On 2020-05-07 at 23:12:09, Alexander Mills wrote:
> so it would be:
> 
> feature_branch='my_branch'  # the branch that I want to ensure is
> completely merged into origin/dev
> git merge-base  origin/dev --is-ancestor "$feature_branch"
> 
> that won't work?  since git merge-base only works with current branch?

No, that's not the case.  You can write this:

  git merge-base --is-ancestor $feature_branch origin/dev

This works from any branch and exits 0 if the branch is in origin/dev
and 1 if it is not.  In neither case does it print anything.
-- 
brian m. carlson: Houston, Texas, US
OpenPGP: https://keybase.io/bk2204