Checkpoint

src/libexpr/paths.cc

@@ -0,0 +1,39 @@
+#include "eval.hh"
+#include "util.hh"
+
+namespace nix {
+
+static constexpr std::string_view marker = "/__virtual/";
+
+Path EvalState::packPath(const SourcePath & path)
+{
+    printError("PACK %s", path.path);
+    assert(hasPrefix(path.path, "/"));
+    inputAccessors.emplace(path.accessor->number, path.accessor);
+    return std::string(marker) + std::to_string(path.accessor->number) + path.path;
+}
+
+SourcePath EvalState::unpackPath(const Path & path)
+{
+    if (hasPrefix(path, marker)) {
+        auto s = path.substr(marker.size());
+        auto slash = s.find('/');
+        assert(slash != s.npos);
+        auto n = std::stoi(s.substr(0, slash));
+        printError("GOT %d", n);
+        auto i = inputAccessors.find(n);
+        assert(i != inputAccessors.end());
+        return {i->second, s.substr(slash)};
+    } else {
+        printError("FIXME: %s", path);
+        return rootPath(path);
+    }
+}
+
+SourcePath EvalState::rootPath(const Path & path)
+{
+    printError("ROOT %s", path);
+    return {rootFS, path};
+}
+
+}