feat: Docker daemon network policy apply engine stage - #83
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Add render_docker_daemon_config() to desired_state.py, which translates the already-validated CI_FLEET_DOCKER_DEFAULT_ADDRESS_POOL_* rendered env values into the daemon.json default-address-pools block. Returns an empty dict when no policy is rendered (no-op). Add test_apply_docker_network_policy.py with RED-GREEN coverage for: - valid pool rendering from env - rejection of negative/malformed pool count and CIDRs - no-op when policy absent This is the validation-before-mutation foundation for the Docker network policy rollout engine stage.
Add scripts/apply-docker-network-policy.sh — the transactional apply half of the Docker network policy rollout engine stage. It: - Is a no-op when no policy is rendered (safe for unrelated controllers) - Renders desired daemon.json default-address-pools via the existing render_docker_daemon_config() validator (detection stays separate) - Preserves all unrelated daemon.json keys during merge - Backs up the exact prior daemon.json for rollback (into --checkpoint dir or a temp work dir) - Restarts Docker ONLY through CI_FLEET_DOCKER_RESTART_COMMAND boundary - Runs bounded capacity probe (CI_FLEET_DOCKER_NETWORK_PROBE) and health verification (CI_FLEET_HEALTH_CHECK_COMMAND) - Rolls back the exact prior config and re-verifies on any restart/probe health failure - Exposes failure evidence without leaking CIDRs or secrets Update test for restart boundary to assert on daemon_dir location. All 13 tests pass; shellcheck clean.
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Implements the transactional apply, reapply, and removal stage for the Docker network policy work tracked by #81.
Summary
scripts/apply-docker-network-policy.shfor serialized, drained updates to the manageddefault-address-poolskey.daemon.jsonkeys and records durable rollback state with prior-key provenance.Goal
Safely apply, reapply, and remove ci-fleet-managed Docker default-address-pools during an exclusive maintenance transaction on a ci-fleet host.
Acceptance gates
Supported failure model
The transaction recovers from hook failure or timeout, Docker restart, probe, or health failure, catchable signals at documented durable phases, and process interruption recoverable by the next reconciliation from a durable checkpoint. If rollback cannot be verified, it retains exact recovery evidence, keeps the controller drained, and requires operator recovery.
Trust boundaries
Root-owned environment, checkpoint, lock, and path configuration are trusted administrative inputs. Basic ownership, mode, node-type, schema, numeric-bound, and obvious lexical or inode alias invariants remain required. The stage validates non-root input, rendered desired state crossing into host mutation, and existing daemon content.
Concurrency model
ci-fleet is the only supported
daemon.jsonwriter during the maintenance transaction. External configuration managers and humans must not modify the file until the transaction ends. This PR does not preserve or merge concurrent external updates.Non-goals
daemon.jsonwriters.daemon.jsontransaction engine.Follow-up policy
Hardening outside this contract stays out of this branch. A follow-up requires separate operator authorization.
Stop condition
Stop when contract-visible findings have verified dispositions, accepted findings have focused regressions, all required local gates and exact-head Actions pass, local and published heads match, the worktree is clean, and one fully paginated post-fix review is complete. A later finding that changes architecture, trust, concurrency, or failure guarantees returns to the operator without another implementation round.
Test evidence at the current head
032bed9821e98a624179c0b81d2edc20186742f7.