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/usr/share/ubuntu-drivers-common/detect/sl-modem.py is in ubuntu-drivers-common 1:0.2.91.4.

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# ubuntu-drivers-common custom detect plugin for sl-modem
#
# (C) 2012 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>

import re
import logging
import subprocess

modem_re = re.compile('^\s*\d+\s*\[Modem\s*\]')
modem_as_subdevice_re = re.compile('^card [0-9].*[mM]odem')

pkg = 'sl-modem-daemon'

def detect(apt_cache):
    # Check in /proc/asound/cards
    try:
        with open('/proc/asound/cards') as f:
            for l in f:
                if modem_re.match(l):
                    return [pkg]
    except IOError as e:
        logging.debug('could not open /proc/asound/cards: %s', e)

    # Check aplay -l
    try:
        aplay = subprocess.Popen(['aplay', '-l'], env={},
                stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                universal_newlines=True)
        (aplay_out, aplay_err) = aplay.communicate()

        if aplay.returncode != 0:
            logging.error('aplay -l failed with %i: %s' % (aplay.returncode,
                aplay_err))
            return None
    except OSError:
        logging.exception('could not open aplay -l')
        return None

    for row in aplay_out.splitlines():
        if modem_as_subdevice_re.match(row):
            return [pkg]

    return None