forked from lix-project/lix
117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
#include "parsed-derivations.hh"
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namespace nix {
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ParsedDerivation::ParsedDerivation(const Path & drvPath, BasicDerivation & drv)
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: drvPath(drvPath), drv(drv)
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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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}
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std::optional<std::string> ParsedDerivation::getStringAttr(const std::string & name) const
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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 ParsedDerivation::getBoolAttr(const std::string & name, bool def) const
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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::optional<Strings> ParsedDerivation::getStringsAttr(const std::string & name) const
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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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StringSet ParsedDerivation::getRequiredSystemFeatures() const
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{
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StringSet res;
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for (auto & i : getStringsAttr("requiredSystemFeatures").value_or(Strings()))
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res.insert(i);
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return res;
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}
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bool ParsedDerivation::canBuildLocally() const
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{
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if (drv.platform != settings.thisSystem.get()
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&& !settings.extraPlatforms.get().count(drv.platform)
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&& !drv.isBuiltin())
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return false;
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for (auto & feature : getRequiredSystemFeatures())
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if (!settings.systemFeatures.get().count(feature)) return false;
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return true;
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}
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bool ParsedDerivation::willBuildLocally() const
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{
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return getBoolAttr("preferLocalBuild") && canBuildLocally();
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}
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bool ParsedDerivation::substitutesAllowed() const
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{
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return getBoolAttr("allowSubstitutes", true);
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}
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}
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