Update checked in version of gsutil to version 4.6

gslib/tests/test_cp.py

Index: gslib/tests/test_cp.py
===================================================================
--- gslib/tests/test_cp.py	(revision 33376)
+++ gslib/tests/test_cp.py	(working copy)
@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-#
 # Copyright 2013 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,36 +12,49 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+"""Integration tests for cp command."""
 
-import boto
+from __future__ import absolute_import
+
+import base64
+import binascii
 import datetime
 import os
 import pkgutil
+import random
 import re
+import string
+
+import boto
+from boto import storage_uri
+
+from gslib.copy_helper import GetTrackerFilePath
+from gslib.copy_helper import TrackerFileType
+from gslib.cs_api_map import ApiSelector
+from gslib.hashing_helper import CalculateMd5FromContents
+from gslib.storage_url import StorageUrlFromString
 import gslib.tests.testcase as testcase
+from gslib.tests.testcase.base import NotParallelizable
+from gslib.tests.testcase.integration_testcase import SkipForS3
 from gslib.tests.util import HAS_S3_CREDS
-from gslib.tests.util import unittest
-
-from boto import storage_uri
-from boto.storage_uri import BucketStorageUri
-from gslib.commands.config import DEFAULT_PARALLEL_COMPOSITE_UPLOAD_THRESHOLD
-from gslib.commands.cp import FilterExistingComponents
-from gslib.commands.cp import MakeGsUri
-from gslib.commands.cp import ObjectFromTracker
-from gslib.commands.cp import PerformResumableUploadIfAppliesArgs
-from gslib.storage_uri_builder import StorageUriBuilder
 from gslib.tests.util import ObjectToURI as suri
 from gslib.tests.util import PerformsFileToObjectUpload
 from gslib.tests.util import SetBotoConfigForTest
-from gslib.util import CreateLock
+from gslib.tests.util import unittest
 from gslib.util import IS_WINDOWS
+from gslib.util import ONE_KB
 from gslib.util import Retry
-from gslib.util import TWO_MB
+from gslib.util import START_CALLBACK_PER_BYTES
+from gslib.util import UTF8
 
 
 class TestCp(testcase.GsUtilIntegrationTestCase):
   """Integration tests for cp command."""
 
+  # For tests that artificially halt, we need to ensure at least one callback
+  # occurs.
+  halt_size = START_CALLBACK_PER_BYTES * 2
+
   def _get_test_file(self, name):
     contents = pkgutil.get_data('gslib', 'tests/test_data/%s' % name)
     return self.CreateTempFile(file_name=name, contents=contents)
@@ -61,6 +73,14 @@
       self.assertIn('Skipping existing item: %s' % suri(f), stderr)
       self.assertEqual(f.read(), 'bar')
 
+  def test_dest_bucket_not_exist(self):
+    fpath = self.CreateTempFile(contents='foo')
+    invalid_bucket_uri = (
+        '%s://%s' % (self.default_provider, self.nonexistent_bucket_name))
+    stderr = self.RunGsUtil(['cp', fpath, invalid_bucket_uri],
+                            expected_status=1, return_stderr=True)
+    self.assertIn('does not exist.', stderr)
+
   def test_copy_in_cloud_noclobber(self):
     bucket1_uri = self.CreateBucket()
     bucket2_uri = self.CreateBucket()
@@ -70,158 +90,228 @@
     self.assertEqual(stderr.count('Copying'), 1)
     stderr = self.RunGsUtil(['cp', '-n', suri(key_uri), suri(bucket2_uri)],
                             return_stderr=True)
-    self.assertIn('Skipping existing item: %s' % suri(bucket2_uri,
-                  key_uri.object_name), stderr)
-    
-  def _run_streaming_test(self, provider):
-    bucket_uri = self.CreateBucket(provider=provider)
+    self.assertIn('Skipping existing item: %s' %
+                  suri(bucket2_uri, key_uri.object_name), stderr)
+
+  @PerformsFileToObjectUpload
+  def test_streaming(self):
+    bucket_uri = self.CreateBucket()
     stderr = self.RunGsUtil(['cp', '-', '%s' % suri(bucket_uri, 'foo')],
                             stdin='bar', return_stderr=True)
     self.assertIn('Copying from <STDIN>', stderr)
     key_uri = bucket_uri.clone_replace_name('foo')
     self.assertEqual(key_uri.get_contents_as_string(), 'bar')
 
-  @unittest.skipUnless(HAS_S3_CREDS, 'Test requires S3 credentials.')
-  def test_streaming_s3(self):
-    self._run_streaming_test('s3')
-    
+  def test_streaming_multiple_arguments(self):
+    bucket_uri = self.CreateBucket()
+    stderr = self.RunGsUtil(['cp', '-', '-', suri(bucket_uri)],
+                            stdin='bar', return_stderr=True, expected_status=1)
+    self.assertIn('Multiple URL strings are not supported with streaming',
+                  stderr)
 
-  @PerformsFileToObjectUpload
-  def test_streaming_gs(self):
-    self._run_streaming_test('gs')
-
   # TODO: Implement a way to test both with and without using magic file.
 
   @PerformsFileToObjectUpload
   def test_detect_content_type(self):
+    """Tests local detection of content type."""
     bucket_uri = self.CreateBucket()
     dsturi = suri(bucket_uri, 'foo')
 
     self.RunGsUtil(['cp', self._get_test_file('test.mp3'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+audio/mpeg')
+      if IS_WINDOWS:
+        self.assertTrue(
+            re.search(r'Content-Type:\s+audio/x-mpg', stdout) or
+            re.search(r'Content-Type:\s+audio/mpeg', stdout))
+      else:
+        self.assertRegexpMatches(stdout, r'Content-Type:\s+audio/mpeg')
     _Check1()
 
     self.RunGsUtil(['cp', self._get_test_file('test.gif'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check2():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
     _Check2()
 
-  def test_content_type_override(self):
+  def test_content_type_override_default(self):
+    """Tests overriding content type with the default value."""
     bucket_uri = self.CreateBucket()
     dsturi = suri(bucket_uri, 'foo')
 
     self.RunGsUtil(['-h', 'Content-Type:', 'cp',
                     self._get_test_file('test.mp3'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+binary/octet-stream')
+      self.assertRegexpMatches(stdout,
+                               r'Content-Type:\s+application/octet-stream')
     _Check1()
 
     self.RunGsUtil(['-h', 'Content-Type:', 'cp',
                     self._get_test_file('test.gif'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check2():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+binary/octet-stream')
+      self.assertRegexpMatches(stdout,
+                               r'Content-Type:\s+application/octet-stream')
     _Check2()
 
+  def test_content_type_override(self):
+    """Tests overriding content type with a value."""
+    bucket_uri = self.CreateBucket()
+    dsturi = suri(bucket_uri, 'foo')
+
+    self.RunGsUtil(['-h', 'Content-Type:text/plain', 'cp',
+                    self._get_test_file('test.mp3'), dsturi])
+
+    # Use @Retry as hedge against bucket listing eventual consistency.
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _Check1():
+      stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+text/plain')
+    _Check1()
+
+    self.RunGsUtil(['-h', 'Content-Type:text/plain', 'cp',
+                    self._get_test_file('test.gif'), dsturi])
+
+    # Use @Retry as hedge against bucket listing eventual consistency.
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _Check2():
+      stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+text/plain')
+    _Check2()
+
+  @unittest.skipIf(IS_WINDOWS, 'magicfile is not available on Windows.')
   @PerformsFileToObjectUpload
-  def test_foo_noct(self):
+  def test_magicfile_override(self):
+    """Tests content type override with magicfile value."""
     bucket_uri = self.CreateBucket()
     dsturi = suri(bucket_uri, 'foo')
     fpath = self.CreateTempFile(contents='foo/bar\n')
     self.RunGsUtil(['cp', fpath, dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      USE_MAGICFILE = boto.config.getbool('GSUtil', 'use_magicfile', False)
-      content_type = ('text/plain' if USE_MAGICFILE
+      use_magicfile = boto.config.getbool('GSUtil', 'use_magicfile', False)
+      content_type = ('text/plain' if use_magicfile
                       else 'application/octet-stream')
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+%s' % content_type)
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+%s' % content_type)
     _Check1()
 
   @PerformsFileToObjectUpload
   def test_content_type_mismatches(self):
+    """Tests overriding content type when it does not match the file type."""
     bucket_uri = self.CreateBucket()
     dsturi = suri(bucket_uri, 'foo')
     fpath = self.CreateTempFile(contents='foo/bar\n')
 
     self.RunGsUtil(['-h', 'Content-Type:image/gif', 'cp',
                     self._get_test_file('test.mp3'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
     _Check1()
 
     self.RunGsUtil(['-h', 'Content-Type:image/gif', 'cp',
                     self._get_test_file('test.gif'), dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check2():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
     _Check2()
 
     self.RunGsUtil(['-h', 'Content-Type:image/gif', 'cp', fpath, dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check3():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
     _Check3()
 
