Support special attributes in structured attributes derivations
E.g. __noChroot and allowedReferences now work correctly. We also now check that the attribute type is correct. For instance, instead of allowedReferences = "out"; you have to write allowedReferences = [ "out" ]; Fixes #2453.
This commit is contained in:
Eelco Dolstra
parent
63786cbd3b
commit
c9ba33870e
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@ -740,6 +740,9 @@ private:
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/* The derivation stored at drvPath. */
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std::unique_ptr<BasicDerivation> drv;
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/* The contents of drv->env["__json"]. */
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std::experimental::optional<nlohmann::json> structuredAttrs;
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/* The remainder is state held during the build. */
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/* Locks on the output paths. */
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@ -920,6 +923,13 @@ private:
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/* Fill in the environment for the builder. */
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void initEnv();
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/* Get an attribute from drv->env or from drv->env["__json"]. */
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std::experimental::optional<std::string> getAttr(const std::string & name);
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bool getBoolAttr(const std::string & name, bool def = false);
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std::experimental::optional<Strings> getStringsAttr(const std::string & name);
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/* Write a JSON file containing the derivation attributes. */
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void writeStructuredAttrs();
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@ -1139,6 +1149,16 @@ void DerivationGoal::haveDerivation()
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return;
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}
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/* Parse the __json attribute, if any. */
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auto jsonAttr = drv->env.find("__json");
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if (jsonAttr != drv->env.end()) {
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try {
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structuredAttrs = nlohmann::json::parse(jsonAttr->second);
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} catch (std::exception & e) {
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throw Error("cannot process __json attribute of '%s': %s", drvPath, e.what());
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}
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}
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/* We are first going to try to create the invalid output paths
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through substitutes. If that doesn't work, we'll build
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them. */
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@ -1644,7 +1664,7 @@ HookReply DerivationGoal::tryBuildHook()
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/* Tell the hook about system features (beyond the system type)
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required from the build machine. (The hook could parse the
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drv file itself, but this is easier.) */
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Strings features = tokenizeString<Strings>(get(drv->env, "requiredSystemFeatures"));
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auto features = getStringsAttr("requiredSystemFeatures").value_or(Strings());
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for (auto & i : features) checkStoreName(i); /* !!! abuse */
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/* Send the request to the hook. */
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@ -1803,13 +1823,14 @@ void DerivationGoal::startBuilder()
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preloadNSS();
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#if __APPLE__
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additionalSandboxProfile = get(drv->env, "__sandboxProfile");
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additionalSandboxProfile = getAttr("__sandboxProfile").value_or("");
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#endif
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/* Are we doing a chroot build? */
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{
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auto noChroot = getBoolAttr("__noChroot");
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if (settings.sandboxMode == smEnabled) {
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if (get(drv->env, "__noChroot") == "1")
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if (noChroot)
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throw Error(format("derivation '%1%' has '__noChroot' set, "
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"but that's not allowed when 'sandbox' is 'true'") % drvPath);
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#if __APPLE__
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@ -1822,7 +1843,7 @@ void DerivationGoal::startBuilder()
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else if (settings.sandboxMode == smDisabled)
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useChroot = false;
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else if (settings.sandboxMode == smRelaxed)
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useChroot = !fixedOutput && get(drv->env, "__noChroot") != "1";
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useChroot = !fixedOutput && !noChroot;
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}
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if (worker.store.storeDir != worker.store.realStoreDir) {
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@ -1873,7 +1894,7 @@ void DerivationGoal::startBuilder()
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writeStructuredAttrs();
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/* Handle exportReferencesGraph(), if set. */
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if (!drv->env.count("__json")) {
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if (!structuredAttrs) {
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/* The `exportReferencesGraph' feature allows the references graph
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to be passed to a builder. This attribute should be a list of
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pairs [name1 path1 name2 path2 ...]. The references graph of
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@ -1938,7 +1959,7 @@ void DerivationGoal::startBuilder()
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PathSet allowedPaths = settings.allowedImpureHostPrefixes;
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/* This works like the above, except on a per-derivation level */
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Strings impurePaths = tokenizeString<Strings>(get(drv->env, "__impureHostDeps"));
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auto impurePaths = getStringsAttr("__impureHostDeps").value_or(Strings());
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for (auto & i : impurePaths) {
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bool found = false;
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@ -2306,7 +2327,7 @@ void DerivationGoal::initEnv()
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passAsFile is ignored in structure mode because it's not
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needed (attributes are not passed through the environment, so
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there is no size constraint). */
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if (!drv->env.count("__json")) {
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if (!structuredAttrs) {
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StringSet passAsFile = tokenizeString<StringSet>(get(drv->env, "passAsFile"));
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int fileNr = 0;
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@ -2353,8 +2374,8 @@ void DerivationGoal::initEnv()
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fixed-output derivations is by definition pure (since we
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already know the cryptographic hash of the output). */
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if (fixedOutput) {
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Strings varNames = tokenizeString<Strings>(get(drv->env, "impureEnvVars"));
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for (auto & i : varNames) env[i] = getEnv(i);
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for (auto & i : getStringsAttr("impureEnvVars").value_or(Strings()))
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env[i] = getEnv(i);
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}
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/* Currently structured log messages piggyback on stderr, but we
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@ -2364,116 +2385,176 @@ void DerivationGoal::initEnv()
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}
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std::experimental::optional<std::string> DerivationGoal::getAttr(const std::string & name)
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{
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if (structuredAttrs) {
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auto i = structuredAttrs->find(name);
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if (i == structuredAttrs->end())
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return {};
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else {
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if (!i->is_string())
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throw Error("attribute '%s' of derivation '%s' must be a string", name, drvPath);
