1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/nix/src/libmain/common-args.cc b/third_party/nix/src/libmain/common-args.cc
new file mode 100644
index 000000000000..3d9b8ebfaefd
--- /dev/null
+++ b/third_party/nix/src/libmain/common-args.cc
@@ -0,0 +1,42 @@
+#include "common-args.hh"
+
+#include <glog/logging.h>
+
+#include "globals.hh"
+
+namespace nix {
+
+MixCommonArgs::MixCommonArgs(const string& programName)
+    : programName(programName) {
+  mkFlag()
+      .longName("option")
+      .labels({"name", "value"})
+      .description("set a Nix configuration option (overriding nix.conf)")
+      .arity(2)
+      .handler([](std::vector<std::string> ss) {
+        try {
+          globalConfig.set(ss[0], ss[1]);
+        } catch (UsageError& e) {
+          LOG(WARNING) << e.what();
+        }
+      });
+
+  mkFlag()
+      .longName("max-jobs")
+      .shortName('j')
+      .label("jobs")
+      .description("maximum number of parallel builds")
+      .handler([=](const std::string& s) { settings.set("max-jobs", s); });
+
+  std::string cat = "config";
+  globalConfig.convertToArgs(*this, cat);
+
+  // Backward compatibility hack: nix-env already had a --system flag.
+  if (programName == "nix-env") {
+    longFlags.erase("system");
+  }
+
+  hiddenCategories.insert(cat);
+}
+
+}  // namespace nix