Dynamic Terraform/OpenTofu Version Detection

Support dynamic detection and usage of Terraform/OpenTofu versions based on version definitions already present in codebases. This avoids duplicating version definitions in Spacelift configuration and aligns with local developer workflows.

Core Feature Scope

1. Auto-detect versions from common versioning files
   Auto-detect the version from:

   • .terraform-version

   • .tool-versions (used by asdf)

   • .tfswitchrc

   • required_version in .tf files (with logic to use the lowest matching version)

2. Auto-detection should happen in both:

   • Root directory

   • Module directories

3. Fallback behavior:
   Ability to define a default/fallback version at the org or stack level (optional but configurable).

We’re using Renovate to auto-bump Terraform versions within their .tf files directly. WE do not want to manage a separate .terraform-version or .tofu-version file or make manual updates in Spacelift stacks. We want to maintain:

hcl

CopyEdit

required_version = ">=x.y.z"

And have Spacelift:

• Automatically use the lowest compatible version from that constraint

• Avoid hardcoding the version in the stack config or using custom Docker images