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From: Junio C Hamano <gitster@pobox.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: git@vger.kernel.org, peartben@gmail.com,
	Christian Couder <christian.couder@gmail.com>,
	git@jeffhostetler.com
Subject: Re: RFC: Design and code of partial clones (now, missing commits and trees OK)
Date: Tue, 19 Sep 2017 14:51:52 +0900	[thread overview]
Message-ID: <xmqq8thbqlqf.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170915134343.3814dc38@twelve2.svl.corp.google.com> (Jonathan Tan's message of "Fri, 15 Sep 2017 13:43:43 -0700")

Jonathan Tan <jonathantanmy@google.com> writes:

> For those interested in partial clones and/or missing objects in repos,
> I've updated my original partialclone patches to not require an explicit
> list of promises. Fetch/clone still only permits exclusion of blobs, but
> the infrastructure is there for a local repo to support missing trees
> and commits as well.
> ...
> Demo
> ====
>
> Obtain a repository.
>
>     $ make prefix=$HOME/local install
>     $ cd $HOME/tmp
>     $ git clone https://github.com/git/git
>
> Make it advertise the new feature and allow requests for arbitrary blobs.
>
>     $ git -C git config uploadpack.advertiseblobmaxbytes 1
>     $ git -C git config uploadpack.allowanysha1inwant 1
>
> Perform the partial clone and check that it is indeed smaller. Specify
> "file://" in order to test the partial clone mechanism. (If not, Git will
> perform a local clone, which unselectively copies every object.)
>
>     $ git clone --blob-max-bytes=100000 "file://$(pwd)/git" git2
>     $ git clone "file://$(pwd)/git" git3
>     $ du -sh git2 git3
>     116M	git2
>     129M	git3
>
> Observe that the new repo is automatically configured to fetch missing objects
> from the original repo. Subsequent fetches will also be partial.
>
>     $ cat git2/.git/config
>     [core]
>     	repositoryformatversion = 1
>     	filemode = true
>     	bare = false
>     	logallrefupdates = true
>     [remote "origin"]
>     	url = [snip]
>     	fetch = +refs/heads/*:refs/remotes/origin/*
>     	blobmaxbytes = 100000
>     [extensions]
>     	partialclone = origin
>     [branch "master"]
>     	remote = origin
>     	merge = refs/heads/master

The above sequence of events make quite a lot of sense.  And the
following description of how it is designed (snipped) is clear
enough (at least to me) to allow me to say that I quite like it.



  reply	other threads:[~2017-09-19  5:51 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-15 20:43 RFC: Design and code of partial clones (now, missing commits and trees OK) Jonathan Tan
2017-09-19  5:51 ` Junio C Hamano [this message]
2017-09-21 17:57 ` Jeff Hostetler
2017-09-21 22:42   ` Jonathan Tan
2017-09-22 21:02     ` Jeff Hostetler
2017-09-22 22:49       ` Jonathan Tan
2017-09-26 15:26     ` Michael Haggerty
2017-09-29 20:21       ` Jonathan Tan
2017-09-21 17:59 ` RFC: Design and code of partial clones (now, missing commits and trees OK) (part 2/3) Jeff Hostetler
2017-09-21 22:51   ` Jonathan Tan
2017-09-22 21:19     ` Jeff Hostetler
2017-09-22 22:52       ` Jonathan Tan
2017-09-26 14:03         ` Jeff Hostetler
2017-09-21 18:00 ` RFC: Design and code of partial clones (now, missing commits and trees OK) (part 3) Jeff Hostetler
2017-09-21 23:04   ` Jonathan Tan
2017-09-22 21:32     ` Jeff Hostetler
2017-09-22 22:58       ` Jonathan Tan
2017-09-26 14:25         ` Jeff Hostetler
2017-09-26 17:32           ` Jonathan Tan
2017-09-29  0:53 ` RFC: Design and code of partial clones (now, missing commits and trees OK) Jonathan Tan
2017-09-29  2:03   ` Junio C Hamano

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