If the destination directory doesn't contain the desired repo, delete it

gclient_scm.py

 # Copyright (c) 2012 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 collections
 import logging
 import os
 import posixpath
@@ skipping 197 matching lines @@
       result, version = scm.GIT.AssertVersion('1.7')
       if not result:
         raise gclient_utils.Error('Git version is older than 1.7: %s' % version)
       return result
     except OSError:
       return False
 
   def GetCheckoutRoot(self):
     return scm.GIT.GetCheckoutRoot(self.checkout_path)
 
+  def GetRemoteURL(self, options, cwd=None):
+    try:
+      return self._Capture(['config', 'remote.origin.url'],
+                           cwd=cwd or self.checkout_path).rstrip()
+    except (OSError, subprocess2.CalledProcessError):
+      return None
+
   def GetRevisionDate(self, _revision):
     """Returns the given revision's date in ISO-8601 format (which contains the
     time zone)."""
     # TODO(floitsch): get the time-stamp of the given revision and not just the
     # time-stamp of the currently checked out revision.
     return self._Capture(['log', '-n', '1', '--format=%ai'])
 
   @staticmethod
   def cleanup(options, args, file_list):
     """'Cleanup' the repo.
@@ skipping 37 matching lines @@
       # Not a fatal error, or even very interesting in a non-git-submodule
       # world.  So just keep it quiet.
       pass
     try:
       gclient_utils.CheckCallAndFilter(cmd3, **kwargs)
     except subprocess2.CalledProcessError:
       gclient_utils.CheckCallAndFilter(cmd3 + ['always'], **kwargs)
 
     gclient_utils.CheckCallAndFilter(cmd4, **kwargs)
 
-  def _FetchAndReset(self, revision, file_list, options):
-    """Equivalent to git fetch; git reset."""
-    quiet = []
-    if not options.verbose:
-      quiet = ['--quiet']
-    self._UpdateBranchHeads(options, fetch=False)
-
-    fetch_cmd = [
-      '-c', 'core.deltaBaseCacheLimit=2g', 'fetch', 'origin', '--prune']
-    self._Run(fetch_cmd + quiet, options, retry=True)
-    self._Run(['reset', '--hard', revision] + quiet, options)
-    self.UpdateSubmoduleConfig()
-    if file_list is not None:
-      files = self._Capture(['ls-files']).splitlines()
-      file_list.extend([os.path.join(self.checkout_path, f) for f in files])
-
   def update(self, options, args, file_list):
     """Runs git to update or transparently checkout the working copy.
 
     All updated files will be appended to file_list.
 
     Raises:
       Error: if can't get URL for relative path.
     """
     if args:
       raise gclient_utils.Error("Unsupported argument(s): %s" % ",".join(args))
@@ skipping 65 matching lines @@
       return self._Capture(['rev-parse', '--verify', 'HEAD'])
 
     if not os.path.exists(os.path.join(self.checkout_path, '.git')):
       raise gclient_utils.Error('\n____ %s%s\n'
                                 '\tPath is not a git repo. No .git dir.\n'
                                 '\tTo resolve:\n'
                                 '\t\trm -rf %s\n'
                                 '\tAnd run gclient sync again\n'
                                 % (self.relpath, rev_str, self.relpath))
 
-    # See if the url has changed (the unittests use git://foo for the url, let
-    # that through).
-    current_url = self._Capture(['config', 'remote.origin.url'])
-    return_early = False
-    # TODO(maruel): Delete url != 'git://foo' since it's just to make the
-    # unit test pass. (and update the comment above)
-    # Skip url auto-correction if remote.origin.gclient-auto-fix-url is set.
-    # This allows devs to use experimental repos which have a different url
-    # but whose branch(s) are the same as official repos.
-    if (current_url != url and
-        url != 'git://foo' and
-        subprocess2.capture(
-            ['git', 'config', 'remote.origin.gclient-auto-fix-url'],
-            cwd=self.checkout_path).strip() != 'False'):
-      print('_____ switching %s to a new upstream' % self.relpath)
-      # Make sure it's clean
-      self._CheckClean(rev_str)
-      # Switch over to the new upstream
-      self._Run(['remote', 'set-url', 'origin', url], options)
-      self._FetchAndReset(revision, file_list, options)
-      return_early = True
-
     # Need to do this in the normal path as well as in the post-remote-switch
     # path.
     self._PossiblySwitchCache(url, options)
 
-    if return_early:
-      return self._Capture(['rev-parse', '--verify', 'HEAD'])
-
     cur_branch = self._GetCurrentBranch()
 
     # Cases:
     # 0) HEAD is detached. Probably from our initial clone.
     #   - make sure HEAD is contained by a named ref, then update.
     # Cases 1-4. HEAD is a branch.
     # 1) current branch is not tracking a remote branch (could be git-svn)
     #   - try to rebase onto the new hash or branch
     # 2) current branch is tracking a remote branch with local committed
     #    changes, but the DEPS file switched to point to a hash
@@ skipping 385 matching lines @@
         if use_reference:
           cmd += ['--reference', os.path.abspath(self.checkout_path)]
 
         self._Run(cmd + [url, folder],
                   options, filter_fn=filter_fn, cwd=self.cache_dir, retry=True)
       else:
         # For now, assert that host/path/to/repo.git is identical. We may want
         # to relax this restriction in the future to allow for smarter cache
         # repo update schemes (such as pulling the same repo, but from a
         # different host).
-        existing_url = self._Capture(['config', 'remote.origin.url'],
-                                     cwd=folder)
+        existing_url = self.GetRemoteURL(options, cwd=folder)
         assert self._NormalizeGitURL(existing_url) == self._NormalizeGitURL(url)
 
         if use_reference:
           with open(altfile, 'w') as f:
             f.write(os.path.abspath(checkout_objects))
 