   @PerformsFileToObjectUpload
   def test_content_type_header_case_insensitive(self):
+    """Tests that content type header is treated with case insensitivity."""
     bucket_uri = self.CreateBucket()
     dsturi = suri(bucket_uri, 'foo')
     fpath = self._get_test_file('test.gif')
 
     self.RunGsUtil(['-h', 'content-Type:text/plain', 'cp',
                     fpath, dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+text/plain')
-      self.assertNotRegexpMatches(stdout, 'image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+text/plain')
+      self.assertNotRegexpMatches(stdout, r'image/gif')
     _Check1()
 
     self.RunGsUtil(['-h', 'CONTENT-TYPE:image/gif',
                     '-h', 'content-type:image/gif',
                     'cp', fpath, dsturi])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check2():
       stdout = self.RunGsUtil(['ls', '-L', dsturi], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
-      self.assertNotRegexpMatches(stdout, 'image/gif,\s*image/gif')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
+      self.assertNotRegexpMatches(stdout, r'image/gif,\s*image/gif')
     _Check2()
 
   @PerformsFileToObjectUpload
+  def test_other_headers(self):
+    """Tests that non-content-type headers are applied successfully on copy."""
+    bucket_uri = self.CreateBucket()
+    dst_uri = suri(bucket_uri, 'foo')
+    fpath = self._get_test_file('test.gif')
+
+    self.RunGsUtil(['-h', 'Cache-Control:public,max-age=12',
+                    '-h', 'x-%s-meta-1:abcd' % self.provider_custom_meta, 'cp',
+                    fpath, dst_uri])
+
+    stdout = self.RunGsUtil(['ls', '-L', dst_uri], return_stdout=True)
+    self.assertRegexpMatches(stdout, r'Cache-Control\s*:\s*public,max-age=12')
+    self.assertRegexpMatches(stdout, r'Metadata:\s*1:\s*abcd')
+
+    dst_uri2 = suri(bucket_uri, 'bar')
+    self.RunGsUtil(['cp', dst_uri, dst_uri2])
+    # Ensure metadata was preserved across copy.
+    stdout = self.RunGsUtil(['ls', '-L', dst_uri2], return_stdout=True)
+    self.assertRegexpMatches(stdout, r'Cache-Control\s*:\s*public,max-age=12')
+    self.assertRegexpMatches(stdout, r'Metadata:\s*1:\s*abcd')
+
+  @PerformsFileToObjectUpload
   def test_versioning(self):
+    """Tests copy with versioning."""
     bucket_uri = self.CreateVersionedBucket()
     k1_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data2')
     k2_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data1')
-    g1 = k2_uri.generation
+    g1 = k2_uri.generation or k2_uri.version_id
     self.RunGsUtil(['cp', suri(k1_uri), suri(k2_uri)])
     k2_uri = bucket_uri.clone_replace_name(k2_uri.object_name)
     k2_uri = bucket_uri.clone_replace_key(k2_uri.get_key())
-    g2 = k2_uri.generation
+    g2 = k2_uri.generation or k2_uri.version_id
     k2_uri.set_contents_from_string('data3')
-    g3 = k2_uri.generation
+    g3 = k2_uri.generation or k2_uri.version_id
 
     fpath = self.CreateTempFile()
     # Check to make sure current version is data3.
@@ -252,21 +342,27 @@
                             expected_status=1)
     self.assertIn('cannot be the destination for gsutil cp', stderr)
 
+  @SkipForS3('S3 lists versioned objects in reverse timestamp order.')
   def test_recursive_copying_versioned_bucket(self):
-    # Tests that cp -R between versioned buckets copies all versions and
-    # preserves version order.
+    """Tests that cp -R with versioned buckets copies all versions in order."""
     bucket1_uri = self.CreateVersionedBucket()
     bucket2_uri = self.CreateVersionedBucket()
+
     # Write two versions of an object to the bucket1.
-    k_uri = self.CreateObject(bucket_uri=bucket1_uri, object_name='k',
-                              contents='data0')
+    self.CreateObject(bucket_uri=bucket1_uri, object_name='k', contents='data0')
     self.CreateObject(bucket_uri=bucket1_uri, object_name='k',
                       contents='longer_data1')
+
+    self.AssertNObjectsInBucket(bucket1_uri, 2, versioned=True)
+    self.AssertNObjectsInBucket(bucket2_uri, 0, versioned=True)
+
     # Recursively copy to second versioned bucket.
     self.RunGsUtil(['cp', '-R', suri(bucket1_uri, '*'), suri(bucket2_uri)])
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
-    def _Check1():
+    def _Check2():
+      """Validates the results of the cp -R."""
       listing1 = self.RunGsUtil(['ls', '-la', suri(bucket1_uri)],
                                 return_stdout=True).split('\n')
       listing2 = self.RunGsUtil(['ls', '-la', suri(bucket2_uri)],
@@ -290,15 +386,64 @@
       size2, _, uri_str2, _ = listing2[1].split()
       self.assertEquals(size2, str(len('longer_data1')))
       self.assertEquals(storage_uri(uri_str2).object_name, 'k')
-    _Check1()
+    _Check2()
 
   @PerformsFileToObjectUpload
+  @SkipForS3('Preconditions not supported for S3.')
+  def test_cp_v_generation_match(self):
+    """Tests that cp -v option handles the if-generation-match header."""
+    bucket_uri = self.CreateVersionedBucket()
+    k1_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data1')
+    g1 = k1_uri.generation
+
+    tmpdir = self.CreateTempDir()
+    fpath1 = self.CreateTempFile(tmpdir=tmpdir, contents='data2')
+
+    gen_match_header = 'x-goog-if-generation-match:%s' % g1
+    # First copy should succeed.
+    self.RunGsUtil(['-h', gen_match_header, 'cp', fpath1, suri(k1_uri)])
+
+    # Second copy should fail the precondition.
+    stderr = self.RunGsUtil(['-h', gen_match_header, 'cp', fpath1,
+                             suri(k1_uri)],
+                            return_stderr=True, expected_status=1)
+
+    self.assertIn('PreconditionException', stderr)
+
+    # Specifiying a generation with -n should fail before the request hits the
+    # server.
+    stderr = self.RunGsUtil(['-h', gen_match_header, 'cp', '-n', fpath1,
+                             suri(k1_uri)],
+                            return_stderr=True, expected_status=1)
+
+    self.assertIn('ArgumentException', stderr)
+    self.assertIn('Specifying x-goog-if-generation-match is not supported '
+                  'with cp -n', stderr)
+
+  @PerformsFileToObjectUpload
+  def test_cp_nv(self):
+    """Tests that cp -nv works when skipping existing file."""
+    bucket_uri = self.CreateVersionedBucket()
+    k1_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data1')
+
+    tmpdir = self.CreateTempDir()
+    fpath1 = self.CreateTempFile(tmpdir=tmpdir, contents='data2')
+
+    # First copy should succeed.
+    self.RunGsUtil(['cp', '-nv', fpath1, suri(k1_uri)])
+
+    # Second copy should skip copying.
+    stderr = self.RunGsUtil(['cp', '-nv', fpath1, suri(k1_uri)],
+                            return_stderr=True)
+    self.assertIn('Skipping existing item:', stderr)
+
+  @PerformsFileToObjectUpload
+  @SkipForS3('S3 lists versioned objects in reverse timestamp order.')
   def test_cp_v_option(self):
-    # Tests that cp -v option returns the created object's version-specific URI.
+    """"Tests that cp -v returns the created object's version-specific URI."""
     bucket_uri = self.CreateVersionedBucket()
     k1_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data1')
     k2_uri = self.CreateObject(bucket_uri=bucket_uri, contents='data2')
-    g1 = k1_uri.generation
 
     # Case 1: Upload file to object using one-shot PUT.
     tmpdir = self.CreateTempDir()
@@ -306,11 +451,14 @@
     self._run_cp_minus_v_test('-v', fpath1, k2_uri.uri)
 
     # Case 2: Upload file to object using resumable upload.
-    size_threshold = boto.config.get('GSUtil', 'resumable_threshold', TWO_MB)
-    file_as_string = os.urandom(size_threshold)
-    tmpdir = self.CreateTempDir()
-    fpath1 = self.CreateTempFile(tmpdir=tmpdir, contents=file_as_string)
-    self._run_cp_minus_v_test('-v', fpath1, k2_uri.uri)
+    size_threshold = ONE_KB
+    boto_config_for_test = ('GSUtil', 'resumable_threshold',
+                            str(size_threshold))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      file_as_string = os.urandom(size_threshold)
+      tmpdir = self.CreateTempDir()
+      fpath1 = self.CreateTempFile(tmpdir=tmpdir, contents=file_as_string)
+      self._run_cp_minus_v_test('-v', fpath1, k2_uri.uri)
 
