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From: Stefan Beller <sbeller@google.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: git <git@vger.kernel.org>, Derrick Stolee <stolee@gmail.com>
Subject: Re: [RFC PATCH 0/2] Bring the_repository into cmd_foo
Date: Thu, 18 Oct 2018 16:23:23 -0700	[thread overview]
Message-ID: <CAGZ79kZ8ER_EkuAySzvybg1Y35MtjHPEU-AS9zhCivw==+RyiA@mail.gmail.com> (raw)
In-Reply-To: <20181018210119.149727-1-jonathantanmy@google.com>

On Thu, Oct 18, 2018 at 2:01 PM Jonathan Tan <jonathantanmy@google.com> wrote:
>
> > > Or instead we could accelerate the long term plan of removing a
> > > hard coded the_repository and have each cmd builtin take an additional
> > > repository pointer from the init code, such that we'd bring all of Git to
> > > work on arbitrary repositories. Then the standard test suite should be
> > > okay, as there is no special case for the_repository any more.
> >
> > Demo'd in this RFC series for git-merge-base.
> >
> > The core idea is found in patch 1,
> > and the proof of concept is found in patch 2.
>
> I don't think working around the_repository is sufficient, as there are
> other ways to access the same repository state (the_index, directly
> accessing files through file I/O).

Sure, but that would stick out like a sore thumb?

> Instead I would prefer a test like in
> t/test-repository.c - each patch set would probably only need one test
> for the last function converted, since typically the last function uses
> every other function converted.

I'll look into that.

>
> Also, even if we decided that working around the_repository is
> sufficient, I don't think this get_the_repository() is a good approach.
> If (or when) we decide to convert all builtins to not use
> the_repository, we would have to clean up all such calls.

Just like we have to cleanup the calls to the_repository or the_index
in general now (c.f. nd/the-index)

> Better would be to pass the_repository from the invoker of the cmd
> builtin, and reuse NO_THE_REPOSITORY_COMPATIBILITY_MACROS in the
> builtin. (I haven't thought much about how to transition to this, but
> one way might be to extend "struct cmd_struct" in git.c to also have a
> new-style function pointer, and #define GIT_CMD(c, f, o) {c, NULL, o, f}
> or something like that.)

This sounds like the next step to me.

> This doesn't directly address the fact that the builtin might call lib
> code that indirectly references the_repository, but I think that this
> won't be an issue because by the time we're ready to convert builtins to
> not use the_repository, most if not all of the lib code would have
> NO_THE_REPOSITORY_COMPATIBILITY_MACROS defined anyway.

And until then we double up on tests, one time the regular end-to-end tests
and additional tests for repository agnostic units in test-repository.c ?

The whole point of this approach is to keep the testing at the level
that we currently have and make the tests more powerful in doubling
for both (a) testing existing behavior, (b) getting fairly good coverage
of repository-fication of the code base by these 2 simple knobs.

  reply	other threads:[~2018-10-18 23:23 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-16 23:35 [PATCH 00/19] Bring more repository handles into our code base Stefan Beller
2018-10-16 23:35 ` [PATCH 01/19] sha1_file: allow read_object to read objects in arbitrary repositories Stefan Beller
2018-10-16 23:35 ` [PATCH 02/19] packfile: allow has_packed_and_bad to handle " Stefan Beller
2018-10-16 23:35 ` [PATCH 03/19] object-store: allow read_object_file_extended to read from " Stefan Beller
2018-10-16 23:35 ` [PATCH 04/19] object-store: prepare read_object_file to deal with " Stefan Beller
2018-10-16 23:35 ` [PATCH 05/19] object-store: prepare has_{sha1, object}_file[_with_flags] to handle " Stefan Beller
2018-10-16 23:35 ` [PATCH 06/19] object: parse_object to honor its repository argument Stefan Beller
2018-10-16 23:35 ` [PATCH 07/19] commit: allow parse_commit* to handle arbitrary repositories Stefan Beller
2018-10-16 23:35 ` [PATCH 08/19] commit-reach.c: allow paint_down_to_common " Stefan Beller
2018-10-16 23:35 ` [PATCH 09/19] commit-reach.c: allow merge_bases_many " Stefan Beller
2018-10-16 23:35 ` [PATCH 10/19] commit-reach.c: allow remove_redundant " Stefan Beller
2018-10-16 23:35 ` [PATCH 11/19] commit-reach.c: allow get_merge_bases_many_0 " Stefan Beller
2018-10-16 23:35 ` [PATCH 12/19] commit-reach: prepare get_merge_bases " Stefan Beller
2018-10-16 23:35 ` [PATCH 13/19] commit-reach: prepare in_merge_bases[_many] " Stefan Beller
2018-10-16 23:35 ` [PATCH 14/19] commit: prepare get_commit_buffer " Stefan Beller
2018-10-16 23:35 ` [PATCH 15/19] commit: prepare repo_unuse_commit_buffer " Stefan Beller
2018-10-16 23:35 ` [PATCH 16/19] commit: prepare logmsg_reencode " Stefan Beller
2018-10-16 23:35 ` [PATCH 17/19] pretty: prepare format_commit_message " Stefan Beller
2018-10-16 23:35 ` [PATCH 18/19] submodule: use submodule repos for object lookup Stefan Beller
2018-10-19 20:37   ` Jonathan Tan
2018-10-25  9:14   ` SZEDER Gábor
2018-10-31 13:38   ` Derrick Stolee
2018-11-01 19:13     ` Stefan Beller
2018-10-16 23:35 ` [PATCH 19/19] submodule: don't add submodule as odb for push Stefan Beller
2018-10-19 20:39   ` Jonathan Tan
2018-10-17 12:41 ` [PATCH 00/19] Bring more repository handles into our code base Derrick Stolee
2018-10-17 17:53   ` Stefan Beller
2018-10-18 18:37     ` [RFC PATCH 0/2] Bring the_repository into cmd_foo Stefan Beller
2018-10-18 18:37       ` [RFC PATCH 1/2] repository: have get_the_repository() to remove the_repository dependency Stefan Beller
2018-10-18 18:37       ` [RFC PATCH 2/2 (BREAKS BUILD)] builtin/merge-base.c: do not rely on the_repository any more Stefan Beller
2018-10-18 21:01       ` [RFC PATCH 0/2] Bring the_repository into cmd_foo Jonathan Tan
2018-10-18 23:23         ` Stefan Beller [this message]
2018-10-19  7:23 ` [PATCH 00/19] Bring more repository handles into our code base Junio C Hamano
2018-10-22 17:39 ` New semantic patches vs. in-flight topics [was: Re: [PATCH 00/19] Bring more repository handles into our code base] SZEDER Gábor
2018-10-22 18:54   ` Stefan Beller
2018-10-25  1:59     ` SZEDER Gábor
2018-10-25 19:25       ` Stefan Beller
2018-10-22 22:49   ` Junio C Hamano
2018-10-23  0:26     ` Stefan Beller
2018-10-23  4:24       ` Junio C Hamano
2018-10-23  9:38     ` Junio C Hamano
2018-10-23 10:15       ` Carlo Arenas
2018-10-23 10:21         ` Junio C Hamano
2018-10-23 17:30       ` Stefan Beller
2018-10-24  1:22         ` Junio C Hamano
2018-10-25  5:39   ` Jeff King

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