Re: [PATCH] push: do not add submodule odb as an alternate when recursing on demand

[Jonathan Nieder <jrnieder@gmail.com>]

Stefan Beller wrote:

> "git push --recurse-submodules=on-demand" adds each submodule as an
> alternate with add_submodule_odb before checking whether the
> submodule has anything to push and pushing it if so.
>
> However, it never accesses any objects from the submodule.  In the
> parent process it uses the submodule's ref database to see if there
> is anything to push.  The actual push (which does rely on objects)
> occurs in a child process.
>
> The same was true when this call was originally added in
> v1.7.11-rc0~111^2 (push: teach --recurse-submodules the on-demand
> option, 2012-03-29).  Most likely it was added by analogy with
> fetch --recurse-submodules=on-demand, which did use the submodule's
> object database.
>
> Use is_submodule_populated_gently instead, which is simpler and
> cheaper.
>
> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---
>  submodule.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>

Thanks for picking up this loose end.

> diff --git a/submodule.c b/submodule.c
> index 111a3007fc..e20216bc0f 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -966,7 +966,9 @@ static int push_submodule(const char *path,
>  			  const struct string_list *push_options,
>  			  int dry_run)
>  {
> -	if (add_submodule_odb(path))
> +	int code;
> +
> +	if (!is_submodule_populated_gently(path, &code))
>  		return 1;
>  
>  	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {