On Mon, Dec 8, 2014 at 9:04 AM, Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> wrote:
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
> ---
> diff --git a/Documentation/technical/index-format.txt b/Documentation/technical/index-format.txt
> index fe6f316..b97ac8d 100644
> --- a/Documentation/technical/index-format.txt
> +++ b/Documentation/technical/index-format.txt
> @@ -233,3 +233,61 @@ Git index format
> The remaining index entries after replaced ones will be added to the
> final index. These added entries are also sorted by entry namme then
> stage.
> +
> +== Untracked cache
> +
> + Untracked cache saves the untracked file list and necessary data to
> + verify the cache. The signature for this extension is { 'U', 'N',
> + 'T', 'R' }.
> +
> + The extension starts with
> +
> + - Stat data of $GIT_DIR/info/exclude. See "Index entry" section from
> + ctime field until "file size".
> +
> + - Stat data of core.excludesfile
> +
> + - 32-bit dir_flags (see struct dir_struct)
> +
> + - 160-bit SHA-1 of $GIT_DIR/info/exclude. Null SHA-1 means the file
> + does not exist.
> +
> + - 160-bit SHA-1 of core.excludesfile. Null SHA-1 means the file does
> + not exist.
> +
> + - NUL-terminated string of per-dir exclude file name. This usually
> + is ".gitignore".
> +
> + - The number of following directory blocks, variable width
> + encoding. If this number is zero, the extension ends here with a
> + following NUL.
> +
> + - A number of directory blocks in depth-first-search order, each
> + consists of
> +
> + - The number of untracked entries, variable witdh encoding.
s/witdh/width/
> + - The number of sub-directory blocks, variable with encoding.
s/with/width/
> + - The directory name terminated by NUL.
> +
> + - A number of untrached file/dir names terminated by NUL.
> +
> +The remaining data of each directory block is grouped by type:
> +
> + - An ewah bitmap, the n-th bit marks whether the n-th directory has
> + valid untracked cache entries.
> +
> + - An ewah bitmap, the n-th bit records "check-only" bit of
> + read_directory_recursive() for the n-th directory.
> +
> + - An ewah bitmap, the n-th bit indicates whether SHA-1 and stat data
> + is valid for the n-th directory and exists in the next data.
> +
> + - An array of stat data. The n-th data corresponds with the n-th
> + "one" bit in the previous ewah bitmap.
> +
> + - An array of SHA-1. The n-th SHA-1 corresponds with the n-th "one" bit
> + in the previous ewah bitmap.
> +
> + - One NUL.
--
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