forked from lix-project/lix
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
#pragma once
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#include "types.hh"
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#include "hash.hh"
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#include "store-api.hh"
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#include <map>
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#include <variant>
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namespace nix {
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/* Abstract syntax of derivations. */
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struct DerivationOutput
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{
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StorePath path;
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std::string hashAlgo; /* hash used for expected hash computation */
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std::string hash; /* expected hash, may be null */
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void parseHashInfo(FileIngestionMethod & recursive, Hash & hash) const;
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};
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typedef std::map<string, DerivationOutput> DerivationOutputs;
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/* For inputs that are sub-derivations, we specify exactly which
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output IDs we are interested in. */
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typedef std::map<StorePath, StringSet> DerivationInputs;
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typedef std::map<string, string> StringPairs;
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struct BasicDerivation
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{
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DerivationOutputs outputs; /* keyed on symbolic IDs */
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StorePathSet inputSrcs; /* inputs that are sources */
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string platform;
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Path builder;
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Strings args;
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StringPairs env;
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BasicDerivation() { }
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virtual ~BasicDerivation() { };
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/* Return the path corresponding to the output identifier `id' in
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the given derivation. */
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const StorePath & findOutput(const std::string & id) const;
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bool isBuiltin() const;
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/* Return true iff this is a fixed-output derivation. */
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bool isFixedOutput() const;
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/* Return the output paths of a derivation. */
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StorePathSet outputPaths() const;
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/* Return the output names of a derivation. */
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StringSet outputNames() const;
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};
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struct Derivation : BasicDerivation
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{
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DerivationInputs inputDrvs; /* inputs that are sub-derivations */
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/* Print a derivation. */
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std::string unparse(const Store & store, bool maskOutputs,
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std::map<std::string, StringSet> * actualInputs = nullptr) const;
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Derivation() { }
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};
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class Store;
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/* Write a derivation to the Nix store, and return its path. */
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StorePath writeDerivation(ref<Store> store,
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const Derivation & drv, std::string_view name, RepairFlag repair = NoRepair);
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/* Read a derivation from a file. */
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Derivation readDerivation(const Store & store, const Path & drvPath);
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// FIXME: remove
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bool isDerivation(const string & fileName);
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typedef std::variant<
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Hash, // regular DRV normalized hash
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std::map<std::string, Hash> // known CA drv's output hashes
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> DrvHashModulo;
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/* Returns hashes with the details of fixed-output subderivations
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expunged.
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A fixed-output derivation is a derivation whose outputs have a
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specified content hash and hash algorithm. (Currently they must have
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exactly one output (`out'), which is specified using the `outputHash'
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and `outputHashAlgo' attributes, but the algorithm doesn't assume
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this.) We don't want changes to such derivations to propagate upwards
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through the dependency graph, changing output paths everywhere.
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For instance, if we change the url in a call to the `fetchurl'
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function, we do not want to rebuild everything depending on it---after
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all, (the hash of) the file being downloaded is unchanged. So the
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*output paths* should not change. On the other hand, the *derivation
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paths* should change to reflect the new dependency graph.
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For fixed-output derivations, this returns a map from the name of
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each output to its hash, unique up to the output's contents.
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For regular derivations, it returns a single hash of the derivation
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ATerm, after subderivations have been likewise expunged from that
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derivation.
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*/
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DrvHashModulo hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutputs);
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/* Memoisation of hashDerivationModulo(). */
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typedef std::map<StorePath, DrvHashModulo> DrvHashes;
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extern DrvHashes drvHashes; // FIXME: global, not thread-safe
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bool wantOutput(const string & output, const std::set<string> & wanted);
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struct Source;
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struct Sink;
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Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv);
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void writeDerivation(Sink & out, const Store & store, const BasicDerivation & drv);
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std::string hashPlaceholder(const std::string & outputName);
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}
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