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From: Masaya Suzuki <masayasuzuki@google.com>
To: git@vger.kernel.org
Cc: Masaya Suzuki <masayasuzuki@google.com>
Subject: [PATCH v2] doc: describe Git bundle format
Date: Fri, 31 Jan 2020 14:18:00 -0800
Message-ID: <20200131221800.240352-1-masayasuzuki@google.com> (raw)
In-Reply-To: <20200130225818.193825-1-masayasuzuki@google.com>

The bundle format was not documented. Describe the format with ABNF and
explain the meaning of each part.

Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
---
Changes from v1:

* Update the ABNF definition so that prerequisites come before references.
* Adopt Junio's suggestion on the semantics section.
* State that the receiver MUST ignore the comments in the prereqs.
* Change "you" to "the receiver" and "the sender" (I wonder if this should be
  "writer" and "reader").

 Documentation/technical/bundle-format.txt | 41 +++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/technical/bundle-format.txt

diff --git a/Documentation/technical/bundle-format.txt b/Documentation/technical/bundle-format.txt
new file mode 100644
index 0000000000..f568fcd7d1
--- /dev/null
+++ b/Documentation/technical/bundle-format.txt
@@ -0,0 +1,41 @@
+= Git bundle v2 format
+
+The Git bundle format is a format that represents both refs and Git objects.
+
+== Format
+
+We will use ABNF notation to define the Git bundle format. See
+protocol-common.txt for the details.
+
+----
+bundle    = signature *prerequisite *reference LF pack
+signature = "# v2 git bundle" LF
+
+prerequisite = "-" obj-id SP comment LF
+comment      = *CHAR
+reference    = obj-id SP refname LF
+
+pack         = ... ; packfile
+----
+
+== Semantics
+
+A Git bundle consists of three parts.
+
+* "Prerequisites" lists the objects that are NOT included in the bundle and the
+  receiver of the bundle MUST already have, in order to use the data in the
+  bundle. The objects stored in the bundle may refer to prerequisite objects and
+  anything reachable from them and/or expressed as a delta against prerequisite
+  objects.
+
+* "References" record the tips of the history graph, iow, what the receiver of
+  the bundle CAN "git fetch" from it.
+
+* "Pack" is the pack data stream "git fetch" would send, if you fetch from a
+  repository that has the references recorded in the "References" above into a
+  repository that has references pointing at the objects listed in
+  "Prerequisites" above.
+
+In the bundle format, there can be a comment following a prerequisite obj-id.
+This is a comment and it has no specific meaning. The sender of the bundle MAY
+put any string here. The receiver of the bundle MUST ignore the comment.
-- 
2.25.0.341.g760bfbb309-goog


  parent reply	other threads:[~2020-01-31 22:18 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30 22:58 [PATCH] " Masaya Suzuki
2020-01-31 13:56 ` Johannes Schindelin
2020-01-31 20:38 ` Junio C Hamano
2020-01-31 21:49   ` Masaya Suzuki
2020-01-31 23:01     ` Junio C Hamano
2020-01-31 23:57       ` Masaya Suzuki
2020-02-04 18:20         ` Junio C Hamano
2020-01-31 22:18 ` Masaya Suzuki [this message]
2020-01-31 23:06   ` [PATCH v2] " Junio C Hamano
2020-02-07 20:42   ` [PATCH v3] " Masaya Suzuki
2020-02-07 20:44     ` Masaya Suzuki
2020-02-07 20:59       ` Junio C Hamano
2020-02-07 22:21         ` Masaya Suzuki
2020-02-08  1:49           ` Junio C Hamano
2020-02-12 22:13             ` Masaya Suzuki
2020-02-12 22:43               ` Junio C Hamano

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