"this operation is only valid for push"

The sequence of calls

remote.ls_remotes(...)
remote.fetch(...)
remote.push(...)

works, while

remote.ls_remotes(...)
remote.push(...)

doesn't, producing the GIT_ERROR_NET / "this operation is only valid for push" error.

I think this is because ls_remotes() explicitly calls connect(..., GIT_DIRECTION_FETCH), and fetch() implicitly calls disconnect() (within git_remote_fetch()). If fetch() is not called between ls_remotes() and push(), git_remote_push() encounters an existing connection with FETCH direction, and returns an error (from git_smart__get_push_stream()).

This could be addressed in several ways: either by disconnecting explicitly in ls_remotes(), or maybe by changing the implementation of connect_or_reset_options() and the functions it calls to handle the case where direction is changing.

まず remote.ls_remotes()、remote.fetch()、remote.push() を使って2つの呼び出しシーケンスを再現し、次に connect_or_reset_options() と、issueで説明されている git_remote_push() のパスを調査します。ls_remotes() の直後に直接 push しても GIT_ERROR_NET エラーなしで成功し、そのシーケンスに対するリグレッションカバレッジがあることを完了条件とします。