Serialize image service pulls

[jakduch]

Starting all generated image services asynchronously lets multiple Podman processes mutate the same containers/storage concurrently. This has produced reproducible overlay-layer unpack and rename failures in separate CI runs.

Wait for each image service before starting the next one. The pull remains idempotent and the existing always block still removes the temporary policy drop-ins on failure.

Tests:

• ANSIBLE_LOCAL_TEMP=/private/tmp/ansible-local-foremanctl-recovery ansible-lint --offline src/roles/images/tasks/pull.yaml
• git diff --check

Fixes #881

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Review configuration:

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 6fa72584-fffb-45d1-8549-f7ea5b52c73b

📥 Commits

Reviewing files that changed from the base of the PR and between 63713ae and 02e001e.

📒 Files selected for processing (4)

• src/roles/images/defaults/main.yaml
• src/roles/images/tasks/deploy_image.yaml
• src/roles/images/tasks/pull.yaml
• tests/images_test.py

📝 Walkthrough

Walkthrough

Image service restarts now run serially and block until each restart completes. The playbook no longer registers asynchronous jobs or polls for their completion.

Changes

Image service restarts

Layer / File(s)	Summary
Blocking serial restarts src/roles/images/tasks/pull.yaml	Image service restarts run serially and block for completion. Asynchronous execution and completion polling are removed.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: archanaserver

Merge Risk: 🟡 Moderate · up to 63713

A stalled image pull can halt deployment before later images are pulled and leave temporary policy drop-ins in place. Restore a deadline that also stops the underlying pull before merging.

Architecture Summary

Architecture risk: 🔵 Low · up to 63713

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — src (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in src/roles/images/tasks/pull.yaml: Image service restarts now run serially and block for completion. The previous asynchronous execution and registered job results, followed by polling each job for up to 120 retries at 5-second intervals, were removed.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: serializing image service pulls.
Description check	✅ Passed	The description directly explains the concurrency issue, the serialization fix, preserved cleanup behavior, and validation performed.
Linked Issues check	✅ Passed	The change satisfies issue #881. The image-service task now uses a blocking ansible.builtin.systemd operation in a loop. Ansible processes loop items sequentially because the task no longer uses `as…
Out of Scope Changes check	✅ Passed	The diff changes only src/roles/images/tasks/pull.yaml. It replaces asynchronous image pulls and their completion polling with serial execution. This directly implements issue #881. No unrelated beh…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In @src/roles/images/tasks/pull.yaml:
- Line 29: Update the “Pull images serially via image services” task to enforce
a deadline for each pull: use Ansible async with a positive poll value, bound
the underlying systemd/Quadlet image service so it cannot outlive that deadline,
and wait for the service to finish before starting the next pull.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 0edde92f-c80f-4878-9b2e-7b2e1eebb6dc

📥 Commits

Reviewing files that changed from the base of the PR and between 6c79648 and 63713ae.

📒 Files selected for processing (1)

• src/roles/images/tasks/pull.yaml

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[jakduch]

The completed run has no image-pull regression. The two matrix failures are the same hourly timer race when the timer auto-fired around 20:00 UTC: FIPS Stream 10 and external DB Stream 10. The third failed Test suite job is only the aggregate gate.

Tracked in #887 and fixed separately in #888 at e15f3d2.