{"record":{"id":"e047897968cce376","repo":"Hmbown/CodeWhale","slug":"tmux-attach-failed-s-command-was-attach","errorCode":null,"errorMessage":"tmux attach failed ({s}); command was: {attach}","messagePattern":"tmux attach failed \\((.+?)\\); command was: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/cli/src/lib.rs","lineNumber":976,"sourceCode":"                );\n            };\n            if print {\n                println!(\"{attach}\");\n                return Ok(());\n            }\n            if let Some(session) = lane.tmux_session.as_deref() {\n                let socket = lane\n                    .tmux_socket\n                    .as_deref()\n                    .context(\"tmux lane is missing its pinned server socket\")?;\n                let status = Command::new(\"tmux\")\n                    .arg(\"-S\")\n                    .arg(socket)\n                    .args([\"attach\", \"-t\", session])\n                    .status();\n                match status {\n                    Ok(s) if s.success() => Ok(()),\n                    Ok(s) => bail!(\"tmux attach failed ({s}); command was: {attach}\"),\n                    Err(err) => {\n                        eprintln!(\"could not exec tmux: {err}\");\n                        println!(\"{attach}\");\n                        bail!(\"tmux attach unavailable\");\n                    }\n                }\n            } else {\n                println!(\"{attach}\");\n                Ok(())\n            }\n        }\n        LaneCommand::Logs {\n            lane_id,\n            follow,\n            tail,\n        } => {\n            let reg = LaneRegistry::open_default()?;\n            let lane = reg.load(&lane_id)?;","sourceCodeStart":958,"sourceCodeEnd":994,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/73e0f67d83c59909b571efdfc88c4bc28c309cb1/crates/cli/src/lib.rs#L958-L994","documentation":"The tmux attach backend spawned the attach command (`tmux -S <socket> attach -t <session>`) and the process ran but exited nonzero (`s.success()` false). The error includes the exit status and the exact command, so the user can retry it manually. This means tmux itself rejected or aborted the attach, not that tmux was missing.","triggerScenarios":"`tmux attach` exits nonzero — session terminated while attaching, tmux server error, terminal not compatible, or the session died between resolution and attach (race after error 457's check).","commonSituations":"Attaching from a terminal tmux can't use (non-TTY, nested tmux with odd settings); session killed concurrently; tmux socket permission issues causing server errors; running the command in CI where no TTY exists.","solutions":["Copy the `command was:` portion of the message and run it manually in an interactive terminal to see tmux's real error.","Ensure you run the attach from an interactive TTY (not CI or a piped terminal).","Verify the tmux session still exists (`tmux -S <socket> ls`) and restart the lane if it vanished.","If nested, try `tmux attach -t <session> -d` or detach the outer session first."],"exampleFix":"// before: exits with 'tmux attach failed (exit status 1)'\nci-run: codewhale lane attach lane-1\n// after: attach only from an interactive terminal\nterminal$ codewhale lane attach lane-1","handlingStrategy":"try-catch","validationCode":"await exec(`tmux -S ${socket} has -t ${session}`); // ensure session exists and tmux works before attach","typeGuard":null,"tryCatchPattern":"try { attachLane(id); }\ncatch (e) {\n  const m = /command was: (.+)$/.exec(e.message);\n  if (m) console.error('retry manually:', m[1]);\n}","preventionTips":["Attach only from an interactive TTY.","Pre-check the tmux session with `tmux ls`.","Parse the 'command was:' suffix to recover the manual command."],"tags":["tmux","attach","terminal","lane"],"backgroundTag":"command-not-found","analyzedSha":"73e0f67d83c59909b571efdfc88c4bc28c309cb1","analyzedAt":"2026-09-22T01:30:00.501Z","contentChangedAt":"2026-09-22T01:30:00.501Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}