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#!/usr/bin/env python
"""
Usage:
./rtail.py user@host:path/foo.log bar.log host2:/path/baz.log
"""
import optparse
import os
import re
import select
import subprocess
import sys
import time
def main():
op = optparse.OptionParser()
options, args = op.parse_args()
streams = list()
for arg in args:
if re.match(r"^(.+@)?[a-zA-Z0-9.-]+:.+", arg):
# this is a remote location
hostname, path = arg.split(":", 1)
s = subprocess.Popen(["ssh", hostname, "tail -f " + path], stdout=subprocess.PIPE)
s.name = arg
streams.append(s)
else:
s = subprocess.Popen(["tail", "-f", arg], stdout=subprocess.PIPE)
s.name = arg
streams.append(s)
lastName = None
while True:
r, _, _ = select.select(
[stream.stdout.fileno() for stream in streams], [], [])
for fileno in r:
for stream in streams:
if stream.stdout.fileno() != fileno:
continue
data = os.read(fileno, 4096)
if not data:
streams.remove(stream)
break
if stream.name != lastName:
print "%s:" % stream.name
lastName = stream.name
sys.stdout.write(data)
break
if __name__ == "__main__":
main()
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