     # Case 3: Upload stream to object.
     self._run_cp_minus_v_test('-v', '-', k2_uri.uri)
@@ -331,10 +479,12 @@
     self._run_cp_minus_v_test('-v', k1_uri.uri, k2_uri.uri)
 
   def _run_cp_minus_v_test(self, opt, src_str, dst_str):
+    """Runs cp -v with the options and validates the results."""
     stderr = self.RunGsUtil(['cp', opt, src_str, dst_str], return_stderr=True)
     match = re.search(r'Created: (.*)\n', stderr)
     self.assertIsNotNone(match)
     created_uri = match.group(1)
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
@@ -342,17 +492,20 @@
       lines = stdout.split('\n')
       # Final (most recent) object should match the "Created:" URI. This is
       # in second-to-last line (last line is '\n').
+      self.assertGreater(len(lines), 2)
       self.assertEqual(created_uri, lines[-2])
     _Check1()
 
   @PerformsFileToObjectUpload
   def test_stdin_args(self):
+    """Tests cp with the -I option."""
     tmpdir = self.CreateTempDir()
     fpath1 = self.CreateTempFile(tmpdir=tmpdir, contents='data1')
     fpath2 = self.CreateTempFile(tmpdir=tmpdir, contents='data2')
     bucket_uri = self.CreateBucket()
     self.RunGsUtil(['cp', '-I', suri(bucket_uri)],
                    stdin='\n'.join((fpath1, fpath2)))
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check1():
@@ -362,51 +515,146 @@
       self.assertNumLines(stdout, 2)
     _Check1()
 
-  def test_cross_storage_class_cp(self):
+  def test_cross_storage_class_cloud_cp(self):
     bucket1_uri = self.CreateBucket(storage_class='STANDARD')
     bucket2_uri = self.CreateBucket(
         storage_class='DURABLE_REDUCED_AVAILABILITY')
     key_uri = self.CreateObject(bucket_uri=bucket1_uri, contents='foo')
-    # Check that copy-in-the-cloud is allowed.
-    stderr = self.RunGsUtil(['cp', suri(key_uri), suri(bucket2_uri)],
-                            return_stderr=True, expected_status=0)
-    self.assertIn('Copying ', stderr)
+    # Server now allows copy-in-the-cloud across storage classes.
+    self.RunGsUtil(['cp', suri(key_uri), suri(bucket2_uri)])
 
+  @unittest.skipUnless(HAS_S3_CREDS, 'Test requires both S3 and GS credentials')
+  def test_cross_provider_cp(self):
+    s3_bucket = self.CreateBucket(provider='s3')
+    gs_bucket = self.CreateBucket(provider='gs')
+    s3_key = self.CreateObject(bucket_uri=s3_bucket, contents='foo')
+    gs_key = self.CreateObject(bucket_uri=gs_bucket, contents='bar')
+    self.RunGsUtil(['cp', suri(s3_key), suri(gs_bucket)])
+    self.RunGsUtil(['cp', suri(gs_key), suri(s3_bucket)])
+
+  @unittest.skipUnless(HAS_S3_CREDS, 'Test requires both S3 and GS credentials')
+  @unittest.skip('This test performs a large copy but remains here for '
+                 'debugging purposes.')
+  def test_cross_provider_large_cp(self):
+    s3_bucket = self.CreateBucket(provider='s3')
+    gs_bucket = self.CreateBucket(provider='gs')
+    s3_key = self.CreateObject(bucket_uri=s3_bucket, contents='f'*1024*1024)
+    gs_key = self.CreateObject(bucket_uri=gs_bucket, contents='b'*1024*1024)
+    self.RunGsUtil(['cp', suri(s3_key), suri(gs_bucket)])
+    self.RunGsUtil(['cp', suri(gs_key), suri(s3_bucket)])
+    with SetBotoConfigForTest([
+        ('GSUtil', 'resumable_threshold', str(ONE_KB)),
+        ('GSUtil', 'json_resumable_chunk_size', str(ONE_KB * 256))]):
+      # Ensure copy also works across json upload chunk boundaries.
+      self.RunGsUtil(['cp', suri(s3_key), suri(gs_bucket)])
+
+  @unittest.skip('This test is slow due to creating many objects, '
+                 'but remains here for debugging purposes.')
+  def test_daisy_chain_cp_file_sizes(self):
+    """Ensure daisy chain cp works with a wide of file sizes."""
+    bucket_uri = self.CreateBucket()
+    bucket2_uri = self.CreateBucket()
+    exponent_cap = 22  # Up to 2MB in size.
+    for i in range(exponent_cap):
+      one_byte_smaller = 2**i - 1
+      normal = 2**i
+      one_byte_larger = 2**i + 1
+      self.CreateObject(bucket_uri=bucket_uri, contents='a'*one_byte_smaller)
+      self.CreateObject(bucket_uri=bucket_uri, contents='b'*normal)
+      self.CreateObject(bucket_uri=bucket_uri, contents='c'*one_byte_larger)
+
+    self.AssertNObjectsInBucket(bucket_uri, exponent_cap*3)
+    self.RunGsUtil(['-m', 'cp', '-D', suri(bucket_uri, '**'),
+                    suri(bucket2_uri)])
+
+    self.AssertNObjectsInBucket(bucket2_uri, exponent_cap*3)
+
   def test_daisy_chain_cp(self):
-    # Daisy chain mode is required for copying across storage classes,
-    # so create 2 buckets and attempt to copy without vs with daisy chain mode.
+    """Tests cp with the -D option."""
     bucket1_uri = self.CreateBucket(storage_class='STANDARD')
     bucket2_uri = self.CreateBucket(
         storage_class='DURABLE_REDUCED_AVAILABILITY')
     key_uri = self.CreateObject(bucket_uri=bucket1_uri, contents='foo')
-
     # Set some headers on source object so we can verify that headers are
     # presereved by daisy-chain copy.
     self.RunGsUtil(['setmeta', '-h', 'Cache-Control:public,max-age=12',
                     '-h', 'Content-Type:image/gif',
-                    '-h', 'x-goog-meta-1:abcd', suri(key_uri)])
+                    '-h', 'x-%s-meta-1:abcd' % self.provider_custom_meta,
+                    suri(key_uri)])
     # Set public-read (non-default) ACL so we can verify that cp -D -p works.
     self.RunGsUtil(['acl', 'set', 'public-read', suri(key_uri)])
-    acl_xml = self.RunGsUtil(['acl', 'get', suri(key_uri)], return_stdout=True)
-    # Perform daisy-chain copy and verify that it wasn't disallowed and that
-    # source object headers and ACL were preserved. Also specify -n option to
-    # test that gsutil correctly removes the x-goog-if-generation-match:0 header
-    # that was set at uploading time when updating the ACL.
+    acl_json = self.RunGsUtil(['acl', 'get', suri(key_uri)], return_stdout=True)
+    # Perform daisy-chain copy and verify that source object headers and ACL
+    # were preserved. Also specify -n option to test that gsutil correctly
+    # removes the x-goog-if-generation-match:0 header that was set at uploading
+    # time when updating the ACL.
     stderr = self.RunGsUtil(['cp', '-Dpn', suri(key_uri), suri(bucket2_uri)],
                             return_stderr=True)
-    self.assertIn('Copying ', stderr)
+    self.assertNotIn('Copy-in-the-cloud disallowed', stderr)
 
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _Check():
       uri = suri(bucket2_uri, key_uri.object_name)
       stdout = self.RunGsUtil(['ls', '-L', uri], return_stdout=True)
-      self.assertRegexpMatches(stdout, 'Cache-Control:\s+public,max-age=12')
-      self.assertRegexpMatches(stdout, 'Content-Type:\s+image/gif')
-      self.assertRegexpMatches(stdout, 'x-goog-meta-1:\s+abcd')
-      new_acl_xml = self.RunGsUtil(['acl', 'get', uri], return_stdout=True)
-      self.assertEqual(acl_xml, new_acl_xml)
+      self.assertRegexpMatches(stdout, r'Cache-Control:\s+public,max-age=12')
+      self.assertRegexpMatches(stdout, r'Content-Type:\s+image/gif')
+      self.assertRegexpMatches(stdout, r'Metadata:\s+1:\s+abcd')
+      new_acl_json = self.RunGsUtil(['acl', 'get', uri], return_stdout=True)
+      self.assertEqual(acl_json, new_acl_json)
     _Check()
 
