47 lines
1.8 KiB
C++
47 lines
1.8 KiB
C++
#ifndef __NORMALISE_H
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#define __NORMALISE_H
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#include "expr.hh"
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/* Normalise a Nix expression. That is, if the expression is a
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derivation, a path containing an equivalent closure expression is
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returned. This requires that the derivation is performed, unless a
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successor is known. */
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Path normaliseNixExpr(const Path & nePath, PathSet pending = PathSet());
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/* Realise a closure expression in the file system.
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The pending paths are those that are already being realised. This
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prevents infinite recursion for paths realised through a substitute
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(since when we build the substitute, we would first try to realise
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its output paths through substitutes... kaboom!). */
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void realiseClosure(const Path & nePath, PathSet pending = PathSet());
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/* Ensure that a path exists, possibly by instantiating it by
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realising a substitute. */
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void ensurePath(const Path & path, PathSet pending = PathSet());
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/* Read a Nix expression, after ensuring its existence through
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ensurePath(). */
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NixExpr exprFromPath(const Path & path, PathSet pending = PathSet());
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/* Get the list of root (output) paths of the given Nix expression. */
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PathSet nixExprRoots(const Path & nePath);
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/* Get the list of paths that are required to realise the given
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expression. For a derive expression, this is the union of
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requisites of the inputs; for a closure expression, it is the path of
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each element in the closure. If `includeExprs' is true, include the
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paths of the Nix expressions themselves. If `includeSuccessors' is
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true, include the requisites of successors. */
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PathSet nixExprRequisites(const Path & nePath,
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bool includeExprs, bool includeSuccessors);
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/* Return the list of the paths of all known Nix expressions whose
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output paths are completely contained in the set `outputs'. */
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PathSet findGenerators(const PathSet & outputs);
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#endif /* !__NORMALISE_H */
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