1 files changed, 64 insertions, 0 deletions
diff --git a/src/nix/derivation-show.cc b/src/nix/derivation-show.cc
new file mode 100644
index 000000000..bf637246d
--- /dev/null
+++ b/src/nix/derivation-show.cc
@@ -0,0 +1,64 @@
+// FIXME: integrate this with nix path-info?
+// FIXME: rename to 'nix store derivation show' or 'nix debug derivation show'?
+
+#include "command.hh"
+#include "common-args.hh"
+#include "store-api.hh"
+#include "archive.hh"
+#include "derivations.hh"
+#include <nlohmann/json.hpp>
+
+using namespace nix;
+using json = nlohmann::json;
+
+struct CmdShowDerivation : InstallablesCommand
+{
+    bool recursive = false;
+
+    CmdShowDerivation()
+    {
+        addFlag({
+            .longName = "recursive",
+            .shortName = 'r',
+            .description = "Include the dependencies of the specified derivations.",
+            .handler = {&recursive, true}
+        });
+    }
+
+    std::string description() override
+    {
+        return "show the contents of a store derivation";
+    }
+
+    std::string doc() override
+    {
+        return
+          #include "derivation-show.md"
+          ;
+    }
+
+    Category category() override { return catUtility; }
+
+    void run(ref<Store> store, Installables && installables) override
+    {
+        auto drvPaths = Installable::toDerivations(store, installables, true);
+
+        if (recursive) {
+            StorePathSet closure;
+            store->computeFSClosure(drvPaths, closure);
+            drvPaths = std::move(closure);
+        }
+
+        json jsonRoot = json::object();
+
+        for (auto & drvPath : drvPaths) {
+            if (!drvPath.isDerivation()) continue;
+
+            jsonRoot[store->printStorePath(drvPath)] =
+                store->readDerivation(drvPath).toJSON(*store);
+        }
+        logger->cout(jsonRoot.dump(2));
+    }
+};
+
+static auto rCmdShowDerivation = registerCommand2<CmdShowDerivation>({"derivation", "show"});