Re: [PATCH] advice: warn when sparse index expands

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

"Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:

> From: Derrick Stolee <stolee@gmail.com>
>
> Typically, forcing a sparse index to expand to a full index means that
> Git could not determine the status of a file outside of the
> sparse-checkout and needed to expand sparse trees into the full list of
> sparse blobs. This operation can be very slow when the sparse-checkout
> is much smaller than the full tree at HEAD.
>
> When users are in this state, it is common that 'git status' will report
> the problem. Usually there is a modified or untracked file outside of
> the sparse-checkout mentioned by the 'git status' output. There are a
> number of reasons why this is insufficient:

Nicely written to explain why giving an advice message is a good
idea to cover this situation.

Making it possible to squelch comes with no cost (once the code to
do so is written), so I do not have a huge problem with the use of
advise_if_enabled(), but I offhand do not know if the users would
ever want to squelch it.  Is this something that users would choose
to say "yes, I know what I am doing is making my sparse working tree
unusuably slow and I've heard how to whip my sparse working tree
into a better shape already---please do not tell it to me ever
again; because I need to leave these crufts outside the sparse cone
anyway, I am willing to accept the unusually slow response,
overhead, and wasted cycles and power" to?

Other than that, nicely done.