repo download: add --ff-only option

Allows to ff-only a gerrit patch
This patch is necessary to automatically ensure that the patch will
be correctly submitted on ff-only gerrit projects

You can now use:
repo download (--ff-only|-f) project changeid/patchnumber

This is useful to automate verification of fast forward status of a patch
in the context of build automation, and commit gating (e.g. buildbot)

Change-Id: I403a667557a105411a633e62c8eec23d93724b43
Signed-off-by: Erwan Mahe <erwan.mahe@intel.com>
Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/project.py b/project.py
index 1b0769a6..65fefd92 100644
--- a/project.py
+++ b/project.py
@@ -1670,8 +1670,10 @@ class Project(object):
     if GitCommand(self, cmd).Wait() != 0:
       raise GitError('%s rebase %s ' % (self.name, upstream))
 
-  def _FastForward(self, head):
+  def _FastForward(self, head, ffonly=False):
     cmd = ['merge', head]
+    if ffonly:
+      cmd.append("--ff-only")
     if GitCommand(self, cmd).Wait() != 0:
       raise GitError('%s merge %s ' % (self.name, head))