extra/polkit-duktape: for i486 only replacing mozjs78-baed polkit

2 files changed, 1603 insertions, 0 deletions

diff --git a/extra/polkit-duktape/0001-Add-duktape-as-javascript-engine.patch b/extra/polkit-duktape/0001-Add-duktape-as-javascript-engine.patch
new file mode 100644
index 00000000..34ddd2fd
--- /dev/null
+++ b/extra/polkit-duktape/0001-Add-duktape-as-javascript-engine.patch
@@ -0,0 +1,1538 @@
+From b920ce94b3fb3765ea5b35b01639325155cd1609 Mon Sep 17 00:00:00 2001
+From: Wu Xiaotian <yetist@gmail.com>
+Date: Wed, 24 Jul 2019 15:55:17 +0800
+Subject: [PATCH] Add duktape as javascript engine.
+
+---
+ configure.ac                                  |   28 +-
+ src/polkitbackend/Makefile.am                 |   14 +-
+ .../polkitbackendduktapeauthority.c           | 1428 +++++++++++++++++
+ 3 files changed, 1462 insertions(+), 8 deletions(-)
+ create mode 100644 src/polkitbackend/polkitbackendduktapeauthority.c
+
+diff --git a/configure.ac b/configure.ac
+index 4ac2219..d51cfbd 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -80,11 +80,22 @@ PKG_CHECK_MODULES(GLIB, [gmodule-2.0 gio-unix-2.0 >= 2.30.0])
+ AC_SUBST(GLIB_CFLAGS)
+ AC_SUBST(GLIB_LIBS)
+ 
+-PKG_CHECK_MODULES(LIBJS, [mozjs-78])
+-
+-AC_SUBST(LIBJS_CFLAGS)
+-AC_SUBST(LIBJS_CXXFLAGS)
+-AC_SUBST(LIBJS_LIBS)
++dnl ---------------------------------------------------------------------------
++dnl - Check javascript backend
++dnl ---------------------------------------------------------------------------
++AC_ARG_WITH(duktape, AS_HELP_STRING([--with-duktape],[Use Duktape as javascript backend]),with_duktape=yes,with_duktape=no)
++AS_IF([test x${with_duktape} == xyes], [
++  PKG_CHECK_MODULES(LIBJS, [duktape >= 2.0.0 ])
++  AC_SUBST(LIBJS_CFLAGS)
++  AC_SUBST(LIBJS_LIBS)
++], [
++  PKG_CHECK_MODULES(LIBJS, [mozjs-78])
++
++  AC_SUBST(LIBJS_CFLAGS)
++  AC_SUBST(LIBJS_CXXFLAGS)
++  AC_SUBST(LIBJS_LIBS)
++])
++AM_CONDITIONAL(USE_DUKTAPE, [test x$with_duktape == xyes], [Using duktape as javascript engine library])
+ 
+ EXPAT_LIB=""
+ AC_ARG_WITH(expat, [  --with-expat=<dir>      Use expat from here],
+@@ -581,6 +592,13 @@ echo "
+         PAM support:                ${have_pam}
+         systemdsystemunitdir:       ${systemdsystemunitdir}
+         polkitd user:               ${POLKITD_USER}"
++if test "x${with_duktape}" = xyes; then
++echo "
++        Javascript engine:          Duktape"
++else
++echo "
++        Javascript engine:          Mozjs"
++fi
+ 
+ if test "$have_pam" = yes ; then
+ echo "
+diff --git a/src/polkitbackend/Makefile.am b/src/polkitbackend/Makefile.am
+index e48b739..9572b06 100644
+--- a/src/polkitbackend/Makefile.am
++++ b/src/polkitbackend/Makefile.am
+@@ -33,7 +33,7 @@ libpolkit_backend_1_la_SOURCES =                                   			\
+ 	polkitbackendprivate.h								\
+ 	polkitbackendauthority.h		polkitbackendauthority.c		\
+ 	polkitbackendinteractiveauthority.h	polkitbackendinteractiveauthority.c	\
+-	polkitbackendjsauthority.h		polkitbackendjsauthority.cpp		\
++	polkitbackendjsauthority.h				\
+ 	polkitbackendactionpool.h		polkitbackendactionpool.c		\
+ 	polkitbackendactionlookup.h		polkitbackendactionlookup.c		\
+         $(NULL)
+@@ -51,19 +51,27 @@ libpolkit_backend_1_la_CFLAGS =                                        	\
+         -D_POLKIT_BACKEND_COMPILATION                                  	\
+         $(GLIB_CFLAGS)							\
+ 	$(LIBSYSTEMD_CFLAGS)						\
+-	$(LIBJS_CFLAGS)							\
++	$(LIBJS_CFLAGS)						\
+         $(NULL)
+ 
+ libpolkit_backend_1_la_CXXFLAGS = $(libpolkit_backend_1_la_CFLAGS)
+ 
+ libpolkit_backend_1_la_LIBADD =                               		\
+         $(GLIB_LIBS)							\
++        $(DUKTAPE_LIBS)							\
+ 	$(LIBSYSTEMD_LIBS)						\
+ 	$(top_builddir)/src/polkit/libpolkit-gobject-1.la		\
+ 	$(EXPAT_LIBS)							\
+-	$(LIBJS_LIBS)							\
++	$(LIBJS_LIBS)                                                   \
+         $(NULL)
+ 
++if USE_DUKTAPE
++libpolkit_backend_1_la_SOURCES += polkitbackendduktapeauthority.c
++libpolkit_backend_1_la_LIBADD += -lm
++else
++libpolkit_backend_1_la_SOURCES += polkitbackendjsauthority.cpp
++endif
++
+ rulesdir = $(sysconfdir)/polkit-1/rules.d
+ rules_DATA = 50-default.rules
+ 
+diff --git a/src/polkitbackend/polkitbackendduktapeauthority.c b/src/polkitbackend/polkitbackendduktapeauthority.c
+new file mode 100644
+index 0000000..4b4f8fd
+--- /dev/null
++++ b/src/polkitbackend/polkitbackendduktapeauthority.c
+@@ -0,0 +1,1428 @@
++/*
++ * Copyright (C) 2008-2012 Red Hat, Inc.
++ * Copyright (C) 2015 Tangent Space <jstpierre@mecheye.net>
++ * Copyright (C) 2019 Wu Xiaotian <yetist@gmail.com>
++ *
++ * This library is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; either
++ * version 2 of the License, or (at your option) any later version.
++ *
++ * This library 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
++ * Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General
++ * Public License along with this library; if not, write to the
++ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
++ * Boston, MA 02111-1307, USA.
