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From Gmail <xunzhang...@gmail.com>
Subject Re: Replace git submodule with git clone + file with commit number?
Date Wed, 06 Jul 2016 11:35:30 GMT
I think the method using git clone is fine. 

But I suggest we'd better keep the makefile readable. I mean we should not add too trivial
shell logic inside makefile itself. For example, write a shell or Python script for users.
Users should run the script before building HAWQ if they need to install this libraries.

I also wonder what's the typical solution for similar problems of other Apache projects. Do
they use git sub module? How do they solve this in their release?


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> 在 2016年6月29日,18:18,Guo Gang <paulguo@gmail.com> 写道:
> I'm proposing this change because:
> 1) We are ready to release the first apache release with "source tarball",
> but
>   submodule is not friendly to source tarball since git submodule
>  require a git parent.
> 2) With more and more development, I found that submodule mechanism
>   is not that friendly for development, e.g.
>   If the commit number of one submodule is modified, it is hard to detect
>   this for Makefile. We need to manually update it in an old repo. If
>   using "git clone", we could easily detect update by set a commit number
> file
>   as dependency and thus easily update the code.
>  Some developers have complained the annoying output in "git status"
>  after building submodules. With "git clone" we can easily mask those
>  directories via .gitignore.
>  It is hard for developers who is not familiar with submodule (Frankly
> speaking
>  I really do not think submodule is friendly) to manipulate related
> directories
>  when necessary.
> While with the "git clone" solution, we save the commit of previous
> submodule in a file,
> and the related Makefile code change is rather simple, e.g. for gp-xerces.
> $(ORCA_BLD_PATH)/gp-xerces_prepare_timestamp:
> $(ORCA_SRC_PATH)/gp-xerces.commit
>   rm -f $(ORCA_BLD_PATH)/gp-xerces_prepare_timestamp
> gp-xerces_prepare: $(ORCA_BLD_PATH)/gp-xerces_prepare_timestamp
>   if [ ! -f $(ORCA_BLD_PATH)/gp-xerces_prepare_timestamp ]; then \
>       [ "x$(gp_xerces_commit)" != "x" ] || exit 1; \
>       cd $(abs_top_srcdir)/$(subdir); mkdir -p gp-xerces; cd gp-xerces; \
>       [ ! -d .git ] && git clone
> https://github.com/greenplum-db/gp-xerces.git .; \
>       git reset --hard $(gp_xerces_commit) || exit 2; \
>       touch $(ORCA_BLD_PATH)/gp_xerces_prepare_timestamp; \
>   fi
> With above code change, if I update gp-xerces commit number in the commit
> file
> gp-xerces.commit make will trigger an auto-build, If I messed up the
> gp-xerces directory
> I can easily remove the whole gp-xerces, or just remove the timestamp file
> gp-xerces_prepare_timestamp to trigger an auto build.
> Any suggestion? Thanks.

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