terraform-azurerm-set-diff-analyzer

作者： github

識別 Terraform AzureRM 計劃中由 Set 類型屬性排序導致的誤報差異。分析 terraform plan JSON 輸出，區分虛假差異（Set 中元素重新排序）與實際資源變更。針對具有 Set 類型屬性的 AzureRM 資源：Application Gateway、Load Balancer、NSG、Firewall、Front Door 等。需要 Python 3.8+，僅使用標準庫；可整合至 CI/CD 管道，支援可配置的輸出格式與退出碼。協助審查者...

npx skills add https://github.com/github/awesome-copilot --skill terraform-azurerm-set-diff-analyzer

下載 ZIP GitHub

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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.

Basic Usage

# 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+