         # Would normally use `git remote update`, but it doesn't support
         # --progress, so use fetch instead.
         self._Run(['fetch'] + v + ['--multiple', '--progress', '--all'],
                   options, filter_fn=filter_fn, cwd=folder, retry=True)
@@ skipping 248 matching lines @@
       result, version = scm.SVN.AssertVersion('1.4')
       if not result:
         raise gclient_utils.Error('SVN version is older than 1.4: %s' % version)
       return result
     except OSError:
       return False
 
   def GetCheckoutRoot(self):
     return scm.SVN.GetCheckoutRoot(self.checkout_path)
 
+  def GetRemoteURL(self, options):
+    try:
+      local_info = scm.SVN.CaptureLocalInfo([os.curdir], self.checkout_path)
+    except (OSError, subprocess2.CalledProcessError):
+      return None
+    return local_info.get('URL')
+
   def GetRevisionDate(self, revision):
     """Returns the given revision's date in ISO-8601 format (which contains the
     time zone)."""
     date = scm.SVN.Capture(
         ['propget', '--revprop', 'svn:date', '-r', revision],
         os.path.join(self.checkout_path, '.'))
     return date.strip()
 
   def cleanup(self, options, args, _file_list):
     """Cleanup working copy."""
@@ skipping 123 matching lines @@
               print 'Not removing troublesome path %s automatically.' % d[1]
               if d[0][0] == '!':
                 print 'You can pass --force to enable automatic removal.'
               raise e
 
     # Retrieve the current HEAD version because svn is slow at null updates.
     if options.manually_grab_svn_rev and not revision:
       from_info_live = scm.SVN.CaptureRemoteInfo(from_info['URL'])
       revision = str(from_info_live['Revision'])
       rev_str = ' at %s' % revision
 

[borenet, 2013/12/10 18:48:27]

I missed this section before - Isaac, this URL rewriting needs to go, right?

[Isaac (away), 2013/12/11 03:17:33]

I'm not very familiar with this, having essentially only used gclient for git. 
If it doesn't conflict with your patch we could keep it.  I suggested removing
the git rewrite section because it had known flaws in addition to being
confusing.

Maybe Robbie knows more?  If we don't hear from him I'd suggest keeping it.

[borenet, 2013/12/11 20:42:19]

It does conflict.  When I overrode the googlecode_url in an existing checkout
using custom_vars, the checkouts were migrated using this code rather than
deleted.

[iannucci, 2014/01/07 22:23:28]

So IIUC, the new behavior will simply nuke the conflicting directory instead of
trying to rewrite/preserve it (only if --force, or if the user picks 'yes').

This sounds fine to me... in the git-future, we should be relying on a global
object cache anyway, so this url relocation will be unnecessary.

[borenet, 2014/01/08 18:25:33]

Exactly.

-    if from_info['URL'] != base_url:
-      # The repository url changed, need to switch.
-      try:
-        to_info = scm.SVN.CaptureRemoteInfo(url)
-      except (gclient_utils.Error, subprocess2.CalledProcessError):
-        # The url is invalid or the server is not accessible, it's safer to bail
-        # out right now.
-        raise gclient_utils.Error('This url is unreachable: %s' % url)
-      can_switch = ((from_info['Repository Root'] != to_info['Repository Root'])
-                    and (from_info['UUID'] == to_info['UUID']))
-      if can_switch:
-        print('\n_____ relocating %s to a new checkout' % self.relpath)
-        # We have different roots, so check if we can switch --relocate.
-        # Subversion only permits this if the repository UUIDs match.
-        # Perform the switch --relocate, then rewrite the from_url
-        # to reflect where we "are now."  (This is the same way that
-        # Subversion itself handles the metadata when switch --relocate
-        # is used.)  This makes the checks below for whether we
-        # can update to a revision or have to switch to a different
-        # branch work as expected.
-        # TODO(maruel):  TEST ME !
-        command = ['switch', '--relocate',
-                   from_info['Repository Root'],
-                   to_info['Repository Root'],
-                   self.relpath]
-        self._Run(command, options, cwd=self._root_dir)
-        from_info['URL'] = from_info['URL'].replace(
-            from_info['Repository Root'],
-            to_info['Repository Root'])
-      else:
-        if not options.force and not options.reset:
-          # Look for local modifications but ignore unversioned files.
-          for status in scm.SVN.CaptureStatus(None, self.checkout_path):
-            if status[0][0] != '?':
-              raise gclient_utils.Error(
-                  ('Can\'t switch the checkout to %s; UUID don\'t match and '
-                   'there is local changes in %s. Delete the directory and '
-                   'try again.') % (url, self.checkout_path))
-        # Ok delete it.
-        print('\n_____ switching %s to a new checkout' % self.relpath)
-        gclient_utils.rmtree(self.checkout_path)
-        # We need to checkout.
-        command = ['checkout', url, self.checkout_path]
-        command = self._AddAdditionalUpdateFlags(command, options, revision)
-        self._RunAndGetFileList(command, options, file_list, self._root_dir)
-        return self.Svnversion()
-
     # If the provided url has a revision number that matches the revision
     # number of the existing directory, then we don't need to bother updating.
     if not options.force and str(from_info['Revision']) == revision:
       if options.verbose or not forced_revision:
         print('\n_____ %s%s' % (self.relpath, rev_str))
     else:
       command = ['update', self.checkout_path]
       command = self._AddAdditionalUpdateFlags(command, options, revision)
       self._RunAndGetFileList(command, options, file_list, self._root_dir)
 
@@ skipping 169 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