segfault

import svn.core    import svn.client    svn.core.apr_initialize()pool = svn.core.svn_pool_create(None)ctx = svn.client.svn_client_create_context(pool)#ctx.auth_baton = svn_auth_open()ctx.config = svn.core.svn_config_get_config("ughdir", pool)revision = svn.core.svn_opt_revision_t()revision.kind = svn.core.svn_opt_revision_headsvn.client.svn_client_checkout("https://a", ".", revision, True, ctx, pool)