feat(3p/nix): remove builtins.importNative r/1424

This is the shared object equivalent of builtins.exec, or a plugins
equivalent accessible from the Nix language.  Either way, since we
don't have builtins.exec or plugins any more, I think it makes sense
to remove this builtin.

This will also allow us to drop the
allow-unsafe-native-code-during-evaluation option, which formerly
controlled whether builtins.exec and builtins.importNative were
enabled.

Cc: Griffin Smith <grfn@gws.fyi>
Cc: Profpatsch <mail@profpatsch.de>
Change-Id: I8993a8a79d559c102647308a2684c089bbc06713
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1340
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

2 files changed, 0 insertions, 55 deletions

diff --git a/third_party/nix/src/libexpr/primops.cc b/third_party/nix/src/libexpr/primops.cc
index 107cacb963..06b9788bdf 100644
--- a/third_party/nix/src/libexpr/primops.cc
+++ b/third_party/nix/src/libexpr/primops.cc
@@ -5,7 +5,6 @@
 #include <regex>
 
 #include <absl/strings/str_split.h>
-#include <dlfcn.h>
 #include <glog/logging.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -162,52 +161,6 @@ static void prim_scopedImport(EvalState& state, const Pos& pos, Value** args,
   }
 }
 
-/* Want reasonable symbol names, so extern C */
-/* !!! Should we pass the Pos or the file name too? */
-extern "C" using ValueInitializer = void(*)(EvalState&, Value&);
-
-/* Load a ValueInitializer from a DSO and return whatever it initializes */
-void prim_importNative(EvalState& state, const Pos& pos, Value** args,
-                       Value& v) {
-  PathSet context;
-  Path path = state.coerceToPath(pos, *args[0], context);
-
-  try {
-    state.realiseContext(context);
-  } catch (InvalidPathError& e) {
-    throw EvalError(
-        format("cannot import '%1%', since path '%2%' is not valid, at %3%") %
-        path % e.path % pos);
-  }
-
-  path = state.checkSourcePath(path);
-
-  std::string sym = state.forceStringNoCtx(*args[1], pos);
-
-  void* handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
-  if (handle == nullptr) {
-    throw EvalError(format("could not open '%1%': %2%") % path % dlerror());
-  }
-
-  dlerror();
-  auto func = (ValueInitializer)dlsym(handle, sym.c_str());
-  if (func == nullptr) {
-    char* message = dlerror();
-    if (message != nullptr) {
-      throw EvalError(format("could not load symbol '%1%' from '%2%': %3%") %
-                      sym % path % message);
-    }
-    throw EvalError(format("symbol '%1%' from '%2%' resolved to NULL when a "
-                           "function pointer was expected") %
-                    sym % path);
-  }
-
-  (func)(state, v);
-
-  /* We don't dlclose because v may be a primop referencing a function in the
-   * shared object file */
-}
-
 /* Return a string representing the type of the expression. */
 static void prim_typeOf(EvalState& state, const Pos& pos, Value** args,
                         Value& v) {
@@ -2239,9 +2192,6 @@ void EvalState::createBaseEnv() {
   mkApp(v, *vScopedImport, *v2);
   forceValue(v);
   addConstant("import", v);
-  if (evalSettings.enableNativeCode) {
-    addPrimOp("__importNative", 2, prim_importNative);
-  }
   addPrimOp("__typeOf", 1, prim_typeOf);
   addPrimOp("isNull", 1, prim_isNull);
   addPrimOp("__isFunction", 1, prim_isFunction);
diff --git a/third_party/nix/src/libexpr/primops.hh b/third_party/nix/src/libexpr/primops.hh
index 388066f390..0c9f6ccab1 100644
--- a/third_party/nix/src/libexpr/primops.hh
+++ b/third_party/nix/src/libexpr/primops.hh
@@ -14,9 +14,4 @@ struct RegisterPrimOp {
   RegisterPrimOp(const std::string& name, size_t arity, PrimOpFun fun);
 };
 
-/* These primops are disabled without enableNativeCode */
-/* Load a ValueInitializer from a DSO and return whatever it initializes */
-void prim_importNative(EvalState& state, const Pos& pos, Value** args,
-                       Value& v);
-
 }  // namespace nix