Affects Version/s: None
Fix Version/s: None
The Ruby binding for delta path-driver is broken.
r1852536 fixed a bug in handling of slash-prefixed paths, whereby a "/" path was handled as a regular path not as a root path. That exposed the bug in the bindings for the path-driver: it assumes the callback always gets a non-null "parent_dir_baton", but that's not so for the root path.
The relevant function is 'svn_swig_rb_delta_path_driver_cb_func' which dereferences 'ib' (the parent_baton argument), but the problem extends to the whole delta-editor bindings because this function tries to return a dir-baton that includes 'ib->editor', and if it can't do that, it looks like the other editor methods won't be able to work.
Fixing it looks too difficult for me.
In principle, it's Just a matter of passing the required info through the "callback_baton" argument instead, but that's currently coded as a standard type shared by many callback types.
Better... The new svn_delta_path_driver3() passes the 'editor' and 'edit_baton' directly to the svn_delta_path_driver_cb_func2_t callback type. The 'edit_baton' of the existing Ruby binding of the delta-editor contains the required information, it appears.