++ *
++ * Author: David Zeuthen <davidz@redhat.com>
++ */
++
++#include "config.h"
++#include <sys/wait.h>
++#include <errno.h>
++#include <pwd.h>
++#include <grp.h>
++#ifdef HAVE_NETGROUP_H
++#include <netgroup.h>
++#else
++#include <netdb.h>
++#endif
++#include <string.h>
++#include <glib/gstdio.h>
++#include <locale.h>
++#include <glib/gi18n-lib.h>
++
++#include <polkit/polkit.h>
++#include "polkitbackendjsauthority.h"
++
++#include <polkit/polkitprivate.h>
++
++#ifdef HAVE_LIBSYSTEMD
++#include <systemd/sd-login.h>
++#endif /* HAVE_LIBSYSTEMD */
++
++#include "initjs.h" /* init.js */
++#include "duktape.h"
++
++/**
++ * SECTION:polkitbackendjsauthority
++ * @title: PolkitBackendJsAuthority
++ * @short_description: JS Authority
++ * @stability: Unstable
++ *
++ * An implementation of #PolkitBackendAuthority that reads and
++ * evalates Javascript files and supports interaction with
++ * authentication agents (virtue of being based on
++ * #PolkitBackendInteractiveAuthority).
++ */
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++struct _PolkitBackendJsAuthorityPrivate
++{
++  gchar **rules_dirs;
++  GFileMonitor **dir_monitors; /* NULL-terminated array of GFileMonitor instances */
++  duk_context *cx;
++};
++
++
++static void utils_spawn (const gchar *const  *argv,
++                         guint                timeout_seconds,
++                         GCancellable        *cancellable,
++                         GAsyncReadyCallback  callback,
++                         gpointer             user_data);
++
++gboolean utils_spawn_finish (GAsyncResult   *res,
++                             gint           *out_exit_status,
++                             gchar         **out_standard_output,
++                             gchar         **out_standard_error,
++                             GError        **error);
++
++static void on_dir_monitor_changed (GFileMonitor     *monitor,
++                                    GFile            *file,
++                                    GFile            *other_file,
++                                    GFileMonitorEvent event_type,
++                                    gpointer          user_data);
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++enum
++{
++  PROP_0,
++  PROP_RULES_DIRS,
++};
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static GList *polkit_backend_js_authority_get_admin_auth_identities (PolkitBackendInteractiveAuthority *authority,
++                                                                     PolkitSubject                     *caller,
++                                                                     PolkitSubject                     *subject,
++                                                                     PolkitIdentity                    *user_for_subject,
++                                                                     gboolean                           subject_is_local,
++                                                                     gboolean                           subject_is_active,
++                                                                     const gchar                       *action_id,
++                                                                     PolkitDetails                     *details);
++
++static PolkitImplicitAuthorization polkit_backend_js_authority_check_authorization_sync (
++                                                          PolkitBackendInteractiveAuthority *authority,
++                                                          PolkitSubject                     *caller,
++                                                          PolkitSubject                     *subject,
++                                                          PolkitIdentity                    *user_for_subject,
++                                                          gboolean                           subject_is_local,
++                                                          gboolean                           subject_is_active,
++                                                          const gchar                       *action_id,
++                                                          PolkitDetails                     *details,
++                                                          PolkitImplicitAuthorization        implicit);
++
++G_DEFINE_TYPE (PolkitBackendJsAuthority, polkit_backend_js_authority, POLKIT_BACKEND_TYPE_INTERACTIVE_AUTHORITY);
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static duk_ret_t js_polkit_log (duk_context *cx);
++static duk_ret_t js_polkit_spawn (duk_context *cx);
++static duk_ret_t js_polkit_user_is_in_netgroup (duk_context *cx);
++
++static const duk_function_list_entry js_polkit_functions[] =
++{
++  { "log", js_polkit_log, 1 },
++  { "spawn", js_polkit_spawn, 1 },
++  { "_userIsInNetGroup", js_polkit_user_is_in_netgroup, 2 },
++  { NULL, NULL, 0 },
++};
++
++static void
++polkit_backend_js_authority_init (PolkitBackendJsAuthority *authority)
++{
++  authority->priv = G_TYPE_INSTANCE_GET_PRIVATE (authority,
++                                                 POLKIT_BACKEND_TYPE_JS_AUTHORITY,
++                                                 PolkitBackendJsAuthorityPrivate);
++}
++
++static gint
++rules_file_name_cmp (const gchar *a,
++                     const gchar *b)
++{
++  gint ret;
++  const gchar *a_base;
++  const gchar *b_base;
++
++  a_base = strrchr (a, '/');
++  b_base = strrchr (b, '/');
++
++  g_assert (a_base != NULL);
++  g_assert (b_base != NULL);
++  a_base += 1;
++  b_base += 1;
++
++  ret = g_strcmp0 (a_base, b_base);
++  if (ret == 0)
++    {
++      /* /etc wins over /usr */
++      ret = g_strcmp0 (a, b);
++      g_assert (ret != 0);
++    }
++
++  return ret;
++}
++
++static void
++load_scripts (PolkitBackendJsAuthority  *authority)
++{
++  duk_context *cx = authority->priv->cx;
++  GList *files = NULL;
++  GList *l;
++  guint num_scripts = 0;
++  GError *error = NULL;
++  guint n;
++
++  files = NULL;
++
++  for (n = 0; authority->priv->rules_dirs != NULL && authority->priv->rules_dirs[n] != NULL; n++)
++    {
++      const gchar *dir_name = authority->priv->rules_dirs[n];
++      GDir *dir = NULL;
++
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Loading rules from directory %s",
++                                    dir_name);
++
++      dir = g_dir_open (dir_name,
++                        0,
++                        &error);
++      if (dir == NULL)
++        {
++          polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                        "Error opening rules directory: %s (%s, %d)",
++                                        error->message, g_quark_to_string (error->domain), error->code);
++          g_clear_error (&error);
++        }
++      else
++        {
++          const gchar *name;
++          while ((name = g_dir_read_name (dir)) != NULL)
++            {
++              if (g_str_has_suffix (name, ".rules"))
++                files = g_list_prepend (files, g_strdup_printf ("%s/%s", dir_name, name));
++            }
++          g_dir_close (dir);
++        }
++    }
++
++  files = g_list_sort (files, (GCompareFunc) rules_file_name_cmp);
++
++  for (l = files; l != NULL; l = l->next)
++    {
++      const gchar *filename = (gchar *)l->data;
++#if (DUK_VERSION >= 20000)
++      GFile *file = g_file_new_for_path (filename);
++      char *contents;
++      gsize len;
++      if (!g_file_load_contents (file, NULL, &contents, &len, NULL, NULL))
++        {
++          polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                        "Error compiling script %s",
++                                        filename);
++          g_object_unref (file);
++          continue;
++        }
++
++      g_object_unref (file);
++      if (duk_peval_lstring_noresult(cx, contents,len) != 0)
++#else
++      if (duk_peval_file_noresult (cx, filename) != 0)
++#endif
++        {
++          polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                        "Error compiling script %s: %s",
++                                        filename, duk_safe_to_string (authority->priv->cx, -1));
++#if (DUK_VERSION >= 20000)
++          g_free (contents);
++#endif
++          continue;
++        }
++#if (DUK_VERSION >= 20000)
++      g_free (contents);
++#endif
++      num_scripts++;
++    }
++
++  polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                "Finished loading, compiling and executing %d rules",
++                                num_scripts);
++  g_list_free_full (files, g_free);
++}
++
++static void
++reload_scripts (PolkitBackendJsAuthority *authority)
++{
++  duk_context *cx = authority->priv->cx;
++
++  duk_set_top (cx, 0);
++  if (!duk_get_global_string (cx, "polkit")) {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error deleting old rules, not loading new ones");
++      return;
++  }
++  duk_push_string (cx, "_deleteRules");
++
++  duk_call_prop (cx, 0, 0);
++
++  polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                "Collecting garbage unconditionally...");
++
++  load_scripts (authority);
++
++  /* Let applications know we have new rules... */
++  g_signal_emit_by_name (authority, "changed");
++}
++
++static void
++on_dir_monitor_changed (GFileMonitor     *monitor,
++                        GFile            *file,
++                        GFile            *other_file,
++                        GFileMonitorEvent event_type,
++                        gpointer          user_data)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (user_data);
++
++  /* TODO: maybe rate-limit so storms of events are collapsed into one with a 500ms resolution?
