Add Terraform Version Check

[skorfmann]

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Description

Reduce confusion to users running an older version of Terraform by printing out a warning notice when Terraform < 0.12

The functionality could also be useful when new versions of Terraform are being released (e.g. 0.13 with the changed provider naming schema).

References

#208

[bverhoeve]

Hi @skorfmann I'm looking to contribute to the repository, what exactly needs to be done?

[skorfmann]

Hi @skorfmann I'm looking to contribute to the repository, what exactly needs to be done?

For the case where a user uses something below 0.12, it would be great to display a clear error message and exit the process. The supported Terraform versions at the moment are 0.12 and 0.13. I think the check should go like this:

• < SUPPORTED => exit with error message
• >= SUPPORTED => continue without further message.

We do have a terraform check already, which checks for the presence of the Terraform CLI only. This could be expanded to check against supported versions and print a helpful error message.

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ps: I was thinking about if it would make sense to print a warning when a user is using > SUPPORTED (e.g. alpha of 0.14 at the moment). However, I think it's not important for now and I'd ignore this case until we actually run into issues with a case like that.

[bverhoeve]

Okay, thanks for the explanation! I'll check to tend to it.

[skorfmann]

This was addressed in #378

[github-actions]

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