fdpass: send stderr to tbot for error diagnostics #43547
Merged
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This PR updates fdpass and tbot to pass the fdpass stderr file descriptor to tbot so that it can be used by tbot to output error messages. The file descriptor is not required (so fdpass doesn't necessarily have to be updated, and, in fact, this PR doesn't update the behavior of
tbot ssh-multiplexer-proxy-command
) and a file descriptor sent over the socket will just get discarded (and thus closed) if tbot wasn't updated to receive it.changelog: improved error diagnostics when using Machine ID's SSH multiplexer