blob: ff00cded7514671d13625ecb906103af487daecf [file] [log] [blame]
package terraform
import (
"fmt"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/terraform/internal/addrs"
"github.com/hashicorp/terraform/internal/configs/configschema"
"github.com/hashicorp/terraform/internal/lang"
"github.com/hashicorp/terraform/internal/tfdiags"
)
// validateSelfRef checks to ensure that expressions within a particular
// referencable block do not reference that same block.
func validateSelfRef(addr addrs.Referenceable, config hcl.Body, providerSchema *ProviderSchema) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
addrStrs := make([]string, 0, 1)
addrStrs = append(addrStrs, addr.String())
switch tAddr := addr.(type) {
case addrs.ResourceInstance:
// A resource instance may not refer to its containing resource either.
addrStrs = append(addrStrs, tAddr.ContainingResource().String())
}
if providerSchema == nil {
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))
return diags
}
var schema *configschema.Block
switch tAddr := addr.(type) {
case addrs.Resource:
schema, _ = providerSchema.SchemaForResourceAddr(tAddr)
case addrs.ResourceInstance:
schema, _ = providerSchema.SchemaForResourceAddr(tAddr.ContainingResource())
}
if schema == nil {
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))
return diags
}
refs, _ := lang.ReferencesInBlock(config, schema)
for _, ref := range refs {
for _, addrStr := range addrStrs {
if ref.Subject.String() == addrStr {
diags = diags.Append(&hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Self-referential block",
Detail: fmt.Sprintf("Configuration for %s may not refer to itself.", addrStr),
Subject: ref.SourceRange.ToHCL().Ptr(),
})
}
}
}
return diags
}