1 files changed, 83 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/get-drvs.hh b/third_party/nix/src/libexpr/get-drvs.hh
new file mode 100644
index 0000000000..3de266d0c0
--- /dev/null
+++ b/third_party/nix/src/libexpr/get-drvs.hh
@@ -0,0 +1,83 @@
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "libexpr/eval.hh"
+
+namespace nix {
+
+struct DrvInfo {
+ public:
+  typedef std::map<std::string, Path> Outputs;
+
+ private:
+  EvalState* state;
+
+  mutable std::string name;
+  mutable std::string system;
+  mutable std::string drvPath;
+  mutable std::string outPath;
+  mutable std::string outputName;
+  Outputs outputs;
+
+  bool failed = false;  // set if we get an AssertionError
+
+  std::shared_ptr<Bindings> attrs = nullptr;
+  std::shared_ptr<Bindings> meta = nullptr;
+
+  Bindings* getMeta();
+
+  bool checkMeta(Value& v);
+
+ public:
+  std::string attrPath; /* path towards the derivation */
+
+  DrvInfo(EvalState& state) : state(&state){};
+  DrvInfo(EvalState& state, std::string attrPath,
+          std::shared_ptr<Bindings> attrs);
+  DrvInfo(EvalState& state, const ref<Store>& store,
+          const std::string& drvPathWithOutputs);
+
+  std::string queryName() const;
+  std::string querySystem() const;
+  std::string queryDrvPath() const;
+  std::string queryOutPath() const;
+  std::string queryOutputName() const;
+  /** Return the list of outputs. The "outputs to install" are determined by
+   * `meta.outputsToInstall`. */
+  Outputs queryOutputs(bool onlyOutputsToInstall = false);
+
+  StringSet queryMetaNames();
+  Value* queryMeta(const std::string& name);
+  std::string queryMetaString(const std::string& name);
+  NixInt queryMetaInt(const std::string& name, NixInt def);
+  NixFloat queryMetaFloat(const std::string& name, NixFloat def);
+  bool queryMetaBool(const std::string& name, bool def);
+  void setMeta(const std::string& name, Value* v);
+
+  /*
+  MetaInfo queryMetaInfo(EvalState & state) const;
+  MetaValue queryMetaInfo(EvalState & state, const std::string & name) const;
+  */
+
+  void setName(const std::string& s) { name = s; }
+  void setDrvPath(const std::string& s) { drvPath = s; }
+  void setOutPath(const std::string& s) { outPath = s; }
+
+  void setFailed() { failed = true; };
+  bool hasFailed() { return failed; };
+};
+
+using DrvInfos = std::list<DrvInfo>;
+
+/* If value `v' denotes a derivation, return a DrvInfo object
+   describing it. Otherwise return nothing. */
+std::optional<DrvInfo> getDerivation(EvalState& state, Value& v,
+                                     bool ignoreAssertionFailures);
+
+void getDerivations(EvalState& state, Value& v, const std::string& pathPrefix,
+                    Bindings* autoArgs, DrvInfos& drvs,
+                    bool ignoreAssertionFailures);
+
+}  // namespace nix