Questions about repo and git submodule

> 
> I have some questions about android repo and git submodule.
> 
> I created a repo repository with below commands:
> 1.  repo init -u git://android.git.kernel.org/platform/manifest.git
> 2.  repo initialized in /android
> 
> 1. The android dir is not a git repository,

> Emily Ren <lingyan.ren@gmail.com> wrote:
>>
>> I have some questions about android repo and git submodule.
>>
>> I created a repo repository with below commands:
>> 1.  repo init -u git://android.git.kernel.org/platform/manifest.git
>> 2.  repo initialized in /android
>>
>> 1. The android dir is not a git repository,
>
> Correct, it is not a git repository.  The repo tool does not use
> git submodules.  The top level of a repo client has a ".repo/"
> directory with metadata, not a ".git/" directory.  The table of
> contents (the subprojects) is stored in XML files under ".repo/".
>
> <aside>
> I actually fought against the XML format for repo's manifest, but
> others felt it was suitable.  And then walked away from the project
> after Android open-sourced its code tree.  Leaving me to maintain it.
> I see a file format simplification in the future for repo.
> </aside>
>
>> if other people clone my
>> android code, how does it work?
>
> Sadly this isn't supported correctly.  You can't initialize one
> repo client from another, even though you can git clone one git
> repository from any other.  Its a bug in repo's design.  The data
> under ".repo/projects/" isn't laid out correctly to permit reuse
> of one repo client to initialize another.
>
> Its something I keep meaning to fix, but its going to take some
> real effort.
>
> In the mean time, there is a "--mirror" flag to repo init
> which can be used to clone everything into bare repositories.
> Those bare repositories can be published for others to repo init
> from, though you need to customize the manifest.git:default.xml
> so that the embedded URL refers back to your server and not
> android.git.kernel.org.  Yet another thing I want to fix.
>
>> 2. I want to make android dir to be a git repository, is it workable
>> that I create submodule for each subdirectory in another directory? Is
>> there a script for it?
>
> You might be able to do something like this:
>
>        cd /android
>        git init
>        repo forall -c 'cd /android && git submodule add `pwd`'
>
> Also, you might want to consider asking questions related to repo
> on the repo-discuss@googlegroups.com mailing list.  There's a lot
> more repo users there than on the git mailing list, and they have
> started to come up with their own "tips n tricks".
>
> --
> Shawn.
>

> Thank you for your guide ! I've created git repository with submodules
> with a simple script successfully.
> 
> Now I have another question,  since my android repo will always sync
> up from android.git.kernel.org, my git repository needs to be updated
> accordingly.  Is there a tool I can use to sync up from repo to git
> repositoy ?