93 lines
1.8 KiB
Groff
93 lines
1.8 KiB
Groff
.Dd January 1, 1980
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.\" nixpkgs groff will use Nixpkgs as the OS in the title by default, taking it from
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.\" doc-default-operating-system. mandoc doesn't have this register set by default,
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.\" so we can use it as a groff/mandoc switch.
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.ie ddoc-default-operating-system .Dt nixos-option \&8 "NixOS System Manager's Manual"
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.el .Dt nixos-option 8
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.Os NixOS
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.Sh NAME
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.Nm nixos-option
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.Nd inspect a NixOS configuration
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.
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.
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.
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.Sh SYNOPSIS
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.Nm
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.Op Fl r | -recursive
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.Op Fl I Ar path
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.Ar option.name
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.
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.
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.
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.Sh DESCRIPTION
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This command evaluates the configuration specified in
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.Pa /etc/nixos/configuration.nix
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and returns the properties of the option name given as argument.
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.
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.Pp
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When the option name is not an option, the command prints the list of attributes
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contained in the attribute set.
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.
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.
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.
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.Sh OPTIONS
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.Bl -tag -width indent
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.It Fl r , -recursive
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Print all the values at or below the specified path recursively.
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.
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.It Fl I Ar path
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This option is passed to the underlying
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.Xr nix-instantiate 1
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invocation.
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.El
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.
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.
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.
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.Sh ENVIRONMENT
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.Bl -tag -width indent
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.It Ev NIXOS_CONFIG
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Path to the main NixOS configuration module. Defaults to
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.Pa /etc/nixos/configuration.nix Ns
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\&.
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.El
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.
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.
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.
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.Sh EXAMPLES
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Investigate option values:
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.Bd -literal -offset indent
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$ nixos-option boot.loader
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This attribute set contains:
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generationsDir
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grub
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initScript
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$ nixos-option boot.loader.grub.enable
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Value:
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true
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Default:
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true
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Description:
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Whether to enable the GNU GRUB boot loader.
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Declared by:
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"/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
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Defined by:
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"/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
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.Ed
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.
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.
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.
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.Sh SEE ALSO
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.Xr configuration.nix 5
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.
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.
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.
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.Sh AUTHORS
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.An -nosplit
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.An Nicolas Pierron
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and
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.An the Nixpkgs/NixOS contributors
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