Fixed weird race condition with cron cleanup of /tmp (such as tmpwatch).

Now, clone_or_pull_gitolite_admin() will refuse to merge in existing
changes (which could involve deletes from tmpwatch).  Instead, it will
recognize the unmerged changes and simply delete and reclone.

Note that such unmerged changes will not exist unless something bad
has happened.  Cleanup may require executing a RESYNC_ALL operation
(i.e. fetch_changesets).

lib/git_hosting.rb

@@ -407,7 +407,13 @@ def self.shell(command)
         # This routine must only be called after acquisition of the lock
        	#
        	# John Kubiatowicz, 11/15/11
-	def self.clone_or_pull_gitolite_admin
+        #
+        # This routine will no-longer merge in changes, since this can cause weird behavior
+        # when interacting with cron-jobs that clean up /tmp.
+        #
+        # John Kubiatowicz, 04/23/12
+        #
+	def self.clone_or_pull_gitolite_admin(resync_all_flag)
 		# clone/pull from admin repo
         	repo_dir = File.join(get_tmp_dir,GitHosting::GitoliteConfig::ADMIN_REPO)
 
@@ -421,10 +427,22 @@ def self.clone_or_pull_gitolite_admin
                           	# unmerged changes=> non-empty return
                           	return_val = %x[env GIT_SSH=#{gitolite_ssh()} git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' status --short].empty?
 
-                        	shell %[chmod 700 "#{repo_dir}" ]
-                		# Make sure we have our hooks setup
-				GitAdapterHooks.check_hooks_installed
-	                  	return return_val
+                          	if (return_val)
+                                	shell %[chmod 700 "#{repo_dir}" ]
+                			# Make sure we have our hooks setup
+					GitAdapterHooks.check_hooks_installed
+	                  		return return_val
+                                else
+                                	# The attempt to merge can cause a weird failure mode when interacting with cron jobs that clean out old
+                                	# files in /tmp.  The issue is that keys in the keydir can go idle and get deleted.  Then, when we merge we
+                                	# create an admin repo minus those keys (including the admin key!).  Only a RESYNC_ALL operation will
+                                	# actually fix.  Thus, we never return "have uncommitted changes", but instead fail the merge and reclone.
+                                	#
+                               		# 04/23/12
+                                	# --KUBI-- 
+                                	logger.error "Seems to be unmerged changes!  Going to delete and reclone for safety."
+                                	logger.error "May need to execute RESYNC_ALL to fix whatever caused pending changes." unless resync_all_flag
+                                end
                         rescue
                         	logger.error "Repository fetch and merge failed -- trying to delete and reclone repository."
                         end
@@ -537,7 +555,7 @@ def self.fixup_gitolite_admin
                 	shell %[#{GitHosting.git_user_runner} "git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' add conf/gitolite.conf"]
                 	shell %[#{GitHosting.git_user_runner} "git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' config user.email '#{Setting.mail_from}'"]
                 	shell %[#{GitHosting.git_user_runner} "git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' config user.name 'Redmine'"]
-                	shell %[#{GitHosting.git_user_runner} "git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' commit -m 'Emergency repair of gitolite admin key'"]
+                	shell %[#{GitHosting.git_user_runner} "git --git-dir='#{repo_dir}/.git' --work-tree='#{repo_dir}' commit -m 'Updated by Redmine: Emergency repair of gitolite admin key'"]
                 	begin
                         	logger.warn "  Pushing fixes using gl-admin-push"
                         	shell %[#{GitHosting.git_user_runner} "cd #{repo_dir}; gl-admin-push -f"]
@@ -670,7 +688,7 @@ def self.update_repositories(*args)
           	begin
                 	# Make sure we have gitoite-admin cloned. 
                  	# If have uncommitted changes, reflect in "changed" flag.
-			changed = !clone_or_pull_gitolite_admin
+			changed = !clone_or_pull_gitolite_admin(flags[:resync_all])
 
                		# Get directory for the gitolite-admin
        			repo_dir = File.join(get_tmp_dir,"gitolite-admin")