doc: Add documentation for the new option to the Automatic Upgrades section
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@ -120,12 +120,17 @@ nixos https://nixos.org/channels/nixos-unstable
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to <filename>configuration.nix</filename>:
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<programlisting>
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<xref linkend="opt-system.autoUpgrade.enable"/> = true;
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<xref linkend="opt-system.autoUpgrade.allowReboot"/> = true;
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</programlisting>
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This enables a periodically executed systemd service named
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<literal>nixos-upgrade.service</literal>. It runs <command>nixos-rebuild
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switch --upgrade</command> to upgrade NixOS to the latest version in the
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current channel. (To see when the service runs, see <command>systemctl
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list-timers</command>.) You can also specify a channel explicitly, e.g.
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<literal>nixos-upgrade.service</literal>. If the <literal>allowReboot</literal>
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option is <literal>false</literal>, it runs <command>nixos-rebuild switch
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--upgrade</command> to upgrade NixOS to the latest version in the current
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channel. (To see when the service runs, see <command>systemctl list-timers</command>.)
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If <literal>allowReboot</literal> is <literal>true</literal>, then the
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system will automatically reboot if the new generation contains a different
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kernel, initrd or kernel modules.
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You can also specify a channel explicitly, e.g.
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<programlisting>
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<xref linkend="opt-system.autoUpgrade.channel"/> = https://nixos.org/channels/nixos-19.09;
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</programlisting>
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