+  def test_canned_acl_cp(self):
+    """Tests copying with a canned ACL."""
+    bucket1_uri = self.CreateBucket()
+    bucket2_uri = self.CreateBucket()
+    key_uri = self.CreateObject(bucket_uri=bucket1_uri, contents='foo')
+    self.RunGsUtil(['cp', '-a', 'public-read', suri(key_uri),
+                    suri(bucket2_uri)])
+    # Set public-read on the original key after the copy so we can compare
+    # the ACLs.
+    self.RunGsUtil(['acl', 'set', 'public-read', suri(key_uri)])
+    public_read_acl = self.RunGsUtil(['acl', 'get', suri(key_uri)],
+                                     return_stdout=True)
+
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _Check():
+      uri = suri(bucket2_uri, key_uri.object_name)
+      new_acl_json = self.RunGsUtil(['acl', 'get', uri], return_stdout=True)
+      self.assertEqual(public_read_acl, new_acl_json)
+    _Check()
+
+  @PerformsFileToObjectUpload
+  def test_canned_acl_upload(self):
+    """Tests uploading a file with a canned ACL."""
+    bucket1_uri = self.CreateBucket()
+    key_uri = self.CreateObject(bucket_uri=bucket1_uri, contents='foo')
+    # Set public-read on the object so we can compare the ACLs.
+    self.RunGsUtil(['acl', 'set', 'public-read', suri(key_uri)])
+    public_read_acl = self.RunGsUtil(['acl', 'get', suri(key_uri)],
+                                     return_stdout=True)
+
+    file_name = 'bar'
+    fpath = self.CreateTempFile(file_name=file_name, contents='foo')
+    self.RunGsUtil(['cp', '-a', 'public-read', fpath, suri(bucket1_uri)])
+    new_acl_json = self.RunGsUtil(['acl', 'get', suri(bucket1_uri, file_name)],
+                                  return_stdout=True)
+    self.assertEqual(public_read_acl, new_acl_json)
+
+    resumable_size = ONE_KB
+    boto_config_for_test = ('GSUtil', 'resumable_threshold',
+                            str(resumable_size))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      resumable_file_name = 'resumable_bar'
+      resumable_contents = os.urandom(resumable_size)
+      resumable_fpath = self.CreateTempFile(
+          file_name=resumable_file_name, contents=resumable_contents)
+      self.RunGsUtil(['cp', '-a', 'public-read', resumable_fpath,
+                      suri(bucket1_uri)])
+      new_resumable_acl_json = self.RunGsUtil(
+          ['acl', 'get', suri(bucket1_uri, resumable_file_name)],
+          return_stdout=True)
+      self.assertEqual(public_read_acl, new_resumable_acl_json)
+
   def test_cp_key_to_local_stream(self):
     bucket_uri = self.CreateBucket()
     contents = 'foo'
@@ -420,23 +668,45 @@
     stdout = self.RunGsUtil(['cp', fpath, '-'], return_stdout=True)
     self.assertIn(contents, stdout)
 
+  @PerformsFileToObjectUpload
+  def test_cp_zero_byte_file(self):
+    dst_bucket_uri = self.CreateBucket()
+    src_dir = self.CreateTempDir()
+    fpath = os.path.join(src_dir, 'zero_byte')
+    with open(fpath, 'w') as unused_out_file:
+      pass  # Write a zero byte file
+    self.RunGsUtil(['cp', fpath, suri(dst_bucket_uri)])
+
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _Check1():
+      stdout = self.RunGsUtil(['ls', suri(dst_bucket_uri)], return_stdout=True)
+      self.assertIn(os.path.basename(fpath), stdout)
+    _Check1()
+
+    download_path = os.path.join(src_dir, 'zero_byte_download')
+    self.RunGsUtil(['cp', suri(dst_bucket_uri, 'zero_byte'), download_path])
+    self.assertTrue(os.stat(download_path))
+
   def test_copy_bucket_to_bucket(self):
-    # Tests that recursively copying from bucket to bucket produces identically
-    # named objects (and not, in particular, destination objects named by the
-    # version- specific URI from source objects).
+    """Tests that recursively copying from bucket to bucket.
+
+    This should produce identically named objects (and not, in particular,
+    destination objects named by the version-specific URI from source objects).
+    """
     src_bucket_uri = self.CreateVersionedBucket()
     dst_bucket_uri = self.CreateVersionedBucket()
     self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj0',
                       contents='abc')
     self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj1',
                       contents='def')
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _CopyAndCheck():
       self.RunGsUtil(['cp', '-R', suri(src_bucket_uri),
                       suri(dst_bucket_uri)])
       stdout = self.RunGsUtil(['ls', '-R', dst_bucket_uri.uri],
-                               return_stdout=True)
+                              return_stdout=True)
       self.assertIn('%s%s/obj0\n' % (dst_bucket_uri,
                                      src_bucket_uri.bucket_name), stdout)
       self.assertIn('%s%s/obj1\n' % (dst_bucket_uri,
@@ -444,31 +714,63 @@
     _CopyAndCheck()
 
   def test_copy_bucket_to_dir(self):
-    # Tests that recursively copying from bucket to dir produces identically
-    # named objects (and not, in particular, destination objects named by the
-    # version- specific URI from source objects).
+    """Tests recursively copying from bucket to a directory.
+
+    This should produce identically named objects (and not, in particular,
+    destination objects named by the version- specific URI from source objects).
+    """
     src_bucket_uri = self.CreateBucket()
     dst_dir = self.CreateTempDir()
     self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj0',
                       contents='abc')
     self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj1',
                       contents='def')
+
     # Use @Retry as hedge against bucket listing eventual consistency.
     @Retry(AssertionError, tries=3, timeout_secs=1)
     def _CopyAndCheck():
+      """Copies the bucket recursively and validates the results."""
       self.RunGsUtil(['cp', '-R', suri(src_bucket_uri), dst_dir])
       dir_list = []
-      for dirname, dirnames, filenames in os.walk(dst_dir):
+      for dirname, _, filenames in os.walk(dst_dir):
         for filename in filenames:
           dir_list.append(os.path.join(dirname, filename))
       dir_list = sorted(dir_list)
       self.assertEqual(len(dir_list), 2)
       self.assertEqual(os.path.join(dst_dir, src_bucket_uri.bucket_name,
-                                    "obj0"), dir_list[0])
+                                    'obj0'), dir_list[0])
       self.assertEqual(os.path.join(dst_dir, src_bucket_uri.bucket_name,
-                                    "obj1"), dir_list[1])
+                                    'obj1'), dir_list[1])
     _CopyAndCheck()
 
+  def test_recursive_download_with_leftover_dir_placeholder(self):
+    """Tests that we correctly handle leftover dir placeholders."""
+    src_bucket_uri = self.CreateBucket()
+    dst_dir = self.CreateTempDir()
+    self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj0',
+                      contents='abc')
+    self.CreateObject(bucket_uri=src_bucket_uri, object_name='obj1',
+                      contents='def')
+
+    # Create a placeholder like what can be left over by web GUI tools.
+    key_uri = src_bucket_uri.clone_replace_name('/')
+    key_uri.set_contents_from_string('')
+    self.AssertNObjectsInBucket(src_bucket_uri, 3)
+
+    stderr = self.RunGsUtil(['cp', '-R', suri(src_bucket_uri), dst_dir],
+                            return_stderr=True)
+    self.assertIn('Skipping cloud sub-directory placeholder object', stderr)
+    dir_list = []
+    for dirname, _, filenames in os.walk(dst_dir):
+      for filename in filenames:
+        dir_list.append(os.path.join(dirname, filename))
+    dir_list = sorted(dir_list)
+    self.assertEqual(len(dir_list), 2)
+    self.assertEqual(os.path.join(dst_dir, src_bucket_uri.bucket_name,
+                                  'obj0'), dir_list[0])
+    self.assertEqual(os.path.join(dst_dir, src_bucket_uri.bucket_name,
+                                  'obj1'), dir_list[1])
+
   def test_copy_quiet(self):
     bucket_uri = self.CreateBucket()
     key_uri = self.CreateObject(bucket_uri=bucket_uri, contents='foo')
@@ -477,17 +779,51 @@
                             return_stderr=True)
     self.assertEqual(stderr.count('Copying '), 0)
 
