update-index: list supported idx versions and their features
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -145,7 +145,15 @@ you will need to handle the situation manually.
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--index-version <n>::
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Write the resulting index out in the named on-disk format version.
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The current default version is 2.
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Supported versions are 2, 3 and 4. The current default version is 2
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or 3, depending on whether extra features are used, such as
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`git add -N`.
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+
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Version 4 performs a simple pathname compression that reduces index
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size by 30%-50% on large repositories, which results in faster load
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time. Version 4 is relatively young (first released in in 1.8.0 in
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October 2012). Other Git implementations such as JGit and libgit2
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may not support it yet.
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-z::
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Only meaningful with `--stdin` or `--index-info`; paths are
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