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tg-migrate-scaffold

Generates Terragrunt scaffold with placeholder values for legacy Terraform migration.

Updated Jul 22, 2026
Search Tags:#devops#migration#scaffold#terraform#gitlab-ci#infrastructure-as-code#terragrunt
One-click install
npx skills add https://github.com/Trigent-Software-Pvt-Ltd/trigen-aidlc --skill tg-migrate-scaffold-trigent-software-pvt-ltd
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: tg-migrate-scaffold
Source: https://github.com/Trigent-Software-Pvt-Ltd/trigen-aidlc/tree/main/plugins/terragrunt-migrate/skills/tg-migrate-scaffold
Command: npx skills add https://github.com/Trigent-Software-Pvt-Ltd/trigen-aidlc --skill tg-migrate-scaffold-trigent-software-pvt-ltd

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Migrating legacy Terraform repositories to a Terragrunt structure requires manually creating root configs, environment directories, module conversions, and CI pipelines, which is error-prone and repetitive. ## Core Features & Use Cases - Scaffold Generation: Creates root.hcl, all environment directories, and per-service subdirectories with placeholder terragrunt.hcl files. - Module Conversion: Transforms legacy .tf code into single-file _modules/ with all variables defaulted and is_secondary patterns for DR regions. - Envcommon & Pipeline Generation: Builds _envcommon/*.hcl dependency chains with mock_outputs and a .gitlab-ci.yml covering all environments. - Use Case: After completing Phase 1 analysis of a legacy Terraform repo, run this phase to produce the full Terragrunt directory structure with PLACEHOLDER values ready for population in Phase 3. ## Quick Start Run the tg-migrate-scaffold skill with the legacy repo path and target repo path to generate the full Terragrunt scaffold after Phase 1 analysis is approved.

Frequently Asked Questions about tg-migrate-scaffold

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I migrate a legacy Terraform repo to Terragrunt?▼

Run the phased migration workflow: complete Phase 1 analysis first, then use this scaffold phase to generate root.hcl, environment directories, _modules/, _envcommon/, and .gitlab-ci.yml. All values use __PLACEHOLDER__ format until Phase 3 populates real values.

How to convert Terraform modules to Terragrunt single-file modules?▼

The migration_convert_modules step transforms legacy .tf code into a single main.tf per module under _modules/. Each module must have all variables defaulted and must not contain provider, backend, or version blocks.

What prerequisites are needed before generating a Terragrunt scaffold?▼

Phase 1 analysis must be complete and its state loadable via migration_get_state for the target path. The user must also have approved the migration plan before scaffolding begins.

Does the scaffold include real environment values?▼

No. All environments receive placeholder values in the format __PLACEHOLDER_{variable_name}__. Real values are populated later in Phase 3, one environment at a time.

How are service dependencies handled in Terragrunt _envcommon files?▼

The migration_generate_envcommon step creates _envcommon/*.hcl files with dependency chains from Phase 1 analysis and mock_outputs. Mock outputs allow init, validate, plan, import, show, and apply commands.

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