+  def test_cp_md5_match(self):
+    """Tests that the uploaded object has the expected MD5.
+
+    Note that while this does perform a file to object upload, MD5's are
+    not supported for composite objects so we don't use the decorator in this
+    case.
+    """
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile(contents='bar')
+    with open(fpath, 'r') as f_in:
+      file_md5 = base64.encodestring(binascii.unhexlify(
+          CalculateMd5FromContents(f_in))).rstrip('\n')
+    self.RunGsUtil(['cp', fpath, suri(bucket_uri)])
+
+    # Use @Retry as hedge against bucket listing eventual consistency.
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _Check1():
+      stdout = self.RunGsUtil(['ls', '-L', suri(bucket_uri)],
+                              return_stdout=True)
+      self.assertRegexpMatches(stdout,
+                               r'Hash\s+\(md5\):\s+%s' % re.escape(file_md5))
+    _Check1()
+
+  @unittest.skipIf(IS_WINDOWS,
+                   'Unicode handling on Windows requires mods to site-packages')
   @PerformsFileToObjectUpload
+  def test_cp_manifest_upload_unicode(self):
+    return self._ManifestUpload('foo-unicöde', 'bar-unicöde',
+                                'manifest-unicöde')
+
+  @PerformsFileToObjectUpload
   def test_cp_manifest_upload(self):
+    """Tests uploading with a mnifest file."""
+    return self._ManifestUpload('foo', 'bar', 'manifest')
+
+  def _ManifestUpload(self, file_name, object_name, manifest_name):
+    """Tests uploading with a manifest file."""
     bucket_uri = self.CreateBucket()
-    dsturi = suri(bucket_uri, 'foo')
+    dsturi = suri(bucket_uri, object_name)
 
-    fpath = self.CreateTempFile(contents='bar')
-    logpath = self.CreateTempFile(contents='')
+    fpath = self.CreateTempFile(file_name=file_name, contents='bar')
+    logpath = self.CreateTempFile(file_name=manifest_name, contents='')
     # Ensure the file is empty.
     open(logpath, 'w').close()
-    stdout = self.RunGsUtil(['cp', '-L', logpath, fpath, dsturi],
-                            return_stdout=True)
+    self.RunGsUtil(['cp', '-L', logpath, fpath, dsturi])
     with open(logpath, 'r') as f:
       lines = f.readlines()
     self.assertEqual(len(lines), 2)
@@ -498,7 +834,8 @@
     self.assertEqual(expected_headers, lines[0].strip().split(','))
     results = lines[1].strip().split(',')
     self.assertEqual(results[0][:7], 'file://')  # source
-    self.assertEqual(results[1][:5], 'gs://')  # destination
+    self.assertEqual(results[1][:5], '%s://' %
+                     self.default_provider)      # destination
     date_format = '%Y-%m-%dT%H:%M:%S.%fZ'
     start_date = datetime.datetime.strptime(results[2], date_format)
     end_date = datetime.datetime.strptime(results[3], date_format)
@@ -508,20 +845,21 @@
       # calculate the MD5 hash. Since RunGsUtil is overriden in
       # TestCpParallelUploads to force parallel uploads, we can check which
       # method was used.
-      self.assertEqual(results[4], '37b51d194a7513e45b56f6524f2d51f2')  # md5
+      self.assertEqual(results[4], 'rL0Y20zC+Fzt72VPzMSk2A==')  # md5
     self.assertEqual(int(results[6]), 3)  # Source Size
     self.assertEqual(int(results[7]), 3)  # Bytes Transferred
     self.assertEqual(results[8], 'OK')  # Result
 
   @PerformsFileToObjectUpload
   def test_cp_manifest_download(self):
+    """Tests downloading with a manifest file."""
     key_uri = self.CreateObject(contents='foo')
     fpath = self.CreateTempFile(contents='')
     logpath = self.CreateTempFile(contents='')
     # Ensure the file is empty.
     open(logpath, 'w').close()
-    stdout = self.RunGsUtil(['cp', '-L', logpath, suri(key_uri), fpath],
-                            return_stdout=True)
+    self.RunGsUtil(['cp', '-L', logpath, suri(key_uri), fpath],
+                   return_stdout=True)
     with open(logpath, 'r') as f:
       lines = f.readlines()
     self.assertEqual(len(lines), 2)
@@ -531,14 +869,14 @@
                         'Result', 'Description']
     self.assertEqual(expected_headers, lines[0].strip().split(','))
     results = lines[1].strip().split(',')
-    self.assertEqual(results[0][:5], 'gs://')  # source
+    self.assertEqual(results[0][:5], '%s://' %
+                     self.default_provider)      # source
     self.assertEqual(results[1][:7], 'file://')  # destination
     date_format = '%Y-%m-%dT%H:%M:%S.%fZ'
     start_date = datetime.datetime.strptime(results[2], date_format)
     end_date = datetime.datetime.strptime(results[3], date_format)
     self.assertEqual(end_date > start_date, True)
-    # TODO: fix this when CRC32C's are added to the manifest.
-    # self.assertEqual(results[4], '37b51d194a7513e45b56f6524f2d51f2')  # md5
+    self.assertEqual(results[4], 'rL0Y20zC+Fzt72VPzMSk2A==')  # md5
     self.assertEqual(int(results[6]), 3)  # Source Size
     # Bytes transferred might be more than 3 if the file was gzipped, since
     # the minimum gzip header is 10 bytes.
@@ -552,20 +890,43 @@
     # to construct tracker filename).
     fpath = self.CreateTempFile(file_name=u'Аудиоархив',
                                 contents='x' * 3 * 1024 * 1024)
-    fpath_bytes = fpath.encode('utf-8')
+    fpath_bytes = fpath.encode(UTF8)
     stderr = self.RunGsUtil(['cp', fpath_bytes, suri(key_uri)],
                             return_stderr=True)
     self.assertIn('Copying file:', stderr)
 
+  # Note: We originally one time implemented a test
+  # (test_copy_invalid_unicode_filename) that invalid unicode filenames were
+  # skipped, but it turns out os.walk() on MacOS doesn't have problems with
+  # such files (so, failed that test). Given that, we decided to remove the
+  # test.
+
   def test_gzip_upload_and_download(self):
-    key_uri = self.CreateObject()
+    bucket_uri = self.CreateBucket()
     contents = 'x' * 10000
-    fpath1 = self.CreateTempFile(file_name='test.html', contents=contents)
-    self.RunGsUtil(['cp', '-z', 'html', suri(fpath1), suri(key_uri)])
-    fpath2 = self.CreateTempFile()
-    self.RunGsUtil(['cp', suri(key_uri), suri(fpath2)])
-    with open(fpath2, 'r') as f:
-      self.assertEqual(f.read(), contents)
+    tmpdir = self.CreateTempDir()
+    self.CreateTempFile(file_name='test.html', tmpdir=tmpdir, contents=contents)
+    self.CreateTempFile(file_name='test.js', tmpdir=tmpdir, contents=contents)
+    self.CreateTempFile(file_name='test.txt', tmpdir=tmpdir, contents=contents)
+    # Test that copying specifying only 2 of the 3 prefixes gzips the correct
+    # files, and test that including whitespace in the extension list works.
+    self.RunGsUtil(['cp', '-z', 'js, html',
+                    os.path.join(tmpdir, 'test.*'), suri(bucket_uri)])
+    self.AssertNObjectsInBucket(bucket_uri, 3)
+    uri1 = suri(bucket_uri, 'test.html')
+    uri2 = suri(bucket_uri, 'test.js')
+    uri3 = suri(bucket_uri, 'test.txt')
+    stdout = self.RunGsUtil(['stat', uri1], return_stdout=True)
+    self.assertRegexpMatches(stdout, r'Content-Encoding:\s+gzip')
+    stdout = self.RunGsUtil(['stat', uri2], return_stdout=True)
+    self.assertRegexpMatches(stdout, r'Content-Encoding:\s+gzip')
+    stdout = self.RunGsUtil(['stat', uri3], return_stdout=True)
+    self.assertNotRegexpMatches(stdout, r'Content-Encoding:\s+gzip')
+    fpath4 = self.CreateTempFile()
+    for uri in (uri1, uri2, uri3):
+      self.RunGsUtil(['cp', uri, suri(fpath4)])
+      with open(fpath4, 'r') as f:
+        self.assertEqual(f.read(), contents)
 
   def test_upload_with_subdir_and_unexpanded_wildcard(self):
     fpath1 = self.CreateTempFile(file_name=('tmp', 'x', 'y', 'z'))
@@ -575,12 +936,37 @@
                             return_stderr=True)
     self.assertIn('Copying file:', stderr)
 
+  def test_cp_object_ending_with_slash(self):
+    """Tests that cp works with object names ending with slash."""
+    tmpdir = self.CreateTempDir()
+    bucket_uri = self.CreateBucket()
+    self.CreateObject(bucket_uri=bucket_uri,
+                      object_name='abc/',
+                      contents='dir')
+    self.CreateObject(bucket_uri=bucket_uri,
+                      object_name='abc/def',
+                      contents='def')
+    self.RunGsUtil(['cp', '-R', suri(bucket_uri), tmpdir])
+    # Check that files in the subdir got copied even though subdir object
+    # download was skipped.
+    with open(os.path.join(tmpdir, bucket_uri.bucket_name, 'abc', 'def')) as f:
+      self.assertEquals('def', '\n'.join(f.readlines()))
+
   def test_cp_without_read_access(self):
-    object_uri = self.CreateObject(contents='foo')
+    """Tests that cp fails without read access to the object."""
+    # TODO: With 401's triggering retries in apitools, this test will take
+    # a long time.  Ideally, make apitools accept a num_retries config for this
+    # until we stop retrying the 401's.
+    bucket_uri = self.CreateBucket()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, contents='foo')
+
+    # Use @Retry as hedge against bucket listing eventual consistency.
+    self.AssertNObjectsInBucket(bucket_uri, 1)
+
     with self.SetAnonymousBotoCreds():
       stderr = self.RunGsUtil(['cp', suri(object_uri), 'foo'],
-                              return_stderr = True, expected_status=1)
-      self.assertIn('Access denied to', stderr)
+                              return_stderr=True, expected_status=1)
+      self.assertIn('AccessDenied', stderr)
 
