5f74169e8e
* nix/nix-daemon/guix-daemon.cc (SD_LISTEN_FDS_START): New macro. (systemd_activation_sockets): New function. (main): Use it. Remove obsolete 'printMsg' call. * doc/guix.texi (Invoking guix-daemon): Document socket activation.
578 lines
17 KiB
C++
578 lines
17 KiB
C++
/* GNU Guix --- Functional package management for GNU
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Copyright (C) 2012-2019, 2021-2022 Ludovic Courtès <ludo@gnu.org>
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Copyright (C) 2006, 2010, 2012, 2014 Eelco Dolstra <e.dolstra@tudelft.nl>
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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 <config.h>
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#include <types.hh>
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#include "shared.hh"
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#include <globals.hh>
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#include <util.hh>
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#include <gcrypt.h>
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#include <stdlib.h>
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#include <argp.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netdb.h>
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#include <strings.h>
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#include <exception>
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#include <iostream>
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#include <libintl.h>
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#include <locale.h>
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/* Variables used by `nix-daemon.cc'. */
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volatile ::sig_atomic_t blockInt;
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char **argvSaved;
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using namespace nix;
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/* Entry point in `nix-daemon.cc'. */
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extern void run (const std::vector<int> &);
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/* Command-line options. */
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#define n_(str) str
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#define _(str) gettext (str)
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static const char guix_textdomain[] = "guix";
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const char *argp_program_version =
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"guix-daemon (" PACKAGE_NAME ") " PACKAGE_VERSION;
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const char *argp_program_bug_address = PACKAGE_BUGREPORT;
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static char doc[] =
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n_("guix-daemon -- perform derivation builds and store accesses")
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"\v\n"
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n_("This program is a daemon meant to run in the background. It serves \
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requests sent over a Unix-domain socket. It accesses the store, and \
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builds derivations on behalf of its clients.");
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#define GUIX_OPT_SYSTEM 1
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#define GUIX_OPT_DISABLE_CHROOT 2
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#define GUIX_OPT_BUILD_USERS_GROUP 3
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#define GUIX_OPT_CACHE_FAILURES 4
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#define GUIX_OPT_LOSE_LOGS 5
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#define GUIX_OPT_DISABLE_LOG_COMPRESSION 6
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#define GUIX_OPT_DISABLE_DEDUPLICATION 7
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#define GUIX_OPT_IMPERSONATE_LINUX_26 8
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#define GUIX_OPT_DEBUG 9
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#define GUIX_OPT_CHROOT_DIR 10
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#define GUIX_OPT_LISTEN 11
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#define GUIX_OPT_NO_SUBSTITUTES 12
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#define GUIX_OPT_SUBSTITUTE_URLS 13
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#define GUIX_OPT_NO_BUILD_HOOK 14
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#define GUIX_OPT_GC_KEEP_OUTPUTS 15
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#define GUIX_OPT_GC_KEEP_DERIVATIONS 16
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#define GUIX_OPT_BUILD_ROUNDS 17
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#define GUIX_OPT_TIMEOUT 18
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#define GUIX_OPT_MAX_SILENT_TIME 19
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#define GUIX_OPT_LOG_COMPRESSION 20
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#define GUIX_OPT_DISCOVER 21
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static const struct argp_option options[] =
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{
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{ "system", GUIX_OPT_SYSTEM, n_("SYSTEM"), 0,
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n_("assume SYSTEM as the current system type") },
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{ "cores", 'c', n_("N"), 0,
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n_("use N CPU cores to build each derivation; 0 means as many as available")
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},
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{ "max-jobs", 'M', n_("N"), 0,
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n_("allow at most N build jobs") },
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{ "timeout", GUIX_OPT_TIMEOUT, n_("SECONDS"), 0,
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n_("mark builds as failed after SECONDS of activity") },
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{ "max-silent-time", GUIX_OPT_MAX_SILENT_TIME, n_("SECONDS"), 0,
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n_("mark builds as failed after SECONDS of silence") },
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{ "disable-chroot", GUIX_OPT_DISABLE_CHROOT, 0, 0,
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n_("disable chroot builds") },
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{ "chroot-directory", GUIX_OPT_CHROOT_DIR, n_("DIR"), 0,
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n_("add DIR to the build chroot") },
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{ "build-users-group", GUIX_OPT_BUILD_USERS_GROUP, n_("GROUP"), 0,
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n_("perform builds as a user of GROUP") },
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{ "no-substitutes", GUIX_OPT_NO_SUBSTITUTES, 0, 0,
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n_("do not use substitutes") },
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{ "substitute-urls", GUIX_OPT_SUBSTITUTE_URLS, n_("URLS"), 0,
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n_("use URLS as the default list of substitute providers") },
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{ "no-offload", GUIX_OPT_NO_BUILD_HOOK, 0, 0,
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n_("do not attempt to offload builds") },