++   *       Because when editing a file with emacs we get 4-8 events..
++   */
++
++  if (file != NULL)
++    {
++      gchar *name;
++
++      name = g_file_get_basename (file);
++
++      /* g_print ("event_type=%d file=%p name=%s\n", event_type, file, name); */
++      if (!g_str_has_prefix (name, ".") &&
++          !g_str_has_prefix (name, "#") &&
++          g_str_has_suffix (name, ".rules") &&
++          (event_type == G_FILE_MONITOR_EVENT_CREATED ||
++           event_type == G_FILE_MONITOR_EVENT_DELETED ||
++           event_type == G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT))
++        {
++          polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                        "Reloading rules");
++          reload_scripts (authority);
++        }
++      g_free (name);
++    }
++}
++
++
++static void
++setup_file_monitors (PolkitBackendJsAuthority *authority)
++{
++  guint n;
++  GPtrArray *p;
++
++  p = g_ptr_array_new ();
++  for (n = 0; authority->priv->rules_dirs != NULL && authority->priv->rules_dirs[n] != NULL; n++)
++    {
++      GFile *file;
++      GError *error;
++      GFileMonitor *monitor;
++
++      file = g_file_new_for_path (authority->priv->rules_dirs[n]);
++      error = NULL;
++      monitor = g_file_monitor_directory (file,
++                                          G_FILE_MONITOR_NONE,
++                                          NULL,
++                                          &error);
++      g_object_unref (file);
++      if (monitor == NULL)
++        {
++          g_warning ("Error monitoring directory %s: %s",
++                     authority->priv->rules_dirs[n],
++                     error->message);
++          g_clear_error (&error);
++        }
++      else
++        {
++          g_signal_connect (monitor,
++                            "changed",
++                            G_CALLBACK (on_dir_monitor_changed),
++                            authority);
++          g_ptr_array_add (p, monitor);
++        }
++    }
++  g_ptr_array_add (p, NULL);
++  authority->priv->dir_monitors = (GFileMonitor**) g_ptr_array_free (p, FALSE);
++}
++
++static void
++polkit_backend_js_authority_constructed (GObject *object)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (object);
++  duk_context *cx;
++
++  cx = duk_create_heap (NULL, NULL, NULL, authority, NULL);
++  if (cx == NULL)
++    goto fail;
++
++  authority->priv->cx = cx;
++
++  duk_push_global_object (cx);
++  duk_push_object (cx);
++  duk_put_function_list (cx, -1, js_polkit_functions);
++  duk_put_prop_string (cx, -2, "polkit");
++
++  duk_eval_string (cx, init_js);
++
++  if (authority->priv->rules_dirs == NULL)
++    {
++      authority->priv->rules_dirs = g_new0 (gchar *, 3);
++      authority->priv->rules_dirs[0] = g_strdup (PACKAGE_SYSCONF_DIR "/polkit-1/rules.d");
++      authority->priv->rules_dirs[1] = g_strdup (PACKAGE_DATA_DIR "/polkit-1/rules.d");
++    }
++
++  setup_file_monitors (authority);
++  load_scripts (authority);
++
++  G_OBJECT_CLASS (polkit_backend_js_authority_parent_class)->constructed (object);
++  return;
++
++ fail:
++  g_critical ("Error initializing JavaScript environment");
++  g_assert_not_reached ();
++}
++
++static void
++polkit_backend_js_authority_finalize (GObject *object)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (object);
++  guint n;
++
++  for (n = 0; authority->priv->dir_monitors != NULL && authority->priv->dir_monitors[n] != NULL; n++)
++    {
++      GFileMonitor *monitor = authority->priv->dir_monitors[n];
++      g_signal_handlers_disconnect_by_func (monitor,
++                                            G_CALLBACK (on_dir_monitor_changed),
++                                            authority);
++      g_object_unref (monitor);
++    }
++  g_free (authority->priv->dir_monitors);
++  g_strfreev (authority->priv->rules_dirs);
++
++  duk_destroy_heap (authority->priv->cx);
++
++  G_OBJECT_CLASS (polkit_backend_js_authority_parent_class)->finalize (object);
++}
++
++static void
++polkit_backend_js_authority_set_property (GObject      *object,
++                                          guint         property_id,
++                                          const GValue *value,
++                                          GParamSpec   *pspec)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (object);
++
++  switch (property_id)
++    {
++      case PROP_RULES_DIRS:
++        g_assert (authority->priv->rules_dirs == NULL);
++        authority->priv->rules_dirs = (gchar **) g_value_dup_boxed (value);
++        break;
++
++      default:
++        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
++        break;
++    }
++}
++
++static const gchar *
++polkit_backend_js_authority_get_name (PolkitBackendAuthority *authority)
++{
++  return "js";
++}
++
++static const gchar *
++polkit_backend_js_authority_get_version (PolkitBackendAuthority *authority)
++{
++  return PACKAGE_VERSION;
++}
++
++static PolkitAuthorityFeatures
++polkit_backend_js_authority_get_features (PolkitBackendAuthority *authority)
++{
++  return POLKIT_AUTHORITY_FEATURES_TEMPORARY_AUTHORIZATION;
++}
++
++static void
++polkit_backend_js_authority_class_init (PolkitBackendJsAuthorityClass *klass)
++{
++  GObjectClass *gobject_class;
++  PolkitBackendAuthorityClass *authority_class;
++  PolkitBackendInteractiveAuthorityClass *interactive_authority_class;
++
++
++  gobject_class = G_OBJECT_CLASS (klass);
++  gobject_class->finalize                               = polkit_backend_js_authority_finalize;
++  gobject_class->set_property                           = polkit_backend_js_authority_set_property;
++  gobject_class->constructed                            = polkit_backend_js_authority_constructed;
++
++  authority_class = POLKIT_BACKEND_AUTHORITY_CLASS (klass);
++  authority_class->get_name                             = polkit_backend_js_authority_get_name;
++  authority_class->get_version                          = polkit_backend_js_authority_get_version;
++  authority_class->get_features                         = polkit_backend_js_authority_get_features;
++
++  interactive_authority_class = POLKIT_BACKEND_INTERACTIVE_AUTHORITY_CLASS (klass);
++  interactive_authority_class->get_admin_identities     = polkit_backend_js_authority_get_admin_auth_identities;
