1 # Copyright 2016 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 from autotest_lib.client.common_lib import utils 6 7 8 def has_hal(hal_library_name, host=None, accept_64bit=True, accept_32bit=True): 9 """Detect if the host has the given HAL. 10 11 Note that a board can have several HALs, even of a same type. libhardware 12 picks among them at runtime based on values in system properties. So if 13 hal_library_name == 'gralloc', we might find that we have both 14 gralloc.brilloemulator.so and gralloc.default.so. This function will 15 not speculate about which will be loaded at runtime. 16 17 @param hal_library_name: string name of the hal (e.g. gralloc or camera). 18 @param host: optional host object representing a remote DUT. If None, 19 then we'll look for the HAL on localhost. 20 @param accept_64bit: True iff a 64 bit version of the library suffices. 21 @param accept_32bit: True iff a 32 bit version of the library suffices. 22 23 @return True iff an appropriate library is found on the device. 24 25 """ 26 run = utils.run if host is None else host.run 27 paths = [] 28 if accept_64bit: 29 paths.append('/system/lib64/hw') 30 if accept_32bit: 31 paths.append('/system/lib/hw') 32 for path in paths: 33 result = run('find %s -name %s.*.so 2>/dev/null' % 34 (path, hal_library_name), ignore_status=True) 35 if result.exit_status == 0 and result.stdout.strip(): 36 return True 37 38 return False 39
