Using git version 2.3.8 (Apple Git-58), when I try to clone a repository with 
submodules using option --depth 1, I get two different behaviors for two 
different commands:

# 1 - using git clone --recursive directly (OK)
# repository last ref is cloned as well as its submodules
$ git submodule clone git://repository --depth 1 --recursive 

# 2 - using git clone then git submodule update (KO)
# repository is cloned, then submodules are cloned too but an invalid reference 
is fetched leading to "fatal: reference is not a tree: <submodule ref>"
$ git submodule clone git://repository --depth 1
$ cd repository
$ git submodule update --init --recursive --depth 1 #error 

I am wondering if the second scenario has the intended behavior, or if it 
should behave as the first solution. 

If this is the intented behavior, is it possible to retrieve a shallow version 
of submodules within an existing git repository, or the only solution is to 
clone the whole project with --depth 1 option?

Thanks, --
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