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{ "no-build-hook", GUIX_OPT_NO_BUILD_HOOK, 0,
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OPTION_HIDDEN, // deprecated
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n_("do not attempt to offload builds") },
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{ "cache-failures", GUIX_OPT_CACHE_FAILURES, 0, 0,
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n_("cache build failures") },
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{ "rounds", GUIX_OPT_BUILD_ROUNDS, "N", 0,
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n_("build each derivation N times in a row") },
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{ "lose-logs", GUIX_OPT_LOSE_LOGS, 0, 0,
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n_("do not keep build logs") },
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{ "disable-log-compression", GUIX_OPT_DISABLE_LOG_COMPRESSION, 0,
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OPTION_HIDDEN, // deprecated
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n_("disable compression of the build logs") },
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{ "log-compression", GUIX_OPT_LOG_COMPRESSION, "TYPE", 0,
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n_("use the specified compression type for build logs") },
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{ "discover", GUIX_OPT_DISCOVER, "yes/no", OPTION_ARG_OPTIONAL,
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n_("use substitute servers discovered on the local network") },
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/* '--disable-deduplication' was known as '--disable-store-optimization'
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up to Guix 0.7 included, so keep the alias around. */
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{ "disable-deduplication", GUIX_OPT_DISABLE_DEDUPLICATION, 0, 0,
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n_("disable automatic file \"deduplication\" in the store") },
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{ "disable-store-optimization", GUIX_OPT_DISABLE_DEDUPLICATION, 0,
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OPTION_ALIAS | OPTION_HIDDEN, NULL },
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{ "impersonate-linux-2.6", GUIX_OPT_IMPERSONATE_LINUX_26, 0,
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#ifdef HAVE_SYS_PERSONALITY_H
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0,
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#else
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OPTION_HIDDEN,
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#endif
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n_("impersonate Linux 2.6")
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},
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{ "gc-keep-outputs", GUIX_OPT_GC_KEEP_OUTPUTS,
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"yes/no", OPTION_ARG_OPTIONAL,
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n_("tell whether the GC must keep outputs of live derivations") },
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{ "gc-keep-derivations", GUIX_OPT_GC_KEEP_DERIVATIONS,
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"yes/no", OPTION_ARG_OPTIONAL,
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n_("tell whether the GC must keep derivations corresponding \
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to live outputs") },
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{ "listen", GUIX_OPT_LISTEN, n_("SOCKET"), 0,
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n_("listen for connections on SOCKET") },
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{ "debug", GUIX_OPT_DEBUG, 0, 0,
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n_("produce debugging output") },
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{ 0, 0, 0, 0, 0 }
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};
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/* Default port for '--listen' on TCP/IP. */
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#define DEFAULT_GUIX_PORT "44146"
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/* List of '--listen' options. */
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static std::list<std::string> listen_options;
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static bool useDiscover = false;
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/* Convert ARG to a Boolean value, or throw an error if it does not denote a
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Boolean. */
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static bool
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string_to_bool (const char *arg, bool dflt = true)
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{
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if (arg == NULL)
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return dflt;
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else if (strcasecmp (arg, "yes") == 0)
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return true;
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else if (strcasecmp (arg, "no") == 0)
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return false;
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else
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throw nix::Error (format ("'%1%': invalid Boolean value") % arg);
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}
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/* Parse a single option. */
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static error_t
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parse_opt (int key, char *arg, struct argp_state *state)
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{
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switch (key)
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{
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case GUIX_OPT_DISABLE_CHROOT:
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settings.useChroot = false;
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break;
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case GUIX_OPT_CHROOT_DIR:
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{
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std::string chroot_dirs;
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chroot_dirs = settings.get ("build-extra-chroot-dirs",
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(std::string) "");
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if (chroot_dirs == "")
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chroot_dirs = arg;
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else
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chroot_dirs = chroot_dirs + " " + arg;
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settings.set("build-extra-chroot-dirs", chroot_dirs);
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break;
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}
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case GUIX_OPT_LOG_COMPRESSION:
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if (strcmp (arg, "none") == 0)
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settings.logCompression = COMPRESSION_NONE;
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else if (strcmp (arg, "gzip") == 0)
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settings.logCompression = COMPRESSION_GZIP;
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#if HAVE_BZLIB_H
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else if (strcmp (arg, "bzip2") == 0)
