Add a snapshot of flutter/engine/src/build to our sdk

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..3e61c8facb14f806ec4b4c29f5eb88f084672949
--- /dev/null
+++ b/build/android/pylib/utils/md5sum.py
@@ -0,0 +1,91 @@
+# 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 re
+import tempfile
+import types
+
+from pylib import cmd_helper
+from pylib import constants
+from pylib.utils import device_temp_file
+
+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}')
+
+_STARTS_WITH_CHECKSUM_RE = re.compile(r'^\s*[0-9a-fA-F]{32}\s+')
+
+
+def CalculateHostMd5Sums(paths):
+  """Calculates the MD5 sum value for all items in |paths|.
+
+  Directories are traversed recursively and the MD5 sum of each file found is
+  reported in the result.
+
+  Args:
+    paths: A list of host paths to md5sum.
+  Returns:
+    A dict mapping file paths to their respective md5sum checksums.
+  """
+  if isinstance(paths, basestring):
+    paths = [paths]
+
+  md5sum_bin_host_path = os.path.join(
+      constants.GetOutDirectory(), 'md5sum_bin_host')
+  if not os.path.exists(md5sum_bin_host_path):
+    raise IOError('File not built: %s' % md5sum_bin_host_path)
+  out = cmd_helper.GetCmdOutput([md5sum_bin_host_path] + [p for p in paths])
+
+  return _ParseMd5SumOutput(out.splitlines())
+
+
+def CalculateDeviceMd5Sums(paths, device):
+  """Calculates the MD5 sum value for all items in |paths|.
+
+  Directories are traversed recursively and the MD5 sum of each file found is
+  reported in the result.
+
+  Args:
+    paths: A list of device paths to md5sum.
+  Returns:
+    A dict mapping file paths to their respective md5sum checksums.
+  """
+  if isinstance(paths, basestring):
+    paths = [paths]
+
+  if not device.FileExists(MD5SUM_DEVICE_BIN_PATH):
+    md5sum_dist_path = os.path.join(constants.GetOutDirectory(), 'md5sum_dist')
+    if not os.path.exists(md5sum_dist_path):
+      raise IOError('File not built: %s' % md5sum_dist_path)
+    device.adb.Push(md5sum_dist_path, MD5SUM_DEVICE_LIB_PATH)
+
+  out = []
+
+  with tempfile.NamedTemporaryFile() as md5sum_script_file:
+    with device_temp_file.DeviceTempFile(
+        device.adb) 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 _ParseMd5SumOutput(out)
+
+
+def _ParseMd5SumOutput(out):
+  hash_and_path = (l.split(None, 1) for l in out
+                   if l and _STARTS_WITH_CHECKSUM_RE.match(l))
+  return dict((p, h) for h, p in hash_and_path)
+