Commits on Jun 24, 2020

1. lang/funcs: Filesystem functions hint about dynamically-generated files …

   The functions that interact with the filesystem are, by design, restricted
   to reading files that are distributed as a static part of the
   configuration, and cannot be used to interact with files that are
   generated dynamically by resources in the configuration.
   
   However, new users have often yet developed a correct mental model of how
   Terraform execution works and are confused by the terse error messages
   these functions return. As an interim step to help some of those users,
   this just adds some more commentary to the error message which gives a
   vague, generic directive to look to attributes of the resource that is
   generating the file, which should (if it's designed well) export
   attributes that allow the resulting file to be used effectively with
   common patterns, such as checksums of the content of the generated file.
   
   The error message here is not particularly attractive due to the
   limitations of the context where it's being returned from, but I'm
   accepting that here in the interest of keeping this change simple, so we
   can give a hint about a case that seems to frequently generate new-user
   questions. We may iterate further on the presentation of this message
   later.

   

   apparentlymart committed Jun 24, 2020
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