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Device: Updated to set and retrieve binary data from sysfiles

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`set_sysfile_values` now accepts a `^` symbol prefixed to the
file path to indicated that the value should be written as binary data.
To accommodate this an extra `binary` flag has been added to  the `set_sysfile_value`and `get_sysfile_value` methods to write and retrieve the binary data respectively.
This commit is contained in:
Marc Bonnici
2017-04-04 17:32:10 +01:00
parent 35df2fff30
commit 50236b0661
2 changed files with 42 additions and 14 deletions
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49
wlauto/common/linux/device.py
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@@ -17,6 +17,7 @@
import os
import re
import time
import base64
import socket
from collections import namedtuple
from subprocess import CalledProcessError
@@ -241,7 +242,7 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
self.logger.debug('Could not pull property file "{}"'.format(propfile))
return {}
def get_sysfile_value(self, sysfile, kind=None):
def get_sysfile_value(self, sysfile, kind=None, binary=False):
"""
Get the contents of the specified sysfile.
@@ -251,28 +252,49 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
be any Python callable that takes a single str argument.
If not specified or is None, the contents will be returned
as a string.
:param binary: Whether the value should be encoded into base64 for reading
to deal with binary format.
"""
output = self.execute('cat \'{}\''.format(sysfile), as_root=self.is_rooted).strip() # pylint: disable=E1103
if binary:
output = self.execute('{} base64 {}'.format(self.busybox, sysfile), as_root=self.is_rooted).strip()
output = output.decode('base64')
else:
output = self.execute('cat \'{}\''.format(sysfile), as_root=self.is_rooted).strip() # pylint: disable=E1103
if kind:
return kind(output)
else:
return output
def set_sysfile_value(self, sysfile, value, verify=True):
def set_sysfile_value(self, sysfile, value, verify=True, binary=False):
"""
Set the value of the specified sysfile. By default, the value will be checked afterwards.
Can be overridden by setting ``verify`` parameter to ``False``.
Can be overridden by setting ``verify`` parameter to ``False``. By default binary values
will not be written correctly this can be changed by setting the ``binary`` parameter to
``True``.
"""
value = str(value)
self.execute('echo {} > \'{}\''.format(value, sysfile), check_exit_code=False, as_root=True)
if binary:
# Value is already string encoded, so need to decode before encoding in base64
try:
value = str(value.decode('string_escape'))
except ValueError as e:
msg = 'Can not interpret value "{}" for "{}": {}'
raise ValueError(msg.format(value, sysfile, e.message))
encoded_value = base64.b64encode(value)
cmd = 'echo {} | {} base64 -d > \'{}\''.format(encoded_value, self.busybox, sysfile)
else:
cmd = 'echo {} > \'{}\''.format(value, sysfile)
self.execute(cmd, check_exit_code=False, as_root=True)
if verify:
output = self.get_sysfile_value(sysfile)
output = self.get_sysfile_value(sysfile, binary=binary)
if output.strip() != value: # pylint: disable=E1103
message = 'Could not set the value of {} to {}'.format(sysfile, value)
raise DeviceError(message)
self._written_sysfiles.append(sysfile)
self._written_sysfiles.append((sysfile, binary))
def get_sysfile_values(self):
"""
@@ -281,21 +303,24 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
"""
values = {}
for sysfile in self._written_sysfiles:
values[sysfile] = self.get_sysfile_value(sysfile)
for sysfile, binary in self._written_sysfiles:
values[sysfile] = self.get_sysfile_value(sysfile, binary=binary)
return values
def set_sysfile_values(self, params):
"""
The plural version of ``set_sysfile_value``. Takes a single parameter which is a mapping of
file paths to values to be set. By default, every value written will be verified. The can
be disabled for individual paths by appending ``'!'`` to them.
file paths to values to be set. By default, every value written will be verified. This can
be disabled for individual paths by appending ``'!'`` to them. To enable values being
written as binary data, a ``'^'`` can be prefixed to the path.
"""
for sysfile, value in params.iteritems():
verify = not sysfile.endswith('!')
sysfile = sysfile.rstrip('!')
self.set_sysfile_value(sysfile, value, verify=verify)
binary = sysfile.startswith('^')
sysfile = sysfile.lstrip('^')
self.set_sysfile_value(sysfile, value, verify=verify, binary=binary)
def deploy_busybox(self, context, force=False):
"""