DEVOPS
PR Terraform Plan Gate with Drift-Aware GitHub Comment
On every infrastructure pull request, runs terraform plan, warns inline if the PR collides with un-reconciled live drift, and posts the full plan as a GitHub comment before merge.
How it runs
The automated pipeline, trigger to output.
- TriggerGitHub pull_request opened/syncedGitHub
- ActionRun terraform plan for PR branchShell
- LogicCompare touched resources vs drift set
- LogicFlag overlap with un-reconciled drift
- OutputPost/update GitHub PR plan commentGitHub
What it does
When an infra pull request opens or updates, this workflow runs `terraform plan` against current live state, detects whether the PR's changes overlap resources that have already drifted out-of-band, and posts a GitHub comment with the plan plus a prominent warning if merging would silently overwrite that live drift.
When to use it
Use it when reviewers approve Terraform PRs without realizing live infrastructure has changed since the branch was cut. The gate prevents an apply from clobbering an emergency console fix that nobody imported back into state.
How it works
- 1A GitHub trigger fires on pull_request opened or synchronized for infra paths.
- 2A shell action runs `terraform plan` for the PR branch against live state.
- 3A logic step compares the plan's touched resources against the current drift set.
- 4A logic step sets a warning flag when the PR overlaps un-reconciled drift.
- 5An output step posts (or updates) a single GitHub PR comment with the plan summary and, if flagged, a blocking drift warning and the conflicting resource list.
Set it up
What you configure once, before turning it on.
- 1Connect GitHubRepos, issues, pull requests, actions.
- 2Connect ShellRun sandboxed commands inside the workspace.
- 3Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
- 4Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
- 5Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.
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