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22d6e31fc6
For example, you can now say:
configureFlags = "--prefix=${placeholder "out"} --includedir=${placeholder "dev"}";
The strings returned by the ‘placeholder’ builtin are replaced at
build time by the actual store paths corresponding to the specified
outputs.
Previously, you had to work around the inability to self-reference by doing stuff like:
preConfigure = ''
configureFlags+=" --prefix $out --includedir=$dev"
'';
or rely on ad-hoc variable interpolation semantics in Autoconf or Make
(e.g. --prefix=\$(out)), which doesn't always work.
123 lines
3 KiB
C++
123 lines
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, 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 BasicDerivation
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{
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DerivationOutputs outputs; /* keyed on symbolic IDs */
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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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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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Path findOutput(const string & id) const;
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bool willBuildLocally() const;
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bool substitutesAllowed() const;
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bool isBuiltin() const;
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bool canBuildLocally() 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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PathSet 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;
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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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Path writeDerivation(ref<Store> store,
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const Derivation & drv, const string & name, bool repair = false);
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/* Read a derivation from a file. */
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Derivation readDerivation(const Path & drvPath);
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/* Check whether a file name ends with the extension for
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derivations. */
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bool isDerivation(const string & fileName);
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Hash hashDerivationModulo(Store & 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; // FIXME: global, not thread-safe
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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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struct Source;
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struct Sink;
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Source & readDerivation(Source & in, Store & store, BasicDerivation & drv);
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Sink & operator << (Sink & out, const BasicDerivation & drv);
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std::string hashPlaceholder(const std::string & outputName);
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}
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