400 lines
9.7 KiB
Bash
400 lines
9.7 KiB
Bash
#! @shell@ -e
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# Allow the location of NixOS sources and the system configuration
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# file to be overridden.
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: ${mountPoint=/mnt}
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: ${NIXOS_CONFIG=/etc/nixos/configuration.nix}
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export NIXOS_CONFIG
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usage () {
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echo 1>&2 "
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Usage: $0 [--install] [-v] [-d] [-l] [--xml] OPTION_NAME
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$0 [--install]
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This program is used to explore NixOS options by looking at their values or
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by looking at their description. It is helpful for understanding how your
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configuration is working.
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Options:
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-i | --install Use the configuration on
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${mountPoint:+$mountPoint/}$NIXOS_CONFIG instead of
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the current system configuration. Generate a
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template configuration if no option name is
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specified.
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-v | --value Display the current value, based on your
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configuration.
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-d | --description Display the default value, the example and the
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description.
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-l | --lookup Display where the option is defined and where it
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is declared.
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--xml Print an XML representation of the result.
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Implies -vdl options.
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--help Show this message.
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Environment variables affecting $0:
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\$mountPoint Path to the target file system.
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\$NIXOS_CONFIG Path to your configuration file.
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"
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exit 1;
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}
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#####################
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# Process Arguments #
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#####################
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desc=false
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defs=false
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value=false
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xml=false
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install=false
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verbose=false
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option=""
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argfun=""
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for arg; do
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if test -z "$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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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="$longarg --lookup";;
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-i*) longarg="$longarg --install";;
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-*) usage;;
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esac
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# remove the first letter option
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sarg="-${sarg#??}"
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done
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;;
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*) longarg=$arg;;
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esac
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for larg in $longarg; do
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case $larg in
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--description) desc=true;;
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--value) value=true;;
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--lookup) defs=true;;
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--xml) xml=true;;
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--install) install=true;;
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--verbose) verbose=true;;
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--help) usage;;
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-*) usage;;
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*) if test -z "$option"; then
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option="$larg"
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else
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usage
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fi;;
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esac
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done
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else
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case $argfun in
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set_*)
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var=$(echo $argfun | sed 's,^set_,,')
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eval $var=$arg
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;;
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esac
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argfun=""
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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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# --install cannot be used with -d -v -l without option name.
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if $value || $desc || $defs && $install && test -z "$option"; then
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usage
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fi
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generate=false
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if ! $defs && ! $desc && ! $value && $install && test -z "$option"; then
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generate=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 $verbose; then
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set -x
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else
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set +x
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fi
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#############################
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# Process the configuration #
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#############################
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evalNix(){
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nix-instantiate - --eval-only "$@"
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}
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evalAttr(){
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local prefix=$1
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local suffix=$2
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local strict=$3
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echo "(import <nixos> {}).$prefix${option:+.$option}${suffix:+.$suffix}" |
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evalNix ${strict:+--strict}
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}
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evalOpt(){
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evalAttr "eval.options" "$@"
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}
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evalCfg(){
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evalAttr "config" "$@"
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}
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findSources(){
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local suffix=$1
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echo "builtins.map (f: f.source) (import <nixos> {}).eval.options${option:+.$option}.$suffix" |
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evalNix --strict
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}
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# Given a result from nix-instantiate, recover the list of attributes it
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# contains.
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attrNames() {
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local attributeset=$1
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# sed is used to replace un-printable subset by 0s, and to remove most of
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# the inner-attribute set, which reduce the likelyhood to encounter badly
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# pre-processed input.
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echo "builtins.attrNames $attributeset" | \
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sed 's,<[A-Z]*>,0,g; :inner; s/{[^\{\}]*};/0;/g; t inner;' | \
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evalNix --strict
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}
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# map a simple list which contains strings or paths.
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nixMap() {
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local fun="$1"
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local list="$2"
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local elem
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for elem in $list; do
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test $elem = '[' -o $elem = ']' && continue;
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$fun $elem
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done
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}
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if $install; then
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NIXOS_CONFIG="$mountPoint$NIXOS_CONFIG"
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fi
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if $generate; then
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mkdir -p $(dirname "$NIXOS_CONFIG")
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# Scan the hardware and add the result to /etc/nixos/hardware-scan.nix.
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hardware_config="${NIXOS_CONFIG%/configuration.nix}/hardware-configuration.nix"
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if test -e "$hardware_config"; then
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echo "A hardware configuration file exists, generation skipped."
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else
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echo "Scan your hardware to generate a hardware configuration file."
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nixos-hardware-scan > "$hardware_config"
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fi
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if test -e "$NIXOS_CONFIG"; then
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echo 1>&2 "error: Cannot generate a template configuration because a configuration file exists."
