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>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2013-02-23 09:29:31 +07:00 committed by Junio C Hamano
parent b82a7b5bbc
commit 647d87947f

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