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-rw-r--r--nix/libstore/misc.hh38
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diff --git a/nix/libstore/misc.hh b/nix/libstore/misc.hh
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+#pragma once
+
+#include "derivations.hh"
+
+
+namespace nix {
+
+
+/* Read a derivation, after ensuring its existence through
+ ensurePath(). */
+Derivation derivationFromPath(StoreAPI & store, const Path & drvPath);
+
+/* Place in `paths' the set of all store paths in the file system
+ closure of `storePath'; that is, all paths than can be directly or
+ indirectly reached from it. `paths' is not cleared. If
+ `flipDirection' is true, the set of paths that can reach
+ `storePath' is returned; that is, the closures under the
+ `referrers' relation instead of the `references' relation is
+ returned. */
+void computeFSClosure(StoreAPI & store, const Path & path,
+ PathSet & paths, bool flipDirection = false,
+ bool includeOutputs = false, bool includeDerivers = false);
+
+/* Return the path corresponding to the output identifier `id' in the
+ given derivation. */
+Path findOutput(const Derivation & drv, string id);
+
+/* Given a set of paths that are to be built, return the set of
+ derivations that will be built, and the set of output paths that
+ will be substituted. */
+void queryMissing(StoreAPI & store, const PathSet & targets,
+ PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
+ unsigned long long & downloadSize, unsigned long long & narSize);
+
+bool willBuildLocally(const Derivation & drv);
+
+
+}