0565b5f2b3
* Added new operation hasSubstitutes(), which is more efficient than querySubstitutes().size() > 0.
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
#ifndef __STOREAPI_H
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#define __STOREAPI_H
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#include <string>
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#include <boost/shared_ptr.hpp>
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#include "hash.hh"
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namespace nix {
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/* A substitute is a program invocation that constructs some store
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path (typically by fetching it from somewhere, e.g., from the
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network). */
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struct Substitute
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{
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/* The derivation that built this store path (empty if none). */
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Path deriver;
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/* Program to be executed to create the store path. Must be in
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the output path of `storeExpr'. */
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Path program;
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/* Extra arguments to be passed to the program (the first argument
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is the store path to be substituted). */
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Strings args;
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bool operator == (const Substitute & sub) const;
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};
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typedef list<Substitute> Substitutes;
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class StoreAPI
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{
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public:
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virtual ~StoreAPI() { }
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/* Checks whether a path is valid. */
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virtual bool isValidPath(const Path & path) = 0;
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/* Return the substitutes for the given path. */
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virtual Substitutes querySubstitutes(const Path & path) = 0;
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/* More efficient variant if we just want to know if a path has
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substitutes. */
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virtual bool hasSubstitutes(const Path & path);
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/* Queries the hash of a valid path. */
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virtual Hash queryPathHash(const Path & path) = 0;
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/* Queries the set of outgoing FS references for a store path.
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The result is not cleared. */
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virtual void queryReferences(const Path & storePath,
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PathSet & references) = 0;
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/* Queries the set of incoming FS references for a store path.
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The result is not cleared. */
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virtual void queryReferrers(const Path & storePath,
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PathSet & referrers) = 0;
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/* Copy the contents of a path to the store and register the
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validity the resulting path. The resulting path is
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returned. */
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virtual Path addToStore(const Path & srcPath) = 0;
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/* Like addToStore(), but for pre-adding the outputs of
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fixed-output derivations. */
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virtual Path addToStoreFixed(bool recursive, string hashAlgo,
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const Path & srcPath) = 0;
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/* Like addToStore, but the contents written to the output path is
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a regular file containing the given string. */
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virtual Path addTextToStore(const string & suffix, const string & s,
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const PathSet & references) = 0;
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/* Ensure that the output paths of the derivation are valid. If
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they are already valid, this is a no-op. Otherwise, validity
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can be reached in two ways. First, if the output paths have
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substitutes, then those can be used. Second, the output paths
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can be created by running the builder, after recursively
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building any sub-derivations. */
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virtual void buildDerivations(const PathSet & drvPaths) = 0;
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/* Ensure that a path is valid. If it is not currently valid, it
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may be made valid by running a substitute (if defined for the
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path). */
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virtual void ensurePath(const Path & storePath) = 0;
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};
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/* !!! These should be part of the store API, I guess. */
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/* Throw an exception if `path' is not directly in the Nix store. */
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void assertStorePath(const Path & path);
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bool isInStore(const Path & path);
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bool isStorePath(const Path & path);
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void checkStoreName(const string & name);
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/* Chop off the parts after the top-level store name, e.g.,
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/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
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Path toStorePath(const Path & path);
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/* Constructs a unique store path name. */
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Path makeStorePath(const string & type,
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const Hash & hash, const string & suffix);
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Path makeFixedOutputPath(bool recursive,
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string hashAlgo, Hash hash, string name);
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/* For now, there is a single global store API object, but we'll
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purify that in the future. */
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extern boost::shared_ptr<StoreAPI> store;
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/* Factory method: open the Nix database, either through the local or
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remote implementation. */
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boost::shared_ptr<StoreAPI> openStore(bool reserveSpace = true);
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}
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#endif /* !__STOREAPI_H */
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