On 01/06/2018 05:05 AM, Ulrich Mueller wrote:
>>>>>> On Sat, 6 Jan 2018, Duncan  wrote:
>> $ equery b news.eselect
>> app-admin/eselect-1.4.10 (/usr/share/eselect/modules/news.eselect)
>> So in that case it's not the PM, but eselect.
> In fact, it is the PM that would do the filtering, before filling the
> list of unread news items in /var/lib/gentoo/news/news-gentoo.read.
> Filtering in eselect news would be problematic: Obtaining the list
> of items with "eselect news list" and e.g. reading them with "eselect
> news read" are issued as separate commands, which requires that the
> list of valid items does not change. However, time-based filtering
> could cause a race condition, like an item expiring between execution
> of the two commands.
> Ulrich

The race condition could be addressed by issuing a warning
at or around the time when expirations occur (midnight),
with or without detecting specific expirations which may
have occurred:

WARNING: [n] is about to / has expired, and the list order
is about to / has just changed (as appropriate for list
and read respectively)

Otherwise just warn when the commands run near midnight.

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