minions/bin/pfile

#!/usr/bin/python

import os
import subprocess
import sys
import tempfile

def stdin_chunk(chunksize):
    while True:
        chunk = sys.stdin.read(chunksize)
        if chunk:
            yield chunk
        else:
            break

if __name__ == '__main__':

    CHUNKSIZE = 8192

    tfile, tname = tempfile.mkstemp()

    for chunk in stdin_chunk(CHUNKSIZE):
        os.write(tfile, chunk)
    os.close(tfile)

    p = subprocess.Popen(["file", tname], stdout=subprocess.PIPE)
    stdout, stderr = p.communicate()
    os.unlink(tname)

    if stderr:
        sys.stderr.write(stderr)
        sys.exit(1)
    else:
        sys.stdout.write(stdout)