From: Duy Nguyen <pclouds@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Stefan Beller <sbeller@google.com>,
Git Mailing List <git@vger.kernel.org>
Subject: Re: [RFC/PATCH 0/3] protocol v2
Date: Tue, 3 Mar 2015 17:33:51 +0700 [thread overview]
Message-ID: <20150303103351.GA4922@lanh> (raw)
In-Reply-To: <20150302092136.GA30278@lanh>
On Mon, Mar 02, 2015 at 04:21:36PM +0700, Duy Nguyen wrote:
> On Sun, Mar 01, 2015 at 07:47:40PM -0800, Junio C Hamano wrote:
> > It seems, however, that our current thinking is that it is OK to do
> > the "allow new v1 clients to notice the availabilty of v2 servers,
> > so that they can talk v2 the next time" thing, so my preference is
> > to throw this "client first and let server notice" into "maybe
> > doable but not our first choice" bin, at least for now.
>
> OK let's see if first choice like this could work. Very draft but it
> should give some idea how to make a prototype to test it out. Note
> that the server still speaks first in this proposal.
Junio pointed out in private that I didn't address the packet length
limit (64k). I thought I could get away with a new capability
(i.e. not worry about it now) but I finally admit that was a bad
hack. So perhaps this on top.
The "WARN" line was originally supposed to be used when packet length
is still 64k and the server has a ref longer than that. It could then
skip that long ref and inform the user, so the user could re-request
again, this time asking for "long packet length" capability.
That's irrelevant now. But I think an option to say something without
abort may still be a good idea, especially if we allow hooks to
intercept the protocol.
-- 8< --
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt
index 32a1186..e2003c0 100644
--- a/Documentation/technical/pack-protocol.txt
+++ b/Documentation/technical/pack-protocol.txt
@@ -37,6 +37,20 @@ communicates with that invoked process over the SSH connection.
The file:// transport runs the 'upload-pack' or 'receive-pack'
process locally and communicates with it over a pipe.
+Pkt-line format
+---------------
+
+In version 1, a packet line consists of four bytes containing the
+length of the entire line plus four, in hexadecimal format. A flush
+consists of four zero bytes.
+
+In version 2, the four-byte header format remains supported but the
+maximum length is 0xfffe. If the length is 0xffff, the actual length
+follows in variable encoding in hexadecimal.
+
+XXX: perhaps go with 2-byte length by default instead because we don't
+usually need pkt-line longer than 256?? Maybe not worth saving a couple bytes
+
Git Transport
-------------
@@ -68,10 +82,12 @@ process on the server side over the Git protocol is this:
nc -v example.com 9418
If the server refuses the request for some reasons, it could abort
-gracefully with an error message.
+gracefully with an error message, or show a warning but and keep
+moving.
----
error-line = PKT-LINE("ERR" SP explanation-text)
+ warning-line = PKT-LINE("WARN" SP explanation-text)
----
SSH Transport
-- 8< --
next prev parent reply other threads:[~2015-03-03 10:33 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 3:12 [RFC/PATCH 0/3] protocol v2 Stefan Beller
2015-02-24 3:12 ` [PATCH 1/3] Document protocol capabilities extension Stefan Beller
