2cbda74862
The systemctl completion previously made use of PREFIX as a pattern argument to list-unit-files and list-units. This had the problem of erroneously filtering the results that were stored in the cache, and erroneously filtering results that might have been requested according to the users configuration (e.g. _correct completer, certain matcher-lists or tag-orders, etc.). Unfortunately, the runtime of list-unit-files increases when no pattern argument is provided, and systemctl show, used to filter those units, can become unacceptably slow when provided with too many units to describe. Let's re-introduce the pattern argument to list-unit-files and list-units where necessary in order to alleviate these bottlenecks without poisining the cache. A 'use-pattern' style is introduced that may be used to disable this behavior if it is undesired. We can still expect that certain completions, like `systemctl start <TAB>` will be slow, like before. To fix this we will need systemd to learn a more efficient way of filtering the units than parsing systemctl show.
System and Service Manager
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