   @unittest.skipIf(IS_WINDOWS, 'os.symlink() is not available on Windows.')
   def test_cp_minus_e(self):
@@ -596,132 +982,434 @@
     self.assertIn('Copying file', stderr)
     self.assertIn('Skipping symbolic link file', stderr)
 
-  def test_filter_existing_components_non_versioned(self):
+  def test_cp_multithreaded_wildcard(self):
+    """Tests that cp -m works with a wildcard."""
+    num_test_files = 5
+    tmp_dir = self.CreateTempDir(test_files=num_test_files)
     bucket_uri = self.CreateBucket()
-    tracker_file = self.CreateTempFile(file_name='foo', contents='asdf')
-    tracker_file_lock = CreateLock()
+    wildcard_uri = '%s%s*' % (tmp_dir, os.sep)
+    self.RunGsUtil(['-m', 'cp', wildcard_uri, suri(bucket_uri)])
+    self.AssertNObjectsInBucket(bucket_uri, num_test_files)
 
-    # Already uploaded, contents still match, component still used.
-    fpath_uploaded_correctly = self.CreateTempFile(file_name='foo1',
-                                                   contents='1')
-    key_uploaded_correctly = self.CreateObject(object_name='foo1', contents='1',
-                                               bucket_uri=bucket_uri)
-    args_uploaded_correctly = PerformResumableUploadIfAppliesArgs(
-        fpath_uploaded_correctly, 0, 1, fpath_uploaded_correctly,
-        key_uploaded_correctly, '', {}, tracker_file, tracker_file_lock)
+  @SkipForS3('No resumable upload support for S3.')
+  def test_cp_resumable_upload_break(self):
+    """Tests that an upload can be resumed after a connection break."""
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile(contents='a' * self.halt_size)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', fpath,
+                               suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting upload', stderr)
+      stderr = self.RunGsUtil(['cp', fpath, suri(bucket_uri)],
+                              return_stderr=True)
+      self.assertIn('Resuming upload', stderr)
 
-    # Not yet uploaded, but needed.
-    fpath_not_uploaded = self.CreateTempFile(file_name='foo2', contents='2')
-    key_not_uploaded = self.CreateObject(object_name='foo2', contents='2',
-                                         bucket_uri=bucket_uri)
-    args_not_uploaded = PerformResumableUploadIfAppliesArgs(
-        fpath_not_uploaded, 0, 1, fpath_not_uploaded, key_not_uploaded, '', {},
-        tracker_file, tracker_file_lock)
+  @SkipForS3('No resumable upload support for S3.')
+  def test_cp_resumable_upload(self):
+    """Tests that a basic resumable upload completes successfully."""
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile(contents='a' * self.halt_size)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      self.RunGsUtil(['cp', fpath, suri(bucket_uri)])
 
-    # Already uploaded, but contents no longer match. Even though the contents
-    # differ, we don't delete this since the bucket is not versioned and it
-    # will be overwritten anyway.
-    fpath_wrong_contents = self.CreateTempFile(file_name='foo4', contents='4')
-    key_wrong_contents = self.CreateObject(object_name='foo4', contents='_',
-                             bucket_uri=bucket_uri)
-    args_wrong_contents = PerformResumableUploadIfAppliesArgs(
-        fpath_wrong_contents, 0, 1, fpath_wrong_contents, key_wrong_contents,
-        '', {}, tracker_file, tracker_file_lock)
+  @SkipForS3('No resumable upload support for S3.')
+  def test_resumable_upload_break_leaves_tracker(self):
+    """Tests that a tracker file is created with a resumable upload."""
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile(file_name='foo',
+                                contents='a' * self.halt_size)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      tracker_filename = GetTrackerFilePath(
+          StorageUrlFromString(suri(bucket_uri, 'foo')),
+          TrackerFileType.UPLOAD, self.test_api)
+      try:
+        stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', fpath,
+                                 suri(bucket_uri, 'foo')],
+                                expected_status=1, return_stderr=True)
+        self.assertIn('Artifically halting upload', stderr)
+        self.assertTrue(os.path.exists(tracker_filename),
+                        'Tracker file %s not present.' % tracker_filename)
+      finally:
+        if os.path.exists(tracker_filename):
+          os.unlink(tracker_filename)
 
-    # Exists in tracker file, but component object no longer exists.
-    fpath_remote_deleted = self.CreateTempFile(file_name='foo5', contents='5')
-    args_remote_deleted = PerformResumableUploadIfAppliesArgs(
-        fpath_remote_deleted, 0, 1, fpath_remote_deleted, '', '', {},
-        tracker_file, tracker_file_lock)
+  @SkipForS3('No resumable upload support for S3.')
+  def test_cp_resumable_upload_break_file_size_change(self):
+    """Tests a resumable upload where the uploaded file changes size.
 
-    # Exists in tracker file and already uploaded, but no longer needed.
-    fpath_no_longer_used = self.CreateTempFile(file_name='foo6', contents='6')
-    key_no_longer_used = self.CreateObject(object_name='foo6', contents='6',
-                             bucket_uri=bucket_uri)
+    This should fail when we read the tracker data.
+    """
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                contents='a' * self.halt_size)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', fpath,
+                               suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting upload', stderr)
+      fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                  contents='a' * self.halt_size * 2)
+      stderr = self.RunGsUtil(['cp', fpath, suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('ResumableUploadAbortException', stderr)
 
-    dst_args = {fpath_uploaded_correctly:args_uploaded_correctly,
-                fpath_not_uploaded:args_not_uploaded,
-                fpath_wrong_contents:args_wrong_contents,
-                fpath_remote_deleted:args_remote_deleted}
+  @SkipForS3('No resumable upload support for S3.')
+  def test_cp_resumable_upload_break_file_content_change(self):
+    """Tests a resumable upload where the uploaded file changes content."""
+    if self.test_api == ApiSelector.XML:
+      return unittest.skip(
+          'XML doesn\'t make separate HTTP calls at fixed-size boundaries for '
+          'resumable uploads, so we can\'t guarantee that the server saves a '
+          'specific part of the upload.')
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                contents='a' * ONE_KB * 512)
+    resumable_threshold_for_test = (
+        'GSUtil', 'resumable_threshold', str(ONE_KB))
+    resumable_chunk_size_for_test = (
+        'GSUtil', 'json_resumable_chunk_size', str(ONE_KB * 256))
+    with SetBotoConfigForTest([resumable_threshold_for_test,
+                               resumable_chunk_size_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', str(ONE_KB * 384), fpath,
+                               suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting upload', stderr)
+      fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                  contents='b' * ONE_KB * 512)
+      stderr = self.RunGsUtil(['cp', fpath, suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('doesn\'t match cloud-supplied digest', stderr)
 
-    existing_components = [ObjectFromTracker(fpath_uploaded_correctly, ''),
-                           ObjectFromTracker(fpath_wrong_contents, ''),
-                           ObjectFromTracker(fpath_remote_deleted, ''),
-                           ObjectFromTracker(fpath_no_longer_used, '')]
+  @SkipForS3('No resumable upload support for S3.')
+  def test_cp_resumable_upload_break_file_smaller_size(self):
+    """Tests a resumable upload where the uploaded file changes content.
 
