CLI tool

[shibumi]

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People at Kubecon 2021 mentioned that they want a CLI tool for in-toto-golang. There is a cli tool for testing in one of our forks. We should adopt it.

Description of issue or feature request:

Provide a cli tool via a separate cmd directory.

Current behavior:

This repository just provides a library.

Expected behavior:

This library should also provide a cli tool with basic functionality.

[adityasaky]

Curious, are they using in-toto-golang already and therefore don't want to install in-toto-python because it's redundant?

I believe the CLI you're referring to is: https://github.com/boxboat/in-toto-golang/tree/master/in_toto/cmd

[shibumi]

@adityasaky yes, I am referring to this CLI. As far as I know the CLI was just there for easier testing and I really like the idea of having a CLI for integration tests and so on. I think with a CLI we could much easier test if the go library produces the same result like the in-toto cli.

EDIT: Additionally, the go cli would be much easier to install than the python cli. For python you need the python interpreter + pulling all that dependencies, this is a problem on some systems (not all systems provide python). A go program can however be easily cross-compiled for different systems.

EDIT2: I don't have a exact use case for this. Maybe routers that run an in-toto binary to verify an upgrade?

[adityasaky]

Closed by #56.