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https://github.com/NixOS/nix
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fix NIX_PATH for real (#11079)
* fix NIX_PATH overriding - test restricted evaluation - test precedence for setting the search path Co-authored-by: Robert Hensing <robert@roberthensing.nl> Co-authored-by: John Ericson <git@JohnEricson.me>
This commit is contained in:
Valentin Gagarin
GitHub
parent
874c1bdbbf
commit
e062021314
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@ -1,5 +1,7 @@
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#include "error.hh"
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#include "environment-variables.hh"
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#include "eval-settings.hh"
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#include "config-global.hh"
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#include "serialise.hh"
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#include "eval-gc.hh"
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@ -230,6 +232,12 @@ void initGC()
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gcCyclesAfterInit = GC_get_gc_no();
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#endif
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// NIX_PATH must override the regular setting
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// See the comment in applyConfig
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if (auto nixPathEnv = getEnv("NIX_PATH")) {
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globalConfig.set("nix-path", concatStringsSep(" ", EvalSettings::parseNixPath(nixPathEnv.value())));
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}
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gcInitialised = true;
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}
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@ -8,7 +8,7 @@ namespace nix {
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/* Very hacky way to parse $NIX_PATH, which is colon-separated, but
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can contain URLs (e.g. "nixpkgs=https://bla...:foo=https://"). */
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static Strings parseNixPath(const std::string & s)
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Strings EvalSettings::parseNixPath(const std::string & s)
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{
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Strings res;
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@ -48,10 +48,7 @@ EvalSettings::EvalSettings(bool & readOnlyMode, EvalSettings::LookupPathHooks lo
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: readOnlyMode{readOnlyMode}
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, lookupPathHooks{lookupPathHooks}
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{
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auto var = getEnv("NIX_PATH");
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if (var) nixPath = parseNixPath(*var);
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var = getEnv("NIX_ABORT_ON_WARN");
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auto var = getEnv("NIX_ABORT_ON_WARN");
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if (var && (var == "1" || var == "yes" || var == "true"))
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builtinsAbortOnWarn = true;
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}
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@ -47,6 +47,8 @@ struct EvalSettings : Config
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static bool isPseudoUrl(std::string_view s);
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static Strings parseNixPath(const std::string & s);
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static std::string resolvePseudoUrl(std::string_view url);
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LookupPathHooks lookupPathHooks;
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@ -71,7 +73,7 @@ struct EvalSettings : Config
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)"};
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Setting<Strings> nixPath{
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this, getDefaultNixPath(), "nix-path",
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this, {}, "nix-path",
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R"(
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List of search paths to use for [lookup path](@docroot@/language/constructs/lookup-path.md) resolution.
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This setting determines the value of
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@ -215,7 +215,7 @@ static Symbol getName(const AttrName & name, EvalState & state, Env & env)
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static constexpr size_t BASE_ENV_SIZE = 128;
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EvalState::EvalState(
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const LookupPath & _lookupPath,
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const LookupPath & lookupPathFromArguments,
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ref<Store> store,
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const fetchers::Settings & fetchSettings,
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const EvalSettings & settings,
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@ -331,12 +331,21 @@ EvalState::EvalState(
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vStringSymlink.mkString("symlink");
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vStringUnknown.mkString("unknown");
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/* Initialise the Nix expression search path. */
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/* Construct the Nix expression search path. */
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assert(lookupPath.elements.empty());
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if (!settings.pureEval) {
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for (auto & i : _lookupPath.elements)
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for (auto & i : lookupPathFromArguments.elements) {
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lookupPath.elements.emplace_back(LookupPath::Elem {i});
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for (auto & i : settings.nixPath.get())
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}
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/* $NIX_PATH overriding regular settings is implemented as a hack in `initGC()` */
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for (auto & i : settings.nixPath.get()) {
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lookupPath.elements.emplace_back(LookupPath::Elem::parse(i));
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}
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if (!settings.restrictEval) {
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for (auto & i : EvalSettings::getDefaultNixPath()) {
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lookupPath.elements.emplace_back(LookupPath::Elem::parse(i));
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}
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}
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}
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/* Allow access to all paths in the search path. */
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@ -1,6 +1,7 @@
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#include "config.hh"
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#include "args.hh"
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#include "abstract-setting-to-json.hh"
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#include "environment-variables.hh"
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#include "experimental-features.hh"
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#include "util.hh"
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#include "file-system.hh"
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@ -170,9 +171,18 @@ void AbstractConfig::applyConfig(const std::string & contents, const std::string
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set(name, value);
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// Then apply other settings
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for (const auto & [name, value] : parsedContents)
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if (name != "experimental-features" && name != "extra-experimental-features")
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// XXX: NIX_PATH must override the regular setting! This is done in `initGC()`
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// Environment variables overriding settings should probably be part of the Config mechanism,
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// but at the time of writing it's not worth building that for just one thing
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for (const auto & [name, value] : parsedContents) {
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if (name != "experimental-features" && name != "extra-experimental-features") {
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if ((name == "nix-path" || name == "extra-nix-path")
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&& getEnv("NIX_PATH").has_value()) {
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continue;
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}
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set(name, value);
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}
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}
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}
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void Config::resetOverridden()
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@ -14,3 +14,73 @@ nix-instantiate --eval -E '<by-relative-path/simple.nix>' --restrict-eval
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[[ $(nix-instantiate --find-file by-absolute-path/simple.nix) = $PWD/simple.nix ]]
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[[ $(nix-instantiate --find-file by-relative-path/simple.nix) = $PWD/simple.nix ]]
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# this is the human-readable specification for the following test cases of interactions between various ways of specifying NIX_PATH.
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# TODO: the actual tests are incomplete and too manual.
