Terraform Modules in Package Sub-directories

When the source of a module is a version control repository or archive file (generically, a “package”), the module itself may be in a sub-directory relative to the root of the package.

A special double-slash syntax is interpreted by Terraform to indicate that the remaining path after that point is a sub-directory within the package. For example:

If the source address has arguments, such as the ref argument supported for the version control sources, the sub-directory portion must be before those arguments:

Terraform will still extract the entire package to local disk, but will read the module from the subdirectory. As a result, it is safe for a module in a sub-directory of a package to use a local path to another module as long as it is in the same package.

https://www.terraform.io/docs/modules/sources.html#modules-in-package-sub-directories

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