Create `nix derivation add` command

Also refine `nix derivation show`'s docs very slightly.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/nix/derivation-add.cc b/src/nix/derivation-add.cc
new file mode 100644
index 000000000..4d91d4538
--- /dev/null
+++ b/src/nix/derivation-add.cc
@@ -0,0 +1,45 @@
+// FIXME: rename to 'nix plan add' or 'nix derivation add'?
+
+#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 CmdAddDerivation : MixDryRun, StoreCommand
+{
+    std::string description() override
+    {
+        return "Add a store derivation";
+    }
+
+    std::string doc() override
+    {
+        return
+          #include "derivation-add.md"
+          ;
+    }
+
+    Category category() override { return catUtility; }
+
+    void run(ref<Store> store) override
+    {
+        auto json = nlohmann::json::parse(drainFD(STDIN_FILENO));
+
+        auto drv = Derivation::fromJSON(*store, json);
+
+        auto drvPath = writeDerivation(*store, drv, NoRepair, /* read only */ dryRun);
+
+        drv.checkInvariants(*store, drvPath);
+
+        writeDerivation(*store, drv, NoRepair, dryRun);
+
+        logger->cout("%s", store->printStorePath(drvPath));
+    }
+};
+
+static auto rCmdAddDerivation = registerCommand2<CmdAddDerivation>({"derivation", "add"});