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Awesome-copilot terraform-azurerm-set-diff-analyzer

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.

install
source · Clone the upstream repo
git clone https://github.com/github/awesome-copilot
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/github/awesome-copilot "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/terraform-azurerm-set-diff-analyzer" ~/.claude/skills/github-awesome-copilot-terraform-azurerm-set-diff-analyzer && rm -rf "$T"
manifest: skills/terraform-azurerm-set-diff-analyzer/SKILL.md
tags
#terraform#azure#automation#diff-analysis#json#python
source content

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+

Detailed Documentation