irisandClaude Opus 5
3a74bd9c35
Reviewing the reattach code found the fault it exists to prevent, sitting in its own save point. `process::write` used `fs::write`, which truncates before it fills. A crash inside that window leaves no readable record -- and a missing record reads as "nothing is running", which is the single answer that makes the next launch start a *second* CLI against a conversation that already has one. The window is not rare: the record is rewritten on every read that makes progress, so many times a second while a turn is producing output. Written to a neighbouring file and renamed over the real name now. The rename is atomic, so a reader sees the whole old record or the whole new one. That also makes the fixed-size padding pointless -- a rename replaces the file rather than overwriting part of it -- so it goes. Two more from the same pass: - A failed read of the stdout log was logged and nothing else. The session then went deaf with nothing on screen: no more output, no error, a status that stayed wherever it was. It now says so, closes the queue rather than stranding messages in it, and reports `Unknown` -- not `Exited`, because the process may well still be running; what failed is this server's ability to hear it. - Sizing the stderr log by reading it. `read_from` with a large offset answers "how long is it" by allocating the whole file first, which on a chatty process is a large pointless read on every reattach. `size_of` asks the filesystem. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VETa8afmpWaYezLCqJhDB8