++  interactive_authority_class->check_authorization_sync = polkit_backend_js_authority_check_authorization_sync;
++
++  g_object_class_install_property (gobject_class,
++                                   PROP_RULES_DIRS,
++                                   g_param_spec_boxed ("rules-dirs",
++                                                       NULL,
++                                                       NULL,
++                                                       G_TYPE_STRV,
++                                                       G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
++
++
++  g_type_class_add_private (klass, sizeof (PolkitBackendJsAuthorityPrivate));
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static void
++set_property_str (duk_context *cx,
++                  const gchar *name,
++                  const gchar *value)
++{
++  duk_push_string (cx, value);
++  duk_put_prop_string (cx, -2, name);
++}
++
++static void
++set_property_strv (duk_context *cx,
++                   const gchar *name,
++                   GPtrArray   *value)
++{
++  guint n;
++  duk_push_array (cx);
++  for (n = 0; n < value->len; n++)
++    {
++      duk_push_string (cx, g_ptr_array_index (value, n));
++      duk_put_prop_index (cx, -2, n);
++    }
++  duk_put_prop_string (cx, -2, name);
++}
++
++static void
++set_property_int32 (duk_context *cx,
++                    const gchar *name,
++                    gint32       value)
++{
++  duk_push_int (cx, value);
++  duk_put_prop_string (cx, -2, name);
++}
++
++static void
++set_property_bool (duk_context *cx,
++                   const char  *name,
++                   gboolean     value)
++{
++  duk_push_boolean (cx, value);
++  duk_put_prop_string (cx, -2, name);
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static gboolean
++push_subject (duk_context               *cx,
++              PolkitSubject             *subject,
++              PolkitIdentity            *user_for_subject,
++              gboolean                   subject_is_local,
++              gboolean                   subject_is_active,
++              GError                   **error)
++{
++  gboolean ret = FALSE;
++  pid_t pid;
++  uid_t uid;
++  gchar *user_name = NULL;
++  GPtrArray *groups = NULL;
++  struct passwd *passwd;
++  char *seat_str = NULL;
++  char *session_str = NULL;
++
++  if (!duk_get_global_string (cx, "Subject")) {
++    return FALSE;
++  }
++
++  duk_new (cx, 0);
++
++  if (POLKIT_IS_UNIX_PROCESS (subject))
++    {
++      pid = polkit_unix_process_get_pid (POLKIT_UNIX_PROCESS (subject));
++    }
++  else if (POLKIT_IS_SYSTEM_BUS_NAME (subject))
++    {
++      PolkitSubject *process;
++      process = polkit_system_bus_name_get_process_sync (POLKIT_SYSTEM_BUS_NAME (subject), NULL, error);
++      if (process == NULL)
++        goto out;
++      pid = polkit_unix_process_get_pid (POLKIT_UNIX_PROCESS (process));
++      g_object_unref (process);
++    }
++  else
++    {
++      g_assert_not_reached ();
++    }
++
++#ifdef HAVE_LIBSYSTEMD
++  if (sd_pid_get_session (pid, &session_str) == 0)
++    {
++      if (sd_session_get_seat (session_str, &seat_str) == 0)
++        {
++          /* do nothing */
++        }
++    }
++#endif /* HAVE_LIBSYSTEMD */
++
++  g_assert (POLKIT_IS_UNIX_USER (user_for_subject));
++  uid = polkit_unix_user_get_uid (POLKIT_UNIX_USER (user_for_subject));
++
++  groups = g_ptr_array_new_with_free_func (g_free);
++
++  passwd = getpwuid (uid);
++  if (passwd == NULL)
++    {
++      user_name = g_strdup_printf ("%d", (gint) uid);
++      g_warning ("Error looking up info for uid %d: %m", (gint) uid);
++    }
++  else
++    {
++      gid_t gids[512];
++      int num_gids = 512;
++
++      user_name = g_strdup (passwd->pw_name);
++
++      if (getgrouplist (passwd->pw_name,
++                        passwd->pw_gid,
++                        gids,
++                        &num_gids) < 0)
++        {
++          g_warning ("Error looking up groups for uid %d: %m", (gint) uid);
++        }
++      else
++        {
++          gint n;
++          for (n = 0; n < num_gids; n++)
++            {
++              struct group *group;
++              group = getgrgid (gids[n]);
++              if (group == NULL)
++                {
++                  g_ptr_array_add (groups, g_strdup_printf ("%d", (gint) gids[n]));
++                }
++              else
++                {
++                  g_ptr_array_add (groups, g_strdup (group->gr_name));
++                }
++            }
++        }
++    }
++
++  set_property_int32 (cx, "pid", pid);
++  set_property_str (cx, "user", user_name);
++  set_property_strv (cx, "groups", groups);
++  set_property_str (cx, "seat", seat_str);
++  set_property_str (cx, "session", session_str);
++  set_property_bool (cx, "local", subject_is_local);
++  set_property_bool (cx, "active", subject_is_active);
++
++  ret = TRUE;
++
++ out:
++  free (session_str);
++  free (seat_str);
++  g_free (user_name);
++  if (groups != NULL)
++    g_ptr_array_unref (groups);
++
++  return ret;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static gboolean
++push_action_and_details (duk_context               *cx,
++                         const gchar               *action_id,
++                         PolkitDetails             *details,
++                         GError                   **error)
++{
++  gchar **keys;
++  guint n;
++
++  if (!duk_get_global_string (cx, "Action")) {
++    return FALSE;
++  }
++
++  duk_new (cx, 0);
++
++  set_property_str (cx, "id", action_id);
++
++  keys = polkit_details_get_keys (details);
++  for (n = 0; keys != NULL && keys[n] != NULL; n++)
++    {
++      gchar *key;
++      const gchar *value;
++      key = g_strdup_printf ("_detail_%s", keys[n]);
++      value = polkit_details_lookup (details, keys[n]);
++      set_property_str (cx, key, value);
++      g_free (key);
++    }
++  g_strfreev (keys);
++
++  return TRUE;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static GList *
++polkit_backend_js_authority_get_admin_auth_identities (PolkitBackendInteractiveAuthority *_authority,
++                                                       PolkitSubject                     *caller,
++                                                       PolkitSubject                     *subject,
++                                                       PolkitIdentity                    *user_for_subject,
