Re: [PATCH] path_treatment: also ignore $GIT_DIR if it's not .git

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On Mon, Dec 2, 2013 at 6:38 AM, Dennis Kaarsemaker
<dennis@xxxxxxxxxxxxxxx> wrote:
> On ma, 2013-12-02 at 00:08 +0100, Thomas Rast wrote:
>> Duy Nguyen <pclouds@xxxxxxxxx> writes:
>>
>> > On Mon, Dec 2, 2013 at 2:04 AM, Dennis Kaarsemaker
>> > <dennis@xxxxxxxxxxxxxxx> wrote:
>> >> We always ignore anything named .git, but we should also ignore the git
>> >> directory if the user overrides it by setting $GIT_DIR
>> [...]
>> >> +       if (simplify_away(path->buf, path->len, simplify) || is_git_directory(path->buf))
>> >>                 return path_none;
>> >
>> > this adds 2 access, 1 lstat, 1 open, 1 read, 1 close to _every_ path
>> > we check. Is it worth the cost?
>>
>> Moreover it is a much more inclusive check than what the commit message
>> claims: it will ignore anything that looks like a .git directory,
>> regardless of the name.  In particular GIT_DIR doesn't have anything to
>> do with it.
>
> Ah, yes thanks, that's rather incorrect indeed. How about the following
> instead? Passes all tests, including the new one.
>
> --- a/dir.c
> +++ b/dir.c
> @@ -1198,7 +1198,7 @@ static enum path_treatment treat_path(struct dir_struct *dir,
>                 return path_none;
>         strbuf_setlen(path, baselen);
>         strbuf_addstr(path, de->d_name);
> -       if (simplify_away(path->buf, path->len, simplify))
> +       if (simplify_away(path->buf, path->len, simplify) || !strncmp(get_git_dir(), path->buf, path->len))
>                 return path_none;

get_git_dir() may return a relative or absolute path, depending on
GIT_DIR/GIT_WORK_TREE. path->buf is always relative. You'll pass one
case with this (relative vs relative) and fail another. It might be
simpler to just add get_git_dir(), after converting to relative path
and check if it's in worktree, to the exclude list and let the current
exclude mechanism handle it.
-- 
Duy
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