Source code for cros.helpers.sysfs

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import os


def read_file(name):
    """ Returns the content of the file named 'name'."""
    fd = open(name, "r")
    contents = fd.read()
    fd.close()
    return contents


def sysfs_check_attributes_exists(s, path, name, files, check_devtype):
    """ Checks that all attributes listed in 'files' for a given 'path' exists.
        Note that the 'name' parameter is used to define a pattern to match
        before checking a device path.
    """
    match = 0
    try:
        for devname in os.listdir(path):
            if check_devtype:
                fd = open(os.path.join(path, devname, 'name'), "r")
                devtype = fd.read()
                fd.close()
                if not devtype.startswith(name):
                    continue
            else:
                if not devname.startswith(name):
                    continue
            match += 1
            for filename in files:
                p = os.path.join(path, devname, filename)
                s.assertTrue(os.path.exists(p), msg=f"{p} not found")
    except IOError as e:
        s.skipTest(f"{e}")
    if match == 0:
        s.skipTest(f"No {name} found")