Validation

ops0 validates your IaC code in two layers before any deployment runs: syntax validation (via terraform validate) and lint checking (via TFLint). Both must pass before the plan stage is allowed to proceed.

Validation Layers

When Validation Runs

Validation triggers automatically in three situations:

You can also trigger it manually at any time by clicking Validate in the project toolbar.

Syntax Validation

Runs terraform validate (or tofu validate / oxid validate depending on engine) against all files in the project.

Success Output

✓ Terraform Validation Passed

Checked 12 files in 2.3 seconds
No issues found

Failure Output

✗ Terraform Validation Failed — 3 errors in 2 files

main.tf:
  Line 15: Unsupported argument "instance_types" on resource "aws_instance"
  Line 23: Missing required argument "ami"

modules/database/main.tf:
  Line 8: Invalid reference: var.databse_name (did you mean var.database_name?)

Errors are also shown inline in the editor with red underline markers and margin indicators.

Common Syntax Errors

Missing required argument

Error: Missing required argument
  The argument "ami" is required.

Fix: Add the missing argument to the resource block.

Unsupported argument

Error: Unsupported argument
  An argument named "instance_types" is not expected here.
  Did you mean "instance_type"?

Fix: Check the provider docs for the correct argument name.

Invalid reference

Error: Reference to undeclared resource
  There is no resource "aws_vpc" "main" declared.

Fix: Declare the resource or correct the reference.

Missing closing brace

Error: Invalid block definition
  Missing closing brace for resource block starting at line 10.

Fix: Add the missing }.

TFLint

TFLint runs after syntax validation passes. It applies provider-specific rules and best-practice checks that terraform validate cannot catch.

What TFLint Checks

TFLint Output

Findings are shown per-file with severity and line number:

TFLint Results — 2 findings

main.tf:
  ⚠ WARNING  Line 12: aws_instance.web — "t3.xxxxlarge" is not a valid instance type (aws_instance_invalid_type)
  ℹ NOTICE   Line 45: aws_s3_bucket.data — Missing required tag "Environment" (required_tags)

Severity Levels

Validation History

Every validation run is recorded with its full output, trigger type, and findings. Access the history from Project → Validation History.

What's Recorded

TFLint Finding Details

Each TFLint finding in history includes:

Pagination

History is paginated (20 entries per page). Use the Previous / Next controls to browse older runs.

Fixing Validation Errors

Next Steps