2015-02-24 3:12 ` [PATCH 2/3] receive-pack: add advertisement of different protocol options Stefan Beller
2015-02-24 3:12 ` [PATCH 3/3] receive-pack: enable protocol v2 Stefan Beller
2015-02-24 4:02 ` [RFC/PATCH 0/3] " Duy Nguyen
2015-02-24 5:40 ` Stefan Beller
2015-02-24 6:15 ` Junio C Hamano
2015-02-24 23:37 ` Stefan Beller
2015-02-25 12:44 ` Duy Nguyen
2015-02-25 18:04 ` Junio C Hamano
2015-02-26 7:31 ` Stefan Beller
2015-02-26 10:15 ` Duy Nguyen
2015-02-26 20:08 ` Stefan Beller
[not found] ` <CACsJy8DOS_999ZgW7TqsH-dkrUFpjZf0TFQeFUt9s0bNhHY0Bw@mail.gmail.com>
2015-02-27 22:20 ` Stefan Beller
2015-02-26 20:13 ` Junio C Hamano
2015-02-27 1:26 ` Stefan Beller
2015-02-27 2:15 ` Stefan Beller
2015-02-27 23:05 ` Junio C Hamano
2015-02-27 23:44 ` Stefan Beller
2015-02-28 0:33 ` Junio C Hamano
2015-02-28 0:46 ` Stefan Beller
2015-02-28 1:01 ` [RFC/PATCH 0/5] protocol v2 for upload-pack Stefan Beller
2015-02-28 1:01 ` [RFC/PATCH 1/5] upload-pack: only accept capabilities on the first "want" line Stefan Beller
2015-02-28 1:01 ` [RFC/PATCH 2/5] upload-pack: support out of band client capability requests Stefan Beller
2015-02-28 7:47 ` Kyle J. McKay
2015-02-28 11:22 ` Duy Nguyen
2015-02-28 22:36 ` Kyle J. McKay
2015-03-01 0:11 ` Duy Nguyen
2015-02-28 11:36 ` Duy Nguyen
2015-02-28 1:01 ` [RFC/PATCH 3/5] connect.c: connect to a remote service with some flags Stefan Beller
2015-02-28 11:11 ` Torsten Bögershausen
2015-03-01 3:22 ` Junio C Hamano
2015-02-28 1:01 ` [RFC/PATCH 4/5] daemon.c: accept extra service arguments Stefan Beller
2015-03-01 3:39 ` Junio C Hamano
2015-02-28 1:01 ` [RFC/PATCH 5/5] WIP/Document the http protocol change Stefan Beller
2015-02-28 12:26 ` Duy Nguyen
2015-03-01 9:11 ` [RFC/PATCH 0/5] protocol v2 for upload-pack Johannes Sixt
2015-03-02 2:58 ` Junio C Hamano
2015-03-02 3:47 ` [RFC/PATCH 0/3] protocol v2 Junio C Hamano
2015-03-02 9:21 ` Duy Nguyen
2015-03-02 9:24 ` Duy Nguyen
2015-03-03 10:33 ` Duy Nguyen [this message]
2015-03-03 17:13 ` Junio C Hamano
2015-03-03 19:47 ` Junio C Hamano
2015-03-04 1:54 ` Duy Nguyen
2015-03-04 4:27 ` Shawn Pearce
2015-03-04 12:05 ` Duy Nguyen
2015-03-04 19:10 ` Shawn Pearce
2015-03-05 1:03 ` Stefan Beller
2015-03-05 16:03 ` Stefan Beller
2015-03-24 17:42 ` Stefan Beller
2015-03-24 18:00 ` Junio C Hamano
2015-03-06 23:38 ` [PATCH] protocol upload-pack-v2 Stefan Beller
2015-03-06 23:40 ` Stefan Beller
2015-03-06 23:55 ` Duy Nguyen
2015-03-07 0:00 ` Duy Nguyen
2015-03-07 0:28 ` Junio C Hamano
2015-03-07 4:28 ` Stefan Beller
2015-03-07 5:21 ` Duy Nguyen
2015-03-08 20:36 ` Junio C Hamano
2015-03-31 19:58 ` Junio C Hamano
2015-04-02 12:37 ` Duy Nguyen
2015-04-02 14:45 ` Junio C Hamano
2015-04-02 22:18 ` Martin Fick
2015-04-02 22:58 ` Junio C Hamano
2015-04-02 23:00 ` Stefan Beller
2015-04-02 23:14 ` Stefan Beller
2015-03-10 1:38 ` Duy Nguyen
2015-03-10 19:36 ` Kyle J. McKay
2015-02-28 0:07 ` [RFC/PATCH 0/3] protocol v2 Duy Nguyen
2015-02-28 0:26 ` Junio C Hamano
2015-03-01 8:41 ` Junio C Hamano
2015-03-01 11:32 ` Duy Nguyen
2015-03-01 19:56 ` Stefan Beller
2015-03-02 1:05 ` David Lang
2015-03-01 23:06 ` Junio C Hamano
2015-03-02 1:09 ` David Lang
2015-03-02 3:10 ` Junio C Hamano
2015-03-01 23:06 ` Philip Oakley
2015-03-02 9:32 ` Duy Nguyen
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