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[GH-ISSUE #4574] [Bug] push-adb-file pushes without overwrite after an ambiguous existence-probe failure #2376
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opened 2026-10-17 21:03:53 +00:00 by bsakaguchi
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Originally created by @coygeek on GitHub (Oct 16, 2026).
Original GitHub issue: https://github.com/morluto/rea/issues/4574
Before submitting
Area
Other
Observed behavior
Running
node scripts/rea.mjs push-adb-file emulator-5554 <local-file> /sdcard/rea-repro/payload.bin --jsonwithout--overwriteissued an adb push after the pre-pushtest -ecommand exited 1 with stderradb: error: closed. REA exited 0, recordedparameters.overwrite: false, and reportednormalized_result.overwritten: false. The fake adb copied the replacement bytes over its preexisting local device-file stand-in. A successful path-exists probe instead refused the same request and left the stand-in unchanged.This was observed through the built public CLI with a deterministic fake adb selected using the documented
REA_ADB_PATH. No Android device was attached; the observed replacement occurred only in the fixture. A real connection failure and actual device-file loss were not reproduced.Reproduction
npm ciandnpm run build:cachedin a fresh checkout. For the published-package baseline, install the release listed below withnpm install --prefix <release-dir> rea-agents@<release-version>; its package root is<release-dir>/node_modules/rea-agents. Both preparations and builds were executed with a disposable HOME and npm cache.reproduce.py. From each baseline's root, runpython3 <path-to-reproduce.py>with the Node runtime listed below on PATH. It creates an isolated HOME, removes client-config overrides, supplies a small fake adb, and deletes its temporary files on completion. It never contacts an Android device.overwrite: false, replace the stand-in bytes, and reportoverwritten: false. The existence and offline controls refuse without pushing; the clean absent-destination control exits its probe nonzero with no adb diagnosis, then succeeds without overwrite, receives the selected bytes, and reportsoverwritten: false. Explicit overwrite permits replacement. This fixture makes six CLI requests per baseline; the ambiguous cases reproduced 2/2 on each tested build (4/4 across both builds).Expected behavior
Without explicit overwrite, an ambiguous pre-push probe must leave destination existence unknown and stop before transfer. REA must return a typed failure retaining the probe diagnostic instead of treating that failure as evidence that the destination is absent. The documentation promises an existing-target check and refusal without overwrite, and the provider's probe comment explicitly says other failures leave existence unknown and must not be followed by push. The documented non-atomic check caveat concerns concurrent creation after the check; this fixture has no competing process or destination creation.
Impact and scope
The observed defect bypasses overwrite refusal for an unrecognized nonzero probe diagnostic and returns an inaccurate replacement receipt. The deterministic fixture reproduced the erroneous transfer in both attempts on each tested build. Real-device frequency, affected destination contents, and severe loss of valuable data were not measured; actual device replacement remains an inference from issuing adb push to an existing selected path.
REA version
Current-main source commit
f22e8e7268, built from a fresh clone; separately installed npm releaserea-agents@6.5.0, confirmed as the latest published version by the registry. Both CLI entry points report6.5.0.Runtime and platform
Node.js v24.18.0; npm 11.16.0 (the source checkout's pinned development toolchain); macOS 27.0.1;
uname -sm: Darwin arm64. The fake adb reports Android Debug Bridge 1.0.41 and version 34.0.5-10900879; this is fixture identity, not an installed platform-tools observation.Target and artifact context
Selected synthetic serial
emulator-5554, absolute destination/sdcard/rea-repro/payload.bin, local input containingreplacement bytesfollowed by a newline, and a local destination stand-in containingoriginal device bytesfollowed by a newline except in the absent-destination control, which removes the stand-in before invocation. The fake adb records commands, implements the specified probe outcomes, copies the actual private input snapshot on push, and computes SHA-256 over the copied bytes. No live Android filesystem or emulator was used.Interface
CLI
Earliest failure stage
Capture or observation
Relevant output or evidence
node scripts/rea.mjs push-adb-file --help.Executed identity and entry-point checks:
Executed
python3 <path-to-reproduce.py>from each baseline's root; both produced this exact meaningful output:The fixture's invocation log established that the ambiguous cases ran
version,shell test -e,push, andshell sha256sumin that order. The absent-destination control also ranversion,shell test -e,push, andshell sha256sum, created the stand-in with the selected bytes, and reportedoverwritten: false. Successful-existence and offline controls ran onlyversionandshell test -e. The fixture supplies the ambiguous stderr diagnostic rather than assuming it from REA's final output.Typed outcome or recovery expected
Repeat the same ambiguous-probe request without overwrite: the current failure is exit 0 plus a push and false replacement receipt; the passing restoration is a nonzero typed refusal preserving unknown destination existence and the probe diagnosis, with no push and the original stand-in bytes intact. Keep the successful-existence control refused, the recognized offline control refused, the clean absent-destination control successful without
--overwriteafter a nonzero probe with no adb diagnosis, with the destination receiving the selected bytes andoverwritten: false, and the explicit-overwrite control successful withoverwritten: true. Those controls distinguish protecting unknown existence from disabling all transfers.Analysis or suspected cause
Source-derived reasoning: the shared adb runner represents an unrecognized failed probe as a protocol error. The push workflow lets that error continue, derives the existence flag from probe success, and therefore treats it as false. The same flag controls both overwrite refusal and the replacement receipt. This explains the observed transfer and receipt without requiring a race.
Additional context
This is a focused follow-up to merged PR #2354: it fixed recognized offline/unauthorized/missing-device probes and explicitly left unclassified nonzero probes with stderr for a separate decision. The current provider comment still promises to preserve unknown existence rather than push. Open-and-closed issue/PR searches for
push-adb-file,push_adb_file,test -e, andoverwrittenfound no focused duplicate or pending fix. Related #4252 concerns host-source bytes changing between digest and transfer; #3369 concerns post-push checksum overflow; #2602 concerns tool-description wording. The broaderoverwritesearch reached its result limit and later narrowing queries hit GitHub's search rate limit; the completed command-name searches each returned 11 results across both states. No live-device check was performed.@coygeek commented on GitHub (Oct 18, 2026):
Addressed on main in
github.com/morluto/rea@61e688070f. The destination check now treats only a clean, completedtest -efalse result as absence; ambiguous results such asadb: error: closedretain their diagnostic and stop beforeadb push. Main also includes CLI regression coverage that checks the destination remains unchanged. Verified by source review; I have not rerun the fixture or tested a live device. Closing as completed.