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Merge pull request #26334 from hashicorp/alisdair/deprecate-nested-redundant-interpolation-expressions 

configs: Deprecate nested redundant interpolations
This commit is contained in:
Alisdair McDiarmid 2020-09-22 14:11:52 -04:00 committed by GitHub
parent 85ddb386ec 13ed5af5c8
commit 0a5f2d9047
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 25 additions and 19 deletions
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36
configs/compat_shim.go
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@ -142,23 +142,27 @@ func warnForDeprecatedInterpolationsInBody(body hcl.Body) hcl.Diagnostics {
}
func warnForDeprecatedInterpolationsInExpr(expr hcl.Expression) hcl.Diagnostics {
var diags hcl.Diagnostics
if _, ok := expr.(*hclsyntax.TemplateWrapExpr); !ok {
// We're only interested in TemplateWrapExpr, because that's how
// the HCL native syntax parser represents the case of a template
// that consists entirely of a single interpolation expression, which
// is therefore subject to the special case of passing through the
// inner value without conversion to string.
return diags
node, ok := expr.(hclsyntax.Node)
if !ok {
return nil
}
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagWarning,
Summary: "Interpolation-only expressions are deprecated",
Detail: "Terraform 0.11 and earlier required all non-constant expressions to be provided via interpolation syntax, but this pattern is now deprecated. To silence this warning, remove the \"${ sequence from the start and the }\" sequence from the end of this expression, leaving just the inner expression.\n\nTemplate interpolation syntax is still used to construct strings from expressions when the template includes multiple interpolation sequences or a mixture of literal strings and interpolations. This deprecation applies only to templates that consist entirely of a single interpolation sequence.",
Subject: expr.Range().Ptr(),
})
return hclsyntax.VisitAll(node, func(n hclsyntax.Node) hcl.Diagnostics {
e, ok := n.(*hclsyntax.TemplateWrapExpr)
if !ok {
// We're only interested in TemplateWrapExpr, because that's how
// the HCL native syntax parser represents the case of a template
// that consists entirely of a single interpolation expression, which
// is therefore subject to the special case of passing through the
// inner value without conversion to string.
return nil
}
return diags
return hcl.Diagnostics{&hcl.Diagnostic{
Severity: hcl.DiagWarning,
Summary: "Interpolation-only expressions are deprecated",
Detail: "Terraform 0.11 and earlier required all non-constant expressions to be provided via interpolation syntax, but this pattern is now deprecated. To silence this warning, remove the \"${ sequence from the start and the }\" sequence from the end of this expression, leaving just the inner expression.\n\nTemplate interpolation syntax is still used to construct strings from expressions when the template includes multiple interpolation sequences or a mixture of literal strings and interpolations. This deprecation applies only to templates that consist entirely of a single interpolation sequence.",
Subject: e.Range().Ptr(),
}}
})
}

8
configs/testdata/warning-files/redundant_interp.tf vendored
View File

@ -29,9 +29,7 @@ resource "null_resource" "a" {
# in the template.
template = " ${var.triggers["greeting"]} "
# No warning for this one, because it's embedded inside a more complex
# expression and our check is only for direct assignment to attributes.
wrapped = ["${var.triggers["greeting"]}"]
wrapped = ["${var.triggers["greeting"]}"] # WARNING: Interpolation-only expressions are deprecated
}
}
@ -41,6 +39,10 @@ module "foo" {
}
data "null_data_source" "b" {
inputs = {
host = "${var.triggers["host"]}" # WARNING: Interpolation-only expressions are deprecated
}
has_computed_default = "${var.foo}" # WARNING: Interpolation-only expressions are deprecated
}