Re: [ PATCH v2 1/2] Readme.md: add submodule policy and clone commands

["Leif Lindholm" <leif.lindholm@linaro.org>]

On Wed, Jul 10, 2019 at 02:09:54PM +0800, Jian J Wang wrote:
> > v2: update wording per Leif's and others' comments

Please drop the above line - version comments can go below the ---
line, so they don't get included in the commit message.

With that:
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

(although Liming had some further feedback)

> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1910
> 
> A section 'Submodules' is added to clarify the submodule policy
> in edk2 repo. Git commands are also added to show the correct
> way to clone submodule repos, in which '--recursive' is removed
> because it's not needed but recommended in other document.
> 
> Related commits:
> Openssl-1.1.1b upgrade: acfb90911840c38a0beb9bcfe0065668244d2b4d
> berkeley-softfloat-3:   3cc57695df5a6e8c65fb46b993836c315cabf49d
> 
> Cc: Leif Lindholm <leif.lindholm@linaro.org>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> ---
>  Readme.md | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/Readme.md b/Readme.md
> index e564c6c09b..c475468655 100644
> --- a/Readme.md
> +++ b/Readme.md
> @@ -143,3 +143,31 @@ Signed-off-by: Contributor Name <contributor@example.com>
>    the change.  Each line should be less than ~70 characters.
>  * `Signed-off-by` is the contributor's signature identifying them
>    by their real/legal name and their email address.
> +
> +# Submodules
> +
> +As a general policy, submodule chain should be avoided in EDK II repo
> +as possible as we can. Currently EDK II  contains two submodules
> +
> +- CryptoPkg/Library/OpensslLib/openssl
> +- ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3
> +
> +The latter one is actually required by previous one. It's inevitable
> +in openssl-1.1.1 (since stable201905) for floating point parameter
> +conversion, but should be dropped once there's no such need in future
> +release of openssl.
> +
> +To get a full, buildable EDK II repository, use following two steps
> +of git command
> +
> +```
> +$ git clone https://github.com/tianocore/edk2.git
> +$ git submodule update --init
> +```
> +
> +Note: When cloning submodule repos, '--recursive' option is not
> +recommended. EDK II itself will not use any code/feature from
> +submodules in above submodules. So using '--recursive' adds a
> +dependency on being able to reach servers we do not actually want
> +any code from, as well as needlessly downloading code we will not
> +use.
> -- 
> 2.17.1.windows.2
>