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…er volume os.replace cannot rename across volumes (EXDEV; WinError 17 on Windows), so an upload into an input/output folder on a different drive than the temp directory failed. On EXDEV, copy to a hidden staging file beside the destination and rename that into place, so a partial copy is never visible under the final name; the staging file is removed on any failure. The copy's own stat is recorded, since a copy can change the mtime.
…source shutil.copy2 also copies permission bits, which raises on filesystems that cannot store them (FAT/exFAT on Linux), failing the upload after the bytes were copied. Copy the bytes, then copy the mode best-effort. The copy's stat is what gets recorded, so check that the source still matches the stat hashing verified once the copy is done; otherwise bytes rewritten after hashing would be published under the old hash.
NTFS stores mtimes at 100 ns, so a sub-microsecond source mtime was truncated and a +1 ns rewrite left the mtime unchanged on Windows.
tempfile.mkstemp on Windows retries a PermissionError for as long as os.access reports the directory writable, which an ACL deny does not change, so an upload into a write-denied folder hung the server. Create the staging file directly with O_EXCL, retrying only on a name collision.
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Source excerpt: Treat `execution.py` as one example of this rule: it should consume the prompt graph and execution-relevant state, produce execution results and errors, and not know about workflow ids, frontend ids, persistence ids, or API-...📄 CodeRabbit inference engine (AGENTS.md) Files:
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📝 WalkthroughWalkthroughWhen Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to Cross-volume uploads can leave a truncated asset if copying is interrupted. That data-integrity risk should be explicitly accepted or fixed before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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🔍 Cursor Review — Consolidated panel
Triggered by @synap5e.
Found 5 finding(s).
| Severity | Count |
|---|---|
| 🟡 Medium | 1 |
| 🟢 Low | 3 |
| ⚪ Nit | 1 |
Panel: 8/8 reviewers contributed findings.
| with os.fdopen(fd, "wb") as dst, open(temp_path, "rb") as src: | ||
| shutil.copyfileobj(src, dst) | ||
| source_stat = os.fstat(src.fileno()) | ||
| if (source_stat.st_size, source_stat.st_mtime_ns) != ( |
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🟡 Medium — After the cross-device copy, the source is re-validated only by (st_size, st_mtime_ns) against the hash-time stat; mtime is trivially restorable via os.utime, so a concurrent in-place modification or file swap that preserves both fields publishes bytes that do not match the verified, hash-addressed name. The same-device path moves the exact hashed inode, so to keep an equivalent guarantee re-hash the staging copy (or hash the copied fd) rather than trusting size+mtime. Raised by 6 of 8 reviewers (gpt-5.6-sol-max adversarial, gpt-5.6-sol-max edge-case, kimi-k2.7-code adversarial, kimi-k2.7-code edge-case, gemini-3.1-pro adversarial, claude-opus-4-8-thinking-max adversarial).
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Rejected: this matches the trust model the rest of the catalogue uses. snapshot_hash itself accepts a file as unchanged on matching identity, size and mtime around the read, and the scanner relies on stored size+mtime. The same-volume path isn't stronger: an in-place rewrite of the hashed inode with mtime restored, between hashing and the rename, publishes the same way. Defeating it needs a second writer to the server's private temp/uploads/<random>/ file that deliberately restores mtime. Re-hashing would double the I/O of every cross-volume upload (multi-GB models) to close a window the same-volume path keeps.
| for _ in range(_STAGING_NAME_ATTEMPTS): | ||
| path = os.path.join(directory, f".{secrets.token_hex(8)}.upload.tmp") | ||
| try: | ||
| return os.open(path, flags, 0o666), path |
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🟢 Low — The staging file is created with mode 0o666, so under a permissive umask it is world-readable/writable in the destination directory while the copy runs, and if the best-effort shutil.copymode fails (its OSError is suppressed) those permissions persist on the published file. Create the staging file as 0o600 and let copymode widen it to the source's mode. Raised by 3 of 8 reviewers (gpt-5.6-sol-max adversarial, kimi-k2.7-code adversarial, claude-opus-4-8-thinking-max adversarial).
