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Side by Side Diff: build/android/pylib/utils/device_temp_file.py

Issue 2101243005: Add a snapshot of flutter/engine/src/build to our sdk (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: add README.dart Created 4 years, 5 months ago
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1 # Copyright 2013 The Chromium 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 """A temp file that automatically gets pushed and deleted from a device."""
6
7 # pylint: disable=W0622
8
9 import random
10 import time
11
12 from pylib import cmd_helper
13 from pylib.device import device_errors
14
15
16 class DeviceTempFile(object):
17 def __init__(self, adb, suffix='', prefix='temp_file', dir='/data/local/tmp'):
18 """Find an unused temporary file path in the devices external directory.
19
20 When this object is closed, the file will be deleted on the device.
21
22 Args:
23 adb: An instance of AdbWrapper
24 suffix: The suffix of the name of the temp file.
25 prefix: The prefix of the name of the temp file.
26 dir: The directory on the device where to place the temp file.
27 """
28 self._adb = adb
29 # make sure that the temp dir is writable
30 self._adb.Shell('test -d %s' % cmd_helper.SingleQuote(dir))
31 while True:
32 self.name = '{dir}/{prefix}-{time:d}-{nonce:d}{suffix}'.format(
33 dir=dir, prefix=prefix, time=int(time.time()),
34 nonce=random.randint(0, 1000000), suffix=suffix)
35 self.name_quoted = cmd_helper.SingleQuote(self.name)
36 try:
37 self._adb.Shell('test -e %s' % self.name_quoted)
38 except device_errors.AdbCommandFailedError:
39 break # file does not exist
40
41 # Immediately touch the file, so other temp files can't get the same name.
42 self._adb.Shell('touch %s' % self.name_quoted)
43
44 def close(self):
45 """Deletes the temporary file from the device."""
46 # ignore exception if the file is already gone.
47 try:
48 self._adb.Shell('rm -f %s' % self.name_quoted)
49 except device_errors.AdbCommandFailedError:
50 # file does not exist on Android version without 'rm -f' support (ICS)
51 pass
52
53 def __enter__(self):
54 return self
55
56 def __exit__(self, type, value, traceback):
57 self.close()
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