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nixos/docs: add non-switchable-systems section
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# Non Switchable Systems {#sec-non-switchable-system}
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In certain systems, most notably image based appliances, updates are handled
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outside the system. This means that you do not need to rebuild your
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configuration on the system itself anymore.
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If you want to build such a system, you can use the `image-based-appliance`
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profile:
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```nix
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{ modulesPath, ... }: {
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imports = [ "${modulesPath}/profiles/image-based-appliance.nix" ]
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}
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```
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The most notable deviation of this profile from a standard NixOS configuration
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is that after building it, you cannot switch *to* the configuration anymore.
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The profile sets `config.system.switch.enable = false;`, which excludes
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`switch-to-configuration`, the central script called by `nixos-rebuild`, from
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your system. Removing this script makes the image lighter and slightly more
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secure.
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@ -51,4 +51,5 @@ explained in the next sections.
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```{=include=} sections
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```{=include=} sections
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unit-handling.section.md
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unit-handling.section.md
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activation-script.section.md
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activation-script.section.md
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non-switchable-systems.section.md
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```
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```
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