David Turner <dtur...@twopensource.com> writes:

> On Wed, 2014-05-07 at 08:17 +0200, Johannes Sixt wrote:
>> >            } else if (cache_name_pos(src, length) < 0)
>> >                    bad = _("not under version control");
>> > -          else if (lstat(dst, &st) == 0) {
>> > +          else if (lstat(dst, &dst_st) == 0 &&
>> > +                   (src_st.st_ino != dst_st.st_ino ||
>> > +                    (src_st.st_ino == 0 && strcasecmp(src, dst)))) {
>> 
>> Don't do that. st_ino is zero on Windows only because we do not spend time
>> to fill in the field. Don't use it as an indicator for a case-insensitive
>> file system; zero may be a valid inode number on other systems.
>
> I don't think it is a problem if zero is a valid inode.  The only thing
> that happens when there is a zero inode, is that we have to compare
> filenames.  The inode check is just an optimization to avoid doing a
> bunch of strcasecmp on systems that don't have to.

Am I correct to rephrase you that the code assumes that any
filesystem that cannot give unique inum to different files will use
0 as the placeholder inum, so if src/dst share the same non-zero
inum, it is guaranteed that is not a placeholder and we know they
are different files without comparing the two paths?

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