++                                                       gboolean                           subject_is_local,
++                                                       gboolean                           subject_is_active,
++                                                       const gchar                       *action_id,
++                                                       PolkitDetails                     *details)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (_authority);
++  GList *ret = NULL;
++  guint n;
++  GError *error = NULL;
++  const char *ret_str = NULL;
++  gchar **ret_strs = NULL;
++  duk_context *cx = authority->priv->cx;
++
++  duk_set_top (cx, 0);
++  if (!duk_get_global_string (cx, "polkit")) {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error deleting old rules, not loading new ones");
++      goto out;
++  }
++
++  duk_push_string (cx, "_runAdminRules");
++
++  if (!push_action_and_details (cx, action_id, details, &error))
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error converting action and details to JS object: %s",
++                                    error->message);
++      g_clear_error (&error);
++      goto out;
++    }
++
++  if (!push_subject (cx, subject, user_for_subject, subject_is_local, subject_is_active, &error))
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error converting subject to JS object: %s",
++                                    error->message);
++      g_clear_error (&error);
++      goto out;
++    }
++
++  if (duk_pcall_prop (cx, 0, 2) != DUK_ERR_NONE)
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error evaluating admin rules: ",
++                                    duk_safe_to_string (cx, -1));
++      goto out;
++    }
++
++  ret_str = duk_require_string (cx, -1);
++
++  ret_strs = g_strsplit (ret_str, ",", -1);
++  for (n = 0; ret_strs != NULL && ret_strs[n] != NULL; n++)
++    {
++      const gchar *identity_str = ret_strs[n];
++      PolkitIdentity *identity;
++
++      error = NULL;
++      identity = polkit_identity_from_string (identity_str, &error);
++      if (identity == NULL)
++        {
++          polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                        "Identity `%s' is not valid, ignoring: %s",
++                                        identity_str, error->message);
++          g_clear_error (&error);
++        }
++      else
++        {
++          ret = g_list_prepend (ret, identity);
++        }
++    }
++  ret = g_list_reverse (ret);
++
++ out:
++  g_strfreev (ret_strs);
++  /* fallback to root password auth */
++  if (ret == NULL)
++    ret = g_list_prepend (ret, polkit_unix_user_new (0));
++
++  return ret;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static PolkitImplicitAuthorization
++polkit_backend_js_authority_check_authorization_sync (PolkitBackendInteractiveAuthority *_authority,
++                                                      PolkitSubject                     *caller,
++                                                      PolkitSubject                     *subject,
++                                                      PolkitIdentity                    *user_for_subject,
++                                                      gboolean                           subject_is_local,
++                                                      gboolean                           subject_is_active,
++                                                      const gchar                       *action_id,
++                                                      PolkitDetails                     *details,
++                                                      PolkitImplicitAuthorization        implicit)
++{
++  PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (_authority);
++  PolkitImplicitAuthorization ret = implicit;
++  GError *error = NULL;
++  gchar *ret_str = NULL;
++  gboolean good = FALSE;
++  duk_context *cx = authority->priv->cx;
++
++  duk_set_top (cx, 0);
++  if (!duk_get_global_string (cx, "polkit")) {
++      goto out;
++  }
++
++  duk_push_string (cx, "_runRules");
++
++  if (!push_action_and_details (cx, action_id, details, &error))
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error converting action and details to JS object: %s",
++                                    error->message);
++      g_clear_error (&error);
++      goto out;
++    }
++
++  if (!push_subject (cx, subject, user_for_subject, subject_is_local, subject_is_active, &error))
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error converting subject to JS object: %s",
++                                    error->message);
++      g_clear_error (&error);
++      goto out;
++    }
++
++  if (duk_pcall_prop (cx, 0, 2) != DUK_ERR_NONE)
++  {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Error evaluating authorization rules: ",
++                                    duk_safe_to_string (cx, -1));
++      goto out;
++  }
++
++  if (duk_is_null(cx, -1)) {
++    good = TRUE;
++    goto out;
++  }
++  ret_str = g_strdup (duk_require_string (cx, -1));
++  if (!polkit_implicit_authorization_from_string (ret_str, &ret))
++    {
++      polkit_backend_authority_log (POLKIT_BACKEND_AUTHORITY (authority),
++                                    "Returned result `%s' is not valid",
++                                    ret_str);
++      goto out;
++    }
++
++  good = TRUE;
++
++ out:
++  if (!good)
++    ret = POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED;
++  if (ret_str != NULL)
++      g_free (ret_str);
++
++  return ret;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static duk_ret_t
++js_polkit_log (duk_context *cx)
++{
++  const char *str = duk_require_string (cx, 0);
++  fprintf (stderr, "%s\n", str);
++  return 0;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++static const gchar *
++get_signal_name (gint signal_number)
++{
++  switch (signal_number)
++    {
++#define _HANDLE_SIG(sig) case sig: return #sig;
++    _HANDLE_SIG (SIGHUP);
++    _HANDLE_SIG (SIGINT);
++    _HANDLE_SIG (SIGQUIT);
++    _HANDLE_SIG (SIGILL);
++    _HANDLE_SIG (SIGABRT);
++    _HANDLE_SIG (SIGFPE);
++    _HANDLE_SIG (SIGKILL);
++    _HANDLE_SIG (SIGSEGV);
++    _HANDLE_SIG (SIGPIPE);
++    _HANDLE_SIG (SIGALRM);
++    _HANDLE_SIG (SIGTERM);
++    _HANDLE_SIG (SIGUSR1);