-    suri_builder = StorageUriBuilder(0, BucketStorageUri)
+    This should fail hash validation.
+    """
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                contents='a' * ONE_KB * 512)
+    resumable_threshold_for_test = (
+        'GSUtil', 'resumable_threshold', str(ONE_KB))
+    resumable_chunk_size_for_test = (
+        'GSUtil', 'json_resumable_chunk_size', str(ONE_KB * 256))
+    with SetBotoConfigForTest([resumable_threshold_for_test,
+                               resumable_chunk_size_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', str(ONE_KB * 384), fpath,
+                               suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting upload', stderr)
+      fpath = self.CreateTempFile(file_name='foo', tmpdir=tmp_dir,
+                                  contents='a' * ONE_KB)
+      stderr = self.RunGsUtil(['cp', fpath, suri(bucket_uri)],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('ResumableUploadAbortException', stderr)
 
-    (components_to_upload, uploaded_components, existing_objects_to_delete) = (
-        FilterExistingComponents(dst_args, existing_components,
-                                 bucket_uri.bucket_name, suri_builder))
+  # This temporarily changes the tracker directory to unwritable which
+  # interferes with any parallel running tests that use the tracker directory.
+  @NotParallelizable
+  @SkipForS3('No resumable upload support for S3.')
+  @unittest.skipIf(IS_WINDOWS, 'chmod on dir unsupported on Windows.')
+  @PerformsFileToObjectUpload
+  def test_cp_unwritable_tracker_file(self):
+    """Tests a resumable upload with an unwritable tracker file."""
+    bucket_uri = self.CreateBucket()
+    tracker_filename = GetTrackerFilePath(
+        StorageUrlFromString(suri(bucket_uri, 'foo')),
+        TrackerFileType.UPLOAD, self.test_api)
+    tracker_dir = os.path.dirname(tracker_filename)
+    fpath = self.CreateTempFile(file_name='foo', contents='a' * ONE_KB)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    save_mod = os.stat(tracker_dir).st_mode
 
-    for arg in [args_not_uploaded, args_wrong_contents, args_remote_deleted]:
-      self.assertTrue(arg in components_to_upload)
-    self.assertEqual(str([args_uploaded_correctly.dst_uri]),
-                     str(uploaded_components))
-    self.assertEqual(
-        str([MakeGsUri(bucket_uri.bucket_name, fpath_no_longer_used,
-                       suri_builder)]),
-        str(existing_objects_to_delete))
+    try:
+      os.chmod(tracker_dir, 0)
+      with SetBotoConfigForTest([boto_config_for_test]):
+        stderr = self.RunGsUtil(['cp', fpath, suri(bucket_uri)],
+                                expected_status=1, return_stderr=True)
+        self.assertIn('Couldn\'t write tracker file', stderr)
+    finally:
+      os.chmod(tracker_dir, save_mod)
+      if os.path.exists(tracker_filename):
+        os.unlink(tracker_filename)
 
-  def test_filter_existing_components_versioned(self):
-    suri_builder = StorageUriBuilder(0, BucketStorageUri)
-    bucket_uri = self.CreateVersionedBucket()
-    tracker_file = self.CreateTempFile(file_name='foo', contents='asdf')
-    tracker_file_lock = CreateLock()
+  def test_cp_resumable_download_break(self):
+    """Tests that a download can be resumed after a connection break."""
+    bucket_uri = self.CreateBucket()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='a' * self.halt_size)
+    fpath = self.CreateTempFile()
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', suri(object_uri),
+                               fpath], expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting download.', stderr)
+      tracker_filename = GetTrackerFilePath(
+          StorageUrlFromString(fpath), TrackerFileType.DOWNLOAD, self.test_api)
+      self.assertTrue(os.path.isfile(tracker_filename))
+      stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                              return_stderr=True)
+      self.assertIn('Resuming download', stderr)
 
-    # Already uploaded, contents still match, component still used.
-    fpath_uploaded_correctly = self.CreateTempFile(file_name='foo1',
-                                                   contents='1')
-    key_uploaded_correctly = self.CreateObject(object_name='foo1', contents='1',
-                                               bucket_uri=bucket_uri)
-    args_uploaded_correctly = PerformResumableUploadIfAppliesArgs(
-        fpath_uploaded_correctly, 0, 1, fpath_uploaded_correctly,
-        key_uploaded_correctly, key_uploaded_correctly.generation, {},
-        tracker_file, tracker_file_lock)
+  def test_cp_resumable_download_etag_differs(self):
+    """Tests that download restarts the file when the source object changes.
 
-    # Duplicate object name in tracker file, but uploaded correctly.
-    fpath_duplicate = fpath_uploaded_correctly
-    key_duplicate = self.CreateObject(object_name='foo1', contents='1',
-                                      bucket_uri=bucket_uri)
-    args_duplicate = PerformResumableUploadIfAppliesArgs(
-        fpath_duplicate, 0, 1, fpath_duplicate, key_duplicate,
-        key_duplicate.generation, {}, tracker_file, tracker_file_lock)
-    object_name_duplicate = ObjectFromTracker(fpath_duplicate,
-        key_duplicate.generation).object_name
-    uri_duplicate = MakeGsUri(bucket_uri.bucket_name, object_name_duplicate,
-                              suri_builder)
-    uri_duplicate.generation = args_duplicate.dst_uri.generation
+    This causes the etag not to match.
+    """
+    bucket_uri = self.CreateBucket()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='a' * self.halt_size)
+    fpath = self.CreateTempFile()
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      # This will create a tracker file with an ETag.
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', suri(object_uri),
+                               fpath], expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting download.', stderr)
+      # Create a new object with different contents - it should have a
+      # different ETag since the content has changed.
+      object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                     contents='b' * self.halt_size)
+      stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                              return_stderr=True)
+      self.assertNotIn('Resuming download', stderr)
 
-    # Already uploaded, but contents no longer match.
-    fpath_wrong_contents = self.CreateTempFile(file_name='foo4', contents='4')
-    key_wrong_contents = self.CreateObject(object_name='foo4', contents='_',
-                                           bucket_uri=bucket_uri)
-    args_wrong_contents = PerformResumableUploadIfAppliesArgs(
-        fpath_wrong_contents, 0, 1, fpath_wrong_contents, key_wrong_contents,
-        key_wrong_contents.generation, {}, tracker_file, tracker_file_lock)
+  def test_cp_resumable_download_file_larger(self):
+    """Tests download deletes the tracker file when existing file is larger."""
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='a' * self.halt_size)
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', suri(object_uri),
+                               fpath],
+                              expected_status=1, return_stderr=True)
+      self.assertIn('Artifically halting download.', stderr)
+      with open(fpath, 'w') as larger_file:
+        for _ in range(self.halt_size * 2):
+          larger_file.write('a')
+      stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                              expected_status=1, return_stderr=True)
+      self.assertNotIn('Resuming download', stderr)
+      self.assertIn('is larger', stderr)
+      self.assertIn('Deleting tracker file', stderr)
 
-    dst_args = {fpath_uploaded_correctly:args_uploaded_correctly,
-                fpath_wrong_contents:args_wrong_contents}
+  def test_cp_resumable_download_content_differs(self):
+    """Tests that we do not re-download when tracker file matches existing file.
 
-    existing_components = [ObjectFromTracker(fpath_uploaded_correctly,
-                                             key_uploaded_correctly.generation),
-                           ObjectFromTracker(fpath_duplicate,
-                                             key_duplicate.generation),
-                           ObjectFromTracker(fpath_wrong_contents,
-                                             key_wrong_contents.generation)]
+    We only compare size, not contents, so re-download should not occur even
+    though the contents are technically different. However, hash validation on
+    the file should still occur and we will delete the file then because
+    the hashes differ.
+    """
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    fpath = self.CreateTempFile(tmpdir=tmp_dir, contents='abcd' * ONE_KB)
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='efgh' * ONE_KB)
+    stdout = self.RunGsUtil(['ls', '-L', suri(object_uri)], return_stdout=True)
+    etag_match = re.search(r'\s*ETag:\s*(.*)', stdout)
+    self.assertIsNotNone(etag_match, 'Could not get object ETag')
+    self.assertEqual(len(etag_match.groups()), 1,
+                     'Did not match expected single ETag')
+    etag = etag_match.group(1)
 
-    (components_to_upload, uploaded_components, existing_objects_to_delete) = (
-        FilterExistingComponents(dst_args, existing_components,
-                                 bucket_uri.bucket_name, suri_builder))
+    tracker_filename = GetTrackerFilePath(
+        StorageUrlFromString(fpath), TrackerFileType.DOWNLOAD, self.test_api)
+    try:
+      with open(tracker_filename, 'w') as tracker_fp:
+        tracker_fp.write(etag)
+      boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+      with SetBotoConfigForTest([boto_config_for_test]):
+        stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                                return_stderr=True, expected_status=1)
+        self.assertIn('Download already complete for file', stderr)
+        self.assertIn('doesn\'t match cloud-supplied digest', stderr)
+        # File and tracker file should be deleted.
+        self.assertFalse(os.path.isfile(fpath))
+        self.assertFalse(os.path.isfile(tracker_filename))
+    finally:
+      if os.path.exists(tracker_filename):
+        os.unlink(tracker_filename)
 