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Rejected: 0o666 filtered by the umask is how the temp upload itself is created (open(tmp_path, "wb") in upload.py), so the staging file gets the same mode the same-volume rename publishes. It's also how every other file ComfyUI writes is created. A permissive umask is the operator's choice. Starting at 0o600 would publish an owner-only file whenever copymode fails, which is the FAT/exFAT case where mode bits can't be set anyway.
| verified_stat.st_size, | ||
| verified_stat.st_mtime_ns, | ||
| ): | ||
| raise OSError("upload file changed after hashing") |
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🟢 Low — The mid-copy raise OSError("upload file changed after hashing") is caught by the outer except Exception and wrapped as RuntimeError, so this transient condition returns a generic 500 INTERNAL and is logged as an unexpected traceback instead of the UPLOAD_UNSTABLE result the identical hash-time instability produces. Raise the same instability exception the hash-time path uses so clients that retry on UPLOAD_UNSTABLE still retry and the error log stays clean. Raised by 2 of 8 reviewers (gpt-5.6-sol-max edge-case, claude-opus-4-8-thinking-max edge-case).
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Valid. Changes after hashing should surface the same way the hash-time check does (UploadUnstableError → UPLOAD_UNSTABLE), not as INTERNAL with a traceback. A small fix is proposed and will follow here once it's approved.
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| partial copy is never visible under the final name. The source must still | ||
| match the stat hashing verified once the copy is done. Returns the copy's | ||
| stat.""" | ||
| fd, staging = _create_staging_file(os.path.dirname(dest_abs)) |
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🟢 Low — The staging file .<hex>.upload.tmp is created in the destination directory and removed only by the in-process except block; if the process is killed between creation and os.replace (crash/OOM/power loss) it is orphaned there, and unlike temp_path nothing ever cleans it up (_remove_temp_path covers only the temp directory). Raised by 1 of 8 reviewers (claude-opus-4-8-thinking-max adversarial).
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Edited: declined rather than deferred; see the reply below.
A kill between creating the staging file and the rename can leave one hidden .<hex>.upload.tmp. The scanner never catalogues it (dotfile and partial-download extension), and the description lists it as known residue.
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The accepted residue finding needs a concrete resolution path before it can be deferred. Please either address cleanup in this PR, or link the owned issue/PR and give it a dated sunset before GA. “Tracked as a follow-up” without an artifact, owner, or date is not durable closure.
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Declining for this PR, by the maintainer's decision. This is an edge case: a single hidden staging file, never catalogued, left only after a hard kill mid-copy, like any partial write from a killed process. Handling it would add more complexity than its effect on correctness justifies. It's noted in the description as known residue.
| os.replace(staging, dest_abs) | ||
| except BaseException: | ||
| with contextlib.suppress(OSError): | ||
| os.remove(staging) |
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⚪ Nit — Two failure paths leak the staging file on Windows through the suppressed os.remove(staging): if os.fdopen(fd, ...) raises, fd is never closed (a descriptor leak everywhere, and an open handle blocks removal on Windows); and if the source is read-only, copymode makes the staging file read-only so os.remove cannot delete it. Raised by 1 of 8 reviewers (gemini-3.1-pro edge-case).
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Edited: superseded by e6563d5, which replaces the staging code with a plain copy; see Known limitations in the description.
Rejected: the source is always the server's own temp upload, created with open(..., "wb"), so it is never read-only and copymode can't make the staging file read-only. os.fdopen on a freshly opened descriptor with a fixed "wb" mode has no realistic failure path to guard.
…stable Raise UploadUnstableError, as the hash-time check does, so the API returns UPLOAD_UNSTABLE instead of a generic internal error.
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…cross-drive-upload
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How did this work prior to assets? Either this was already an issue or we used something like shutil to copy before and the agent switched it to 'optimize' (in which case we should just go back to the thing that worked rather than adding a bunch of complexity).
