[Android] Extract MD5sum logic.

build/android/pylib/utils/md5sum.py

Index: build/android/pylib/utils/md5sum.py
diff --git a/build/android/pylib/utils/md5sum.py b/build/android/pylib/utils/md5sum.py
new file mode 100644
index 0000000000000000000000000000000000000000..8c10bb0b88eb85d4e59a8832c5a22270b605b1b8
--- /dev/null
+++ b/build/android/pylib/utils/md5sum.py
@@ -0,0 +1,72 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import collections
+import logging
+import os
+import tempfile
+import types
+
+from pylib import cmd_helper
+from pylib import constants
+from pylib.utils import device_temp_file
+
+HashAndPath = collections.namedtuple('HashAndPath', ['hash', 'path'])
+
+MD5SUM_DEVICE_LIB_PATH = '/data/local/tmp/md5sum/'
+MD5SUM_DEVICE_BIN_PATH = MD5SUM_DEVICE_LIB_PATH + 'md5sum_bin'
+
+MD5SUM_DEVICE_SCRIPT_FORMAT = (
+    'test -f {path} -o -d {path} '
+    '&& LD_LIBRARY_PATH={md5sum_lib} {md5sum_bin} {path}')
+
+
+def CalculateHostMd5Sums(paths):
+  """Calculates the MD5 sum value for all items in |paths|.
+
+  Args:
+    paths: A list of host paths to md5sum.
+  Returns:
+    A list of named tuples with 'hash' and 'path' attributes.
+  """
+  if isinstance(paths, basestring):
+    paths = [paths]
+
+  out = cmd_helper.GetCmdOutput(
+      [os.path.join(constants.GetOutDirectory(), 'md5sum_bin_host')] +
+          [p for p in paths])
+  return [HashAndPath(*l.split(None, 1)) for l in out.splitlines()]
+
+
+def CalculateDeviceMd5Sums(paths, device):
+  """Calculates the MD5 sum value for all items in |paths|.
+
+  Args:
+    paths: A list of device paths to md5sum.
+  Returns:
+    A list of named tuples with 'hash' and 'path' attributes.
+  """
+  if isinstance(paths, basestring):
+    paths = [paths]
+
+  if not device.FileExists(MD5SUM_DEVICE_BIN_PATH):
+    device.adb.Push(
+        os.path.join(constants.GetOutDirectory(), 'md5sum_dist'),
+        MD5SUM_DEVICE_LIB_PATH)
+
+  out = []
+  with tempfile.NamedTemporaryFile() as md5sum_script_file:
+    with device_temp_file.DeviceTempFile(device) as md5sum_device_script_file:
+      md5sum_script = (
+          MD5SUM_DEVICE_SCRIPT_FORMAT.format(
+              path=p, md5sum_lib=MD5SUM_DEVICE_LIB_PATH,
+              md5sum_bin=MD5SUM_DEVICE_BIN_PATH)
+          for p in paths)
+      md5sum_script_file.write('; '.join(md5sum_script))
+      md5sum_script_file.flush()
+      device.adb.Push(md5sum_script_file.name, md5sum_device_script_file.name)
+      out = device.RunShellCommand(['sh', md5sum_device_script_file.name])
+
+  return [HashAndPath(*l.split(None, 1)) for l in out]
+