611e9302f9
When a NixOS system uses flakes, i.e., /etc/nixos/flake.nix exists, it
is impossible to use nixos-rebuild to build a pre-flake
configuration.nix. Of course, one can directly use nix command to
build the configuration, but not everybody remembers the correct nix
options to do that.
With the new option, it is possible to build a pre-flake configuration
with command like this:
nixos-rebuild build-vm -I nixos-config=./vm.nix --no-flake
The option might be useful for people following older pre-flake
tutorials on a flake-based system.
708 lines
20 KiB
XML
708 lines
20 KiB
XML
<refentry xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refmeta>
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<refentrytitle><command>nixos-rebuild</command>
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</refentrytitle><manvolnum>8</manvolnum>
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<refmiscinfo class="source">NixOS</refmiscinfo>
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<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
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</refmeta>
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<refnamediv>
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<refname><command>nixos-rebuild</command></refname>
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<refpurpose>reconfigure a NixOS machine</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-rebuild</command><group choice='req'>
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<arg choice='plain'>
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<option>switch</option>
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</arg>
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<arg choice='plain'>
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<option>boot</option>
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</arg>
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<arg choice='plain'>
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<option>test</option>
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</arg>
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<arg choice='plain'>
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<option>build</option>
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</arg>
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<arg choice='plain'>
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<option>dry-build</option>
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</arg>
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<arg choice='plain'>
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<option>dry-activate</option>
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</arg>
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<arg choice='plain'>
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<option>edit</option>
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</arg>
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<arg choice='plain'>
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<option>build-vm</option>
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</arg>
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<arg choice='plain'>
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<option>build-vm-with-bootloader</option>
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</arg>
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</group>
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<sbr />
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<arg>
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<group choice='req'>
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<arg choice='plain'>
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<option>--upgrade</option>
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</arg>
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<arg choice='plain'>
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<option>--upgrade-all</option>
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</arg>
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</group>
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</arg>
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<arg>
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<option>--install-bootloader</option>
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</arg>
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<arg>
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<option>--no-build-nix</option>
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</arg>
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<arg>
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<option>--fast</option>
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</arg>
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<arg>
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<option>--rollback</option>
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</arg>
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<arg>
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<option>--builders</option> <replaceable>builder-spec</replaceable>
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</arg>
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<sbr/>
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<arg>
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<option>--flake</option> <replaceable>flake-uri</replaceable>
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</arg>
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<arg>
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<option>--no-flake</option>
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</arg>
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<arg>
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<option>--override-input</option> <replaceable>input-name</replaceable> <replaceable>flake-uri</replaceable>
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</arg>
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<sbr />
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<arg>
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<group choice='req'>
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<arg choice='plain'>
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<option>--profile-name</option>
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</arg>
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<arg choice='plain'>
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<option>-p</option>
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</arg>
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</group> <replaceable>name</replaceable>
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</arg>
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<sbr />
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<arg>
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<option>--build-host</option> <replaceable>host</replaceable>
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</arg>
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<arg>
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<option>--target-host</option> <replaceable>host</replaceable>
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</arg>
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<arg>
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<option>--use-remote-sudo</option>
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</arg>
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<sbr />
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<arg>
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<option>--show-trace</option>
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</arg>
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<arg>
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<option>-I</option>
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<replaceable>path</replaceable>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--verbose</option></arg>
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<arg choice='plain'><option>-v</option></arg>
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</group>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--impure</option></arg>
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</group>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--max-jobs</option></arg>
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<arg choice='plain'><option>-j</option></arg>
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</group>
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<replaceable>number</replaceable>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--keep-failed</option></arg>
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<arg choice='plain'><option>-K</option></arg>
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</group>
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</arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--keep-going</option></arg>
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<arg choice='plain'><option>-k</option></arg>
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</group>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection>
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<title>Description</title>
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<para>
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This command updates the system so that it corresponds to the
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configuration specified in
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<filename>/etc/nixos/configuration.nix</filename> or
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<filename>/etc/nixos/flake.nix</filename>. Thus, every time you
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modify the configuration or any other NixOS module, you must run
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<command>nixos-rebuild</command> to make the changes take
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effect. It builds the new system in
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<filename>/nix/store</filename>, runs its activation script, and
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stop and (re)starts any system services if needed. Please note that
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user services need to be started manually as they aren't detected
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by the activation script at the moment.
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</para>
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<para>
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This command has one required argument, which specifies the desired
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operation. It must be one of the following:
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<variablelist>
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<varlistentry>
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<term>
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<option>switch</option>
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</term>
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<listitem>
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<para>
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Build and activate the new configuration, and make it the boot default.
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That is, the configuration is added to the GRUB boot menu as the default
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menu entry, so that subsequent reboots will boot the system into the new
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configuration. Previous configurations activated with
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<command>nixos-rebuild switch</command> or <command>nixos-rebuild
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boot</command> remain available in the GRUB menu.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>boot</option>
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</term>
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<listitem>
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<para>
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Build the new configuration and make it the boot default (as with
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<command>nixos-rebuild switch</command>), but do not activate it. That
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is, the system continues to run the previous configuration until the
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next reboot.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>test</option>
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</term>
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<listitem>
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<para>
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Build and activate the new configuration, but do not add it to the GRUB
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boot menu. Thus, if you reboot the system (or if it crashes), you will
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automatically revert to the default configuration (i.e. the
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configuration resulting from the last call to <command>nixos-rebuild
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switch</command> or <command>nixos-rebuild boot</command>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>build</option>
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</term>
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<listitem>
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<para>
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Build the new configuration, but neither activate it nor add it to the
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GRUB boot menu. It leaves a symlink named <filename>result</filename> in
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the current directory, which points to the output of the top-level
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“system” derivation. This is essentially the same as doing
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<screen>
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<prompt>$ </prompt>nix-build /path/to/nixpkgs/nixos -A system
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</screen>
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Note that you do not need to be <literal>root</literal> to run
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<command>nixos-rebuild build</command>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>dry-build</option>
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</term>
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<listitem>
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<para>
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Show what store paths would be built or downloaded by any of the
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operations above, but otherwise do nothing.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>dry-activate</option>
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</term>
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<listitem>
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<para>
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Build the new configuration, but instead of activating it, show what
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changes would be performed by the activation (i.e. by
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<command>nixos-rebuild test</command>). For instance, this command will
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print which systemd units would be restarted. The list of changes is not
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guaranteed to be complete.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>edit</option>
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</term>
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<listitem>
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<para>
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Opens <filename>configuration.nix</filename> in the default editor.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>build-vm</option>
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</term>
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<listitem>
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<para>
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Build a script that starts a NixOS virtual machine with the desired
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configuration. It leaves a symlink <filename>result</filename> in the
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current directory that points (under
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<filename>result/bin/run-<replaceable>hostname</replaceable>-vm</filename>)
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at the script that starts the VM. Thus, to test a NixOS configuration in
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a virtual machine, you should do the following:
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<screen>
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<prompt>$ </prompt>nixos-rebuild build-vm
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<prompt>$ </prompt>./result/bin/run-*-vm
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</screen>
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</para>
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<para>
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The VM is implemented using the <literal>qemu</literal> package. For
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best performance, you should load the <literal>kvm-intel</literal> or
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<literal>kvm-amd</literal> kernel modules to get hardware
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virtualisation.
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</para>
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<para>
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The VM mounts the Nix store of the host through the 9P file system. The
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host Nix store is read-only, so Nix commands that modify the Nix store
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will not work in the VM. This includes commands such as
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<command>nixos-rebuild</command>; to change the VM’s configuration,
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you must halt the VM and re-run the commands above.
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</para>
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<para>
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The VM has its own <literal>ext3</literal> root file system, which is
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automatically created when the VM is first started, and is persistent
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across reboots of the VM. It is stored in
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<literal>./<replaceable>hostname</replaceable>.qcow2</literal>.
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<!-- The entire file system hierarchy of the host is available in
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the VM under <filename>/hostfs</filename>.-->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>build-vm-with-bootloader</option>
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</term>
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<listitem>
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<para>
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Like <option>build-vm</option>, but boots using the regular boot loader
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of your configuration (e.g., GRUB 1 or 2), rather than booting directly
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into the kernel and initial ramdisk of the system. This allows you to
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test whether the boot loader works correctly. However, it does not
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guarantee that your NixOS configuration will boot successfully on the
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host hardware (i.e., after running <command>nixos-rebuild
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switch</command>), because the hardware and boot loader configuration in
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the VM are different. The boot loader is installed on an automatically
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generated virtual disk containing a <filename>/boot</filename>
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partition.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsection>
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<refsection>
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<title>Options</title>
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<para>
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This command accepts the following options:
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</para>
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<variablelist>
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<varlistentry>
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<term>
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<option>--upgrade</option>
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</term>
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<term>
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<option>--upgrade-all</option>
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</term>
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<listitem>
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<para>
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Update the root user's channel named <literal>nixos</literal>
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before rebuilding the system.
