Piping logs/JSON to a consumer that exits triggers `Broken pipe` and CLI panic

[burakdede]

Piping logs/JSON to a consumer that exits triggers Broken pipe and CLI panic.

Repro

• tower apps logs <app>#<run> | head -n 1
• tower apps show --json | head -n 1

Expected

• CLI exits cleanly (exit code 0), no panic.

Actual

• CLI panics on Broken pipe.

Sample reproducible job

• tower run --dir tower-examples/pressure-logs -p LINES=5000 -p LINE_BYTES=200 --detached
• wait a few seconds
• tower apps logs pressure-logs#<run> | head -n 1

Sample script

import json
import os
import sys

def to_int(value, name):
    try:
        return int(value)
    except ValueError:
        print(f"Invalid integer for {name}: {value}")
        sys.exit(2)

def main():
    lines = to_int(os.environ.get("LINES", "0"), "LINES")
    line_bytes = to_int(os.environ.get("LINE_BYTES", "0"), "LINE_BYTES")
    payload = "x" * max(0, line_bytes - 80)
    for idx in range(1, lines + 1):
        record = {"seq": idx, "payload": payload}
        print(json.dumps(record, separators=(",", ":")))
    print("LOG_DONE")

if __name__ == "__main__":
    main()

Sample output

`thread 'main' panicked at crates/tower-cmd/src/output.rs:213:48:`
`called Result::unwrap() on an Err value: Os { code: 32, kind: BrokenPipe, ... }`