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Simplify ContentAddress

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Whereas `ContentAddressWithReferences` is a sum type complex because different
varieties support different notions of reference, and
`ContentAddressMethod` is a nested enum to support that,
`ContentAddress` can be a simple pair of a method and hash.

`ContentAddress` does not need to be a sum type on the outside because
the choice of method doesn't effect what type of hashes we can use.

Co-Authored-By: Cale Gibbard <cgibbard@gmail.com>
This commit is contained in:
John Ericson 2023-07-05 18:53:44 -04:00
parent 6db66ebfc5
commit 903700c5e1
20 changed files with 182 additions and 293 deletions
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22
src/libstore/derivations.cc
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@ -232,9 +232,10 @@ static DerivationOutput parseDerivationOutput(const Store & store,
validatePath(pathS);
auto hash = Hash::parseNonSRIUnprefixed(hashS, hashType);
return DerivationOutput::CAFixed {
.ca = ContentAddress::fromParts(
std::move(method),
std::move(hash)),
.ca = ContentAddress {
.method = std::move(method),
.hash = std::move(hash),
},
};
} else {
experimentalFeatureSettings.require(Xp::CaDerivations);
@ -395,7 +396,7 @@ std::string Derivation::unparse(const Store & store, bool maskOutputs,
[&](const DerivationOutput::CAFixed & dof) {
s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(dof.path(store, name, i.first)));
s += ','; printUnquotedString(s, dof.ca.printMethodAlgo());
s += ','; printUnquotedString(s, dof.ca.getHash().to_string(Base16, false));
s += ','; printUnquotedString(s, dof.ca.hash.to_string(Base16, false));
},
[&](const DerivationOutput::CAFloating & dof) {
s += ','; printUnquotedString(s, "");
@ -628,7 +629,7 @@ DrvHash hashDerivationModulo(Store & store, const Derivation & drv, bool maskOut
auto & dof = std::get<DerivationOutput::CAFixed>(i.second.raw());
auto hash = hashString(htSHA256, "fixed:out:"
+ dof.ca.printMethodAlgo() + ":"
+ dof.ca.getHash().to_string(Base16, false) + ":"
+ dof.ca.hash.to_string(Base16, false) + ":"
+ store.printStorePath(dof.path(store, drv.name, i.first)));
outputHashes.insert_or_assign(i.first, std::move(hash));
}
@ -780,7 +781,7 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
[&](const DerivationOutput::CAFixed & dof) {
out << store.printStorePath(dof.path(store, drv.name, i.first))
<< dof.ca.printMethodAlgo()
<< dof.ca.getHash().to_string(Base16, false);
<< dof.ca.hash.to_string(Base16, false);
},
[&](const DerivationOutput::CAFloating & dof) {
out << ""
@ -970,7 +971,7 @@ nlohmann::json DerivationOutput::toJSON(
[&](const DerivationOutput::CAFixed & dof) {
res["path"] = store.printStorePath(dof.path(store, drvName, outputName));
res["hashAlgo"] = dof.ca.printMethodAlgo();
res["hash"] = dof.ca.getHash().to_string(Base16, false);
res["hash"] = dof.ca.hash.to_string(Base16, false);
// FIXME print refs?
},
[&](const DerivationOutput::CAFloating & dof) {
@ -1017,9 +1018,10 @@ DerivationOutput DerivationOutput::fromJSON(
else if (keys == (std::set<std::string_view> { "path", "hashAlgo", "hash" })) {
auto [method, hashType] = methodAlgo();
auto dof = DerivationOutput::CAFixed {
.ca = ContentAddress::fromParts(
std::move(method),
Hash::parseNonSRIUnprefixed((std::string) json["hash"], hashType)),
.ca = ContentAddress {
.method = std::move(method),
.hash = Hash::parseNonSRIUnprefixed((std::string) json["hash"], hashType),
},
};
if (dof.path(store, drvName, outputName) != store.parseStorePath((std::string) json["path"]))
throw Error("Path doesn't match derivation output");