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Terraform · Azure · Devops / AGENT SKILL
terraform-azurerm-set-diff-analyzer
0
Distinguish ordering-only Terraform AzureRM plan diffs from actual resource changes.
Analyze Terraform plan JSON output for AzureRM Provider to distinguish between false-positive diffs (order-only changes in Set-type attributes) and actual resource changes. Use when reviewing terraform plan output for Azure resources like Application Gateway, Load Balancer, Firewall, Front Door, NSG, and other resources with Set-type attributes that cause spurious diffs due to internal ordering changes.
Understand the trade-offs.
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Original instructions from the publisher’s SKILL.md
# Terraform AzureRM Set Diff Analyzer A skill to identify "false-positive diffs" in Terraform plans caused by AzureRM Provider's Set-type attributes and distinguish them from actual changes. ## When to Use - `terraform plan` shows many changes, but you only added/removed a single element - Application Gateway, Load Balancer, NSG, etc. show "all elements changed" - You want to automatically filter false-positive diffs in CI/CD ## Background Terraform's Set type compares by position rather than by key, so when adding or removing elements, all elements appear as "changed". This is a general Terraform issue, but it's particularly noticeable with AzureRM resources that heavily use Set-type attributes like Application Gateway, Load Balancer, and NSG. These "false-positive diffs" don't actually affect the resources, but they make reviewing terraform plan output difficult. ## Prerequisites - Python 3.8+ If Python is unavailable, install via your package manager (e.g., `apt install python3`, `brew install python3`) or from [python.org](https://www.python.org/downloads/). ## Basic Usage ```bash # 1. Generate plan JSON output terraform plan -out=plan.tfplan terraform show -json plan.tfplan > plan.json # 2. Analyze python scripts/analyze_plan.py plan.json ``` ## Troubleshooting - **`python: command not found`**: Use `python3` instead, or install Python - **`ModuleNotFoundError`**: Script uses only standard library; ensure Python 3.8+ ## Detailed Documentation - [scripts/README.md](scripts/README.md) - All options, output formats, exit codes, CI/CD examples - [references/azurerm_set_attributes.md](references/azurerm_set_attributes.md) - Supported resources and attributes