nixpkgs/lib/tests/modules.sh
Maximilian Bosch e878fc4aac
lib/modules: better error message if an attr-set of options is expected
I recently wrote some Nix code where I wrongly set a value to an option
which wasn't an actual option, but an attr-set of options. The mistake I
made can be demonstrated with an expression like this:

    {
      foo = { lib, pkgs, config, ... }: with lib; {
        options.foo.bar.baz = mkOption {
          type = types.str;
        };
        config.foo.bar = 23;
      };
    }

While it wasn't too hard to find the cause of the mistake for me, it was
necessary to have some practice in reading stack traces from the module
system since the eval-error I got was not very helpful:

    error: --- TypeError --------------------------------------------------------- nix-build
    at: (323:25) in file: /nix/store/3nm31brdz95pj8gch5gms6xwqh0xx55c-source/lib/modules.nix

       322|         foldl' (acc: module:
       323|                 acc // (mapAttrs (n: v:
          |                         ^
       324|                                    (acc.${n} or []) ++ f module v

    value is an integer while a set was expected
    (use '--show-trace' to show detailed location information)

I figured that such an error can be fairly confusing for someone who's
new to NixOS, so I decided to catch this case in th `byName` function in
`lib/modules.nix` by checking if the value to map through is an actual
attr-set. If not, a different error will be thrown.
2021-03-11 14:55:56 +01:00

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#!/bin/sh
#
# This script is used to test that the module system is working as expected.
# By default it test the version of nixpkgs which is defined in the NIX_PATH.
# https://stackoverflow.com/a/246128/6605742
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
cd "$DIR"/modules
pass=0
fail=0
evalConfig() {
local attr=$1
shift;
local script="import ./default.nix { modules = [ $@ ];}"
nix-instantiate --timeout 1 -E "$script" -A "$attr" --eval-only --show-trace --read-write-mode
}
reportFailure() {
local attr=$1
shift;
local script="import ./default.nix { modules = [ $@ ];}"
echo 2>&1 "$ nix-instantiate -E '$script' -A '$attr' --eval-only"
evalConfig "$attr" "$@"
fail=$((fail + 1))
}
checkConfigOutput() {
local outputContains=$1
shift;
if evalConfig "$@" 2>/dev/null | grep --silent "$outputContains" ; then
pass=$((pass + 1))
return 0;
else
echo 2>&1 "error: Expected result matching '$outputContains', while evaluating"
reportFailure "$@"
return 1
fi
}
checkConfigError() {
local errorContains=$1
local err=""
shift;
if err==$(evalConfig "$@" 2>&1 >/dev/null); then
echo 2>&1 "error: Expected error code, got exit code 0, while evaluating"
reportFailure "$@"
return 1
else
if echo "$err" | grep -zP --silent "$errorContains" ; then
pass=$((pass + 1))
return 0;
else
echo 2>&1 "error: Expected error matching '$errorContains', while evaluating"
reportFailure "$@"
return 1
fi
fi
}
# Check boolean option.
checkConfigOutput "false" config.enable ./declare-enable.nix
checkConfigError 'The option .* does not exist. Definition values:\n- In .*: true' config.enable ./define-enable.nix
