RE: git submodule update --remote fails on non-master branches with shallow clones enabled

Hi,

I am experiencing a problem with git submodules: git cannot update submodules from remote when using a non-master branch and shallow clones.

Tested git versions

client: 2.13 (Windows) server: 2.10 (CentOS 7)

Behaviour

when I have a submodule that is configured to get updates from a non-master branch and, at the same time, shallow clones are enabled, "git submodule update --remote" fails.

Example configuration in .gitmodules:

[submodule "webapi"]
               path = webapi
               url = ../../api/web-api.git
               branch = release/2.1
               shallow = true
               
The error message is:

fatal: Needed a single revision Unable to find current origin/release/2.1 revision in submodule path 'webapi'

I think that the cause of this problem is the following: When this submodule is initialised initially, in ".git/modules/webapi/config" I can see that fetch is configured this way:

fetch = +refs/heads/master:refs/remotes/origin/master

That's probably why git cannot find my release/2.1 branch. The question is - why this happens despite the submodule is explicitly configured to use a non-master branch in .gitmodules?... 

NB For the remote git, I enabled both uploadpack.allowReachableSHA1InWant & uploadpack.allowTipSHA1InWant.

Kind regards, Maxim

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