On Tue, May 28, 2013 at 10:04:46AM -0700, Junio C Hamano wrote:
> Matthijs Kooijman <matth...@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:
Given below suggestion, I take it you don't like what Jonathan proposed
(changing the meaning of the deepen parameter in the protocol so that
the server effectively decides how to interpret --depth)?
> - adding a capability on the sending side "fixed-off-by-one-depth"
> to the protocol, and teaching the sending side to advertise the
> - 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.
We can implement these two in current git already, since they only
add to the protocol, not break it in an incompatible manner, right?
> - 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).
And these should wait for git2, since they change the meaning of the
--depth parameter? Or is this change ok for current git as well?
What do you mean by "punt" exactly? Show an error to the user, saying
only depth >= 2 is supported?
> In the longer term, I think we should introduce a better deepening
> mechanism. Cf.
Even when there will be a better deepening mechanism, the above is still
useful (passing --depth=1 serves to get just a single commit without
history, which is a distinct usecase from deepening the history of an
existing shallow repository). In other words, I think the "improved
deepening" and "fixed depth" should be complementary features.
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