61 lines
1.9 KiB
Go
61 lines
1.9 KiB
Go
package terraform
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/terraform/internal/addrs"
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"github.com/hashicorp/terraform/internal/configs/configschema"
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"github.com/hashicorp/terraform/internal/lang"
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"github.com/hashicorp/terraform/internal/tfdiags"
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)
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// validateSelfRef checks to ensure that expressions within a particular
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// referencable block do not reference that same block.
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func validateSelfRef(addr addrs.Referenceable, config hcl.Body, providerSchema *ProviderSchema) tfdiags.Diagnostics {
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var diags tfdiags.Diagnostics
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addrStrs := make([]string, 0, 1)
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addrStrs = append(addrStrs, addr.String())
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switch tAddr := addr.(type) {
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case addrs.ResourceInstance:
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// A resource instance may not refer to its containing resource either.
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addrStrs = append(addrStrs, tAddr.ContainingResource().String())
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}
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if providerSchema == nil {
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diags = diags.Append(fmt.Errorf("provider schema unavailable while validating %s for self-references; this is a bug in Terraform and should be reported", addr))
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return diags
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}
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var schema *configschema.Block
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switch tAddr := addr.(type) {
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case addrs.Resource:
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schema, _ = providerSchema.SchemaForResourceAddr(tAddr)
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case addrs.ResourceInstance:
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schema, _ = providerSchema.SchemaForResourceAddr(tAddr.ContainingResource())
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}
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if schema == nil {
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diags = diags.Append(fmt.Errorf("no schema available for %s to validate for self-references; this is a bug in Terraform and should be reported", addr))
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return diags
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}
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refs, _ := lang.ReferencesInBlock(config, schema)
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for _, ref := range refs {
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for _, addrStr := range addrStrs {
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if ref.Subject.String() == addrStr {
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Self-referential block",
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Detail: fmt.Sprintf("Configuration for %s may not refer to itself.", addrStr),
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Subject: ref.SourceRange.ToHCL().Ptr(),
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})
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}
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}
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}
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return diags
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}
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