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settings.logCompression = COMPRESSION_BZIP2;
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#endif
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else
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{
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fprintf (stderr, _("error: %s: unknown compression type\n"), arg);
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exit (EXIT_FAILURE);
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}
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break;
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case GUIX_OPT_DISABLE_LOG_COMPRESSION:
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settings.logCompression = COMPRESSION_NONE;
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break;
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case GUIX_OPT_BUILD_USERS_GROUP:
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settings.buildUsersGroup = arg;
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break;
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case GUIX_OPT_DISABLE_DEDUPLICATION:
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settings.autoOptimiseStore = false;
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break;
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case GUIX_OPT_CACHE_FAILURES:
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settings.cacheFailure = true;
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break;
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case GUIX_OPT_BUILD_ROUNDS:
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{
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char *end;
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unsigned long n = strtoul (arg, &end, 10);
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if (end != arg + strlen (arg))
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{
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fprintf (stderr, _("error: %s: invalid number of rounds\n"), arg);
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exit (EXIT_FAILURE);
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}
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settings.set ("build-repeat", std::to_string (std::max (0UL, n - 1)));
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break;
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}
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case GUIX_OPT_IMPERSONATE_LINUX_26:
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settings.impersonateLinux26 = true;
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break;
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case GUIX_OPT_LOSE_LOGS:
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settings.keepLog = false;
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break;
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case GUIX_OPT_LISTEN:
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listen_options.push_back (arg);
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break;
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case GUIX_OPT_SUBSTITUTE_URLS:
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settings.set ("substitute-urls", arg);
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break;
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case GUIX_OPT_NO_SUBSTITUTES:
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settings.set ("build-use-substitutes", "false");
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break;
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case GUIX_OPT_NO_BUILD_HOOK:
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settings.useBuildHook = false;
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break;
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case GUIX_OPT_DISCOVER:
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useDiscover = string_to_bool (arg);
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settings.set ("discover", useDiscover ? "true" : "false");
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break;
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case GUIX_OPT_DEBUG:
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verbosity = lvlDebug;
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break;
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case GUIX_OPT_GC_KEEP_OUTPUTS:
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settings.gcKeepOutputs = string_to_bool (arg);
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break;
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case GUIX_OPT_GC_KEEP_DERIVATIONS:
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settings.gcKeepDerivations = string_to_bool (arg);
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break;
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case 'c':
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settings.set ("build-cores", arg);
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break;
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case 'M':
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settings.set ("build-max-jobs", arg);
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break;
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case GUIX_OPT_TIMEOUT:
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settings.set ("build-timeout", arg);
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break;
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case GUIX_OPT_MAX_SILENT_TIME:
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settings.set ("build-max-silent-time", arg);
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break;
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case GUIX_OPT_SYSTEM:
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settings.thisSystem = arg;
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break;
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default:
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return (error_t) ARGP_ERR_UNKNOWN;
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}
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return (error_t) 0;
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}
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/* Argument parsing. */
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static const struct argp argp =
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{
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options, parse_opt,
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NULL, doc,
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NULL, NULL, // children and help_filter
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guix_textdomain
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};
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static int
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open_unix_domain_socket (const char *file)
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{
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/* Create and bind to a Unix domain socket. */
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AutoCloseFD fdSocket = socket (PF_UNIX, SOCK_STREAM, 0);
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if (fdSocket == -1)
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throw SysError (_("cannot create Unix domain socket"));
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createDirs (dirOf (file));
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/* Urgh, sockaddr_un allows path names of only 108 characters.
