This builds on Chris Rorvick's earlier effort to forbid unforced
updates to refs/tags/ hierarchy and giving sensible error and advise
messages for that case (we are not rejecting such a push due to fast
forwardness, and suggesting to fetch and integrate before pushing
again does not make sense).

The main change is in the second patch.  When we

 * do not have the object at the tip of the remote;
 * the object at the tip of the remote is not a commit; or
 * the object we are pushing is not a commit,

there is no point suggesting to fetch, integrate and push again.

If we do not have the current object at the tip of the remote, we
should tell the user to fetch first and evaluate the situation
before deciding what to do next.

Otherwise, if the current object is not a commit, or if we are
trying to push an object that is not a commit, then the user does
not have to fetch first (we already have the object), but it still
does not make sense to suggest to integrate and re-push.  Just tell
them that such a push requires a force in such a case.

Junio C Hamano (3):
  push: further clean up fields of "struct ref"
  push: further reduce "struct ref" and simplify the logic

 advice.c            |  4 ++++
 advice.h            |  2 ++
 builtin/push.c      | 25 +++++++++++++++++++++++++
 builtin/send-pack.c | 10 ++++++++++
 cache.h             |  6 +++---
 remote.c            | 38 ++++++++++++++++----------------------
 send-pack.c         |  2 ++
 transport-helper.c  | 10 ++++++++++
 transport.c         | 14 +++++++++++++-
 transport.h         |  2 ++
 10 files changed, 87 insertions(+), 26 deletions(-)


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