Mercurial supports generating standalone "bundle" files that hold repository

data. These "bundles" are typically saved locally and used later or exchanged

between different repositories, possibly on different machines. Example

commands using bundles are :hg:`bundle` and :hg:`unbundle`.

Generation of bundle files is controlled by a "bundle specification"

("bundlespec") string. This string tells the bundle generation process how

to create the bundle.

A "bundlespec" string is composed of the following elements:

type

    A string denoting the bundle format to use.

compression

    Denotes the compression engine to use compressing the raw bundle data.

parameters

    Arbitrary key-value parameters to further control bundle generation.

A "bundlespec" string has the following formats:

<type>

    The literal bundle format string is used.

<compression>-<type>

    The compression engine and format are delimited by a hyphen (``-``).

Optional parameters follow the ``<type>``. Parameters are URI escaped

``key=value`` pairs. Each pair is delimited by a semicolon (``;``). The

first parameter begins after a ``;`` immediately following the ``<type>``

value.

Available Types

===============

The following bundle <type> strings are available:

v1

    Produces a legacy "changegroup" version 1 bundle.

    This format is compatible with nearly all Mercurial clients because it is

    the oldest. However, it has some limitations, which is why it is no longer

    the default for new repositories.

    ``v1`` bundles can be used with modern repositories using the "generaldelta"

    storage format. However, it may take longer to produce the bundle and the

    resulting bundle may be significantly larger than a ``v2`` bundle.

    ``v1`` bundles can only use the ``gzip``, ``bzip2``, and ``none`` compression

    formats.

v2

    Produces a version 2 bundle.

    Version 2 bundles are an extensible format that can store additional

    repository data (such as bookmarks and phases information) and they can

    store data more efficiently, resulting in smaller bundles.

    Version 2 bundles can also use modern compression engines, such as

    ``zstd``, making them faster to compress and often smaller.

Available Compression Engines

=============================

The following bundle <compression> engines can be used:

.. bundlecompressionmarker

Examples

========

``v2``

    Produce a ``v2`` bundle using default options, including compression.

``none-v1``

    Produce a ``v1`` bundle with no compression.

``zstd-v2``

    Produce a ``v2`` bundle with zstandard compression using default

    settings.

``zstd-v1``

    This errors because ``zstd`` is not supported for ``v1`` types.