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exit 1
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fi
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echo "Generate a template configuration that you should edit."
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# Generate a template configuration file where the user has to
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# fill the gaps.
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echo > "$NIXOS_CONFIG" \
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'# Edit this configuration file which defines what would be installed on the
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# system. To Help while choosing option value, you can watch at the manual
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# page of configuration.nix or at the last chapter of the manual available
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# on the virtual console 8 (Alt+F8).
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{config, pkgs, ...}:
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{
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require = [
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# Include the configuration for part of your system which have been
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# detected automatically.
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./hardware-configuration.nix
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];
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boot.initrd.kernelModules = [
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# Specify all kernel modules that are necessary for mounting the root
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# file system.
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#
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# "ext4" "ata_piix"
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];
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boot.loader.grub = {
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# Use grub 2 as boot loader.
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enable = true;
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version = 2;
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# Define on which hard drive you want to install Grub.
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# device = "/dev/sda";
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};
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networking = {
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# hostName = "nixos"; # Define your hostname.
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wireless.enable = true; # Enables Wireless.
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};
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# Add file system entries for each partition that you want to see mounted
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# at boot time. You can add filesystems which are not mounted at boot by
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# adding the noauto option.
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fileSystems = [
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# Mount the root file system
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#
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# { mountPoint = "/";
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# device = "/dev/sda2";
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# }
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# Copy & Paste & Uncomment & Modify to add any other file system.
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#
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# { mountPoint = "/data"; # where you want to mount the device
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# device = "/dev/sdb"; # the device or the label of the device
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# # label = "data";
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# fsType = "ext3"; # the type of the partition.
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# options = "data=journal";
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# }
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];
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swapDevices = [
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# List swap partitions that are mounted at boot time.
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#
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# { device = "/dev/sda1"; }
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];
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# Select internationalisation properties.
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# i18n = {
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# consoleFont = "lat9w-16";
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# consoleKeyMap = "us";
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# defaultLocale = "en_US.UTF-8";
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# };
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# List services that you want to enable:
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# Add an OpenSSH daemon.
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# services.openssh.enable = true;
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# Add CUPS to print documents.
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# services.printing.enable = true;
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# Add XServer (default if you have used a graphical iso)
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# services.xserver = {
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# enable = true;
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# layout = "us";
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# xkbOptions = "eurosign:e";
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# };
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# Add the NixOS Manual on virtual console 8
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services.nixosManual.showManual = true;
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}
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'
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exit 0
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fi;
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# This dupplicate the work made below, but it is useful for processing the
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# output of nixos-option with other tools such as nixos-gui.
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if $xml; then
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evalNix --xml --no-location <<EOF
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let
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reach = attrs: attrs${option:+.$option};
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nixos = import <nixos> {};
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nixpkgs = import <nixpkgs> {};
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sources = builtins.map (f: f.source);
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opt = reach nixos.eval.options;
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cfg = reach nixos.config;
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in
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with nixpkgs.lib;
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let
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optStrict = v:
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let
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traverse = x :
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if isAttrs x then
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if x ? outPath then true
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else all id (mapAttrsFlatten (n: traverseNoAttrs) x)
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else traverseNoAttrs x;
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traverseNoAttrs = x:
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# do not continue in attribute sets
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if isAttrs x then true
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else if isList x then all id (map traverse x)
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else true;
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in assert traverse v; v;
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in
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if isOption opt then
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optStrict ({}
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// optionalAttrs (opt ? default) { inherit (opt) default; }
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// optionalAttrs (opt ? example) { inherit (opt) example; }
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// optionalAttrs (opt ? description) { inherit (opt) description; }
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// optionalAttrs (opt ? type) { typename = opt.type.name; }
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// optionalAttrs (opt ? options) { inherit (opt) options; }
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// {
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# to disambiguate the xml output.
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_isOption = true;
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declarations = sources opt.declarations;
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definitions = sources opt.definitions;
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value = cfg;
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})
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else
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opt
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EOF
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exit $?
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fi
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if test "$(evalOpt "_type" 2> /dev/null)" = '"option"'; then
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$value && evalCfg;
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if $desc; then
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$value && 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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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 "$(findSources "definitions")"
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echo ""
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fi
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else
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# echo 1>&2 "Warning: This value is not an option."
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result=$(evalCfg)
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if names=$(attrNames "$result" 2> /dev/null); then
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echo 1>&2 "This attribute set contains:"
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escapeQuotes () { eval echo "$1"; }
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nixMap escapeQuotes "$names"
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else
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echo 1>&2 "An error occured while looking for attribute names."
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echo $result
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fi
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fi
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