forked from lix-project/lix
863dcff6c5
representation of closures as ATerms in the Nix store. Instead, the
file system pointer graph is now stored in the Nix database. This
has many advantages:
- It greatly simplifies the implementation (we can drop the notion
of `successors', and so on).
- It makes registering roots for the garbage collector much easier.
Instead of specifying the closure expression as a root, you can
simply specify the store path that must be retained as a root.
This could not be done previously, since there was no way to find
the closure store expression containing a given store path.
- Better traceability: it is now possible to query what paths are
referenced by a path, and what paths refer to a path.
90 lines
2.5 KiB
C++
90 lines
2.5 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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/* 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 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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/* Deregister all substitutes. */
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void clearSubstitutes();
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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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/* Sets the set of outgoing FS references for a store path. */
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void setReferences(const Transaction & txn, const Path & storePath,
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const PathSet & references);
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/* Queries the set of outgoing FS references for a store path. The
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result is not cleared. */
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void queryReferences(const Path & storePath, PathSet & references);
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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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/* 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 contents written to the output path is a
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regular file containing the given string. */
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Path addTextToStore(const string & suffix, 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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