* Studio: clean up empty leftover quant folders so they can be deleted
An interrupted or cancelled split GGUF download leaves snapshots/<rev>/<quant>/
behind with no shards. Such a folder is neither a completed download nor a
tracked partial (no .incomplete blobs, no manifest), so it was invisible in the
variant list and a per-variant delete returned 404, leaving it on disk forever.
- list_empty_gguf_variant_dirs: detect quant folders that are empty in every
snapshot, excluding any quant that has shards in another snapshot.
- get_gguf_variants_response: surface those quants as partial (cleanable) so the
UI shows a delete affordance.
- _delete_gguf_variant_from_repos: remove the empty (or just-emptied) quant
subfolder and count it toward the result so the delete succeeds instead of 404.
Adds hub/tests/test_empty_variant_folder.py.
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Studio: simplify empty-dir check to any(iterdir())
* Studio: tighten comments on empty-quant-folder cleanup
* Studio: surface empty-folder removal failures and cleanables on local/offline paths
Address review feedback on the empty leftover quant folder cleanup:
- _remove_empty_variant_dirs now returns removal failures (read-only cache or a
locked dir), and the variant delete raises 409 instead of a misleading 404; a
concurrent download refilling the dir (ENOTEMPTY) is still treated as a skip.
- Empty leftover folders are surfaced as cleanable on every variant-listing path
(prefer_local_cache / offline / HF-fallback), not just a remote listing, via a
single post-process that flips a listed quant to partial or appends an
unlisted one.
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Studio: surface empty-folder cleanables even when metadata fetch fails
When the cache holds only an empty leftover snapshots/<rev>/<quant>/ folder
from an interrupted split download and the client is offline or the HF
metadata request fails, _compute() re-raised before cleanables were marked,
leaving the folder undeletable. Now fall back to marking cleanables against an
empty response and return them if any; otherwise re-raise the original error.
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
