terraform: Eval module call arguments for import #25890
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Include the import walk in the list of operations for which we create an
EvalModuleCallArgument node. This causes module call arguments to be
evaluated even if the module variables have defaults, ensuring that
invalid default values (such as the common "{}" for variables thought of
as maps) do not cause failures specific to import.
This fixes a bug where a child module evaluates an input variable in its
locals block, assuming that it is a nested object structure. The bug
report includes a default value of "{}", which is overridden by a root
variable value. Without the eval node added in this commit, the default
value is used and the local evaluation errors.
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mildwonkey
approved these changes
Aug 18, 2020
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This LGTM, and import (MY NEMESIS!!!) being broken kind of feels like its default state, so while we should make sure this doesn't make @jbardin twitch I don't see any cause for concern with this change.
Absolutely perfect and wonderfully helpful test commentary, thank you muchly for that!
jbardin
approved these changes
Aug 18, 2020
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Include the import walk in the list of operations for which we create an
EvalModuleCallArgumentnode. This causes module call arguments to be evaluated even if the module variables have defaults, ensuring that invalid default values (such as the common{}for variables thought of as maps) do not cause failures specific to import.This fixes a bug where a child module evaluates an input variable in its locals block, assuming that it is a nested object structure. The bug report includes a default value of
{}, which is overridden by a root variable value. Without the eval node added in this commit, the default value is used and the local evaluation errors.Note: I'm surprised that we weren't evaluating module call arguments for imports, as that seems like it would break import for module expansion in many cases. Is this intentional, and will this change therefore break something else?
Fixes #25888; see reproduction here.