Comment-only pass over the Python this PR touches: drop what the code already
says, collapse multi-line explanations that still read on one line, and keep
the reasoning that is not recoverable from the code. No code, docstring
semantics or behaviour changes; verified with an AST comparison against the
previous revision, and the backend suite is unchanged (same 37 environment
failures as before: the API integration tests that need a live keyed server,
the flash-attn install hooks, and the GPU memory fields).
Gallery clear/delete now scope to Studio-owned files: image_gallery and
video_gallery skip PNGs / MP4s without a readable recipe (a hand-dropped or
orphan file the listing already hides), so clear() and a guessed-id delete no
longer destroy files the gallery never surfaced.
Remote ControlNets now force use_safetensors: a bare owner/name reaches
from_pretrained without the base trust gate, and the Hub scan fails open when
unavailable, so requiring safetensors closes the pickle deserialization vector.
POSIX uninstall now stops resident sd-server / sd-cli under an owned sd.cpp root
before removing the tree (marker-gated), mirroring the Windows stop-before-delete
scan; a live native server no longer survives unlinking its binary.
Diffusion dataset containment: the training-start read path and the discovery
picker route bare names through the protected resolver, so a symlinked dataset
is rejected / not advertised like the caption/delete routes already do. Uploads
gain the inference decode guard (oversized real images 400 before OOMing the
trainer) and dataset upload/caption/delete/import are blocked with 409 while a
diffusion run is active.
JSONL readers (trainer + routes) tolerate non-object JSON and invalid UTF-8
instead of raising AttributeError / 500.
LoRA family compatibility is enforced in the shared resolver, not only the
picker, so a direct API client cannot apply a mismatched-family adapter.
GPU arbiter gains release_if so the image/video unload idle-check and release
are atomic against a concurrent same-owner load's registration. Native batch
recipes persist the base batch_seed and restore replays from it, so a native
batch_index>0 image no longer advances its seed twice.
FLUX.2-klein selects its sd.cpp text encoder by variant (4B -> Qwen3-4B,
9B -> Qwen3-8B) instead of the single family default.
install_sd_cpp_prebuilt: only write the .unsloth-studio-owned marker when the
install created the target directory or it was empty. Adopting a pre-existing,
unowned, non-empty directory (a user's own stable-diffusion.cpp checkout) made
it eligible for the uninstaller's recursive delete.
routes/training upload: make the multi-file promotion transactional. Back up
each displaced original and roll every destination back on any failure, so a
mid-loop rename error can no longer partially overwrite the live dataset.
routes/training _resolve_dataset_folder: reject a symlinked dataset directory
and prove the resolved folder stays under the datasets root, so image
read/caption/delete cannot escape the root through a link.
routes/training delete: escape glob metacharacters in the thumbnail filename so
deleting an image named like [ab].png removes only its own thumbnails.
image_gallery / video_gallery listing: filter records against the response
schema inside the pager via a valid callback, so offset/limit/has_more all count
over accepted records. A leading schema-invalid record no longer returns an
empty page with has_more=true and stalls infinite scroll at offset 0.
image_gallery / video_gallery save: publish via a temp file plus atomic rename
(the sidecar is the video pair's commit marker) and clean up on failure, so a
partial write never surfaces a truncated PNG or strands an orphan MP4.
diffusion_train_common discovery: treat an empty caption sidecar as a metadata
tombstone that still falls through to the dreambooth instance prompt, so
clearing every metadata caption no longer fails with no captioned images found.
diffusion backend unload: wait for an in-flight denoise to exit before tearing
down process-wide patches and state, mirroring the load path.
diffusion_engine_router: serialize the whole check/unload/publish transition so
a concurrent selection cannot return the engine being unloaded.
uninstall.ps1: gate the default sd.cpp process stop on the owner marker so a
user's own sd-server is not terminated for a directory we then keep.
