Re: [PATCH 16/16] ls-files: add --overlay option

[Junio C Hamano <gitster@pobox.com>]

Nguyễn Thái Ngọc Duy  <pclouds@gmail.com> writes:

> The same situation happens for "assume unchanged" bit, but I would
> expect narrow checkout to be more user-friendly and should notify users
> these cases so users will not be confused. On this first step, users
> may check by themselves with "git ls-files --overlay",...

Could you explain how the earlier --narrow-checkout option introduced in
[05/16] interacts with this one?

The user has X inside narrow area and Y outside.  ls-files reports both X
and Y.  'ls-files --narrow-checkout' reports only X.  Y is tracked but not
really, so 'ls-files --narrow-checkout -o' shouldn't say Y is untracked;
there is no cue to tell between X and Y.

But with a half of your patch to 'ls-files -t', you already can show these
potentially stale (leftover from an ancient checkout un-updated because of
narrowness) files.  Could a simpler alternative be to do this processing
not inside "if (show_deleted/modified)" part of show_files(), but inside
"if (show_cached/stage)" part of it?  Instead of saying tag_cached
unconditionally, if the entry is marked no_checkout, then you would
lstat(2) it there and report that the path is "marked not to be checked
out but somehow something exists there".

By the way, I do not see an easy way to review what paths are marked with
no-checkout easily from your command set.  It might be worthwhile to add a
new option that iterates over the index, finds a set of common prefixes to
no-checkout entries and reports that set.