diff options
Diffstat (limited to 'src/libstore/derivations.cc')
| -rw-r--r-- | src/libstore/derivations.cc | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc index 06cc69056..7eb5cd275 100644 --- a/src/libstore/derivations.cc +++ b/src/libstore/derivations.cc @@ -313,6 +313,15 @@ Derivation parseDerivation(const Store & store, std::string && s, std::string_vi } +/** + * Print a derivation string literal to an `std::string`. + * + * This syntax does not generalize to the expression language, which needs to + * escape `$`. + * + * @param res Where to print to + * @param s Which logical string to print + */ static void printString(std::string & res, std::string_view s) { boost::container::small_vector<char, 64 * 1024> buffer; @@ -889,6 +898,67 @@ std::optional<BasicDerivation> Derivation::tryResolve( return resolved; } + +void Derivation::checkInvariants(Store & store, const StorePath & drvPath) const +{ + assert(drvPath.isDerivation()); + std::string drvName(drvPath.name()); + drvName = drvName.substr(0, drvName.size() - drvExtension.size()); + + if (drvName != name) { + throw Error("Derivation '%s' has name '%s' which does not match its path", store.printStorePath(drvPath), name); + } + + auto envHasRightPath = [&](const StorePath & actual, const std::string & varName) + { + auto j = env.find(varName); + if (j == env.end() || store.parseStorePath(j->second) != actual) + throw Error("derivation '%s' has incorrect environment variable '%s', should be '%s'", + store.printStorePath(drvPath), varName, store.printStorePath(actual)); + }; + + + // Don't need the answer, but do this anyways to assert is proper + // combination. The code below is more general and naturally allows + // combinations that are currently prohibited. + type(); + + std::optional<DrvHash> hashesModulo; + for (auto & i : outputs) { + std::visit(overloaded { + [&](const DerivationOutput::InputAddressed & doia) { + if (!hashesModulo) { + // somewhat expensive so we do lazily + hashesModulo = hashDerivationModulo(store, *this, true); + } + auto currentOutputHash = get(hashesModulo->hashes, i.first); + if (!currentOutputHash) + throw Error("derivation '%s' has unexpected output '%s' (local-store / hashesModulo) named '%s'", + store.printStorePath(drvPath), store.printStorePath(doia.path), i.first); + StorePath recomputed = store.makeOutputPath(i.first, *currentOutputHash, drvName); + if (doia.path != recomputed) + throw Error("derivation '%s' has incorrect output '%s', should be '%s'", + store.printStorePath(drvPath), store.printStorePath(doia.path), store.printStorePath(recomputed)); + envHasRightPath(doia.path, i.first); + }, + [&](const DerivationOutput::CAFixed & dof) { + StorePath path = store.makeFixedOutputPath(dof.hash.method, dof.hash.hash, drvName); + envHasRightPath(path, i.first); + }, + [&](const DerivationOutput::CAFloating &) { + /* Nothing to check */ + }, + [&](const DerivationOutput::Deferred &) { + /* Nothing to check */ + }, + [&](const DerivationOutput::Impure &) { + /* Nothing to check */ + }, + }, i.second.raw()); + } +} + + const Hash impureOutputHash = hashString(htSHA256, "impure"); nlohmann::json DerivationOutput::toJSON( @@ -916,10 +986,79 @@ nlohmann::json DerivationOutput::toJSON( return res; } + +DerivationOutput DerivationOutput::fromJSON( + const Store & store, std::string_view drvName, std::string_view outputName, + const nlohmann::json & _json) +{ + std::set<std::string_view> keys; + auto json = (std::map<std::string, nlohmann::json>) _json; + + for (const auto & [key, _] : json) + keys.insert(key); + + auto methodAlgo = [&]() -> std::pair<FileIngestionMethod, HashType> { + std::string hashAlgo = json["hashAlgo"]; + auto method = FileIngestionMethod::Flat; + if (hashAlgo.substr(0, 2) == "r:") { + method = FileIngestionMethod::Recursive; + hashAlgo = hashAlgo.substr(2); + } + auto hashType = parseHashType(hashAlgo); + return { method, hashType }; + }; + + if (keys == (std::set<std::string_view> { "path" })) { + return DerivationOutput::InputAddressed { + .path = store.parseStorePath((std::string) json["path"]), + }; + } + + else if (keys == (std::set<std::string_view> { "path", "hashAlgo", "hash" })) { + auto [method, hashType] = methodAlgo(); + auto dof = DerivationOutput::CAFixed { + .hash = { + .method = 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"); + return dof; + } + + else if (keys == (std::set<std::string_view> { "hashAlgo" })) { + auto [method, hashType] = methodAlgo(); + return DerivationOutput::CAFloating { + .method = method, + .hashType = hashType, + }; + } + + else if (keys == (std::set<std::string_view> { })) { + return DerivationOutput::Deferred {}; + } + + else if (keys == (std::set<std::string_view> { "hashAlgo", "impure" })) { + auto [method, hashType] = methodAlgo(); + return DerivationOutput::Impure { + .method = method, + .hashType = hashType, + }; + } + + else { + throw Error("invalid JSON for derivation output"); + } +} + + nlohmann::json Derivation::toJSON(const Store & store) const { nlohmann::json res = nlohmann::json::object(); + res["name"] = name; + { nlohmann::json & outputsObj = res["outputs"]; outputsObj = nlohmann::json::object(); @@ -950,4 +1089,43 @@ nlohmann::json Derivation::toJSON(const Store & store) const return res; } + +Derivation Derivation::fromJSON( + const Store & store, + const nlohmann::json & json) +{ + Derivation res; + + res.name = json["name"]; + + { + auto & outputsObj = json["outputs"]; + for (auto & [outputName, output] : outputsObj.items()) { + res.outputs.insert_or_assign( + outputName, + DerivationOutput::fromJSON(store, res.name, outputName, output)); + } + } + + { + auto & inputsList = json["inputSrcs"]; + for (auto & input : inputsList) + res.inputSrcs.insert(store.parseStorePath(static_cast<const std::string &>(input))); + } + + { + auto & inputDrvsObj = json["inputDrvs"]; + for (auto & [inputDrvPath, inputOutputs] : inputDrvsObj.items()) + res.inputDrvs[store.parseStorePath(inputDrvPath)] = + static_cast<const StringSet &>(inputOutputs); + } + + res.platform = json["system"]; + res.builder = json["builder"]; + res.args = json["args"]; + res.env = json["env"]; + + return res; +} + } |