++    _HANDLE_SIG (SIGUSR2);
++    _HANDLE_SIG (SIGCHLD);
++    _HANDLE_SIG (SIGCONT);
++    _HANDLE_SIG (SIGSTOP);
++    _HANDLE_SIG (SIGTSTP);
++    _HANDLE_SIG (SIGTTIN);
++    _HANDLE_SIG (SIGTTOU);
++    _HANDLE_SIG (SIGBUS);
++#ifdef SIGPOLL
++    _HANDLE_SIG (SIGPOLL);
++#endif
++    _HANDLE_SIG (SIGPROF);
++    _HANDLE_SIG (SIGSYS);
++    _HANDLE_SIG (SIGTRAP);
++    _HANDLE_SIG (SIGURG);
++    _HANDLE_SIG (SIGVTALRM);
++    _HANDLE_SIG (SIGXCPU);
++    _HANDLE_SIG (SIGXFSZ);
++#undef _HANDLE_SIG
++    default:
++      break;
++    }
++  return "UNKNOWN_SIGNAL";
++}
++
++typedef struct
++{
++  GMainLoop *loop;
++  GAsyncResult *res;
++} SpawnData;
++
++static void
++spawn_cb (GObject       *source_object,
++          GAsyncResult  *res,
++          gpointer       user_data)
++{
++  SpawnData *data = (SpawnData *)user_data;
++  data->res = (GAsyncResult*)g_object_ref (res);
++  g_main_loop_quit (data->loop);
++}
++
++static duk_ret_t
++js_polkit_spawn (duk_context *cx)
++{
++#if (DUK_VERSION >= 20000)
++  duk_ret_t ret = DUK_RET_ERROR;
++#else
++  duk_ret_t ret = DUK_RET_INTERNAL_ERROR;
++#endif
++  gchar *standard_output = NULL;
++  gchar *standard_error = NULL;
++  gint exit_status;
++  GError *error = NULL;
++  guint32 array_len;
++  gchar **argv = NULL;
++  GMainContext *context = NULL;
++  GMainLoop *loop = NULL;
++  SpawnData data = {0};
++  char *err_str = NULL;
++  guint n;
++
++  if (!duk_is_array (cx, 0))
++    goto out;
++
++  array_len = duk_get_length (cx, 0);
++
++  argv = g_new0 (gchar*, array_len + 1);
++  for (n = 0; n < array_len; n++)
++    {
++      duk_get_prop_index (cx, 0, n);
++      argv[n] = g_strdup (duk_to_string (cx, -1));
++      duk_pop (cx);
++    }
++
++  context = g_main_context_new ();
++  loop = g_main_loop_new (context, FALSE);
++
++  g_main_context_push_thread_default (context);
++
++  data.loop = loop;
++  utils_spawn ((const gchar *const *) argv,
++               10, /* timeout_seconds */
++               NULL, /* cancellable */
++               spawn_cb,
++               &data);
++
++  g_main_loop_run (loop);
++
++  g_main_context_pop_thread_default (context);
++
++  if (!utils_spawn_finish (data.res,
++                           &exit_status,
++                           &standard_output,
++                           &standard_error,
++                           &error))
++    {
++      err_str = g_strdup_printf ("Error spawning helper: %s (%s, %d)",
++                                 error->message, g_quark_to_string (error->domain), error->code);
++      g_clear_error (&error);
++      goto out;
++    }
++
++  if (!(WIFEXITED (exit_status) && WEXITSTATUS (exit_status) == 0))
++    {
++      GString *gstr;
++      gstr = g_string_new (NULL);
++      if (WIFEXITED (exit_status))
++        {
++          g_string_append_printf (gstr,
++                                  "Helper exited with non-zero exit status %d",
++                                  WEXITSTATUS (exit_status));
++        }
++      else if (WIFSIGNALED (exit_status))
++        {
++          g_string_append_printf (gstr,
++                                  "Helper was signaled with signal %s (%d)",
++                                  get_signal_name (WTERMSIG (exit_status)),
++                                  WTERMSIG (exit_status));
++        }
++      g_string_append_printf (gstr, ", stdout=`%s', stderr=`%s'",
++                              standard_output, standard_error);
++      err_str = g_string_free (gstr, FALSE);
++      goto out;
++    }
++
++  duk_push_string (cx, standard_output);
++  ret = 1;
++
++ out:
++  g_strfreev (argv);
++  g_free (standard_output);
++  g_free (standard_error);
++  g_clear_object (&data.res);
++  if (loop != NULL)
++    g_main_loop_unref (loop);
++  if (context != NULL)
++    g_main_context_unref (context);
++
++  if (err_str)
++    duk_error (cx, DUK_ERR_ERROR, err_str);
++
++  return ret;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++
++static duk_ret_t
++js_polkit_user_is_in_netgroup (duk_context *cx)
++{
++  const char *user;
++  const char *netgroup;
++  gboolean is_in_netgroup = FALSE;
++
++  user = duk_require_string (cx, 0);
++  netgroup = duk_require_string (cx, 1);
++
++  if (innetgr (netgroup,
++               NULL,  /* host */
++               user,
++               NULL)) /* domain */
++    {
++      is_in_netgroup = TRUE;
++    }
++
++  duk_push_boolean (cx, is_in_netgroup);
++  return 1;
++}
++
++/* ---------------------------------------------------------------------------------------------------- */
++
++typedef struct
++{
++  GSimpleAsyncResult *simple; /* borrowed reference */
++  GMainContext *main_context; /* may be NULL */
++
++  GCancellable *cancellable;  /* may be NULL */
++  gulong cancellable_handler_id;
++
++  GPid child_pid;
++  gint child_stdout_fd;
++  gint child_stderr_fd;
++
++  GIOChannel *child_stdout_channel;
++  GIOChannel *child_stderr_channel;
++
++  GSource *child_watch_source;
++  GSource *child_stdout_source;
++  GSource *child_stderr_source;
++
++  guint timeout_seconds;
++  gboolean timed_out;
++  GSource *timeout_source;
++
++  GString *child_stdout;
++  GString *child_stderr;
++
++  gint exit_status;
++} UtilsSpawnData;
++
++static void
++utils_child_watch_from_release_cb (GPid     pid,
++                                   gint     status,
++                                   gpointer user_data)
++{
++}
++
++static void
++utils_spawn_data_free (UtilsSpawnData *data)
++{
++  if (data->timeout_source != NULL)
++    {
++      g_source_destroy (data->timeout_source);
++      data->timeout_source = NULL;
++    }
++
++  /* Nuke the child, if necessary */
++  if (data->child_watch_source != NULL)
++    {
++      g_source_destroy (data->child_watch_source);
++      data->child_watch_source = NULL;
++    }
++
++  if (data->child_pid != 0)
++    {
++      GSource *source;
++      kill (data->child_pid, SIGTERM);
++      /* OK, we need to reap for the child ourselves - we don't want
++       * to use waitpid() because that might block the calling
++       * thread (the child might handle SIGTERM and use several
++       * seconds for cleanup/rollback).
++       *
++       * So we use GChildWatch instead.
++       *
++       * Avoid taking a references to ourselves. but note that we need
++       * to pass the GSource so we can nuke it once handled.
