std::move(hashType),
};
}
} else {
if (pathS == "") {
return DerivationOutput {
.output = DerivationOutputDeferred { }
};
return DerivationOutput::Deferred { };
}
validatePath(pathS);
return DerivationOutput {
.output = DerivationOutputInputAddressed {
.path = store.parseStorePath(pathS),
}
return DerivationOutput::InputAddressed {
.path = store.parseStorePath(pathS),
};
}
}
@ -335,27 +327,27 @@ std::string Derivation::unparse(const Store & store, bool maskOutputs,
if (first) first = false; else s += ',';
s += '('; printUnquotedString(s, i.first);
std::visit(overloaded {
[&](const DerivationOutputInputAddressed & doi) {
[&](const DerivationOutput::InputAddressed & doi) {
s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(doi.path));
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
},
[&](const DerivationOutputCAFixed & dof) {
[&](const DerivationOutput::CAFixed & dof) {
s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(dof.path(store, name, i.first)));
s += ','; printUnquotedString(s, dof.hash.printMethodAlgo());
s += ','; printUnquotedString(s, dof.hash.hash.to_string(Base16, false));
},
[&](const DerivationOutputCAFloating & dof) {
[&](const DerivationOutput::CAFloating & dof) {
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
s += ','; printUnquotedString(s, "");
},
[&](const DerivationOutputDeferred &) {
[&](const DerivationOutput::Deferred &) {
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
}
}, i.second.output);
}, i.second.raw());
s += ')';
}
@ -423,13 +415,13 @@ DerivationType BasicDerivation::type() const
std::optional<HashType> floatingHashType;
for (auto & i : outputs) {
std::visit(overloaded {
[&](const DerivationOutputInputAddressed &) {
[&](const DerivationOutput::InputAddressed &) {
inputAddressedOutputs.insert(i.first);
},
[&](const DerivationOutputCAFixed &) {
[&](const DerivationOutput::CAFixed &) {
fixedCAOutputs.insert(i.first);
},
[&](const DerivationOutputCAFloating & dof) {
[&](const DerivationOutput::CAFloating & dof) {
floatingCAOutputs.insert(i.first);
if (!floatingHashType) {
floatingHashType = dof.hashType;
@ -438,10 +430,10 @@ DerivationType BasicDerivation::type() const
throw Error("All floating outputs must use the same hash type");
}
},
[&](const DerivationOutputDeferred &) {
[&](const DerivationOutput::Deferred &) {
deferredIAOutputs.insert(i.first);
},
}, i.second.output);
}, i.second.raw());
}
if (inputAddressedOutputs.empty() && fixedCAOutputs.empty() && floatingCAOutputs.empty() && deferredIAOutputs.empty()) {
@ -516,7 +508,7 @@ DrvHashModulo hashDerivationModulo(Store & store, const Derivation & drv, bool m
case DerivationType::CAFixed: {
std::map<std::string, Hash> outputHashes;
for (const auto & i : drv.outputs) {
auto & dof = std::get<DerivationOutputCAFixed>(i.second.output);
auto & dof = std::get<DerivationOutput::CAFixed>(i.second.raw());
auto hash = hashString(htSHA256, "fixed:out:"
+ dof.hash.printMethodAlgo() + ":"
+ dof.hash.hash.to_string(Base16, false) + ":"
@ -672,27 +664,27 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
for (auto & i : drv.outputs) {
out << i.first;
std::visit(overloaded {
[&](const DerivationOutputInputAddressed & doi) {
[&](const DerivationOutput::InputAddressed & doi) {
out << store.printStorePath(doi.path)
<< ""
<< "";
},
[&](const DerivationOutputCAFixed & dof) {
[&](const DerivationOutput::CAFixed & dof) {
out << store.printStorePath(dof.path(store, drv.name, i.first))
<< dof.hash.printMethodAlgo()
<< dof.hash.hash.to_string(Base16, false);
},
[&](const DerivationOutputCAFloating & dof) {
[&](const DerivationOutput::CAFloating & dof) {
out << ""
<< (makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType))
<< "";
},
[&](const DerivationOutputDeferred &) {
[&](const DerivationOutput::Deferred &) {
out << ""
<< ""
<< "";
},
}, i.second.output);
}, i.second.raw());
}
worker_proto::write(store, out, drv.inputSrcs);
out << drv.platform << drv.builder << drv.args;
@ -740,14 +732,12 @@ static void rewriteDerivation(Store & store, BasicDerivation & drv, const String
auto hashModulo = hashDerivationModulo(store, Derivation(drv), true);
for (auto & [outputName, output] : drv.outputs) {
if (std::holds_alternative<DerivationOutputDeferred>(output.output)) {
if (std::holds_alternative<DerivationOutput::Deferred>(output.raw())) {
auto & h = hashModulo.requireNoFixedNonDeferred();
auto outPath = store.makeOutputPath(outputName, h, drv.name);
drv.env[outputName] = store.printStorePath(outPath);
output = DerivationOutput {
.output = DerivationOutputInputAddressed {
.path = std::move(outPath),
},
output = DerivationOutput::InputAddressed {
.path = std::move(outPath),
};
}
}

