Remove dependency of gsutil to download ndk

platform_tools/android/bin/download_utils.py

Index: platform_tools/android/bin/download_utils.py
diff --git a/platform_tools/android/bin/download_utils.py b/platform_tools/android/bin/download_utils.py
new file mode 100755
index 0000000000000000000000000000000000000000..298ba9a863aa8c68badb2ab8a1fe0d3ce8c955a0
--- /dev/null
+++ b/platform_tools/android/bin/download_utils.py
@@ -0,0 +1,323 @@
+#!/usr/bin/python
+# Copyright (c) 2012 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""A library to assist automatically downloading files.
+
+This library is used by scripts that download tarballs, zipfiles, etc. as part
+of the build process.
+"""
+
+import hashlib
+import http_download
+import os.path
+import re
+import shutil
+import sys
+import time
+import urllib2
+
+SOURCE_STAMP = 'SOURCE_URL'
+HASH_STAMP = 'SOURCE_SHA1'
+
+
+# Designed to handle more general inputs than sys.platform because the platform
+# name may come from the command line.
+PLATFORM_COLLAPSE = {
+    'windows': 'windows',
+    'win32': 'windows',
+    'cygwin': 'windows',
+    'linux': 'linux',
+    'linux2': 'linux',
+    'linux3': 'linux',
+    'darwin': 'mac',
+    'mac': 'mac',
+}
+
+ARCH_COLLAPSE = {
+    'i386'  : 'x86',
+    'i686'  : 'x86',
+    'x86_64': 'x86',
+    'armv7l': 'arm',
+}
+
+
+class HashError(Exception):
+  def __init__(self, download_url, expected_hash, actual_hash):
+    self.download_url = download_url
+    self.expected_hash = expected_hash
+    self.actual_hash = actual_hash
+
+  def __str__(self):
+    return 'Got hash "%s" but expected hash "%s" for "%s"' % (
+        self.actual_hash, self.expected_hash, self.download_url)
+
+
+def PlatformName(name=None):
+  if name is None:
+    name = sys.platform
+  return PLATFORM_COLLAPSE[name]
+
+def ArchName(name=None):
+  if name is None:
+    if PlatformName() == 'windows':
+      # TODO(pdox): Figure out how to auto-detect 32-bit vs 64-bit Windows.
+      name = 'i386'
+    else:
+      import platform
+      name = platform.machine()
+  return ARCH_COLLAPSE[name]
+
+def EnsureFileCanBeWritten(filename):
+  directory = os.path.dirname(filename)
+  if not os.path.exists(directory):
+    os.makedirs(directory)
+
+
+def WriteData(filename, data):
+  EnsureFileCanBeWritten(filename)
+  f = open(filename, 'wb')
+  f.write(data)
+  f.close()
+
+
+def WriteDataFromStream(filename, stream, chunk_size, verbose=True):
+  EnsureFileCanBeWritten(filename)
+  dst = open(filename, 'wb')
+  try:
+    while True:
+      data = stream.read(chunk_size)
+      if len(data) == 0:
+        break
+      dst.write(data)
+      if verbose:
+        # Indicate that we're still writing.
+        sys.stdout.write('.')
+        sys.stdout.flush()
+  finally:
+    if verbose:
+      sys.stdout.write('\n')
+    dst.close()
+
+
+def DoesStampMatch(stampfile, expected, index):
+  try:
+    f = open(stampfile, 'r')
+    stamp = f.read()
+    f.close()
+    if stamp.split('\n')[index] == expected:
+      return "already up-to-date."
+    elif stamp.startswith('manual'):
+      return "manual override."
+    return False
+  except IOError:
+    return False
+
+
+def WriteStamp(stampfile, data):
+  EnsureFileCanBeWritten(stampfile)
+  f = open(stampfile, 'w')
+  f.write(data)
+  f.close()
+
+
+def StampIsCurrent(path, stamp_name, stamp_contents, min_time=None, index=0):
+  stampfile = os.path.join(path, stamp_name)
+
+  # Check if the stampfile is older than the minimum last mod time
+  if min_time:
+    try:
+      stamp_time = os.stat(stampfile).st_mtime
+      if stamp_time <= min_time:
+        return False
+    except OSError:
+      return False
+
+  return DoesStampMatch(stampfile, stamp_contents, index)
+
+
+def WriteSourceStamp(path, url):
+  stampfile = os.path.join(path, SOURCE_STAMP)
+  WriteStamp(stampfile, url)
+
+def WriteHashStamp(path, hash_val):
+  hash_stampfile = os.path.join(path, HASH_STAMP)
+  WriteStamp(hash_stampfile, hash_val)
+
+
+def Retry(op, *args):
+  # Windows seems to be prone to having commands that delete files or
+  # directories fail.  We currently do not have a complete understanding why,
+  # and as a workaround we simply retry the command a few times.
+  # It appears that file locks are hanging around longer than they should.  This
+  # may be a secondary effect of processes hanging around longer than they
+  # should.  This may be because when we kill a browser sel_ldr does not exit
+  # immediately, etc.
