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8d8d47abd2
If a derivation has multiple outputs, then we only want to download
those outputs that are actuallty needed. So if we do "nix-build -A
openssl.man", then only the "man" output should be downloaded.
Likewise if another package depends on ${openssl.man}.
The tricky part is that different derivations can depend on different
outputs of a given derivation, so we may need to restart the
corresponding derivation goal if that happens.
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
#pragma once
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#include "types.hh"
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#include "hash.hh"
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#include <map>
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namespace nix {
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/* Extension of derivations in the Nix store. */
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const string drvExtension = ".drv";
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/* Abstract syntax of derivations. */
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struct DerivationOutput
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{
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Path path;
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string hashAlgo; /* hash used for expected hash computation */
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string hash; /* expected hash, may be null */
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DerivationOutput()
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{
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}
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DerivationOutput(Path path, string hashAlgo, string hash)
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{
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this->path = path;
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this->hashAlgo = hashAlgo;
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this->hash = hash;
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}
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void parseHashInfo(bool & recursive, HashType & hashType, 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<Path, StringSet> DerivationInputs;
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typedef std::map<string, string> StringPairs;
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struct Derivation
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{
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DerivationOutputs outputs; /* keyed on symbolic IDs */
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DerivationInputs inputDrvs; /* inputs that are sub-derivations */
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PathSet 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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};
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class StoreAPI;
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/* Write a derivation to the Nix store, and return its path. */
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Path writeDerivation(StoreAPI & store,
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const Derivation & drv, const string & name, bool repair = false);
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/* Parse a derivation. */
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Derivation parseDerivation(const string & s);
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/* Print a derivation. */
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string unparseDerivation(const Derivation & drv);
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/* Check whether a file name ends with the extensions for
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derivations. */
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bool isDerivation(const string & fileName);
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/* Return true iff this is a fixed-output derivation. */
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bool isFixedOutputDrv(const Derivation & drv);
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Hash hashDerivationModulo(StoreAPI & store, Derivation drv);
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/* Memoisation of hashDerivationModulo(). */
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typedef std::map<Path, Hash> DrvHashes;
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extern DrvHashes drvHashes;
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/* Split a string specifying a derivation and a set of outputs
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(/nix/store/hash-foo!out1,out2,...) into the derivation path and
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the outputs. */
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typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
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DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
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Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);
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bool wantOutput(const string & output, const std::set<string> & wanted);
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}
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