35
src/libstore/derivations.hh
View file

@ -4,6 +4,7 @@
#include "types.hh"
#include "hash.hh"
#include "content-address.hh"
#include "repair-flag.hh"
#include "sync.hh"
#include <map>
@ -44,19 +45,31 @@ struct DerivationOutputCAFloating
*/
struct DerivationOutputDeferred {};
struct DerivationOutput
typedef std::variant<
DerivationOutputInputAddressed,
DerivationOutputCAFixed,
DerivationOutputCAFloating,
DerivationOutputDeferred
> _DerivationOutputRaw;
struct DerivationOutput : _DerivationOutputRaw
{
std::variant<
DerivationOutputInputAddressed,
DerivationOutputCAFixed,
DerivationOutputCAFloating,
DerivationOutputDeferred
> output;
using Raw = _DerivationOutputRaw;
using Raw::Raw;
using InputAddressed = DerivationOutputInputAddressed;
using CAFixed = DerivationOutputCAFixed;
using CAFloating = DerivationOutputCAFloating;
using Deferred = DerivationOutputDeferred;
/* Note, when you use this function you should make sure that you're passing
the right derivation name. When in doubt, you should use the safer
interface provided by BasicDerivation::outputsAndOptPaths */
std::optional<StorePath> path(const Store & store, std::string_view drvName, std::string_view outputName) const;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
};
typedef std::map<std::string, DerivationOutput> DerivationOutputs;
@ -150,8 +163,6 @@ struct Derivation : BasicDerivation
class Store;
enum RepairFlag : bool { NoRepair = false, Repair = true };
/* Write a derivation to the Nix store, and return its path. */
StorePath writeDerivation(Store & store,
const Derivation & drv,
@ -197,10 +208,10 @@ typedef std::variant<
DrvHash,
// Fixed-output derivation hashes
CaOutputHashes
> DrvHashModuloRaw;
> _DrvHashModuloRaw;
struct DrvHashModulo : DrvHashModuloRaw {
using Raw = DrvHashModuloRaw;
struct DrvHashModulo : _DrvHashModuloRaw {
using Raw = _DrvHashModuloRaw;
using Raw::Raw;
/* Get hash, throwing if it is per-output CA hashes or a

1
src/libstore/derived-path.cc
View file

@ -1,4 +1,5 @@
#include "derived-path.hh"
#include "derivations.hh"
#include "store-api.hh"
#include <nlohmann/json.hpp>

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

@ -698,7 +698,7 @@ void LocalStore::checkDerivationOutputs(const StorePath & drvPath, const Derivat
std::optional<Hash> h;
for (auto & i : drv.outputs) {
std::visit(overloaded {
[&](const DerivationOutputInputAddressed & doia) {
[&](const DerivationOutput::InputAddressed & doia) {
if (!h) {
// somewhat expensive so we do lazily
auto h0 = hashDerivationModulo(*this, drv, true);
@ -710,16 +710,16 @@ void LocalStore::checkDerivationOutputs(const StorePath & drvPath, const Derivat
printStorePath(drvPath), printStorePath(doia.path), printStorePath(recomputed));
envHasRightPath(doia.path, i.first);
},
[&](const DerivationOutputCAFixed & dof) {
[&](const DerivationOutput::CAFixed & dof) {
StorePath path = makeFixedOutputPath(dof.hash.method, dof.hash.hash, drvName);
envHasRightPath(path, i.first);
},
[&](const DerivationOutputCAFloating &) {
[&](const DerivationOutput::CAFloating &) {
/* Nothing to check */
},
[&](const DerivationOutputDeferred &) {
[&](const DerivationOutput::Deferred &) {
},
}, i.second.output);
}, i.second.raw());
}
}

