From: Uma Srinivasan <usrinivasan@twitter.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Jacob Keller <jacob.keller@gmail.com>,
Git Mailing List <git@vger.kernel.org>,
Jens Lehmann <Jens.Lehmann@web.de>,
Heiko Voigt <hvoigt@hvoigt.net>,
Stefan Beller <sbeller@google.com>
Subject: Re: git submodules implementation question
Date: Wed, 31 Aug 2016 11:40:03 -0700 [thread overview]
Message-ID: <CAN5XQfvK7M5eSkMfz5iRTnE_va9VGjONAPO5hmF+iQg-i3XEpQ@mail.gmail.com> (raw)
In-Reply-To: <xmqq7faw3n5w.fsf@gitster.mtv.corp.google.com>
FWIW, I tried the following quick change based on the info. provided
by Junio and it seems to "fix" my original problem. I'll let you
experts figure out if we need a more complete fix or not.
diff --git a/submodule.c b/submodule.c
index 5a62aa2..23443a7 100644
--- a/submodule.c
+++ b/submodule.c
@@ -960,6 +960,9 @@ unsigned is_submodule_modified(const char *path,
int ignore_untracked)
return 0;
}
+ /* stuff submodule git dir into env var */
+ set_git_dir(git_dir);
+
strbuf_reset(&buf);
if (ignore_untracked)
@@ -1279,5 +1282,9 @@ void prepare_submodule_repo_env(struct argv_array *out)
for (var = local_repo_env; *var; var++) {
if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
argv_array_push(out, *var);
+ if (strcmp(*var, GIT_DIR_ENVIRONMENT))
+ argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
+ get_git_dir());
}
+
}
Thanks,
Uma
On Wed, Aug 31, 2016 at 9:42 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Uma Srinivasan <usrinivasan@twitter.com> writes:
>
>>> I might suggest to update prepare_submodule_repo_env() so that the
>>> spawned process will *NOT* have to guess where the working tree and
>>> repository by exporting GIT_DIR (set to "git_dir" we discover above)
>>> and GIT_WORK_TREE (set to "." as cp.dir is set to the path to the
>>> working tree of the submodule). That would stop the "git status" to
>>> guess (and fooled by a corrupted dir/.git that is not a git
>>> repository).
>>
>> Here's where I am struggling with my lack of knowledge of git
>> internals and the implementation particularly in the context of how
>> environment variables are passed from the parent to the child process.
>
> Ah, I was primarily addressing Jacob in the latter part of my
> message, as he's looked at similar things in his recent topic.
>
>> Are you suggesting that we set up the child process environment array
>> (the "out" argument) in prepare_submodule_repo_env() to include
>> GIT_DIR_ENVIRONMENT and GIT_WORK_TREE_ENVIRONMENT in addition to
>> CONFIG_DATA_ENVIRONMENT that is there now?
>
> I was wondering if we should unconditionally stuff GIT_DIR=<the
> repository location for the submodule> in the cp.env_array passed to
> the function prepare_submodule_repo_env(). As cp.dir will be set to
> the submodule's working tree, there is no need to set GIT_WORK_TREE
> and export it, I think, although it would not hurt.
>
> After all, we _are_ going into a separate and different project's
> repository (that is what a submodule is), and we _know_ where its
> repository data (i.e. GIT_DIR) and the location of its working tree
> (i.e. GIT_WORK_TREE). There is no reason for the process that will
> work in the submodule to go through the usual "do we have .git in
> our $cwd that is a repository? if not how about the parent directory
> of $cwd? go up until we find one and that directory is the top of
> the working tree" discovery.
>
> More importantly, this matters when your GIT_DIR for the submodule
> is somehow corrupt. The discovery process would say "there is .git
> in $cwd but that is not a repository" and continue upwards, which
> likely would find the repository for the top-level superproject,
> which definitely is _not_ want you want to happen. And one way to
> avoid it is to tell the setup.c code that it should not do the
> discovery by being explicit.
>
next prev parent reply other threads:[~2016-08-31 18:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-28 23:24 git submodules implementation question Uma Srinivasan
2016-08-29 20:03 ` Junio C Hamano
2016-08-29 21:03 ` Uma Srinivasan
2016-08-29 21:09 ` Junio C Hamano
2016-08-29 21:13 ` Uma Srinivasan
2016-08-29 23:04 ` Uma Srinivasan
2016-08-29 23:15 ` Junio C Hamano
2016-08-29 23:34 ` Uma Srinivasan
2016-08-30 0:02 ` Jacob Keller
2016-08-30 0:12 ` Uma Srinivasan
2016-08-30 6:09 ` Jacob Keller
2016-08-30 6:23 ` Jacob Keller
2016-08-30 17:40 ` Uma Srinivasan
2016-08-30 17:53 ` Junio C Hamano
2016-08-31 2:54 ` Uma Srinivasan
2016-08-31 16:42 ` Junio C Hamano
2016-08-31 18:40 ` Uma Srinivasan [this message]
2016-08-31 18:44 ` Junio C Hamano
2016-08-31 18:58 ` Uma Srinivasan
2016-09-01 1:04 ` Uma Srinivasan
2016-09-01 4:09 ` Junio C Hamano
2016-09-01 16:05 ` Uma Srinivasan
2016-09-01 18:32 ` Junio C Hamano
2016-09-01 18:37 ` Stefan Beller
2016-09-01 19:19 ` Junio C Hamano
2016-09-01 19:56 ` Uma Srinivasan
2016-09-01 20:29 ` Junio C Hamano
2016-09-01 20:21 ` Junio C Hamano
2016-09-01 21:02 ` Junio C Hamano
2016-09-01 21:04 ` Stefan Beller
2016-09-01 21:12 ` Junio C Hamano
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