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95f2123135
The new builder makes it possible to break cycles that occurs when the
fixed-output derivation for the source of a dependency of ‘git’ would
itself depend on ‘git’.
* guix/scripts/perform-download.scm (perform-git-download): New
procedure.
(perform-download): Move fixed-output derivation check to…
(guix-perform-download): … here. Invoke ‘perform-download’ or
‘perform-git-download’ depending on what ‘derivation-builder’ returns.
* nix/libstore/builtins.cc (builtins): Add “git-download”.
* tests/derivations.scm ("built-in-builders"): Update.
("'git-download' built-in builder")
("'git-download' built-in builder, invalid hash")
("'git-download' built-in builder, invalid commit")
("'git-download' built-in builder, not found"): New tests.
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/* GNU Guix --- Functional package management for GNU
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Copyright (C) 2016-2019, 2023 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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#include <cstdlib>
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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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const std::string &output)
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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[] =
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{
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"guix", "perform-download", drvPath.c_str(), output.c_str(), NULL
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};
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/* Tell the script what the store file name is, so that
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'strip-store-file-name' (used for instance to determine the URL of
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content-addressed mirrors) works correctly. */
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setenv("NIX_STORE", settings.nixStore.c_str(), 1);
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/* Tell it about options such as "print-extended-build-trace". */
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setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
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const string program = settings.guixProgram;
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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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{ "git-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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std::list<std::string> builtinBuilderNames()
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{
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std::list<std::string> result;
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for(auto&& iter: builtins)
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{
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result.push_back(iter.first);
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}
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return result;
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}
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}
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