Using Git how to merge a subtree from remote branch

Subtrees in Git work nicely although some git commands remain to be supported for subtrees.

Here's the question:

How to make the subtree pull from a different remote branch like "stable" or "integrate"?

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FYI, we have a subtree "push" working as a script. In fact, it can even push the subtree to the specific branch of our choice on the remote repository.

Does anybody know how to do the reverse on a pull or even have a clue?

The simple pull works like this:

git pull -s subtree remotebranch

One idea that can be tried: Maybe a 2-step process will do the trick.

1. The remote branch开发者_StackOverflow中文版 gets pulled from remote repository branch like "stable" and then
2. do the git subtree pull to master?

Sincerely, Wayne

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May be (not tested) the git subtree script tool may help here.
See its man page

It can merge/pull a subproject in your own repo, but it may concern all branches, so your two-step process could still be needed.