Function _syscmd_file

Lib/platform.py:670–702

Interface to the system's file command. The function uses the -b option of the file command to have it omit the filename in its output. Follow the symlinks. It returns default in case the command should fail.

(target, default='')

def _syscmd_file(target, default=''):

    """ Interface to the system's file command.

        The function uses the -b option of the file command to have it
        omit the filename in its output. Follow the symlinks. It returns
        default in case the command should fail.

    """
    if sys.platform in {'dos', 'win32', 'win16', 'ios', 'tvos', 'watchos'}:
        # XXX Others too ?
        return default

    try:
        import subprocess
    except ImportError:
        return default
    target = _follow_symlinks(target)
    # "file" output is locale dependent: force the usage of the C locale
    # to get deterministic behavior.
    env = dict(os.environ, LC_ALL='C')
    try:
        # -b: do not prepend filenames to output lines (brief mode)
        output = subprocess.check_output(['file', '-b', target],
                                         stderr=subprocess.DEVNULL,
                                         env=env)
    except (OSError, subprocess.CalledProcessError):
        return default
    if not output:
        return default
    # With the C locale, the output should be mostly ASCII-compatible.
    # Decode from Latin-1 to prevent Unicode decode error.
    return output.decode('latin-1')

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