Revert "Fix checkout.py issues when p.patchlevel > 1."

This reverts commit 5908f9906d.

Reason for revert:
Introduces bugs when deleting files.
The reason is that 
  patchlevel = patchlevel or self.patchlevel
will evaluate to self.patchlevel also when patchlevel is 0, which is wrong.

Original change's description:
> Fix checkout.py issues when p.patchlevel > 1.
> 
> When p.patchlevel > 1, p.filename does not correspond to the files that
> git-apply would modify.
> 
> See bug for details
> 
> Bug: 764294
> Change-Id: Icdb803056e306edb25238b2d9cdabd3ff175d8ed
> Reviewed-on: https://chromium-review.googlesource.com/663357
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=kjellander@chromium.org,agable@chromium.org,ehmaldonado@chromium.org

Change-Id: Ifa1f94602a023228cb32e5fe3fa07586b466981a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 764294
Reviewed-on: https://chromium-review.googlesource.com/663266
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

checkout.py

@@ -252,8 +252,7 @@ class GitCheckout(CheckoutBase):
     for index, p in enumerate(patches):
       stdout = []
       try:
-        filepath = os.path.join(self.project_path,
-                                p.filename_after_patchlevel())
+        filepath = os.path.join(self.project_path, p.filename)
         if p.is_delete:
           if (not os.path.exists(filepath) and
               any(p1.source_filename == p.filename for p1 in patches[0:index])):
@@ -261,12 +260,11 @@ class GitCheckout(CheckoutBase):
             # was already processed because 'git apply' did it for us.
             pass
           else:
-            stdout.append(self._check_output_git(
-                ['rm', p.filename_after_patchlevel()]))
+            stdout.append(self._check_output_git(['rm', p.filename]))
             assert(not os.path.exists(filepath))
             stdout.append('Deleted.')
         else:
-          dirname = os.path.dirname(p.filename_after_patchlevel())
+          dirname = os.path.dirname(p.filename)
           full_dir = os.path.join(self.project_path, dirname)
           if dirname and not os.path.isdir(full_dir):
             os.makedirs(full_dir)
@@ -276,7 +274,7 @@ class GitCheckout(CheckoutBase):
             with open(filepath, 'wb') as f:
               f.write(content)
             stdout.append('Added binary file %d bytes' % len(content))
-            cmd = ['add', p.filename_after_patchlevel()]
+            cmd = ['add', p.filename]
             if verbose:
               cmd.append('--verbose')
             stdout.append(self._check_output_git(cmd))

patch.py

@@ -34,7 +34,6 @@ class FilePatchBase(object):
   def __init__(self, filename):
     assert self.__class__ is not FilePatchBase
     self.filename = self._process_filename(filename)
-    self.patchlevel = 0
     # Set when the file is copied or moved.
     self.source_filename = None
 
@@ -66,25 +65,6 @@ class FilePatchBase(object):
           filename, 'Filename can\'t be \'%s\'.' % filename)
     return filename
 
-  def filename_after_patchlevel(self):
-    """Applies patchlevel to self.filename.
-
-    Applies patchlevel to self.filename so the resulting filename is the same as
-    the one git-apply would have used.
-    """
-    # We use self.patchlevel-1 since git-apply considers the "a/" in the diff
-    # as part of the file path.
-    return self._apply_patchlevel(self.filename, self.patchlevel-1)
-
-  def _apply_patchlevel(self, string, patchlevel=None):
-    """Apply patchlevel to a file path.
-
-    This function replaces backslashes with slashes and removes the first
-    patchlevel elements of string. patchlevel is self.patchlevel by default.
-    """
-    patchlevel = patchlevel or self.patchlevel
-    return '/'.join(string.replace('\\', '/').split('/')[patchlevel:])
-
   def set_relpath(self, relpath):
     if not relpath:
       return
@@ -183,6 +163,7 @@ class FilePatchDiff(FilePatchBase):
     self.diff_header, self.diff_hunks = self._split_header(diff)
     self.svn_properties = svn_properties or []
     self.is_git_diff = self._is_git_diff_header(self.diff_header)
+    self.patchlevel = 0
     if self.is_git_diff:
       self._verify_git_header()
     else:
@@ -333,6 +314,10 @@ class FilePatchDiff(FilePatchBase):
       hunks[0].start_src -= 1
     return hunks
 
+  def mangle(self, string):
+    """Mangle a file path."""
+    return '/'.join(string.replace('\\', '/').split('/')[self.patchlevel:])
+
   def _verify_git_header(self):
     """Sanity checks the header.
 
