system tests: new interactive tests

[edsantiago]

socat can create a dummy PTY that we can manipulate. This
lets us run a variety of tests that we couldn't before,
involving "run -it", and stty, and even "load" with no args.

Signed-off-by: Ed Santiago [email protected]

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[rhatdan]

Nice work @edsantiago
LGTM

[Luap99]

/lgtm

[vrothberg]

That is really cool stuff, @edsantiago !

[edsantiago]

Thank you @vrothberg ! Do you think there's a way to make it work with the shortnames prompt? I tried for a while before submitting but could never get the prompt, only the fallback. (Perhaps because stdout is a pipe - it has to be?) Anyhow, if you can think of any other tests that could benefit from this, please LMK.

[vrothberg]

Do you think there's a way to make it work with the shortnames prompt? I tried for a while before submitting but could never get the prompt, only the fallback. (Perhaps because stdout is a pipe - it has to be?)

That would be fantastic. If stdout is a pipe, that may be the issue. The prompt wants stdin and stdout to be a terminal.

Anyhow, if you can think of any other tests that could benefit from this, please LMK.

podman login could be a good candidate. It may prompt for user/pw.

[Luap99]

@edsantiago I just saw one of the tests flake in #9423, see https://cirrus-ci.com/task/5159880362295296?logs=main#L195

[edsantiago]

@Luap99 thank you. I was seeing that during development, it's a race condition that I'll need to chase and file a bug for.