# Check integer types.
# unsigned
checkConfigOutput "42" config.value ./declare-int-unsigned-value.nix ./define-value-int-positive.nix
checkConfigError 'A definition for option .* is not of type.*unsigned integer.*. Definition values:\n- In .*: -23' config.value ./declare-int-unsigned-value.nix ./define-value-int-negative.nix
# positive
checkConfigError 'A definition for option .* is not of type.*positive integer.*. Definition values:\n- In .*: 0' config.value ./declare-int-positive-value.nix ./define-value-int-zero.nix
# between
checkConfigOutput "42" config.value ./declare-int-between-value.nix ./define-value-int-positive.nix
checkConfigError 'A definition for option .* is not of type.*between.*-21 and 43.*inclusive.*. Definition values:\n- In .*: -23' config.value ./declare-int-between-value.nix ./define-value-int-negative.nix
# Check either types
# types.either
checkConfigOutput "42" config.value ./declare-either.nix ./define-value-int-positive.nix
checkConfigOutput "\"24\"" config.value ./declare-either.nix ./define-value-string.nix
# types.oneOf
checkConfigOutput "42" config.value ./declare-oneOf.nix ./define-value-int-positive.nix
checkConfigOutput "[ ]" config.value ./declare-oneOf.nix ./define-value-list.nix
checkConfigOutput "\"24\"" config.value ./declare-oneOf.nix ./define-value-string.nix
# Check mkForce without submodules.
set -- config.enable ./declare-enable.nix ./define-enable.nix
checkConfigOutput "true" "$@"
checkConfigOutput "false" "$@" ./define-force-enable.nix
checkConfigOutput "false" "$@" ./define-enable-force.nix
# Check mkForce with option and submodules.
checkConfigError 'attribute .*foo.* .* not found' config.attrsOfSub.foo.enable ./declare-attrsOfSub-any-enable.nix
checkConfigOutput 'false' config.attrsOfSub.foo.enable ./declare-attrsOfSub-any-enable.nix ./define-attrsOfSub-foo.nix
set -- config.attrsOfSub.foo.enable ./declare-attrsOfSub-any-enable.nix ./define-attrsOfSub-foo-enable.nix
checkConfigOutput 'true' "$@"
checkConfigOutput 'false' "$@" ./define-force-attrsOfSub-foo-enable.nix
checkConfigOutput 'false' "$@" ./define-attrsOfSub-force-foo-enable.nix
checkConfigOutput 'false' "$@" ./define-attrsOfSub-foo-force-enable.nix
checkConfigOutput 'false' "$@" ./define-attrsOfSub-foo-enable-force.nix
# Check overriding effect of mkForce on submodule definitions.
checkConfigError 'attribute .*bar.* .* not found' config.attrsOfSub.bar.enable ./declare-attrsOfSub-any-enable.nix ./define-attrsOfSub-foo.nix
checkConfigOutput 'false' config.attrsOfSub.bar.enable ./declare-attrsOfSub-any-enable.nix ./define-attrsOfSub-foo.nix ./define-attrsOfSub-bar.nix
set -- config.attrsOfSub.bar.enable ./declare-attrsOfSub-any-enable.nix ./define-attrsOfSub-foo.nix ./define-attrsOfSub-bar-enable.nix
checkConfigOutput 'true' "$@"
checkConfigError 'attribute .*bar.* .* not found' "$@" ./define-force-attrsOfSub-foo-enable.nix
checkConfigError 'attribute .*bar.* .* not found' "$@" ./define-attrsOfSub-force-foo-enable.nix
checkConfigOutput 'true' "$@" ./define-attrsOfSub-foo-force-enable.nix
checkConfigOutput 'true' "$@" ./define-attrsOfSub-foo-enable-force.nix
# Check mkIf with submodules.
checkConfigError 'attribute .*foo.* .* not found' config.attrsOfSub.foo.enable ./declare-enable.nix ./declare-attrsOfSub-any-enable.nix
set -- config.attrsOfSub.foo.enable ./declare-enable.nix ./declare-attrsOfSub-any-enable.nix
checkConfigError 'attribute .*foo.* .* not found' "$@" ./define-if-attrsOfSub-foo-enable.nix
checkConfigError 'attribute .*foo.* .* not found' "$@" ./define-attrsOfSub-if-foo-enable.nix
checkConfigError 'attribute .*foo.* .* not found' "$@" ./define-attrsOfSub-foo-if-enable.nix
checkConfigOutput 'false' "$@" ./define-attrsOfSub-foo-enable-if.nix
checkConfigOutput 'true' "$@" ./define-enable.nix ./define-if-attrsOfSub-foo-enable.nix
checkConfigOutput 'true' "$@" ./define-enable.nix ./define-attrsOfSub-if-foo-enable.nix
checkConfigOutput 'true' "$@" ./define-enable.nix ./define-attrsOfSub-foo-if-enable.nix
checkConfigOutput 'true' "$@" ./define-enable.nix ./define-attrsOfSub-foo-enable-if.nix
# Check disabledModules with config definitions and option declarations.
set -- config.enable ./define-enable.nix ./declare-enable.nix
checkConfigOutput "true" "$@"
checkConfigOutput "false" "$@" ./disable-define-enable.nix
checkConfigError "The option .*enable.* does not exist. Definition values:\n- In .*: true" "$@" ./disable-declare-enable.nix
checkConfigError "attribute .*enable.* in selection path .*config.enable.* not found" "$@" ./disable-define-enable.nix ./disable-declare-enable.nix
checkConfigError "attribute .*enable.* in selection path .*config.enable.* not found" "$@" ./disable-enable-modules.nix
# Check _module.args.
set -- config.enable ./declare-enable.nix ./define-enable-with-custom-arg.nix
checkConfigError 'while evaluating the module argument .*custom.* in .*define-enable-with-custom-arg.nix.*:' "$@"
checkConfigOutput "true" "$@" ./define-_module-args-custom.nix
# Check that using _module.args on imports cause infinite recursions, with
# the proper error context.
set -- "$@" ./define-_module-args-custom.nix ./import-custom-arg.nix
checkConfigError 'while evaluating the module argument .*custom.* in .*import-custom-arg.nix.*:' "$@"
checkConfigError 'infinite recursion encountered' "$@"
# Check _module.check.
set -- config.enable ./declare-enable.nix ./define-enable.nix ./define-attrsOfSub-foo.nix
checkConfigError 'The option .* does not exist. Definition values:\n- In .*' "$@"
checkConfigOutput "true" "$@" ./define-module-check.nix
# Check coerced value.
checkConfigOutput "\"42\"" config.value ./declare-coerced-value.nix
checkConfigOutput "\"24\"" config.value ./declare-coerced-value.nix ./define-value-string.nix
checkConfigError 'A definition for option .* is not.*string or signed integer convertible to it.*. Definition values:\n- In .*: \[ \]' config.value ./declare-coerced-value.nix ./define-value-list.nix
# Check coerced value with unsound coercion
checkConfigOutput "12" config.value ./declare-coerced-value-unsound.nix
checkConfigError 'A definition for option .* is not of type .*. Definition values:\n- In .*: "1000"' config.value ./declare-coerced-value-unsound.nix ./define-value-string-bigint.nix
checkConfigError 'unrecognised JSON value' config.value ./declare-coerced-value-unsound.nix ./define-value-string-arbitrary.nix