-    self.assertEqual([args_wrong_contents], components_to_upload)
-    self.assertEqual(str([args_uploaded_correctly.dst_uri]),
-                     str(uploaded_components))
-    expected_to_delete = [(args_wrong_contents.dst_uri.object_name,
-                           args_wrong_contents.dst_uri.generation),
-                          (uri_duplicate.object_name,
-                           args_duplicate.dst_uri.generation)]
-    for uri in existing_objects_to_delete:
-      self.assertTrue((uri.object_name, uri.generation) in expected_to_delete)
-    self.assertEqual(len(expected_to_delete), len(existing_objects_to_delete))
+  def test_cp_resumable_download_content_matches(self):
+    """Tests download no-ops when tracker file matches existing file."""
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    matching_contents = 'abcd' * ONE_KB
+    fpath = self.CreateTempFile(tmpdir=tmp_dir, contents=matching_contents)
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents=matching_contents)
+    stdout = self.RunGsUtil(['ls', '-L', suri(object_uri)], return_stdout=True)
+    etag_match = re.search(r'\s*ETag:\s*(.*)', stdout)
+    self.assertIsNotNone(etag_match, 'Could not get object ETag')
+    self.assertEqual(len(etag_match.groups()), 1,
+                     'Did not match expected single ETag')
+    etag = etag_match.group(1)
+    tracker_filename = GetTrackerFilePath(
+        StorageUrlFromString(fpath), TrackerFileType.DOWNLOAD, self.test_api)
+    with open(tracker_filename, 'w') as tracker_fp:
+      tracker_fp.write(etag)
+    try:
+      boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+      with SetBotoConfigForTest([boto_config_for_test]):
+        stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                                return_stderr=True)
+        self.assertIn('Download already complete for file', stderr)
+        # Tracker file should be removed after successful hash validation.
+        self.assertFalse(os.path.isfile(tracker_filename))
+    finally:
+      if os.path.exists(tracker_filename):
+        os.unlink(tracker_filename)
+
+  def test_cp_resumable_download_tracker_file_not_matches(self):
+    """Tests that download overwrites when tracker file etag does not match."""
+    bucket_uri = self.CreateBucket()
+    tmp_dir = self.CreateTempDir()
+    fpath = self.CreateTempFile(tmpdir=tmp_dir, contents='abcd' * ONE_KB)
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='efgh' * ONE_KB)
+    stdout = self.RunGsUtil(['ls', '-L', suri(object_uri)], return_stdout=True)
+    etag_match = re.search(r'\s*ETag:\s*(.*)', stdout)
+    self.assertIsNotNone(etag_match, 'Could not get object ETag')
+    self.assertEqual(len(etag_match.groups()), 1,
+                     'Did not match regex for exactly one object ETag')
+    etag = etag_match.group(1)
+    etag += 'nonmatching'
+    tracker_filename = GetTrackerFilePath(
+        StorageUrlFromString(fpath), TrackerFileType.DOWNLOAD, self.test_api)
+    with open(tracker_filename, 'w') as tracker_fp:
+      tracker_fp.write(etag)
+    try:
+      boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+      with SetBotoConfigForTest([boto_config_for_test]):
+        stderr = self.RunGsUtil(['cp', suri(object_uri), fpath],
+                                return_stderr=True)
+        self.assertNotIn('Resuming download', stderr)
+        # Ensure the file was overwritten.
+        with open(fpath, 'r') as in_fp:
+          contents = in_fp.read()
+          self.assertEqual(contents, 'efgh' * ONE_KB,
+                           'File not overwritten when it should have been '
+                           'due to a non-matching tracker file.')
+        self.assertFalse(os.path.isfile(tracker_filename))
+    finally:
+      if os.path.exists(tracker_filename):
+        os.unlink(tracker_filename)
+
+  def test_cp_resumable_download_gzip(self):
+    """Tests that download can be resumed successfully with a gzipped file."""
+    # Generate some reasonably incompressible data.  This compresses to a bit
+    # around 128K in practice, but we assert specifically below that it is
+    # larger than self.halt_size to guarantee that we can halt the download
+    # partway through.
+    object_uri = self.CreateObject()
+    random.seed(0)
+    contents = str([random.choice(string.ascii_letters)
+                    for _ in xrange(ONE_KB * 128)])
+    random.seed()  # Reset the seed for any other tests.
+    fpath1 = self.CreateTempFile(file_name='unzipped.txt', contents=contents)
+    self.RunGsUtil(['cp', '-z', 'txt', suri(fpath1), suri(object_uri)])
+
+    # Use @Retry as hedge against bucket listing eventual consistency.
+    @Retry(AssertionError, tries=3, timeout_secs=1)
+    def _GetObjectSize():
+      stdout = self.RunGsUtil(['du', suri(object_uri)], return_stdout=True)
+      size_match = re.search(r'(\d+)\s+.*', stdout)
+      self.assertIsNotNone(size_match, 'Could not get object size')
+      self.assertEqual(len(size_match.groups()), 1,
+                       'Did not match regex for exactly one object size.')
+      return long(size_match.group(1))
+
+    object_size = _GetObjectSize()
+    self.assertGreaterEqual(object_size, self.halt_size,
+                            'Compresed object size was not large enough to '
+                            'allow for a halted download, so the test results '
+                            'would be invalid. Please increase the compressed '
+                            'object size in the test.')
+    fpath2 = self.CreateTempFile()
+    boto_config_for_test = ('GSUtil', 'resumable_threshold', str(ONE_KB))
+    with SetBotoConfigForTest([boto_config_for_test]):
+      stderr = self.RunGsUtil(['cp', '--haltatbyte', '5', suri(object_uri),
+                               suri(fpath2)],
+                              return_stderr=True, expected_status=1)
+      self.assertIn('Artifically halting download.', stderr)
+      tracker_filename = GetTrackerFilePath(
+          StorageUrlFromString(fpath2), TrackerFileType.DOWNLOAD, self.test_api)
+      self.assertTrue(os.path.isfile(tracker_filename))
+      self.assertIn('Downloading to temp gzip filename', stderr)
+      # We should have a temporary gzipped file, a tracker file, and no
+      # final file yet.
+      self.assertTrue(os.path.isfile('%s_.gztmp' % fpath2))
+      stderr = self.RunGsUtil(['cp', suri(object_uri), suri(fpath2)],
+                              return_stderr=True)
+      self.assertIn('Resuming download', stderr)
+      with open(fpath2, 'r') as f:
+        self.assertEqual(f.read(), contents, 'File contents did not match.')
+      self.assertFalse(os.path.isfile(tracker_filename))
+      self.assertFalse(os.path.isfile('%s_.gztmp' % fpath2))
+
+  def test_cp_minus_c(self):
+    bucket_uri = self.CreateBucket()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='foo')
+    self.RunGsUtil(
+        ['cp', '-c', suri(bucket_uri) + '/foo2', suri(object_uri),
+         suri(bucket_uri) + '/dir/'],
+        expected_status=1)
+    self.RunGsUtil(['stat', '%s/dir/foo' % suri(bucket_uri)])
+
+
+class TestCpUnitTests(testcase.GsUtilUnitTestCase):
+  """Unit tests for gsutil cp."""
+
+  def testDownloadWithNoHashAvailable(self):
+    """Tests a download with no valid server-supplied hash."""
+    # S3 should have a special message for non-MD5 etags.
+    bucket_uri = self.CreateBucket(provider='s3')
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, contents='foo')
+    object_uri.get_key().etag = '12345'  # Not an MD5
+    dst_dir = self.CreateTempDir()
+
+    log_handler = self.RunCommand(
+        'cp', [suri(object_uri), dst_dir], return_log_handler=True)
+    warning_messages = log_handler.messages['warning']
+    self.assertEquals(2, len(warning_messages))
+    self.assertRegexpMatches(
+        warning_messages[0],
+        r'Non-MD5 etag \(12345\) present for key .*, '
+        r'data integrity checks are not possible')
+    self.assertIn('Integrity cannot be assured', warning_messages[1])
+
+  def test_object_and_prefix_same_name(self):
+    bucket_uri = self.CreateBucket()
+    object_uri = self.CreateObject(bucket_uri=bucket_uri, object_name='foo',
+                                   contents='foo')
+    self.CreateObject(bucket_uri=bucket_uri,
+                      object_name='foo/bar', contents='bar')
+    fpath = self.CreateTempFile()
+    # MockKey doesn't support hash_algs, so the MD5 will not match.
+    with SetBotoConfigForTest([('GSUtil', 'check_hashes', 'never')]):
+      self.RunCommand('cp', [suri(object_uri), fpath])
+    with open(fpath, 'r') as f:
+      self.assertEqual(f.read(), 'foo')
+
+  def test_cp_upload_respects_no_hashes(self):
+    bucket_uri = self.CreateBucket()
+    fpath = self.CreateTempFile(contents='abcd')
+    with SetBotoConfigForTest([('GSUtil', 'check_hashes', 'never')]):
+      log_handler = self.RunCommand('cp', [fpath, suri(bucket_uri)],
+                                    return_log_handler=True)
+    warning_messages = log_handler.messages['warning']
+    self.assertEquals(1, len(warning_messages))
+    self.assertIn('Found no hashes to validate object upload',
+                  warning_messages[0])