1 files changed, 93 insertions, 0 deletions
diff --git a/src/libexpr/get-drvs.hh b/src/libexpr/get-drvs.hh
new file mode 100644
index 000000000000..aaafff1905e7
--- /dev/null
+++ b/src/libexpr/get-drvs.hh
@@ -0,0 +1,93 @@
+#pragma once
+
+#include "eval.hh"
+
+#include <string>
+#include <map>
+
+#include <boost/shared_ptr.hpp>
+
+
+namespace nix {
+
+
+struct DrvInfo
+{
+public:
+    typedef std::map<string, Path> Outputs;
+
+private:
+    EvalState * state;
+
+    string drvPath;
+    string outPath;
+    string outputName;
+    Outputs outputs;
+
+    bool failed; // set if we get an AssertionError
+
+    Bindings * attrs, * meta;
+
+    Bindings * getMeta();
+
+    bool checkMeta(Value & v);
+
+public:
+    string name;
+    string attrPath; /* path towards the derivation */
+    string system;
+
+    DrvInfo(EvalState & state) : state(&state), failed(false), attrs(0), meta(0) { };
+    DrvInfo(EvalState & state, const string & name, const string & attrPath, const string & system, Bindings * attrs)
+        : state(&state), failed(false), attrs(attrs), meta(0), name(name), attrPath(attrPath), system(system) { };
+
+    string queryDrvPath();
+    string queryOutPath();
+    string queryOutputName();
+    Outputs queryOutputs();
+
+    StringSet queryMetaNames();
+    Value * queryMeta(const string & name);
+    string queryMetaString(const string & name);
+    int queryMetaInt(const string & name, int def);
+    bool queryMetaBool(const string & name, bool def);
+    void setMeta(const string & name, Value * v);
+
+    /*
+    MetaInfo queryMetaInfo(EvalState & state) const;
+    MetaValue queryMetaInfo(EvalState & state, const string & name) const;
+    */
+
+    void setDrvPath(const string & s)
+    {
+        drvPath = s;
+    }
+
+    void setOutPath(const string & s)
+    {
+        outPath = s;
+    }
+
+    void setFailed() { failed = true; };
+    bool hasFailed() { return failed; };
+};
+
+
+#if HAVE_BOEHMGC
+typedef list<DrvInfo, traceable_allocator<DrvInfo> > DrvInfos;
+#else
+typedef list<DrvInfo> DrvInfos;
+#endif
+
+
+/* If value `v' denotes a derivation, store information about the
+   derivation in `drv' and return true.  Otherwise, return false. */
+bool getDerivation(EvalState & state, Value & v, DrvInfo & drv,
+    bool ignoreAssertionFailures);
+
+void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
+    Bindings & autoArgs, DrvInfos & drvs,
+    bool ignoreAssertionFailures);
+
+
+}