-* teach systemctl to enable unit files in arbitrary directories
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-* In systemctl make sure both is-enabled and is-active print a string, or neither.
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-* Implement:
- systemctl mask <unit>
- systemctl unmask <unit>
- Also support --temp to make this temporary by placing mask links in /run.
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-* perhaps add "systemctl reenable" as combination of "systemctl disable" and "systemctl enable"
-