forked from lix-project/lix
101 lines
3 KiB
C++
101 lines
3 KiB
C++
#ifndef __STORE_H
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#define __STORE_H
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#include <string>
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#include "hash.hh"
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#include "db.hh"
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using namespace std;
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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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/* Store expression to be normalised and realised in order to
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obtain `program'. */
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Path storeExpr;
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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);
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};
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typedef list<Substitute> Substitutes;
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/* Open the database environment. */
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void openDB();
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/* Create the required database tables. */
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void initDB();
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/* Get a transaction object. */
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void createStoreTransaction(Transaction & txn);
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/* Copy a path recursively. */
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void copyPath(const Path & src, const Path & dst);
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/* Register a successor. This function accepts a transaction handle
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so that it can be enclosed in an atomic operation with calls to
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registerValidPath(). This must be atomic, since if we register a
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successor for a derivation without registering the paths built in
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the derivation, we have a successor with dangling pointers, and if
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we do it in reverse order, we can get an obstructed build (since to
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rebuild the successor, the outputs paths must not exist). */
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void registerSuccessor(const Transaction & txn,
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const Path & srcPath, const Path & sucPath);
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/* Remove a successor mapping. */
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void unregisterSuccessor(const Path & srcPath);
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/* Return the predecessors of the Nix expression stored at the given
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path. */
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bool querySuccessor(const Path & srcPath, Path & sucPath);
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/* Return the predecessors of the Nix expression stored at the given
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path. */
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Paths queryPredecessors(const Path & sucPath);
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/* Register a substitute. */
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typedef list<pair<Path, Substitute> > SubstitutePairs;
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void registerSubstitutes(const Transaction & txn,
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const SubstitutePairs & subPairs);
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/* Return the substitutes expression for the given path. */
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Substitutes querySubstitutes(const Path & srcPath);
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/* Register the validity of a path. */
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void registerValidPath(const Transaction & txn, const Path & path);
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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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/* Checks whether a path is valid. */
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bool isValidPath(const Path & path);
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/* Copy the contents of a path to the store and register the validity
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the resulting path. The resulting path is returned. */
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Path addToStore(const Path & srcPath);
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/* Like addToStore, but the path of the output is given, and the
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contents written to the output path is a regular file containing
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the given string. */
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void addTextToStore(const Path & dstPath, const string & s);
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/* Delete a value from the nixStore directory. */
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void deleteFromStore(const Path & path);
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void verifyStore();
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#endif /* !__STORE_H */
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