iac-apply

name

iac-apply

description

Actually APPLY an Infrastructure-as-Code change — the highest-stakes mutator in nyann; it can mutate real cloud infrastructure. Re-runs the plan, shows it, confirms with the user, then invokes `bin/iac-apply.sh --apply` (adding `--confirm-destroy` only when the user explicitly confirms a destructive change). UNMISTAKABLY opt-in: apply is never the default, destructive applies need a second explicit confirmation. TRIGGER when the user says "terraform apply", "apply the infra change", "deploy this infrastructure", "tofu apply", "cdk deploy", "pulumi up", "helm upgrade", "kubectl apply", "apply the plan", "run the apply now", "yes apply it" (in an IaC context), "ship the infra change", "provision this", "/nyann:apply". DISAMBIGUATION — fire ONLY for IaC apply intent on a detected infra repo. Do NOT trigger on the generic word "apply": NOT "apply this code patch", NOT "apply the suggestion", NOT "apply formatting", NOT "apply a migration" (DB migrations are out of scope), NOT "apply for X". An infra signal is REQUIRED — a tool name (terraform/tofu/cdk/pulumi/ helm/kubectl/kustomize/ansible), OR the word "infra"/"infrastructure"/ "deploy"/"provision", OR a detected `iac.tool` in the stack descriptor. With no infra signal, do NOT trigger. To only PREVIEW (no apply), that's `/nyann:plan` (the iac-plan skill) — iac-apply always previews first internally, but its purpose is the mutation.

iac-apply

Wraps bin/iac-apply.sh. This is the highest-stakes mutator in nyann — it can change real cloud infrastructure. Read this end to end before invoking. The gate ladder below is enforced in the script, not just prose; your job is to drive the flags in the right order and never shortcut a confirmation.

The script mirrors bin/undo.sh's preview-before-mutate contract: apply is never the default. Without --apply it previews and exits 0. --dry-run always wins over --apply. A destructive plan needs a second explicit confirmation on top of --apply. The output is a JSON object on stdout (status: preview|applied|skipped|refused, plus tool, unit, summary, destructive, optional record_path, exit_code, message).

0. This skill is opt-in — confirm intent first

Never invoke an apply because a plan looked ready. Only proceed when the user has clearly asked to apply/deploy/provision on an infra repo (see DISAMBIGUATION). If they only wanted to see the diff, route to /nyann:plan. Confirm there's an infra signal (a tool name, an "infra"/"deploy" intent, or a detected .iac.tool) before doing anything.

1. Always preview the plan first — show it back

Always obtain an IacPlan before applying — iac-apply.sh computes one internally (or reads --plan <iacplan.json> if you already ran /nyann:plan and saved it). Either way, run a preview pass first and show the add/change/destroy summary to the user:

bin/iac-apply.sh --target <cwd> [--unit <repo-rel-path>]   # no --apply → preview

This emits status:"preview", exits 0, and mutates nothing. Render .summary (e.g. "+3 add, ~1 change, -2 destroy"), .destructive, and .destructive_known exactly as the iac-plan skill does. If the preview's plan came back status:"skipped" (CLI/backend/creds absent), the apply emits status:"skipped" exit 0 — surface .message, and stop: there is nothing to apply. If the plan was status:"refused" (unknown tool / --unit traversal), apply emits status:"refused" exit 1 — relay .message and fix the input.

2. Confirm before applying (MANDATORY on destroy)

This is the human gate. How you confirm depends on whether the plan is destructive:

Non-destructive plan (destructive:false)

Only possible for a structured tool with destroy == 0. Show the add/change counts and ask a plain yes/no: "Apply this change? (+N add, ~M change, no destroys)". Proceed only on an explicit yes. Skip this only if the user already said "just apply it, don't ask".

Destructive plan (destructive:true) — AskUserQuestion is REQUIRED

This covers any structured plan with destroy > 0 and every advisory plan (helm/kubernetes/kustomize/ansible — destructive_known:false, where destruction can't be ruled out from a text diff). You MUST call the AskUserQuestion tool (not plain text) and get an explicit go-ahead before adding --confirm-destroy:

{
  "questions": [
    {
      "question": "This apply is DESTRUCTIVE — it will destroy or replace real infrastructure. Confirm?",
      "header": "Confirm destroy",
      "multiSelect": false,
      "options": [
        { "label": "No, stop (Recommended)", "description": "Do not apply. Nothing is mutated. Re-review the plan first." },
        { "label": "Yes, apply the destroy", "description": "Proceed. Resources WILL be destroyed/replaced — this is not reversible by nyann." }
      ]
    }
  ]
}

For an advisory destructive plan, add that the destroy count is unknown (destructive_known:false): the tool gave only a text diff, so nyann treats it as potentially destructive. Strongly recommend reading the raw diff (the plan's raw_path) before confirming.

