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From: Stefan Beller <>
To: Yaroslav Halchenko <>
Cc: Prathamesh Chavan <>, "" <>
Subject: Re: in case you want a use-case with lots of submodules
Date: Mon, 19 Jun 2017 22:43:37 -0700
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, Jun 19, 2017 at 1:20 PM, Yaroslav Halchenko <> wrote:
> On Mon, 19 Jun 2017, Stefan Beller wrote:
>> On Mon, Jun 19, 2017 at 8:59 AM, Yaroslav Halchenko <> wrote:
>> > Hi All,
>> > On a recent trip I've listened to the git minutes podcast episode and
>> > got excited to hear  Stefan Beller (CCed just in case) describing
>> > ongoing work on submodules mechanism.  I got excited, since e.g.
>> > performance improvements would be of great benefit to us too.
>> If you're mostly interested in performance improvements of the status
>> quo (i.e. "make git-submodule fast"), then the work of Prathamesh
>> Chavan (cc'd) might be more interesting to you than what I do.
>> He is porting git-submodule (which is mostly a shell script nowadays)
>> to C, such that we can save a lot of process invocations and can do
>> processing within one process.
> ah -- cool.  I would be eager to test it out, thanks!  would be
> interesting to see if it positively affects our overall performance.
> Pointers to that development would be welcome!

The latest from today:

>> > ATM provides quite a sizeable (ATM 370
>> > repositories, up to 4 levels deep) hierarchy of git/git-annex
>> > repositories all tied together via git submodules mechanism.  And as the
>> > collection grows, interactions with it become slower, so additional
>> > options (such as --ignore-submodules=dirty  to status) become our
>> > friends.
>> I am not as much concerned about the 370 number than about the
>> 4 layers of nesting. In my experience the nested submodule case
>> is a little bit error prone and the bug reports are not as frequent as
>> there are not as many users of nesting, yet(?)
> well -- part of the story here is that we are forced to use/have full
> blown .git/ directories (for git-annex symlinks to content files to
> work) within submodules instead of .git file with a reference under
> parent's .git/modules.   So we can 'slice' at any level and I
> guess that is why may be avoiding some possibly issues due to nesting
> and the "parent has all .git/modules" approach.

That sounds like you either want to configure to have the submodules
git dirs in-place or you want to convince git-annex to learn about the
gitdir pointer files.

>> In a neighboring thread on the mailing list we have a discussion
>> on the usefulness of being on branches than in detached HEAD
>> in the submodules.
>> This would not break non-ambiguously, rather it would add
>> ease of use.
> that is indeed a common caveat... I am not sure if any heuristic
> approach would provide a 'bullet proof' solution.  I might even prefer a
> hardcoded 'branch-name' to be listed/associated with each submodule
> within .gitmodules.

hardcoded as submodule.NAME.branch, maybe?

>  In the datalad case, detached HEAD is common

So you are accustomed to detached HEADs and would not
gain much from being back on a branch?  That's cool, too.

> whenever someone installs "outdated" (branch of which progressed
> forward) submodule.  In this case we just check if the branch after "git
> clone"  (but before git submodule update) includes the pointed by
> Subproject commit, and if so -- we announce that it must be the branch
> (so far it is always "master" branch anyways ;) )

heh, having just one branch. That is retro-style. :)

      reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-19 15:59 Yaroslav Halchenko
2017-06-19 19:30 ` Stefan Beller
2017-06-19 20:20   ` Yaroslav Halchenko
2017-06-20  5:43     ` Stefan Beller [this message]

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