[gnome-software] rpm-ostree: Implement distro upgrade downloading

[Kalev Lember <klember src gnome org>]

commit 0763e8a42566619a605192ca4ac8469a20c2bbf7
Author: Kalev Lember <klember redhat com>
Date:   Wed Jul 4 11:59:38 2018 +0200

    rpm-ostree: Implement distro upgrade downloading
    
    This just hardcodes rebasing to ostree://fedora/%s/x86_64/workstation,
    where %s is the next available distro version. In the future, we can
    hopefully be smarter with contructing the refspec, but this is a start.

 plugins/rpm-ostree/gs-plugin-rpm-ostree.c | 62 +++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
---
diff --git a/plugins/rpm-ostree/gs-plugin-rpm-ostree.c b/plugins/rpm-ostree/gs-plugin-rpm-ostree.c
index 6d1abaa1..206d967b 100644
--- a/plugins/rpm-ostree/gs-plugin-rpm-ostree.c
+++ b/plugins/rpm-ostree/gs-plugin-rpm-ostree.c
@@ -794,6 +794,68 @@ gs_plugin_refine (GsPlugin *plugin,
        return TRUE;
 }
 
+gboolean
+gs_plugin_app_upgrade_download (GsPlugin *plugin,
+                                GsApp *app,
+                                GCancellable *cancellable,
+                                GError **error)
+{
+       GsPluginData *priv = gs_plugin_get_data (plugin);
+       const char *packages[] = { NULL };
+       g_autofree gchar *new_refspec = NULL;
+       g_autofree gchar *transaction_address = NULL;
+       g_autoptr(GVariant) options = NULL;
+
+       /* only process this app if was created by this plugin */
+       if (g_strcmp0 (gs_app_get_management_plugin (app), gs_plugin_get_name (plugin)) != 0)
+               return TRUE;
+
+       /* check is distro-upgrade */
+       if (gs_app_get_kind (app) != AS_APP_KIND_OS_UPGRADE)
+               return TRUE;
+
+       /* construct new refspec based on the distro version we're upgrading to */
+       new_refspec = g_strdup_printf ("ostree://fedora/%s/x86_64/workstation",
+                                      gs_app_get_version (app));
+
+       options = make_rpmostree_options_variant (FALSE,  /* reboot */
+                                                 FALSE,  /* allow-downgrade */
+                                                 FALSE,  /* cache-only */
+                                                 TRUE,   /* download-only */
+                                                 FALSE,  /* skip-purge */
+                                                 FALSE,  /* no-pull-base */
+                                                 FALSE,  /* dry-run */
+                                                 FALSE); /* no-overrides */
+
+       gs_app_set_state (app, AS_APP_STATE_INSTALLING);
+       if (!gs_rpmostree_os_call_rebase_sync (priv->os_proxy,
+                                              options,
+                                              new_refspec,
+                                              packages,
+                                              NULL /* fd list */,
+                                              &transaction_address,
+                                              NULL /* fd list out */,
+                                              cancellable,
+                                              error)) {
+               gs_utils_error_convert_gio (error);
+               gs_app_set_state_recover (app);
+               return FALSE;
+       }
+
+       if (!gs_rpmostree_transaction_get_response_sync (priv->sysroot_proxy,
+                                                        transaction_address,
+                                                        cancellable,
+                                                        error)) {
+               gs_utils_error_convert_gio (error);
+               gs_app_set_state_recover (app);
+               return FALSE;
+       }
+
+       /* state is known */
+       gs_app_set_state (app, AS_APP_STATE_UPDATABLE);
+       return TRUE;
+}
+
 gboolean
 gs_plugin_launch (GsPlugin *plugin,
                   GsApp *app,