[PATCH v4 0/5] push: update remote tags only with force

This patch set can be divided into two sets:

  1. Provide useful advice for rejected tag references.

     push: return reject reasons via a mask
     push: add advice for rejected tag reference

     Recommending a merge to resolve a rejected tag update seems
     nonsensical since the tag does not come along for the ride.  These
     patches change the advice for rejected tags to suggest using
     "push -f".

  2. Require force when updating tag references, even on a fast-forward.

     push: flag updates
     push: flag updates that require force
     push: update remote tags only with force

     This is in response to the following thread:

       http://thread.gmane.org/gmane.comp.version-control.git/208354

     This solution prevents fast-forwards if the reference is of the
     refs/tags/* hierarchy or if the old object is not a commit.

These patches contain the following updates since the v3 set:

  * builtin/push.c: Remove "push --force" suggestion from advice.
  * remote.c: Only require old object to be a commit to be forwardable.
      I added the check for object types based comments from Peff in
      original thread, and I think this implementation is actually what
      he intended.  If the new object is a tag, the operation is not
      destructive so there is no reason to block it (at least within
      the scope of these changes) as was done in the previous iteration.
  * t/t5516-fetch-push.sh: Create separate tests for the lightweight and
      annotated cases.  Do the annotated tests outside of refs/tags/
      so that it actually tests different functionality.

Chris Rorvick (5):
  push: return reject reasons via a mask
  push: add advice for rejected tag reference
  push: flag updates
  push: flag updates that require force
  push: update remote tags only with force

 Documentation/git-push.txt | 10 +++++-----
 builtin/push.c             | 24 +++++++++++++++---------
 builtin/send-pack.c        |  9 +++++++--
 cache.h                    |  7 ++++++-
 remote.c                   | 46 ++++++++++++++++++++++++++++++++++++----------
 send-pack.c                |  1 +
 t/t5516-fetch-push.sh      | 30 +++++++++++++++++++++++++++++-
 transport-helper.c         |  6 ++++++
 transport.c                | 25 +++++++++++++++----------
 transport.h                | 10 ++++++----
 10 files changed, 126 insertions(+), 42 deletions(-)