Merge pull request #29521 from hashicorp/alisdair/disable-experiment-warnings

configs: Disable experiment warnings at link time

internal/configs/experiments.go

@@ -9,6 +9,16 @@ import (
 	"github.com/zclconf/go-cty/cty"
 )
 
+// When developing UI for experimental features, you can temporarily disable
+// the experiment warning by setting this package-level variable to a non-empty
+// value using a link-time flag:
+//
+// go install -ldflags="-X 'github.com/hashicorp/terraform/internal/configs.disableExperimentWarnings=yes'"
+//
+// This functionality is for development purposes only and is not a feature we
+// are committing to supporting for end users.
+var disableExperimentWarnings = ""
+
 // sniffActiveExperiments does minimal parsing of the given body for
 // "terraform" blocks with "experiments" attributes, returning the
 // experiments found.
@@ -126,17 +136,19 @@ func decodeExperimentsAttr(attr *hcl.Attribute) (experiments.Set, hcl.Diagnostic
 			// No error at all means it's valid and current.
 			ret.Add(exp)
 
-			// However, experimental features are subject to breaking changes
-			// in future releases, so we'll warn about them to help make sure
-			// folks aren't inadvertently using them in places where that'd be
-			// inappropriate, particularly if the experiment is active in a
-			// shared module they depend on.
-			diags = diags.Append(&hcl.Diagnostic{
-				Severity: hcl.DiagWarning,
-				Summary:  fmt.Sprintf("Experimental feature %q is active", exp.Keyword()),
-				Detail:   "Experimental features are subject to breaking changes in future minor or patch releases, based on feedback.\n\nIf you have feedback on the design of this feature, please open a GitHub issue to discuss it.",
-				Subject:  expr.Range().Ptr(),
-			})
+			if disableExperimentWarnings == "" {
+				// However, experimental features are subject to breaking changes
+				// in future releases, so we'll warn about them to help make sure
+				// folks aren't inadvertently using them in places where that'd be
+				// inappropriate, particularly if the experiment is active in a
+				// shared module they depend on.
+				diags = diags.Append(&hcl.Diagnostic{
+					Severity: hcl.DiagWarning,
+					Summary:  fmt.Sprintf("Experimental feature %q is active", exp.Keyword()),
+					Detail:   "Experimental features are subject to breaking changes in future minor or patch releases, based on feedback.\n\nIf you have feedback on the design of this feature, please open a GitHub issue to discuss it.",
+					Subject:  expr.Range().Ptr(),
+				})
+			}
 
 		default:
 			// This should never happen, because GetCurrent is not documented