Re: [PATCH] submodule init: warn about falling back to a local path

> When a submodule is initialized, the config variable 
> 'submodule.<name>.url'
> is set depending on the value of the same variable in the .gitmodules
> file. When the URL indicates to be relative, then the url is computed
> relative to its default remote. The default remote cannot be determined
> accurately in all cases, such that it falls back to 'origin'.
>
> The 'origin' remote may not exist, though. In that case we give up looking
> for a suitable remote and we'll just assume it to be a local relative 
> path.
>
> This can be confusing to users as there is a lot of guessing involved,
> which is not obvious to the user.

>
> So in the corner case of assuming a local autoritative truth, warn the
> user to lessen the confusion.
>
> This behavior was introduced in 4d6893200 (submodule add: allow relative
> repository path even when no url is set, 2011-06-06), which shared the
> code with submodule-init and then ported to C in 3604242f080a (submodule:
> port init from shell to C, 2016-04-15).
>
> In case of submodule-add, this behavior makes sense in some use cases[1],
> however for submodule-init there does not seem to be an immediate obvious
> use case to fall back to a local submodule. However there might be, so
> warn instead of die here.
>
> [1] e.g. 
> http://stackoverflow.com/questions/8721984/git-ignore-files-for-public-repository-but-not-for-private
> "store a secret locally in a submodule, with no intention to publish it"
>
> Reported-by: Shawn Pearce <spearce@spearce.org>
> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---
> builtin/submodule--helper.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>