"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.

首先使用 remote.ls_remotes()、remote.fetch() 和 remote.push() 重现这两个调用序列，然后检查 issue 中描述的 connect_or_reset_options() 和 git_remote_push() 路径。完成的标准是：在 ls_remotes() 之后直接 push 能够成功且不会出现 GIT_ERROR_NET 错误，并为该序列提供回归覆盖。