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From: Brandon Williams <bmwill@google.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, sbeller@google.com
Subject: Re: [PATCH 2/3] setup: have the_repository use the_index
Date: Wed, 12 Jul 2017 11:01:43 -0700	[thread overview]
Message-ID: <20170712180143.GD65927@google.com> (raw)
In-Reply-To: <xmqqzica1pli.fsf@gitster.mtv.corp.google.com>

On 07/11, Junio C Hamano wrote:
> Brandon Williams <bmwill@google.com> writes:
> 
> > Have the index state which is stored in 'the_repository' be a pointer to
> > the in-core instead 'the_index'.  This makes it easier to begin
> > transitioning more parts of the code base to operate on a 'struct
> > repository'.
> >
> > Signed-off-by: Brandon Williams <bmwill@google.com>
> > ---
> >  setup.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/setup.c b/setup.c
> > index 860507e1f..b370bf3c1 100644
> > --- a/setup.c
> > +++ b/setup.c
> > @@ -1123,6 +1123,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
> >  			setup_git_env();
> >  		}
> >  	}
> > +	the_repository->index = &the_index;
> >  
> >  	strbuf_release(&dir);
> >  	strbuf_release(&gitdir);
> 
> I would have expected this to be going in the different direction,
> i.e. there is an embedded instance of index_state in a repository
> object, and the_repository.index is defined to be the old the_index,
> i.e.
> 
> 	#define the_index (the_repository.index)
> 
> When a Git command that recurses into submodules in-core using
> the_repository that represents the top-level superproject and
> another repository object tht represents a submodule, don't we want
> the repository object for the submodule also have its own default
> index without having to allocate one and point at it with the index
> field?

For all intents and purposes the index struct that is stored in 'struct
repository' is an embedded instance, its just stored as a pointer
instead of being a direct part of the struct itself.  As far as
submodules are concerned, thats why 'repo_read_index' exists since it
will allocate the index struct if needed and then populate it with the
index file associated with that repository.  So the 'struct repository'
owns that instance of 'struct index_state'.

Since it is a pointer then using a '#define' to replace 'the_index'
(which is not a pointer) would be a little more challenging.

> 
> I dunno.  Being able to leave the index field NULL lets you say
> "this is a bare repository and there is no place for the index file
> for it", but even if we never write out the in-core index to an
> index file on disk, being able to populate the in-core index that is
> default for the repository object from a tree-ish and iterating over
> it (e.g.  running in-core merge of trees) is a useful thing to do,
> so I do not consider "index field can be set to NULL to signify a
> bare repository" a very strong plus.
> 

I'd probably say that we'd eventually need a bit field in 'struct
repository' which indicates if a repository is bare.  I think we already
have a global variable somewhere which stores this sort of information.

