RFC: Sparse checkout improvements (was: Re: question (possibly) on git subtree/submodules)

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On 10-07-27 08:48 AM, Jakub Narebski wrote:
> Alex <ajb44.geo@xxxxxxxxx> writes:
> 
>> Chris Packham <judge.packham <at> gmail.com> writes:
>>
>>> The short answer is no. Nothing git has currently will let you clone a
>>> subset of files. 
>>
>> Isn't that what 'sparse checkout' does?
>> (http://www.kernel.org/pub/software/scm/git/docs/git-read-tree.html#_sparse_checkout)
> 
> No, 'sparse checkout' is only about checkout, i.e. the working area.
> You still have all objects in repository, only part of tree (part of
> project / repository) is not checked out, not present on disk as
> files.

There's no such thing as a "sparse fetch" but you can do something like

	git clone -n git://there/foo.git
	cd foo

then

	git checkout origin/<branch> -- <paths...>

or
	git config core.sparseCheckout true
	[ Add paths to .git/info/sparse-checkout ]
	git checkout <branch>


but it's fairly inconvenient for day-to-day work.  Also, putting a
.git/info/sparse-checkout file in a public repo seems of limited use.

So IMHO the current sparse-checkout feature is pretty bare-bones and could
use some meat.  Here's some thoughts:

* What's missing is a way to define named collections of paths
("sparse-sets?") in .git/info/sparse-checkout, so that you can conveniently
checkout a particular subset of the working directory.  It would also be nice
to switch between different sparse-sets.

* It would also be good to have a way for a repo to define a default
sparse-set, so that a clone would only checkout that default.

* I also think that core.sparseCheckout should be true by default, and git
should impose no sparseness if .git/info/sparse-checkout is missing or empty.

Comments?

		M.
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