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</para>
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<para>
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In addition to the <literal>nixos</literal> channel, the root
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user's channels which have a file named
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<literal>.update-on-nixos-rebuild</literal> in their base
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directory will also be updated.
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</para>
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<para>
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Passing <option>--upgrade-all</option> updates all of the root
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user's channels.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--install-bootloader</option>
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</term>
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<listitem>
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<para>
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Causes the boot loader to be (re)installed on the device specified by the
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relevant configuration options.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--no-build-nix</option>
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</term>
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<listitem>
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<para>
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Normally, <command>nixos-rebuild</command> first builds the
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<varname>nixUnstable</varname> attribute in Nixpkgs, and uses the
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resulting instance of the Nix package manager to build the new system
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configuration. This is necessary if the NixOS modules use features not
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provided by the currently installed version of Nix. This option disables
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building a new Nix.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--fast</option>
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</term>
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<listitem>
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<para>
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Equivalent to <option>--no-build-nix</option>. This option is
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useful if you call <command>nixos-rebuild</command> frequently
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(e.g. if you’re hacking on a NixOS module).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--rollback</option>
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</term>
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<listitem>
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<para>
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Instead of building a new configuration as specified by
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<filename>/etc/nixos/configuration.nix</filename>, roll back to the
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previous configuration. (The previous configuration is defined as the one
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before the “current” generation of the Nix profile
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<filename>/nix/var/nix/profiles/system</filename>.)
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--builders</option> <replaceable>builder-spec</replaceable>
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</term>
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<listitem>
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<para>
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Allow ad-hoc remote builders for building the new system. This requires
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the user executing <command>nixos-rebuild</command> (usually root) to be
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configured as a trusted user in the Nix daemon. This can be achieved by
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using the <literal>nix.settings.trusted-users</literal> NixOS option. Examples
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values for that option are described in the <literal>Remote builds
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chapter</literal> in the Nix manual, (i.e. <command>--builders
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"ssh://bigbrother x86_64-linux"</command>). By specifying an empty string
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existing builders specified in <filename>/etc/nix/machines</filename> can
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be ignored: <command>--builders ""</command> for example when they are
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not reachable due to network connectivity.
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||
</para>
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</listitem>
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</varlistentry>
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||
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||
<varlistentry>
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<term>
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<option>--profile-name</option>
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||
</term>
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||
<term>
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||
<option>-p</option>
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||
</term>
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||
<listitem>
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||
<para>
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||
Instead of using the Nix profile
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<filename>/nix/var/nix/profiles/system</filename> to keep track of the
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||
current and previous system configurations, use
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<filename>/nix/var/nix/profiles/system-profiles/<replaceable>name</replaceable></filename>.
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When you use GRUB 2, for every system profile created with this flag,
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NixOS will create a submenu named “NixOS - Profile
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'<replaceable>name</replaceable>'” in GRUB’s boot menu, containing
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the current and previous configurations of this profile.
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</para>
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<para>
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||
For instance, if you want to test a configuration file named
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<filename>test.nix</filename> without affecting the default system
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profile, you would do:
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<screen>
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<prompt>$ </prompt>nixos-rebuild switch -p test -I nixos-config=./test.nix
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</screen>
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The new configuration will appear in the GRUB 2 submenu “NixOS -
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Profile 'test'”.
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||
</para>
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||
</listitem>
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||
</varlistentry>
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||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--build-host</option>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Instead of building the new configuration locally, use the specified host
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||
to perform the build. The host needs to be accessible with ssh, and must
|
||
be able to perform Nix builds. If the option
|
||
<option>--target-host</option> is not set, the build will be copied back
|
||
to the local machine when done.
|
||
</para>
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||
<para>
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Note that, if <option>--no-build-nix</option> is not specified, Nix will
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||
be built both locally and remotely. This is because the configuration
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||
will always be evaluated locally even though the building might be
|
||
performed remotely.
