forked from mirrors/nixpkgs
nixos-option: enable all flags by default and make output a bit readable cc @nbp
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@ -17,11 +17,6 @@
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-option</command>
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<group choice="opt">
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<option>-v</option>
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<option>-d</option>
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<option>-l</option>
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</group>
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<arg choice='plain'><replaceable>option.name</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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@ -31,50 +26,13 @@
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<para>This command evaluates the configuration specified in
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<filename>/etc/nixos/configuration.nix</filename> and returns the properties
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of the option name given as argument. By default, it returns the value of
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the option.</para>
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of the option name given as argument.</para>
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<para>When the option name is not an option, the command prints the list of
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attributes contained in the attribute set.</para>
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</refsection>
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<refsection><title>Options</title>
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<para>This command accepts the following options:</para>
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<variablelist>
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<varlistentry>
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<term><option>--value</option>, <option>-v</option></term>
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<listitem>
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<para>Returns the value of the option. This is the default operation
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if no other options are defined.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--description</option>, <option>-d</option></term>
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<listitem>
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<para>Return the default value, the example and the description of the
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option when available.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--lookup</option>, <option>-l</option></term>
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<listitem>
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<para>Return the locations where the option is declared and where it
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is defined. This is extremely useful to find sources of errors in
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your configuration.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Environment</title>
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<variablelist>
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@ -103,27 +61,21 @@ grub
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initScript
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$ nixos-option boot.loader.grub.enable
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true</screen></para>
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Value:
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true
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<para>Prints option information:
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Default:
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true
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<screen>$ nixos-option -d networking.hostName
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Default: "nixos"
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Description:
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The name of the machine. Leave it empty if you want to obtain
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it from a DHCP server (if using DHCP).</screen></para>
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Whether to enable the GNU GRUB boot loader.
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<para>Find the locations which are declaring and defining an option:
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<screen>$ nixos-option -l hardware.firmware
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Declared by:
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/mnt/data/nix-sources/nixos/modules/services/hardware/udev.nix
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"/path/to/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
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Defined by:
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/path/to/nixpkgs/nixos/modules/system/boot/kernel.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/rt73.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/intel-3945abg.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/intel-2200bg.nix</screen></para>
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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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</screen></para>
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</refsection>
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@ -11,9 +11,6 @@ usage () {
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# Process Arguments #
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#####################
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desc=false
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defs=false
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value=false
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xml=false
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verbose=false
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@ -24,14 +21,11 @@ for arg; do
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if test -z "$argfun"; then
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case $arg in
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-*)
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longarg=""
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sarg="$arg"
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longarg=""
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while test "$sarg" != "-"; do
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case $sarg in
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--*) longarg=$arg; sarg="--";;
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-d*) longarg="$longarg --description";;
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-v*) longarg="$longarg --value";;
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-l*) longarg="$longarg --lookup";;
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-*) usage;;
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esac
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# remove the first letter option
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@ -42,9 +36,6 @@ for arg; do
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esac
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for larg in $longarg; do
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case $larg in
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--description) desc=true;;
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--value) value=true;;
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--lookup) defs=true;;
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--xml) xml=true;;
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--verbose) verbose=true;;
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--help) usage;;
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@ -67,16 +58,6 @@ for arg; do
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fi
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done
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if $xml; then
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value=true
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desc=true
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defs=true
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fi
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if ! $defs && ! $desc; then
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value=true
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fi
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if $verbose; then
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set -x
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else
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@ -95,8 +76,7 @@ evalAttr(){
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local prefix="$1"
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local strict="$2"
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local suffix="$3"
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echo "(import <nixos> {}).$prefix${option:+.$option}${suffix:+.$suffix}" |
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evalNix ${strict:+--strict}
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echo "(import <nixos> {}).$prefix${option:+.$option}${suffix:+.$suffix}" | evalNix ${strict:+--strict}
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}
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evalOpt(){
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@ -189,35 +169,35 @@ EOF
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fi
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if test "$(evalOpt "_type" 2> /dev/null)" = '"option"'; then
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$value && evalCfg 1
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echo "Value:"
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evalCfg 1
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if $desc; then
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$value && echo;
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echo
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if default=$(evalOpt "default" - 2> /dev/null); then
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echo "Default: $default"
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else
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echo "Default: <None>"
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fi
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if example=$(evalOpt "example" - 2> /dev/null); then
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echo "Example: $example"
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fi
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echo "Description:"
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eval printf $(evalOpt "description")
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echo "Default:"
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if default=$(evalOpt "default" - 2> /dev/null); then
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echo "$default"
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else
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echo "<None>"
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fi
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if $defs; then
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$desc || $value && echo;
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printPath () { echo " $1"; }
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echo "Declared by:"
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nixMap printPath "$(findSources "declarations")"
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echo ""
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echo "Defined by:"
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nixMap printPath "$(findSources "files")"
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echo ""
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echo
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if example=$(evalOpt "example" - 2> /dev/null); then
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echo "Example: $example"
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fi
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echo "Description:"
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echo
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eval printf $(evalOpt "description")
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echo $desc;
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printPath () { echo " $1"; }
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echo "Declared by:"
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nixMap printPath "$(findSources "declarations")"
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echo
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echo "Defined by:"
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nixMap printPath "$(findSources "files")"
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echo
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else
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# echo 1>&2 "Warning: This value is not an option."
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