terraform/terraform/eval_validate_selfref.go

68 lines
2.0 KiB
Go

package terraform
import (
"fmt"
"github.com/hashicorp/hcl2/hcl"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/lang"
"github.com/hashicorp/terraform/tfdiags"
)
// EvalValidateSelfRef is an EvalNode implementation that checks to ensure that
// expressions within a particular referencable block do not reference that
// same block.
type EvalValidateSelfRef struct {
Addr addrs.Referenceable
Config hcl.Body
ProviderSchema **ProviderSchema
}
func (n *EvalValidateSelfRef) Eval(ctx EvalContext) (interface{}, error) {
var diags tfdiags.Diagnostics
addr := n.Addr
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 n.ProviderSchema == nil || *n.ProviderSchema == nil {
return nil, fmt.Errorf("provider schema unavailable while validating %s for self-references; this is a bug in Terraform and should be reported", addr)
}
providerSchema := *n.ProviderSchema
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 {
return nil, fmt.Errorf("no schema available for %s to validate for self-references; this is a bug in Terraform and should be reported", addr)
}
refs, _ := lang.ReferencesInBlock(n.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 nil, diags.NonFatalErr()
}