depot_tools: Add git svn find-rev for safesync_url parsing (commonly LKGR link).

gclient_scm.py

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Gclient-specific SCM-specific operations."""
 
 import logging
 import os
 import posixpath
 import re
@@ skipping 465 matching lines @@
     """Display status information."""
     if not os.path.isdir(self.checkout_path):
       print(('\n________ couldn\'t run status in %s:\n'
              'The directory does not exist.') % self.checkout_path)
     else:
       merge_base = self._Capture(['merge-base', 'HEAD', 'origin'])
       self._Run(['diff', '--name-status', merge_base], options)
       files = self._Capture(['diff', '--name-only', merge_base]).split()
       file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
+  def GetUsableRev(self, rev, options):
+    """Finds a useful revision for this repository.
+
+    If SCM is git-svn and the head revision is less than |rev|, git svn fetch
+    will be called on the source."""
+    sha1 = None
+    # As an optimization, only verify an SVN revision as [0-9]{1,6} for now to
+    # avoid making a network request.
+    if (scm.GIT.IsGitSvn(cwd=self.checkout_path) and
+        rev.isdigit() and len(rev) < 7):
+      local_head = scm.GIT.GetGitSvnHeadRev(cwd=self.checkout_path)
+      if not local_head or local_head < int(rev):
+        if options.verbose:
+          print('Running git svn fetch. This might take a while.\n')
+        scm.GIT.Capture(['svn', 'fetch'], cwd=self.checkout_path)
+      sha1 = scm.GIT.GetSha1ForSvnRev(cwd=self.checkout_path, rev=rev)
+    elif scm.GIT.IsValidRevision(cwd=self.checkout_path, rev=rev):
+      sha1 = rev
+    if not sha1:
+      raise gclient_utils.Error(
+          ( '%s is not a value hash. Safesync URLs with a git checkout\n'
+            'currently require a git-svn remote or a safesync_url that\n'
+            'provides git sha1s. Please add a git-svn remote or change\n'
+            'your safesync_url. For more info, see:\n'
+            'http://code.google.com/p/chromium/wiki/UsingNewGit'
+            '#Initial_checkout') % rev)
+    return sha1
+
   def FullUrlForRelativeUrl(self, url):
     # Strip from last '/'
     # Equivalent to unix basename
     base_url = self.url
     return base_url[:base_url.rfind('/')] + url
 
   def _Clone(self, revision, url, options):
     """Clone a git repository from the given URL.
 
     Once we've cloned the repo, we checkout a working branch if the specified
@@ skipping 499 matching lines @@
     command = ['status'] + args
     if not os.path.isdir(self.checkout_path):
       # svn status won't work if the directory doesn't exist.
       print(('\n________ couldn\'t run \'%s\' in \'%s\':\n'
              'The directory does not exist.') %
                 (' '.join(command), self.checkout_path))
       # There's no file list to retrieve.
     else:
       self._RunAndGetFileList(command, options, file_list)
 
+  def GetUsableRev(self, rev, options):
+    """Verifies the validity of the revision for this repository."""
+    if not scm.SVN.IsValidRevision(url='%s@%s' % (self.url, rev)):
+      raise gclient_utils.Error(
+        ( '%s isn\'t a valid revision. Please check that your safesync_url is\n'
+          'correct.') % rev)
+    return rev
+
   def FullUrlForRelativeUrl(self, url):
     # Find the forth '/' and strip from there. A bit hackish.
     return '/'.join(self.url.split('/')[:4]) + url
 
   def _Run(self, args, options, **kwargs):
     """Runs a commands that goes to stdout."""
     kwargs.setdefault('cwd', self.checkout_path)
     gclient_utils.CheckCallAndFilterAndHeader(['svn'] + args,
         always=options.verbose, **kwargs)
 
@@ skipping 29 matching lines @@
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'theirs-conflict'))
     elif options.manually_grab_svn_rev:
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'postpone'))
     elif command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
       new_command.extend(('--accept', 'postpone'))
     return new_command