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/* GNU Guix --- Functional package management for GNU
Copyright (C) 2016, 2017, 2018 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>
#include <cstdlib>
namespace nix {
static void builtinDownload(const Derivation &drv,
const std::string &drvPath,
const std::string &output)
{
/* 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(), output.c_str(), NULL
};
/* Tell the script what the store file name is, so that
'strip-store-file-name' (used for instance to determine the URL of
content-addressed mirrors) works correctly. */
setenv("NIX_STORE", settings.nixStore.c_str(), 1);
/* Tell it about options such as "print-extended-build-trace". */
setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
/* 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;
}
std::list<std::string> builtinBuilderNames()
{
std::list<std::string> result;
for(auto&& iter: builtins)
{
result.push_back(iter.first);
}
return result;
}
}
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