2
src/libstore/misc.cc
View file

@ -87,7 +87,7 @@ std::optional<ContentAddress> getDerivationCA(const BasicDerivation & drv)
{
auto out = drv.outputs.find("out");
if (out != drv.outputs.end()) {
if (auto v = std::get_if<DerivationOutputCAFixed>(&out->second.output))
if (const auto * v = std::get_if<DerivationOutput::CAFixed>(&out->second.raw()))
return v->hash;
}
return std::nullopt;

1
src/libstore/parsed-derivations.hh
View file

@ -1,5 +1,6 @@
#pragma once
#include "derivations.hh"
#include "store-api.hh"
#include <nlohmann/json_fwd.hpp>

7
src/libstore/repair-flag.hh Normal file
View file

@ -0,0 +1,7 @@
#pragma once
namespace nix {
enum RepairFlag : bool { NoRepair = false, Repair = true };
}

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

@ -1,6 +1,7 @@
#include "crypto.hh"
#include "fs-accessor.hh"
#include "globals.hh"
#include "derivations.hh"
#include "store-api.hh"
#include "util.hh"
#include "nar-info-disk-cache.hh"

4
src/libstore/store-api.hh
View file

@ -10,8 +10,8 @@
#include "sync.hh"
#include "globals.hh"
#include "config.hh"
#include "derivations.hh"
#include "path-info.hh"
#include "repair-flag.hh"
#include <atomic>
#include <limits>
@ -62,6 +62,8 @@ MakeError(BadStorePath, Error);
MakeError(InvalidStoreURI, Error);
struct BasicDerivation;
struct Derivation;
class FSAccessor;
class NarInfoDiskCache;
class Store;

1
src/nix/app.cc
View file

@ -4,6 +4,7 @@
#include "eval-cache.hh"
#include "names.hh"
#include "command.hh"
#include "derivations.hh"
namespace nix {

12
src/nix/develop.cc
View file

@ -196,14 +196,14 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
drv.inputSrcs.insert(std::move(getEnvShPath));
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
for (auto & output : drv.outputs) {
output.second = {
.output = DerivationOutputDeferred{},
};
output.second = DerivationOutput::Deferred {},
drv.env[output.first] = hashPlaceholder(output.first);
}
} else {
for (auto & output : drv.outputs) {
output.second = { .output = DerivationOutputInputAddressed { .path = StorePath::dummy } };
output.second = DerivationOutput::InputAddressed {
.path = StorePath::dummy,
};
drv.env[output.first] = "";
}
auto h0 = hashDerivationModulo(*evalStore, drv, true);
@ -211,7 +211,9 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
for (auto & output : drv.outputs) {
auto outPath = store->makeOutputPath(output.first, h, drv.name);
output.second = { .output = DerivationOutputInputAddressed { .path = outPath } };
output.second = DerivationOutput::InputAddressed {
.path = outPath,
};
drv.env[output.first] = store->printStorePath(outPath);
}
}

10
src/nix/show-derivation.cc
View file

@ -65,19 +65,19 @@ struct CmdShowDerivation : InstallablesCommand
auto & outputName = _outputName; // work around clang bug
auto outputObj { outputsObj.object(outputName) };
std::visit(overloaded {
[&](const DerivationOutputInputAddressed & doi) {
[&](const DerivationOutput::InputAddressed & doi) {
outputObj.attr("path", store->printStorePath(doi.path));
},
[&](const DerivationOutputCAFixed & dof) {
[&](const DerivationOutput::CAFixed & dof) {
outputObj.attr("path", store->printStorePath(dof.path(*store, drv.name, outputName)));
outputObj.attr("hashAlgo", dof.hash.printMethodAlgo());
outputObj.attr("hash", dof.hash.hash.to_string(Base16, false));
},
[&](const DerivationOutputCAFloating & dof) {
[&](const DerivationOutput::CAFloating & dof) {
outputObj.attr("hashAlgo", makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
},
[&](const DerivationOutputDeferred &) {},
}, output.output);
[&](const DerivationOutput::Deferred &) {},
}, output.raw());
}
}