add -force-copy option to init command

[jbardin]

The -force-copy option will suppress confirmation for copying state
data.

Modify some tests to use the option, making sure to leave coverage of
the Input code path.

fixes #12921

[mitchellh]

One typo.

This works great for now. In the future we should consider exposing setting values for the "id" set on InputOpts. It is why they are there we just don't have a way to short-circuit them right now in non-test code. That would let us more easily do force flags without having to special case branches.

[mitchellh]

I think this is a stray tab char.

[jbardin]

@mitchellh, thanks for the confirmation, I wasn't sure if that was the plan for the input ID and was going to look into it later ;)

[ianpackard]

The documentation for init command is missing this flag.

[kilpatty]

Is there any way to force a no...?

[nbering]

@s-pk If you use -input=false and a prompt is required it will error out instead of prompting.

Edit:

Here's the documenation for that. You can also set it with an environment variable.

[tonglil]

@nbering but I don't want to error out, I don't want to copy.

[nbering]

@tonglil I think the context of my comment may have been lost. I suspect the person I was replying to deleted their account, because their comment is missing and that name's profile comes up with a 404.

Despite that, I think what you're looking for is the -reconfigure flag, which ignores the existing backend configuration, so it won't prompt and will just set up the new backend ignoring the old configuration.

https://www.terraform.io/docs/commands/init.html#backend-initialization

[ghost]

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