client: Add udevadm helpers module
Add a couple of wrapper classes around udevadm info and trigger.
BUG=b:157577850
TEST=Ran bluetooth_AdapterSRSanity a few times
Change-Id: I8aa5395a1df98e3405e0e455e7be84ff66091278
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2262281
Tested-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Daniel Winkler <danielwinkler@google.com>
Reviewed-by: Shijin Abraham <shijinabraham@google.com>
Commit-Queue: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
diff --git a/client/cros/udev_helpers.py b/client/cros/udev_helpers.py
new file mode 100644
index 0000000..5da9d51
--- /dev/null
+++ b/client/cros/udev_helpers.py
@@ -0,0 +1,92 @@
+# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+# Lint as: python3
+""" Udevadm helper classes and functions.
+"""
+
+import subprocess
+
+class UdevadmInfo():
+ """ Use udevadm info on a specific path.
+ """
+
+ @classmethod
+ def GetProperties(cls, syspath):
+ """ Get all properties of given syspath as a dict.
+
+ Args:
+ syspath: System path to get properties for.
+
+ Returns:
+ Dict with attribute/property as key and it's value. All keys are
+ converted to lowercase. Example: {'subsystem': 'input'}
+ """
+ props = {}
+ rawprops = subprocess.check_output(' '.join(
+ ['udevadm', 'info', '-q', 'property', '-p', syspath]),
+ shell=True)
+
+ for line in rawprops.splitlines():
+ upper_key, value = line.split('=', 1)
+ props[upper_key.lower()] = value.strip('"')
+
+ return props
+
+class UdevadmTrigger():
+ """ Use udevadm trigger with specific rules.
+ """
+
+ def __init__(self,
+ verbose=True,
+ event_type=None,
+ attr_match=[],
+ attr_nomatch=[],
+ subsystem_match=[],
+ subsystem_nomatch=[]):
+ """ Constructor
+
+ Args:
+ verbose: Whether to output triggered syspaths
+ event_type: What type of events to trigger (device or subsystem)
+ attr_match: What attributes to match
+ attr_nomatch: What attributes not to match
+ subsystem_match: What subsystems to match
+ subsystem_nomatch: What subsystems not to match
+ """
+ cmd = ['udevadm', 'trigger']
+
+ if verbose:
+ cmd.append('-v')
+
+ if event_type:
+ cmd.append('-t')
+ cmd.append('"{}"'.format(event_type))
+
+ for attr in attr_match:
+ cmd.append('-a')
+ cmd.append('"{}"'.format(attr))
+
+ for attr in attr_nomatch:
+ cmd.append('-A')
+ cmd.append('"{}"'.format(attr))
+
+ for subsystem in subsystem_match:
+ cmd.append('-s')
+ cmd.append('"{}"'.format(subsystem))
+
+ for subsystem in subsystem_nomatch:
+ cmd.append('-S')
+ cmd.append('"{}"'.format(subsystem))
+
+ self.cmd = cmd
+
+ def DryRun(self):
+ """ Do a dry run using initialized trigger rules.
+
+ Returns:
+ List of syspaths that would be triggered.
+ """
+ cmd = self.cmd + ['-n']
+ lines = subprocess.check_output(' '.join(cmd), shell=True)
+ return lines.splitlines() if lines else []