@@ -361,8 +346,8 @@ class FilePatchDiff(FilePatchBase):
         continue
       if match.group(1).startswith('a/') and match.group(2).startswith('b/'):
         self.patchlevel = 1
-      old = self._apply_patchlevel(match.group(1))
-      new = self._apply_patchlevel(match.group(2))
+      old = self.mangle(match.group(1))
+      new = self.mangle(match.group(2))
 
       # The rename is about the new file so the old file can be anything.
       if new not in (self.filename_utf8, 'dev/null'):
@@ -445,7 +430,7 @@ class FilePatchDiff(FilePatchBase):
         self._fail('--- and +++ are reversed')
       if match.group(1) == '/dev/null':
         self.is_new = True
-      elif self._apply_patchlevel(match.group(1)) != old:
+      elif self.mangle(match.group(1)) != old:
         # git patches are always well formatted, do not allow random filenames.
         self._fail('Unexpected git diff: %s != %s.' % (old, match.group(1)))
       if not lines or not lines[0].startswith('+++'):
@@ -458,7 +443,7 @@ class FilePatchDiff(FilePatchBase):
         self._fail('Unexpected git diff: --- not following +++.')
       if '/dev/null' == match.group(1):
         self.is_delete = True
-      elif self.filename_utf8 != self._apply_patchlevel(match.group(1)):
+      elif self.filename_utf8 != self.mangle(match.group(1)):
         self._fail(
             'Unexpected git diff: %s != %s.' % (self.filename, match.group(1)))
       if lines:
@@ -497,7 +482,7 @@ class FilePatchDiff(FilePatchBase):
         self._fail('--- and +++ are reversed')
       if match.group(1) == '/dev/null':
         self.is_new = True
-      elif self._apply_patchlevel(match.group(1)) != self.filename_utf8:
+      elif self.mangle(match.group(1)) != self.filename_utf8:
         # guess the source filename.
         self.source_filename = match.group(1).decode('utf-8')
         self.is_new = True
@@ -511,7 +496,7 @@ class FilePatchDiff(FilePatchBase):
         self._fail('Unexpected diff: --- not following +++.')
       if match.group(1) == '/dev/null':
         self.is_delete = True
-      elif self._apply_patchlevel(match.group(1)) != self.filename_utf8:
+      elif self.mangle(match.group(1)) != self.filename_utf8:
         self._fail('Unexpected diff: %s.' % match.group(1))
       if lines:
         self._fail('Crap after +++')

tests/checkout_test.py

@@ -180,23 +180,6 @@ class BaseTest(fake_repos.FakeReposTestBase):
     #print fake_repos.read_tree(root)
     self.assertTree(tree, root)
 
-  def _check_delete_patchlevel(self, co):
-    """Makes sure file moves are handled correctly."""
-    co.prepare(None)
-    patchset = patch.PatchSet([
-        patch.FilePatchDelete(
-            'something/chromeos/views/DOMui_menu_widget.h', False),
-    ])
-    for p in patchset:
-      p.patchlevel = 2
-    co.apply_patch(patchset)
-    # Make sure chromeos/views/DOMui_menu_widget.h is deleted and
-    # chromeos/views/webui_menu_widget.h is correctly created.
-    root = os.path.join(self.root_dir, self.name)
-    tree = self.get_trunk(False)
-    del tree['chromeos/views/DOMui_menu_widget.h']
-    self.assertTree(tree, root)
-
 
 class GitBaseTest(BaseTest):
   def setUp(self):
@@ -338,19 +321,6 @@ class GitCheckout(GitBaseTest):
       ])
     self.assertEquals(expected, out)
 
-  def testDeletePatchlevel(self):
-    co = self._get_co(None)
-    self._check_delete_patchlevel(co)
-    out = subprocess2.check_output(
-        ['git', 'diff', '--staged', '--name-status', '--no-renames'],
-        cwd=co.project_path)
-    out = sorted(out.splitlines())
-    expected = sorted(
-      [
-        'D\tchromeos/views/DOMui_menu_widget.h',
-      ])
-    self.assertEquals(expected, out)
-
 
 if __name__ == '__main__':
   if '-v' in sys.argv: