forked from lix-project/lix
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
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#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::experimental::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::experimental::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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bool ParsedDerivation::canBuildLocally() const
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{
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return drv.platform == settings.thisSystem
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|| settings.extraPlatforms.get().count(drv.platform) > 0
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|| drv.isBuiltin();
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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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}
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