Repair any mis-directed android-1.0 annotated tags

The initial open source release of the Android 1.0 platform had
some problems with its Perforce->Git imports.  Google was forced
to rewrite some history to redirect users onto more stable upstream
sources and correct errors in the imports.

Not everyone has the correct android-1.0 tags, as some users did
manage to fetch the platform early, before the mirror sites crashed
and the history was rewritten.

This change is a band-aid to ensure any stale android-1.0 tags are
get updated to the corrected version.  It should be backed out at
some point in the near future, when we can be fairly certain that
everyone has the correct android-1.0 tags.

Signed-off-by: Shawn O. Pearce <sop@google.com>

manifest.py

@@ -26,6 +26,7 @@ from remote import Remote
 from error import ManifestParseError
 
 MANIFEST_FILE_NAME = 'manifest.xml'
+LOCAL_MANIFEST_NAME = 'local_manifest.xml'
 
 class _Default(object):
   """Project defaults within the manifest."""
@@ -108,10 +109,20 @@ class Manifest(object):
 
   def _Load(self):
     if not self._loaded:
-      self._ParseManifest()
+      self._ParseManifest(True)
+
+      local = os.path.join(self.repodir, LOCAL_MANIFEST_NAME)
+      if os.path.exists(local):
+        try:
+          real = self.manifestFile
+          self.manifestFile = local
+          self._ParseManifest(False)
+        finally:
+          self.manifestFile = real
+
       self._loaded = True
 
-  def _ParseManifest(self):
+  def _ParseManifest(self, is_root_file):
     root = xml.dom.minidom.parse(self.manifestFile)
     if not root or not root.childNodes:
       raise ManifestParseError, \
@@ -124,9 +135,10 @@ class Manifest(object):
             "no <manifest> in %s" % \
             self.manifestFile
 
-    self.branch = config.getAttribute('branch')
-    if not self.branch:
-      self.branch = 'default'
+    if is_root_file:
+      self.branch = config.getAttribute('branch')
+      if not self.branch:
+        self.branch = 'default'
 
     for node in config.childNodes:
       if node.nodeName == 'remote':

project.py

@@ -45,6 +45,31 @@ def _info(fmt, *args):
 def not_rev(r):
   return '^' + r
 
+class DownloadedChange(object):
+  _commit_cache = None
+
+  def __init__(self, project, base, change_id, ps_id, commit):
+    self.project = project
+    self.base = base
+    self.change_id = change_id
+    self.ps_id = ps_id
+    self.commit = commit
+
+  @property
+  def commits(self):
+    if self._commit_cache is None:
+      self._commit_cache = self.project.bare_git.rev_list(
+        '--abbrev=8',
+        '--abbrev-commit',
+        '--pretty=oneline',
+        '--reverse',
+        '--date-order',
+        not_rev(self.base),
+        self.commit,
+        '--')
+    return self._commit_cache
+
+
 class ReviewableBranch(object):
   _commit_cache = None
 
@@ -445,6 +470,7 @@ class Project(object):
       return False
     if not self._RemoteFetch():
       return False
+    self._RepairAndroidImportErrors()
     self._InitMRef()
     return True
     
@@ -452,6 +478,30 @@ class Project(object):
     for file in self.copyfiles:
       file._Copy()
 
+  def _RepairAndroidImportErrors(self):
+    if self.name in ['platform/external/iptables',
+                     'platform/external/libpcap',
+                     'platform/external/tcpdump',
+                     'platform/external/webkit',
+                     'platform/system/wlan/ti']:
+      # I hate myself for doing this...
+      #
+      # In the initial Android 1.0 release these projects were
+      # shipped, some users got them, and then the history had
+      # to be rewritten to correct problems with their imports.
+      # The 'android-1.0' tag may still be pointing at the old
+      # history, so we need to drop the tag and fetch it again.
+      #
+      try:
+        remote = self.GetRemote(self.remote.name)
+        relname = remote.ToLocal(R_HEADS + 'release-1.0')
+        tagname = R_TAGS + 'android-1.0'
+        if self._revlist(not_rev(relname), tagname):
+          cmd = ['fetch', remote.name, '+%s:%s' % (tagname, tagname)]
+          GitCommand(self, cmd, bare = True).Wait()
+      except GitError:
+        pass
+
   def Sync_LocalHalf(self):
     """Perform only the local IO portion of the sync process.
        Network access is not required.
@@ -612,6 +662,23 @@ class Project(object):
     src = os.path.join(self.worktree, src)
     self.copyfiles.append(_CopyFile(src, dest))
 
+  def DownloadPatchSet(self, change_id, patch_id):
+    """Download a single patch set of a single change to FETCH_HEAD.
+    """
+    remote = self.GetRemote(self.remote.name)
+
+    cmd = ['fetch', remote.name]
+    cmd.append('refs/changes/%2.2d/%d/%d' \
+               % (change_id % 100, change_id, patch_id))
+    cmd.extend(map(lambda x: str(x), remote.fetch))
+    if GitCommand(self, cmd, bare=True).Wait() != 0:
+      return None
+    return DownloadedChange(self,
+                            remote.ToLocal(self.revision),
+                            change_id,
+                            patch_id,
+                            self.bare_git.rev_parse('FETCH_HEAD'))
+
 
 ## Branch Management ##
 

subcmds/download.py

@@ -0,0 +1,78 @@
+#
+# Copyright (C) 2008 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+import os
+import re
+import sys
+
+from command import Command
+
+CHANGE_RE = re.compile(r'^([1-9][0-9]*)(?:[/\.-]([1-9][0-9]*))?$')
+
+class Download(Command):
+  common = True
+  helpSummary = "Download and checkout a change"
+  helpUsage = """
+%prog {project change[/patchset]}...
+"""
+  helpDescription = """
+The '%prog' command downloads a change from the review system and
+makes it available in your project's local working directory.
+"""
+
+  def _Options(self, p):
+    pass
+
+  def _ParseChangeIds(self, args):
+    to_get = []
+    project = None
+
+    for a in args:
+      m = CHANGE_RE.match(a)
+      if m:
+        if not project:
+          self.Usage()
+        chg_id = int(m.group(1))
+        if m.group(2):
+          ps_id = int(m.group(2))
+        else:
+          ps_id = 1
+        to_get.append((project, chg_id, ps_id))
+      else:
+        project = self.GetProjects([a])[0]
+    return to_get
+
+  def Execute(self, opt, args):
+    for project, change_id, ps_id in self._ParseChangeIds(args):
+      dl = project.DownloadPatchSet(change_id, ps_id)
+      if not dl:
+        print >>sys.stderr, \
+          '[%s] change %d/%d not found' \
+          % (project.name, change_id, ps_id)
+        sys.exit(1)
+
+      if not dl.commits:
+        print >>sys.stderr, \
+          '[%s] change %d/%d has already been merged' \
+          % (project.name, change_id, ps_id)
+        continue
+
+      if len(dl.commits) > 1:
+        print >>sys.stderr, \
+          '[%s] %d/%d depends on %d unmerged changes:' \
+          % (project.name, change_id, ps_id, len(dl.commits))
+        for c in dl.commits:
+          print >>sys.stderr, '  %s' % (c)
+      project._Checkout(dl.commit)