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From: Jonathan Tan <jonathantanmy@google.com>
To: sbeller@google.com
Cc: git@vger.kernel.org, jonathantanmy@google.com
Subject: Re: [PATCH 18/19] submodule: don't add submodule as odb for push
Date: Thu, 11 Oct 2018 16:00:28 -0700
Message-ID: <20181011230028.200488-1-jonathantanmy@google.com> (raw)
In-Reply-To: <20181011211754.31369-19-sbeller@google.com>

> The submodule was added as an alternative in eb21c732d6 (push: teach
> --recurse-submodules the on-demand option, 2012-03-29), but was
> not explained, why.
> 
> In similar code, submodule_has_commits, the submodule is added as an
> alternative to perform a quick check if we need to dive into the submodule.
> 
> However in push_submodule
> (a) for_each_remote_ref_submodule will also provide the quick check and
> (b) after that we don't need to have submodule objects around, as all
>     further code is to spawn a separate process.

After some investigation, I think I understand. I would explain it this
way:

  In push_submodule(), because we do not actually need access to objects
  in the submodule, do not invoke add_submodule_odb().
  (for_each_remote_ref_submodule() does not require access to those
  objects, and the actual push is done by spawning another process,
  which handles object access by itself.)

I'm not sure if it's worth mentioning the commit in which the call was
introduced, since nothing seems to have changed between then and now
(the same bug is present when it was introduced, and now).

I also checked the users of push_submodule() (transport_push()) and
indeed it doesn't seem to make use of the additional objects brought in
by add_submodule_odb().

Do you know if pushing of submodules is exercised by any test?

Other than that, the code itself looks good.

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-11 21:17 [RFC PATCH 00/19] Bring more repository handles into our code base Stefan Beller
2018-10-11 21:17 ` [PATCH 01/19] sha1_file: allow read_object to read objects in arbitrary repositories Stefan Beller
2018-10-11 21:17 ` [PATCH 02/19] packfile: allow has_packed_and_bad to handle " Stefan Beller
2018-10-11 21:17 ` [PATCH 03/19] object-store: allow read_object_file_extended to read from " Stefan Beller
2018-10-11 21:58   ` Jonathan Tan
2018-10-11 21:17 ` [PATCH 04/19] object-store: prepare read_object_file to deal with " Stefan Beller
2018-10-11 22:01   ` Jonathan Tan
2018-10-11 22:02     ` Stefan Beller
2018-10-11 21:17 ` [PATCH 05/19] object: parse_object to honor its repository argument Stefan Beller
2018-10-11 22:11   ` Jonathan Tan
2018-10-13  0:00     ` Stefan Beller
2018-10-11 21:17 ` [PATCH 06/19] commit: allow parse_commit* to handle arbitrary repositories Stefan Beller
2018-10-11 21:17 ` [PATCH 07/19] commit.c: allow paint_down_to_common " Stefan Beller
2018-10-11 21:17 ` [PATCH 08/19] commit.c: allow merge_bases_many " Stefan Beller
2018-10-11 21:17 ` [PATCH 09/19] commit.c: allow remove_redundant " Stefan Beller
2018-10-11 21:17 ` [PATCH 10/19] commit: allow get_merge_bases_many_0 " Stefan Beller
2018-10-11 21:17 ` [PATCH 11/19] commit: prepare get_merge_bases " Stefan Beller
2018-10-11 21:17 ` [PATCH 12/19] commit: prepare get_commit_buffer " Stefan Beller
2018-10-11 21:17 ` [PATCH 13/19] commit: prepare in_merge_bases[_many] " Stefan Beller
2018-10-11 21:17 ` [PATCH 14/19] commit: prepare repo_unuse_commit_buffer " Stefan Beller
2018-10-11 21:17 ` [PATCH 15/19] commit: prepare logmsg_reencode " Stefan Beller
2018-10-11 21:17 ` [PATCH 16/19] pretty: prepare format_commit_message " Stefan Beller
2018-10-11 22:22   ` Jonathan Tan
2018-10-11 21:17 ` [PATCH 17/19] submodule: use submodule repos for object lookup Stefan Beller
2018-10-11 22:40   ` Jonathan Tan
2018-10-13  0:20     ` Stefan Beller
2018-10-16 19:30     ` Stefan Beller
2018-10-16 23:13       ` Jonathan Tan
2018-10-16 23:16         ` Stefan Beller
2018-10-11 21:17 ` [PATCH 18/19] submodule: don't add submodule as odb for push Stefan Beller
2018-10-11 23:00   ` Jonathan Tan [this message]
2018-10-11 23:09     ` Stefan Beller
2018-10-11 21:17 ` [PATCH 19/19] Apply semantic patches from previous patches Stefan Beller
2018-10-11 23:07 ` [RFC PATCH 00/19] Bring more repository handles into our code base Jonathan Tan
2018-10-11 23:31 ` Junio C Hamano
2018-10-12 18:50 ` Jonathan Nieder
2018-10-13  0:30   ` Stefan Beller

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