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# there should be 43 of them, since the table has 9 rows and columns, and 2 interactions are meaningless
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# ideally they would work off the table programmatically.
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#
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# | precedence | hard-coded | nix-path in file | extra-nix-path in file | nix-path in env | extra-nix-path in env | NIX_PATH | nix-path | extra-nix-path | -I |
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# |------------------------|------------|------------------|------------------------|-----------------|-----------------------|-----------|-----------|-----------------|-----------------|
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# | hard-coded | x | ^override | ^append | ^override | ^append | ^override | ^override | ^append | ^append |
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# | nix-path in file | | last wins | ^append | ^override | ^append | ^override | ^override | ^append | ^append |
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# | extra-nix-path in file | | | append in order | ^override | ^append | ^override | ^override | ^append | ^append |
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# | nix-path in env | | | | last wins | ^append | ^override | ^override | ^append | ^append |
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# | extra-nix-path in env | | | | | append in order | ^override | ^override | ^append | ^append |
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# | NIX_PATH | | | | | | x | ^override | ^append | ^append |
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# | nix-path | | | | | | | last wins | ^append | ^append |
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# | extra-nix-path | | | | | | | | append in order | append in order |
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# | -I | | | | | | | | | append in order |
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unset NIX_PATH
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mkdir -p $TEST_ROOT/{from-nix-path-file,from-NIX_PATH,from-nix-path,from-extra-nix-path,from-I}
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for i in from-nix-path-file from-NIX_PATH from-nix-path from-extra-nix-path from-I; do
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touch $TEST_ROOT/$i/only-$i.nix
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done
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# finding something that's not in any of the default paths fails
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( ! $(nix-instantiate --find-file test) )
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echo "nix-path = test=$TEST_ROOT/from-nix-path-file" >> "$test_nix_conf"
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# Use nix.conf in absence of NIX_PATH
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[[ $(nix-instantiate --find-file test) = $TEST_ROOT/from-nix-path-file ]]
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# NIX_PATH overrides nix.conf
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate --find-file test) = $TEST_ROOT/from-NIX_PATH ]]
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# if NIX_PATH does not have the desired entry, it fails
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(! NIX_PATH=test=$TEST_ROOT nix-instantiate --find-file test/only-from-nix-path-file.nix)
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# -I extends nix.conf
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[[ $(nix-instantiate -I test=$TEST_ROOT/from-I --find-file test/only-from-I.nix) = $TEST_ROOT/from-I/only-from-I.nix ]]
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# if -I does not have the desired entry, the value from nix.conf is used
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[[ $(nix-instantiate -I test=$TEST_ROOT/from-I --find-file test/only-from-nix-path-file.nix) = $TEST_ROOT/from-nix-path-file/only-from-nix-path-file.nix ]]
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# -I extends NIX_PATH
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate -I test=$TEST_ROOT/from-I --find-file test/only-from-I.nix) = $TEST_ROOT/from-I/only-from-I.nix ]]
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# if -I does not have the desired entry, the value from NIX_PATH is used
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate -I test=$TEST_ROOT/from-I --find-file test/only-from-NIX_PATH.nix) = $TEST_ROOT/from-NIX_PATH/only-from-NIX_PATH.nix ]]
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# --extra-nix-path extends NIX_PATH
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate --extra-nix-path test=$TEST_ROOT/from-extra-nix-path --find-file test/only-from-extra-nix-path.nix) = $TEST_ROOT/from-extra-nix-path/only-from-extra-nix-path.nix ]]
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# if --extra-nix-path does not have the desired entry, the value from NIX_PATH is used
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate --extra-nix-path test=$TEST_ROOT/from-extra-nix-path --find-file test/only-from-NIX_PATH.nix) = $TEST_ROOT/from-NIX_PATH/only-from-NIX_PATH.nix ]]
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# --nix-path overrides NIX_PATH
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[[ $(NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path --find-file test) = $TEST_ROOT/from-nix-path ]]
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# if --nix-path does not have the desired entry, it fails
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(! NIX_PATH=test=$TEST_ROOT/from-NIX_PATH nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path --find-file test/only-from-NIX_PATH.nix)
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# --nix-path overrides nix.conf
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[[ $(nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path --find-file test) = $TEST_ROOT/from-nix-path ]]
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(! nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path --find-file test/only-from-nix-path-file.nix)
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# --extra-nix-path extends nix.conf
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[[ $(nix-instantiate --extra-nix-path test=$TEST_ROOT/from-extra-nix-path --find-file test/only-from-extra-nix-path.nix) = $TEST_ROOT/from-extra-nix-path/only-from-extra-nix-path.nix ]]
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# if --extra-nix-path does not have the desired entry, it is taken from nix.conf
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[[ $(nix-instantiate --extra-nix-path test=$TEST_ROOT/from-extra-nix-path --find-file test) = $TEST_ROOT/from-nix-path-file ]]
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# -I extends --nix-path
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[[ $(nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path -I test=$TEST_ROOT/from-I --find-file test/only-from-I.nix) = $TEST_ROOT/from-I/only-from-I.nix ]]
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[[ $(nix-instantiate --nix-path test=$TEST_ROOT/from-nix-path -I test=$TEST_ROOT/from-I --find-file test/only-from-nix-path.nix) = $TEST_ROOT/from-nix-path/only-from-nix-path.nix ]]
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@ -10,6 +10,9 @@ nix-instantiate --restrict-eval --eval -E '1 + 2'
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nix-instantiate --restrict-eval ./simple.nix -I src=.
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nix-instantiate --restrict-eval ./simple.nix -I src1=simple.nix -I src2=config.nix -I src3=./simple.builder.sh
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# no default NIX_PATH
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(unset NIX_PATH; ! nix-instantiate --restrict-eval --find-file .)
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(! nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix')
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nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix' -I src=../..
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