tests/testlib/sigpipe-worker.py

deltas: add a debug-delta-find command to analyse delta search

See command documentation for details.

For some reason, pytype is confused by our usage of None/deltainfo variable, so
I had to quiet it.

#!/usr/bin/env python3
#
# This is literally `cat` but in python, one char at a time.
#
# see sigpipe-remote.py for details.

import io
import os
import sys


if isinstance(sys.stdout.buffer, io.BufferedWriter):
    print('SIGPIPE-WORKER: script need unbuffered output', file=sys.stderr)
    sys.exit(255)

while True:
    c = os.read(sys.stdin.fileno(), 1)
    os.write(sys.stdout.fileno(), c)