source_path must be relative to where terraform is run

[ers81239]

I created this PR to better document and report errors based on how source_path is interpreted currently.

However, now I see that the current behavior is more of a problem than before. I've created an ./examples/example1 dir for my module which has a main.tf that calls my custom module with a source of ../../. When I run terraform plan from within this examples directory, the source_path specified in the source is being interpreted relative to this example1 directory instead of from the module's root directory.

This causes a source_path must be set error.

Recommended Fix:

Interpret source_paths relative to the location of the terraform file in which they are named.

[ers81239]

I was able to work around this by specifying source_path with "${path.module}/lambda_source_dir". I still think my PR should be accepted.

[antonbabenko]

I have just merged your PR where documentation was updated.

Happy New Year!

[github-actions]

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