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Date:   Tue, 11 Sep 2018 15:05:19 -0400
From:   Jeff King <peff@peff.net>
To:     Michal Novotny <clime@redhat.com>
Cc:     git@vger.kernel.org
Subject: Re: with git 1.8.3.1 get only merged tags
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On Tue, Sep 11, 2018 at 12:43:15PM +0200, Michal Novotny wrote:

> I need to emulate git tag --merged with very old git 1.8.3.1. Is that
> somehow possible?
> I am looking for a bash function that would take what git 1.8.3.1
> offers and return only the tags accessible from the current branch
> tip. Could you, please, give me at least a hint how this could be
> done?

This is not particularly fast, but it should work:

  git for-each-ref refs/tags |
  cut -f2 |
  while read tag; do
    test "$(git merge-base $tag HEAD)" = \
         "$(git rev-parse $tag^{commit})" && echo $tag
  done

-Peff