++       */
++      source = g_child_watch_source_new (data->child_pid);
++      g_source_set_callback (source,
++                             (GSourceFunc) utils_child_watch_from_release_cb,
++                             source,
++                             (GDestroyNotify) g_source_destroy);
++      g_source_attach (source, data->main_context);
++      g_source_unref (source);
++      data->child_pid = 0;
++    }
++
++  if (data->child_stdout != NULL)
++    {
++      g_string_free (data->child_stdout, TRUE);
++      data->child_stdout = NULL;
++    }
++
++  if (data->child_stderr != NULL)
++    {
++      g_string_free (data->child_stderr, TRUE);
++      data->child_stderr = NULL;
++    }
++
++  if (data->child_stdout_channel != NULL)
++    {
++      g_io_channel_unref (data->child_stdout_channel);
++      data->child_stdout_channel = NULL;
++    }
++  if (data->child_stderr_channel != NULL)
++    {
++      g_io_channel_unref (data->child_stderr_channel);
++      data->child_stderr_channel = NULL;
++    }
++
++  if (data->child_stdout_source != NULL)
++    {
++      g_source_destroy (data->child_stdout_source);
++      data->child_stdout_source = NULL;
++    }
++  if (data->child_stderr_source != NULL)
++    {
++      g_source_destroy (data->child_stderr_source);
++      data->child_stderr_source = NULL;
++    }
++
++  if (data->child_stdout_fd != -1)
++    {
++      g_warn_if_fail (close (data->child_stdout_fd) == 0);
++      data->child_stdout_fd = -1;
++    }
++  if (data->child_stderr_fd != -1)
++    {
++      g_warn_if_fail (close (data->child_stderr_fd) == 0);
++      data->child_stderr_fd = -1;
++    }
++
++  if (data->cancellable_handler_id > 0)
++    {
++      g_cancellable_disconnect (data->cancellable, data->cancellable_handler_id);
++      data->cancellable_handler_id = 0;
++    }
++
++  if (data->main_context != NULL)
++    g_main_context_unref (data->main_context);
++
++  if (data->cancellable != NULL)
++    g_object_unref (data->cancellable);
++
++  g_slice_free (UtilsSpawnData, data);
++}
++
++/* called in the thread where @cancellable was cancelled */
++static void
++utils_on_cancelled (GCancellable *cancellable,
++                    gpointer      user_data)
++{
++  UtilsSpawnData *data = (UtilsSpawnData *)user_data;
++  GError *error;
++
++  error = NULL;
++  g_warn_if_fail (g_cancellable_set_error_if_cancelled (cancellable, &error));
++  g_simple_async_result_take_error (data->simple, error);
++  g_simple_async_result_complete_in_idle (data->simple);
++  g_object_unref (data->simple);
++}
++
++static gboolean
++utils_read_child_stderr (GIOChannel *channel,
++                         GIOCondition condition,
++                         gpointer user_data)
++{
++  UtilsSpawnData *data = (UtilsSpawnData *)user_data;
++  gchar buf[1024];
++  gsize bytes_read;
++
++  g_io_channel_read_chars (channel, buf, sizeof buf, &bytes_read, NULL);
++  g_string_append_len (data->child_stderr, buf, bytes_read);
++  return TRUE;
++}
++
++static gboolean
++utils_read_child_stdout (GIOChannel *channel,
++                         GIOCondition condition,
++                         gpointer user_data)
++{
++  UtilsSpawnData *data = (UtilsSpawnData *)user_data;
++  gchar buf[1024];
++  gsize bytes_read;
++
++  g_io_channel_read_chars (channel, buf, sizeof buf, &bytes_read, NULL);
++  g_string_append_len (data->child_stdout, buf, bytes_read);
++  return TRUE;
++}
++
++static void
++utils_child_watch_cb (GPid     pid,
++                      gint     status,
++                      gpointer user_data)
++{
++  UtilsSpawnData *data = (UtilsSpawnData *)user_data;
++  gchar *buf;
++  gsize buf_size;
++
++  if (g_io_channel_read_to_end (data->child_stdout_channel, &buf, &buf_size, NULL) == G_IO_STATUS_NORMAL)
++    {
++      g_string_append_len (data->child_stdout, buf, buf_size);
++      g_free (buf);
++    }
++  if (g_io_channel_read_to_end (data->child_stderr_channel, &buf, &buf_size, NULL) == G_IO_STATUS_NORMAL)
++    {
++      g_string_append_len (data->child_stderr, buf, buf_size);
++      g_free (buf);
++    }
++
++  data->exit_status = status;
++
++  /* ok, child watch is history, make sure we don't free it in spawn_data_free() */
++  data->child_pid = 0;
++  data->child_watch_source = NULL;
++
++  /* we're done */
++  g_simple_async_result_complete_in_idle (data->simple);
++  g_object_unref (data->simple);
++}
++
++static gboolean
++utils_timeout_cb (gpointer user_data)
++{
++  UtilsSpawnData *data = (UtilsSpawnData *)user_data;
++
++  data->timed_out = TRUE;
++
++  /* ok, timeout is history, make sure we don't free it in spawn_data_free() */
++  data->timeout_source = NULL;
++
++  /* we're done */
++  g_simple_async_result_complete_in_idle (data->simple);
++  g_object_unref (data->simple);
++
++  return FALSE; /* remove source */
++}
++
++static void
++utils_spawn (const gchar *const  *argv,
++             guint                timeout_seconds,
++             GCancellable        *cancellable,
++             GAsyncReadyCallback  callback,
++             gpointer             user_data)
++{
++  UtilsSpawnData *data;
++  GError *error;
++
++  data = g_slice_new0 (UtilsSpawnData);
++  data->timeout_seconds = timeout_seconds;
++  data->simple = g_simple_async_result_new (NULL,
++                                            callback,
++                                            user_data,
++                                            (gpointer*)utils_spawn);
++  data->main_context = g_main_context_get_thread_default ();
++  if (data->main_context != NULL)
++    g_main_context_ref (data->main_context);
++
++  data->cancellable = cancellable != NULL ? (GCancellable*)g_object_ref (cancellable) : NULL;
++
++  data->child_stdout = g_string_new (NULL);
++  data->child_stderr = g_string_new (NULL);
++  data->child_stdout_fd = -1;
++  data->child_stderr_fd = -1;
++
++  /* the life-cycle of UtilsSpawnData is tied to its GSimpleAsyncResult */
++  g_simple_async_result_set_op_res_gpointer (data->simple, data, (GDestroyNotify) utils_spawn_data_free);
++
++  error = NULL;
++  if (data->cancellable != NULL)
++    {
++      /* could already be cancelled */
++      error = NULL;
++      if (g_cancellable_set_error_if_cancelled (data->cancellable, &error))
++        {
++          g_simple_async_result_take_error (data->simple, error);
