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Whenever Nix attempts to realise a derivation for which a closure is already known, but this closure cannot be realised, fall back on normalising the derivation. The most common scenario in which this is useful is when we have registered substitutes in order to perform binary distribution from, say, a network repository. If the repository is down, the realisation of the derivation will fail. When this option is specified, Nix will build the derivation instead. Thus, binary installation falls back on a source installation. This option is not the default since it is generally not desirable for a transient failure in obtaining the substitutes to lead to a full build from source (with the related consumption of resources).
100 lines
3 KiB
C++
100 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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void registerSubstitute(const Transaction & txn,
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const Path & srcPath, const Substitute & sub);
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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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