# Check mkAliasOptionModule.
checkConfigOutput "true" config.enable ./alias-with-priority.nix
checkConfigOutput "true" config.enableAlias ./alias-with-priority.nix
checkConfigOutput "false" config.enable ./alias-with-priority-can-override.nix
checkConfigOutput "false" config.enableAlias ./alias-with-priority-can-override.nix
# submoduleWith
## specialArgs should work
checkConfigOutput "foo" config.submodule.foo ./declare-submoduleWith-special.nix
## shorthandOnlyDefines config behaves as expected
checkConfigOutput "true" config.submodule.config ./declare-submoduleWith-shorthand.nix ./define-submoduleWith-shorthand.nix
checkConfigError 'is not of type `boolean' config.submodule.config ./declare-submoduleWith-shorthand.nix ./define-submoduleWith-noshorthand.nix
checkConfigError "You're trying to declare a value of type \`bool'\nrather than an attribute-set for the option" config.submodule.config ./declare-submoduleWith-noshorthand.nix ./define-submoduleWith-shorthand.nix
checkConfigOutput "true" config.submodule.config ./declare-submoduleWith-noshorthand.nix ./define-submoduleWith-noshorthand.nix
## submoduleWith should merge all modules in one swoop
checkConfigOutput "true" config.submodule.inner ./declare-submoduleWith-modules.nix
checkConfigOutput "true" config.submodule.outer ./declare-submoduleWith-modules.nix
## Paths should be allowed as values and work as expected
checkConfigOutput "true" config.submodule.enable ./declare-submoduleWith-path.nix
# Check that disabledModules works recursively and correctly
checkConfigOutput "true" config.enable ./disable-recursive/main.nix
checkConfigOutput "true" config.enable ./disable-recursive/{main.nix,disable-foo.nix}
checkConfigOutput "true" config.enable ./disable-recursive/{main.nix,disable-bar.nix}
checkConfigError 'The option .* does not exist. Definition values:\n- In .*: true' config.enable ./disable-recursive/{main.nix,disable-foo.nix,disable-bar.nix}
# Check that imports can depend on derivations
checkConfigOutput "true" config.enable ./import-from-store.nix
# Check that configs can be conditional on option existence
checkConfigOutput true config.enable ./define-option-dependently.nix ./declare-enable.nix ./declare-int-positive-value.nix
checkConfigOutput 360 config.value ./define-option-dependently.nix ./declare-enable.nix ./declare-int-positive-value.nix
checkConfigOutput 7 config.value ./define-option-dependently.nix ./declare-int-positive-value.nix
checkConfigOutput true config.set.enable ./define-option-dependently-nested.nix ./declare-enable-nested.nix ./declare-int-positive-value-nested.nix
checkConfigOutput 360 config.set.value ./define-option-dependently-nested.nix ./declare-enable-nested.nix ./declare-int-positive-value-nested.nix
checkConfigOutput 7 config.set.value ./define-option-dependently-nested.nix ./declare-int-positive-value-nested.nix
# Check attrsOf and lazyAttrsOf. Only lazyAttrsOf should be lazy, and only
# attrsOf should work with conditional definitions
# In addition, lazyAttrsOf should honor an options emptyValue
checkConfigError "is not lazy" config.isLazy ./declare-attrsOf.nix ./attrsOf-lazy-check.nix
checkConfigOutput "true" config.isLazy ./declare-lazyAttrsOf.nix ./attrsOf-lazy-check.nix
checkConfigOutput "true" config.conditionalWorks ./declare-attrsOf.nix ./attrsOf-conditional-check.nix
checkConfigOutput "false" config.conditionalWorks ./declare-lazyAttrsOf.nix ./attrsOf-conditional-check.nix
checkConfigOutput "empty" config.value.foo ./declare-lazyAttrsOf.nix ./attrsOf-conditional-check.nix
# Even with multiple assignments, a type error should be thrown if any of them aren't valid
checkConfigError 'A definition for option .* is not of type .*' \
config.value ./declare-int-unsigned-value.nix ./define-value-list.nix ./define-value-int-positive.nix
## Freeform modules
# Assigning without a declared option should work
checkConfigOutput 24 config.value ./freeform-attrsOf.nix ./define-value-string.nix
# No freeform assigments shouldn't make it error
checkConfigOutput '{ }' config ./freeform-attrsOf.nix
