terraform/CHANGELOG.md

## 1.15.0 (Unreleased)


NEW FEATURES:

* We now produce builds for Windows ARM64 ([#32719](https://github.com/hashicorp/terraform/issues/32719))

* You can set a `deprecated` attribute on variable and output blocks to indicate that they are deprecated. This will produce warnings when passing in a value for a deprecated variable or when referencing a deprecated output. ([#38001](https://github.com/hashicorp/terraform/issues/38001))

* backend/s3: Support authentication via `aws login` ([#37976](https://github.com/hashicorp/terraform/issues/37976))

* validate: The validate command now checks the `backend` block. This ensures the backend type exists, that all required attributes are present, and that the backend's own validation logic passes. ([#38021](https://github.com/hashicorp/terraform/issues/38021))

* `convert` function, which allows for precise inline type conversions ([#38160](https://github.com/hashicorp/terraform/issues/38160))

* Terraform now supports variables and locals in module source and version attributes ([#38217](https://github.com/hashicorp/terraform/issues/38217))


ENHANCEMENTS:

* ssh-based provisioner (file + remote-exec): Re-enable support for PowerShell ([#37794](https://github.com/hashicorp/terraform/issues/37794))

* terraform init log timestamps include millisecond precision ([#37818](https://github.com/hashicorp/terraform/issues/37818))

* init: skip dependencies declared in development override. This allows you to use `terraform init` with developer overrides and install dependencies that are not declared in the override file. ([#37884](https://github.com/hashicorp/terraform/issues/37884))

* Terraform Test: Allow functions within mock blocks ([#34672](https://github.com/hashicorp/terraform/issues/34672))

* improve detection of deprecated resource attributes / blocks ([#38077](https://github.com/hashicorp/terraform/issues/38077))

* Deprecation messages providers set on resources / blocks / attributes are now part of the deprecation warning ([#38135](https://github.com/hashicorp/terraform/issues/38135))

* Include which attribute paths are marked as sensitive in list_start JSON logs ([#38197](https://github.com/hashicorp/terraform/issues/38197))


BUG FIXES:

* testing: File-level error diagnostics are now included in JUnit XML skipped test elements, ensuring CI/CD pipelines can detect validation failures ([#37801](https://github.com/hashicorp/terraform/issues/37801))

* A refresh-only plan could result in a non-zero exit code with no changes ([#37406](https://github.com/hashicorp/terraform/issues/37406))

* cli: Fixed crash in `terraform show -json` when plan contains ephemeral resources with preconditions or postconditions ([#37834](https://github.com/hashicorp/terraform/issues/37834))

* cli: Fixed `terraform init -json` to properly format all backend configuration messages as JSON instead of plain text ([#37911](https://github.com/hashicorp/terraform/issues/37911))

* `state show`: The `state show` command will now explicitly fail and return code 1 when it fails to render the named resources state ([#37933](https://github.com/hashicorp/terraform/issues/37933))

* apply: Terraform will raise an explicit error if a plan file intended for one workspace is applied against another workspace ([#37954](https://github.com/hashicorp/terraform/issues/37954))

* lifecycle: `replace_triggered_by` now reports an error when given an invalid attribute reference that does not exist in the target resource ([#36740](https://github.com/hashicorp/terraform/issues/36740))

* backend: Fix nil pointer dereference crash during `terraform init` when the destination backend returns an error ([#38027](https://github.com/hashicorp/terraform/issues/38027))

* stacks: send progress events if the plan fails for better UI integration ([#38039](https://github.com/hashicorp/terraform/issues/38039))

* stacks: component instances should report no-op plan/apply. This solves a UI inconsistency with convergence destroy plans  ([#38049](https://github.com/hashicorp/terraform/issues/38049))

* backend/http: Return conflicting lock info from HTTP backend instead of the lock that failed to be taken ([#38144](https://github.com/hashicorp/terraform/issues/38144))

* states: fixed a bug that caused Terraform to be unable to identify when two states had different output values. This may have caused issues in specific circumstances like backend migrations. ([#38181](https://github.com/hashicorp/terraform/issues/38181))


NOTES:

