Arming ConditionNeedsUpdate

What is the post transaction-hook Arming ConditionNeedsUpdate...?

I see it after installing any package. Whether I install a specific package/app or after updating.

:: Running post-transaction hooks...
(1/4) Reloading system manager configuration...
(2/4) Arming ConditionNeedsUpdate...
(3/4) Checking which packages need to be rebuilt
(4/4) Updating the desktop file MIME type cache...
[wombat@endeavouros ~]$
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It is a systemd hook that ultimately does this:

touch -c /usr

I guess it just updates the timestamp on /usr if anything in /usr changes.


there’s a ton of jargon in a typical yay update output that’s I’d like to know about as well. good question.

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