[BRLTTY] Are changes needed for systemd 247.1?

[Dave Mielke]

[quoted lines by Alexander Epaneshnikov on 2020/12/09 at 01:30 +0300]

>that was recommendation from upstream systemd.
>snip from systemd news:
>>            • All rule files that currently use a header guard similar to
>>              ACTION!="add|change",GOTO="xyz_end" should be updated to use
>>              ACTION=="remove",GOTO="xyz_end" instead, so that the
>>              properties/tags they add are also applied whenever "bind" (or
>>              "unbind") is seen. (This is most important for all physical device
>>              types — those for which "bind" and "unbind" are currently
>>              generated, for all other device types this change is still
>>              recommended but not as important — but certainly prepares for
>>              future kernel uevent type additions).
>> 
>>            • Similarly, all code monitoring devices that contains an 'if' branch
>>              discerning the "add" + "change" uevent actions from all other
>>              uevents actions (i.e. considering devices only relevant after "add"
>>              or "change", and irrelevant on all other events) should be reworked
>>              to instead negatively check for "remove" only (i.e. considering
>>              devices relevant after all event types, except for "remove", which
>>              invalidates the device). Note that this also means that devices
>>              should be considered relevant on "unbind", even though conceptually
>>              this — in some form — invalidates the device. Since the precise
>>              effect of "unbind" is not generically defined, devices should be
>>              considered relevant even after "unbind", however I/O errors
>>              accessing the device should then be handled gracefully.

Thanks. Now I can see what they want - all possible actins to be tagged with
systemd. Please test the latest code. It now just tests for add and then goes
to default.

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