switch-to-configuration: Add new option X-OnlyManualStart #82139
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This is to facilitate units that should only be manually started and not activated when a configuration is switched to.
More specifically this is to be used by the new Nixops deploy-* targets created in NixOS/nixops#1245 that are triggered by Nixops before/after switch-to-configuration is called.
Thank you to Yakkertech for sponsoring this work.
Motivation for this change
Things done
sandbox
innix.conf
on non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
./result/bin/
)nix path-info -S
before and after)