[gnome-software/wip/rancell/ubuntu-3-20-rebase: 1/28] Use dpkg-deb info to create a GsApp when double clicking on a .deb file

[Robert Ancell <rancell src gnome org>]

commit b667d40207fa88ad2ae324695b2a960978b7cbc8
Author: William Hua <william hua canonical com>
Date:   Thu Apr 7 09:19:27 2016 +0100

    Use dpkg-deb info to create a GsApp when double clicking on a .deb file
    
    Signed-off-by: Richard Hughes <richard hughsie com>

 src/plugins/Makefile.am                    |    6 ++
 src/plugins/gs-plugin-appstream.c          |    1 +
 src/plugins/gs-plugin-dpkg.c               |  123 ++++++++++++++++++++++++++++
 src/plugins/gs-plugin-packagekit-refresh.c |   12 +++
 4 files changed, 142 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/Makefile.am b/src/plugins/Makefile.am
index 5ea32be..ba6da26 100644
--- a/src/plugins/Makefile.am
+++ b/src/plugins/Makefile.am
@@ -32,6 +32,7 @@ plugin_LTLIBRARIES =                                  \
        libgs_plugin_appstream.la                       \
        libgs_plugin_dummy.la                           \
        libgs_plugin_hardcoded-featured.la              \
+       libgs_plugin_dpkg.la                            \
        libgs_plugin_hardcoded-blacklist.la             \
        libgs_plugin_moduleset.la                       \
        libgs_plugin_menu-spec-categories.la            \
@@ -76,6 +77,11 @@ libgs_plugin_dummy_la_LIBADD = $(GS_PLUGIN_LIBS)
 libgs_plugin_dummy_la_LDFLAGS = -module -avoid-version
 libgs_plugin_dummy_la_CFLAGS = $(GS_PLUGIN_CFLAGS) $(WARN_CFLAGS)
 
