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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/>. */
+
+#include <builtins.hh>
+#include <util.hh>
+#include <globals.hh>
+
+#include <unistd.h>
+
+namespace nix {
+
+static void builtinDownload(const Derivation &drv,
+ const std::string &drvPath)
+{
+ /* Invoke 'guix perform-download'. */
+ Strings args;
+ args.push_back("perform-download");
+ args.push_back(drvPath);
+
+ /* Close all other file descriptors. */
+ closeMostFDs(set<int>());
+
+ const char *const argv[] = { "download", drvPath.c_str(), NULL };
+
+ /* XXX: Hack our way to use the 'download' script from 'LIBEXECDIR/guix'
+ or just 'LIBEXECDIR', depending on whether we're running uninstalled or
+ not. */
+ const string subdir = getenv("GUIX_UNINSTALLED") != NULL
+ ? "" : "/guix";
+
+ const string program = settings.nixLibexecDir + subdir + "/download";
+ execv(program.c_str(), (char *const *) argv);
+
+ throw SysError(format("failed to run download program '%1%'") % program);
+}
+
+static const std::map<std::string, derivationBuilder> builtins =
+{
+ { "download", builtinDownload }
+};
+
+derivationBuilder lookupBuiltinBuilder(const std::string & name)
+{
+ if (name.substr(0, 8) == "builtin:")
+ {
+ auto realName = name.substr(8);
+ auto builder = builtins.find(realName);
+ return builder == builtins.end() ? NULL : builder->second;
+ }
+ else
+ return NULL;
+}
+
+}