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So chdir to the socket directory so that we can pass a
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relative path name. */
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if (chdir (dirOf (file).c_str ()) == -1)
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throw SysError (_("cannot change current directory"));
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Path fileRel = "./" + baseNameOf (file);
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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if (fileRel.size () >= sizeof (addr.sun_path))
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throw Error (format (_("socket file name '%1%' is too long")) % fileRel);
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strcpy (addr.sun_path, fileRel.c_str ());
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unlink (file);
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/* Make sure that the socket is created with 0666 permission
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(everybody can connect --- provided they have access to the
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directory containing the socket). */
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mode_t oldMode = umask (0111);
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int res = bind (fdSocket, (struct sockaddr *) &addr, sizeof addr);
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umask (oldMode);
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if (res == -1)
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throw SysError (format (_("cannot bind to socket '%1%'")) % file);
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if (chdir ("/") == -1) /* back to the root */
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throw SysError (_("cannot change current directory"));
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if (listen (fdSocket, 5) == -1)
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throw SysError (format (_("cannot listen on socket '%1%'")) % file);
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return fdSocket.borrow ();
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}
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/* Return a listening socket for ADDRESS, which has the given LENGTH. */
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static int
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open_inet_socket (const struct sockaddr *address, socklen_t length)
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{
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AutoCloseFD fd = socket (address->sa_family, SOCK_STREAM, 0);
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if (fd == -1)
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throw SysError (_("cannot create TCP socket"));
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int res = bind (fd, address, length);
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if (res == -1)
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throw SysError (_("cannot bind TCP socket"));
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if (listen (fd, 5) == -1)
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throw SysError (format (_("cannot listen on TCP socket")));
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return fd.borrow ();
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}
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/* Return a list of file descriptors of listening sockets. */
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static std::vector<int>
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listening_sockets (const std::list<std::string> &options)
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{
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std::vector<int> result;
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if (options.empty ())
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{
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/* Open the default Unix-domain socket. */
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auto fd = open_unix_domain_socket (settings.nixDaemonSocketFile.c_str ());
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result.push_back (fd);
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return result;
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}
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/* Open the user-specified sockets. */
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for (const std::string& option: options)
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{
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if (option[0] == '/')
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{
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/* Assume OPTION is the file name of a Unix-domain socket. */
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settings.nixDaemonSocketFile = canonPath (option);
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int fd =
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open_unix_domain_socket (settings.nixDaemonSocketFile.c_str ());
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result.push_back (fd);
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}
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else
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{
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/* Assume OPTIONS has the form "HOST" or "HOST:PORT". */
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auto colon = option.find_last_of (":");
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auto host = colon == std::string::npos
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? option : option.substr (0, colon);
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auto port = colon == std::string::npos
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? DEFAULT_GUIX_PORT
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: option.substr (colon + 1, option.size () - colon - 1);
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struct addrinfo *res, hints;
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memset (&hints, '\0', sizeof hints);
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_NUMERICSERV | AI_ADDRCONFIG;
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int err = getaddrinfo (host.c_str(), port.c_str (),
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&hints, &res);
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if (err != 0)
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throw Error(format ("failed to look up '%1%': %2%")
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% option % gai_strerror (err));
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printMsg (lvlDebug, format ("listening on '%1%', port '%2%'")
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% host % port);
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/* XXX: Pick the first result, RES. */
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result.push_back (open_inet_socket (res->ai_addr,
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res->ai_addrlen));
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freeaddrinfo (res);
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}
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}
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return result;
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}
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/* First file descriptor provided at startup using systemd-style socket
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activation. */
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#define SD_LISTEN_FDS_START 3
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/* Return a list of file descriptors of listening sockets provided following
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the systemd "socket activation" protocol. Return the empty list if we are
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not being socket-activated. */
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static std::vector<int>
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systemd_activation_sockets ()
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{
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std::vector<int> result;
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if (getEnv ("LISTEN_PID") == std::to_string (getpid ()))
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{
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unsigned int fdCount;
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if (string2Int (getEnv ("LISTEN_FDS"), fdCount))
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{
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for (unsigned int i = 0; i < fdCount; i++)
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result.push_back (SD_LISTEN_FDS_START + i);
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}
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}
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return result;
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}
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int
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main (int argc, char *argv[])
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{
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setlocale (LC_ALL, "");
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bindtextdomain (guix_textdomain, LOCALEDIR);
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textdomain (guix_textdomain);
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/* Initialize libgcrypt. */
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if (!gcry_check_version (GCRYPT_VERSION))
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{
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fprintf (stderr, _("error: libgcrypt version mismatch\n"));
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exit (EXIT_FAILURE);
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}
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/* Tell Libgcrypt that initialization has completed, as per the Libgcrypt
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1.6.0 manual (although this does not appear to be strictly needed.) */
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gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
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/* Set the umask so that the daemon does not end up creating group-writable
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files, which would lead to "suspicious ownership or permission" errors.
