fix(msfs): prepend backend prefix to startAfter in GCS/AIStore listOb…

[joshuarobinson]

…jects

The GCS and AIStore listObjects implementations set the paging start-bound (StartOffset / StartAfter) to the raw prefix-relative startAfter key, while the query Prefix is prefixed with backend.prefix and returned object paths are stripped of backend.prefix. When a backend prefix is configured, the start bound was therefore compared against full (prefixed) object names using a prefix-relative key, so the filter was effectively ignored and pagination/resume was broken. This matches the S3 backend, which correctly uses backend.prefix + startAfter.

Found in merged MR !927.

Checklist

• Development PR
  • .release_notes/.unreleased.md
    • Notable changes to the client (i.e. not related to tooling, CI/CD, etc.) from this PR have been added.
• Release PR
  • CI/CD
    • The default branch pipelines are passing in both GitHub + GitLab (latter for SwiftStack E2E tests).
  • multi-storage-client/pyproject.toml
    • The package version has been bumped.
  • .release_notes/.unreleased.md
    • This file's contents have been moved into a .release_notes/{bumped package version}.md file.

Summary by CodeRabbit

• Bug Fixes
  • Corrected paginated object listings for AIStore and GCS-backed storage.
  • Listings now continue from the correct position when a storage path uses a configured prefix.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: 53649979-f50f-4a02-a017-42f3dd945c29

📥 Commits

Reviewing files that changed from the base of the PR and between b77536f and fbfe7f4.

📒 Files selected for processing (2)

• multi-storage-file-system/backend_aistore.go
• multi-storage-file-system/backend_gcs.go

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📝 Walkthrough

Walkthrough

AIStore and GCS object listing cursors now prepend each backend’s configured prefix to the provided startAfter value.

Changes

Prefix-aware object listing

Layer / File(s)	Summary
Backend listing cursor updates multi-storage-file-system/backend_aistore.go, multi-storage-file-system/backend_gcs.go	AIStore StartAfter and GCS StartOffset now combine the configured backend prefix with the supplied pagination cursor.

Estimated code review effort: 2 (Simple) | ~5 minutes

Suggested reviewers: ankitmaster08

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change to prepend the backend prefix for listObjects pagination.
Description check	✅ Passed	The description explains the change and includes the required checklist sections; only the task-ID line is omitted.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/mr927-liststartafter-backend-prefix

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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