++          g_simple_async_result_complete_in_idle (data->simple);
++          g_object_unref (data->simple);
++          goto out;
++        }
++
++      data->cancellable_handler_id = g_cancellable_connect (data->cancellable,
++                                                            G_CALLBACK (utils_on_cancelled),
++                                                            data,
++                                                            NULL);
++    }
++
++  error = NULL;
++  if (!g_spawn_async_with_pipes (NULL, /* working directory */
++                                 (gchar **) argv,
++                                 NULL, /* envp */
++                                 G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
++                                 NULL, /* child_setup */
++                                 NULL, /* child_setup's user_data */
++                                 &(data->child_pid),
++                                 NULL, /* gint *stdin_fd */
++                                 &(data->child_stdout_fd),
++                                 &(data->child_stderr_fd),
++                                 &error))
++    {
++      g_prefix_error (&error, "Error spawning: ");
++      g_simple_async_result_take_error (data->simple, error);
++      g_simple_async_result_complete_in_idle (data->simple);
++      g_object_unref (data->simple);
++      goto out;
++    }
++
++  if (timeout_seconds > 0)
++    {
++      data->timeout_source = g_timeout_source_new_seconds (timeout_seconds);
++      g_source_set_priority (data->timeout_source, G_PRIORITY_DEFAULT);
++      g_source_set_callback (data->timeout_source, utils_timeout_cb, data, NULL);
++      g_source_attach (data->timeout_source, data->main_context);
++      g_source_unref (data->timeout_source);
++    }
++
++  data->child_watch_source = g_child_watch_source_new (data->child_pid);
++  g_source_set_callback (data->child_watch_source, (GSourceFunc) utils_child_watch_cb, data, NULL);
++  g_source_attach (data->child_watch_source, data->main_context);
++  g_source_unref (data->child_watch_source);
++
++  data->child_stdout_channel = g_io_channel_unix_new (data->child_stdout_fd);
++  g_io_channel_set_flags (data->child_stdout_channel, G_IO_FLAG_NONBLOCK, NULL);
++  data->child_stdout_source = g_io_create_watch (data->child_stdout_channel, G_IO_IN);
++  g_source_set_callback (data->child_stdout_source, (GSourceFunc) utils_read_child_stdout, data, NULL);
++  g_source_attach (data->child_stdout_source, data->main_context);
++  g_source_unref (data->child_stdout_source);
++
++  data->child_stderr_channel = g_io_channel_unix_new (data->child_stderr_fd);
++  g_io_channel_set_flags (data->child_stderr_channel, G_IO_FLAG_NONBLOCK, NULL);
++  data->child_stderr_source = g_io_create_watch (data->child_stderr_channel, G_IO_IN);
++  g_source_set_callback (data->child_stderr_source, (GSourceFunc) utils_read_child_stderr, data, NULL);
++  g_source_attach (data->child_stderr_source, data->main_context);
++  g_source_unref (data->child_stderr_source);
++
++ out:
++  ;
++}
++
++gboolean
++utils_spawn_finish (GAsyncResult   *res,
++                    gint           *out_exit_status,
++                    gchar         **out_standard_output,
++                    gchar         **out_standard_error,
++                    GError        **error)
++{
++  GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
++  UtilsSpawnData *data;
++  gboolean ret = FALSE;
++
++  g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
++  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
++
++  g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == utils_spawn);
++
++  if (g_simple_async_result_propagate_error (simple, error))
++    goto out;
++
++  data = (UtilsSpawnData*)g_simple_async_result_get_op_res_gpointer (simple);
++
++  if (data->timed_out)
++    {
++      g_set_error (error,
++                   G_IO_ERROR,
++                   G_IO_ERROR_TIMED_OUT,
++                   "Timed out after %d seconds",
++                   data->timeout_seconds);
++      goto out;
++    }
++
++  if (out_exit_status != NULL)
++    *out_exit_status = data->exit_status;
++
++  if (out_standard_output != NULL)
++    *out_standard_output = g_strdup (data->child_stdout->str);
++
++  if (out_standard_error != NULL)
++    *out_standard_error = g_strdup (data->child_stderr->str);
++
++  ret = TRUE;
++
++ out:
++  return ret;
++}
+-- 
+2.29.2
+
diff --git a/extra/polkit-duktape/PKGBUILD b/extra/polkit-duktape/PKGBUILD
new file mode 100644
index 00000000..d2898e2a
--- /dev/null
+++ b/extra/polkit-duktape/PKGBUILD
@@ -0,0 +1,65 @@
+# Maintainer: Jan de Groot <jgc@archlinux.org>
+
+_pkgname=polkit
+pkgname=${_pkgname}-duktape
+pkgver=0.118
+pkgrel=3
+pkgdesc="polkit with duktape as the javascript engine"
+arch=(x86_64)
+license=(LGPL)
+url="https://www.freedesktop.org/wiki/Software/polkit/"
+depends=(glib2 pam expat systemd duktape)
+makedepends=(intltool gtk-doc gobject-introspection git autoconf-archive)
+conflicts=(polkit)
+provides=(polkit)
+backup=(etc/pam.d/polkit-1)
+_commit=ff4c2144f0fb1325275887d9e254117fcd8a1b52
+source=("git+https://gitlab.freedesktop.org/polkit/polkit.git#commit=$_commit"
+        "0001-Add-duktape-as-javascript-engine.patch")
+sha256sums=('SKIP'
+            '4b6b90ca0f2fa44115027cc6bb98fa43fede46e7fa31a6fd52f8ec142c0073f1')
+
+pkgver() {
+  cd $_pkgname
+  git describe --tags | sed 's/-/+/g'
+}
+
+prepare() {
+  cd $_pkgname
+  patch -p1 -i ../0001-Add-duktape-as-javascript-engine.patch
+  NOCONFIGURE=1 ./autogen.sh
+}
+
+build() {
+  cd $_pkgname
+
+  ./configure --prefix=/usr --sysconfdir=/etc \
+      --localstatedir=/var --libexecdir=/usr/lib \
+      --enable-libsystemd-login=yes --disable-static \
+      --enable-gtk-doc --with-os-type=redhat --with-duktape
+
+  sed -i -e 's/ -shared / -Wl,-O1,--as-needed\0/g' libtool
+
+  make
+}
+
+check() {
+  cd $_pkgname
+  make -k check || :
+}
+
+package() {
+  cd $_pkgname
+  make DESTDIR="$pkgdir" install \
+      dbusconfdir=/usr/share/dbus-1/system.d \
+      rulesdir=/usr/share/polkit-1/rules.d
+
+  install -d -o root -g 102 -m 750 "$pkgdir"/{etc,usr/share}/polkit-1/rules.d
+
+  install -Dm644 /dev/stdin "$pkgdir/usr/lib/sysusers.d/$pkgname.conf" <<END
+u polkitd 102 "PolicyKit daemon"
+m polkitd proc
+END
+}
+
+# vim: ts=2 sw=2 et: