320 lines
6.9 KiB
Bash
320 lines
6.9 KiB
Bash
#! @shell@ -e
|
|
|
|
# FIXME: rewrite this in a more suitable language.
|
|
|
|
usage () {
|
|
exec man nixos-option
|
|
exit 1
|
|
}
|
|
|
|
#####################
|
|
# Process Arguments #
|
|
#####################
|
|
|
|
xml=false
|
|
verbose=false
|
|
nixPath=""
|
|
|
|
option=""
|
|
|
|
argfun=""
|
|
for arg; do
|
|
if test -z "$argfun"; then
|
|
case $arg in
|
|
-*)
|
|
sarg="$arg"
|
|
longarg=""
|
|
while test "$sarg" != "-"; do
|
|
case $sarg in
|
|
--*) longarg=$arg; sarg="--";;
|
|
-I) argfun="include_nixpath";;
|
|
-*) usage;;
|
|
esac
|
|
# remove the first letter option
|
|
sarg="-${sarg#??}"
|
|
done
|
|
;;
|
|
*) longarg=$arg;;
|
|
esac
|
|
for larg in $longarg; do
|
|
case $larg in
|
|
--xml) xml=true;;
|
|
--verbose) verbose=true;;
|
|
--help) usage;;
|
|
-*) usage;;
|
|
*) if test -z "$option"; then
|
|
option="$larg"
|
|
else
|
|
usage
|
|
fi;;
|
|
esac
|
|
done
|
|
else
|
|
case $argfun in
|
|
set_*)
|
|
var=$(echo $argfun | sed 's,^set_,,')
|
|
eval $var=$arg
|
|
;;
|
|
include_nixpath)
|
|
nixPath="-I $arg $nixPath"
|
|
;;
|
|
esac
|
|
argfun=""
|
|
fi
|
|
done
|
|
|
|
if $verbose; then
|
|
set -x
|
|
else
|
|
set +x
|
|
fi
|
|
|
|
#############################
|
|
# Process the configuration #
|
|
#############################
|
|
|
|
evalNix(){
|
|
result=$(nix-instantiate ${nixPath:+$nixPath} - --eval-only "$@" 2>&1)
|
|
if test $? -eq 0; then
|
|
cat <<EOF
|
|
$result
|
|
EOF
|
|
return 0;
|
|
else
|
|
sed -n '
|
|
/^error/ { s/, at (string):[0-9]*:[0-9]*//; p; };
|
|
/^warning: Nix search path/ { p; };
|
|
' <<EOF
|
|
$result
|
|
EOF
|
|
return 1;
|
|
fi
|
|
}
|
|
|
|
header="let
|
|
nixos = import <nixpkgs/nixos> {};
|
|
nixpkgs = import <nixpkgs> {};
|
|
in with nixpkgs.lib;
|
|
"
|
|
|
|
# This function is used for converting the option definition path given by
|
|
# the user into accessors for reaching the definition and the declaration
|
|
# corresponding to this option.
|
|
generateAccessors(){
|
|
if result=$(evalNix --strict --show-trace <<EOF
|
|
$header
|
|
|
|
let
|
|
path = "${option:+$option}";
|
|
pathList = splitString "." path;
|
|
|
|
walkOptions = attrsNames: result:
|
|
if attrsNames == [] then
|
|
result
|
|
else
|
|
let name = head attrsNames; rest = tail attrsNames; in
|
|
if isOption result.options then
|
|
walkOptions rest {
|
|
options = result.options.type.getSubOptions "";
|
|
opt = ''(\${result.opt}.type.getSubOptions "")'';
|
|
cfg = ''\${result.cfg}."\${name}"'';
|
|
}
|
|
else
|
|
walkOptions rest {
|
|
options = result.options.\${name};
|
|
opt = ''\${result.opt}."\${name}"'';
|
|
cfg = ''\${result.cfg}."\${name}"'';
|
|
}
|
|
;
|
|
|
|
walkResult = (if path == "" then x: x else walkOptions pathList) {
|
|
options = nixos.options;
|
|
opt = ''nixos.options'';
|
|
cfg = ''nixos.config'';
|
|
};
|
|
|
|
in
|
|
''let option = \${walkResult.opt}; config = \${walkResult.cfg}; in''
|
|
EOF
|
|
)
|
|
then
|
|
echo $result
|
|
else
|
|
# In case of error we want to ignore the error message roduced by the
|
|
# script above, as it is iterating over each attribute, which does not
|
|
# produce a nice error message. The following code is a fallback
|
|
# solution which is cause a nicer error message in the next
|
|
# evaluation.
|
|
echo "\"let option = nixos.options${option:+.$option}; config = nixos.config${option:+.$option}; in\""
|
|
fi
|
|
}
|
|
|
|
header="$header
|
|
$(eval echo $(generateAccessors))
|
|
"
|
|
|
|
evalAttr(){
|
|
local prefix="$1"
|
|
local strict="$2"
|
|
local suffix="$3"
|
|
|
|
# If strict is set, then set it to "true".
|
|
test -n "$strict" && strict=true
|
|
|
|
evalNix ${strict:+--strict} <<EOF
|
|
$header
|
|
|
|
let
|
|
value = $prefix${suffix:+.$suffix};
|
|
strict = ${strict:-false};
|
|
cleanOutput = x: with nixpkgs.lib;
|
|
if isDerivation x then x.outPath
|
|
else if isFunction x then "<CODE>"
|
|
else if strict then
|
|
if isAttrs x then mapAttrs (n: cleanOutput) x
|
|
else if isList x then map cleanOutput x
|
|
else x
|
|
else x;
|
|
in
|
|
cleanOutput value
|
|
EOF
|
|
}
|
|
|
|
evalOpt(){
|
|
evalAttr "option" "" "$@"
|
|
}
|
|
|
|
evalCfg(){
|
|
local strict="$1"
|
|
evalAttr "config" "$strict"
|
|
}
|
|
|
|
findSources(){
|
|
local suffix=$1
|
|
evalNix --strict <<EOF
|
|
$header
|
|
|
|
option.$suffix
|
|
EOF
|
|
}
|
|
|
|
# Given a result from nix-instantiate, recover the list of attributes it
|
|
# contains.
|
|
attrNames() {
|
|
local attributeset=$1
|
|
# sed is used to replace un-printable subset by 0s, and to remove most of
|
|
# the inner-attribute set, which reduce the likelyhood to encounter badly
|
|
# pre-processed input.
|
|
echo "builtins.attrNames $attributeset" | \
|
|
sed 's,<[A-Z]*>,0,g; :inner; s/{[^\{\}]*};/0;/g; t inner;' | \
|
|
evalNix --strict
|
|
}
|
|
|
|
# map a simple list which contains strings or paths.
|
|
nixMap() {
|
|
local fun="$1"
|
|
local list="$2"
|
|
local elem
|
|
for elem in $list; do
|
|
test $elem = '[' -o $elem = ']' && continue;
|
|
$fun $elem
|
|
done
|
|
}
|
|
|
|
# This duplicates 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
|
|
$header
|
|
|
|
let
|
|
sources = builtins.map (f: f.source);
|
|
opt = option;
|
|
cfg = 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.description; }
|
|
// 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
|
|
echo "Value:"
|
|
evalCfg 1
|
|
|
|
echo
|
|
|
|
echo "Default:"
|
|
if default=$(evalOpt "default" - 2> /dev/null); then
|
|
echo "$default"
|
|
else
|
|
echo "<None>"
|
|
fi
|
|
echo
|
|
if example=$(evalOpt "example" - 2> /dev/null); then
|
|
echo "Example:"
|
|
echo "$example"
|
|
echo
|
|
fi
|
|
echo "Description:"
|
|
echo
|
|
echo $(evalOpt "description")
|
|
|
|
echo $desc;
|
|
|
|
printPath () { echo " $1"; }
|
|
|
|
echo "Declared by:"
|
|
nixMap printPath "$(findSources "declarations")"
|
|
echo
|
|
echo "Defined by:"
|
|
nixMap printPath "$(findSources "files")"
|
|
echo
|
|
|
|
else
|
|
# echo 1>&2 "Warning: This value is not an option."
|
|
|
|
result=$(evalCfg "")
|
|
if names=$(attrNames "$result" 2> /dev/null); then
|
|
echo 1>&2 "This attribute set contains:"
|
|
escapeQuotes () { eval echo "$1"; }
|
|
nixMap escapeQuotes "$names"
|
|
else
|
|
echo 1>&2 "An error occurred while looking for attribute names."
|
|
echo $result
|
|
fi
|
|
fi
|