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Before assets, /upload/image wrote the multipart stream directly to the final path (server.py before 29b24cb51), so there was no cross-volume rename. Asset ingestion introduced a temp file plus os.replace in 29b24cb51, and the current hash-addressed path kept it through 19e1058f4.
shutil.move would make cross-volume uploads work, but its fallback copies directly under the final hash-derived name and then removes the source. That loses this path’s atomic-publication property: a concurrent scan or hard kill can expose a partial file under a name asserting the full content hash. Its copy2 fallback can also fail while copying metadata to FAT/exFAT. The staging sibling is the part that preserves the asset-ingest contract; the extra source stat check prevents publishing bytes that changed after hashing.
Same-volume uploads stay a single os.replace. On EXDEV, fall back to shutil.move and record the destination's stat, removing a truncated copy if the move fails. Drop the staging file, mode copy and source re-check along with their tests.
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The current cleanup can corrupt an existing asset on a failed cross-volume overwrite. shutil.move falls back to copy2(src, dest_abs), which opens the existing hash path for overwrite. If the disk fills after a partial write, dest_existed is true, so the exception path intentionally leaves those truncated bytes in place. The test only raises before touching the destination, so it misses this case. Please preserve or restore the prior file, or avoid copying directly over it.
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @app/assets/services/ingest.py:
- Line 206: Update the EXDEV fallback in the function containing shutil.move so
cross-filesystem copies do not write directly to dest_abs. Copy to a uniquely
named staging file beside dest_abs, then publish it with os.replace; remove the
staging file if copying or replacement fails, and preserve the existing
destination until publication succeeds.
- Line 206: Update the staging flow around shutil.move to keep the source
available until the cross-volume copy is complete, then compare its stat with
verified_stat before publication and raise UploadUnstableError if it changed.
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Source excerpt: Treat `execution.py` as one example of this rule: it should consume the prompt graph and execution-relevant state, produce execution results and errors, and not know about workflow ids, frontend ids, persistence ids, or API-...
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Copying straight onto the hash-named path overwrote an existing file in place, so a copy that failed partway (e.g. a full disk) left a good asset truncated. shutil.move into a uniquely named .part sibling and os.replace it into place, removing the .part on failure.
…copy On EXDEV, copy the upload into place with shutil.copyfile, skipping the copy when the hash-named file is already there at the same size, and record the stat of the file at the destination. Drop the staging file and its tests.
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Re your review: it wasn't a regression in the old path. |
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Re history and cleanup: e6563d5 replaces this with a plain copy. A same-size file already under the hash name is kept and never copied over, so a failed copy can't truncate an existing asset, and the cleanup path is gone. It uses |
… destination Keep an existing hash-named file only when its own hash matches the upload; otherwise remove the entry first, so the copy never writes through a link or over other bytes. Tests now pin the recorded mtime, the replacement of mismatched or truncated files, links, and non-EXDEV errors.
…volume copy Keep an existing hash-named file only when it is a regular, single-link file with matching bytes, so a symlink or hardlink left by a dedupe tool is replaced as a same-volume rename would. Remove the partial file if the copy fails, so a full disk doesn't stay full.
On EXDEV, copy the upload onto the hash-named path with shutil.copyfile and record the placed file's stat. Drop the content-hash keep check, the link checks and the partial-file cleanup; their cases are listed as known limitations on the PR.
…cross-drive-upload
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With assets enabled, uploads through the assets API are written to a temp file and renamed to their hash-named destination. That rename can't cross volumes, so an upload failed with "failed to move uploaded file into place" whenever the input or output folder was on a different drive or mount than ComfyUI's temp directory (
WinError 17on Windows,EXDEVon Linux/macOS). Now, when the rename fails withEXDEV, the file is copied onto its hash-named path withshutil.copyfile, and the recorded size and mtime are read from the placed file, since a copy has its own mtime. Same-drive uploads are unchanged, and the legacy/upload/imageendpoint, which writes straight to its final path, was never affected.Known limitations
A cross-drive upload is a plain copy onto the final path, not an atomic rename: