bbe97dff8b
Most functions now take a StorePath argument rather than a Path (which is just an alias for std::string). The StorePath constructor ensures that the path is syntactically correct (i.e. it looks like <store-dir>/<base32-hash>-<name>). Similarly, functions like buildPaths() now take a StorePathWithOutputs, rather than abusing Path by adding a '!<outputs>' suffix. Note that the StorePath type is implemented in Rust. This involves some hackery to allow Rust values to be used directly in C++, via a helper type whose destructor calls the Rust type's drop() function. The main issue is the dynamic nature of C++ move semantics: after we have moved a Rust value, we should not call the drop function on the original value. So when we move a value, we set the original value to bitwise zero, and the destructor only calls drop() if the value is not bitwise zero. This should be sufficient for most types. Also lots of minor cleanups to the C++ API to make it more modern (e.g. using std::optional and std::string_view in some places).
108 lines
2.9 KiB
C++
108 lines
2.9 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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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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DerivationOutput(StorePath && path, std::string && hashAlgo, std::string && hash)
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: path(std::move(path))
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, hashAlgo(std::move(hashAlgo))
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, hash(std::move(hash))
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{ }
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void parseHashInfo(bool & 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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explicit BasicDerivation(const BasicDerivation & other);
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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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};
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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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Derivation(Derivation && other) = default;
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explicit Derivation(const Derivation & other);
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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, const string & 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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Hash hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutputs);
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/* Memoisation of hashDerivationModulo(). */
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typedef std::map<StorePath, Hash> 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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