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Mercurial supports generating standalone "bundle" files that hold repository
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data. These "bundles" are typically saved locally and used later or exchanged
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between different repositories, possibly on different machines. Example
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commands using bundles are :hg:`bundle` and :hg:`unbundle`.
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Generation of bundle files is controlled by a "bundle specification"
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("bundlespec") string. This string tells the bundle generation process how
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to create the bundle.
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A "bundlespec" string is composed of the following elements:
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type
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A string denoting the bundle format to use.
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compression
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Denotes the compression engine to use compressing the raw bundle data.
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parameters
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Arbitrary key-value parameters to further control bundle generation.
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A "bundlespec" string has the following formats:
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<type>
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The literal bundle format string is used.
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<compression>-<type>
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The compression engine and format are delimited by a hyphen (``-``).
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Optional parameters follow the ``<type>``. Parameters are URI escaped
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``key=value`` pairs. Each pair is delimited by a semicolon (``;``). The
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first parameter begins after a ``;`` immediately following the ``<type>``
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value.
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Available Types
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===============
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The following bundle <type> strings are available:
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v1
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Produces a legacy "changegroup" version 1 bundle.
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This format is compatible with nearly all Mercurial clients because it is
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the oldest. However, it has some limitations, which is why it is no longer
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the default for new repositories.
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``v1`` bundles can be used with modern repositories using the "generaldelta"
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storage format. However, it may take longer to produce the bundle and the
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resulting bundle may be significantly larger than a ``v2`` bundle.
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``v1`` bundles can only use the ``gzip``, ``bzip2``, and ``none`` compression
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formats.
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v2
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Produces a version 2 bundle.
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Version 2 bundles are an extensible format that can store additional
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repository data (such as bookmarks and phases information) and they can
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store data more efficiently, resulting in smaller bundles.
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Version 2 bundles can also use modern compression engines, such as
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``zstd``, making them faster to compress and often smaller.
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Available Compression Engines
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=============================
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The following bundle <compression> engines can be used:
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.. bundlecompressionmarker
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Examples
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========
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``v2``
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Produce a ``v2`` bundle using default options, including compression.
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``none-v1``
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Produce a ``v2`` bundle with no compression.
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``zstd-v2``
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Produce a ``v2`` bundle with zstandard compression using default
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settings.
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``zstd-v1``
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This errors because ``zstd`` is not supported for ``v1`` types.
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