+libgs_plugin_dpkg_la_SOURCES = gs-plugin-dpkg.c
+libgs_plugin_dpkg_la_LIBADD = $(GS_PLUGIN_LIBS)
+libgs_plugin_dpkg_la_LDFLAGS = -module -avoid-version
+libgs_plugin_dpkg_la_CFLAGS = $(GS_PLUGIN_CFLAGS) $(WARN_CFLAGS)
+
 libgs_plugin_fedora_distro_upgrades_la_SOURCES = gs-plugin-fedora-distro-upgrades.c
 libgs_plugin_fedora_distro_upgrades_la_LIBADD = $(GS_PLUGIN_LIBS) $(JSON_GLIB_LIBS) $(SOUP_LIBS)
 libgs_plugin_fedora_distro_upgrades_la_LDFLAGS = -module -avoid-version
diff --git a/src/plugins/gs-plugin-appstream.c b/src/plugins/gs-plugin-appstream.c
index 14f7db2..f6a84fc 100644
--- a/src/plugins/gs-plugin-appstream.c
+++ b/src/plugins/gs-plugin-appstream.c
@@ -90,6 +90,7 @@ gs_plugin_order_after (GsPlugin *plugin)
 {
        static const gchar *deps[] = {
                "menu-spec-categories", /* need category list */
+               "dpkg",                 /* need package name */
                NULL };
        return deps;
 }
diff --git a/src/plugins/gs-plugin-dpkg.c b/src/plugins/gs-plugin-dpkg.c
new file mode 100644
index 0000000..20c0e9e
--- /dev/null
+++ b/src/plugins/gs-plugin-dpkg.c
@@ -0,0 +1,123 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2011-2013 Richard Hughes <richard hughsie com>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include <gs-plugin.h>
+#include <gs-utils.h>
+
+#define DPKG_DEB_BINARY                "/usr/bin/dpkg-deb"
+
+/**
+ * gs_plugin_get_name:
+ */
+const gchar *
+gs_plugin_get_name (void)
+{
+       return "dpkg";
+}
+
+/**
+ * gs_plugin_initialize:
+ */
+void
+gs_plugin_initialize (GsPlugin *plugin)
+{
+       if (!g_file_test (DPKG_DEB_BINARY, G_FILE_TEST_EXISTS)) {
+               g_debug ("disabling '%s' as no %s available",
+                        plugin->name, DPKG_DEB_BINARY);
+               gs_plugin_set_enabled (plugin, FALSE);
+       }
+}
+
+/**
+ * gs_plugin_filename_to_app:
+ */
+gboolean
+gs_plugin_filename_to_app (GsPlugin *plugin,
+                          GList **list,
+                          const gchar *filename,
+                          GCancellable *cancellable,
+                          GError **error)
+{
+       GsApp *app;
+       g_autofree gchar *content_type = NULL;
+       g_autofree gchar *description = NULL;
+       g_autofree gchar *output = NULL;
+       g_auto(GStrv) argv = NULL;
+       g_auto(GStrv) tokens = NULL;
+       const gchar *mimetypes[] = {
+               "application/vnd.debian.binary-package",
+               NULL };
+
+       /* does this match any of the mimetypes we support */
+       content_type = gs_utils_get_content_type (filename, cancellable, error);
+       if (content_type == NULL)
+               return FALSE;
+       if (!g_strv_contains (mimetypes, content_type))
+               return TRUE;
+
+       /* exec sync */
+       argv = g_new0 (gchar *, 5);
+       argv[0] = g_strdup (DPKG_DEB_BINARY);
+       argv[1] = g_strdup ("--showformat=${Package}\\n"
+                           "${Version}\\n"
+                           "${Installed-Size}\\n"
+                           "${Homepage}\\n"
+                           "${Description}");
+       argv[2] = g_strdup ("-W");
+       argv[3] = g_strdup (filename);
+       if (!g_spawn_sync (NULL, argv, NULL,
+                          G_SPAWN_SEARCH_PATH | G_SPAWN_STDERR_TO_DEV_NULL,
+                          NULL, NULL, &output, NULL, NULL, error))
+               return FALSE;
+
+       /* parse output */
+       tokens = g_strsplit (output, "\n", 0);
+       if (g_strv_length (tokens) < 5) {
+               g_set_error (error,
+                            GS_PLUGIN_ERROR,
+                            GS_PLUGIN_ERROR_FAILED,
+                            "dpkg-deb output format incorrect:\n\"%s\"\n", output);
+               return FALSE;
+       }
+
+       /* create app */
+       app = gs_app_new (NULL);
+       gs_app_set_state (app, AS_APP_STATE_AVAILABLE_LOCAL);
+       gs_app_add_source (app, tokens[0]);
+       gs_app_set_name (app, GS_APP_QUALITY_LOWEST, tokens[0]);
+       gs_app_set_version (app, tokens[1]);
+       gs_app_set_size (app, 1024 * atoi (tokens[2]));
+       gs_app_set_url (app, AS_URL_KIND_HOMEPAGE, tokens[3]);
+       gs_app_set_summary (app, GS_APP_QUALITY_LOWEST, tokens[4]);
+       gs_app_set_kind (app, AS_APP_KIND_GENERIC);
+
+       /* multiline text */
+       description = g_strjoinv (NULL, tokens + 5);
+       gs_app_set_description (app, GS_APP_QUALITY_LOWEST, description + 1);
+
+       /* success */
+       gs_plugin_add_app (list, app);
+       return TRUE;
+}
diff --git a/src/plugins/gs-plugin-packagekit-refresh.c b/src/plugins/gs-plugin-packagekit-refresh.c
index 5d3de2e..9069751 100644
--- a/src/plugins/gs-plugin-packagekit-refresh.c
+++ b/src/plugins/gs-plugin-packagekit-refresh.c
@@ -50,6 +50,18 @@ gs_plugin_get_name (void)
 }
 
 /**
+ * gs_plugin_get_conflicts:
+ */
+const gchar **
+gs_plugin_get_conflicts (GsPlugin *plugin)
+{
+       static const gchar *deps[] = {
+               "dpkg",
+               NULL };
+       return deps;
+}
+
+/**
  * gs_plugin_initialize:
  */
 void