[gnome-builder] runtime-manager: recover from NOT_SUPPORTED errors

[Christian Hergert <chergert src gnome org>]

commit bdd4f686273cafbcc99b8fe521f349a074a6abe3
Author: Christian Hergert <chergert redhat com>
Date:   Thu Feb 16 14:18:43 2017 -0800

    runtime-manager: recover from NOT_SUPPORTED errors
    
    If the runtime provider does not support installing runtimes, then just
    go ahead and synthesize a proper result if the runtime is available.
    
    This fixes our issue where we need to try to install the runtime always
    in case that it needs additional components.

 libide/runtimes/ide-runtime-manager.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)
---
diff --git a/libide/runtimes/ide-runtime-manager.c b/libide/runtimes/ide-runtime-manager.c
index d925f20..f06bff9 100644
--- a/libide/runtimes/ide-runtime-manager.c
+++ b/libide/runtimes/ide-runtime-manager.c
@@ -404,8 +404,28 @@ ide_runtime_manager_ensure_finish (IdeRuntimeManager  *self,
                                    GAsyncResult       *result,
                                    GError            **error)
 {
+  g_autoptr(GError) local_error = NULL;
+  IdeRuntime *ret;
+
   g_return_val_if_fail (IDE_IS_RUNTIME_MANAGER (self), NULL);
   g_return_val_if_fail (G_IS_TASK (result), NULL);
 
-  return g_task_propagate_pointer (G_TASK (result), error);
+  ret = g_task_propagate_pointer (G_TASK (result), &local_error);
+
+  /*
+   * If we got NOT_SUPPORTED error, and the runtime already exists,
+   * then we can synthesize a successful result to the caller.
+   */
+  if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED))
+    {
+      const gchar *runtime_id = g_task_get_task_data (G_TASK (result));
+      ret = ide_runtime_manager_get_runtime (self, runtime_id);
+      if (ret != NULL)
+        return ret;
+    }
+
+  if (error != NULL)
+    *error = g_steal_pointer (&local_error);
+
+  return ret;
 }