### Terraform Version ```shell $ terraform version Terraform v1.14.3 on darwin_arm64 + provider registry.terraform.io/cyrilgdn/postgresql v1.26.0 ``` ### Terraform Configuration Files # ./main.tf ```terraform terraform { required_providers { postgresql = { source = "cyrilgdn/postgresql" } } } provider "postgresql" { alias = "source" host = "127.0.0.1" port = 5432 username = "postgres" password = "postgres" } provider "postgresql" { alias = "destination" host = "127.0.0.1" port = 5432 username = "postgres" password = "postgres" } module "replication" { source = "./replication" providers = { postgresql.source = postgresql.source postgresql.destination = postgresql.destination } } # module "new" { # source = "./new" # } ``` # ./replication/main.tf ```terraform terraform { required_providers { postgresql = { source = "cyrilgdn/postgresql" configuration_aliases = [ postgresql.source, postgresql.destination, ] } } } ``` # ./new (Empty directory) ### Debug Output ``` $ TF_LOG=DEBUG terraform plan 2026-01-15T15:45:29.226+0100 [INFO] Terraform version: 1.14.3 2026-01-15T15:45:29.227+0100 [DEBUG] using github.com/hashicorp/go-tfe v1.94.0 2026-01-15T15:45:29.227+0100 [DEBUG] using github.com/hashicorp/hcl/v2 v2.24.0 2026-01-15T15:45:29.227+0100 [DEBUG] using github.com/hashicorp/terraform-svchost v0.1.1 2026-01-15T15:45:29.227+0100 [DEBUG] using github.com/zclconf/go-cty v1.16.3 2026-01-15T15:45:29.227+0100 [INFO] Go runtime version: go1.25.5 2026-01-15T15:45:29.227+0100 [INFO] CLI args: []string{"/usr/local/Cellar/tfenv/3.0.0/versions/1.14.3/terraform", "plan"} 2026-01-15T15:45:29.227+0100 [DEBUG] Attempting to open CLI config file: /Users/magul/.terraformrc 2026-01-15T15:45:29.227+0100 [DEBUG] File doesn't exist, but doesn't need to. Ignoring. 2026-01-15T15:45:29.227+0100 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2026-01-15T15:45:29.227+0100 [DEBUG] ignoring non-existing provider search directory /Users/magul/.terraform.d/plugins 2026-01-15T15:45:29.227+0100 [DEBUG] ignoring non-existing provider search directory /Users/magul/Library/Application Support/io.terraform/plugins 2026-01-15T15:45:29.227+0100 [DEBUG] ignoring non-existing provider search directory /Library/Application Support/io.terraform/plugins 2026-01-15T15:45:29.227+0100 [INFO] CLI command args: []string{"plan"} 2026-01-15T15:45:29.241+0100 [DEBUG] checking for provisioner in "." 2026-01-15T15:45:29.241+0100 [DEBUG] checking for provisioner in "/usr/local/Cellar/tfenv/3.0.0/versions/1.14.3" 2026-01-15T15:45:29.242+0100 [INFO] backend/local: starting Plan operation ╷ │ Error: Provider type mismatch │ │ on main.tf line 4, in module "replication": │ 4: postgresql.source = postgresql.source │ │ The local name "postgresql.source" in the root module represents provider "hashicorp/postgresql", but "postgresql.source" in │ module.replication represents "cyrilgdn/postgresql". │ │ Each provider has its own distinct configuration schema and provider types, so this module's "postgresql.source" can be assigned │ only a configuration for cyrilgdn/postgresql, which is not required by module.replication. ╵ ╷ │ Error: Provider type mismatch │ │ on main.tf line 5, in module "replication": │ 5: postgresql.destination = postgresql.destination │ │ The local name "postgresql.destination" in the root module represents provider "hashicorp/postgresql", but "postgresql.destination" │ in module.replication represents "cyrilgdn/postgresql". │ │ Each provider has its own distinct configuration schema and provider types, so this module's "postgresql.destination" can be │ assigned only a configuration for cyrilgdn/postgresql, which is not required by module.replication. ╵ ╷ │ Error: Module not installed │ │ on main.tf line 9: │ 9: module "new" { │ │ This module is not yet installed. Run "terraform init" to install all modules required by this configuration. ╵ ``` ### Expected Behavior Terraform should properly recognize non-HashiCorp providers, even if they are passed as aliases to sub-modules. ### Actual Behavior When running plan (with not-yet-initialized module) Terraform complains about ``` │ The local name "postgresql.destination" in the root module represents provider "hashicorp/postgresql", but "postgresql.destination" │ in module.replication represents "cyrilgdn/postgresql". │ │ Each provider has its own distinct configuration schema and provider types, so this module's "postgresql.destination" can be │ assigned only a configuration for cyrilgdn/postgresql, which is not required by module.replication. ``` ### Steps to Reproduce 1. run `terraform init` 2. run `terraform plan` 3. uncomment ```terraform module "new" { source = "./new" } ``` 4. run `terraform plan` 5. observe errors ### Additional Context AFAIK this is limited only to providers passed to aliases (default providers are not complained about). After running `terraform init` (which succeed) `terraform plan` do not complain anymore. ### References #33784 - this looks similar, but is about ` terraform init`, where in my situation `terraform init` make problem go away. ### Generative AI / LLM assisted development? _No response_