[gnome-builder] flatpak: allow spawning gnome-builder-flatpak with gdbserver

[Christian Hergert <chergert src gnome org>]

commit 201e9e3501c1ba4168c21770bafc7404d3884830
Author: Christian Hergert <chergert redhat com>
Date:   Thu Nov 18 12:58:32 2021 -0800

    flatpak: allow spawning gnome-builder-flatpak with gdbserver
    
    In the case we need to debug this, it is really handy to be able to connect
    to the gnome-builder-flatpak process with gdbserver.

 src/plugins/flatpak/gbp-flatpak-client.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/src/plugins/flatpak/gbp-flatpak-client.c b/src/plugins/flatpak/gbp-flatpak-client.c
index ec6443651..5c5d19112 100644
--- a/src/plugins/flatpak/gbp-flatpak-client.c
+++ b/src/plugins/flatpak/gbp-flatpak-client.c
@@ -176,10 +176,14 @@ gbp_flatpak_client_parent_set (IdeObject *object,
                                           G_SUBPROCESS_FLAGS_STDIN_PIPE);
   ide_subprocess_launcher_set_cwd (launcher, g_get_home_dir ());
   ide_subprocess_launcher_set_clear_env (launcher, FALSE);
-#if 0
-  ide_subprocess_launcher_push_argv (launcher, "gdbserver");
-  ide_subprocess_launcher_push_argv (launcher, "localhost:8888");
-#endif
+
+  if (g_getenv ("BUILDER_FLATPAK_DEBUG") != NULL)
+    {
+      ide_subprocess_launcher_setenv (launcher, "G_DEBUG", "fatal-criticals", TRUE);
+      ide_subprocess_launcher_push_argv (launcher, "gdbserver");
+      ide_subprocess_launcher_push_argv (launcher, "localhost:8888");
+    }
+
   ide_subprocess_launcher_push_argv (launcher, PACKAGE_LIBEXECDIR"/gnome-builder-flatpak");
 
   self->supervisor = ide_subprocess_supervisor_new ();