build: Include a copy of Nix's libstore and daemon; build it.

* configure.ac: Call `AC_USE_SYSTEM_EXTENSIONS', and
  `GUIX_SYSTEM_TYPE'.  Add `--with-store-dir' option, and substitute
  `storedir'.  Include `config-daemon.ac'.
* config-daemon.ac: New file.
* Makefile.am [BUILD_DAEMON]: Include `daemon.am'.
* daemon.am: New file.
* m4/guix.m4 (GUIX_SYSTEM_TYPE): New macro.

* nix/libutil/gcrypt-hash.cc, nix/libutil/gcrypt-hash.hh,
  nix/libutil/md5.h, nix/libutil/sha1.h, nix/libutil/sha256.h,
  nix/nix-daemon/guix-daemon.cc, nix/nix-daemon/shared.hh: New files.

2 files changed, 152 insertions, 0 deletions

diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
new file mode 100644
index 0000000000..43d4113493
--- /dev/null
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -0,0 +1,115 @@
+/* Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+   Copyright (C) 2012  Ludovic Courtès <ludo@gnu.org>
+
+   This file is part of Guix.
+
+   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.
+
+   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 Guix.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <types.hh>
+#include "shared.hh"
+#include <globals.hh>
+
+#include <stdlib.h>
+#include <argp.h>
+
+/* Variables used by `nix-daemon.cc'.  */
+volatile ::sig_atomic_t blockInt;
+char **argvSaved;
+
+using namespace nix;
+
+/* Entry point in `nix-daemon.cc'.  */
+extern void run (Strings args);
+
+
+/* Command-line options.  */
+
+const char *argp_program_version =
+  "guix-daemon (" PACKAGE_NAME ") " PACKAGE_VERSION;
+const char *argp_program_bug_address = PACKAGE_BUGREPORT;
+
+static char doc[] =
+"guix-daemon -- perform derivation builds and store accesses\
+\v\
+This program is a daemon meant to run in the background.  It serves \
+requests sent over a Unix-domain socket.  It accesses the store, and \
+builds derivations on behalf of its clients.";
+
+#define GUIX_OPT_SYSTEM 1
+#define GUIX_OPT_DISABLE_CHROOT 2
+#define GUIX_OPT_DISABLE_LOG_COMPRESSION 3
+
+static const struct argp_option options[] =
+  {
+    { "system", GUIX_OPT_SYSTEM, "SYSTEM", 0,
+      "Assume SYSTEM as the current system type" },
+    { "build-cores", 'C', "N", 0,
+      "Use N CPU cores to build each derivation; 0 means as many as available" },
+    { "max-jobs", 'M', "N", 0,
+      "Allow at most N build jobs" },
+    { "disable-chroot", GUIX_OPT_DISABLE_CHROOT, 0, 0,
+      "Disable chroot builds" },
+    { "disable-log-compression", GUIX_OPT_DISABLE_LOG_COMPRESSION, 0, 0,
+      "Disable compression of the build logs" },
+    { 0, 0, 0, 0, 0 }
+  };
+
+/* Parse a single option. */
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+  switch (key)
+    {
+    case GUIX_OPT_DISABLE_CHROOT:
+      settings.useChroot = false;
+      break;
+    case GUIX_OPT_DISABLE_LOG_COMPRESSION:
+      settings.compressLog = false;
+      break;
+    case 'C':
+      settings.buildCores = atoi (arg);
+      break;
+    case 'M':
+      settings.maxBuildJobs = atoi (arg);
+      break;
+    case GUIX_OPT_SYSTEM:
+      settings.thisSystem = arg;
+      break;
+    default:
+      return ARGP_ERR_UNKNOWN;
+    }
+
+  return 0;
+}
+
+/* Argument parsing.  */
+static struct argp argp = { options, parse_opt, 0, doc };
+
+
+
+int
+main (int argc, char *argv[])
+{
+  Strings nothing;
+
+  settings.useChroot = true;
+  settings.processEnvironment ();
+
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+
+  argvSaved = argv;
+  run (nothing);
+}
diff --git a/nix/nix-daemon/shared.hh b/nix/nix-daemon/shared.hh
new file mode 100644
index 0000000000..a03c09c036
--- /dev/null
+++ b/nix/nix-daemon/shared.hh
@@ -0,0 +1,37 @@
+/* Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+   Copyright (C) 2012  Ludovic Courtès <ludo@gnu.org>
+
+   This file is part of Guix.
+
+   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.
+
+   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 Guix.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Replacement for Nix's libmain/shared.hh.  */
+
+#pragma once
+
+#include <string>
+
+#include <stdlib.h>
+#include <signal.h>
+
+static inline void
+showManPage (const char *name)
+{
+  /* This idea is evil.  Abort.  */
+  abort ();
+}
+
+extern volatile ::sig_atomic_t blockInt;
+
+extern char **argvSaved;