Pass --confirm-destroy only after the user picks "Yes". Pass --confirmed true explicitly to record that a human confirmed (the CLI defaults --confirmed to the --confirm-destroy value for headless parity, but this skill should always pass it explicitly after the AskUserQuestion).

3. Invoke the real apply

bin/iac-apply.sh \
  --target <cwd> \
  [--unit <repo-rel-path>] \
  [--plan <iacplan.json>] \
  --apply \
  [--confirm-destroy --confirmed]      # ONLY after the user confirms a destroy

The script walks this exact gate ladder — drive the flags to match it:

1. Plan obtained first. skipped plan → status:"skipped" exit 0 (no apply). refused plan → status:"refused" exit 1.
2. Gate 1 — preview by default. No --apply (or any --dry-run) → status:"preview", exit 0, nothing applied. --dry-run beats --apply.
3. Gate 2 — destructive confirmation. Reached only with --apply and no --dry-run. Calls bin/guards/iac-apply-confirmation.sh. Non-destructive plan → guard returns pass + skipped ("not-required") and the apply proceeds. Destructive plan → guard passes only when --confirm-destroy true AND --confirmed true; otherwise apply emits status:"refused" exit 1 and nothing is applied. The guard fails CLOSED on a missing/unparseable plan.
4. Gate 3 — CLI presence. If the apply CLI is absent → status:"skipped" exit 0, no apply, no record.
5. Execute. Runs (cd <unit_dir> && <tool apply cmd>) >&2 — the tool's output goes straight to the operator's terminal and is never captured by nyann (it can echo state).
6. Record. On a real apply it writes an IacApplyRecord (schemas/iac-apply-record.schema.json) under <target>/memory/.nyann/iac-applies/<ISO-ts>/manifest.json — metadata only (tool, unit, summary, the satisfied gate flags, plan_sha256, and the apply's honest exit_code). NO credentials, NO secrets, NO state, NO raw plan bytes.

Per-tool apply command (the script picks it from tool): terraform/opentofu → terraform|tofu apply -input=false <plan.tfplan> (reuses the plan binary iac-plan saved; falls back to -auto-approve); aws-cdk → cdk deploy --require-approval never; pulumi → pulumi up --yes --non-interactive; helm → helm upgrade --install <unit-basename> .; kubernetes → kubectl apply -f .; kustomize → kubectl apply -k .; ansible → ansible-playbook <site.yml|playbook.yml>.

4. Interpret the outcome

Branch on .status:

status	What happened	What to tell the user
applied	The apply ran. Read .exit_code: 0 = the tool succeeded; non-zero = the tool reported failure (recorded honestly).	Report success/failure with the counts. Point to .record_path for the audit record. On non-zero exit, the tool's own output (in their terminal) has the error — relay that they should read it.
preview	No --apply (or --dry-run overrode it). Nothing was applied.	Show the summary; if they meant to apply, re-run with --apply (and confirm).
refused	A gate blocked the apply — most often the destructive-confirmation gate without --confirm-destroy/--confirmed, or a refused plan. Exit 1. Nothing applied.	Relay .message. For the destroy case: re-run only after an explicit AskUserQuestion confirm, then pass --confirm-destroy --confirmed.
skipped	CLI/backend/creds absent, or the plan was skipped. Exit 0. Nothing applied, no record.	Surface .message (what's missing). Can't proceed until the CLI/creds are present.

5. After a real apply

• Point the user at .record_path (the IacApplyRecord) so they — and teammates — can audit the change. It's metadata only; it contains no secrets or state, so it's safe to commit.
• The tool's actual output (resource diffs, errors) went to their terminal, not into nyann's JSON. If they ask "what exactly changed", direct them to that output and to the plan's raw_path.
• nyann does NOT roll back infrastructure. If the apply was wrong, the remedy is a new corrective plan/apply (or the tool's own state recovery), not a nyann undo.

When to hand off

• "Just show me the diff" / "preview only" / "don't apply" → /nyann:plan (iac-apply previews internally but its purpose is the mutation; for preview-only use plan).
• "apply this code patch" / "apply the review suggestion" / "apply formatting" / "apply the DB migration" → NOT this skill. See DISAMBIGUATION — those are not IaC applies.
• "undo the infra change" → there is no nyann undo for infrastructure. Explain that the fix is a corrective apply or the tool's own state recovery, never a nyann rollback.