[gnome-session/wip/desktop-generator: 2/2] wip! generate service files from desktop files

[Ray Strode <halfline src gnome org>]

commit 680cd621c0b526c2ceab760a7cf52831bb518b6f
Author: Ray Strode <rstrode redhat com>
Date:   Fri Nov 6 13:06:58 2015 -0500

    wip! generate service files from desktop files

 tools/Makefile.am                           |   14 +++
 tools/gnome-session-desktop-app-generator.c |  142 +++++++++++++++++++++++++++
 2 files changed, 156 insertions(+), 0 deletions(-)
---
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 57b82c7..57940b9 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -41,6 +41,20 @@ gnome_session_inhibit_CPPFLAGS =             \
 gnome_session_inhibit_LDADD =                  \
        $(GNOME_SESSION_LIBS)
 
+if HAVE_SYSTEMD
+gnome_session_desktop_app_generator_LDADD =    \
+       $(GIO_LIBS)
+
+gnome_session_desktop_app_generator_SOURCES =  \
+       gnome-session-desktop-app-generator.c
+
+generatordir=$(prefix)/lib/systemd/user-generators
+
+gnome-session-desktop-app-generator-install-hook:
+       $(MKDIR_P) $(DESTDIR)$(generatordir)
+       -rm -f $(DESTDIR)$(generatordir)/gnome-session-desktop-app-generator
+#endif
+
 gnome_session_check_accelerated_helper_SOURCES =               \
        gnome-session-check-accelerated-common.h                \
        gnome-session-check-accelerated-helper.c
diff --git a/tools/gnome-session-desktop-app-generator.c b/tools/gnome-session-desktop-app-generator.c
new file mode 100644
index 0000000..aa77a39
--- /dev/null
+++ b/tools/gnome-session-desktop-app-generator.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <config.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+static void
+write_unit_file_for_app_info (const char      *unit_dir,
+                              GDesktopAppInfo *app_info)
+{
+        gboolean activatable;
+        char *contents;
+        gboolean contents_set;
+        GError *error = NULL;
+        const char *source_path, *name, *description, *exec_binary;
+        g_autofree char *desktop_id = NULL, *unit_path = NULL, *unit_file = NULL, *exec_line = NULL;
+
+        source_path = g_desktop_app_info_get_filename (app_info);
+
+        if (source_path == NULL) {
+                return;
+        }
+
+        desktop_id = g_path_get_basename (source_path);
+
+        activatable = g_desktop_app_info_get_boolean (app_info, G_KEY_FILE_DESKTOP_KEY_DBUS_ACTIVATABLE);
+
+        /* skip apps that are supposed to be bus activated */
+        if (activatable && g_dbus_is_name (desktop_id)) {
+                return;
+        }
+
+        name = g_app_info_get_display_name (G_APP_INFO (app_info));
+
+        if (name == NULL) {
+                return;
+        }
+
+        description = g_app_info_get_description (G_APP_INFO (app_info));
+
+        if (description == NULL) {
+                description = "";
+        }
+
+        exec_line = g_strdup (g_app_info_get_commandline (G_APP_INFO (app_info)));
+
+        if (exec_line == NULL) {
+                return;
+        }
+
+        exec_binary = g_app_info_get_executable (G_APP_INFO (app_info));
+
+        if (!g_path_is_absolute (exec_binary)) {
+                gint argc;
+                char **argv;
+                char *absolute_exec_binary;
+                char *new_exec_line;
+
+                if (!g_str_has_prefix (exec_line, exec_binary)) {
+                        return;
+                }
+                absolute_exec_binary = g_find_program_in_path (exec_binary);
+
+                if (!absolute_exec_binary) {
+                        return;
+                }
+
+                new_exec_line = g_strjoin ("", absolute_exec_binary,
+                                           exec_line + strlen (exec_binary));
+                g_free (exec_line);
+                exec_line = new_exec_line;
+        }
+
+        contents = g_string_printf (contents,
+                                    "# Automatically generated by gnome-session-desktop-app-generator\n"
+                                    "\n"
+                                    "[Unit]\n"
+                                    "SourcePath=%s\n"
+                                    "Description=Desktop Application: %s: %s\n"
+                                    "\n"
+                                    "[Service]\n"
+                                    "ExecStart=%s\n"
+                                    "Type=simple\n"
+                                    source_path,
+                                    name,
+                                    description,
+                                    exec_line);
+
+        unit_file = g_strdup_printf ("desktop-app-%s.service", desktop_id);
+        unit_path = g_build_filename (unit_dir, unit_file, NULL);
+        contents_set = g_file_set_contents (unit_path, contents->str, contents->len, &error);
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+        char *unit_dir;
+        GList *app_infos, *node;
+
+        if (argc != 4) {
+                g_error ("generator called with incorrect arguments");
+                return 1;
+        }
+
+        unit_dir = argv[3];
+
+        app_infos = g_app_info_get_all ();
+
+        for (node = app_infos; node != NULL; node = node->next) {
+                GDesktopAppInfo *app_info;
+
+                if (!G_IS_DESKTOP_APP_INFO (node->data)) {
+                        continue;
+                }
+
+                app_info = G_DESKTOP_APP_INFO (node->data);
+
+                write_unit_file_for_app_info (unit_dir, app_info);
+        }
+
+        g_list_free_full (app_infos, g_object_unref);
+
+        return 0;
+}