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||
</para>
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||
<para>
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||
You can include a remote user name in the host name
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||
(<replaceable>user@host</replaceable>). You can also set ssh options by
|
||
defining the <envar>NIX_SSHOPTS</envar> environment variable.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--target-host</option>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Specifies the NixOS target host. By setting this to something other than
|
||
<replaceable>localhost</replaceable>, the system activation will happen
|
||
on the remote host instead of the local machine. The remote host needs to
|
||
be accessible over ssh, and for the commands <option>switch</option>,
|
||
<option>boot</option> and <option>test</option> you need root access.
|
||
</para>
|
||
|
||
<para>
|
||
If <option>--build-host</option> is not explicitly specified, building
|
||
will take place locally.
|
||
</para>
|
||
|
||
<para>
|
||
You can include a remote user name in the host name
|
||
(<replaceable>user@host</replaceable>). You can also set ssh options by
|
||
defining the <envar>NIX_SSHOPTS</envar> environment variable.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--use-substitutes</option>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
When set, nixos-rebuild will add <option>--use-substitutes</option>
|
||
to each invocation of nix-copy-closure. This will only affect the
|
||
behavior of nixos-rebuild if <option>--target-host</option> or
|
||
<option>--build-host</option> is also set. This is useful when
|
||
the target-host connection to cache.nixos.org is faster than the
|
||
connection between hosts.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--use-remote-sudo</option>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
When set, nixos-rebuild prefixes remote commands that run on
|
||
the <option>--build-host</option> and <option>--target-host</option>
|
||
systems with <command>sudo</command>. Setting this option allows
|
||
deploying as a non-root user.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--flake</option> <replaceable>flake-uri</replaceable><optional>#<replaceable>name</replaceable></optional>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Build the NixOS system from the specified flake. It defaults to
|
||
the directory containing the target of the symlink
|
||
<filename>/etc/nixos/flake.nix</filename>, if it exists. The
|
||
flake must contain an output named
|
||
<literal>nixosConfigurations.<replaceable>name</replaceable></literal>. If
|
||
<replaceable>name</replaceable> is omitted, it default to the
|
||
current host name.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<option>--no-flake</option>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Do not imply <option>--flake</option> if
|
||
<filename>/etc/nixos/flake.nix</filename> exists. With this
|
||
option, it is possible to build non-flake NixOS configurations
|
||
even if the current NixOS systems uses flakes.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<para>
|
||
In addition, <command>nixos-rebuild</command> accepts various Nix-related
|
||
flags, including <option>--max-jobs</option> / <option>-j</option>,
|
||
<option>--show-trace</option>, <option>--keep-failed</option>,
|
||
<option>--keep-going</option>, <option>--impure</option>, and <option>--verbose</option> /
|
||
<option>-v</option>. See the Nix manual for details.
|
||
</para>
|
||
</refsection>
|
||
|
||
<refsection>
|
||
<title>Environment</title>
|
||
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term>
|
||
<envar>NIXOS_CONFIG</envar>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Path to the main NixOS configuration module. Defaults to
|
||
<filename>/etc/nixos/configuration.nix</filename>.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<envar>NIX_SSHOPTS</envar>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
Additional options to be passed to <command>ssh</command> on the command
|
||
line.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</refsection>
|
||
|
||
<refsection>
|
||
<title>Files</title>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<filename>/etc/nixos/flake.nix</filename>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
If this file exists, then <command>nixos-rebuild</command> will
|
||
use it as if the <option>--flake</option> option was given. This
|
||
file may be a symlink to a <filename>flake.nix</filename> in an
|
||
actual flake; thus <filename>/etc/nixos</filename> need not be a
|
||
flake.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<filename>/run/current-system</filename>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
A symlink to the currently active system configuration in the Nix store.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>
|
||
<filename>/nix/var/nix/profiles/system</filename>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
The Nix profile that contains the current and previous system
|
||
configurations. Used to generate the GRUB boot menu.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
</refsection>
|
||
|
||
<refsection>
|
||
<title>Bugs</title>
|
||
<para>
|
||
This command should be renamed to something more descriptive.
|
||
</para>
|
||
</refsection>
|
||
</refentry>
|