+  # Virus checkers can also accidently prevent files from being deleted, but
+  # that shouldn't be a problem on the bots.
+  if sys.platform in ('win32', 'cygwin'):
+    count = 0
+    while True:
+      try:
+        op(*args)
+        break
+      except Exception:
+        sys.stdout.write("FAILED: %s %s\n" % (op.__name__, repr(args)))
+        count += 1
+        if count < 5:
+          sys.stdout.write("RETRY: %s %s\n" % (op.__name__, repr(args)))
+          time.sleep(pow(2, count))
+        else:
+          # Don't mask the exception.
+          raise
+  else:
+    op(*args)
+
+
+def MoveDirCleanly(src, dst):
+  RemoveDir(dst)
+  MoveDir(src, dst)
+
+
+def MoveDir(src, dst):
+  Retry(shutil.move, src, dst)
+
+
+def RemoveDir(path):
+  if os.path.exists(path):
+    Retry(shutil.rmtree, path)
+
+
+def RemoveFile(path):
+  if os.path.exists(path):
+    Retry(os.unlink, path)
+
+
+def _HashFileHandle(fh):
+  """sha1 of a file like object.
+
+  Arguments:
+    fh: file handle like object to hash.
+  Returns:
+    sha1 as a string.
+  """
+  hasher = hashlib.sha1()
+  try:
+    while True:
+      data = fh.read(4096)
+      if not data:
+        break
+      hasher.update(data)
+  finally:
+    fh.close()
+  return hasher.hexdigest()
+
+
+def HashFile(filename):
+  """sha1 a file on disk.
+
+  Arguments:
+    filename: filename to hash.
+  Returns:
+    sha1 as a string.
+  """
+  fh = open(filename, 'rb')
+  return _HashFileHandle(fh)
+
+
+def HashUrlByDownloading(url):
+  """sha1 the data at an url.
+
+  Arguments:
+    url: url to download from.
+  Returns:
+    sha1 of the data at the url.
+  """
+  try:
+    fh = urllib2.urlopen(url)
+  except:
+    sys.stderr.write("Failed fetching URL: %s\n" % url)
+    raise
+  return _HashFileHandle(fh)
+
+
+# Attempts to get the SHA1 hash of a file given a URL by looking for
+# an adjacent file with a ".sha1hash" suffix.  This saves having to
+# download a large tarball just to get its hash.  Otherwise, we fall
+# back to downloading the main file.
+def HashUrl(url):
+  hash_url = '%s.sha1hash' % url
+  try:
+    fh = urllib2.urlopen(hash_url)
+    data = fh.read(100)
+    fh.close()
+  except urllib2.HTTPError, exn:
+    if exn.code == 404:
+      return HashUrlByDownloading(url)
+    raise
+  else:
+    if not re.match('[0-9a-f]{40}\n?$', data):
+      raise AssertionError('Bad SHA1 hash file: %r' % data)
+    return data.strip()
+
+
+def SyncURL(url, filename=None, stamp_dir=None, min_time=None,
+            hash_val=None, keep=False, verbose=False, stamp_index=0):
+  """Synchronize a destination file with a URL
+
+  if the URL does not match the URL stamp, then we must re-download it.
+
+  Arugments:
+    url: the url which will to compare against and download
+    filename: the file to create on download
+    path: the download path
+    stamp_dir: the filename containing the URL stamp to check against
+    hash_val: if set, the expected hash which must be matched
+    verbose: prints out status as it runs
+    stamp_index: index within the stamp file to check.
+  Returns:
+    True if the file is replaced
+    False if the file is not replaced
+  Exception:
+    HashError: if the hash does not match
+  """
+
+  assert url and filename
+
+  # If we are not keeping the tarball, or we already have it, we can
+  # skip downloading it for this reason. If we are keeping it,
+  # it must exist.
+  if keep:
+    tarball_ok = os.path.isfile(filename)
+  else:
+    tarball_ok = True
+
+  # If we don't need the tarball and the stamp_file matches the url, then
+  # we must be up to date.  If the URL differs but the recorded hash matches
+  # the one we'll insist the tarball has, then that's good enough too.
+  # TODO(mcgrathr): Download the .sha1sum file first to compare with
+  # the cached hash, in case --file-hash options weren't used.
+  if tarball_ok and stamp_dir is not None:
+    if StampIsCurrent(stamp_dir, SOURCE_STAMP, url, min_time):
+      if verbose:
+        print '%s is already up to date.' % filename
+      return False
+    if (hash_val is not None and
+        StampIsCurrent(stamp_dir, HASH_STAMP, hash_val, min_time, stamp_index)):
+      if verbose:
+        print '%s is identical to the up to date file.' % filename
+      return False
+
+  if verbose:
+    print 'Updating %s\n\tfrom %s.' % (filename, url)
+  EnsureFileCanBeWritten(filename)
+  http_download.HttpDownload(url, filename)
+
+  if hash_val:
+    tar_hash = HashFile(filename)
+    if hash_val != tar_hash:
+      raise HashError(actual_hash=tar_hash, expected_hash=hash_val,
+                      download_url=url)
+
+  return True