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https://git.in.rschanz.org/ryan77627/guix.git
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94d92c7796
This ensures that 1) the derivation doesn't change when Guix changes; 2) the derivation closure doesn't contain Guix and its dependencies; 3) we don't have to rely on ugly chroot hacks. Adapted from Nix commit 0a2bee307b20411f5b0dda0c662b1f9bb9e0e131. * nix/libstore/build.cc (DerivationGoal::runChild): Add special case for 'isBuiltin(drv)'. Disable chroot when 'isBuiltin(drv)'. * nix/libstore/builtins.cc, nix/libstore/builtins.hh, nix/scripts/download.in, guix/scripts/perform-download.scm: New files. * guix/ui.scm (show-guix-help)[internal?]: Add 'perform-download'. * nix/local.mk (libstore_a_SOURCES): Add builtins.cc. (libstore_headers): Add builtins.hh. (nodist_pkglibexec_SCRIPTS): Add 'scripts/download'. * config-daemon.ac: Emit 'scripts/download'. * Makefile.am (MODULES): Add 'guix/scripts/perform-download.scm'. * tests/derivations.scm ("unknown built-in builder") ("'download' built-in builder") ("'download' built-in builder, invalid hash") ("'download' built-in builder, not found") ("'download' built-in builder, not fixed-output"): New tests. Co-authored-by: Eelco Dolstra <eelco.dolstra@logicblox.com>
69 lines
2 KiB
C++
69 lines
2 KiB
C++
/* GNU Guix --- Functional package management for GNU
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Copyright (C) 2016 Ludovic Courtès <ludo@gnu.org>
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This file is part of GNU Guix.
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GNU Guix is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at
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your option) any later version.
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GNU Guix is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. */
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#include <builtins.hh>
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#include <util.hh>
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#include <globals.hh>
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#include <unistd.h>
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namespace nix {
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static void builtinDownload(const Derivation &drv,
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const std::string &drvPath)
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{
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/* Invoke 'guix perform-download'. */
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Strings args;
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args.push_back("perform-download");
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args.push_back(drvPath);
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/* Close all other file descriptors. */
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closeMostFDs(set<int>());
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const char *const argv[] = { "download", drvPath.c_str(), NULL };
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/* XXX: Hack our way to use the 'download' script from 'LIBEXECDIR/guix'
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or just 'LIBEXECDIR', depending on whether we're running uninstalled or
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not. */
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const string subdir = getenv("GUIX_UNINSTALLED") != NULL
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? "" : "/guix";
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const string program = settings.nixLibexecDir + subdir + "/download";
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execv(program.c_str(), (char *const *) argv);
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throw SysError(format("failed to run download program '%1%'") % program);
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}
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static const std::map<std::string, derivationBuilder> builtins =
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{
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{ "download", builtinDownload }
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};
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derivationBuilder lookupBuiltinBuilder(const std::string & name)
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{
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if (name.substr(0, 8) == "builtin:")
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{
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auto realName = name.substr(8);
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auto builder = builtins.find(realName);
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return builder == builtins.end() ? NULL : builder->second;
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}
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else
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return NULL;
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}
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}
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