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From: Masaya Suzuki <>
Cc: Masaya Suzuki <>
Subject: [PATCH] doc: describe Git bundle format
Date: Thu, 30 Jan 2020 14:58:18 -0800
Message-ID: <> (raw)

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

Signed-off-by: Masaya Suzuki <>
 Documentation/technical/bundle-format.txt | 40 +++++++++++++++++++++++
 1 file changed, 40 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..dbb80225b5
--- /dev/null
+++ b/Documentation/technical/bundle-format.txt
@@ -0,0 +1,40 @@
+= 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 references pack
+signature = "# v2 git bundle" LF
+references   = *(prerequisite / ref) LF
+prerequisite = "-" obj-id SP comment LF
+comment      = *CHAR
+ref          = obj-id SP refname LF
+pack         = ... ; packfile
+== Semantics
+A Git bundle consists of three parts.
+*   Prerequisites: Optional list of objects that are not included in the bundle
+    file. A bundle can reference these prerequisite objects (or it can reference
+    the objects reachable from the prerequisite objects). The bundle itself
+    might not contain those objects.
+*   References: Mapping of ref names to objects.
+*   Git objects: Commit, tree, blob, and tags. These are included in the pack
+    format.
+If a bundle contains prerequisites, it means the bundle has a thin pack and the
+bundle alone is not enough for resolving all objects. When you read such
+bundles, you should have those missing objects beforehand.
+In the bundle format, there can be a comment following a prerequisite obj-id.
+This is a comment and it has no specific meaning. When you write a bundle, you
+can put any string here. When you read a bundle, you can ignore this part.

             reply	other threads:[~2020-01-30 22:58 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30 22:58 Masaya Suzuki [this message]
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 ` [PATCH v2] " Masaya Suzuki
2020-01-31 23:06   ` 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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