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return i->get<std::string>();
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}
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} else {
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auto i = drv->env.find(name);
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if (i == drv->env.end())
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return {};
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else
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return i->second;
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}
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}
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bool DerivationGoal::getBoolAttr(const std::string & name, bool def)
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{
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if (structuredAttrs) {
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auto i = structuredAttrs->find(name);
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if (i == structuredAttrs->end())
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return def;
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else {
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if (!i->is_boolean())
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throw Error("attribute '%s' of derivation '%s' must be a Boolean", name, drvPath);
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return i->get<bool>();
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}
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} else {
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auto i = drv->env.find(name);
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if (i == drv->env.end())
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return def;
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else
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return i->second == "1";
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}
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}
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std::experimental::optional<Strings> DerivationGoal::getStringsAttr(const std::string & name)
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{
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if (structuredAttrs) {
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auto i = structuredAttrs->find(name);
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if (i == structuredAttrs->end())
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return {};
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else {
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if (!i->is_array())
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throw Error("attribute '%s' of derivation '%s' must be a list of strings", name, drvPath);
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Strings res;
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for (auto j = i->begin(); j != i->end(); ++j) {
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if (!j->is_string())
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throw Error("attribute '%s' of derivation '%s' must be a list of strings", name, drvPath);
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res.push_back(j->get<std::string>());
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}
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return res;
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}
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} else {
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auto i = drv->env.find(name);
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if (i == drv->env.end())
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return {};
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else
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return tokenizeString<Strings>(i->second);
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}
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}
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static std::regex shVarName("[A-Za-z_][A-Za-z0-9_]*");
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void DerivationGoal::writeStructuredAttrs()
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{
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auto jsonAttr = drv->env.find("__json");
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if (jsonAttr == drv->env.end()) return;
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if (!structuredAttrs) return;
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try {
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auto json = *structuredAttrs;
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auto jsonStr = rewriteStrings(jsonAttr->second, inputRewrites);
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/* Add an "outputs" object containing the output paths. */
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nlohmann::json outputs;
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for (auto & i : drv->outputs)
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outputs[i.first] = rewriteStrings(i.second.path, inputRewrites);
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json["outputs"] = outputs;
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auto json = nlohmann::json::parse(jsonStr);
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/* Add an "outputs" object containing the output paths. */
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nlohmann::json outputs;
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for (auto & i : drv->outputs)
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outputs[i.first] = rewriteStrings(i.second.path, inputRewrites);
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json["outputs"] = outputs;
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/* Handle exportReferencesGraph. */
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auto e = json.find("exportReferencesGraph");
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if (e != json.end() && e->is_object()) {
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for (auto i = e->begin(); i != e->end(); ++i) {
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std::ostringstream str;
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{
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JSONPlaceholder jsonRoot(str, true);
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PathSet storePaths;
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for (auto & p : *i)
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storePaths.insert(p.get<std::string>());
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worker.store.pathInfoToJSON(jsonRoot,
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exportReferences(storePaths), false, true);
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}
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json[i.key()] = nlohmann::json::parse(str.str()); // urgh
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/* Handle exportReferencesGraph. */
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auto e = json.find("exportReferencesGraph");
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if (e != json.end() && e->is_object()) {
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for (auto i = e->begin(); i != e->end(); ++i) {
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std::ostringstream str;
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{
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JSONPlaceholder jsonRoot(str, true);
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PathSet storePaths;
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for (auto & p : *i)
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storePaths.insert(p.get<std::string>());
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worker.store.pathInfoToJSON(jsonRoot,
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exportReferences(storePaths), false, true);
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}
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json[i.key()] = nlohmann::json::parse(str.str()); // urgh
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}
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writeFile(tmpDir + "/.attrs.json", json.dump());
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/* As a convenience to bash scripts, write a shell file that
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maps all attributes that are representable in bash -
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namely, strings, integers, nulls, Booleans, and arrays and
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objects consisting entirely of those values. (So nested
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arrays or objects are not supported.) */
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auto handleSimpleType = [](const nlohmann::json & value) -> std::experimental::optional<std::string> {
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if (value.is_string())
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return shellEscape(value);
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if (value.is_number()) {
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auto f = value.get<float>();
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if (std::ceil(f) == f)
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return std::to_string(value.get<int>());
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}
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if (value.is_null())
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return std::string("''");
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if (value.is_boolean())
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return value.get<bool>() ? std::string("1") : std::string("");
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return {};
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};
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std::string jsonSh;
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for (auto i = json.begin(); i != json.end(); ++i) {
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if (!std::regex_match(i.key(), shVarName)) continue;
