Author: NicolasPierron
Date: Sun Apr 24 15:30:25 2011
New Revision: 26950
URL: https://svn.nixos.org/websvn/nix/?rev=26950&sc=1
Log:
nixos-option: Add xml output to reduce the effort in nixos-gui.
Modified:
nixos/trunk/modules/installer/tools/nixos-option.sh
Modified: nixos/trunk/modules/installer/tools/nixos-option.sh
==============================================================================
--- nixos/trunk/modules/installer/tools/nixos-option.sh Sun Apr 24 14:32:55
2011 (r26949)
+++ nixos/trunk/modules/installer/tools/nixos-option.sh Sun Apr 24 15:30:25
2011 (r26950)
@@ -11,7 +11,7 @@
usage () {
echo 1>&2 "
-Usage: $0 [--install] [-v] [-d] [-l] OPTION_NAME
+Usage: $0 [--install] [-v] [-d] [-l] [--xml] OPTION_NAME
$0 [--install]
This program is used to explore NixOS options by looking at their values or
@@ -31,6 +31,8 @@
description.
-l | --lookup Display where the option is defined and where it
is declared.
+ --xml Print an XML representation of the result.
+ Implies -vdl options.
--help Show this message.
Environment variables affecting $0:
@@ -52,6 +54,7 @@
desc=false
defs=false
value=false
+xml=false
install=false
verbose=false
@@ -84,6 +87,7 @@
--description) desc=true;;
--value) value=true;;
--lookup) defs=true;;
+ --xml) xml=true;;
--install) install=true;;
--verbose) verbose=true;;
--help) usage;;
@@ -106,6 +110,12 @@
fi
done
+if $xml; then
+ value=true
+ desc=true
+ defs=true
+fi
+
# --install cannot be used with -d -v -l without option name.
if $value || $desc || $defs && $install && test -z "$option"; then
usage
@@ -130,12 +140,16 @@
# Process the configuration #
#############################
+evalNix(){
+ nix-instantiate - --eval-only "$@"
+}
+
evalAttr(){
local prefix=$1
local suffix=$2
local strict=$3
echo "(import $NIXOS {}).$prefix${option:+.$option}${suffix:+.$suffix}" |
- nix-instantiate - --eval-only ${strict:+--strict}
+ evalNix ${strict:+--strict}
}
evalOpt(){
@@ -149,7 +163,7 @@
findSources(){
local suffix=$1
echo "builtins.map (f: f.source) (import $NIXOS
{}).eval.options${option:+.$option}.$suffix" |
- nix-instantiate - --eval-only --strict
+ evalNix --strict
}
if $install; then
@@ -277,6 +291,57 @@
exit 0
fi;
+# This dupplicate the work made below, but it is useful for processing the
+# output of nixos-option with other tools such as nixos-gui.
+if $xml; then
+ evalNix --xml --no-location <<EOF
+let
+ reach = attrs: attrs${option:+.$option};
+ nixos = import $NIXOS {};
+ nixpkgs = import $NIXPKGS {};
+ sources = builtins.map (f: f.source);
+ opt = reach nixos.eval.options;
+ cfg = reach nixos.config;
+in
+
+with nixpkgs.lib;
+
+let
+ optStrict = v:
+ let
+ traverse = x :
+ if isAttrs x then
+ if x ? outPath then true
+ else all id (mapAttrsFlatten (n: traverseNoAttrs) x)
+ else traverseNoAttrs x;
+ traverseNoAttrs = x:
+ # do not continue in attribute sets
+ if isAttrs x then true
+ else if isList x then all id (map traverse x)
+ else true;
+ in assert traverse v; v;
+in
+
+if isOption opt then
+ optStrict ({}
+ // optionalAttrs (opt ? default) { inherit (opt) default; }
+ // optionalAttrs (opt ? example) { inherit (opt) example; }
+ // optionalAttrs (opt ? description) { inherit (opt) description; }
+ // optionalAttrs (opt ? type) { typename = opt.type.name; }
+ // optionalAttrs (opt ? options) { inherit (opt) options; }
+ // {
+ # to disambiguate the xml output.
+ _isOption = true;
+ declarations = sources opt.declarations;
+ definitions = sources opt.definitions;
+ value = cfg;
+ })
+else
+ opt
+EOF
+ exit $?
+fi
+
if test "$(evalOpt "_type" 2> /dev/null)" = '"option"'; then
$value && evalCfg;
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