|
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See <http://lists.gnu.org/archive/html/bug-guix/2013-07/msg00033.html>. */
|
||
umask (S_IWGRP | S_IWOTH);
|
||
|
||
#ifndef HAVE_CHROOT
|
||
# error chroot is assumed to be available
|
||
#endif
|
||
|
||
/* Always use chroots by default. */
|
||
settings.useChroot = true;
|
||
|
||
/* Turn automatic deduplication on by default. */
|
||
settings.autoOptimiseStore = true;
|
||
|
||
/* Default to using as many cores as possible and one job at a time. */
|
||
settings.buildCores = 0;
|
||
settings.maxBuildJobs = 1;
|
||
|
||
argvSaved = argv;
|
||
|
||
try
|
||
{
|
||
settings.processEnvironment ();
|
||
|
||
/* Enable substitutes by default. */
|
||
settings.set ("build-use-substitutes", "true");
|
||
|
||
/* Use our substitute server by default. */
|
||
settings.set ("substitute-urls", GUIX_SUBSTITUTE_URLS);
|
||
|
||
#ifdef HAVE_DAEMON_OFFLOAD_HOOK
|
||
/* Use 'guix offload' for distributed builds by default. */
|
||
settings.useBuildHook = true;
|
||
#else
|
||
/* We are not installing any build hook, so disable it. */
|
||
settings.useBuildHook = false;
|
||
#endif
|
||
|
||
argp_parse (&argp, argc, argv, 0, 0, 0);
|
||
|
||
auto sockets = systemd_activation_sockets ();
|
||
if (sockets.empty ())
|
||
/* We were not "socket-activated" so open the sockets specified by
|
||
LISTEN_OPTIONS. */
|
||
sockets = listening_sockets (listen_options);
|
||
else
|
||
printMsg (lvlInfo,
|
||
format (ngettext ("socket-activated with %1% socket",
|
||
"socket-activated with %1% sockets",
|
||
sockets.size ()))
|
||
% sockets.size ());
|
||
|
||
/* Effect all the changes made via 'settings.set'. */
|
||
settings.update ();
|
||
printMsg(lvlDebug,
|
||
format ("build log compression: %1%") % settings.logCompression);
|
||
|
||
if (geteuid () == 0 && settings.buildUsersGroup.empty ())
|
||
fprintf (stderr, _("warning: daemon is running as root, so \
|
||
using `--build-users-group' is highly recommended\n"));
|
||
|
||
if (settings.useChroot)
|
||
{
|
||
std::string chroot_dirs;
|
||
|
||
chroot_dirs = settings.get ("build-extra-chroot-dirs",
|
||
(std::string) "");
|
||
printMsg (lvlDebug,
|
||
format ("extra chroot directories: '%1%'") % chroot_dirs);
|
||
}
|
||
|
||
if (useDiscover)
|
||
{
|
||
Strings args;
|
||
|
||
args.push_back("guix");
|
||
args.push_back("discover");
|
||
|
||
startProcess([&]() {
|
||
execv(settings.guixProgram.c_str(), stringsToCharPtrs(args).data());
|
||
});
|
||
}
|
||
|
||
printMsg (lvlDebug,
|
||
format ("automatic deduplication set to %1%")
|
||
% settings.autoOptimiseStore);
|
||
|
||
run (sockets);
|
||
}
|
||
catch (std::exception &e)
|
||
{
|
||
fprintf (stderr, _("error: %s\n"), e.what ());
|
||
return EXIT_FAILURE;
|
||
}
|
||
|
||
return EXIT_SUCCESS; /* never reached */
|
||
}
|