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auto & value = i.value();
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auto s = handleSimpleType(value);
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if (s)
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jsonSh += fmt("declare %s=%s\n", i.key(), *s);
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else if (value.is_array()) {
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std::string s2;
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bool good = true;
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for (auto i = value.begin(); i != value.end(); ++i) {
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auto s3 = handleSimpleType(i.value());
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if (!s3) { good = false; break; }
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s2 += *s3; s2 += ' ';
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}
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if (good)
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jsonSh += fmt("declare -a %s=(%s)\n", i.key(), s2);
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}
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else if (value.is_object()) {
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std::string s2;
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bool good = true;
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for (auto i = value.begin(); i != value.end(); ++i) {
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auto s3 = handleSimpleType(i.value());
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if (!s3) { good = false; break; }
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s2 += fmt("[%s]=%s ", shellEscape(i.key()), *s3);
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}
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if (good)
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jsonSh += fmt("declare -A %s=(%s)\n", i.key(), s2);
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}
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}
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writeFile(tmpDir + "/.attrs.sh", jsonSh);
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} catch (std::exception & e) {
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throw Error("cannot process __json attribute of '%s': %s", drvPath, e.what());
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}
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writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
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/* As a convenience to bash scripts, write a shell file that
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maps all attributes that are representable in bash -
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namely, strings, integers, nulls, Booleans, and arrays and
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objects consisting entirely of those values. (So nested
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arrays or objects are not supported.) */
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auto handleSimpleType = [](const nlohmann::json & value) -> std::experimental::optional<std::string> {
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if (value.is_string())
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return shellEscape(value);
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if (value.is_number()) {
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auto f = value.get<float>();
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if (std::ceil(f) == f)
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return std::to_string(value.get<int>());
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}
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if (value.is_null())
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return std::string("''");
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if (value.is_boolean())
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return value.get<bool>() ? std::string("1") : std::string("");
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return {};
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};
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std::string jsonSh;
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for (auto i = json.begin(); i != json.end(); ++i) {
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if (!std::regex_match(i.key(), shVarName)) continue;
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auto & value = i.value();
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auto s = handleSimpleType(value);
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if (s)
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jsonSh += fmt("declare %s=%s\n", i.key(), *s);
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else if (value.is_array()) {
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std::string s2;
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bool good = true;
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for (auto i = value.begin(); i != value.end(); ++i) {
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auto s3 = handleSimpleType(i.value());
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if (!s3) { good = false; break; }
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s2 += *s3; s2 += ' ';
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}
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if (good)
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jsonSh += fmt("declare -a %s=(%s)\n", i.key(), s2);
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}
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else if (value.is_object()) {
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std::string s2;
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bool good = true;
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for (auto i = value.begin(); i != value.end(); ++i) {
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auto s3 = handleSimpleType(i.value());
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if (!s3) { good = false; break; }
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s2 += fmt("[%s]=%s ", shellEscape(i.key()), *s3);
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}
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if (good)
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jsonSh += fmt("declare -A %s=(%s)\n", i.key(), s2);
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}
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}
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writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
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}
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@ -2917,7 +2998,7 @@ void DerivationGoal::runChild()
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writeFile(sandboxFile, sandboxProfile);
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bool allowLocalNetworking = get(drv->env, "__darwinAllowLocalNetworking") == "1";
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bool allowLocalNetworking = getBoolAttr("__darwinAllowLocalNetworking");
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/* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms
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to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */
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@ -2989,10 +3070,9 @@ void DerivationGoal::runChild()
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/* Parse a list of reference specifiers. Each element must either be
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a store path, or the symbolic name of the output of the derivation
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(such as `out'). */
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PathSet parseReferenceSpecifiers(Store & store, const BasicDerivation & drv, string attr)
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PathSet parseReferenceSpecifiers(Store & store, const BasicDerivation & drv, const Strings & paths)
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{
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PathSet result;
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Paths paths = tokenizeString<Paths>(attr);
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for (auto & i : paths) {
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if (store.isStorePath(i))
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result.insert(i);
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@ -3121,7 +3201,7 @@ void DerivationGoal::registerOutputs()
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the derivation to its content-addressed location. */
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Hash h2 = recursive ? hashPath(h.type, actualPath).first : hashFile(h.type, actualPath);
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Path dest = worker.store.makeFixedOutputPath(recursive, h2, drv->env["name"]);
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Path dest = worker.store.makeFixedOutputPath(recursive, h2, storePathToName(path));
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if (h != h2) {
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@ -3204,9 +3284,10 @@ void DerivationGoal::registerOutputs()
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/* Enforce `allowedReferences' and friends. */
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auto checkRefs = [&](const string & attrName, bool allowed, bool recursive) {
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if (drv->env.find(attrName) == drv->env.end()) return;
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auto value = getStringsAttr(attrName);
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if (!value) return;
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PathSet spec = parseReferenceSpecifiers(worker.store, *drv, get(drv->env, attrName));
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PathSet spec = parseReferenceSpecifiers(worker.store, *drv, *value);
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PathSet used;
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if (recursive) {
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