From: Junio C Hamano <gitster@pobox.com>
To: Matthijs Kooijman <matthijs@stdin.nl>
Cc: Duy Nguyen <pclouds@gmail.com>,
Jonathan Nieder <jrnieder@gmail.com>,
Stefan Beller <stefanbeller@googlemail.com>,
schlotter@users.sourceforge.net, Ralf.Wildenhues@gmx.de,
git@vger.kernel.org
Subject: Re: [PATCH] git clone depth of 0 not possible.
Date: Tue, 28 May 2013 10:04:46 -0700 [thread overview]
Message-ID: <7va9nf2fyp.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: 20130528091812.GG25742@login.drsnuggles.stderr.nl
Matthijs Kooijman <matthijs@stdin.nl> writes:
> Did you consider how to implement this? Looking at the code, it seems
> the "deepen" parameter in the wire protocol now means:
> - 0: Do not change anything about the shallowness (i.e., fetch
> everything from the shallow root to the tip).
> - > 0: Create new shallow commits at depth commits below the tip (so
> depth == 1 means tip and one below).
> - INFINITE_DEPTH (0x7fffffff): Remove all shallowness and fetch
> complete history.
>
> Given this, I'm not sure how one can express "fetch the tip and nothing
> below that", since depth == 0 already has a different meaning.
Doing it "correctly" (in the shorter term) would involve:
- adding a capability on the sending side "fixed-off-by-one-depth"
to the protocol, and teaching the sending side to advertise the
capability;
- teaching the requestor that got --depth=N from the end user to
pay attention to the new capability in such a way that:
- when talking to an old sender (i.e. without the off-by-one
fix), send N-1 for N greater than 1. Punt on N==1;
- when talking to a fixed sender, ask to enable the capability,
and send N as is (including N==1).
- teaching the sending side to see if the new behaviour to fix
off-by-one is asked by the requestor, and stop at the correct
number of commits, not oversending one more. Otherwise retain
the old behaviour.
In the longer term, I think we should introduce a better deepening
mechanism. Cf.
http://thread.gmane.org/gmane.comp.version-control.git/212912/focus=212940
> Of course, one could using depth == 1 in this case to receive two
> commits and then drop one, but this would seem a bit pointless to me
> (especially if the commit below the tip is very different from the tip
> leading to a lot of useless data transfer).
next prev parent reply other threads:[~2013-05-28 17:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-07 18:06 [PATCH] git clone depth of 0 not possible Stefan Beller
2013-01-07 18:06 ` [PATCH] Documentation on depth option in git clone Stefan Beller
2013-01-08 6:28 ` [PATCH] git clone depth of 0 not possible Jonathan Nieder
2013-01-08 6:54 ` Junio C Hamano
2013-01-08 7:36 ` Junio C Hamano
2013-01-08 8:19 ` Junio C Hamano
2013-01-08 14:28 ` Duy Nguyen
2013-01-08 14:32 ` Stefan Beller
2013-01-08 14:45 ` Duy Nguyen
2013-01-08 17:24 ` Junio C Hamano
2013-01-08 7:38 ` Duy Nguyen
2013-01-08 8:05 ` Junio C Hamano
2013-05-28 9:18 ` Matthijs Kooijman
2013-05-28 16:28 ` Jonathan Nieder
2013-05-28 16:31 ` Jonathan Nieder
2013-05-28 16:34 ` Matthijs Kooijman
2013-05-28 16:58 ` Jonathan Nieder
2013-05-28 17:04 ` Junio C Hamano [this message]
2013-05-30 8:23 ` Matthijs Kooijman
2013-06-02 19:14 ` Junio C Hamano
2013-07-09 13:35 ` Matthijs Kooijman
2013-07-11 10:57 ` Matthijs Kooijman
2013-07-11 11:25 ` [PATCH 1/3] upload-pack: Remove a piece of dead code Matthijs Kooijman
2013-07-11 11:25 ` [PATCH 2/3] upload-pack: Introduce new "fixed-off-by-one-depth" server feature Matthijs Kooijman
2013-07-11 11:25 ` [PATCH 3/3] fetch-pack: Request fixed-off-by-one-depth when available Matthijs Kooijman
2013-07-11 12:08 ` [PATCH 1/3] upload-pack: Remove a piece of dead code Duy Nguyen
2013-07-11 15:49 ` Junio C Hamano
2013-01-08 7:33 ` [PATCH] git clone depth of 0 not possible Duy Nguyen
2013-01-08 7:37 ` Junio C Hamano
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