Recover publication after object storage acknowledges late
The object store commits an archive but the upload times out; retry creates a differently named duplicate and publishes only one metadata set.
- Focused work estimate
- 6h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Object storage · Idempotency · Integrity
Estimated field mix
- DevOps70%
- Storage systems30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional command-line product publishes local package archives. Builds contain timestamps, checksums are copied without provenance, and cleanup can delete the only rollback artifact. Use generated source trees, ephemeral development signing keys, and local object storage; no public registry or production key is supplied.
Setup prerequisites
- Content hashing
- Archive formats
- Release metadata
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- DART-101 · Make archive bytes reproducible from the same source manifest
- DART-102 · Generate a dependency inventory from resolved inputs
- DART-103 · Bind provenance to source, builder, and exact artifact
- DART-104 · Keep signing keys outside the build workspace
- DART-105 · Promote only artifacts whose evidence set reconciles
- DART-106 · Prevent a mutable channel from changing an approved artifact
- DART-108 · Retain rollback artifacts while bounding storage growth
Acceptance criteria
- Object key derives from verified content digest
- Retry reconciles size, digest, and metadata before upload
- Conflicting existing content is quarantined and never overwritten
Implementation constraints
- Treat storage metadata as untrusted until content identity is verified.
Verification to include
- Upload and replay an identical artifact idempotently.
- Lose the response after commit and preplace conflicting bytes under the expected key.
Deliverables
- Content-addressed publisher and ambiguous-upload tests
Rollout and recovery
Enable for one artifact class while retaining the prior publisher for rollback.
Value of the work
For the engineer: Practice reproducible artifacts, provenance validation, signing-key isolation and retention safety.
For the team: Review a supply path that can trace, verify, retain, and revoke artifacts without relying on mutable names.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.