# but only if the type matches
checkConfigError 'A definition for option .* is not of type .*' config.value ./freeform-attrsOf.nix ./define-value-list.nix
# and properties should be applied
checkConfigOutput yes config.value ./freeform-attrsOf.nix ./define-value-string-properties.nix
# Options should still be declarable, and be able to have a type that doesn't match the freeform type
checkConfigOutput false config.enable ./freeform-attrsOf.nix ./define-value-string.nix ./declare-enable.nix
checkConfigOutput 24 config.value ./freeform-attrsOf.nix ./define-value-string.nix ./declare-enable.nix
# and this should work too with nested values
checkConfigOutput false config.nest.foo ./freeform-attrsOf.nix ./freeform-nested.nix
checkConfigOutput bar config.nest.bar ./freeform-attrsOf.nix ./freeform-nested.nix
# Check whether a declared option can depend on an freeform-typed one
checkConfigOutput null config.foo ./freeform-attrsOf.nix ./freeform-str-dep-unstr.nix
checkConfigOutput 24 config.foo ./freeform-attrsOf.nix ./freeform-str-dep-unstr.nix ./define-value-string.nix
# Check whether an freeform-typed value can depend on a declared option, this can only work with lazyAttrsOf
checkConfigError 'infinite recursion encountered' config.foo ./freeform-attrsOf.nix ./freeform-unstr-dep-str.nix
checkConfigError 'The option .* is used but not defined' config.foo ./freeform-lazyAttrsOf.nix ./freeform-unstr-dep-str.nix
checkConfigOutput 24 config.foo ./freeform-lazyAttrsOf.nix ./freeform-unstr-dep-str.nix ./define-value-string.nix
## types.anything
# Check that attribute sets are merged recursively
checkConfigOutput null config.value.foo ./types-anything/nested-attrs.nix
checkConfigOutput null config.value.l1.foo ./types-anything/nested-attrs.nix
checkConfigOutput null config.value.l1.l2.foo ./types-anything/nested-attrs.nix
checkConfigOutput null config.value.l1.l2.l3.foo ./types-anything/nested-attrs.nix
# Attribute sets that are coercible to strings shouldn't be recursed into
checkConfigOutput foo config.value.outPath ./types-anything/attrs-coercible.nix
# Multiple lists aren't concatenated together
checkConfigError 'The option .* has conflicting definitions' config.value ./types-anything/lists.nix
# Check that all equalizable atoms can be used as long as all definitions are equal
checkConfigOutput 0 config.value.int ./types-anything/equal-atoms.nix
checkConfigOutput false config.value.bool ./types-anything/equal-atoms.nix
checkConfigOutput '""' config.value.string ./types-anything/equal-atoms.nix
checkConfigOutput / config.value.path ./types-anything/equal-atoms.nix
checkConfigOutput null config.value.null ./types-anything/equal-atoms.nix
checkConfigOutput 0.1 config.value.float ./types-anything/equal-atoms.nix
# Functions can't be merged together
checkConfigError "The option .* has conflicting definition values" config.value.multiple-lambdas ./types-anything/functions.nix
checkConfigOutput '<LAMBDA>' config.value.single-lambda ./types-anything/functions.nix
# Check that all mk* modifiers are applied
checkConfigError 'attribute .* not found' config.value.mkiffalse ./types-anything/mk-mods.nix
checkConfigOutput '{ }' config.value.mkiftrue ./types-anything/mk-mods.nix
checkConfigOutput 1 config.value.mkdefault ./types-anything/mk-mods.nix
checkConfigOutput '{ }' config.value.mkmerge ./types-anything/mk-mods.nix
checkConfigOutput true config.value.mkbefore ./types-anything/mk-mods.nix
checkConfigOutput 1 config.value.nested.foo ./types-anything/mk-mods.nix
checkConfigOutput baz config.value.nested.bar.baz ./types-anything/mk-mods.nix
## types.functionTo
checkConfigOutput "input is input" config.result ./functionTo/trivial.nix
checkConfigOutput "a b" config.result ./functionTo/merging-list.nix
checkConfigError 'A definition for option .fun.\[function body\]. is not of type .string.. Definition values:\n- In .*wrong-type.nix' config.result ./functionTo/wrong-type.nix
checkConfigOutput "b a" config.result ./functionTo/list-order.nix
checkConfigOutput "a c" config.result ./functionTo/merging-attrs.nix
cat <<EOF
====== module tests ======
$pass Pass
$fail Fail
EOF
if test $fail -ne 0; then
exit 1
fi
exit 0