-- 
Brandon Williams

  reply	other threads:[~2017-07-12 18:01 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-11 22:04 [PATCH 0/3] Convert grep to recurse in-process Brandon Williams
2017-07-11 22:04 ` [PATCH 1/3] repo_read_index: don't discard the index Brandon Williams
2017-07-11 23:51   ` Jonathan Nieder
2017-07-12 17:27     ` Brandon Williams
2017-07-11 23:58   ` Stefan Beller
2017-07-12 17:23     ` Brandon Williams
2017-07-11 22:04 ` [PATCH 2/3] setup: have the_repository use the_index Brandon Williams
2017-07-12  0:00   ` Jonathan Nieder
2017-07-12  0:07     ` Stefan Beller
2017-07-12 17:30     ` Brandon Williams
2017-07-12  0:11   ` Junio C Hamano
2017-07-12 18:01     ` Brandon Williams [this message]
2017-07-12 20:38       ` Junio C Hamano
2017-07-12 21:33         ` Jonathan Nieder
2017-07-12 21:40           ` Junio C Hamano
2017-07-18 21:34             ` Junio C Hamano
2017-07-11 22:04 ` [PATCH 3/3] grep: recurse in-process using 'struct repository' Brandon Williams
2017-07-11 22:44   ` Jacob Keller
2017-07-12 18:54     ` Brandon Williams
2017-07-12  0:04   ` Stefan Beller
2017-07-12 18:56     ` Brandon Williams
2017-07-12  0:25   ` Jonathan Nieder
2017-07-12 18:49     ` Brandon Williams
2017-07-12  7:42 ` [PATCH 0/3] Convert grep to recurse in-process Jeff King
2017-07-12 18:06   ` Brandon Williams
2017-07-12 18:17     ` Jeff King
2017-07-12 18:24       ` Jonathan Nieder
2017-07-12 18:33         ` Jeff King
2017-07-12 18:09   ` Jonathan Nieder
2017-07-12 18:17     ` Stefan Beller
2017-07-12 18:27     ` Jeff King
2017-07-14 22:28 ` [PATCH v2 " Brandon Williams
2017-07-14 22:28   ` [PATCH v2 1/3] repo_read_index: don't discard the index Brandon Williams
2017-07-14 22:28   ` [PATCH v2 2/3] repository: have the_repository use the_index Brandon Williams
2017-07-14 22:28   ` [PATCH v2 3/3] grep: recurse in-process using 'struct repository' Brandon Williams
2017-07-18 19:05   ` [PATCH v3 00/10] Convert grep to recurse in-process Brandon Williams
2017-07-18 19:05     ` [PATCH v3 01/10] repo_read_index: don't discard the index Brandon Williams
2017-07-18 19:05     ` [PATCH v3 02/10] repository: have the_repository use the_index Brandon Williams
2017-07-18 19:05     ` [PATCH v3 03/10] cache.h: add GITMODULES_FILE macro Brandon Williams
2017-07-31 23:11       ` [PATCH] convert any hard coded .gitmodules file string to the MACRO Stefan Beller
2017-08-01 13:14         ` Jeff Hostetler
2017-08-01 17:35           ` Stefan Beller
2017-08-01 20:26             ` Junio C Hamano
2017-08-02 17:26               ` Brandon Williams
2017-08-02 17:46               ` Brandon Williams
2017-07-18 19:05     ` [PATCH v3 04/10] config: add config_from_gitmodules Brandon Williams
2017-07-18 19:05     ` [PATCH v3 05/10] submodule: remove submodule.fetchjobs from submodule-config parsing Brandon Williams
2017-07-18 19:05     ` [PATCH v3 06/10] submodule: remove fetch.recursesubmodules " Brandon Williams
2017-07-18 19:05     ` [PATCH v3 07/10] submodule: check for unstaged .gitmodules outside of config parsing Brandon Williams
2017-07-31 23:41       ` Stefan Beller
2017-08-02 17:41         ` Brandon Williams
2017-08-02 18:00           ` Brandon Williams
2017-07-18 19:05     ` [PATCH v3 08/10] submodule: check for unmerged " Brandon Williams
2017-07-18 19:05     ` [PATCH v3 09/10] submodule: merge repo_read_gitmodules and gitmodules_config Brandon Williams
2017-07-18 19:05     ` [PATCH v3 10/10] grep: recurse in-process using 'struct repository' Brandon Williams
2017-07-18 19:36     ` [PATCH v3 00/10] Convert grep to recurse in-process Junio C Hamano
2017-07-18 20:06       ` Brandon Williams
2017-08-02 19:49     ` [PATCH v4 " Brandon Williams
2017-08-02 19:49       ` [PATCH v4 01/10] repo_read_index: don't discard the index Brandon Williams
2017-08-02 19:49       ` [PATCH v4 02/10] repository: have the_repository use the_index Brandon Williams
2017-08-02 19:49       ` [PATCH v4 03/10] cache.h: add GITMODULES_FILE macro Brandon Williams
2017-08-02 19:49       ` [PATCH v4 04/10] config: add config_from_gitmodules Brandon Williams
2017-08-02 19:49       ` [PATCH v4 05/10] submodule: remove submodule.fetchjobs from submodule-config parsing Brandon Williams
2017-08-02 19:49       ` [PATCH v4 06/10] submodule: remove fetch.recursesubmodules " Brandon Williams
2017-08-02 19:49       ` [PATCH v4 07/10] submodule: check for unstaged .gitmodules outside of config parsing Brandon Williams
2017-08-02 19:49       ` [PATCH v4 08/10] submodule: check for unmerged " Brandon Williams
2017-08-02 19:49       ` [PATCH v4 09/10] submodule: merge repo_read_gitmodules and gitmodules_config Brandon Williams
2017-08-02 19:49       ` [PATCH v4 10/10] grep: recurse in-process using 'struct repository' Brandon Williams

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