Re: [GSoC][PATCH v5 1/3] submodule: fix buggy $path and $sm_path variable's value

> According to the documentation about git-submodule foreach subcommand's
> $path variable:
> $path is the name of the submodule directory relative to the superproject
> 
> But it was observed when the value of the $path value deviates from this
> for the nested submodules when the <command> is run from a subdirectory.
> This patch aims for its correction.
> 
> Mentored-by: Christian Couder <christian.couder@gmail.com>
> Mentored-by: Stefan Beller <sbeller@google.com>
> Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
> ---
> This series of patch is based on gitster/jk/bug-to-abort for untilizing its 
> BUG() macro.
> 
> The observation made was as follows:
> For a project - super containing dir (not a submodule) and a submodule sub 
> which contains another submodule subsub. When we run a command from super/dir:
> 
> git submodule foreach "echo \$path-\$sm_path"
> 
> actual results:
> Entering '../sub'
> ../sub-../sub
> Entering '../sub/subsub'
> ../subsub-../subsub
> 
> expected result wrt documentation and current test suite:
> Entering '../sub'
> sub-../sub
> Entering '../sub/subsub'
> subsub-../sub/subsub
> 
> This make the value of $path confusing and I also feel it deviates from its 
> documentation:
> $path is the name of the submodule directory relative to the superproject.
> Hence, this patch corrects the value assigned to the $path and $sm_path.
> 
>  git-submodule.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/git-submodule.sh b/git-submodule.sh
> index c0d0e9a4c..ea6f56337 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -344,9 +344,9 @@ cmd_foreach()
>  				prefix="$prefix$sm_path/"
>  				sanitize_submodule_env
>  				cd "$sm_path" &&
> -				sm_path=$(git submodule--helper relative-path "$sm_path" "$wt_prefix") &&
>  				# we make $path available to scripts ...
>  				path=$sm_path &&
> +				sm_path=$displaypath &&
>  				if test $# -eq 1
>  				then
>  					eval "$1"
>