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+/* GNU Guix --- Functional package management for GNU
+ Copyright (C) 2016 Ludovic Courtès <ludo@gnu.org>
+
+ This file is part of GNU Guix.
+
+ GNU Guix is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or (at
+ your option) any later version.
+
+ GNU Guix is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Interface to built-in derivation builders. */
+
+#pragma once
+
+#include <derivations.hh>
+#include <map>
+#include <string>
+
+namespace nix {
+
+ inline bool isBuiltin(const Derivation & drv)
+ {
+ return string(drv.builder, 0, 8) == "builtin:";
+ }
+
+ /* Build DRV, which lives at DRVPATH. */
+ typedef void (*derivationBuilder) (const Derivation &drv,
+ const std::string &drvPath);
+
+ /* Return the built-in builder called BUILDER, or NULL if none was
+ found. */
+ derivationBuilder lookupBuiltinBuilder(const std::string &builder);
+}