* command/init: Provider installation was refactored to enable future enhancements in the area. This results in different order of operations during init and 2 new log messages replacing one (`initializing_provider_plugin_message`). The change should not have any end-user impact aside from the `init` command output. ([#38227](https://github.com/hashicorp/terraform/issues/38227))


UPGRADE NOTES:

* backend/s3: The `AWS_USE_FIPS_ENDPOINT` and `AWS_USE_DUALSTACK_ENDPOINT` environment variables now only respect `true` or `false` values, aligning with the AWS SDK for Go. This replaces the previous behavior which treated any non-empty value as `true`. ([#37601](https://github.com/hashicorp/terraform/issues/37601))


EXPERIMENTS:

Experiments are only enabled in alpha releases of Terraform CLI. The following features are not yet available in stable releases.

- The experimental "deferred actions" feature, enabled by passing the `-allow-deferral` option to `terraform plan`, permits `count` and `for_each` arguments in `module`, `resource`, and `data` blocks to have unknown values and allows providers to react more flexibly to unknown values.
- `terraform test cleanup`: The experimental `test cleanup` command. In experimental builds of Terraform, a manifest file and state files for each failed cleanup operation during test operations are saved within the `.terraform` local directory. The `test cleanup` command will attempt to clean up the local state files left behind automatically, without requiring manual intervention.
- `terraform test`: `backend` blocks and `skip_cleanup` attributes:
  - Test authors can now specify `backend` blocks within `run` blocks in Terraform Test files. Run blocks with `backend` blocks will load state from the specified backend instead of starting from empty state on every execution. This allows test authors to keep long-running test infrastructure alive between test operations, saving time during regular test operations.
  - Test authors can now specify `skip_cleanup` attributes within test files and within run blocks. The `skip_cleanup` attribute tells `terraform test` not to clean up state files produced by run blocks with this attribute set to true. The state files for affected run blocks will be written to disk within the `.terraform` directory, where they can then be cleaned up manually using the also experimental `terraform test cleanup` command.

## Previous Releases

For information on prior major and minor releases, refer to their changelogs:

- [v1.14](https://github.com/hashicorp/terraform/blob/v1.14/CHANGELOG.md)
- [v1.13](https://github.com/hashicorp/terraform/blob/v1.13/CHANGELOG.md)
- [v1.12](https://github.com/hashicorp/terraform/blob/v1.12/CHANGELOG.md)
- [v1.11](https://github.com/hashicorp/terraform/blob/v1.11/CHANGELOG.md)
- [v1.10](https://github.com/hashicorp/terraform/blob/v1.10/CHANGELOG.md)
- [v1.9](https://github.com/hashicorp/terraform/blob/v1.9/CHANGELOG.md)
- [v1.8](https://github.com/hashicorp/terraform/blob/v1.8/CHANGELOG.md)
- [v1.7](https://github.com/hashicorp/terraform/blob/v1.7/CHANGELOG.md)
- [v1.6](https://github.com/hashicorp/terraform/blob/v1.6/CHANGELOG.md)
- [v1.5](https://github.com/hashicorp/terraform/blob/v1.5/CHANGELOG.md)
- [v1.4](https://github.com/hashicorp/terraform/blob/v1.4/CHANGELOG.md)
- [v1.3](https://github.com/hashicorp/terraform/blob/v1.3/CHANGELOG.md)
- [v1.2](https://github.com/hashicorp/terraform/blob/v1.2/CHANGELOG.md)
- [v1.1](https://github.com/hashicorp/terraform/blob/v1.1/CHANGELOG.md)
- [v1.0](https://github.com/hashicorp/terraform/blob/v1.0/CHANGELOG.md)
- [v0.15](https://github.com/hashicorp/terraform/blob/v0.15/CHANGELOG.md)
- [v0.14](https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md)
- [v0.13](https://github.com/hashicorp/terraform/blob/v0.13/CHANGELOG.md)
- [v0.12](https://github.com/hashicorp/terraform/blob/v0.12/CHANGELOG.md)
- [v0.11 and earlier](https://github.com/hashicorp/terraform/blob/v0.11/CHANGELOG.md)