Revert "Implementation of manifest defined githooks"

This reverts commit 38e4387f8e.

A "repo init" followed by "repo sync" is meant to be as safe as
"git clone".  In particular it should not run arbitrary code provided
by the manifest owner.

It would still be nice to have support for manifest-defined git hooks
--- they'd just need a prompt like the upload RepoHook has.  Hopefully
a later change can bring them back.

Change-Id: I5ecd90fb5c2ed64f103d856d1ffcba38a47b062d
Signed-off-by: Jonathan Nieder <jrn@google.com>

manifest_xml.py

@@ -64,9 +64,7 @@ class _XmlRemote(object):
                fetch=None,
                manifestUrl=None,
                review=None,
-               revision=None,
-               projecthookName=None,
-               projecthookRevision=None):
+               revision=None):
     self.name = name
     self.fetchUrl = fetch
     self.manifestUrl = manifestUrl
@@ -74,8 +72,6 @@ class _XmlRemote(object):
     self.reviewUrl = review
     self.revision = revision
     self.resolvedFetchUrl = self._resolveFetchUrl()
-    self.projecthookName = projecthookName
-    self.projecthookRevision = projecthookRevision
 
   def __eq__(self, other):
     return self.__dict__ == other.__dict__
@@ -171,11 +167,6 @@ class XmlManifest(object):
       e.setAttribute('review', r.reviewUrl)
     if r.revision is not None:
       e.setAttribute('revision', r.revision)
-    if r.projecthookName is not None:
-      ph = doc.createElement('projecthook')
-      ph.setAttribute('name', r.projecthookName)
-      ph.setAttribute('revision', r.projecthookRevision)
-      e.appendChild(ph)
 
   def _ParseGroups(self, groups):
     return [x for x in re.split(r'[,\s]+', groups) if x]
@@ -638,13 +629,7 @@ class XmlManifest(object):
     if revision == '':
       revision = None
     manifestUrl = self.manifestProject.config.GetString('remote.origin.url')
-    projecthookName = None
-    projecthookRevision = None
-    for n in node.childNodes:
-      if n.nodeName == 'projecthook':
-        projecthookName, projecthookRevision = self._ParseProjectHooks(n)
-        break
-    return _XmlRemote(name, alias, fetch, manifestUrl, review, revision, projecthookName, projecthookRevision)
+    return _XmlRemote(name, alias, fetch, manifestUrl, review, revision)
 
   def _ParseDefault(self, node):
     """
@@ -948,8 +933,3 @@ class XmlManifest(object):
       diff['added'].append(toProjects[proj])
 
     return diff
-
-  def _ParseProjectHooks(self, node):
-    name = self._reqatt(node, 'name')
-    revision = self._reqatt(node, 'revision')
-    return name, revision